UNIONBANCAL CORP
S-3/A, 1999-01-11
NATIONAL COMMERCIAL BANKS
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<PAGE>
   
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JANUARY 11, 1999
    
   
     REGISTRATION NOS. 333-67581, 333-67581-01, 333-67581-02, 333-67581-03,
                                  333-67581-04
    
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
   
                                AMENDMENT NO. 1
                                       TO
                                    FORM S-3
    
 
                          REGISTRATION STATEMENT UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
 
<TABLE>
<S>                              <C>                            <C>
UNIONBANCAL CORPORATION                   CALIFORNIA               94-1234979
UNIONBANCAL FINANCE TRUST I                DELAWARE                94-3313816
UNIONBANCAL FINANCE TRUST II               DELAWARE                94-3313838
UNIONBANCAL FINANCE TRUST III              DELAWARE                94-3313845
UNIONBANCAL FINANCE TRUST IV               DELAWARE                94-3313846
(Exact name of Registrant as     (State or other jurisdiction   (I.R.S. Employer
specified in its charter)            of incorporation or         Identification
                                        organization)                 No.)
</TABLE>
 
                            ------------------------
 
                             350 CALIFORNIA STREET
                        SAN FRANCISCO, CALIFORNIA 94104
                                  415-765-2969
              (Address, Including Zip Code, and Telephone Number,
       Including Area Code, of Registrant's Principal Executive Offices)
                            ------------------------
 
                             JOHN H. MCGUCKIN, JR.
                            EXECUTIVE VICE PRESIDENT
                            UNIONBANCAL CORPORATION
                             400 CALIFORNIA STREET
                        SAN FRANCISCO, CALIFORNIA 94104
                                  415-765-2969
 (Name, Address, Including Zip Code, and Telephone Number, Including Area Code,
                             of Agents for Service)
 
                                    Copy to:
                                 GREGG A. NOEL
                    SKADDEN, ARPS, SLATE, MEAGHER & FLOM LLP
                             300 SOUTH GRAND AVENUE
                         LOS ANGELES, CALIFORNIA 90071
                                 (213) 687-5000
                            ------------------------
 
        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
   FROM TIME TO TIME AFTER THE EFFECTIVE DATE OF THIS REGISTRATION STATEMENT.
                            ------------------------
 
    If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, check the following
box.  / /
 
    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act,
other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box.  /X/
 
    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.  / /
 
    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  / /
 
    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box:  /X/
                            ------------------------
 
   
THE REGISTRANTS HEREBY AMEND THIS REGISTRATION STATEMENT ON SUCH DATE OR DATES
AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANTS SHALL FILE
A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION STATEMENT
SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF THE
SECURITIES ACT OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME EFFECTIVE ON
SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A), MAY
DETERMINE.
    
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
PROSPECTUS SUPPLEMENT ISSUED JANUARY 11, 1999 (SUBJECT TO COMPLETION)
(TO PROSPECTUS DATED                 , 1999)
THE INFORMATION IN THIS PROSPECTUS SUPPLEMENT IS NOT COMPLETE AND MAY BE
CHANGED. THIS PROSPECTUS SUPPLEMENT AND THE ACCOMPANYING PROSPECTUS ARE NOT AN
OFFER TO SELL THESE SECURITIES AND WE ARE NOT SOLICITING OFFERS TO BUY THESE
SECURITIES IN ANY STATE WHERE THE OFFER TO SELL IS NOT PERMITTED.
<PAGE>
                                  $-00,000,000
                          UNIONBANCAL FINANCE TRUST I
                                % CAPITAL SECURITIES
 
                 (LIQUIDATION AMOUNT $25 PER CAPITAL SECURITY)
                                 GUARANTEED BY
 
                            UNIONBANCAL CORPORATION
                                    --------
 UNIONBANCAL FINANCE TRUST I IS OFFERING CAPITAL SECURITIES GUARANTEED, TO THE
EXTENT DESCRIBED IN THIS PROSPECTUS SUPPLEMENT AND THE ACCOMPANYING PROSPECTUS,
                          BY UNIONBANCAL CORPORATION.
 
                              -------------------
 FOR A MORE DETAILED DESCRIPTION OF THE CAPITAL SECURITIES, SEE "DESCRIPTION OF
                THE CAPITAL SECURITIES" BEGINNING ON PAGE S-78.
 UNIONBANCAL FINANCE TRUST I HAS APPLIED TO LIST THE CAPITAL SECURITIES ON THE
             NEW YORK STOCK EXCHANGE UNDER THE TRADING SYMBOL "-".
 
                              -------------------
INVESTING IN THE CAPITAL SECURITIES INVOLVES RISKS. SEE "RISK FACTORS" BEGINNING
                                 ON PAGE S-13.
 
                              -------------------
 
<TABLE>
<CAPTION>
                                                                       UNDERWRITING
                                                  PRICE TO             DISCOUNTS AND           PROCEEDS TO
                                                   PUBLIC               COMMISSIONS               TRUST
                                            ---------------------  ---------------------  ---------------------
<S>                                         <C>                    <C>                    <C>
PER CAPITAL SECURITY......................           $25                 SEE BELOW                 $25
TOTAL.....................................            $                  SEE BELOW                  $
</TABLE>
 
    UNIONBANCAL FINANCE TRUST I WILL NOT PAY ANY UNDERWRITING COMMISSIONS.
UNIONBANCAL CORPORATION WILL PAY UNDERWRITING COMMISSIONS OF $         PER
CAPITAL SECURITY. ANY ACCUMULATED DISTRIBUTIONS FROM              , 1999 SHOULD
BE ADDED TO THE PRICE TO PUBLIC.
 
    THESE SECURITIES ARE NOT DEPOSITS OR OTHER OBLIGATIONS OF A BANK AND ARE NOT
INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION OR ANY OTHER GOVERNMENTAL
AGENCY.
 
    THE SECURITIES AND EXCHANGE COMMISSION AND STATE SECURITIES REGULATORS HAVE
NOT APPROVED OR DISAPPROVED THESE SECURITIES OR DETERMINED IF THIS PROSPECTUS
SUPPLEMENT OR THE ACCOMPANYING PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY
REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
    UNIONBANCAL FINANCE TRUST I HAS GRANTED THE UNDERWRITERS THE RIGHT TO
PURCHASE UP TO AN ADDITIONAL       CAPITAL SECURITIES TO COVER OVER-ALLOTMENTS.
THE ACTIVITIES OF THE UNDERWRITERS ARE LED JOINTLY IN THIS TRANSACTION BY MORGAN
STANLEY & CO. INCORPORATED AND SALOMON SMITH BARNEY INC. MORGAN STANLEY & CO.
INCORPORATED IS ACTING AS THE BOOKRUNNER FOR THE OFFERING OF THE CAPITAL
SECURITIES. THE UNDERWRITERS EXPECT TO DELIVER THE CAPITAL SECURITIES TO
PURCHASERS ON OR ABOUT              , 1999.
 
                              -------------------
 
MORGAN STANLEY DEAN WITTER                                  SALOMON SMITH BARNEY
 
             , 1999
<PAGE>
                        ABOUT THIS PROSPECTUS SUPPLEMENT
 
    You should read this prospectus supplement along with the prospectus that
follows. You should rely only on the information provided or incorporated by
reference in this prospectus supplement and the prospectus. We have not
authorized anyone else to provide you with different information. We are not
making an offer of the capital securities in any state where the offer is not
permitted. You should not assume that the information in this prospectus
supplement or the prospectus is accurate as of any date other than the dates on
the front of these documents.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
                            ------------------------
 
<TABLE>
<CAPTION>
             PROSPECTUS SUPPLEMENT
<S>                                              <C>
                                                 PAGE
                                                 ----
Prospectus Supplement Summary..................   S-3
 
Risk Factors...................................  S-13
 
UnionBanCal Finance Trust I....................  S-17
 
The Transactions...............................  S-18
 
Use of Proceeds................................  S-19
 
Capitalization.................................  S-20
 
Selected Consolidated Financial and Operating
  Data.........................................  S-21
 
Managements Discussion and Analysis of
  Financial Condition and Results of
  Operations...................................  S-25
 
Business.......................................  S-67
 
Accounting Treatment...........................  S-78
 
Description of the Capital Securities..........  S-78
 
Description of the Junior Subordinated
  Debentures...................................  S-92
 
Description of the Guarantee...................  S-98
 
Effect of Obligations Under the Junior
  Subordinated Debentures and the Guarantee....  S-102
 
Certain United States Federal Income Tax
  Consequences.................................  S-103
 
Certain ERISA Considerations...................  S-105
 
Underwriters...................................  S-108
 
Legal Matters..................................  S-109
 
Index to Financial Statements..................   F-1
                     PROSPECTUS
                                                 PAGE
                                                 ----
About This Prospectus..........................     2
 
Special Note Regarding Forward-Looking
  Statements...................................     2
 
UnionBanCal Corporation........................
 
Risk Factors...................................     4
 
The Trusts.....................................     8
 
Use of Proceeds................................     9
 
Ratio of Earnings to Combined Fixed Charges and
  Preferred Stock Dividends....................     9
 
Description of Securities......................    10
 
  Description of Capital Stock.................    10
 
  Description of Depositary Shares.............    11
 
  Description of the Trust Preferred
    Securities.................................    13
 
  Description of Debt Securities...............    19
 
  Description of the Trust Preferred Securities
    Guarantees.................................    28
 
Relationship Among the Trust Preferred
  Securities, the Trust Preferred Securities
  Guarantee and the Debt Securities Held by
  Each Trust...................................    31
 
Plan of Distribution...........................    31
 
Legal Opinion..................................    32
 
Experts........................................    32
 
Where You Can Find More Information............    33
</TABLE>
 
                                      S-2
<PAGE>
                         PROSPECTUS SUPPLEMENT SUMMARY
 
    YOU SHOULD READ THE INFORMATION CONTAINED IN THIS PROSPECTUS SUPPLEMENT
CONCERNING UNIONBANCAL CORPORATION, OR "UNBC," "WE" OR "US," UNIONBANCAL FINANCE
TRUST I, OR "FINANCE TRUST I," THE     % CAPITAL SECURITIES TO BE ISSUED BY
FINANCE TRUST I, THE GUARANTEE TO BE ISSUED BY US WITH RESPECT TO FINANCE TRUST
I AND THE     % JUNIOR SUBORDINATED DEFERRABLE INTEREST DEBENTURES TO BE ISSUED
BY US, WITH THE INFORMATION CONTAINED IN THE ACCOMPANYING PROSPECTUS.
 
                            UNIONBANCAL CORPORATION
 
    UNBC is a California-based commercial bank holding company. Its principal
subsidiary is Union Bank of California, N.A. Union Bank of California is the
third largest commercial bank in California, based on both total assets and
total deposits in California, and is among the 30 largest in the United States.
Having roots as far back as 1864, we are among the oldest banks on the West
Coast. At September 30, 1998, we had 244 full-service branches in California,
six full-service branches in Oregon and Washington, two facilities in Texas and
New York and 18 offices abroad. Most of our customers are located in California,
the nation's most populous state with over 32 million residents. Our bank was
formed through the combination of Union Bank and BanCal Tri-State Corporation in
1996. We are presently approximately 82% owned by The Bank of Tokyo-Mitsubishi,
Ltd.
 
    We provide a wide range of financial products and services to retail
customers, small businesses, middle-market companies and major corporations.
These products and services include a variety of personal and commercial
financial services, including:
 
    - consumer and small-business lending,
 
    - corporate and international lending,
 
    - corporate and international cash management,
 
    - treasury,
 
    - trust services, and
 
    - investment advisory services.
 
    As of September 30, 1998, we had total assets of $31.4 billion, total
deposits of $23.7 billion and total shareholders' equity of $3.0 billion. We had
net income for the nine months ended September 30, 1998 of $352.4 million, and
net income per diluted share of $2.01 after giving effect to the December 1998
3-for-1 stock split described below.
 
THE STRATEGIC REPOSITIONING
 
    THE TRANSACTIONS.  We are seeking to repurchase shares of our common stock
from two of our existing shareholders. We expect to repurchase $250 million in
shares of our common stock from The Bank of Tokyo-Mitsubishi, concurrently with
the closing of a $750 million offering of our common stock by The Bank of
Tokyo-Mitsubishi. We expect to repurchase the shares at the public offering
price in the common stock offering, less the underwriting discounts and
commissions. In addition, we are currently negotiating with another foreign
institutional shareholder regarding the repurchase of approximately 2.1 million
shares of our common stock. Two other foreign institutional shareholders decided
not to participate in the repurchase. We intend to use the net proceeds of this
offering of capital securities to finance both of the repurchases. This
offering, the repurchases and the common stock offering are referred to in this
prospectus as the "Transactions." We anticipate that this offering and the
common stock offering will close in the first quarter of 1999.
 
    From UNBC's point of view, the Transactions are principally designed to
improve our return on average common equity and earnings per share and to
increase our public float. In addition, the sale of common stock by The Bank of
Tokyo-Mitsubishi to the public will raise proceeds for, and enhance the capital
base of, The Bank of Tokyo-Mitsubishi.
 
                                      S-3
<PAGE>
    The repurchase of the common stock from The Bank of Tokyo-Mitsubishi and the
issuance of the capital securities would, on a pro forma basis:
 
    - increase UNBC's return on average common equity from 16.87% to    % at
      September 30, 1998; and
 
    - increase UNBC's diluted earnings per share for the year ended December 31,
      1997 and nine months ended September 30, 1998 from $2.30 up to $   , and
      from $2.01 up to $   , respectively, representing an approximate    %
      increase and an approximate    % increase, respectively.
 
    The sale of the common stock by The Bank of Tokyo-Mitsubishi to the public
will also substantially increase the percentage of UNBC's common stock held by
public investors. This increase in public shareholders will increase our common
stock's float. The Bank of Tokyo-Mitsubishi currently owns 81.6% of our common
stock and will own    % after the Transactions.
 
    We believe the Transactions will provide UNBC with additional benefits. The
Transactions should increase our market visibility as a result of more research
coverage and should make our common stock a more attractive acquisition
currency. The Transactions will not result in a material change to our Tier 1
risk-based capital ratio, our total risk-based capital ratio or our leverage
ratio.
 
    DIVIDEND POLICY AND STOCK SPLIT.  On November 19, 1998, we announced a
3-for-1 common stock split, which became effective in December 1998, and a 36%
increase in our quarterly common stock dividend for the fourth quarter of 1998
from $0.14 per share to $0.19 per share after giving effect to the stock split.
 
BANKING SERVICES
 
    UNBC's operations are divided into four primary segments:
 
    THE COMMUNITY BANKING GROUP.  This group provides its customers with a full
line of checking and savings, investment, loan and fee-based banking products.
It has 244 branches in California, as well as six branches in Oregon and
Washington. It also has the fifth largest branch network among depository
institutions in California. It competes with larger banks by providing service
quality superior to that of its major competitors and is recognized as among the
highest rated banks in California for customer service quality. For the nine
months ended September 30, 1998, average assets in this group were $10.3
billion, and average deposits were $12.3 billion.
 
    THE COMMERCIAL FINANCIAL SERVICES GROUP.  This group offers a variety of
commercial financial services, including commercial and project loans, real
estate financing, asset-based and leveraged commercial financing, trade finance
and letters of credit, lease financing, customized cash management services and
selected capital markets products. The group's customers include middle-market
companies, large corporations, real estate companies and other more specialized
industry customers. This group competes with other banks primarily on the basis
of its reputation as a "business bank," the quality of its relationship
managers, and the delivery of superior customer service. For the nine months
ended September 30, 1998, average assets in this group were $12.0 billion, and
average deposits were $5.8 billion.
 
    THE TRUST & PRIVATE FINANCIAL SERVICES GROUP.  This group offers investment
management and administration services for a broad range of individuals and
institutions. It services individual client needs through its trust and private
banking, investment management and brokerage products and services. It services
institutional client needs through traditional employee benefit and 401(k)
programs, global and domestic securities custody, securities lending and
corporate trust products. The group also provides investment management services
for both individual and institutional clients through HighMark Capital
Management, Inc. and its family of proprietary HighMark mutual funds. As of
September 30, 1998, this group had over $90 billion in assets under
administration.
 
                                      S-4
<PAGE>
    THE INTERNATIONAL BANKING GROUP.  This group primarily provides
correspondent banking and trade finance-related products and services to
financial institutions worldwide, including Brazil, Hong Kong, Japan, Korea and
Taiwan. It also serves selected foreign firms and U.S. corporate clients in
selected countries worldwide, particularly in Asia. This group has a long and
stable history of providing correspondent and trade-related services to
international financial institutions. In light of recent volatility in global
markets, we have reduced our credit exposure and the average maturity of this
portfolio. UNBC reduced cross border outstandings to Japan, Korea, Malaysia,
Thailand, Vietnam, Singapore, Indonesia, the Philippines, China and Hong Kong by
$1 billion to $1.6 billion at September 30, 1998 compared to $2.6 billion at
December 31, 1997. A large part of the outstandings are related to this group.
For the nine months ended September 30, 1998, average assets in this group were
$2.1 billion, and average deposits were $864 million, in each case excluding
inter-company placements and overnight inter-bank loans, consisting primarily of
export/import related short-term trade transactions.
 
OPERATING STRATEGY
 
    We focus our strategy on the following:
 
    - CAPITALIZE ON STRONG POSITION IN CORE CALIFORNIA MARKET. California is the
      largest state in the United States, with over 32 million residents and
      nearly $1 trillion in gross state product. Based on both total assets and
      total deposits in California, we are the third largest commercial bank in
      California, and we are among the oldest banks on the West Coast.
 
    - STRENGTHEN CONSUMER BANKING FRANCHISE. We offer a distinctive combination
      of traditional community bank service with a large branch network and a
      broad array of products. We are seeking to increase the number of consumer
      households we serve, and we are simultaneously broadening the range of
      financial products and services we provide to existing customers.
 
    - FOCUS COMMERCIAL BANKING EFFORTS ON SPECIFIC INDUSTRIES AND COMPANIES. We
      target our commercial banking activities on industries and companies for
      which we can reasonably expect to be one of a customer's principal banks.
      Our emphasis is on relationship management and meeting a large part of our
      targeted customers' credit and depository needs.
 
    - DIVERSIFY REVENUE SOURCES AND EXPAND FEE-BASED BUSINESS. We are seeking to
      diversify our revenue sources by expanding our fee-based businesses, with
      a particular emphasis on our trust and asset management businesses.
 
    - EMPHASIZE QUALITY CUSTOMER SERVICE. We seek to continue to provide highly
      responsive customer service to create and maintain long-term relationships
      with clients who are often underserved by larger banks.
 
    - MAINTAIN HIGH LENDING STANDARDS AND STRONG ASSET QUALITY PROFILE. We
      strive to maintain strong asset quality through our underwriting
      standards, credit policies and ongoing credit reviews of our existing loan
      portfolio. At September 30, 1998, our ratio of non-performing assets to
      total assets was 0.26%, or the seventh lowest of the 30 largest commercial
      banks in the United States.
 
    - IDENTIFY STRATEGIC BUSINESSES AND CONSIDER POTENTIAL ACQUISITIONS OR
      DIVESTITURES. We view selective acquisitions and divestitures, as well as
      internal growth, as the primary means to increase and enhance our core
      businesses.
 
    - IMPROVE OPERATING EFFICIENCY.
 
    - ATTAIN NEW FINANCIAL PERFORMANCE TARGETS.
 
                            ------------------------
 
    Our principal executive offices are located at 350 California Street, San
Francisco, California, 94104, and our telephone number is (415) 765-2969.
 
                                      S-5
<PAGE>
                          UNIONBANCAL FINANCE TRUST I
 
    Finance Trust I is a Delaware business trust. Finance Trust I will exist
solely to:
 
    - issue and sell its common securities to us;
 
    - issue and sell its capital securities to the public;
 
    - use the proceeds from the sale of its common securities and capital
      securities to purchase the junior subordinated debentures from us; and
 
    - engage in other activities that are necessary or incidental to these
      purposes.
 
    Five trustees will manage Finance Trust I. Three of the trustees, all of
which are regular trustees, are our officers. The First National Bank of Chicago
will act as the property trustee of Finance Trust I and First Chicago Delaware
Inc. will act as the Delaware trustee of Finance Trust I. The principal offices
and telephone number of Finance Trust I are the same as ours.
 
                                  THE OFFERING
 
    Finance Trust I is offering its capital securities at a price of $25 for
each security. Finance Trust I will use all of the proceeds from the sale of its
capital securities and its common securities to purchase the junior subordinated
debentures from us. Our junior subordinated debentures will be the only assets
of Finance Trust I. We will guarantee the obligations of Finance Trust I under
the capital securities and the common securities to the extent described in this
prospectus supplement.
 
    THE CAPITAL SECURITIES
 
    If you purchase capital securities, you will be entitled to receive
cumulative cash distributions at an annual rate of     % of the liquidation
amount of $25 per capital security. Distributions will accumulate from the date
Finance Trust I issues its capital securities. Finance Trust I will pay the
distributions quarterly in arrears on         ,         ,         and         of
each year, beginning             , 1999, although these distributions may be
deferred as described in this prospectus supplement. Finance Trust I will only
pay distributions when it has funds available for payment.
 
    If you purchase the capital securities, you will have limited voting rights.
You will be entitled to vote only with respect to two matters: certain
modifications to the terms of the capital securities and the exercise of Finance
Trust I's rights as holder of our junior subordinated debentures.
 
    THE COMMON SECURITIES
 
    We will acquire all of the common securities of Finance Trust I. The common
securities will have an aggregate liquidation amount equal to approximately 3%
of the total capital of Finance Trust I. The common securities will generally
rank on par with the capital securities in priority of payment. In the case of
certain defaults, however, the common securities will rank junior to the capital
securities with respect to distributions, redemption and liquidation. Except in
certain limited circumstances, the common securities will have sole voting power
with respect to matters to be voted upon by Finance Trust I's security holders.
 
    THE JUNIOR SUBORDINATED DEBENTURES
 
    Finance Trust I will purchase the junior subordinated debentures from us
with the proceeds from the sale of its capital securities and its common
securities. The junior subordinated debentures will be issued under an indenture
between us and The First National Bank of Chicago, as trustee. The junior
subordinated debentures will:
 
    - be unsecured and subordinate to all of our senior indebtedness, including
      debt we incur after the date you purchase the capital securities;
 
                                      S-6
<PAGE>
    - have an aggregate principal amount equal to the aggregate liquidation
      amount of the capital securities plus the capital contributed by us for
      the common securities;
 
    - bear interest at a rate of     % per annum; and
 
    - mature on             , 20 - , although they may be redeemed earlier.
 
    GUARANTEE OF THE CAPITAL SECURITIES
 
    We will guarantee the capital securities pursuant to the terms of a
guarantee.
 
    The guarantee requires us to pay accrued and unpaid distributions on the
capital securities only to the extent that we have made a payment of interest or
principal on the junior subordinated debentures. It does not, however, require
us to make payments on behalf of Finance Trust I if Finance Trust I does not
have sufficient funds to make payments on the capital securities because we have
not made payments on the junior subordinated debentures. Our obligations under
the guarantee are subordinate to our obligations to make payments on all of our
other liabilities (except our obligations under similar guarantees).
 
    RANKING
 
    Finance Trust I's capital securities will generally rank on par with its
common securities in priority of payment. Finance Trust I will make payments on
the capital securities and the common securities on a PRO RATA basis, except in
certain circumstances (described on page S- - ).
 
    The junior subordinated debentures will be unsecured and will rank
subordinate and junior in right of payment to all of our current and future
senior indebtedness. The junior subordinated debentures will rank on a par with
any other junior subordinated debentures that we may issue.
 
    The guarantee will rank on par with any other guarantees that we may issue
with respect to capital securities issued by trusts similar to Finance Trust I.
The guarantee will be unsecured and will rank subordinate and junior in right of
payment to all of our other liabilities. The junior subordinated debentures and
the guarantee will be effectively subordinated to all existing and future
liabilities of our subsidiaries and affiliates.
 
    DEFERRAL OF DISTRIBUTIONS
 
    We can defer interest payments on the junior subordinated debentures during
a period of up to 20 consecutive quarters (but not beyond the maturity date)
unless we are in default in the payment of interest on the junior subordinated
debentures. After we make all interest payments that we have deferred, including
accrued interest on the deferred payments, we can again defer interest payments
during new periods of up to 20 consecutive quarters as long we adhere to the
same requirements.
 
    If we defer interest payments on the junior subordinated debentures, Finance
Trust I will defer distributions on the capital securities. During any deferral
period, distributions will continue to accumulate on the capital securities at
an annual rate of     % of the liquidation amount of $25 per capital security.
Also, the deferred distributions will accrue interest at an annual rate of
    %.
 
    During any period in which we defer interest payments on the junior
subordinated debentures, we will generally not be permitted to:
 
    - pay dividends or make any other distributions on our capital stock;
 
    - redeem, purchase or make liquidation payments on any of our capital stock;
      or
 
    - make an interest, principal or premium payment, or repurchase or redeem,
      any of our debt securities that rank equal with or junior to the junior
      subordinated debentures or the guarantee, including any other similar
      junior subordinated debentures and guarantees issued by us.
 
                                      S-7
<PAGE>
    If we defer payments of interest on the junior subordinated debentures, the
capital securities would at that time be treated as being issued with original
issue discount for United States federal income tax purposes. This means that
you would be required to recognize interest income with respect to deferred
distributions and include such amounts in your gross income for United States
federal income tax purposes before you receive any cash distributions. This is
more fully explained in "Certain United States Federal Income Tax Consequences"
beginning on page S- - .
 
    REDEMPTION OF CAPITAL SECURITIES
 
    Finance Trust I will redeem all of the outstanding capital securities when
we redeem the junior subordinated debentures at maturity on             , 20 - .
In addition, if we redeem any junior subordinated debentures before their
maturity, Finance Trust I will use the cash it receives on the redemption of the
junior subordinated debentures to redeem an equal amount of the capital
securities and common securities on a PRO RATA basis.
 
    We can redeem some or all of the junior subordinated debentures before their
maturity at 100% of their principal amount:
 
    - on one or more occasions any time on or after             , 2004; and
 
    - before             , 2004, if certain changes in tax, investment company
      or bank regulatory law occur (as more fully described on page S- - ).
 
    In either case, we will pay accrued interest to the date of redemption.
 
    DISTRIBUTION OF THE JUNIOR SUBORDINATED DEBENTURES
 
    We have the right to dissolve Finance Trust I at any time. If we decide to
exercise our right to dissolve Finance Trust I, Finance Trust I will redeem the
capital securities by distributing the junior subordinated debentures to holders
of the capital securities and the common securities on a PRO RATA basis. If the
junior subordinated debentures are distributed, we will use our best efforts to
list the junior subordinated debentures on the New York Stock Exchange (or any
other exchange on which the capital securities are then listed) in place of the
capital securities. For a discussion of our ability to distribute the junior
subordinated debentures, see "Description of the Capital Securities--Liquidation
Distribution Upon Dissolution" below.
 
    CONDITIONAL RIGHT TO SHORTEN MATURITY
 
    If certain changes in tax law occur, we will have the right prior to the
dissolution of Finance Trust I to shorten the maturity of the junior
subordinated debentures. We may only shorten the maturity to the extent
necessary so that the interest paid on the junior subordinated debentures will
continue to be tax deductible. The shortened term of the junior subordinated
debentures may not be less than 15 years from the date of their original
issuance.
 
    USE OF PROCEEDS
 
    Finance Trust I will invest all of the proceeds from the sale of the capital
securities in the junior subordinated debentures. We intend to use the net
proceeds from the sale of the junior subordinated debentures to repurchase $250
million of our common stock from our majority shareholder, The Bank of
Tokyo-Mitsubishi, Ltd., and 2.1 million shares of our common stock from another
foreign institutional shareholder. Pending such use, we will invest the net
proceeds temporarily in   -  .
 
                                      S-8
<PAGE>
    LISTING OF THE CAPITAL SECURITIES
 
    Finance Trust I has applied to have the capital securities listed on the New
York Stock Exchange under the symbol " - ". You should be aware that the listing
of the capital securities will not necessarily ensure that a liquid trading
market will be available for the capital securities.
 
    RISK FACTORS
 
    Your investment in the capital securities will involve certain risks. You
should carefully consider the following discussion of risks, and the other
information in this prospectus supplement and the accompanying prospectus,
before deciding whether an investment in the capital securities is suitable for
you.
 
    FORM OF CAPITAL SECURITIES
 
    The capital securities will be represented by one or more global securities
that will be deposited with and registered in the name of The Depository Trust
Company or its nominee. This means that you will not receive a certificate for
your capital securities and that your broker will maintain your position in the
capital securities.
 
                                      S-9
<PAGE>
               SUMMARY CONSOLIDATED FINANCIAL AND OPERATING DATA
 
    The summary financial and other data as of December 31, 1996 and 1997 and
for the years ended December 31, 1995, 1996 and 1997 are derived from our
audited consolidated financial statements included in this prospectus. The
summary financial and other data as of December 31, 1995 is derived from our
audited consolidated financial statements that are not included in this
prospectus. The summary financial and other data as of September 30, 1997 and
1998 and for the nine-month periods ended September 30, 1997 and 1998 are
derived from our unaudited consolidated financial statements included in this
prospectus, which, in the opinion of our management, include all adjustments
necessary for a fair presentation of our financial position at such date and the
results of operations for such interim period. The results for the nine-month
period ended September 30, 1998 are not necessarily indicative of the results to
be expected of the full fiscal year. You should read the following data with the
more detailed information contained in "Selected Consolidated Financial and
Operating Data," "Management's Discussion and Analysis of Financial Condition
and Results of Operations" and our consolidated financial statements and the
notes to the consolidated financial statements, each included in this
prospectus.
 
                                      S-10
<PAGE>
 
<TABLE>
<CAPTION>
                                                                                        NINE MONTHS ENDED
                                                     YEAR ENDED DECEMBER 31,              SEPTEMBER 30,
                                              -------------------------------------  ------------------------
                                                 1995         1996         1997         1997         1998
                                              -----------  -----------  -----------  -----------  -----------
                                                       (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                           <C>          <C>          <C>          <C>          <C>
RESULTS OF OPERATIONS:
  Net interest income(1)....................  $ 1,152,777  $ 1,175,302  $ 1,237,010  $   917,408  $   983,056
  Provision for credit losses...............       53,250       40,000      --           --            45,000
  Noninterest income........................      395,319      418,676      463,001      342,627      399,949
  Noninterest expense(2)....................      978,101    1,134,904    1,044,665      762,208      836,178
                                              -----------  -----------  -----------  -----------  -----------
  Income before income taxes(1).............      516,745      419,074      655,346      497,827      501,827
  Taxable-equivalent adjustment.............       10,444        6,724        5,328        4,107        3,417
  Income tax expense........................      193,359      162,892      238,722      174,869      146,045
                                              -----------  -----------  -----------  -----------  -----------
  Net income................................  $   312,942  $   249,458  $   411,296  $   318,851  $   352,365
                                              -----------  -----------  -----------  -----------  -----------
                                              -----------  -----------  -----------  -----------  -----------
NET INCOME APPLICABLE TO COMMON STOCK.......  $   301,637  $   238,152  $   403,696  $   311,251  $   352,365
                                              -----------  -----------  -----------  -----------  -----------
                                              -----------  -----------  -----------  -----------  -----------
PER COMMON SHARE:(3)
  Net income -- basic(4)....................  $      1.74  $      1.37  $      2.31  $      1.78  $      2.01
  Net income -- diluted(4)..................         1.73         1.36         2.30         1.78         2.01
  Pro forma earnings -- basic, excluding
    after tax merger and integration expense
    and cumulative effect of accounting
    change(2)...............................         1.74         1.78         2.33         1.80         2.01
  Pro forma earnings -- diluted, excluding
    after tax merger and integration expense
    and cumulative effect of accounting
    change(2)...............................         1.73         1.77         2.32         1.80         2.01
  Dividends(5)..............................         0.47         0.47         0.51         0.37         0.42
  Book value (end of period)(6).............        13.49        13.53        15.32        14.96        17.04
  Common shares outstanding (end of
  period)...................................  174,180,493  174,457,603  174,917,674  174,848,461  175,208,037
  Weighted average common shares outstanding
    -- basic................................  173,806,300  174,391,048  174,683,338  174,614,764  175,090,890
  Weighted average common shares outstanding
    -- diluted..............................  174,099,241  174,783,565  175,189,078  175,071,292  175,728,849
BALANCE SHEET DATA (END OF PERIOD):
  Total assets..............................  $27,546,859  $29,234,059  $30,585,265  $30,982,479  $31,407,318
  Total loans...............................   20,431,683   21,049,787   22,741,408   22,297,724   23,497,845
  Nonperforming assets......................      246,871      156,784      129,809      132,974       81,399
  Total deposits............................   19,655,043   21,532,960   23,296,374   22,974,188   23,663,129
  Common equity.............................    2,349,092    2,359,933    2,679,299    2,615,327    2,984,950
BALANCE SHEET DATA (PERIOD AVERAGE):
  Total assets..............................  $25,564,843  $27,899,734  $29,692,992  $29,451,728  $30,130,893
  Total loans...............................   18,974,540   20,727,577   21,855,911   21,693,329   22,916,992
  Earning assets............................   22,849,129   24,717,326   26,291,822   26,066,274   27,002,879
  Total deposits............................   17,969,972   20,101,544   22,067,155   21,823,524   22,386,160
  Common equity.............................    2,197,476    2,325,437    2,514,610    2,469,521    2,792,727
OTHER DATA:
  Return on average assets(7)...............         1.22%        0.89%        1.39%        1.45%        1.56%
  Pro forma return on average assets,
    excluding after-tax merger and
    integration expense and cumulative
    effect of accounting change(2)(7).......         1.22         1.15         1.40         1.46         1.56
  Return on average common equity, excluding
    after-tax merger and integration expense
    and cumulative effect of accounting
    change(2)(8)............................        13.73        10.24        16.05        16.85        16.87
  Pro forma return on average common
    equity(2)(8)............................        13.73        13.33        16.20        17.04        16.87
  Efficiency ratio(9).......................        63.39        71.02        61.53        60.55        60.51
  Pro forma efficiency ratio, excluding
    merger and integration expense(2)(9)....        63.39        63.65        61.17        60.07        60.51
  Net interest margin(10)...................         5.05         4.75         4.70         4.70         4.86
  Tier 1 risk-based capital ratio(11).......         9.35         9.08         8.96         8.92         9.53
  Total risk-based capital ratio(12)........        11.70        11.17        11.05        11.02        11.51
</TABLE>
 
- --------------------------
(1) Amounts are on a taxable-equivalent basis using the federal statutory tax
    rate of 35 percent.
 
(2) Merger and integration expense was $117 million and $6 million for December
    31, 1996 and 1997, respectively, and after-tax merger and integration
    expense was $72 million and $4 million for December 31, 1996 and 1997,
    respectively. Merger and integration expense was $6 million ($4 million
    after-tax) for the nine-months ended September 30, 1997. See page S-44 "Year
    Ended December 31, 1997 compared to Year Ended December 31, 1996" for a
    description of merger accounting and pro forma presentations.
 
                                      S-11
<PAGE>
(3) Amounts have been restated to give retroactive effect to the December 1998
    3-for-1 stock split.
 
(4) Basic and diluted earnings per share is computed by dividing net income
    applicable to common stock by the weighted average number of common shares
    outstanding during the period. Diluted earnings per share incorporate the
    dilutive effects of outstanding stock options.
 
(5) Dividends per share reflect dividends declared on UNBC's common stock
    outstanding as of the declaration date. Amounts prior to the merger on April
    1, 1996 are based on Union Bank only and do not include the dividend of $145
    million paid to The Mitsubishi Bank, Limited in the first quarter of 1996 by
    BanCal Tri-State Corporation and The Bank of California, N.A.
 
(6) Book value per share is computed by dividing the common equity at the end of
    the period by the number of common shares outstanding at the end of the
    period.
 
(7) Return on average assets is computed by dividing net income by the average
    assets for the period. Net income for the nine months ended September 30,
    1997 and 1998 has been annualized.
 
(8) Return on average common equity is computed by dividing net income
    applicable to common stock by average common equity for the period. Net
    income for the nine months ended September 30, 1997 and 1998 has been
    annualized.
 
(9) The efficiency ratio is noninterest expense, excluding foreclosed asset
    expense (income), as a percentage of net interest income
    (taxable-equivalent) and noninterest income. Foreclosed asset expense
    (income) was $(3.2) million, $2.9 million and $(1.3) million for the years
    ended 1995 through 1997, respectively. For the nine months ended September
    30, 1997 and 1998, foreclosed asset expense (income) was $(0.7) million in
    each period.
 
(10) The net interest margin is computed by dividing net interest income
    (taxable-equivalent) by average earning assets for the period. Net interest
    income (taxable-equivalent) for the nine months ended September 30, 1997 and
    1998 has been annualized.
 
(11) The Tier 1 risk-based capital ratio is computed by dividing Tier 1 capital
    (common and preferred equity, less certain intangible assets) by risk
    weighted period-end assets.
 
(12) The total risk-based capital ratio was computed by dividing total capital
    (Tier 1 capital, subordinated debt, and a limited amount of the allowance
    for credit losses) by risk-weighted period-end assets (excluding certain
    intangible assets).
 
                                      S-12
<PAGE>
                                  RISK FACTORS
 
    AN INVESTMENT IN THE CAPITAL SECURITIES INVOLVES A NUMBER OF RISKS. YOU
SHOULD CAREFULLY CONSIDER THE FOLLOWING INFORMATION, TOGETHER WITH THE OTHER
INFORMATION IN THIS PROSPECTUS SUPPLEMENT, THE ACCOMPANYING PROSPECTUS AND THE
DOCUMENTS THAT ARE INCORPORATED BY REFERENCE IN THE PROSPECTUS, ABOUT RISKS
CONCERNING THE CAPITAL SECURITIES, BEFORE BUYING ANY CAPITAL SECURITIES.
 
    BECAUSE FINANCE TRUST I WILL RELY ON THE PAYMENTS IT RECEIVES ON THE JUNIOR
SUBORDINATED DEBENTURES TO FUND ALL PAYMENTS ON THE CAPITAL SECURITIES, AND
BECAUSE FINANCE TRUST I MAY DISTRIBUTE THE JUNIOR SUBORDINATED DEBENTURES IN
EXCHANGE FOR THE CAPITAL SECURITIES, YOU ARE MAKING AN INVESTMENT DECISION WITH
REGARD TO THE JUNIOR SUBORDINATED DEBENTURES AS WELL AS THE CAPITAL SECURITIES.
YOU SHOULD CAREFULLY REVIEW THE INFORMATION IN THIS PROSPECTUS SUPPLEMENT AND
THE ACCOMPANYING PROSPECTUS ABOUT BOTH OF THESE SECURITIES AND THE GUARANTEE.
 
UNBC'S OBLIGATIONS UNDER THE GUARANTEE AND THE JUNIOR SUBORDINATED DEBENTURES
  WILL BE SUBORDINATED
 
    UNBC's obligations under the guarantee are unsecured and rank (1)
subordinate and junior in right of payment to all of its other liabilities
(unless such liabilities are made equal to the guarantee expressly by their
terms) and (2) equal to the most senior preferred or preference stock that it
may issue. UNBC's obligations under the junior subordinated debentures are
unsecured and rank subordinate and junior in right of payment to all of its
present and future senior indebtedness and rank equal to UNBC's obligations to
other junior debt securities. As of September 30, 1998, UNBC had approximately
$  -  million of senior indebtedness. The junior subordinated debentures also
will be effectively subordinated to all obligations of UNBC's subsidiaries.
Nothing in the capital securities, the junior subordinated debentures or the
guarantee limits UNBC's ability to incur additional indebtedness, including
indebtedness that ranks senior to the junior subordinated debentures and the
guarantee. See "Description of the Guarantee" and "Description of the Junior
Subordinated Debentures--Subordination" below.
 
RIGHTS UNDER THE GUARANTEE; DIRECT ACTION
 
    The ability of Finance Trust I to timely pay amounts due on the capital
securities is solely dependent upon UNBC making the related payments on the
junior subordinated debentures when due. If UNBC defaults on its obligations to
pay principal of or interest on the junior subordinated debentures, Finance
Trust I will not have sufficient funds to pay distributions on or the
liquidation amount of the capital securities. As a result, you will not be able
to rely upon the guarantee for payment of these amounts. Instead, you or the
property trustee will need to enforce the rights of Finance Trust I under the
junior subordinated debentures directly against UNBC. See "Effect of Obligations
under the Junior Subordinated Debentures and the Guarantee" below.
 
    The holders of not less than a majority in aggregate liquidation amount of
the capital securities have the right to direct the time, method and place of
conducting any proceeding for any remedy available to the trustee under the
guarantee or to direct the exercise of any trust power that the trustee has
under the guarantee. Any holder of the capital securities may institute a legal
proceeding against UNBC, as the issuer of the guarantee, to enforce its rights
under the guarantee without first instituting a legal proceeding against UNBC as
issuer of the junior subordinated debentures or against any other person or
entity. As described in the preceding paragraph, if UNBC were in default of its
obligation to make payments under the junior subordinated debentures, Finance
Trust I would not have funds to make payments on the capital securities and you
would not be able to rely on the guarantee for payment. Instead, if UNBC were in
such a default, holders of capital securities or the property trustee could
institute a legal proceeding directly against UNBC for enforcement of payment to
such holders of capital securities of the payments on the junior subordinated
debentures having a principal amount equal to the aggregate liquidation amount
of the capital securities held by such holders. Except as noted, holders of
capital securities will not be able to exercise directly any other remedy
available to the holders of the junior subordinated debentures or assert
 
                                      S-13
<PAGE>
directly any other rights in respect of the junior subordinated debentures. See
"Description of the Capital Securities--Voting Rights," "Description of Junior
Subordinated Debentures--Enforcement of Certain Rights by Holders of Capital
Securities" and "Effect of Obligations under the Junior Subordinated Debentures
and the Guarantee" below.
 
DISTRIBUTIONS ON THE CAPITAL SECURITIES COULD BE DEFERRED FOR UP TO FIVE YEARS,
  BUT HOLDERS WOULD STILL RECOGNIZE INCOME FOR TAX PURPOSES
 
    As long as UNBC is not in default on the payment of interest on the junior
subordinated debentures, UNBC has the right under the indenture to defer
interest payments on the junior subordinated debentures for any period up to 20
consecutive quarters, but not beyond the stated maturity of the junior
subordinated debentures. During each such extension period, Finance Trust I will
defer payments of distributions on the capital securities in a corresponding
amount. There is no limit on the number of extension periods that may begin, as
long as UNBC is not in default in the payment of interest on the junior
subordinated debentures. See "Description of the Capital
Securities--Distributions" and "Description of the Junior Subordinated
Debentures--Option to Extend Interest Payment Period" below.
 
    If an extension period occurs, each holder of capital securities (even if it
uses the cash method of tax accounting) will be required to accrue income (in
the form of original issue discount) for United States federal income tax
purposes with respect to its proportionate share of the deferred interest on the
junior subordinated debentures. As a result, you would be required to include
such income in gross income for United States federal income tax purposes before
you actually received any cash attributable to that income. In addition, you
would not receive the cash related to such income from Finance Trust I if you
disposed of your capital securities prior to the record date for any
distribution date on which such deferred distribution is paid, even if you held
the capital securities on the date that the payments would normally be made.
 
    Although UNBC has no current intention of exercising its right to defer
payments of interest by extending the interest payment period on the junior
subordinated debentures, the market price of the capital securities may be
adversely affected if UNBC exercises this right in the future. See "--General
Market Conditions and Deferral Rights Could Adversely Affect Market Prices,"
"Certain United States Federal Income Tax Consequences--Potential Extension of
Interest Payment Period and Original Issue Discount" and "--Sale of Capital
Securities" below.
 
THE CAPITAL SECURITIES MAY BE REDEEMED IF CERTAIN TAX OR REGULATORY EVENTS OCCUR
 
    If certain changes in tax, investment company or bank regulatory law occur
and are continuing, and certain other conditions are satisfied, UNBC has the
right to redeem the junior subordinated debentures in whole (but not in part)
within 90 days following the occurrence of such event. If the junior
subordinated debentures are redeemed, the capital securities must be redeemed.
Thus, it is possible that the capital securities could be redeemed before
            , 2004. Any redemption will be at a redemption price equal to 100%
of the liquidation amount of the capital securities plus accumulated and unpaid
distributions to the redemption date. Under current United States federal income
tax law, such a redemption of the capital securities would be a taxable event to
the holders. See "Description of the Capital Securities-- Redemption" and
"Certain United States Federal Income Tax Consequences--Sale of Capital
Securities" below. UNBC will not exercise its right of redemption unless it has
received prior approval of the Board of Governors of the Federal Reserve System
to do so, if such approval is then required by applicable guidelines or policies
of the Board of Governors of the Federal Reserve System.
 
THE JUNIOR SUBORDINATED DEBENTURES MAY BE DISTRIBUTED TO THE HOLDERS OF THE
  CAPITAL SECURITIES
 
    Finance Trust I may be dissolved prior to its expiration, either as a result
of the occurrence of certain events or at UNBC's option. Before exercising this
right, UNBC must receive the prior approval of the
 
                                      S-14
<PAGE>
Board of Governors of the Federal Reserve System if such approval is then
required under the applicable capital guidelines or policies of the Board of
Governors of the Federal Reserve System. In such event, and subject to the terms
of the Amended and Restated Declaration of Trust of Finance Trust I, the junior
subordinated debentures will be distributed to the holders of the capital
securities and the common securities in liquidation of Finance Trust I. Although
UNBC has agreed to use its best efforts to list the junior subordinated
debentures on the New York Stock Exchange (or any other exchange on which the
capital securities are then listed) if this occurs, there can be no assurance
that the junior subordinated debentures will be approved for listing or that a
trading market will exist for the junior subordinated debentures.
 
    UNBC cannot predict the market prices for the junior subordinated debentures
that may be distributed. Accordingly, the junior subordinated debentures that
you receive upon a distribution, or the capital securities you hold pending such
a distribution, may trade at a discount to the price you paid to purchase the
capital securities.
 
    Under current United States federal income tax law, a distribution of junior
subordinated debentures upon dissolution of Finance Trust I would generally not
be a taxable event to holders of the capital securities. If, however, Finance
Trust I is characterized, for United States federal income tax purposes, as an
association taxable as a corporation at the time of the liquidation, the
distribution of the junior subordinated debentures would constitute a taxable
event to the holders of the capital securities.
 
UNBC MAY SHORTEN MATURITY OF JUNIOR SUBORDINATED DEBENTURES
 
    Upon the occurrence and continuation of certain Tax Events (as defined in
"Description of the Capital Securities--Redemption" below), in lieu of redeeming
the junior subordinated debentures, UNBC will have the right under certain
circumstances to shorten the stated maturity of the junior subordinated
debentures to, and therefore change the mandatory redemption date for the
capital securities to be, as early as             , 2014. See "Description of
the Junior Subordinated Debentures--Option to Accelerate Maturity Date" below.
 
    UNBC will only exercise this right upon receiving prior approval of the
Board of Governors of the Federal Reserve System, if then required under
applicable capital guidelines or policies of the Board of Governors of the
Federal Reserve System.
 
GENERAL MARKET CONDITIONS AND DEFERRAL RIGHTS COULD ADVERSELY AFFECT MARKET
  PRICES
 
    There can be no assurance about the market prices for the capital securities
or for the junior subordinated debentures that may be distributed in exchange
for the capital securities if Finance Trust I is dissolved. In addition, because
of UNBC's right to defer interest payments on the junior subordinated
debentures, the market price of the capital securities may be more volatile than
the market prices of similar securities that are not subject to this right.
Moreover, any exercise of this right may adversely affect the market price of
the capital securities. Accordingly, the capital securities that you purchase,
whether in this offering or in the secondary market, or the junior subordinated
debentures that you may receive on liquidation of Finance Trust I, may trade at
a discount to the price that you paid for the capital securities. Furthermore,
if you dispose of any capital securities or junior subordinated debentures
during an extension period, when trading prices may be adversely affected by the
deferral, you might not receive the same return on your investment as a holder
that holds its capital securities until the extension period ends.
 
THE MARKET PRICES OF THE CAPITAL SECURITIES MAY NOT FULLY REFLECT ACCRUED
  INTEREST
 
    The capital securities may trade at prices that do not fully reflect the
value of accrued but unpaid interest with respect to the underlying junior
subordinated debentures. A holder of capital securities that disposes of its
capital securities between record dates for any distribution payments will
nevertheless be required to include as ordinary income for United States federal
income tax purposes an amount equal to
 
                                      S-15
<PAGE>
the accrued but unpaid interest on its proportionate interest in the junior
subordinated debentures through the date of disposition. Such holder will
recognize a capital loss to the extent the selling price (which may not fully
reflect the value of accrued but unpaid interest) is less than its adjusted tax
basis. Except in certain limited circumstances, capital losses cannot be applied
to offset ordinary income for United States federal income tax purposes. See
"Certain United States Federal Income Tax Consequences--Sale of Capital
Securities" below.
 
LIMITED VOTING RIGHTS
 
    In general, holders of capital securities will have limited voting rights
relating only to the modification of Finance Trust I's Amended and Restated
Declaration of Trust (which establishes the terms and conditions of the capital
securities) and the exercise of Finance Trust I's rights as the holder of the
junior subordinated debentures. Holders of capital securities will not be
entitled to vote to appoint, remove or replace the trustees of Finance Trust I,
which voting rights are vested exclusively in UNBC as the holder of the common
securities of Finance Trust I. The Regular Trustees (as defined in "UnionBanCal
Finance Trust I" below), who are officers of UNBC, and UNBC may amend the
Amended and Restated Declaration of Trust without the consent of holders of
capital securities to ensure that (1) Finance Trust I will be classified for
United States federal income tax purposes as a grantor trust, (2) the junior
subordinated debentures will be treated for United States federal income tax
purposes as indebtedness of UNBC and (3) Finance Trust I will not be required to
register as an "investment company" under the Investment Company Act of 1940.
See "Description of the Capital Securities--Voting Rights" below.
 
NO PRIOR MARKET FOR THE CAPITAL SECURITIES
 
    The capital securities constitute a new issue of securities with no
established trading market. Although the capital securities will be listed on
the New York Stock Exchange, a listing does not guarantee that a trading market
for the capital securities will develop or, if a trading market for the capital
securities does develop, the depth of that market and the ability of holders to
sell their capital securities easily.
 
FAILURE TO COMPLETE TRANSACTIONS
 
    Although UNBC and The Bank of Tokyo-Mitsubishi, Ltd. intend to complete all
of the transactions described in "Use of Proceeds" below during the first
quarter of 1999, the transactions may not occur. The common stock offering and
the repurchases are dependent upon each other. Accordingly, if the common stock
offering does not occur, then the parties to the repurchases are not required to
complete the repurchases. Similarly, if the repurchases do not occur, then the
parties to the common stock offering are not required to complete that offering.
The proceeds from this offering will be used to purchase junior subordinated
debentures of UNBC. UNBC intends to use the proceeds from the sale of the junior
subordinated debentures to repurchase the shares of common stock in the
repurchases. Therefore, if this offering does not occur, UNBC may not have
sufficient funds to complete the repurchases, which could cause the common stock
offering to be terminated. If this offering is completed but the repurchases are
not, UNBC may have excess unused proceeds from the sale of the junior
subordinated debentures. If any of the transactions does not occur, UNBC would
not recognize certain of the anticipated benefits of the transactions as a
whole.
 
                                      S-16
<PAGE>
                          UNIONBANCAL FINANCE TRUST I
 
    Finance Trust I is a statutory business trust formed under Delaware law
pursuant to (1) a declaration of trust executed by UNBC, as sponsor, and the
trustees of Finance Trust I (the "Finance Trustees") and (2) the filing of a
certificate of trust with the Secretary of State of the State of Delaware. The
declaration will be amended and restated in its entirety (as so amended and
restated, the "Trust Declaration") substantially in the form filed as an exhibit
to the Registration Statement of which the accompanying prospectus forms a part
(the "Shelf Registration Statement"). The Trust Declaration will be qualified as
an indenture under the Trust Indenture Act. The     % Capital Securities of
Finance Trust I (the "Capital Securities") offered hereby will constitute all of
the capital securities of Finance Trust I, and UNBC will acquire all of the
common securities of Finance Trust I (the "Common Securities"), which have an
aggregate liquidation amount equal to approximately 3% of the total capital of
Finance Trust I. Finance Trust I exists for the exclusive purposes of:
 
    - issuing the Common Securities and the Capital Securities (collectively,
      the "Trust Securities"), representing undivided beneficial interests in
      the assets of Finance Trust I;
 
    - investing the gross proceeds of the Trust Securities in the     % Junior
      Subordinated Deferrable Interest Debentures of UNBC (the "Junior
      Subordinated Debentures"); and
 
    - engaging in only those other activities necessary or incidental to these
      purposes.
 
    The number of Finance Trustees will initially be five. Three of the Finance
Trustees (the "Regular Trustees") will be persons who are employees or officers
of or who are affiliated with UNBC. The fourth trustee will be a financial
institution that is unaffiliated with UNBC, which trustee will serve as property
trustee under the Trust Declaration and as indenture trustee for the purposes of
the Trust Indenture Act (the "Property Trustee"). The Property Trustee will be
the only trustee of Finance Trust I who will be a trustee for purposes of the
Trust Indenture Act and is the only entity that will perform the functions of a
trustee under such Act. The initial Property Trustee of Finance Trust I is The
First National Bank of Chicago. The fifth trustee will be a financial
institution that maintains its principal place of business in the State of
Delaware (the "Delaware Trustee"). First Chicago Delaware Inc. is the initial
Delaware Trustee. UNBC, as the holder of all of the Common Securities, will be
entitled to appoint, remove or replace any of, or increase or reduce the number
of, the Finance Trustees of Finance Trust I. The First National Bank of Chicago
will also act as indenture trustee (the "Guarantee Trustee") under the guarantee
to be issued by UNBC (the "Guarantee"). See "Description of the Guarantee"
below.
 
    The Property Trustee will hold title to the Junior Subordinated Debentures
for the benefit of the holders of the Trust Securities, and the Property Trustee
will have the power to exercise all rights, powers and privileges under the
Indenture as the holder of the Junior Subordinated Debentures. In addition, the
Property Trustee will maintain exclusive control of a segregated non-interest
bearing bank account (the "Property Account") to hold all payments made in
respect of the Junior Subordinated Debentures for the benefit of the holders of
the Trust Securities. The Property Trustee will make payments of distributions
and payments on liquidation, redemption and otherwise to the holders of the
Trust Securities out of funds from the Property Account. The Guarantee Trustee
will hold the Guarantee for the benefit of the holders of the Capital
Securities. UNBC, as the holder of all the Common Securities, will have the
right to appoint, remove or replace any Finance Trustee and to increase or
decrease the number of Finance Trustees. UNBC will pay all fees and expenses
related to Finance Trust I and the offering of the Trust Securities. See
"Description of the Junior Subordinated Debentures--Miscellaneous" below.
 
    The Common Securities will rank PARI PASSU, and payments will be made
thereon PRO RATA, with the Capital Securities, except that upon the occurrence
and continuance of an event of default under the Trust Declaration resulting
from an Event of Default under the Indenture, the rights of the holders of the
Common Securities to payment in respect of distributions and payments upon
liquidation, redemption or otherwise will be subordinated to the rights of
holders of the Capital Securities.
 
                                      S-17
<PAGE>
    The rights of the holders of the Capital Securities, including economic
rights, rights to information and voting rights, are set forth in the Trust
Declaration, the Delaware Business Trust Act (the "Business Trust Act") and the
Trust Indenture Act. See "Description of the Capital Securities" below. It is
expected that at the time the Shelf Registration Statement becomes effective,
the Trust Declaration, the Indenture and the Guarantee will be qualified under
the Trust Indenture Act.
 
                                THE TRANSACTIONS
 
    UNBC is seeking to repurchase shares of its common stock from two of its
existing shareholders. We expect to repurchase $250 million in shares of our
common stock from The Bank of Tokyo-Mitsubishi, concurrently with the closing of
a $750 million offering of our common stock by The Bank of Tokyo Mitsubishi. We
expect to repurchase the shares at the public offering price in the common stock
offering, less the underwriting discounts and commissions. In addition, we are
currently negotiating with another foreign institutional shareholder regarding
the repurchase of approximately 2.1 million shares of our common stock. Two
other foreign institutional shareholders decided not to participate in the
repurchase. We intend to use the net proceeds of this offering of Capital
Securities to finance both of the repurchases. This offering, the repurchases
and the common stock offering are referred to in this prospectus as the
"Transactions." We anticipate that this offering and the common stock offering
will close in the first quarter of 1999.
 
    From UNBC's point of view the Transactions are principally designed to
improve our return on average common equity and earnings per share and to
increase our public float. In addition, the sale of common stock by The Bank of
Tokyo-Mitsubishi to the public will raise proceeds for, and enhance the capital
base of, The Bank of Tokyo-Mitsubishi.
 
    The repurchase of the common stock from The Bank of Tokyo-Mitsubishi and the
issuance of the capital securities would, on a pro forma basis:
 
    - increase UNBC's return on average common equity from 16.87% to    % at
      September 30, 1998; and
 
    - increase UNBC's diluted earnings per share for the year ended December 31,
      1997 and nine months ended September 30, 1998 from $2.30 up to $   , and
      from $2.01 up to $   , respectively, representing an approximate    %
      increase and an approximate    % increase, respectively.
 
    The sale of the common stock by The Bank of Tokyo-Mitsubishi to the public
will also substantially increase the percentage of UNBC's common stock held by
public investors. This increase in public shareholders will increase our common
stock's float. The Bank of Tokyo-Mitsubishi currently owns 81.6% of our common
stock and will own    % after the Transactions.
 
    We believe the Transactions will provide UNBC with additional benefits. The
Transactions should increase our market visibility as a result of more research
coverage and should make our common stock a more attractive acquisition
currency. The Transactions will not result in a material change to our Tier 1
risk-based capital ratio, our total risk-based capital ratio or our leverage
ratio.
 
                                      S-18
<PAGE>
                                USE OF PROCEEDS
 
    Finance Trust I will use all of the proceeds received from the sale of the
Capital Securities to purchase Junior Subordinated Debentures from UNBC. UNBC
will use the net proceeds to be received from the sale of the Junior
Subordinated Debentures, after deducting estimated expenses of $        and
underwriting discounts and commissions in respect of the sale of the Capital
Securities, to repurchase $250 million of its common stock from its majority
shareholder, The Bank of Tokyo-Mitsubishi, Ltd., and 2.1 million shares of
common stock from another foreign institutional shareholder. Pending such use,
UNBC will temporarily invest the net proceeds in   -  . [Add additional use of
proceeds if repurchases do not occur]
 
    UNBC is required by the Board of Governors of the Federal Reserve System
(the "Federal Reserve") to maintain certain levels of capital for bank
regulatory purposes. On October 21, 1996, the Federal Reserve announced that
long-term cumulative capital securities having the characteristics of the
Capital Securities could be included as Tier 1 capital for bank holding
companies. Such Tier 1 capital treatment, together with UNBC's ability to
deduct, for United States federal income tax purposes, interest payable on the
Junior Subordinated Debentures, will provide UNBC with a more cost-effective
means of obtaining capital for regulatory purposes than other Tier 1 capital
alternatives currently available to it.
 
                                      S-19
<PAGE>
                                 CAPITALIZATION
 
    The following table presents the short-term debt and total capitalization of
UNBC on a consolidated basis at September 30, 1998. The "As Adjusted for The
Transactions" column presents our capitalization at September 30, 1998, after
giving effect to this offering, the offering of the common stock by The Bank of
Tokyo-Mitsubishi and the repurchase of shares of our common stock from The Bank
of Tokyo-Mitsubishi and a foreign institutional shareholder.
 
<TABLE>
<CAPTION>
                                                                                         SEPTEMBER 30, 1998
                                                                                   -------------------------------
                                                                                                    AS ADJUSTED
                                                                                                        FOR
                                                                                      ACTUAL      THE TRANSACTIONS
                                                                                   -------------  ----------------
                                                                                             (UNAUDITED)
                                                                                           (IN THOUSANDS)
<S>                                                                                <C>            <C>
Short-term debt:
  Federal funds purchased and securities sold under repurchase agreements........  $   1,574,163   $
  Commercial paper...............................................................      1,417,077
  Other borrowed funds...........................................................        339,340
                                                                                   -------------  ----------------
      Total short-term debt......................................................  $   3,330,580   $
                                                                                   -------------  ----------------
                                                                                   -------------  ----------------
 
Long-term debt:
  UNBC-obligated mandatorily redeemable preferred securities of subsidiary
    grantor trust whose sole assets are junior subordinated debentures of
    UNBC(1)......................................................................  $          --   $
  Subordinated capital notes.....................................................        298,000
                                                                                   -------------  ----------------
      Total long-term debt.......................................................        298,000
                                                                                   -------------  ----------------
 
Shareholders' equity:
  Preferred stock, 5,000,000 shares authorized, none outstanding.................             --               --
 
  Common stock, 300,000,000 shares authorized, 175,208,037 shares
    outstanding(2)...............................................................        292,013
  Additional paid-in capital.....................................................      1,430,539
  Retained earnings..............................................................      1,233,068
  Accumulated other comprehensive income.........................................         29,330
                                                                                   -------------  ----------------
      Total shareholders' equity.................................................      2,984,950
                                                                                   -------------  ----------------
        Total capitalization.....................................................  $   3,282,950   $
                                                                                   -------------  ----------------
                                                                                   -------------  ----------------
 
Tier 1 risk-based capital ratio..................................................           9.53%
Total risk-based capital ratio...................................................          11.51
Return on average common equity ratio............................................          16.87
</TABLE>
 
- ------------------------
 
(1) The sole asset of the subsidiary trust is the $        aggregate principal
    amount of the   % Junior Subordinated Debentures due     of UNBC.
 
(2) On November 18, 1998, our Board of Directors approved a 3-for-1 common stock
    split and a corresponding increase in the number of authorized shares of our
    common stock to 300,000,000, which became effective on December 7, 1998.
 
                                      S-20
<PAGE>
               SELECTED CONSOLIDATED FINANCIAL AND OPERATING DATA
 
    The selected financial and other data as of December 31, 1996 and 1997 and
for the years ended December 31, 1995, 1996 and 1997 are derived from our
audited consolidated financial statements included in this prospectus. The
selected financial and other data for the year ending December 31, 1994 and as
of December 31, 1995 are derived from our audited consolidated financial
statements that are not included in this prospectus. The selected financial and
other data as of December 31, 1993 and 1994 and for the year ended December 31,
1993 are derived from the combined historical financial information of Union
Bank and BanCal Tri-State Corporation and its banking subsidiary, The Bank of
California, N.A. Such combined historical information was, in turn, derived from
the separate audited consolidated financial statements of Union Bank and BanCal
Tri-State for those periods that are not included in this prospectus. The
selected financial and other data as of September 30, 1997 and 1998 and for the
nine-month periods ended September 30, 1997 and 1998 are derived from our
unaudited consolidated financial statements included in this prospectus, which,
in the opinion of our management, include all adjustments necessary for a fair
presentation of our financial position at such date and the results of
operations for such interim period. The results for the nine-month period ended
September 30, 1998 are not necessarily indicative of the results to be expected
of the full fiscal year. We have restated all historical financial information
as if the combination of Union Bank with BanCal Tri-State Corporation and its
banking subsidiary, The Bank of California, N.A., which occurred on April 1,
1996, had been in effect for all periods presented. You should read the
following data with the more detailed information contained in "Management's
Discussion and Analysis of Financial Condition and Results of Operations" and
our consolidated financial statements and the notes to the consolidated
financial statements, each included in this prospectus.
 
                                      S-21
<PAGE>
<TABLE>
<CAPTION>
                                                                                                             NINE MONTHS
                                                                                                                ENDED
                                                                                                              SEPTEMBER
                                                              YEAR ENDED DECEMBER 31,                            30
                                         ------------------------------------------------------------------  -----------
                                              1993          1994         1995         1996         1997         1997
                                         --------------  -----------  -----------  -----------  -----------  -----------
                                                          (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                      <C>             <C>          <C>          <C>          <C>          <C>
RESULTS OF OPERATIONS:
  Net interest income(1)...............  $      986,411  $ 1,007,789  $ 1,152,777  $ 1,175,302  $ 1,237,010  $   917,408
  Provision for credit losses..........         151,000       73,000       53,250       40,000      --           --
  Noninterest income...................         405,965      359,831      395,319      418,676      463,001      342,627
  Noninterest expense(2)...............       1,055,020    1,036,349      978,101    1,134,904    1,044,665      762,208
                                         --------------  -----------  -----------  -----------  -----------  -----------
  Income before income taxes and
  cumulative effect of accounting
  change(1)............................         186,356      258,271      516,745      419,074      655,346      497,827
  Taxable-equivalent adjustment........          14,734       12,566       10,444        6,724        5,328        4,107
  Income tax expense...................          63,966      120,356      193,359      162,892      238,722      174,869
                                         --------------  -----------  -----------  -----------  -----------  -----------
  Income before cumulative effect of
  accounting change                             107,656      125,349      312,942      249,458      411,296      318,851
  Cumulative effect of accounting
  change(3)                                     192,793           --           --           --           --           --
                                         --------------  -----------  -----------  -----------  -----------  -----------
  Net income...........................  $      300,449  $   125,349  $   312,942  $   249,458  $   411,296  $   318,851
                                         --------------  -----------  -----------  -----------  -----------  -----------
                                         --------------  -----------  -----------  -----------  -----------  -----------
NET INCOME APPLICABLE TO COMMON STOCK..  $      289,174  $   114,045  $   301,637  $   238,152  $   403,696  $   311,251
                                         --------------  -----------  -----------  -----------  -----------  -----------
                                         --------------  -----------  -----------  -----------  -----------  -----------
PER COMMON SHARE:(4)
  Net income -- basic(5)...............  $         1.73  $      0.67  $      1.74  $      1.37  $      2.31  $      1.78
  Net income -- diluted(5).............            1.73         0.67         1.73         1.36         2.30         1.78
  Pro forma earnings -- basic,
    excluding after tax merger and
    integration expense and cumulative
    effect of accounting change(2).....            0.58         0.67         1.74         1.78         2.33         1.80
  Pro forma earnings -- diluted,
    excluding after tax merger and
    integration expense and cumulative
    effect of accounting change(2).....            0.58         0.67         1.73         1.77         2.32         1.80
  Dividends(6).........................            0.47         0.47         0.47         0.47         0.51         0.37
  Book value (end of period)(7)........           11.64        11.88        13.49        13.53        15.32        14.96
  Common shares outstanding (end of
    period)............................     169,989,829  172,043,617  174,180,493  174,457,603  174,917,674  174,848,461
  Weighted average common shares
    outstanding -- basic...............     166,857,166  171,089,311  173,806,300  174,391,048  174,683,338  174,614,764
  Weighted average common shares
    outstanding -- diluted.............     166,917,256  171,149,731  174,099,241  174,783,565  175,189,078  175,071,292
BALANCE SHEET DATA (END OF PERIOD):
  Total assets.........................  $   24,005,530  $24,569,042  $27,546,859  $29,234,059  $30,585,265  $30,982,479
  Total loans..........................      17,759,181   18,065,650   20,431,683   21,049,787   22,741,408   22,297,724
  Nonperforming assets.................       1,193,450      421,227      246,871      156,784      129,809      132,974
  Total deposits.......................      16,978,347   17,409,737   19,655,043   21,532,960   23,296,374   22,974,188
  Subordinated capital notes...........         725,859      655,859      501,369      382,000      348,000      382,000
  Preferred Stock......................         135,000      135,000      135,000      135,000      --           --
  Common equity........................       1,978,455    2,044,202    2,349,092    2,359,933    2,679,299    2,615,327
BALANCE SHEET DATA (PERIOD AVERAGE):
  Total assets.........................  $   23,926,924  $23,692,560  $25,564,843  $27,899,734  $29,692,992  $29,451,728
  Total loans..........................      18,219,288   17,616,002   18,974,540   20,727,577   21,855,911   21,693,329
  Earning assets.......................      21,176,396   21,046,600   22,849,129   24,717,326   26,291,822   26,066,274
  Total deposits.......................      17,160,129   16,826,443   17,969,972   20,101,544   22,067,155   21,823,524
  Common equity........................       1,917,530    1,980,577    2,197,476    2,325,437    2,514,610    2,469,521
OTHER DATA:
  Return on average assets(8)..........            1.26%        0.53%        1.22%        0.89%        1.39%        1.45%
  Pro forma return on average assets,
    excluding after-tax merger and
    integration expense and cumulative
    effect of accounting
    change(2)(8).......................            0.45         0.53         1.22         1.15         1.40         1.46
  Return on average common equity(9)...           15.08         5.76        13.73        10.24        16.05        16.85
  Pro forma return on average common
    equity, excluding after-tax merger
    and integration expense and
    cumulative effect of accounting
    change(2)(9).......................            5.03         5.76        13.73        13.33        16.20        17.04
  Efficiency ratio(10).................           66.92        70.39        63.39        71.02        61.53        60.55
  Pro forma efficiency ratio, excluding
    merger and integration
    expense(2)(10).....................           66.92        70.39        63.39        63.65        61.17        60.07
 
<CAPTION>
 
                                            1998
                                         -----------
 
<S>                                      <C>
RESULTS OF OPERATIONS:
  Net interest income(1)...............  $   983,056
  Provision for credit losses..........       45,000
  Noninterest income...................      399,949
  Noninterest expense(2)...............      836,178
                                         -----------
  Income before income taxes and
  cumulative effect of accounting
  change(1)............................      501,827
  Taxable-equivalent adjustment........        3,417
  Income tax expense...................      146,045
                                         -----------
  Income before cumulative effect of
  accounting change                          352,365
  Cumulative effect of accounting
  change(3)                                       --
                                         -----------
  Net income...........................  $   352,365
                                         -----------
                                         -----------
NET INCOME APPLICABLE TO COMMON STOCK..  $   352,365
                                         -----------
                                         -----------
PER COMMON SHARE:(4)
  Net income -- basic(5)...............  $      2.01
  Net income -- diluted(5).............         2.01
  Pro forma earnings -- basic,
    excluding after tax merger and
    integration expense and cumulative
    effect of accounting change(2).....         2.01
  Pro forma earnings -- diluted,
    excluding after tax merger and
    integration expense and cumulative
    effect of accounting change(2).....         2.01
  Dividends(6).........................         0.42
  Book value (end of period)(7)........        17.04
  Common shares outstanding (end of
    period)............................  175,208,037
  Weighted average common shares
    outstanding -- basic...............  175,090,890
  Weighted average common shares
    outstanding -- diluted.............  175,728,849
BALANCE SHEET DATA (END OF PERIOD):
  Total assets.........................  $31,407,318
  Total loans..........................   23,497,845
  Nonperforming assets.................       81,399
  Total deposits.......................   23,663,129
  Subordinated capital notes...........      298,000
  Preferred Stock......................      --
  Common equity........................    2,984,950
BALANCE SHEET DATA (PERIOD AVERAGE):
  Total assets.........................  $30,130,893
  Total loans..........................   22,916,992
  Earning assets.......................   27,002,879
  Total deposits.......................   22,386,160
  Common equity........................    2,792,727
OTHER DATA:
  Return on average assets(8)..........         1.56%
  Pro forma return on average assets,
    excluding after-tax merger and
    integration expense and cumulative
    effect of accounting
    change(2)(8).......................         1.56
  Return on average common equity(9)...        16.87
  Pro forma return on average common
    equity, excluding after-tax merger
    and integration expense and
    cumulative effect of accounting
    change(2)(9).......................        16.87
  Efficiency ratio(10).................        60.51
  Pro forma efficiency ratio, excluding
    merger and integration
    expense(2)(10).....................        60.51
</TABLE>
 
                                      S-22
<PAGE>
<TABLE>
<S>                                      <C>             <C>          <C>          <C>          <C>          <C>
  Net interest margin(11)..............            4.66         4.79         5.05         4.75         4.70         4.70
  Dividend payout ratio(12)............           27.17        70.15        27.01        34.31        22.08        20.79
  Tier 1 risk-based capital
  ratio(13)............................            8.88         9.24         9.35         9.08         8.96         8.92
  Total risk-based capital ratio(14)...           12.07        12.03        11.70        11.17        11.05        11.02
  Leverage ratio(15)...................            8.26         8.67         8.70         8.41         8.53         8.39
  Allowances for credit losses to total
    loans(16)..........................            3.90         3.12         2.72         2.49         1.99         2.15
  Allowance for credit losses to
    nonaccrual loans(17)...............           84.82       161.08       266.56       408.48       413.12       435.92
  Net loans charged off to average
    total loans(18)....................            1.37         1.15         0.32         0.34         0.33         0.28
  Nonperforming assets to total loans
    and foreclosed assets(19)..........            6.58         2.32         1.21         0.74         0.57         0.60
  Nonperforming assets to total
  assets(20)...........................            4.97         1.71         0.90         0.54         0.42         0.43
 
<CAPTION>
  Net interest margin(11)..............         4.86
  Dividend payout ratio(12)............        20.90
  Tier 1 risk-based capital
  ratio(13)............................         9.53
  Total risk-based capital ratio(14)...        11.51
  Leverage ratio(15)...................         9.37
  Allowances for credit losses to total
    loans(16)..........................         2.02
  Allowance for credit losses to
    nonaccrual loans(17)...............       697.19
  Net loans charged off to average
    total loans(18)....................         0.12
  Nonperforming assets to total loans
    and foreclosed assets(19)..........         0.35
  Nonperforming assets to total
  assets(20)...........................         0.26
</TABLE>
 
- ------------------------
 
(1) Amounts are on a taxable-equivalent basis using the federal statutory tax
    rate of 35 percent.
 
(2) Merger and integration expense was $117 million and $6 million for 1996 and
    1997, respectively, and after-tax merger and integration expense was $72
    million and $4 million for 1996 and 1997, respectively. Merger and
    integration expense was $6 million ($4 million after-tax) for the nine
    months ended September 30, 1997. See page S-44 "Year Ended December 31, 1997
    compared to Year Ended December 31, 1996" for a description of merger
    accounting and pro forma presentations.
 
(3) 1993 net income includes the cumulative effect of the adoption of Statement
    of Financial Accounting Standards No. 109, "Accounting for Income Taxes."
 
(4) Amounts have been restated to give retroactive effect to the December 1998
    3-for-1 stock split.
 
(5) Basic and diluted earnings per share is computed by dividing net income
    applicable to common stock by the weighted average number of common shares
    outstanding during the period. Diluted earnings per share incorporate the
    dilutive effects of outstanding stock options.
 
(6) Dividends per share reflect dividends declared on UNBC's common stock
    outstanding as of the declaration date. Amounts prior to the merger on April
    1, 1996 are based on Union Bank only and do not include the dividend of $145
    million paid to The Mitsubishi Bank, Limited in the first quarter of 1996 by
    BanCal Tri-State Corporation and The Bank of California, N.A.
 
(7) Book value per share is computed by dividing the common equity at the end of
    the period by the number of common shares outstanding at the end of the
    period.
 
(8) Return on average assets is computed by dividing net income by the average
    assets for the period. Net income for the nine months ended September 30,
    1997 and 1998 has been annualized.
 
(9) Return on average common equity is computed by dividing net income
    applicable to common stock by average common equity for the period. Net
    income for the nine months ended September 30, 1997 and 1998 has been
    annualized.
 
(10) The efficiency ratio is noninterest expense, excluding foreclosed asset
    expense (income), as a percentage of net interest income
    (taxable-equivalent) and noninterest income. Foreclosed asset expense
    (income) was $123.3 million, $73.7 million, $(3.2) million, $2.9 million and
    $(1.3) million for the years ended 1993 through 1997, respectively. For the
    nine months ended September 30, 1997 and 1998, foreclosed asset expense
    (income) was $(0.7) million in each period.
 
(11) The net interest margin is computed by dividing net interest income
    (taxable-equivalent) by average earning assets for the period. Net interest
    income (taxable-equivalent) for the nine months ended September 30, 1997 and
    1998 has been annualized.
 
(12) The dividend payout ratio is computed by dividing dividends applicable to
    common shareholders for the period by net income available to common
    shareholders for the period.
 
(13) The Tier 1 risk-based capital ratio is computed by dividing Tier 1 capital
    (common and preferred equity, less certain intangible assets) by risk
    weighted period-end assets.
 
                                      S-23
<PAGE>
(14) The total risk-based capital ratio was computed by dividing total capital
    (Tier 1 capital, subordinated debt, and a limited amount of the allowance
    for credit losses) by risk weighted period-end assets (excluding certain
    intangible assets).
 
(15) The leverage ratio is computed by dividing Tier 1 capital by quarterly
    average assets (excluding certain intangible assets).
 
(16) The allowance for credit losses to total loans is computed by dividing the
    allowance for credit losses at the end of the period by total loans at the
    end of the period.
 
(17) The allowance for credit losses to nonaccrual loans is computed by dividing
    the allowance for credit losses at the end of the period by nonaccrual loans
    at the end of the period.
 
(18) Net loans charged off to average total loans is computed by dividing the
    net loans charged off for the period by average total loans for the period.
    Net loans charged off for the nine months ended September 30, 1997 and 1998
    has been annualized.
 
(19) Nonperforming assets to total loans and foreclosed assets is computed by
    dividing nonperforming assets at the end of the period by total loans and
    foreclosed assets at the end of the period.
 
(20) Nonperforming assets to total assets is computed by dividing nonperforming
    assets at the end of the period by total assets at the end of the period.
 
                                      S-24
<PAGE>
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
    YOU SHOULD READ THE FOLLOWING DISCUSSION AND ANALYSIS OF OUR FINANCIAL
CONDITION AND THE RESULTS OF OUR OPERATIONS TOGETHER WITH OUR FINANCIAL
STATEMENTS AND THE NOTES TO THOSE FINANCIAL STATEMENTS INCLUDED IN THIS
PROSPECTUS. CERTAIN AMOUNTS FOR PRIOR PERIODS HAVE BEEN RECLASSIFIED TO CONFORM
TO CURRENT FINANCIAL STATEMENT PRESENTATION.
 
    INTRODUCTION
 
    UnionBanCal Corporation, or "UNBC," is a California-based commercial bank
holding company with consolidated assets of $31.4 billion at September 30, 1998.
Based on total assets, UNBC, together with its consolidated subsidiaries, was
the third largest bank holding company in California and among the 30 largest in
the United States. At September 30, 1998, we operated 244 full-service branches
in California, six banking offices in Oregon and Washington, and 18 overseas
facilities.
 
    The combination of Union Bank with BanCal Tri-State Corporation and its
banking subsidiary, The Bank of California, N.A., was completed on April 1, 1996
(the "Merger"), resulting in UnionBanCal Corporation and its banking subsidiary,
Union Bank of California, N.A. The combination was accounted for as a
reorganization of entities under common control (similar to a pooling of
interests). Accordingly, all historical financial information has been restated
as if the combination had been in effect for all periods presented.
 
    On August 10, 1998, UNBC and its consolidated subsidiaries exchanged 10.2
million shares of its common stock for the 7.2 million shares of the common
stock of Union Bank of California, N.A. owned directly by The Bank of
Tokyo-Mitsubishi, Ltd. This share exchange provided UNBC with a 100 percent
ownership interest in Union Bank of California, N.A. In addition, it increased
The Bank of Tokyo-Mitsubishi's ownership percentage of UNBC to 82 percent from
81 percent.
 
    The exchange of shares was accounted for as a reorganization of entities
under common control. Accordingly, amounts previously reported as "Parent Direct
Interest in Bank Subsidiary," including the proportionate share of net income,
dividends, and other comprehensive income, have been reclassified to combine
them with the corresponding amounts attributable to our common shareholders for
all periods presented.
 
    On November 18, 1998, our Board of Directors approved the declaration of a
3-for-1 stock split effective for shareholders of record on December 7, 1998.
Accordingly, all historical financial information has been restated as if the
stock split had been in effect for all periods presented.
 
NINE MONTHS ENDED SEPTEMBER 30, 1998 COMPARED TO NINE MONTHS ENDED SEPTEMBER 30,
  1997
 
    SUMMARY
 
    Net income for the first nine months of 1998 was $352.4 million, compared to
$318.9 million for the first nine months of 1997. Net income applicable to
common stock was $352.4 million, or $2.01 per diluted common share, for the
first nine months of 1998, compared with $311.3 million, or $1.78 per diluted
common share, for the first nine months of 1997. Excluding the tax benefit of
$52.4 million, net of federal tax, recorded in the first nine months of 1998,
net income applicable to common stock was $299.9 million, or $1.71 per diluted
common share. Excluding the $24.7 million tax refund for the first nine months
of 1997, net income applicable to common stock was $286.6 million, or $1.64 per
diluted common share.
 
    Other highlights of the first nine months of 1998 include:
 
    - Net interest income, on a taxable-equivalent basis, was $983.1 million for
      the first nine months of 1998, a $65.6 million, or 7 percent, increase
      from the comparable period one year earlier. The increase in net interest
      income was primarily due to a 16 basis point increase in the net interest
 
                                      S-25
<PAGE>
      margin and a $936.6 million, or 4 percent, increase in average earning
      assets, resulting primarily from a $1.2 billion, or 6 percent, increase in
      average loans, largely funded by a $1.1 billion, or 15 percent, increase
      in average noninterest bearing deposits.
 
    - A provision for credit losses of $45.0 million was recorded for the first
      nine months of 1998, compared with no provision in 1997. Net charge-offs
      for the nine months ended September 30, 1998 were $21.0 million. This
      resulted from management's regular quarterly assessments of overall credit
      quality, loan growth and economic conditions in relation to the level of
      the allowance for credit losses.
 
    - Noninterest income was $399.9 million, an increase of $57.3 million, or 17
      percent, over the first nine months of 1997. This increase includes the
      $17.1 million gain from the sale of the credit card portfolio in the
      second quarter of 1998. Service charges on deposit accounts grew $16.6
      million, or 20 percent, reflecting growth in average deposits; trust and
      investment management fees increased $12.1 million, or 16 percent, on
      growth in assets under management; international commissions and fees
      increased $4.9 million; and securities gains, net increased $3.5 million,
      primarily from the sale of securities available for sale.
 
    - Noninterest expense was $836.2 million for the first nine months of 1998,
      compared with $762.2 million for the first nine months of 1997, an
      increase of $74.0 million, or 10 percent. Personnel-related expense
      increased $40.6 million, or 10 percent, primarily due to increases in
      salaries, a portion of which relates to increases in staffing,
      performance-based incentive compensation as well as a decline in the fair
      value of assets underlying postretirement benefit plans, caused by the
      downturn in the financial markets. Professional fees increased $6.1
      million, or 32 percent, primarily due to additional costs related to the
      year 2000 effort. Other noninterest expense increased $24.4 million, or 22
      percent, primarily attributable to additional expenses incurred to support
      higher deposit volumes.
 
    - The effective tax rate for the first nine months of 1998 was 29 percent,
      compared with 35 percent for the first nine months of 1997. The lower
      effective tax rate for the first nine months of 1998 was the result of a
      total reduction of $52.4 million, net of federal tax, in state income tax
      liabilities. Excluding this state tax reduction, the effective tax rate
      for the first nine months of 1998 was 40 percent. Excluding the $24.7
      million after-tax refund from the State of California Franchise Tax Board,
      the effective tax rate for the first nine months of 1997 was 40 percent.
 
    - The return on average assets for the first nine months of 1998 increased
      to 1.56 percent, compared to 1.45 percent for the first nine months of
      1997. The return on average common equity increased slightly to 16.87
      percent for the first nine months of 1998, compared to 16.85 percent for
      the first nine months of 1997.
 
    - Total loans at September 30, 1998 increased $756.4 million, or 3 percent,
      over December 31, 1997, primarily due to growth in the commercial,
      financial and industrial portfolio.
 
    - Our Tier 1 and total risk-based capital ratios were 9.53 percent and 11.51
      percent at September 30, 1998, compared with 8.96 percent and 11.05
      percent at December 31, 1997. Our September 30, 1998 leverage ratio was
      9.37 percent, compared with 8.53 percent at December 31, 1997.
 
                                      S-26
<PAGE>
    NET INTEREST INCOME
 
<TABLE>
<CAPTION>
                                                                    FOR THE NINE MONTHS ENDED
                                          ------------------------------------------------------------------------------
                                                    SEPTEMBER 30, 1997                      SEPTEMBER 30, 1998
                                          --------------------------------------  --------------------------------------
                                                         INTEREST      AVERAGE                   INTEREST      AVERAGE
                                            AVERAGE       INCOME/      YIELD/       AVERAGE       INCOME/      YIELD/
                                            BALANCE     EXPENSE(1)     RATE(1)      BALANCE     EXPENSE(1)     RATE(1)
                                          ------------  -----------  -----------  ------------  -----------  -----------
                                                                      (DOLLARS IN THOUSANDS)
<S>                                       <C>           <C>          <C>          <C>           <C>          <C>
ASSETS:
  Loans:(2)
    Domestic............................  $ 20,218,298  $ 1,245,658        8.23%  $ 21,569,891  $ 1,297,483        8.04%
    Foreign(3)..........................     1,475,031       66,578        6.03      1,347,101       68,380        6.79
  Securities -- taxable(4)..............     2,476,970      116,715        6.29      2,949,151      139,720        6.32
  Securities -- tax-exempt(4)...........       126,634        9,567       10.07        106,783        8,348       10.42
  Interest bearing deposits in banks....       996,710       43,404        5.82        279,938       14,187        6.78
  Federal funds sold and securities
    purchased under resale agreements...       450,603       18,727        5.56        281,565       11,784        5.60
  Trading account assets................       322,028       13,389        5.56        468,450       20,137        5.75
                                          ------------  -----------               ------------  -----------
      Total earning assets..............    26,066,274    1,514,038        7.76     27,002,879    1,560,039        7.72
                                          ------------  -----------               ------------  -----------
  Allowance for credit losses...........      (514,043)                               (471,384)
  Cash and due from banks...............     2,005,177                               1,903,155
  Premises and equipment, net...........       413,024                                 402,197
  Other assets..........................     1,481,296                               1,294,046
                                          ------------                            ------------
      Total assets......................  $ 29,451,728                            $ 30,130,893
                                          ------------                            ------------
                                          ------------                            ------------
LIABILITIES:
  Domestic deposits:
    Interest bearing....................  $  5,274,137  $   111,457        2.83   $  5,447,712  $   115,626        2.84
    Savings and consumer time...........     2,956,493       83,695        3.78      3,176,898       90,713        3.82
  Large time............................     4,691,506      191,547        5.46      3,606,182      146,945        5.45
  Foreign deposits(3)...................     1,560,149       55,156        4.73      1,723,282       66,454        5.16
                                          ------------  -----------               ------------  -----------
      Total interest bearing deposits...    14,482,285      441,855        4.08     13,954,074      419,738        4.02
                                          ------------  -----------               ------------  -----------
  Federal funds purchased and securities
    sold under repurchase agreements....     1,106,180       44,053        5.32      1,481,809       59,667        5.38
  Subordinated capital notes............       353,429       17,180        6.50        335,179       15,883        6.34
  Commercial paper......................     1,631,056       66,543        5.45      1,641,425       67,720        5.52
  Other borrowed funds..................       673,359       26,999        5.36        323,082       13,975        5.78
                                          ------------  -----------               ------------  -----------
      Total borrowed funds..............     3,764,024      154,775        5.50      3,781,495      157,245        5.56
                                          ------------  -----------               ------------  -----------
      Total interest bearing
        liabilities.....................    18,246,309      596,630        4.37     17,735,569      576,983        4.35
                                                        -----------                             -----------
  Noninterest bearing deposits..........     7,341,239                               8,432,086
  Other liabilities.....................     1,274,000                               1,170,511
                                          ------------                            ------------
      Total liabilities.................    26,861,548                              27,338,166
                                          ------------                            ------------
                                          ------------                            ------------
SHAREHOLDERS' EQUITY
  Preferred stock.......................       120,659                                 --
  Common equity.........................     2,469,521                               2,792,727
                                          ------------                            ------------
      Total shareholders' equity........     2,590,180                               2,792,727
                                          ------------                            ------------
      Total liabilities and
        shareholders' equity............  $ 29,451,728                            $ 30,130,893
                                          ------------                            ------------
                                          ------------                            ------------
  Net interest income/margin (taxable-
    equivalent basis)...................                    917,408        4.70%                    983,056        4.86%
  Less: taxable-equivalent adjustment...                      4,107                                   3,417
                                                        -----------                             -----------
      Net interest income...............                $   913,301                             $   979,639
                                                        -----------                             -----------
                                                        -----------                             -----------
</TABLE>
 
- --------------------------
(1) Yields and interest income are presented on a taxable-equivalent basis using
    the federal statutory tax rate of 35 percent.
(2) Average balances on loans outstanding include all nonperforming and
    renegotiated loans. The amortized portion of net loan origination fees
    (costs) is included in interest income on loans, representing an adjustment
    to the yield.
(3) Foreign loans and deposits are those loans and deposits originated in
    foreign branches.
(4) Yields on securities available for sale are based on fair value. The
    difference between these yields and those based on amortized cost was not
    significant.
 
                                      S-27
<PAGE>
    Net interest income is interest earned on loans and investments less
interest expense on deposit accounts and borrowings. Primary factors affecting
the level of net interest income include the margin between the yield earned on
interest earning assets and the rate paid on interest bearing liabilities, as
well as the volume and composition of average interest earning assets and
average interest bearing liabilities.
 
    For the first nine months of 1998, net interest income, on a taxable
equivalent basis, was $983.1 million, compared with $917.4 million in the
comparable period one year earlier. The increase of $65.6 million, or 7 percent,
was primarily attributable to a $936.6 million, or 4 percent, increase in
average earning assets largely funded by a $1.1 billion, or 15 percent, increase
in average noninterest bearing deposits. In addition, the net interest margin
increased 16 basis points to 4.86 percent. Although the differential between the
decrease in the yield on average earning assets and the decrease in the rate of
average interest bearing liabilities was a negative 2 basis points, the negative
impact on the net interest margin of these two factors was more than offset by
the increase in the proportion of funding provided by average noninterest
bearing deposits.
 
    Average earning assets were $26.1 billion and $27.0 billion, for the nine
months ended September 30, 1997 and 1998, respectively. Most of this increase
was attributable to growth in average loans, which increased $1.2 billion, or 6
percent, and average securities, which were $452.3 million, or 17 percent,
higher. This increase was partially offset by a $716.8 million decrease in
average interest bearing deposits in banks. The growth in average loans
outstanding was attributable to the increase in average commercial, financial
and industrial loans of $1.5 billion, partly offset by the decrease in average
consumer loans of $337.4 million, which was primarily related to the sale of the
credit card portfolio. See "Loans" on page S-31 for additional commentary on
growth in the loan portfolio. The increase in primarily fixed rate securities
reflected interest rate risk management actions to reduce our exposure to
declines in interest rates.
 
    NONINTEREST INCOME
 
<TABLE>
<CAPTION>
                                                                                   FOR THE NINE MONTHS ENDED
                                                                            ---------------------------------------
                                                                            SEPTEMBER 30,  SEPTEMBER 30,   PERCENT
                                                                                1997           1998        CHANGE
                                                                            -------------  -------------  ---------
                                                                                    (DOLLARS IN THOUSANDS)
<S>                                                                         <C>            <C>            <C>
Service charges on deposit accounts.......................................   $    84,699    $   101,288       19.59%
Trust and investment management fees......................................        76,737         88,806       15.73
International commissions and fees........................................        49,593         54,516        9.93
Merchant transaction processing fees......................................        42,653         42,988        0.79
Merchant banking fees.....................................................        19,899         24,083       21.03
Brokerage commissions and fees............................................        11,529         14,188       23.06
Foreign exchange trading gains, net.......................................        11,249         14,159       25.87
Securities gains, net.....................................................         2,098          5,579      165.92
Gain on sale of credit card portfolio.....................................       --              17,056          nm
Other.....................................................................        44,170         37,286      (15.59)
                                                                            -------------  -------------
  Total noninterest income................................................   $   342,627    $   399,949       16.73%
                                                                            -------------  -------------
                                                                            -------------  -------------
</TABLE>
 
- ------------------------
 
nm = not meaningful
 
    For the first nine months of 1997, noninterest income was $342.6 million,
compared with $399.9 million for the same period in 1998. This increase of $57.3
million, or 17 percent, includes the second quarter 1998 gain of $17.1 million
from the sale of the credit card portfolio, a $16.6 million increase in service
charges on deposit accounts, reflecting a 3 percent increase in average deposits
coupled with the expansion of several products and services, a $12.1 million
increase in trust and investment management
 
                                      S-28
<PAGE>
fees, largely due to growth of assets under management, a $4.9 million increase
in international commissions and fees, a $3.5 million increase in securities
gains, net, and a $6.8 million increase related to brokerage commissions and
merchant banking fees. In contrast, other noninterest income decreased $6.9
million, or 16 percent, due to a $7.7 million nonrecurring gain recognized in
1997 related to a real estate joint venture and the $2.9 million trading loss in
1998, partially offset by the $4.8 million gain recognized in the second quarter
of 1998 from the sale of commercial real estate loans.
 
    NONINTEREST EXPENSE
 
<TABLE>
<CAPTION>
                                                                                    FOR THE NINE MONTHS ENDED
                                                                            -----------------------------------------
                                                                            SEPTEMBER 30,  SEPTEMBER 30,    PERCENT
                                                                                1997           1998         CHANGE
                                                                            -------------  -------------  -----------
                                                                                     (DOLLARS IN THOUSANDS)
<S>                                                                         <C>            <C>            <C>
Salaries and other compensation...........................................   $   337,401    $   369,715         9.58%
Employee benefits.........................................................        81,569         89,877        10.19
                                                                            -------------  -------------
  Personnel-related expense...............................................       418,970        459,592         9.70
Net occupancy.............................................................        64,133         67,294         4.93
Equipment.................................................................        41,206         41,842         1.54
Merchant transaction processing...........................................        31,269         33,008         5.56
Communications............................................................        31,135         31,515         1.22
Professional services.....................................................        19,062         25,186        32.13
Advertising and public relations..........................................        20,759         22,419         8.00
Data processing...........................................................        19,115         20,462         7.05
Printing and office supplies..............................................        17,646         19,112         8.31
Software..................................................................        12,358         14,536        17.62
Travel....................................................................        11,321         13,041        15.19
Intangible asset amortization.............................................        10,014         10,069         0.55
Armored car...............................................................         9,160          8,989        (1.87)
Foreclosed asset expense (income).........................................          (696)          (746)          nm
Merger and integration expense............................................         6,037        --                nm
Other.....................................................................        50,719         69,859        37.74
                                                                            -------------  -------------
  Total noninterest expense...............................................   $   762,208    $   836,178         9.70%
                                                                            -------------  -------------
                                                                            -------------  -------------
</TABLE>
 
- ------------------------
 
nm = not meaningful
 
    Noninterest expense was $762.2 million for the first nine months of 1997,
compared with $836.2 million for the first nine months of 1998, an increase of
$74.0 million, or 10 percent. Personnel-related expense increased $40.6 million,
or 10 percent, primarily due to a $16.7 million increase in performance-based
incentive compensation, a 4 percent increase in the workforce, to support
increased revenue growth, and a $4.8 million increase in benefits expense
arising from a loss in the fair value of assets underlying postretirement
benefit plans. Professional services increased $6.1 million, or 32 percent, due
to additional costs related to the year 2000 effort. In addition, other
noninterest expense increased $19.1 million, primarily attributable to
additional expenses incurred to support higher deposit volumes.
 
    We continue to make preparations for the year 2000. (For a detailed
discussion of our year 2000 program see page S-63). The total cost of our year
2000 project is estimated to be approximately $50 million, of which $10 million
relates to capital expenditures which we will capitalize and depreciate over
their useful lives. The remaining $40 million will be included in noninterest
expense in the period incurred. As of September 30, 1998, we had spent $19
million on our year 2000 project, $2 million and $17 million in 1997 and 1998,
respectively. Of the $19 million spent as of September 30, 1998, $6 million
relates to capital expenditures, $1 million and $5 million in 1997 and 1998,
respectively. Of the estimated $31 million
 
                                      S-29
<PAGE>
remaining to be spent, an estimated $4 million is for capital expenditures. The
cost of the year 2000 project is being funded by normal operating cash and
staffed by external resources as well as internal staff re-deployed from less
time-sensitive assignments. Estimated total cost could change further as
analysis continues.
 
    The combination of Union Bank and BanCal Tri-State Corporation on April 1,
1996 resulted in the recording of a total of $123.5 million in merger and
integration expense. The remaining liability balance at September 30, 1998 was
$10.6 million. The balance includes amounts primarily for lease payments that
are continuing over the expected term of the leases. Merger and integration
expense of $6.0 million was recorded for the first nine months of 1997, compared
with none for the first nine months of 1998.
 
    INCOME TAX EXPENSE
 
    The effective tax rate for the nine months ended September 30, 1997 was
reduced as a result of an after-tax refund from the State of California
Franchise Tax Board of $24.7 million in settlement of litigation, administration
and audit disputes covering the years 1975-1987. The effective tax rate for the
nine months ended September 30, 1997 was 35 percent. The effective tax rate for
the nine months ended September 30, 1998 was 29 percent. The decrease in the
effective tax rate for 1998 was the result of a reduction of California
franchise taxes for 1997 and 1998 from our ability to file California franchise
tax returns on a worldwide unitary basis, which incorporates the financial
results of The Bank of Tokyo-Mitsubishi and its worldwide affiliates. The total
reduction of $52.4 million, net of federal tax, was reflected in the third
quarter of 1998. Of this amount, $29 million related to the reversal of
previously accrued 1997 state income tax liabilities and $23.4 million related
to a lower state tax provision in 1998. Excluding these reductions, the
effective tax rates for all periods would have been 40 percent.
 
    At this time, we anticipate that we will continue to file our California
franchise tax return on the worldwide basis for 1999. Our anticipated 1999 tax
rate will be dependent on our proportionate share of The Bank of
Tokyo-Mitsubishi financial results for that year, and is expected to be within
the range of 35 to 40 percent.
 
                                      S-30
<PAGE>
    LOANS
 
    The following table shows loans outstanding by loan type.
 
<TABLE>
<CAPTION>
                                                                                          PERCENT CHANGE TO
                                                                                      SEPTEMBER 30, 1998 FROM:
                                                                                     ---------------------------
                                        SEPTEMBER 30,  DECEMBER 31,   SEPTEMBER 30,  SEPTEMBER 30,  DECEMBER 31,
                                            1997           1997           1998           1997           1997
                                        -------------  -------------  -------------  -------------  ------------
                                                                 (DOLLARS IN THOUSANDS)
<S>                                     <C>            <C>            <C>            <C>            <C>
Domestic:
  Commercial, financial and
    industrial........................  $  10,405,299  $  10,747,179  $  12,151,210         16.78%        13.06%
  Construction........................        312,318        293,333        420,267         34.56         43.27
  Mortgage:
    Residential.......................      2,966,326      2,961,233      2,742,451         (7.55)        (7.39)
    Commercial........................      2,851,838      2,951,807      2,980,371          4.51          0.97
                                        -------------  -------------  -------------
      Total mortgage..................      5,818,164      5,913,040      5,722,822         (1.64)        (3.22)
  Consumer:
    Installment.......................      2,075,065      2,090,752      2,026,441         (2.34)        (3.08)
    Home equity.......................      1,027,147        992,916        844,256        (17.81)       (14.97)
    Credit card and other lines of
      credit..........................        275,258        270,097       --                  nm            nm
                                        -------------  -------------  -------------
      Total consumer..................      3,377,470      3,353,765      2,870,697        (15.00)       (14.40)
  Lease financing.....................        863,745        874,860      1,013,772         17.37         15.88
                                        -------------  -------------  -------------
      Total loans in domestic
        offices.......................     20,776,996     21,182,177     22,178,768          6.75          4.70
Loans originated in foreign
  branches............................      1,520,728      1,559,231      1,319,077        (13.26)       (15.40)
                                        -------------  -------------  -------------
      Total loans.....................  $  22,297,724  $  22,741,408  $  23,497,845          5.38%         3.33%
                                        -------------  -------------  -------------
                                        -------------  -------------  -------------
</TABLE>
 
- ------------------------
 
nm = not meaningful
 
    Our lending activities are predominantly domestic, with such loans and
leases comprising 94 percent of the portfolio at September 30, 1998. Total loans
at September 30, 1998 were $23.5 billion, an increase of $756.4 million, or 3
percent, from December 31, 1997. The increase was primarily attributable to
growth in the commercial, financial and industrial loan portfolio, which
increased $1.4 billion from December 31, 1997, partly offset by the consumer
loan portfolio, which decreased $483.1 million.
 
    Commercial, financial and industrial loans represent the largest category in
the loan portfolio. These loans are extended principally to major corporations,
middle market businesses, and small businesses, with no industry concentration
exceeding 10 percent of total commercial, financial and industrial loans. At
year-end 1997 and September 30, 1998, the commercial, financial and industrial
loan portfolio was $10.7 billion, or 47 percent of total loans, and $12.2
billion, or 52 percent of total loans, respectively. The increase of $1.4
billion, or 13 percent, from year-end 1997 was primarily attributable to
continued growth in loans extended to large corporations.
 
    The construction loan portfolio totaled $293.3 million, or 1 percent of
total loans, at December 31, 1997, compared with $420.3 million, or 2 percent of
total loans, at September 30, 1998. This growth is primarily attributable to the
favorable California real estate market coupled with the continuing improvement
in the West Coast economy.
 
    Mortgage loans were $5.9 billion, or 26 percent of total loans, at December
31, 1997, compared with $5.7 billion, or 24 percent of total loans, at September
30, 1998. The mortgage loan portfolio consists of
 
                                      S-31
<PAGE>
loans on commercial and industrial projects and loans secured by one to four
family residential properties, primarily in California. Despite the sale of
$123.0 million in commercial real estate mortgages during the second quarter of
1998, commercial mortgage loans increased $28.6 million from December 31, 1997,
primarily attributable to the favorable California real estate market coupled
with the continuing improvement in the West Coast economy. Residential mortgage
loans decreased $218.8 million due to prepayments arising from the favorable
interest rate environment and to sales in the secondary market.
 
    Consumer loans totaled $3.4 billion, or 15 percent of total loans, at
December 31, 1997, compared with $2.9 billion, or 12 percent of total loans, at
September 30, 1998. The decrease of $483.1 million was attributable to the sale
of the $253.0 million credit card loan portfolio in April 1998, and to a
reduction in home equity loans as customers refinanced to take advantage of
favorable long-term, fixed rate mortgages.
 
    Lease financing totaled $874.9 million, or 4 percent of total loans, at
December 31, 1997, compared with $1 billion, or 4 percent of total loans, at
September 30, 1998.
 
    Loans originated in foreign branches totaled $1.6 billion, or 7 percent of
total loans, at December 31, 1997 and $1.3 billion, or 6 percent of total loans,
at September 30, 1998.
 
    CROSS-BORDER OUTSTANDINGS
 
    Our cross-border outstandings reflect certain additional economic and
political risks that are not reflected in domestic outstandings. These risks
include those arising from exchange rate fluctuations and restrictions on the
transfer of funds. The following table sets forth our cross-border outstandings
as of September 30, 1997, December 31, 1997, and September 30, 1998 for each
country where such outstandings exceeded 1 percent of total assets. The
cross-border outstandings were compiled based upon category and domicile of
ultimate risk and are comprised of balances with banks, trading account assets,
securities available for sale, securities purchased under resale agreements,
loans, accrued interest receivable, acceptances outstanding and investments with
foreign entities. The amounts outstanding for each country exclude local
currency outstandings. We do not have significant local currency outstandings to
the individual countries listed in the following table that are not hedged or
are not funded by local currency borrowings.
 
<TABLE>
<CAPTION>
                                                                                 PUBLIC      CORPORATIONS
                                                                  FINANCIAL      SECTOR        AND OTHER         TOTAL
                                                                INSTITUTIONS    ENTITIES       BORROWERS     OUTSTANDINGS
                                                                -------------  -----------  ---------------  -------------
                                                                                  (DOLLARS IN MILLIONS)
<S>                                                             <C>            <C>          <C>              <C>
September 30, 1997
  Japan.......................................................    $     939     $  --          $     403       $   1,342
  Korea.......................................................          691            36            293           1,020
 
December 31, 1997
  Japan.......................................................          401        --                438             839
  Korea.......................................................          561            10            257             828
  Thailand....................................................          320        --             --                 320
 
September 30, 1998
  Japan.......................................................          115        --                469             584
  Korea.......................................................          376        --                139             515
</TABLE>
 
    The economic condition and the ability of some countries, to which we have
cross-border exposure, to manage their external debt obligations have been
impacted by the Asian economic crisis which began in the second half of 1997.
The impact of the Asian crisis appears to be spreading to other global markets.
Our exposure in all affected countries continues to be short-term in nature and
substantially related to the finance of trade. Although the extent of risk will
vary from country to country, and institution to institution, these short-term
exposures are characterized by management to be in the low to moderate range.
 
                                      S-32
<PAGE>
    Cross-border exposures, other than those referred to in the table above,
include total outstandings as of September 30, 1998 of $133 million in Brazil.
 
    Since Japan is the second largest trading nation in the world, its
political, economic and financial markets situation is being closely monitored.
The situation in Japan is worsening and the depressed conditions in that country
are impacting other areas which are highly dependent on trade relations with it.
There is considerable concern that the United States is not immune to the
effects of the depressed economic conditions in Japan and to the Asian crisis.
Management is monitoring our portfolio accordingly.
 
    Although management cannot predict the ultimate impact of the global
financial crisis on our financial position and results of operations since much
depends on the effect of the stabilizing activities already under way,
management believes that the continuation of internal supervision, monitoring
and portfolio risk management practices will be effective in minimizing the
impact over and above that already identified. Increases in nonaccrual loans,
together with some related increases in charge-off activity, may occur as events
unfold.
 
    ALLOWANCE FOR CREDIT LOSSES
 
    The allowance for credit losses is maintained at a level considered
appropriate by management and is based on an ongoing assessment of risk in the
credit and lease portfolio, including commitments to provide financing. The
allowance is increased by the provision for credit losses, which is charged
against current period operating results, and is decreased by the amount of net
loans charged off during the period. In evaluating the adequacy of the allowance
for credit losses, management incorporates such factors as collateral value,
portfolio composition and concentration, and trends in local, national, and
international economic conditions and the related impact on the financial
strength of our borrowers. While the allowance is segmented by broad portfolio
categories to analyze its adequacy, the allowance is general in nature and is
available for the portfolio in its entirety. Although management believes that
the allowance for credit losses is adequate as of September 30, 1998, future
provisions will be subject to continuing evaluation of risk in the credit and
lease portfolio.
 
                                      S-33
<PAGE>
    The table below sets forth a reconciliation of changes in the allowance for
credit losses.
 
<TABLE>
<CAPTION>
                                                                                           FOR THE NINE MONTHS
                                                                                           ENDED SEPTEMBER 30,
                                                                                          ----------------------
                                                                                             1997        1998
                                                                                          ----------  ----------
                                                                                          (DOLLARS IN THOUSANDS)
<S>                                                                                       <C>         <C>
Balance, beginning of period............................................................  $  523,946  $  451,692
Loans charged off:
  Commercial, financial and industrial..................................................      40,618      21,966
  Construction..........................................................................         120           3
  Mortgage..............................................................................       4,481       4,992
  Consumer..............................................................................      38,864      24,206
  Lease financing.......................................................................       2,502       1,971
                                                                                          ----------  ----------
    Total loans charged off.............................................................      86,585      53,138
Recoveries of loans previously charged off:
  Commercial, financial and industrial..................................................      18,473      17,788
  Construction..........................................................................       9,054           3
  Mortgage..............................................................................       2,833       2,705
  Consumer..............................................................................      10,575      11,389
  Lease financing.......................................................................         284         273
                                                                                          ----------  ----------
    Total recoveries of loans previously charged off....................................      41,219      32,158
                                                                                          ----------  ----------
      Net loans charged off.............................................................      45,366      20,980
Provision for credit losses.............................................................      --          45,000
Transfer of reserve for trading account assets..........................................      --          (1,911)
Foreign translation adjustment and other net additions (deductions).....................        (126)        (84)
                                                                                          ----------  ----------
Balance, end of period..................................................................  $  478,454  $  473,717
                                                                                          ----------  ----------
                                                                                          ----------  ----------
Allowance for credit losses to total loans..............................................        2.15%       2.02%
Provision for credit losses to net loans charged off....................................          nm      214.49
Net loans charged off to average loans outstanding for the period(1)....................        0.28        0.12
</TABLE>
 
- ------------------------
 
(1) Annualized.
 
nm = not meaningful
 
    At September 30, 1997, our allowance for credit losses was $478.5 million,
or 2.15 percent of total loans, and 435.9 percent of total nonaccrual loans,
compared with an allowance for credit losses at September 30, 1998 of $473.7
million, or 2.02 percent of total loans, and 697.2 percent of total nonaccrual
loans.
 
    For the nine months ended September 30, 1997, we recorded no provision for
credit losses, compared with a $45.0 million provision for the nine months ended
September 30, 1998. Management considers a range of estimated credit losses
inherent in the portfolio when evaluating the adequacy of the allowance for
credit losses. Central to this process is the required reserve, an amount
calculated by applying historical loss factors to credit exposures. These
factors are based on loss experience, adjusted for significant factors that
affect the collectibility of the portfolio as of the evaluation date. Additional
amounts, which are unallocated, provide a margin of error for the required
reserve calculation. At September 30, 1998, the unallocated reserve is also
available to cover specific credit risks which are more difficult to quantify.
These risks, such as the weak economic indicators in the global markets, the
decline in oil prices, the potentially adverse impact on agriculture from "El
Nino," and the volatility in the debt and equity markets, add to the uncertainty
in estimating credit losses. When determining the need for a credit provision,
these factors, as well as the likelihood of loan charge-offs, are used.
 
                                      S-34
<PAGE>
    Net loans charged-off were $45.4 million and $21.0 million for the nine
months ended September 30, 1997 and 1998, respectively. Loans charged-off in
1998 decreased by $33.4 million primarily due to a $18.7 million decrease in
commercial, financial and industrial loans charged-off as portfolio quality
improved, and a $14.7 million decrease in consumer loans charged-off primarily
due to the sale of the credit card portfolio in April of 1998. Recoveries of
loans previously charged-off decreased by $9.1 million, and the percentage of
net loans charged-off to average loans decreased from 0.28 to 0.12 percent for
the nine months ended September 30, 1997 and 1998, respectively.
 
    In the third quarter 1998, we reclassified a $1.9 million previously
established reserve for credit losses related to interest rate derivatives and
foreign exchange contracts from the unallocated portion of the allowance for
credit losses. The reserve for derivative and foreign exchange contracts is
presented as an offset to trading account assets. Future changes in the reserve
as a result of changes in the positive replacement cost of those contracts will
be provided as an offset to trading gains and losses.
 
    We evaluate our loan portfolio for impairment as defined by SFAS No. 114,
"Accounting by Creditors for Impairment of a Loan", as amended. At December 31,
1997, total impaired loans were $108.4 million and the associated impairment
allowance was $9.4 million, compared with total impaired loans of $67.9 million
and an associated impairment allowance of $7.5 million at September 30, 1998.
 
    NONPERFORMING ASSETS
 
<TABLE>
<CAPTION>
                                                                       SEPTEMBER 30,  DECEMBER 31,  SEPTEMBER 30,
                                                                           1997           1997          1998
                                                                       -------------  ------------  -------------
                                                                                 (DOLLARS IN THOUSANDS)
<S>                                                                    <C>            <C>           <C>
Commercial, financial and industrial.................................   $    54,087    $   46,392    $    55,407
Construction.........................................................         4,579         4,071          4,377
Mortgage:
  Residential........................................................         1,133           954        --
  Commercial.........................................................        49,959        57,921          8,163
                                                                       -------------  ------------  -------------
    Total mortgage...................................................        51,092        58,875          8,163
                                                                       -------------  ------------  -------------
    Total nonaccrual loans...........................................       109,758       109,338         67,947
Foreclosed assets....................................................        23,216        20,471         13,452
                                                                       -------------  ------------  -------------
    Total nonperforming assets.......................................   $   132,974    $  129,809    $    81,399
                                                                       -------------  ------------  -------------
                                                                       -------------  ------------  -------------
Allowance for credit losses..........................................   $   478,454    $  451,692    $   473,717
                                                                       -------------  ------------  -------------
                                                                       -------------  ------------  -------------
Nonaccrual loans to total loans......................................          0.49%         0.48%          0.29%
Allowance for credit losses to nonaccrual loans......................        435.92        413.12         697.19
Nonperforming assets to total loans and foreclosed assets............          0.60          0.57           0.35
Nonperforming assets to total assets.................................          0.43          0.42           0.26
</TABLE>
 
    At September 30, 1998, nonperforming assets totaled $81.4 million, a
decrease of $48.4 million, or 37 percent, from December 31, 1997. The decrease
was primarily the result of reductions of $49.8 million in nonaccrual commercial
mortgage loans due to a combination of note sales, repayments and restorations
to accrual and $7.0 million in foreclosed assets due to sales of individual
assets.
 
    Nonaccrual loans as a percentage of total loans were 0.48 percent at
December 31, 1997, compared with 0.29 percent at September 30, 1998.
Nonperforming assets as a percentage of total loans and foreclosed assets were
0.57 percent at December 31, 1997, compared with 0.35 percent at September 30,
1998.
 
                                      S-35
<PAGE>
    LOANS 90 DAYS OR MORE PAST DUE AND STILL ACCRUING
 
<TABLE>
<CAPTION>
                                                                       SEPTEMBER 30,  DECEMBER 31,  SEPTEMBER 30,
                                                                           1997           1997          1998
                                                                       -------------  ------------  -------------
                                                                                 (DOLLARS IN THOUSANDS)
<S>                                                                    <C>            <C>           <C>
Commercial, financial and industrial.................................    $   3,682     $      450     $   1,403
Mortgage:
  Residential........................................................        9,606         10,170         9,223
  Commercial.........................................................        2,284          1,660           370
                                                                       -------------  ------------  -------------
    Total mortgage...................................................       11,890         11,830         9,593
Consumer and other...................................................       10,010          7,712         4,299
                                                                       -------------  ------------  -------------
  Total loans 90 days or more past due and still accruing............    $  25,582     $   19,992     $  15,295
                                                                       -------------  ------------  -------------
                                                                       -------------  ------------  -------------
</TABLE>
 
    REGULATORY CAPITAL
 
    The following table summarizes our risk-based capital, risk-weighted assets,
and risk-based capital ratios.
 
<TABLE>
<CAPTION>
                                                                                                          MINIMUM
                                                        SEPTEMBER 30,  DECEMBER 31,   SEPTEMBER 30,     REGULATORY
                                                            1997           1997           1998          REQUIREMENT
                                                        -------------  -------------  -------------  -----------------
                                                                            (DOLLARS IN THOUSANDS)
<S>                                                     <C>            <C>            <C>            <C>
CAPITAL COMPONENTS:
  Tier 1 capital......................................  $   2,520,589  $   2,587,071  $   2,876,605
  Tier 2 capital......................................        593,865        601,102        598,027
                                                        -------------  -------------  -------------
    Total risk-based capital..........................  $   3,114,454  $   3,188,173  $   3,474,632
                                                        -------------  -------------  -------------
  Risk-weighted assets................................  $  28,249,379  $  28,862,340  $  30,176,967
                                                        -------------  -------------  -------------
                                                        -------------  -------------  -------------
  Quarterly average assets............................  $  30,037,626  $  30,334,507  $  30,696,414
                                                        -------------  -------------  -------------
                                                        -------------  -------------  -------------
 
CAPITAL RATIOS:
  Total risk-based capital............................          11.02%         11.05%         11.51%           8.0%
  Tier 1 risk-based capital...........................           8.92           8.96           9.53            4.0
  Leverage ratio(1)...................................           8.39           8.53           9.37            4.0
</TABLE>
 
- ------------------------
 
(1) Tier 1 capital divided by quarterly average assets (excluding certain
    intangible assets).
 
    UNBC and its bank are subject to various regulations issued by Federal
banking agencies, including minimum capital requirements. UNBC and its bank are
required to maintain minimum ratios of total and Tier 1 capital to risk-weighted
assets and of Tier 1 capital to average assets (the leverage ratio).
 
    Compared with December 31, 1997, our Tier 1 risk-based capital ratio at
September 30, 1998 increased 57 basis points to 9.53 percent, the total
risk-based capital ratio increased 46 basis points to 11.51 percent, and the
leverage ratio increased 84 basis points to 9.37 percent. The increase in the
capital ratios was primarily attributable to retained earnings growing faster
than both risk-weighted assets and average assets, partly offset by the
reduction of $50.0 million in subordinated capital notes.
 
    As of September 30, 1998, management believes the capital ratios of our bank
met all regulatory minimums of a "well-capitalized" institution.
 
                                      S-36
<PAGE>
YEAR ENDED DECEMBER 31, 1997 COMPARED TO YEAR ENDED DECEMBER 31, 1996
 
    To facilitate the discussion of the results of operations, the Summary
Consolidated Financial and Operating Data table on page S-11 and the Selected
Consolidated Financial and Operating Data table on page S-22 include certain pro
forma earnings disclosures and ratios. These presentations supplement the
Consolidated Statements of Income on page F-2 (which are prepared in accordance
with generally accepted accounting principles), primarily with respect to the
treatment of merger and integration expense. We believe that it is meaningful to
understand the operating results and trends excluding these expenses and,
therefore, have included information in the tables referred to above and in the
MD&A which follows, that presents income before merger and integration expense
and income taxes and related pro forma ratio and per share calculations.
 
    SUMMARY
 
    Net income in 1997 was $411 million, including $4 million (after-tax) of
merger and integration related expense. Net income in 1996 was $249 million,
including $72 million (after-tax) of merger and integration related expense. Net
income applicable to common stock was $404 million, or $2.30 per diluted common
share, in 1997 compared with $238 million, or $1.36 per diluted common share, in
1996. Excluding after-tax merger and integration expense, pro forma earnings for
1997 were $415 million, an increase of 29 percent from $321 million a year
earlier. Pro forma earnings applicable to common stock were $407 million, or
$2.32 per diluted common share, in 1997 compared with $310 million, or $1.77 per
diluted common share, in 1996. This increase of 31 percent over the comparable
figures for 1996 was due to a 5 percent increase in net interest income, an 11
percent increase in noninterest income, a decrease in the effective income tax
rate, and a $40 million reduction in the provision for credit losses, partially
offset by a 2 percent increase in noninterest expense (excluding merger and
integration expense). Other highlights for 1997 include:
 
    - Net interest income, on a taxable-equivalent basis, was $1,237 million in
      1997, an increase of $62 million, or 5 percent, over 1996 primarily due to
      a $1.6 billion, or 6 percent, increase in average earning assets,
      resulting primarily from a $1.1 billion, or 5 percent, increase in average
      loans and largely funded by an $851 million, or 13 percent, increase in
      average demand deposits. Partially offsetting the positive impact of the
      growth in earning assets and demand deposits on net interest income was a
      5 basis point decline in the net interest margin to 4.70%. The decline in
      net interest margin was primarily due to a 14 basis point decrease in the
      spread between the average yield on earning assets and the average rate
      paid on interest bearing liabilities.
 
    - No provision for credit losses was recorded in 1997 compared with $40
      million in 1996, reflecting improvement in the quality of our loan
      portfolio and a reduction in nonaccrual loans. Nonperforming assets
      declined $27 million, or 17 percent, from December 31, 1996 to $130
      million at December 31, 1997. Nonperforming assets as a percent of total
      assets declined to 0.42% at December 31, 1997 compared with 0.54% a year
      earlier. Total nonaccrual loans were $109 million at December 31, 1997
      compared with $128 million at year-end 1996, resulting in a reduction in
      the ratio of nonaccrual and renegotiated loans to total loans from 0.61%
      at December 31, 1996 to 0.48% at year-end 1997. The allowance for credit
      losses was $452 million, or 413% of total nonaccrual loans, at December
      31, 1997 compared with $524 million, or 408% of total nonaccrual loans, at
      December 31, 1996.
 
    - Noninterest income was $463 million in 1997, an increase of $44 million,
      or 11 percent, over 1996. Service charges on deposit accounts grew $13
      million, or 12 percent, reflecting growth in deposit balances while trust
      and investment management fees increased $14 million, or 15 percent, on
      growth in trust accounts and assets under management.
 
    - Excluding merger and integration expense, noninterest expense was $1,039
      million in 1997, an increase of $21 million, or 2 percent, over 1996. This
      increase was primarily attributable to an
 
                                      S-37
<PAGE>
      increase of $14 million, or 3 percent, in personnel-related expense, a
      significant portion of which was due to severance payments related to
      realignment of departments and to higher performance-related incentive
      compensation, and an increase of $14 million, or 25 percent, in other
      expenses. These increases were partially offset by a decline of $18
      million in net occupancy expense, reflecting a $12 million charge recorded
      in 1996 related to former banking facilities, as well as merger
      efficiencies realized in 1997. Excluding the $12 million charge in 1996
      and merger and integration expense, noninterest expense increased $33
      million over 1996.
 
    - The effective tax rate for 1997 was 37% compared with 40% for 1996.
      Excluding the $25 million after-tax refund from the State of California
      Franchise Tax Board, the effective tax rate in 1997 was 41%. Excluding a
      $5 million after-tax benefit from the settlement of a unitary tax issue
      with the State of California Franchise Tax Board, the effective tax rate
      in 1996 was also 41%.
 
    - The return on average assets for 1997 increased to 1.39% compared to 0.89%
      for 1996. Excluding the after-tax effect of merger and integration
      expense, the pro forma return on average assets was 1.40% for 1997
      compared to 1.15% for 1996. The return on average common equity for 1997
      was 16.05% compared to 10.24% for 1996. Excluding the after-tax effect of
      merger and integration expense, the pro forma return on average common
      equity was 16.20% for 1997 compared to 13.33% for 1996.
 
    - Total loans at December 31, 1997 were $22.7 billion, an increase of $1.7
      billion, or 8 percent, over year-end 1996, primarily from growth in the
      commercial, financial and industrial loan portfolio.
 
    - At December 31, 1997, our Tier 1 risk-based capital ratio was 8.96% and
      the total risk-based capital ratio was 11.05%, exceeding the minimum
      regulatory guidelines for bank holding companies of 4% and 8%,
      respectively. The Tier 1 and total risk-based capital ratios for our bank
      at December 31, 1997 exceeded the regulatory guidelines for
      "well-capitalized" banks. Our leverage ratio was 8.53% at December 31,
      1997, exceeding the minimum regulatory guideline for bank holding
      companies.
 
                                      S-38
<PAGE>
    NET INTEREST INCOME
 
    The table below shows the major components of net interest income and net
interest margin.
<TABLE>
<CAPTION>
                                                                  YEARS ENDED DECEMBER 31,
                                   --------------------------------------------------------------------------------------
                                                   1995                                  1996                     1997
                                   ------------------------------------  ------------------------------------  ----------
                                                INTEREST      AVERAGE                 INTEREST      AVERAGE
                                    AVERAGE      INCOME/      YIELD/      AVERAGE      INCOME/      YIELD/      AVERAGE
                                    BALANCE    EXPENSE(1)     RATE(1)     BALANCE    EXPENSE(1)     RATE(1)     BALANCE
                                   ----------  -----------  -----------  ----------  -----------  -----------  ----------
                                                                   (DOLLARS IN THOUSANDS)
<S>                                <C>         <C>          <C>          <C>         <C>          <C>          <C>
ASSETS:
  Loans: (2)
    Domestic.....................  $17,783,993  $1,540,694        8.66%  $19,328,752  $1,604,799        8.30%  $20,332,494
    Foreign(3)...................   1,190,547      76,723         6.44    1,398,825      84,693         6.05    1,523,417
  Securities -- taxable(4).......   2,055,504     120,210         5.85    2,138,282     133,170         6.23    2,521,339
  Securities -- tax-exempt(4)....     185,934      18,984        10.21      151,970      15,451        10.17      124,174
  Interest bearing deposits in
    banks........................     930,999      58,201         6.25      911,575      52,709         5.78      968,966
  Federal funds sold and
    securities purchased under
    resale agreements............     368,684      22,247         6.03      547,547      30,246         5.52      466,321
  Trading account assets.........     333,468      20,578         6.17      240,375      12,960         5.39      355,111
                                   ----------  -----------               ----------  -----------               ----------
      Total earning assets.......  22,849,129   1,857,637         8.13   24,717,326   1,934,028         7.82   26,291,822
                                               -----------                           -----------
  Allowance for credit losses....    (573,648)                             (544,806)                             (503,126)
  Cash and due from banks........   1,617,715                             1,926,050                             2,006,038
  Premises and equipment, net....     411,794                               425,943                               411,302
  Other assets...................   1,259,853                             1,375,221                             1,486,956
                                   ----------                            ----------                            ----------
      Total assets...............  $25,564,843                           $27,899,734                           $29,692,992
                                   ----------                            ----------                            ----------
                                   ----------                            ----------                            ----------
LIABILITIES:
  Domestic deposits:
    Interest bearing.............  $4,955,750     129,860         2.62   $5,001,060     135,821         2.72   $5,340,661
    Savings and consumer time....   2,738,588      99,215         3.62    2,837,198     105,350         3.71    2,970,370
    Large time...................   2,474,685     128,974         5.21    4,095,222     218,959         5.35    4,652,293
  Foreign deposits(3)............   1,806,820      96,109         5.32    1,504,067      71,437         4.75    1,589,303
                                   ----------  -----------               ----------  -----------               ----------
      Total interest bearing
        deposits.................  11,975,843     454,158         3.79   13,437,547     531,567         3.96   14,552,627
                                   ----------  -----------               ----------  -----------               ----------
  Federal funds purchased and
    securities sold under
    repurchase agreements........   1,384,762      78,908         5.70      933,433      47,095         5.05    1,097,707
  Subordinated capital notes.....     615,868      42,538         6.91      458,966      30,104         6.56      354,575
  Commercial paper...............   1,448,739      86,695         5.98    1,620,087      87,411         5.40    1,637,070
  Other borrowed funds...........     731,759      42,561         5.82    1,119,051      62,549         5.59      635,900
                                   ----------  -----------               ----------  -----------               ----------
      Total borrowed funds.......   4,181,128     250,702         6.00    4,131,537     227,159         5.50    3,725,252
                                   ----------  -----------               ----------  -----------               ----------
      Total interest bearing
        liabilities..............  16,156,971     704,860         4.36   17,569,084     758,726         4.32   18,277,879
                                               -----------                           -----------
  Demand deposits................   5,994,129                             6,663,997                             7,514,528
  Other liabilities..............   1,081,267                             1,206,216                             1,295,728
                                   ----------                            ----------                            ----------
      Total liabilities..........  23,232,367                            25,439,297                            27,088,135
SHAREHOLDER'S EQUITY:
  Preferred stock................     135,000                               135,000                                90,247
  Common equity(5)...............   2,197,476                             2,325,437                             2,514,610
                                   ----------                            ----------                            ----------
      Total shareholders'
        equity...................   2,332,476                             2,460,437                             2,604,857
                                   ----------                            ----------                            ----------
      Total liabilities and
        shareholders' equity.....  $25,564,843                           $27,899,734                           $29,692,992
                                   ----------                            ----------                            ----------
                                   ----------                            ----------                            ----------
Net interest income/margin
  (taxable-equivalent basis).....               1,152,777         5.05%               1,175,302         4.75%
Less: taxable-equivalent
  adjustment.....................                  10,444                                 6,724
                                               -----------                           -----------
Net interest income..............               $1,142,333                            $1,168,578
                                               -----------                           -----------
                                               -----------                           -----------
 
<CAPTION>
 
                                    INTEREST      AVERAGE
                                     INCOME/      YIELD/
                                   EXPENSE(1)     RATE(1)
                                   -----------  -----------
 
<S>                                <C>          <C>
ASSETS:
  Loans: (2)
    Domestic.....................   $1,672,006        8.22%
    Foreign(3)...................      92,420         6.07
  Securities -- taxable(4).......     158,950         6.30
  Securities -- tax-exempt(4)....      12,669        10.20
  Interest bearing deposits in
    banks........................      56,748         5.86
  Federal funds sold and
    securities purchased under
    resale agreements............      26,079         5.59
  Trading account assets.........      19,917         5.61
                                   -----------
      Total earning assets.......   2,038,789         7.75
                                   -----------
  Allowance for credit losses....
  Cash and due from banks........
  Premises and equipment, net....
  Other assets...................
 
      Total assets...............
 
LIABILITIES:
  Domestic deposits:
    Interest bearing.............     151,768         2.84
    Savings and consumer time....     112,808         3.80
    Large time...................     256,007         5.50
  Foreign deposits(3)............      75,398         4.74
                                   -----------
      Total interest bearing
        deposits.................     595,981         4.10
                                   -----------
  Federal funds purchased and
    securities sold under
    repurchase agreements........      58,544         5.33
  Subordinated capital notes.....      22,850         6.44
  Commercial paper...............      89,912         5.49
  Other borrowed funds...........      34,492         5.42
                                   -----------
      Total borrowed funds.......     205,798         5.52
                                   -----------
      Total interest bearing
        liabilities..............     801,779         4.39
                                   -----------
  Demand deposits................
  Other liabilities..............
 
      Total liabilities..........
SHAREHOLDER'S EQUITY:
  Preferred stock................
  Common equity(5)...............
 
      Total shareholders'
        equity...................
 
      Total liabilities and
        shareholders' equity.....
 
Net interest income/margin
  (taxable-equivalent basis).....   1,237,010         4.70%
Less: taxable-equivalent
  adjustment.....................       5,328
                                   -----------
Net interest income..............   $1,231,682
                                   -----------
                                   -----------
</TABLE>
 
- ----------------------------------
(1) Yields and interest income are presented on a taxable-equivalent basis using
    the federal statutory tax rate of 35 percent.
 
(2) Average balances on loans outstanding include all nonperforming and
    renegotiated loans. The amortized portion of net loan origination fees
    (costs) is included in interest income on loans, representing an adjustment
    to the yield.
 
(3) Foreign loans and deposits are those loans and deposits originated in
    foreign branches.
 
(4) Yields on securities available for sale were based on fair value. The
    difference between these yields and those based on amortized cost was not
    significant.
 
(5) Amounts restated to give retroactive effect to the exchange referred to in
    Note 1 of the accompanying Notes to Consolidated Financial Statements.
 
                                      S-39
<PAGE>
    Net interest income is interest earned on loans and investments less
interest expense on deposit accounts and borrowings. Primary factors affecting
the level of net interest income include the margin between the yield earned on
interest earning assets and the rate paid on interest bearing liabilities, as
well as the volume and composition of average interest earning assets and
average interest bearing liabilities.
 
    Excluding the provision for credit losses, net interest income on a
taxable-equivalent basis was $1,175 million in 1996, compared with $1,237
million in 1997. The increase of $62 million, or 5 percent, was primarily
attributable to a $1.6 billion, or 6 percent, increase in average earning assets
largely funded by an $851 million, or 13 percent, increase in average demand
deposits. Partially offsetting the positive impact of the growth in earning
assets and demand deposits on net interest income was a 5 basis point decline in
the net interest margin to 4.70%, primarily as a result of both a 14 basis point
increase in the cost of interest bearing deposits due to a 25 basis point
increase in the Federal Funds rate in March 1997, and a decrease in the average
yield on domestic loans of 8 basis points.
 
    Average earning assets were $24.7 billion in 1996 compared with $26.3
billion in 1997. This growth was primarily attributable to a $1.1 billion, or 5
percent, increase in average loans and a $355 million, or 16 percent, increase
in average securities. Average commercial, financial and industrial loans, which
increased $582 million, and average commercial mortgage loans, which increased
$437 million, contributed most of the loan growth. See "Loans" at page S-46 for
additional commentary on loan portfolio growth. The increase in primarily fixed
rate securities reflected interest rate risk management actions to reduce our
exposure to declines in interest rates.
 
    The $1.6 billion, or 6 percent, increase in average earning assets over 1996
was primarily funded by increases in average demand deposits and average
interest bearing core deposits. Increases in these categories were: demand
deposits $851 million, or 13 percent; interest bearing domestic deposits $340
million, or 7 percent; and savings and consumer time deposits $133 million, or 5
percent. The increase in demand deposits in 1997 was partially due to an influx
of new customer relationships, arising from the recent merger and acquisition
activities of other financial institutions in the California market during the
year.
 
                                      S-40
<PAGE>
    ANALYSIS OF CHANGES IN NET INTEREST INCOME
 
    The following table shows the changes in the components of net interest
income on a taxable-equivalent basis. The changes in net interest income between
periods have been reflected as attributable either to volume or rate changes.
For purposes of this table, changes which are not solely due to volume or rate
changes are allocated to rate.
 
<TABLE>
<CAPTION>
                                                                           YEARS ENDED DECEMBER 31,
                                                    ----------------------------------------------------------------------
                                                             1996 VERSUS 1995                    1997 VERSUS 1996
                                                    ----------------------------------  ----------------------------------
                                                    INCREASE (DECREASE) DUE TO CHANGE       INCREASE (DECREASE) DUE TO
                                                                    IN                              CHANGE IN
                                                    ----------------------------------  ----------------------------------
                                                     AVERAGE     AVERAGE                 AVERAGE     AVERAGE       NET
                                                      VOLUME       RATE     NET CHANGE    VOLUME       RATE       CHANGE
                                                    ----------  ----------  ----------  ----------  ----------  ----------
                                                                            (DOLLARS IN THOUSANDS)
<S>                                                 <C>         <C>         <C>         <C>         <C>         <C>
CHANGES IN INTEREST INCOME:
  Loans:
    Domestic......................................  $  133,776  $  (69,671) $   64,105  $   83,311  $  (16,104) $   67,207
    Foreign(1)....................................      13,413      (5,443)      7,970       7,538         189       7,727
  Securities -- taxable...........................       4,843       8,117      12,960      23,856       1,924      25,780
  Securities -- tax-exempt........................      (3,468)        (65)     (3,533)     (2,826)         44      (2,782)
  Interest bearing deposits in banks..............      (1,214)     (4,278)     (5,492)      3,317         722       4,039
  Federal funds sold and securities purchased
    under resale agreements.......................      10,785      (2,786)      7,999      (4,484)        317      (4,167)
  Trading account assets..........................      (5,744)     (1,874)     (7,618)      6,184         773       6,957
                                                    ----------  ----------  ----------  ----------  ----------  ----------
      Total earning assets........................     152,391     (76,000)     76,391     116,896     (12,135)    104,761
                                                    ----------  ----------  ----------  ----------  ----------  ----------
CHANGES IN INTEREST EXPENSE:
  Domestic deposits:
    Interest bearing..............................       1,187       4,774       5,961       9,237       6,710      15,947
    Savings and consumer time.....................       3,572       2,563       6,135       4,941       2,517       7,458
    Large time....................................      84,458       5,527      89,985      29,803       7,245      37,048
  Foreign deposits(1).............................     (16,104)     (8,568)    (24,672)      4,049         (88)      3,961
                                                    ----------  ----------  ----------  ----------  ----------  ----------
      Total interest bearing deposits.............      73,113       4,296      77,409      48,030      16,384      64,414
                                                    ----------  ----------  ----------  ----------  ----------  ----------
  Federal funds purchased and securities sold
    under repurchase agreements...................     (25,718)     (6,095)    (31,813)      8,296       3,153      11,449
  Subordinated capital notes......................     (10,837)     (1,597)    (12,434)     (6,848)       (406)     (7,254)
  Commercial paper................................      10,254      (9,538)        716         916       1,585       2,501
  Other borrowed funds............................      22,526      (2,538)     19,988     (27,006)     (1,051)    (28,057)
                                                    ----------  ----------  ----------  ----------  ----------  ----------
      Total borrowed funds........................      (3,775)    (19,768)    (23,543)    (24,642)      3,281     (21,361)
                                                    ----------  ----------  ----------  ----------  ----------  ----------
      Total interest bearing liabilities..........      69,338     (15,472)     53,866      23,388      19,665      43,053
                                                    ----------  ----------  ----------  ----------  ----------  ----------
      Changes in net interest income..............  $   83,053  $  (60,528) $   22,525  $   93,508  $  (31,800) $   61,708
                                                    ----------  ----------  ----------  ----------  ----------  ----------
                                                    ----------  ----------  ----------  ----------  ----------  ----------
</TABLE>
 
- ------------------------
 
(1) Foreign loans and deposits are those loans and deposits originated in
    foreign branches.
 
    Interest income on a taxable-equivalent basis increased $105 million in
1997, primarily due to growth in interest income from domestic loans and
securities, which reflected higher average balances outstanding, partially
offset by a lower average yield primarily on domestic loans.
 
    Interest expense increased $43 million in 1997 due to higher interest
expense on interest bearing deposits, primarily reflecting higher average
deposit balances and higher average rates. Interest expense on
 
                                      S-41
<PAGE>
borrowed funds declined $21 million in 1997, reflecting lower volumes, offset by
a 2 basis point increase in the average rate paid.
 
    NONINTEREST INCOME
 
<TABLE>
<CAPTION>
                                                                                       INCREASE (DECREASE)
                                                                          ----------------------------------------------
                                                                                     YEARS ENDED DECEMBER 31,
                                                                          ----------------------------------------------
                                           YEARS ENDED DECEMBER 31,          1996 VERSUS 1995        1997 VERSUS 1996
                                      ----------------------------------  ----------------------  ----------------------
                                         1995        1996        1997      AMOUNT      PERCENT     AMOUNT      PERCENT
                                      ----------  ----------  ----------  ---------  -----------  ---------  -----------
                                                                    (DOLLARS IN THOUSANDS)
<S>                                   <C>         <C>         <C>         <C>        <C>          <C>        <C>
Service charges on deposit
  accounts..........................  $   95,177  $  101,975  $  114,647  $   6,798           7%  $  12,672          12%
Trust and investment management
  fees..............................      87,743      93,479     107,527      5,736           7      14,048          15
International commissions and
  fees..............................      68,621      66,108      66,122     (2,513)         (4)         14      --
Credit card merchant fees...........      45,767      49,778      57,128      4,011           9       7,350          15
Merchant banking fees...............      24,483      23,929      24,924       (554)         (2)        995           4
Foreign exchange trading gains,
  net...............................      19,043      13,255      16,268     (5,788)        (30)      3,013          23
Brokerage commissions and fees......       9,270      12,932      15,569      3,662          40       2,637          20
Securities gains (losses), net......        (702)      4,502       2,711      5,204      nm          (1,791)        (40)
Other...............................      45,917      52,718      58,105      6,801          15       5,387          10
                                      ----------  ----------  ----------  ---------               ---------
    Total noninterest income........  $  395,319  $  418,676  $  463,001  $  23,357           6%  $  44,325          11%
                                      ----------  ----------  ----------  ---------               ---------
                                      ----------  ----------  ----------  ---------               ---------
</TABLE>
 
- ------------------------
 
nm = not meaningful
 
    Noninterest income in 1997 was $463 million, an increase of $44 million, or
11 percent, over 1996. This included a $13 million increase in revenue from
service charges on deposit accounts, a $14 million increase in trust and
investment management fees, a $7 million increase in credit card merchant fees,
a $3 million increase in foreign exchange trading gains, net, a $3 million
increase in brokerage commissions and fees, and a $5 million increase in other
noninterest income, partially offset by a $2 million decrease in securities
gains, net.
 
    Revenue from service charges on deposit accounts was $115 million in 1997,
an increase of 12 percent over 1996. The increase was primarily attributable to
an increase in the volume of non-credit services provided.
 
    Trust and investment management fees were $108 million in 1997, 15 percent
higher than in 1996, primarily due to an increase in assets under management,
which resulted in higher mutual fund management fees and personal trust fees.
 
    Credit card merchant fees were $57 million in 1997, an increase of 15
percent over 1996. The increase was primarily due to an increase in the volume
of credit card drafts deposited by merchants.
 
    Foreign exchange trading gains, net increased $3 million, or 23 percent, in
1997, primarily due to more volatility in the foreign exchange markets in 1997.
 
    Brokerage commissions and fees were $16 million in 1997, an increase of 20
percent over 1996. The increase was primarily attributable to brokerage
commissions on non-proprietary mutual fund sales.
 
    Other noninterest income in 1997 was $5 million, or 10 percent, higher than
in 1996. Included in other noninterest income in 1997 was an $8 million gain
related to a real estate joint venture, compared with
 
                                      S-42
<PAGE>
gains of $2 million related to a real estate joint venture and $2 million
related to a non-recurring insurance refund recognized in 1996.
 
    NONINTEREST EXPENSE
 
<TABLE>
<CAPTION>
                                                                                         INCREASE (DECREASE)
                                                                          -------------------------------------------------
                                                                                      YEARS ENDED DECEMBER 31,
                                                                          -------------------------------------------------
                                         YEARS ENDED DECEMBER 31,                1996/1995                1997/1996
                                  --------------------------------------  -----------------------  ------------------------
                                     1995         1996          1997        AMOUNT      PERCENT      AMOUNT       PERCENT
                                  ----------  ------------  ------------  ----------  -----------  -----------  -----------
                                                                   (DOLLARS IN THOUSANDS)
<S>                               <C>         <C>           <C>           <C>         <C>          <C>          <C>
Salaries and other
  compensation..................  $  432,581  $    448,793  $    461,915  $   16,212           4%  $    13,122           3%
Employee benefits...............     104,090       108,454       109,729       4,364           4         1,275           1
                                  ----------  ------------  ------------  ----------               -----------
  Personnel-related expense.....     536,671       557,247       571,644      20,576           4        14,397           3
Net occupancy...................      92,863       103,335        85,630      10,472          11       (17,705)        (17)
Equipment.......................      55,056        55,942        56,137         886           2           195          --
Communications..................      35,806        40,133        42,372       4,327          12         2,239           6
Credit card processing..........      31,288        37,091        42,274       5,803          19         5,183          14
Advertising and public
  relations.....................      20,911        28,788        28,664       7,877          38          (124)         --
Professional services...........      26,197        24,342        28,075      (1,855)         (7)        3,733          15
Data processing.................      18,557        22,140        25,973       3,583          19         3,833          17
Printing and office supplies....      22,626        27,085        24,098       4,459          20        (2,987)        (11)
Software........................      13,839        15,895        16,562       2,056          15           667           4
Travel..........................      12,183        14,936        15,763       2,753          23           827           6
Intangible asset
  amortization..................      13,353        13,335        13,352         (18)     --                17      --
Armored car.....................      13,792        13,296        12,209        (496)         (4)       (1,087)         (8)
Regulatory authority
  assessments...................      23,431         4,048         5,778     (19,383)        (83)        1,730          43
Foreclosed asset expense
  (income)......................      (3,213)        2,889        (1,268)      6,102      nm            (4,157)     nm
Other...........................      64,741        56,938        71,365      (7,803)        (12)       14,427          25
                                  ----------  ------------  ------------  ----------               -----------
  Noninterest expense, excluding
    merger and integration
    expense.....................     978,101     1,017,440     1,038,628      39,339           4        21,188           2
Merger and integration
  expense.......................      --           117,464         6,037     117,464      nm          (111,427)        (95)
                                  ----------  ------------  ------------  ----------               -----------
    Total noninterest expense...  $  978,101  $  1,134,904  $  1,044,665  $  156,803          16 % $   (90,239)         (8)%
                                  ----------  ------------  ------------  ----------               -----------
                                  ----------  ------------  ------------  ----------               -----------
</TABLE>
 
- ------------------------
 
nm = not meaningful
 
    Noninterest expense, excluding merger and integration expense, was $1,039
million in 1997, an increase of $21 million, or 2 percent, over 1996. This
included a $14 million increase in personnel-related expense, a $5 million
increase in credit card processing expense, a $4 million increase in data
processing expense, and a $14 million increase in other noninterest expense,
partially offset by an $18 million decrease in net occupancy expense and a $4
million decrease in foreclosed asset expense.
 
                                      S-43
<PAGE>
    Personnel-related expense was $572 million in 1997, an increase of $14
million, or 3 percent, compared to 1996. This increase was primarily due to the
increase in salaries and other compensation expense, a significant portion of
which was due to severance payments related to realignment of departments and to
higher performance-related incentive compensation.
 
    Credit card processing expense was $42 million in 1997, an increase of $5
million, or 14 percent, over 1996 due to higher merchant volumes.
 
    Data processing expense was $26 million in 1997, an increase of $4 million,
or 17 percent, over 1996 due to increased activity in data processing systems
supporting the growth in deposits.
 
    Other noninterest expense increased $14 million in 1997. Of the total
increase, $7.5 million reflected additional expenses incurred to support higher
deposit volumes.
 
    Net occupancy expense was $86 million in 1997, $18 million, or 17 percent,
lower than the previous year. The decrease in net occupancy expense was
primarily due to a $12 million charge related to former banking facilities in
1996. Excluding this charge, net occupancy expense in 1997 declined 6 percent
due to merger-related efficiencies realized in 1997.
 
    Foreclosed asset expense decreased $4 million in 1997. The decrease was
primarily due to lower writedowns and maintenance and selling expenses,
reflecting a 28 percent reduction in the portfolio of foreclosed assets.
 
    MERGER AND INTEGRATION EXPENSE
 
    Merger and integration expense of $124 million in total was recorded in 1996
and 1997 to cover $38 million of personnel expense for severance, retention and
other employee related costs, $54 million for facilities expense related to
redundant banking facilities and $32 million in professional services and other
expense as a result of the combination of Union Bank and BanCal Tri-State
Corporation.
 
    The following table presents merger and integration expense provisions in
1996 and 1997, the cash and noncash utilization of those expense provisions
during the periods, and the resulting liability balances as of December 31, 1996
and 1997.
 
<TABLE>
<CAPTION>
                                                                                                  YEARS ENDED
                                                                                                 DECEMBER 31,
                                                                                             ---------------------
                                                                                                1996       1997
                                                                                             ----------  ---------
                                                                                                  (DOLLARS IN
                                                                                                  THOUSANDS)
<S>                                                                                          <C>         <C>
Balance, accrued merger and integration expense, beginning of period.......................  $   --      $  54,344
Provision for merger and integration costs.................................................     117,464      6,037
Utilization for the period:
  Cash.....................................................................................      40,155     35,809
  Noncash..................................................................................      22,965      1,642
                                                                                             ----------  ---------
    Total utilization......................................................................      63,120     37,451
                                                                                             ----------  ---------
Balance, accrued merger and integration expense, end of period.............................  $   54,344  $  22,930
                                                                                             ----------  ---------
                                                                                             ----------  ---------
</TABLE>
 
    At December 31, 1997, the liability balance included amounts primarily for
severance payments that are being paid on a periodic basis and for lease
payments that are continuing over the expected term of the leases.
 
                                      S-44
<PAGE>
    INCOME TAX EXPENSE
 
<TABLE>
<CAPTION>
                                                                                    YEARS ENDED DECEMBER 31,
                                                                               ----------------------------------
                                                                                  1995        1996        1997
                                                                               ----------  ----------  ----------
                                                                                     (DOLLARS IN THOUSANDS)
<S>                                                                            <C>         <C>         <C>
Income before income taxes...................................................  $  506,301  $  412,350  $  650,018
Income tax expense...........................................................     193,359     162,892     238,722
Effective tax rate...........................................................          38%         40%         37%
</TABLE>
 
    Our effective tax rate in 1996 was 40% compared with 37% in 1997. Excluding
a $5 million after-tax benefit recognized in 1996 from a settlement with the
State of California Franchise Tax Board for 1985 and 1986, the effective tax
rate in 1996 was 41%. The lower 1997 effective tax rate was the result of an
after-tax refund from the State of California Franchise Tax Board of
approximately $25 million to settle litigation, administration, and audit
disputes covering the years 1975-1987. Excluding the State of California
Franchise Tax Board refund, the effective tax rate for 1997 was also 41%.
 
    CREDIT RISK MANAGEMENT
 
    Our principal business activity is the extension of credit in the form of
loans or other credit substitutes to individuals and businesses. Our policies
and applicable laws and regulations governing the extension of credit require
risk analysis as well as ongoing portfolio and credit management through loan
product diversification, lending limit constraints, credit review and approval
policies, and extensive internal monitoring.
 
    We manage and control credit risk through diversification of the portfolio
by type of loan, industry concentration, dollar limits on multiple loans to the
same borrower, geographic distribution and type of borrower. Geographic
diversification of loans originated through our branch network is generally
within California, Oregon and Washington, which we consider to be our principal
markets. In addition, we will continue to originate and participate in lending
activities outside these states, as well as internationally.
 
    In analyzing our existing loan portfolios, we apply specific monitoring
policies and procedures which vary according to the relative risk profile and
other characteristics of the loans within the various portfolios. Our
residential and consumer loans are relatively homogeneous and no single loan is
individually significant in terms of its size or potential risk of loss.
Therefore, we review our residential and consumer portfolios by analyzing their
performance as a pool of loans. In contrast, our monitoring process for the
commercial, financial and industrial; construction; commercial mortgage; and
foreign loan portfolios includes a periodic review of individual loans. Loans
that are performing but have shown some signs of weakness are subjected to more
stringent reporting and oversight. We review these loans to assess the ability
of the borrowing entity to continue to service all of its interest and principal
obligations and as a result may adjust the risk grade accordingly. In the event
that we believe that full collection of principal and interest is not reasonably
assured, the loan will be appropriately downgraded and, if warranted, placed on
nonaccrual status, even though the loan may be current as to principal and
interest payments.
 
    We have a Credit Policy Forum, composed of the Chief Credit Officer, senior
credit officers, and appropriate line officers who establish policy, credit
quality criteria, portfolio guidelines and other controls. Credit Administration
together with a series of loan committees, have the responsibility for
administering the credit approval process, as well as the implementation and
administration of our credit policies and lending practices and procedures.
These policies require an extensive evaluation of credit requests and continuing
review of existing credits in order to promptly identify, monitor and quantify
evidence of deterioration of asset credit quality or potential loss.
 
    As another part of the control process, an independent internal credit
review and examination function provides quality assurance that loans and
commitments are made and maintained as prescribed by
 
                                      S-45
<PAGE>
our credit policies and that the assets are appropriately and timely risk
graded. This includes a review of compliance with our underwriting policies when
the loan is initially extended and subsequent on-site examinations to ensure
continued compliance.
 
    LOANS
 
    The following table shows loans outstanding at year-end by loan type. Loans
outstanding by loan type as a percentage of total loans is shown for 1993
through 1997.
<TABLE>
<CAPTION>
                                                                           DECEMBER 31,
                                 -------------------------------------------------------------------------------------------------
                                         1993                  1994                  1995                  1996            1997
                                 --------------------  --------------------  --------------------  --------------------  ---------
                                                                       (DOLLARS IN MILLIONS)
<S>                              <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
Domestic:
  Commercial, financial and
    industrial.................  $   8,135         46% $   8,547         47% $   9,684         47% $   9,496         45% $  10,747
  Construction.................        877          5        464          3        370          2        358          2        293
  Mortgage:
    Residential................      1,964         11      2,253         12      2,642         13      2,961         14      2,961
    Commercial.................      2,088         12      1,778         10      2,143         10      2,598         12      2,952
                                 ---------        ---  ---------        ---  ---------        ---  ---------        ---  ---------
      Total mortgage...........      4,052         23      4,031         22      4,785         23      5,559         26      5,913
  Consumer:
    Installment................      1,351          8      1,644          9      1,812          9      2,063         10      2,091
    Home equity................      1,302          7      1,222          7      1,222          6      1,113          5        993
    Credit card and other
      lines of credit..........        207          1        219          1        309          2        303          1        270
                                 ---------        ---  ---------        ---  ---------        ---  ---------        ---  ---------
      Total consumer...........      2,860         16      3,085         17      3,343         17      3,479         16      3,354
  Lease financing..............        831          4        829          5        845          4        800          4        875
                                 ---------        ---  ---------        ---  ---------        ---  ---------        ---  ---------
      Total loans in domestic
        offices................     16,755         94     16,956         94     19,027         93     19,692         93     21,182
                                 ---------             ---------             ---------             ---------             ---------
Loans originated in foreign
  branches.....................      1,004          6      1,110          6      1,405          7      1,358          7      1,559
                                 ---------        ---  ---------        ---  ---------        ---  ---------        ---  ---------
      Total loans..............  $  17,759        100% $  18,066        100% $  20,432        100% $  21,050        100% $  22,741
                                 ---------        ---  ---------        ---  ---------        ---  ---------        ---  ---------
                                 ---------        ---  ---------        ---  ---------        ---  ---------        ---  ---------
 
<CAPTION>
 
<S>                              <C>
Domestic:
  Commercial, financial and
    industrial.................         47%
  Construction.................          1
  Mortgage:
    Residential................         13
    Commercial.................         13
                                       ---
      Total mortgage...........         26
  Consumer:
    Installment................          9
    Home equity................          5
    Credit card and other
      lines of credit..........          1
                                       ---
      Total consumer...........         15
  Lease financing..............          4
                                       ---
      Total loans in domestic
        offices................         93
 
Loans originated in foreign
  branches.....................          7
                                       ---
      Total loans..............        100%
                                       ---
                                       ---
</TABLE>
 
    Our lending activities are predominantly domestic, with such loans
comprising approximately 93 percent of the portfolio at December 31, 1997. Total
loans at December 31, 1997 were $22.7 billion, an increase of $1,691 million, or
8 percent, from one year earlier. The increase was primarily attributable to
growth in the commercial, financial and industrial loan portfolio, which
increased $1,251 million from 1996, and to growth in the commercial mortgage
loan portfolio, which increased $354 million.
 
    COMMERCIAL, FINANCIAL AND INDUSTRIAL LOANS.  Commercial, financial and
industrial loans represent the largest category in the loan portfolio. These
loans are extended principally to major corporations, middle market businesses,
and small businesses, with no industry concentration exceeding ten percent of
total commercial, financial and industrial loans.
 
    Our commercial market lending originates primarily through its banking
office network. These offices, which rely extensively on relationship oriented
banking, provide many services including cash management services, lines of
credit, accounts receivable and inventory financing. Separately, we originate or
participate in a wide variety of financial services to major corporations. These
services include traditional commercial banking and specialized financing
tailored to the needs of each customer's specific industry. Presently, we are
active in the communications and media, energy related services, retailing and
financial services industries.
 
    At December 31, 1997, the commercial, financial and industrial loan
portfolio was $10,747 million, or 47 percent, of the total loan portfolio. The
increase of $1,251 million, or 13 percent, from the previous
 
                                      S-46
<PAGE>
year-end was primarily attributable to loans extended to large corporations in
industries where our bank has specialized lending expertise.
 
    CONSTRUCTION AND COMMERCIAL MORTGAGE LOANS.  We engage in nonresidential
real estate lending which includes commercial mortgage loans and construction
loans secured by deeds of trust. Construction loans are made primarily to
residential builders and to commercial property developers.
 
    At December 31, 1997, construction loans were $293 million, $65 million
lower than at the end of the previous year. Commercial mortgage loans were
$2,952 million, an increase of $354 million, or 14 percent, from a year earlier.
This increase was primarily attributable to a strong recovery in the California
real estate market reflecting the continuing improvement in the West Coast
economy, particularly in the real estate sector.
 
    RESIDENTIAL MORTGAGE LOANS.  We originate residential loans through its
branch network in California, Oregon, and Washington, and periodically purchases
loans in its market area.
 
    At December 31, 1997, residential loans were $2,961 million, unchanged from
the prior year.
 
    CONSUMER LOANS.  Through our branch network, we originate consumer loans,
such as vehicle-secured installment loans, home equity lines where advances are
generally secured by second deeds of trust on residential real estate, and
credit card loans.
 
    At December 31, 1996, consumer loans were $3,479 million, or 16 percent of
total loans, compared with $3,354 million, or 15 percent of total loans, at
year-end 1997.
 
    LEASE FINANCING.  We enter into direct financing and leveraged leases
through an agreement with a subsidiary of The Bank of Tokyo-Mitsubishi. In
addition, we originate auto leases.
 
    At December 31, 1997, lease financing outstandings were $875 million, an
increase of $75 million from the end of 1996.
 
    LOANS ORIGINATED IN FOREIGN BRANCHES.  Our loans originated in foreign
branches consist primarily of short-term credit extensions to financial
institutions located primarily in Asia and short-term commercial and industrial
loans to major Japanese, Korean, and Taiwanese corporations.
 
    At December 31, 1996, loans originated in foreign branches totaled $1,358
million, or 7 percent of the total loan portfolio, compared with $1,559 million,
or 7 percent of total loans, at December 31, 1997.
 
    CROSS-BORDER OUTSTANDINGS
 
    Our cross-border outstandings reflect certain additional economic and
political risks that are not reflected in domestic outstandings. These risks
include those arising from exchange rate fluctuations and restrictions on the
transfer of funds. The following table sets forth our cross-border outstandings
as of December 31, 1995, 1996 and 1997 for each country where such outstandings
exceeded one percent of total assets. The cross-border outstandings were
compiled based upon category and domicile of ultimate risk and are comprised of
balances with banks, trading securities, securities available for sale,
securities purchased under resale agreements, loans, accrued interest
receivable, acceptances outstanding and investments with foreign entities. The
amounts outstanding for each country exclude local currency
 
                                      S-47
<PAGE>
outstandings. We do not have significant local currency outstandings to the
individual countries listed in the following table that are not hedged or are
not funded by local currency borrowings.
 
<TABLE>
<CAPTION>
                                                                               PUBLIC      CORPORATIONS
                                                                 FINANCIAL     SECTOR        AND OTHER         TOTAL
                                                                INSTITUTIONS  ENTITIES       BORROWERS     OUTSTANDINGS
                                                                -----------  -----------  ---------------  -------------
                                                                                 (DOLLARS IN MILLIONS)
<S>                                                             <C>          <C>          <C>              <C>
December 31, 1995
  Japan.......................................................   $   1,111    $  --          $     567       $   1,678
  Korea.......................................................         641       --                269             910
 
December 31, 1996
  Japan.......................................................       1,373       --                452           1,825
  Korea.......................................................         574            8            330             912
 
December 31, 1997
  Japan.......................................................         401       --                438             839
  Korea.......................................................         561           10            257             828
  Thailand....................................................         320       --             --                 320
</TABLE>
 
    The economic condition and the ability of some countries, to which we have
cross-border exposure, to manage their external debt obligations have been
impacted by the Asian economic crisis beginning in the second half of 1997. The
events leading to the crisis included currency devaluations, business failures,
principally caused by excessive debt levels and overcapacity, and some loss of
confidence in the banking system in the affected countries, resulting mainly
from past lending practices and the associated impact of internal and external
economic conditions. The crisis resulted in a substantial erosion of
international confidence, rapid declines in stock market valuations, steep
increases in interest rates and further pressure on the debt structures of the
corporate and financial market participants. International Monetary Fund
programs have been established or are in the process of being established which,
in cooperation with steps being taken by the local governments and other global
institutions, are designed to restore confidence. The success of these programs
is still being evaluated.
 
    We are managing our exposures in these and other impacted countries very
cautiously with a view to minimizing risk and supporting its long term and
viable customer relationships. High risk situations are being identified and
reduced where possible, and additional reserves against potential credit losses
have been identified and allocated, as determined by management at year end.
None of our cross-border exposure has been subject to the recently announced
debt restructuring program with South Korea.
 
    Although management cannot predict the ultimate impact of the crisis on our
financial position and results of operations since much depends on the effect of
the stabilizing activities already under way, management believes that the
continuation of internal supervision, monitoring and portfolio risk management
practices will be effective in minimizing the impact over and above that already
identified. Increases in non-accrual loans, together with some related increases
in charge-off activity, may occur as events unfold.
 
    Management, in accordance with its established risk management practices,
will also continue to review the impact of the crisis on the stability of other
countries and the potential impact on domestic business activities, particularly
in our core West Coast markets.
 
    ALLOWANCE FOR CREDIT LOSSES
 
    The allowance for credit losses is maintained at a level considered
appropriate by management and is based on an ongoing assessment of the risks
inherent in the credit and lease portfolio, including commitments to provide
financing. The allowance is increased by the provision for credit losses, which
is charged against current period operating results, and is decreased by the
amount of net loans charged off during the period. In evaluating the adequacy of
the allowance for credit losses, management incorporates
 
                                      S-48
<PAGE>
such factors as collateral value, portfolio composition and concentration, and
trends in local and national economic conditions and the related impact on the
financial strength of our borrowers. While the allowance is segmented by broad
portfolio categories to analyze its adequacy, the allowance is general in nature
and is available for the portfolio in its entirety. Although management believes
that the allowance for possible credit losses is adequate, future provisions
will be subject to continuing evaluation of inherent risk in the loan portfolio.
Based on the process of evaluation described above, we did not provide for
credit losses during 1997.
 
    The following table sets forth the allocation of the allowance for credit
losses. The percentages reflect the allowance allocated to each respective loan
category at period end, as a percentage of the total period end balance of that
loan category, as set forth in the "Loans" table at page S-46.
<TABLE>
<CAPTION>
                                                                       DECEMBER 31,
                             -------------------------------------------------------------------------------------------------
                                     1993                  1994                  1995                  1996            1997
                             --------------------  --------------------  --------------------  --------------------  ---------
                                                                  (DOLLARS IN THOUSANDS)
<S>                          <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
Domestic:
  Commercial, financial and
    industrial.............  $ 205,398       2.52% $ 146,784       1.72% $ 174,146       1.80% $ 166,100       1.75% $ 123,610
  Construction.............    106,398      12.13     69,787      15.04     24,752       6.69      5,700       1.59      3,221
  Mortgage:
    Residential............     31,409       1.60     23,581       1.05      5,466       0.21      4,000       0.14      2,700
    Commercial.............    139,303       6.67     70,130       3.94     59,931       2.80     39,000       1.50     60,680
                             ---------             ---------             ---------             ---------             ---------
      Total mortgage.......    170,712       4.21     93,711       2.32     65,397       1.37     43,000       0.77     63,380
  Consumer:
    Installment............     13,100       0.97     12,500       0.76     13,200       0.73     10,400       0.50     11,400
    Home equity............      6,062       0.47      7,143       0.58      5,532       0.45      4,900       0.44      3,600
    Credit card and other
      lines of credit......     15,171       7.33     17,101       7.81     32,799      10.61     34,000      11.22     30,500
                             ---------             ---------             ---------             ---------             ---------
      Total consumer.......     34,333       1.20     36,744       1.19     51,531       1.54     49,300       1.42     45,500
  Lease financing..........     12,500       1.50     10,000       1.21      1,300       0.15      5,300       0.66      4,862
                             ---------             ---------             ---------             ---------             ---------
      Total domestic
        allowance..........    529,341       3.16    357,026       2.11    317,126       1.67    269,400       1.37    240,573
Foreign allowance..........     14,293       1.42     15,330       1.38     13,968       0.99      9,394       0.69     39,313
Unallocated................    148,950               190,786               224,055               245,152               171,806
                             ---------             ---------             ---------             ---------             ---------
      Total allowance for
        credit losses......  $ 692,584       3.90% $ 563,142       3.12% $ 555,149       2.72% $ 523,946       2.49% $ 451,692
                             ---------             ---------             ---------             ---------             ---------
                             ---------             ---------             ---------             ---------             ---------
 
<CAPTION>
<S>                          <C>
Domestic:
  Commercial, financial and
    industrial.............       1.15%
  Construction.............       1.10
  Mortgage:
    Residential............       0.09
    Commercial.............       2.06
      Total mortgage.......       1.07
  Consumer:
    Installment............       0.55
    Home equity............       0.36
    Credit card and other
      lines of credit......      11.30
      Total consumer.......       1.36
  Lease financing..........       0.56
      Total domestic
        allowance..........       1.14
Foreign allowance..........       2.52
Unallocated................
      Total allowance for
        credit losses......       1.99%
</TABLE>
 
    At December 31, 1997, we reallocated a portion of the allowance for credit
losses to foreign exposures which include off-balance sheet instruments. The
increase from $9 million at December 31, 1996 to $39 million at December 31,
1997 was primarily precautionary in nature, in light of the recent volatility in
the Asian financial markets. As is the case with the allowance in general,
amounts may be reallocated as circumstances change.
 
                                      S-49
<PAGE>
    The following table sets forth a reconciliation of changes in our allowance
for credit losses.
 
<TABLE>
<CAPTION>
                                                                        YEARS ENDED DECEMBER 31,
                                                       ----------------------------------------------------------
                                                          1993        1994        1995        1996        1997
                                                       ----------  ----------  ----------  ----------  ----------
                                                                         (DOLLARS IN THOUSANDS)
<S>                                                    <C>         <C>         <C>         <C>         <C>
Balance, beginning of year...........................  $  790,479  $  692,584  $  563,142  $  555,149  $  523,946
Loans charged off:
  Commercial, financial and industrial...............      99,280     105,774      47,524      42,134      58,664
  Construction.......................................      58,835      32,151       9,401       3,249         120
  Mortgage...........................................     113,791     100,613      29,330      13,483       5,058
  Consumer...........................................      39,576      31,806      44,627      56,361      55,336
  Lease financing....................................      11,432       2,940       2,422       2,623       3,601
  Foreign(1).........................................         201         533         295       1,250      --
                                                       ----------  ----------  ----------  ----------  ----------
    Total loans charged off..........................     323,115     273,817     133,599     119,100     122,779
Recoveries of loans previously charged off:
  Commercial, financial and industrial...............      41,552      39,177      39,178      22,341      23,371
  Construction.......................................       2,955       5,868       3,195         132       9,054
  Mortgage...........................................       6,201      16,228      18,500      12,277       3,292
  Consumer...........................................       8,872       8,915      10,924      12,906      14,946
  Lease financing....................................       3,353         435         311         368         351
  Foreign(1).........................................      11,229         627         295      --          --
                                                       ----------  ----------  ----------  ----------  ----------
    Total recoveries of loans previously charged
      off............................................      74,162      71,250      72,403      48,024      51,014
                                                       ----------  ----------  ----------  ----------  ----------
      Net loans charged off..........................     248,953     202,567      61,196      71,076      71,765
Provision for credit losses..........................     151,000      73,000      53,250      40,000      --
Foreign translation adjustment and other net
  additions (deductions).............................          58         125         (47)       (127)       (489)
                                                       ----------  ----------  ----------  ----------  ----------
Balance, end of year.................................  $  692,584  $  563,142  $  555,149  $  523,946  $  451,692
                                                       ----------  ----------  ----------  ----------  ----------
                                                       ----------  ----------  ----------  ----------  ----------
Allowance for credit losses to total loans...........        3.90%       3.12%       2.72%       2.49%       1.99%
Provision for credit losses to net loans charged
  off................................................       60.65       36.04       87.02       56.28      --
Recoveries of loans to loans charged off in the
  previous year......................................       24.38       22.05       26.44       35.95       42.83
Net loans charged off to average loans outstanding...        1.37        1.15        0.32        0.34        0.33
Allowance for credit losses to nonaccrual
  loans..............................................       84.82      161.08      266.56      408.48      413.12
</TABLE>
 
- ------------------------
 
(1) Foreign loans are those loans originated in foreign branches.
 
    At December 31, 1996, our allowance for credit losses was $524 million, or
2.49% of the total loan portfolio, and 408% of total nonaccrual loans. This
compares with an allowance for credit losses of $452 million, or 1.99% of the
total loan portfolio, and 413% of total nonaccrual loans at December 31, 1997.
At year-end 1996, the unallocated portion of the allowance for credit losses was
$245 million compared with $172 million at the end of 1997.
 
    During 1997, we recorded no provision for credit losses, a decrease of $40
million from 1996. The decline in the provision for credit losses reflected the
improvement in the quality of our loan portfolio, including a 15 percent
reduction in nonaccrual loans.
 
                                      S-50
<PAGE>
    During 1996, we had net loans charged off of $71 million compared to net
loans charged off of $72 million in 1997. Recoveries of loans previously charged
off increased by $3 million, and the percentage of current year recoveries to
loans charged off in the previous year increased from 35.95% in 1996 to 42.83%
in 1997. Loans charged off in 1997 increased by $4 million primarily due to a
$17 million increase in commercial, financial and industrial loans charged off,
partially offset by a $8 million decrease in mortgage loans charged off.
 
    NONPERFORMING ASSETS
 
    Nonperforming assets consist of nonaccrual loans, renegotiated loans, and
foreclosed assets. Nonaccrual loans are those for which management has
discontinued accrual of interest because there exists significant uncertainty as
to the full and timely collection of either principal or interest or such loans
have become contractually past due 90 days with respect to principal or
interest. For a more detailed discussion of the accounting for nonaccrual loans,
see Note 1 to our Consolidated Financial Statements.
 
    Renegotiated loans are those accruing loans for which, for reasons related
to the borrower's financial difficulties, we have amended the terms of the
original loan agreement and the borrower is performing according to the
renegotiated terms.
 
    Foreclosed assets includes property where we acquired title through
foreclosure or "deed in lieu" of foreclosure. On an ongoing basis, foreclosed
asset values are reviewed and any decline in value is recognized as noninterest
expense in the current period.
 
    The following table sets forth an analysis of nonperforming assets.
 
<TABLE>
<CAPTION>
                                                                             DECEMBER 31,
                                                     ------------------------------------------------------------
                                                         1993         1994        1995        1996        1997
                                                     ------------  ----------  ----------  ----------  ----------
                                                                        (DOLLARS IN THOUSANDS)
<S>                                                  <C>           <C>         <C>         <C>         <C>
Commercial, financial and industrial...............  $    145,907  $  106,447  $   84,336  $   56,864  $   46,392
Construction.......................................       231,148      73,643      40,026       7,349       4,071
Mortgage:
  Residential......................................        61,809      17,020      19,220      11,214         954
  Commercial.......................................       367,072     145,207      63,836      52,593      57,921
                                                     ------------  ----------  ----------  ----------  ----------
    Total mortgage.................................       428,881     162,227      83,056      63,807      58,875
Other..............................................         7,288       7,285         849         247      --
Foreign(1).........................................         3,331      --          --          --          --
                                                     ------------  ----------  ----------  ----------  ----------
    Total nonaccrual loans.........................       816,555     349,602     208,267     128,267     109,338
Renegotiated loans.................................         4,617      14,843       1,612      --          --
Nonperforming real estate ventures.................        23,256      --          --          --          --
Foreclosed assets..................................       349,022      56,782      36,992      28,517      20,471
                                                     ------------  ----------  ----------  ----------  ----------
    Total nonperforming assets.....................  $  1,193,450  $  421,227  $  246,871  $  156,784  $  129,809
                                                     ------------  ----------  ----------  ----------  ----------
                                                     ------------  ----------  ----------  ----------  ----------
Allowance for credit losses........................  $    692,584  $  563,142  $  555,149  $  523,946  $  451,692
                                                     ------------  ----------  ----------  ----------  ----------
                                                     ------------  ----------  ----------  ----------  ----------
Nonaccrual and renegotiated loans to total loans...          4.62%       2.02%       1.03%       0.61%       0.48%
Nonaccrual loans to allowance for credit losses....        117.90       62.08       37.52       24.48       24.21
Nonperforming assets to total loans, real estate
  ventures and foreclosed assets...................          6.58        2.32        1.21        0.74        0.57
Nonperforming assets to total assets...............          4.97        1.71        0.90        0.54        0.42
</TABLE>
 
- ------------------------
 
(1) Foreign loans are those loans originated in foreign branches.
 
                                      S-51
<PAGE>
    The following table sets forth an analysis of loans contractually past due
90 days or more as to interest or principal, but not included in nonaccrual
loans above.
 
<TABLE>
<CAPTION>
                                                                                 DECEMBER 31,
                                                             -----------------------------------------------------
                                                               1993       1994       1995       1996       1997
                                                             ---------  ---------  ---------  ---------  ---------
                                                                            (DOLLARS IN THOUSANDS)
<S>                                                          <C>        <C>        <C>        <C>        <C>
Commercial, financial and industrial.......................  $  12,116  $   3,690  $   3,752  $   4,527  $     450
Construction...............................................     10,711      5,735      1,063     --         --
Mortgage:
  Residential..............................................     14,602      2,123      8,479      8,969     10,170
  Commercial...............................................     35,071     --          3,592        168      1,660
                                                             ---------  ---------  ---------  ---------  ---------
    Total mortgage.........................................     49,673      2,123     12,071      9,137     11,830
Consumer and other.........................................      8,481      8,573      8,854     10,028      7,712
                                                             ---------  ---------  ---------  ---------  ---------
    Total loans 90 days or more past due and still
      accruing.............................................  $  80,981  $  20,121  $  25,740  $  23,692  $  19,992
                                                             ---------  ---------  ---------  ---------  ---------
                                                             ---------  ---------  ---------  ---------  ---------
</TABLE>
 
    At December 31, 1997, nonaccrual loans totaled $109 million, a decrease of
$19 million, or 15 percent, from year-end 1996. The decline was primarily
attributable to a $10 million reduction in nonaccrual commercial, financial and
industrial loans and a $10 million reduction in nonaccrual residential mortgage
loans. Foreclosed assets, primarily other real estate owned, decreased by $8
million due to sales of individual assets.
 
    Nonaccrual and renegotiated loans as a percentage of total loans were 0.61%
at December 31, 1996 compared with 0.48% at December 31, 1997. Nonperforming
assets as a percentage of total loans, real estate ventures and foreclosed
assets improved from 0.74% at December 31, 1996 to 0.57% at year-end 1997. At
December 31, 1997, approximately 58 percent of nonaccrual loans were real estate
related.
 
    Total loans 90 days or more past due and still accruing were $24 million at
December 31, 1996 compared with $20 million at December 31, 1997. At December
31, 1996, impaired loans were $114 million and the associated impairment
allowance was $21 million compared with $108 million and $9 million,
respectively, at December 31, 1997.
 
    INTEREST FOREGONE
 
    Interest foregone during 1996 and 1997 for loans that were on nonaccrual
status at December 31, 1996 and 1997 was $9 million and $6 million,
respectively. We recognized interest income during 1996 and 1997 for loans that
were on nonaccrual status at December 31, 1996 and 1997 of $5 million and $3
million, respectively.
 
                                      S-52
<PAGE>
    SECURITIES
 
    The following tables summarize the composition of the securities portfolio
and the gross unrealized gains and losses within the portfolio.
 
    SECURITIES AVAILABLE FOR SALE.
 
<TABLE>
<CAPTION>
                                                                  DECEMBER 31,
                    ---------------------------------------------------------------------------------------------------------
                                                    1996                                            1997
                      1995     ----------------------------------------------  ----------------------------------------------
                    ---------                GROSS        GROSS                              GROSS        GROSS
                      FAIR     AMORTIZED  UNREALIZED   UNREALIZED     FAIR     AMORTIZED  UNREALIZED   UNREALIZED     FAIR
                      VALUE      COST        GAINS       LOSSES       VALUE      COST        GAINS       LOSSES       VALUE
                    ---------  ---------  -----------  -----------  ---------  ---------  -----------  -----------  ---------
                                                             (DOLLARS IN THOUSANDS)
<S>                 <C>        <C>        <C>          <C>          <C>        <C>        <C>          <C>          <C>
U.S. Treasury.....  $ 994,492  $1,137,992  $   4,993    $   1,933   $1,141,052 $ 987,374   $  10,793    $     170   $ 997,997
Other U.S.
  government......    364,584    687,717       4,993          779     691,931    709,536       6,005           67     715,474
Mortgage-backed
  securities......    448,173    193,531         400          274     193,657    679,692       3,331          265     682,758
State and
  municipal.......    132,698    101,006      13,749       --         114,755     90,937      13,236       --         104,173
Corporate debt
  securities......     --         --          --           --          --          2,698         311            1       3,008
Equity
  securities......     16,539     19,041       2,553       --          21,594     28,881       1,596          672      29,805
Foreign
  securities......      4,065      1,136          72       --           1,208      5,132          39       --           5,171
                    ---------  ---------  -----------  -----------  ---------  ---------  -----------  -----------  ---------
  Total securities
    available for
    sale..........  $1,960,551 $2,140,423  $  26,760    $   2,986   $2,164,197 $2,504,250  $  35,311    $   1,175   $2,538,386
                    ---------  ---------  -----------  -----------  ---------  ---------  -----------  -----------  ---------
                    ---------  ---------  -----------  -----------  ---------  ---------  -----------  -----------  ---------
</TABLE>
 
    SECURITIES HELD TO MATURITY.
<TABLE>
<CAPTION>
                                                                   DECEMBER 31,
                       ----------------------------------------------------------------------------------------------------
                                                          1996                                        1997
                          1995      ------------------------------------------------  -------------------------------------
                       -----------                  GROSS        GROSS                                GROSS        GROSS
                        AMORTIZED    AMORTIZED   UNREALIZED   UNREALIZED     FAIR      AMORTIZED   UNREALIZED   UNREALIZED
                          COST         COST         GAINS       LOSSES       VALUE       COST         GAINS       LOSSES
                       -----------  -----------  -----------  -----------  ---------  -----------  -----------  -----------
                                                              (DOLLARS IN THOUSANDS)
<S>                    <C>          <C>          <C>          <C>          <C>        <C>          <C>          <C>
U.S. Treasury........   $  51,125    $  50,109    $   1,735    $  --       $  51,844   $  40,092    $   1,333    $  --
Other U.S.
  government.........     138,816      139,188        4,412       --         143,600      99,520        2,568       --
Mortgage-backed
  securities.........     124,375       41,985        2,019           68      43,936      24,477        1,745           14
State and
  municipal..........      48,971       36,914          310        2,199      35,025      24,686           75        1,367
                       -----------  -----------  -----------  -----------  ---------  -----------  -----------  -----------
  Total securities
    held to
    maturity.........   $ 363,287    $ 268,196    $   8,476    $   2,267   $ 274,405   $ 188,775    $   5,721    $   1,381
                       -----------  -----------  -----------  -----------  ---------  -----------  -----------  -----------
                       -----------  -----------  -----------  -----------  ---------  -----------  -----------  -----------
 
<CAPTION>
 
                         FAIR
                         VALUE
                       ---------
 
<S>                    <C>
U.S. Treasury........  $  41,425
Other U.S.
  government.........    102,088
Mortgage-backed
  securities.........     26,208
State and
  municipal..........     23,394
                       ---------
  Total securities
    held to
    maturity.........  $ 193,115
                       ---------
                       ---------
</TABLE>
 
    Management of the securities portfolio involves the maximization of return
while maintaining prudent levels of quality and liquidity. At December 31, 1997,
approximately 98 percent of total securities were investment grade.
 
    During the quarter ended December 31, 1995, in accordance with guidance
issued by the Financial Accounting Standards Board, we reclassified from
securities held to maturity to securities available for sale approximately $285
million at amortized cost of U.S. Treasury Notes (fair value $285 million) and
$64 million at amortized cost of municipal bonds (fair value $72 million).
 
                                      S-53
<PAGE>
    ANALYSIS OF SECURITIES PORTFOLIO
 
    The following tables show the remaining contractual maturities and expected
yields of the securities portfolio.
 
    SECURITIES AVAILABLE FOR SALE.
<TABLE>
<CAPTION>
                                                                         DECEMBER 31, 1997
                                       -------------------------------------------------------------------------------------
                                       MATURITY
                                       -------------------------------------------------------------------------------------
                                                                 AFTER ONE YEAR AND      AFTER FIVE YEARS AND
                                               WITHIN                  WITHIN                   WITHIN            AFTER TEN
                                              ONE YEAR               FIVE YEARS               TEN YEARS             YEARS
                                       ----------------------  ----------------------  ------------------------  -----------
                                        AMOUNT     YIELD(4)     AMOUNT     YIELD(4)      AMOUNT      YIELD(4)      AMOUNT
                                       ---------  -----------  ---------  -----------  -----------  -----------  -----------
                                                                      (DOLLARS IN THOUSANDS)
                                       -------------------------------------------------------------------------------------
<S>                                    <C>        <C>          <C>        <C>          <C>          <C>          <C>
U.S. Treasury........................  $ 150,048        6.22%  $ 837,326        6.31%   $  --           --    %   $  --
Other U.S. government................     99,940        6.49     609,596        6.38       --           --           --
Mortgage-backed securities(1)........     53,108        6.82     626,584        6.41       --           --           --
State and municipal(2)...............     14,944       10.49      26,409        9.90       12,971        11.09       36,613
Corporate debt securities............     --          --           1,432       17.31        1,266        12.42       --
Equity securities(3).................     --          --          --          --           --           --           --
Foreign securities...................      3,419       14.30      --          --            1,713         6.29       --
                                       ---------               ---------               -----------               -----------
    Total securities available for
      sale...........................  $ 321,459        6.69%  $2,101,347       6.41%   $  15,950        10.68%   $  36,613
                                       ---------               ---------               -----------               -----------
                                       ---------               ---------               -----------               -----------
 
<CAPTION>
 
                                                       TOTAL AMORTIZED
                                                    ----------------------
                                        YIELD(4)     AMOUNT     YIELD(4)
                                       -----------  ---------  -----------
 
<S>                                    <C>          <C>        <C>
U.S. Treasury........................      --    %  $ 987,374        6.30%
Other U.S. government................      --         709,536        6.40
Mortgage-backed securities(1)........      --         679,692        6.44
State and municipal(2)...............       11.33      90,937       10.74
Corporate debt securities............      --           2,698       15.02
Equity securities(3).................      --          28,881      --
Foreign securities...................      --           5,132       11.63
                                                    ---------
    Total securities available for
      sale...........................       11.33%  $2,504,250       6.48%
                                                    ---------
                                                    ---------
</TABLE>
 
    SECURITIES HELD TO MATURITY.
<TABLE>
<CAPTION>
                                                                            DECEMBER 31, 1997
                                         ---------------------------------------------------------------------------------------
                                                                                                                       MATURITY
                                         ---------------------------------------------------------------------------------------
                                                                     AFTER ONE YEAR AND      AFTER FIVE YEARS AND
                                                  WITHIN                   WITHIN                   WITHIN            AFTER TEN
                                                 ONE YEAR                FIVE YEARS               TEN YEARS             YEARS
                                         ------------------------  ----------------------  ------------------------  -----------
                                           AMOUNT      YIELD(4)     AMOUNT     YIELD(4)      AMOUNT      YIELD(4)      AMOUNT
                                         -----------  -----------  ---------  -----------  -----------  -----------  -----------
                                                                         (DOLLARS IN THOUSANDS)
<S>                                      <C>          <C>          <C>        <C>          <C>          <C>          <C>
U.S. Treasury..........................   $  --           --    %  $  40,092        7.56%   $  --           --    %   $  --
Other U.S. government..................      10,000         8.00      89,520        7.72       --           --           --
Mortgage-backed securities(1)..........       3,622         4.88      20,855        9.03       --           --           --
State and municipal(2).................       9,077         9.19      --          --            2,596         6.35       13,013
                                         -----------               ---------               -----------               -----------
  Total securities held to maturity....   $  22,699         7.98%  $ 150,467        7.86%   $   2,596         6.35%   $  13,013
                                         -----------               ---------               -----------               -----------
                                         -----------               ---------               -----------               -----------
 
<CAPTION>
 
                                                         TOTAL AMORTIZED
                                                      ----------------------
                                          YIELD(4)     AMOUNT     YIELD(4)
                                         -----------  ---------  -----------
 
<S>                                      <C>          <C>        <C>
U.S. Treasury..........................      --    %  $  40,092        7.56%
Other U.S. government..................      --          99,520        7.75
Mortgage-backed securities(1)..........      --          24,477        8.42
State and municipal(2).................        5.77      24,686        7.09
                                                      ---------
  Total securities held to maturity....        5.77%  $ 188,775        7.71%
                                                      ---------
                                                      ---------
</TABLE>
 
- ------------------------------
 
(1) Expected maturities may differ from contractual maturities because borrowers
    have the right to call or prepay obligations, with or without call or
    prepayment penalties.
 
(2) Yields on tax-exempt municipal securities are presented on a
    taxable-equivalent basis using the current federal statutory rate of 35
    percent.
 
(3) Equity securities do not have a stated maturity and are included in the
    total column only.
 
(4) Yields are based on amortized cost.
 
                                      S-54
<PAGE>
    LOAN MATURITIES
 
    The following table presents our loans by maturity.
 
<TABLE>
<CAPTION>
                                                                            DECEMBER 31, 1997
                                                         --------------------------------------------------------
                                                                           AFTER
                                                                          ONE YEAR
                                                            WITHIN       AND WITHIN      AFTER
                                                           ONE YEAR      FIVE YEARS    FIVE YEARS       TOTAL
                                                         -------------  ------------  ------------  -------------
                                                                          (DOLLARS IN THOUSANDS)
<S>                                                      <C>            <C>           <C>           <C>
Domestic:
  Commercial, financial and industrial.................  $   4,102,910  $  4,477,317  $  2,166,952  $  10,747,179
  Construction.........................................        173,504       119,829       --             293,333
  Mortgage:
    Residential........................................          4,230        32,000     2,925,003      2,961,233
    Commercial.........................................        228,955     1,085,913     1,636,939      2,951,807
                                                         -------------  ------------  ------------  -------------
      Total mortgage...................................        233,185     1,117,913     4,561,942      5,913,040
  Consumer:
    Installment........................................        136,264     1,801,620       152,868      2,090,752
    Home equity........................................          2,816        38,570       951,530        992,916
    Credit card and other lines of credit..............        270,045            52       --             270,097
                                                         -------------  ------------  ------------  -------------
      Total consumer...................................        409,125     1,840,242     1,104,398      3,353,765
  Lease financing......................................         83,478       606,904       184,478        874,860
                                                         -------------  ------------  ------------  -------------
      Total loans in domestic offices..................      5,002,202     8,162,205     8,017,770     21,182,177
Loans originated in foreign branches...................      1,515,844        25,627        17,760      1,559,231
                                                         -------------  ------------  ------------  -------------
      Total loans......................................  $   6,518,046  $  8,187,832  $  8,035,530     22,741,408
                                                         -------------  ------------  ------------
                                                         -------------  ------------  ------------
        Allowance for credit losses....................                                                   451,692
                                                                                                    -------------
      Loans, net.......................................                                             $  22,289,716
                                                                                                    -------------
                                                                                                    -------------
Total fixed rate loans due after one year..............                                             $   5,353,709
Total variable rate loans due after one year...........                                                10,869,653
                                                                                                    -------------
      Total loans due after one year...................                                             $  16,223,362
                                                                                                    -------------
                                                                                                    -------------
</TABLE>
 
    CERTIFICATES OF DEPOSIT OF $100,000 AND OVER
 
    The following table presents domestic certificates of deposit of $100,000
and over by maturity.
 
<TABLE>
<CAPTION>
                                                                                                  DECEMBER 31,
                                                                                                      1997
                                                                                              --------------------
                                                                                                  (DOLLARS IN
                                                                                                   THOUSANDS)
<S>                                                                                           <C>
Three months or less........................................................................      $  2,684,438
Over three months through six months........................................................         1,163,014
Over six months through twelve months.......................................................           261,739
Over twelve months..........................................................................           154,948
                                                                                                   -----------
    Total domestic certificates of deposit of $100,000 and over.............................      $  4,264,139
                                                                                                   -----------
                                                                                                   -----------
</TABLE>
 
    We offer certificates of deposit of $100,000 and over at market rates of
interest. Many of these certificates are issued to customers, both public and
private, who have done business with us for an extended period. We expect that
as these deposits come due, the majority will continue to be renewed at market
rates of interest.
 
    Substantially all of our deposits in foreign branches are certificates of
deposit of $100,000 and over and mature in less than one year.
 
                                      S-55
<PAGE>
    BORROWED FUNDS
 
    The following table presents information on our borrowed funds, excluding
subordinated capital notes.
 
<TABLE>
<CAPTION>
                                                                                        DECEMBER 31,
                                                                          ----------------------------------------
                                                                              1995          1996          1997
                                                                          ------------  ------------  ------------
                                                                                   (DOLLARS IN THOUSANDS)
<S>                                                                       <C>           <C>           <C>
Federal funds purchased and securities sold under repurchase agreements
  with weighted average interest rates of 4.96%, 5.09% and 5.38% at
  December 31, 1995, 1996 and 1997, respectively........................  $  1,195,058  $  1,322,654  $  1,335,884
Commercial paper, with weighted average interest rates of 5.75%, 5.34%
  and 5.64% at December 31, 1995, 1996 and 1997, respectively...........     1,389,870     1,495,463       966,575
Other borrowed funds, with weighted average interest rates of 5.78%,
  5.66% and 6.23% at December 31, 1995, 1996 and 1997, respectively.....     1,064,472       749,422       476,010
                                                                          ------------  ------------  ------------
    Total borrowed funds................................................  $  3,649,400  $  3,567,539  $  2,778,469
                                                                          ------------  ------------  ------------
                                                                          ------------  ------------  ------------
Federal funds purchased and securities sold under repurchase agreements:
  Maximum outstanding at any month end..................................  $  1,517,999  $  1,322,654  $  1,575,930
  Average balance during the year.......................................     1,384,762       933,433     1,097,707
  Weighted average interest rate during the year........................          5.70%         5.05%         5.33%
 
Commercial paper:
  Maximum outstanding at any month end..................................  $  1,591,712  $  1,854,576  $  1,876,135
  Average balance during the year.......................................     1,448,739     1,620,087     1,637,070
  Weighted average interest rate during the year........................          5.98%         5.40%         5.49%
 
Other borrowed funds:
  Maximum outstanding at any month end..................................  $  1,319,444  $  1,697,236  $    851,694
  Average balance during the year.......................................       731,759     1,119,051       635,900
  Weighted average interest rate during the year........................          5.82%         5.59%         5.42%
</TABLE>
 
    CAPITAL ADEQUACY AND DIVIDENDS
 
    Our principal capital objectives are to support future growth, to protect
depositors, to absorb any unanticipated losses and to comply with various
regulatory requirements. Management believes that we have retained our capital
at a level which supports our risk structure, as well as providing for
anticipated growth of current business activities and strategic expansion.
 
    Total shareholders' equity was $2,679 million at December 31, 1997, an
increase of $184 million from year-end 1996. This change was primarily a result
of $411 million of net income for 1997, offset by the redemption of $135 million
in preferred stock and dividends on common and preferred stock of $97 million.
 
    We offer a dividend reinvestment plan that allows shareholders to reinvest
dividends in our common stock at 5 percent below the market price. At December
31, 1997, The Bank of Tokyo-Mitsubishi was not a participant in the plan.
 
    Capital adequacy depends on a variety of factors including asset quality and
risk profile, liquidity, stability of earnings, competitive and economic
conditions, and management. We believe that the current
 
                                      S-56
<PAGE>
level of profitability, coupled with a prudent dividend policy, is adequate to
support normal growth in operations while meeting regulatory capital guidelines.
 
    The following table summarizes our risk-based capital, risk-weighted assets,
and risk-based capital ratios.
 
<TABLE>
<CAPTION>
                                                                 DECEMBER 31,                                    MINIMUM
                                   -------------------------------------------------------------------------   REGULATORY
                                       1993           1994           1995           1996           1997        REQUIREMENT
                                   -------------  -------------  -------------  -------------  -------------  -------------
                                                            (DOLLARS IN THOUSANDS)
<S>                                <C>            <C>            <C>            <C>            <C>            <C>
CAPITAL COMPONENTS:
  Tier 1 capital.................  $   1,952,045  $   2,070,554  $   2,355,057  $   2,395,580  $   2,587,071
  Tier 2 capital.................        702,652        626,903        591,266        551,074        601,102
                                   -------------  -------------  -------------  -------------  -------------
    Total risk-based capital.....  $   2,654,697  $   2,697,457  $   2,946,323  $   2,946,654  $   3,188,173
                                   -------------  -------------  -------------  -------------  -------------
                                   -------------  -------------  -------------  -------------  -------------
  Risk-weighted assets...........  $  21,992,647  $  22,419,516  $  25,179,489  $  26,390,288  $  28,862,340
                                   -------------  -------------  -------------  -------------  -------------
                                   -------------  -------------  -------------  -------------  -------------
  Quarterly average assets.......  $  23,624,622  $  23,868,729  $  27,073,158  $  28,496,355  $  30,334,507
                                   -------------  -------------  -------------  -------------  -------------
                                   -------------  -------------  -------------  -------------  -------------
CAPITAL RATIOS:
  Total risk-based capital.......          12.07%         12.03%         11.70%         11.17%         11.05%         8.0%
  Tier 1 risk-based capital......           8.88           9.24           9.35           9.08           8.96          4.0
  Leverage ratio(1)..............           8.26           8.67           8.70           8.41           8.53          4.0
</TABLE>
 
- ------------------------
 
(1) Tier 1 capital divided by quarterly average assets (excluding certain
    intangible assets).
 
    For regulatory purposes, our capital computations are based on risk-adjusted
Tier 1 and total capital. Our Tier 1 and total risk-based capital ratios were
9.08% and 11.17%, respectively, at December 31, 1996 compared to 8.96% and
11.05%, respectively, at December 31, 1997. The decrease in the capital ratios
was attributable to the redemption of $135 million of preferred stock in the
third quarter of 1997, partly offset by retained earnings growing faster than
both risk-weighted assets and average assets. As of December 31, 1997,
management believes the capital ratios of our bank met all regulatory minimums
of a "well-capitalized" institution.
 
YEAR ENDED DECEMBER 31, 1996 COMPARED TO YEAR ENDED DECEMBER 31, 1995
 
    Net income in 1996 was $249 million compared with $313 million in 1995.
Excluding the effects of the $72 million after-tax charge for merger-integration
expense, net income improved as a result of higher net interest income, higher
noninterest income, and lower credit loss provision expense than in 1995.
 
    Net income applicable to common stock was $238 million, or $1.36 per diluted
common share, in 1996 compared with $302 million, or $1.73 per diluted common
share, in 1995.
 
    The return on average assets was 0.89% in 1996 versus 1.22% in 1995. The
return on average common equity was 10.24% in 1996 compared with 13.73% in 1995.
 
    Net interest income on a taxable-equivalent basis increased by $23 million,
or 2 percent, over 1995. Average loans increased $1,753 million, or 9 percent,
and the net interest margin decreased 30 basis points to 4.75%.
 
    Noninterest income increased by $23 million, or 6 percent, over 1995.
Service charges on deposits, trust and investment management fees, credit card
merchant fees, brokerage commissions and fees, securities gains, and other
revenue collectively grew 11 percent and accounted for $32 million of the growth
in noninterest income. This increase was partially offset by a $6 million
decrease in foreign exchange trading gains.
 
                                      S-57
<PAGE>
    The provision for credit losses was $40 million in 1996, $13 million, or 25
percent, lower than in 1995, reflecting the improved quality of the loan
portfolio.
 
    Noninterest expense, excluding merger and integration expense, increased by
$39 million, or 4 percent, from 1995. Personnel-related expense increased $21
million, or 4 percent, due partially to increased contract labor used to augment
staffing requirements as a residual effect of the merger. Net occupancy expense
increased $10 million, or 11 percent, due to a $12 million one-time charge in
1996 related to former banking facilities. This was offset by a 2 percent
decrease in net occupancy expense due to the closure of 20 branches late in the
third quarter of 1996. Credit card processing expense increased $6 million, or
19 percent, in 1996 due to higher merchant volumes. Advertising and public
relations expense increased $8 million, or 38 percent, over 1995 due primarily
to expanded activities in 1996 to increase awareness of our bank, following the
April 1, 1996 combination of Union Bank and BanCal Tri-State Corporation and its
subsidiary. In 1996, regulatory authority assessments expense declined $19
million, or 83 percent, primarily because the Federal Deposit Insurance
Corporation decided to eliminate insurance assessments for all of 1996. Merger
and integration expense was $117 million in 1996.
 
    Income tax expense was $30 million lower in 1996 than in 1995, primarily due
to lower taxable income. The effective rate increased from 38% in 1995 to 40% in
1996 primarily due to a $3 million after-tax benefit recognized in 1995 from a
favorable settlement of an Internal Revenue Service examination of 1989 and
1990.
 
    Total loans at December 31, 1996 were $21.0 billion, an increase of $0.6
billion, or 3 percent, over year-end 1995. Commercial, financial and industrial
loans declined $188 million, or 2 percent, from the previous year, primarily due
to planned reductions from a portfolio overlap arising from the merger and a
reduction in certain low margin lending. At year-end 1996, construction loans
decreased $12 million, or 3 percent, while commercial mortgages increased $455
million, or 21 percent, from 1995. This increase in commercial mortgages
reflected the continuing improvement in the West Coast economy, particularly the
real estate sector. It was primarily attributable to new originations of
mini-perm loans, ranging in size from $1 million to $10 million, resulting from
a vigorous marketing program. At December 31, 1996 residential loans were $319
million, or 12 percent, higher than the previous year as the favorable interest
rate environment and a stronger housing market continued to generate significant
opportunities for residential mortgage lenders. Consumer loans increased $136
million, or 4 percent, from 1995 due primarily to increases in direct and
indirect auto loans for used vehicles, partially offset by a decrease in home
equity balances.
 
    Total nonperforming assets were $157 million at December 31, 1996, $90
million, or 36 percent, lower than one year earlier. The decline was primarily
attributable to a $27 million, or 33 percent, reduction in nonaccrual
commercial, financial and industrial loans and a $33 million, or 82 percent,
reduction in nonaccrual construction loans, due to a combination of note sales,
payoffs, and upgrades. Foreclosed assets, primarily other real estate owned,
decreased by $8 million, or 23 percent, from 1995, due to sales of individual
assets. Net loan charge-offs in 1996 were $71 million compared to net loans
charged off of $61 million in 1995. Recoveries of loans previously charged off
decreased by $24 million, despite an increase in the percentage of recoveries in
1996 to loans charged off in the previous year from 26.44% in 1995 to 35.95% in
1996. Loans charged off in 1996 decreased by $14 million due to a reduction in
new nonperforming assets in 1996 and a reduction in nonaccrual and
underperforming loans, partly offset by a $12 million increase in consumer loans
charged off, primarily attributable to credit card loans.
 
    At December 31, 1996, the Tier 1 risk-based capital ratio was 9.08% and the
total risk-based capital ratio was 11.17% compared with ratios of 9.35% and
11.70%, respectively, at December 31, 1995.
 
                                      S-58
<PAGE>
QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
 
    GENERAL
 
    Market risk is the risk of loss to future earnings, to fair values, or to
future cash flows that may result from changes in the price of a financial
instrument. The value of a financial instrument may change as a result of
changes in interest rates, foreign currency exchange rates, commodity prices,
equity prices and other market changes that affect market risk sensitive
instruments. Market risk is attributed to all market risk sensitive financial
instruments, including securities, loans, deposits, borrowings, as well as
derivative instruments. Our exposure to market risk is a function of its asset
and liability management activities, its trading activities for its own account,
and its role as a financial intermediary in customer-related transactions. The
objective of market risk management is to avoid excessive exposure of our
earnings and equity to loss and to reduce the volatility inherent in certain
financial instruments.
 
    The management of market risk is governed by policies reviewed and approved
annually by our Board of Directors. Our Board of Directors delegates
responsibility for market risk management to the Asset & Liability Management
Committee (the "A&L Management Committee"), who reports quarterly to our Board
of Directors on activities related to the management of market risk. As part of
the management of our market risk, the A&L Management Committee may direct
changes in the mix of assets and liabilities and the use of derivative
instruments such as interest rate swaps, caps and floors. The A&L Management
Committee also reviews and approves all major funding, market risk-management
programs, and market risk limits. The Chief Financial Officer, as chairman of
the A&L Management Committee, is responsible for companywide management of
market risk. The Treasurer is responsible for implementing funding, investment,
and hedging strategies designed to manage this risk. On a day-to-day basis, the
oversight of market risk management takes place at a centralized level within
the Risk Monitoring Unit. The Risk Monitoring Unit is responsible for measuring
risks to ensure compliance with all market risk limits and guidelines
incorporated within the policies and procedures established by the A&L
Management Committee. The Risk Monitoring Unit reports monthly to the A&L
Management Committee on the effectiveness of our hedging activities, on trading
risk exposures, and on compliance with policy limits. In addition, periodic
reviews by internal audit, regulators and independent accountants provide
further evaluation of controls over the risk management process.
 
    We have separate and distinct methods for managing the market risk
associated with our trading activities and our asset and liability management
activities, as described below.
 
    INTEREST RATE RISK MANAGEMENT (OTHER THAN TRADING)
 
    We engage in asset and liability management activities with the objective of
reducing adverse changes in earnings as a result of changes in interest rates.
The management of interest rate risk relates to the timing and magnitude of the
repricing of assets compared to liabilities and has, as its objective, the
control of risks associated with movements in interest rates.
 
    The Asset & Liability Management Policy approved by our Board of Directors
requires monthly monitoring of interest rate risk by the A&L Management
Committee. As part of the management of our interest rate risk, the A&L
Management Committee may direct changes in the composition of the balance sheet
and the extent to which we utilize off-balance sheet derivative instruments such
as interest rate swaps, floors, and caps.
 
    Our balance sheet is "asset-sensitive", which means that assets generally
reprice more quickly than liabilities. An asset-sensitive balance sheet tends to
reduce net interest income when interest rates decline and to increase net
interest income when interest rates rise.
 
    One method of measuring interest rate risk is by measuring the interest rate
sensitivity gap, which is the difference between earning assets and liabilities
maturing or repricing within specified periods. The table on page 59 presents
such an analysis, which reflects certain assumptions as to the rate sensitivity
of
 
                                      S-59
<PAGE>
deposits without contractual maturities or repricing dates. These include demand
deposits, money market demand accounts, and savings deposits. Additional
assumptions such as prepayment estimates for residential mortgages and
mortgage-backed securities are made to reflect the probable behavior of those
assets. The section of the table on page S-62 entitled Interest Rate Risk
Management Positions presents the effects of the securities portfolio and of
derivatives used for hedging, such as interest rate swaps and floors, in
reducing the interest rate sensitivity gap primarily for LIBOR-based loans.
 
    The table on page S-62 shows that our assets that are rate sensitive within
one year exceeded liabilities within that same period by $4.9 billion at
December 31, 1997. Adjusted for the effects of the securities portfolio and
derivatives used for hedging, this cumulative gap was reduced to $2.5 billion.
 
    Gap analysis has significant limitations as a method for measuring interest
rate risk since changes in interest rates do not affect all categories of assets
and liabilities in the same way. To address these limitations, we use a
simulation model to quantify the impact of changing interest rates on net
interest income. A frequency distribution of simulated 12-month net interest
income outcomes based on rate scenarios produced through a Monte Carlo rate
generation process is prepared monthly to determine statistically the mean net
interest income. The amount of Earnings at Risk, defined as the potential
negative change in net interest income, is measured at a 97.5 percent confidence
level and is managed within the limit established in our Board of Director's
Asset & Liability Policy at 5 percent of mean net interest income. Based on the
December 31, 1997 balance sheet, the Earnings at Risk was $23.0 million or 1.80%
of mean net interest income.
 
    An additional limit established by our Board of Director's Asset & Liability
Policy is that the negative change in simulated net interest income for 12
months under single interest rate shock scenarios, up or down 200 basis points,
must be no more than 8 percent of the mean net interest income. Based on the
December 31, 1997 balance sheet, the negative change for a downward shock of 200
basis points was $51.8 million or 4.05% of mean net interest income.
 
    TRADING ACTIVITIES
 
    We enter into trading account activities primarily as a financial
intermediary for customers, and, to a lesser extent, for our own account. By
acting as a financial intermediary, we are able to provide our customers with
access to a wide range of products from the securities, foreign exchange, and
derivatives markets. In acting for our own account, we may take positions in
some of these instruments with the objective of generating trading profits.
These activities expose us to two primary types of market risk: interest rate
and foreign currency exchange risk.
 
    In order to manage interest rate and foreign currency exchange risk
associated with our trading activities, we use a variety of non-statistical
methods including: position limits for each trading activity, daily marking of
all positions to market, daily profit and loss statements, position reports, and
independent verification of all inventory pricing. Additionally, the Risk
Management Unit reports positions and profits and losses daily to the Treasurer
and trading managers and weekly to the Chief Financial Officer. The A&L
Management Committee is provided reports on a monthly basis. We believe that
these procedures, which stress timely communication between the Risk Management
Unit and senior management, are the most important elements of the risk
management process.
 
    We use a form of Value at Risk methodology to measure the overall market
risk inherent in our trading account activities. Under this methodology,
management statistically calculates, with 97.5 percent confidence, the potential
loss in fair value that we might experience if an adverse shift in market prices
were to occur within a period of 5 business days. The amount of Value at Risk is
managed within limits well below the maximum limit established by Board policy
at 0.5% of shareholders' equity. The Value at Risk model incorporates a number
of key assumptions, including assumed holding period and historical volatility
based on 3 years of historical market data updated quarterly.
 
                                      S-60
<PAGE>
    During 1997 our foreign exchange trading Value at Risk averaged $73 thousand
and peaked at $147 thousand. The low Value at Risk was $32 thousand.
Correspondingly, our securities trading Value at Risk averaged $558 thousand and
peaked at $717 thousand. The low Value at Risk was $439 thousand.
 
    Our interest rate derivatives contracts include $2.4 billion of derivative
contracts entered into as an accommodation for customers. We act as an
intermediary and we match these contracts at a profit with contracts with The
Bank of Tokyo-Mitsubishi or other dealers, thus neutralizing the related market
risk. We maintain responsibility for the credit risk associated with these
contracts.
 
LIQUIDITY RISK
 
    Liquidity risk represents the potential for loss as a result of limitations
on our ability to adjust its future cash flows to meet the needs of depositors
and borrowers and to fund operations on a timely and cost-effective basis. The
Asset & Liability Management Policy approved by our Board of Directors requires
quarterly reviews of our liquidity by the A&L Management Committee, which is
composed of bank senior executives. Our liquidity draws upon the strength of our
extensive retail and commercial market business franchise, coupled with the
ability to obtain funds for various terms in a variety of domestic and
international money markets. Liquidity is managed through the funding and
investment functions of the Treasury Division.
 
    Core deposits provide us with a sizable source of relatively stable and
low-cost funds. In the third quarter of 1998, lower cost sources of funds, which
include noninterest bearing deposits and interest bearing core deposits, funded
63 percent of average earning assets. Most of the remaining funding was provided
by short-term borrowing in the form of negotiable certificates of deposit,
foreign deposits, federal funds purchased and securities sold under repurchase
agreements, and other borrowings. In the third quarter 1998, we increased our
Commercial Paper program by $100 million.
 
    Our average core deposits, which include demand deposits, money market
demand accounts, and savings and consumer time deposits, combined with average
common shareholder's equity, funded 61 percent of average total assets of $29.7
billion for the year ended December 31, 1997. Most of the remaining funding was
provided by short-term borrowings in the form of negotiable certificates of
deposit, foreign deposits, federal funds purchased and securities sold under
repurchase agreements, commercial paper and other borrowings.
 
    Liquidity may also be provided by the sale or maturity of assets. Such
assets include interest bearing deposits in banks, federal funds sold and
securities purchased under resale agreements, and trading account securities.
The aggregate of these assets averaged $1.8 billion during 1997. Additional
liquidity may be provided by investment securities available for sale which
amounted to $2.5 billion at December 31, 1997, and by loan maturities. At
December 31, 1997, $6.5 billion of loans were scheduled to mature within one
year.
 
                                      S-61
<PAGE>
    The following table summarizes our interest rate sensitivity based on
expected repricings in the time frames indicated for the balance sheet and
interest rate derivatives as of December 31, 1997.
 
<TABLE>
<CAPTION>
                                                                           DECEMBER 31, 1997
                                                       ----------------------------------------------------------
                                                                    AMOUNTS MATURING OR REPRICING IN
                                                       ----------------------------------------------------------
                                                        0-12 MONTHS     1-5 YEARS    AFTER 5 YEARS      TOTAL
                                                       -------------  -------------  -------------  -------------
                                                                         (DOLLARS IN THOUSANDS)
<S>                                                    <C>            <C>            <C>            <C>
ASSETS:
  Federal funds sold and securities purchased under
    resale agreements................................  $      24,335  $    --        $    --        $      24,335
  Interest bearing deposits in banks.................        633,421       --             --              633,421
  Trading account assets.............................        394,313       --             --              394,313
  Loans..............................................     17,320,010      3,926,152      1,495,246     22,741,408
  Other assets(1)(2).................................      1,217,060      1,111,518      1,736,049      4,064,627
                                                       -------------  -------------  -------------  -------------
      Total assets (except securities)...............     19,589,139      5,037,670      3,231,295     27,858,104
                                                       -------------  -------------  -------------  -------------
                                                       -------------  -------------  -------------  -------------
LIABILITIES AND SHAREHOLDERS' EQUITY:
  Interest bearing deposits:
    Interest bearing checking(1)(3)..................        180,074      1,260,520       --            1,440,594
    Money market demand accounts(1)(3)...............      1,353,636      2,671,392       --            4,025,028
    Savings(1)(3)....................................        166,562      1,165,932       --            1,332,494
    Other time deposits(1)...........................      7,208,342        434,309          6,063      7,648,714
  Federal funds purchased and securities sold under
    repurchase agreements............................      1,335,884       --             --            1,335,884
  Other borrowed funds...............................      1,442,585       --             --            1,442,585
  Subordinated capital notes.........................        348,000       --             --              348,000
  Demand deposit accounts(1)(4)......................      2,654,863      6,194,681       --            8,849,544
  Other liabilities(1)(2)............................       --             --            1,483,123      1,483,123
  Shareholders' equity(2)............................       --             --            2,679,299      2,679,299
                                                       -------------  -------------  -------------  -------------
      Total liabilities and shareholders' equity.....  $  14,689,946  $  11,726,834  $   4,168,485  $  30,585,265
                                                       -------------  -------------  -------------  -------------
                                                       -------------  -------------  -------------  -------------
  Gap before risk management positions...............  $   4,899,193  $  (6,689,164) $    (937,190) $  (2,727,161)
  Cumulative gap before risk management positions....  $   4,899,193  $  (1,789,971) $  (2,727,161)
INTEREST RATE RISK MANAGEMENT POSITIONS:
  Securities(1)......................................        366,467      2,214,199        146,495      2,727,161
  Interest rate swaps................................       (425,000)       425,000       --             --
  Interest rate floors(5)............................     (2,350,000)     2,350,000       --             --
                                                       -------------  -------------  -------------  -------------
  Gap adjusted for risk management positions.........  $   2,490,660  $  (1,699,965) $    (790,695) $    --
                                                       -------------  -------------  -------------  -------------
                                                       -------------  -------------  -------------  -------------
  Cumulative gap adjusted for risk management
    positions........................................  $   2,490,660  $     790,695  $    --        $    --
                                                       -------------  -------------  -------------  -------------
                                                       -------------  -------------  -------------  -------------
</TABLE>
 
- ------------------------
 
(1) Certain balance sheet classifications used for interest rate sensitivity
    analysis do not conform to the Consolidated Balance Sheets on F-3.
 
(2) Items that neither reprice nor mature are included in the "After 5 Years"
    column.
 
(3) Interest rate sensitivity of non-maturity deposit accounts are based on
    assumptions for a declining interest rate scenario since our balance sheet
    is asset-sensitive.
 
(4) 70 percent of the demand deposit account balance is assumed to be "core"
    deposits, which are not sensitive to interest rate changes.
 
(5) Floors purchased affect interest rate sensitivity in a declining interest
    rate scenario.
 
                                      S-62
<PAGE>
YEAR 2000
 
    The year 2000 problem exists because many computer programs use only the
last two digits to refer to a year. This convention could affect date-sensitive
calculations that treat "00" as the year 1900, rather than 2000. Another issue
is that the year 2000 is a leap year and some programs may not properly provide
for February 29, 2000.
 
    The following discussion of the implications of the year 2000 problem for us
contains numerous forward-looking statements based on inherently uncertain
information. The cost of the project and the date on which we plan to complete
the internal year 2000 modifications are based on management's best estimates,
which were derived utilizing a number of assumptions of future events including
the continued availability of internal and external resources, third party
modifications and other factors. (See details with respect to costs for year
2000 on page S-29). However, there can be no guarantee that these estimates will
be achieved and actual results could differ. Moreover, although we believe we
will be able to make the necessary modifications in advance, there can be no
guarantee that failure to modify the systems would not have a material adverse
effect on us.
 
    In addition, we place a high degree of reliance on computer systems of third
parties, such as customers, vendors, and other financial and governmental
institutions. Although we are assessing the readiness of these third parties and
preparing contingency plans, there can be no guarantee that the failure of these
third parties to modify their systems in advance of December 31, 1999, would not
have a material adverse effect on us.
 
    READINESS PREPARATION
 
    Many of our critical operations are not presently ready to operate normally
in the year 2000 and beyond, although preparations are underway to correct this.
In 1997, we alerted our business customers of the year 2000 problem and are now
assessing the readiness preparations of our major customers and suppliers.
Resolution of the year 2000 problem is among our highest priorities, and a
comprehensive program has been established to address its many aspects.
 
    We are preparing for the century change with an enterprise-wide year 2000
program. As part of the program, we have identified all of the major application
and processing systems, and sought external and internal resources to replace
and test the systems. Purchased software, internally developed systems and
systems supported by external parties are being tested as part of the program.
Customers and vendors which have significant relationships with us are being
evaluated to determine whether they are adequately preparing for the year 2000.
In addition, contingency plans are being developed to reduce the impact of some
potential events that may occur. However, there can be no guarantee that the
systems of vendors or customers with whom we do business will be year 2000
compliant on a timely basis, or that contingency plans will shield operations
from failures that may occur.
 
    Our year 2000 program is comprised of numerous individual projects which
address the following broad areas: data processing systems, telecommunications
and data networks, building facilities and security systems, vendor risk,
customer risk, contingency planning, and communications. There are over 2,000
individual projects identified. The projects vary in size, importance and
materiality: from large undertakings, such as remediating complicated data
systems and organizing the process of assessing the readiness of customers, to
smaller, but still important, projects such as installing compliant computer
utility systems or assuring that processor-controlled systems in individual
buildings will perform properly. The program continues to evolve as new projects
are identified to keep up with increased understanding of year 2000 implications
and evolving external requirements. Virtually all of the projects currently
identified have begun, while more than a third have been completed.
 
    Projects are assigned a priority indicating the importance of the function
to our continuing operation. This prioritization facilitates reporting on
projects based on their relative importance. We have prioritized
 
                                      S-63
<PAGE>
projects as Critical and Non-Critical. Critical projects are further prioritized
as Mission Critical and Other Critical. Mission Critical projects are defined
as:
 
    - systems vital to the continuance of a broad core business activity;
 
    - functions, the interruption of which for longer than 3 days would threaten
      the viability of UNBC;
 
    - functions that provide the environment and infrastructure necessary to
      continue the broad core business activities.
 
    Other Critical projects are defined as:
 
    - other customer and accounting systems;
 
    - functions supporting delivery of information and service to customers;
 
    - administrative systems, the interruption of which for longer than 2 weeks
      would cause severe business impact;
 
    - functions that provide the environment and infrastructure necessary for
      delivery of the above systems and functions.
 
    We plan to complete all projects currently identified prior to the year
2000, with special emphasis placed on those prioritized as Mission Critical or
Other Critical. Failure to complete an Other Critical project would not
necessarily have a material adverse effect on UNBC.
 
    The most important projects are the Mission Critical application systems
upon which we rely for our principal business functions. Most of these systems
have been renovated. We expect to have all of these systems renovated by
December 31, 1998, and tested by March 30, 1999.
 
    In addition to testing individual systems, we also plan to conduct
integrated contingency testing of our Mission Critical and many other systems
during 1999 in a separate computer environment where machine dates will be set
forward in order to identify and correct problems which might not otherwise
become evident until the actual end of the century.
 
    We do not significantly rely on embedded technology in our critical
processes. Embedded technology does control some building security and
operations such as power management, ventilation, and elevator control. All
building facilities are presently being evaluated, and we expect for all systems
using embedded technology to be confirmed as year 2000 ready by June 1999.
 
    We are reliant on vendors and customers, and year 2000 issues with both
groups are being addressed. Over 300 vendors, upon whom there is significant
reliance, have been identified and inquiries have been made regarding their year
2000 readiness plans and status. Written risk assessments are being completed on
each and appropriate measures to minimize risk will be undertaken with those
vendors that appear to pose a significant risk. Risk assessments of the critical
vendors are scheduled to be completed by December 1998, and replacements
effected where necessary by June 1999. We, however, have no viable alternatives
for some suppliers, such as power distribution and local telephone companies.
These companies are still being evaluated and the results will be used as
information for contingency planning. As with all financial institutions, we
place a high degree of reliance on the systems of other institutions, including
governmental agencies, to settle transactions. Principal settlement methods
associated with major payment systems will be tested as part of their associated
system projects.
 
    We are also reliant on our customers to make necessary preparations for the
year 2000 so that their business operations will not be interrupted, thus
threatening their ability to honor their financial commitments. Over 2,500
borrowers, capital market counterparties, funding sources, and large depositors
(collectively referred to as "customers") have been identified as having
financial volumes sufficiently large to warrant inquiry and assessment of their
year 2000 preparation. The financial volumes included, among other components,
loans and unused commitments, collected deposit balances, Automated Clearing
 
                                      S-64
<PAGE>
House, foreign exchange, and derivatives. At September 30, 1998, inquiries and
initial written assessments had been completed for 90% of the identified
financial volumes. Assessments for the remaining 10% continue.
 
    In the initial assessments, customers were classified as representing low,
medium and high risks. Approximately 80% were classified as low risk, 18% as
medium risk and 2% as high risk. High risk customers include those which failed
to respond to the inquiry or which appear to pose a high degree of risk of not
being ready for year 2000.
 
    The population of customers with loans and unused commitments outstanding
("borrowers") pose the highest level of concern for any lender. As of September
30, 1998, the assessment of these borrowers resulted in the following
assignments of risk: 79% low risk, 19% medium risk and 2% high risk.
 
    Ongoing assessments will be made for all levels of risk. Customers with low
risk will be reassessed semi-annually, while customers with medium and high risk
will be reassessed quarterly. Risk mitigation plans will be developed for
customers with high risk. The risk mitigation plan will evaluate whether year
2000 issues will materially affect the customer's cash flow, asset account
values related to its balance sheet, and/or collateral pledged to us. The risk
mitigation plan utilizes the normal credit process that we employ to manage
credit risk and requires the concurrence of a credit administrator.
 
    RISKS
 
    The principal risks associated with the year 2000 problem can be grouped
into three categories. The first is the risk that the we do not successfully
ready our operations for the next century. The second is the risk of disruption
of our operations due to operational failures of third parties. The third is the
risk of business interruption among fund providers and obligors such that
expected funding and repayment does not take place.
 
    The only risk largely under our control is preparing our internal operations
for the year 2000. We, like other financial institutions, are heavily dependent
on our computer systems. The complexity of these systems and their
interdependence make it impractical to convert to alternative systems without
interruptions in the event necessary modifications are not completed on
schedule. Management believes it will be able to make the necessary
modifications on schedule.
 
    Failure of third parties may jeopardize our operations, but how seriously
depends on the nature and duration of such failures. The most serious impact on
our operations from vendors would result if basic services such as
telecommunications, electric power suppliers, and services provided by other
financial institutions and governmental agencies were disrupted. Significant
public disclosure of the state of readiness among basic infrastructure and other
suppliers has not generally been available. Although our inquiries are underway,
we do not yet have the information to estimate the likelihood of significant
disruptions among our suppliers.
 
    Operational failures among our sources of major funding, larger borrowers
and capital market counterparties could affect their ability to continue to
provide funding or meet obligations when due. Similar to the situation outlined
above with suppliers, public information has been scant. Although our inquiries
are underway, we do not yet have the information to estimate the likelihood of
significant disruptions among our funding sources and obligors.
 
    PROGRAM ASSESSMENT
 
    The Internal Audit Division and the National Bank Examiners regularly assess
our year 2000 preparations. In addition, a leading information technology
consulting and services firm was engaged to conduct a third party review of the
our year 2000 program. We are considering the recommendations provided by the
firm to further enhance the year 2000 program.
 
                                      S-65
<PAGE>
    CONTINGENCY PLANS
 
    We are developing year 2000 remediation contingency plans and business
resumption contingency plans specific to the year 2000. Remediation contingency
plans address the actions to be taken if the current approach to remediating a
system is falling behind schedule or otherwise appears in jeopardy of failing to
deliver a year 2000-ready system when needed. Business resumption contingency
plans address the actions that would be taken if critical business functions
cannot be carried out in the normal manner upon entering the next century due to
system or supplier failure.
 
    Our contingency planning strategy is a four-phase process: Organizational
Planning Guidelines, Business Impact Analysis, Plan Development for Individual
Operating Units and Validation of Plans. The first two phases have been
completed. We identified the following system-wide areas of concern, assigned to
each a level of potential risk and a probability of occurrence and determined
whether a contingency plan was warranted.
 
    The areas of concern are as follows:
 
    - Global telecommunications and network
 
    - Enterprise information systems
 
    - Operational disruptions
 
    - Vendors and service providers
 
    The level of potential risk was rated as high, moderate or low and the
probability of occurrence was rated as high, moderate or low. Those areas with a
low or moderate level of potential risk and a low probability of occurrence do
not require a contingency plan. For any other combination, the development of a
contingency plan is required. The development and validation of the plans are
expected to be completed by June 1999.
 
    OTHER RELATED DISCLOSURES
 
    Certain of our subsidiaries are registered investment advisers or
broker-dealers that make publicly available separate year 2000 reports.
Additional year 2000 information may be found in those reports.
 
EURO CONVERSION
 
    On January 1, 1999, 11 European countries who joined the Economic and
Monetary Union transitioned into a single currency (the "Euro") and a single
central bank -- the European Central Bank. On that date, the exchange rates of
the national currencies of the 11 countries were fixed and all financial
transactions will be settled in Euros.
 
    We have completed our analysis of the bank-wide impact and have implemented
a project plan in anticipation of the Euro conversion. We are now fully
operational to settle transactions in the Euro.
 
                                      S-66
<PAGE>
                                    BUSINESS
 
    UnionBanCal Corporation, or "UNBC," is a California-based bank holding
company. Its principal subsidiary is Union Bank of California, N.A. Union Bank
of California is the third largest commercial bank in California, based on both
total assets and total deposits in California, and is among the 30 largest in
the United States. Having roots as far back as 1864, we are among the oldest
banks on the West Coast. At September 30, 1998, we had 244 full-service branches
in California, six full-service branches in Oregon and Washington, two
facilities in Texas and New York and 18 offices abroad. Our bank was formed
through the combination of Union Bank and BanCal Tri-State Corporation in 1996.
We are presently approximately 82% owned by The Bank of Tokyo-Mitsubishi.
 
    We provide a wide range of financial products and services to retail
customers, small businesses, middle-market companies and major corporations.
These products and services include a variety of personal and commercial
financial services, including:
 
    - consumer and small-business lending,
 
    - corporate and international lending and cash management,
 
    - treasury,
 
    - trust,
 
    - investment advisory services.
 
    Most of our customers are located in California, the nation's most populous
state with over 32 million residents.
 
    As of September 30, 1998, we had total assets of $31.4 billion, total
deposits of $23.7 billion and total shareholders' equity of $3.0 billion. We had
net income for the nine months ended September 30, 1998 of $352.4 million, and
net income per diluted share of $2.01 after giving effect to the December 1998
3-for-1 stock split.
 
BANKING SERVICES
 
    UNBC's operations are divided into four primary segments: the Community
Banking Group; the Commercial Financial Services Group; the Trust and Private
Financial Services Group; and the International Banking Group.
 
                                      S-67
<PAGE>
COMMUNITY BANKING GROUP
 
    The following table sets forth the historical results of operations for the
Community Banking Group:
 
<TABLE>
<CAPTION>
                                                                      COMMUNITY BANKING GROUP
                                                           ----------------------------------------------
                                                             AS OF AND FOR THE       AS OF AND FOR THE
                                                            YEARS ENDED DECEMBER       PERIODS ENDED
                                                                    31,                SEPTEMBER 30,
                                                           ----------------------  ----------------------
                                                              1996        1997        1997        1998
                                                           ----------  ----------  ----------  ----------
<S>                                                        <C>         <C>         <C>         <C>
RESULTS OF OPERATIONS:
(IN THOUSANDS)
Revenues
Net interest income......................................  $  658,144  $  682,782  $  511,212  $  504,709
Noninterest income.......................................     133,559     142,944     105,991     136,101
                                                           ----------  ----------  ----------  ----------
Total....................................................     791,703     825,726     617,203     640,810
Noninterest expense......................................     577,655     568,031     419,050     439,927
Credit expense (income)..................................      35,644      57,870      40,975      (3,059)
Performance center earnings(1)...........................       7,688      10,040       6,558       6,403
Income before income taxes...............................     186,092     209,865     163,736     210,345
 
BALANCE SHEET DATA (PERIOD AVERAGE):
(IN MILLIONS)
 
Total loans before performance centers(2)................  $    9,877  $    9,672  $    9,691  $    9,389
Total assets.............................................      10,991      10,626      10,632      10,329
Total deposits before performance centers(2).............      11,131      11,757      11,646      12,322
FINANCIAL RATIOS.........................................
  Return on average assets...............................        1.02%       1.17%       1.23%       1.63%
  Efficiency ratio.......................................       73.00%      68.80%      67.90%      68.70%
</TABLE>
 
- ------------------------
 
(1) Performance center earnings represent the allocation of net interest income,
    noninterest income and noninterest expense between the business segments for
    products and services originated in one segment but managed by another.
 
(2) Represents loans and deposits for each business segment before allocation
    between the segments of loans and deposits originated in one segment but
    managed by another.
 
    The Community Banking Group provides its customers with a full line of
checking and savings, investment, loan and fee-based banking products. For the
nine months ended September 30, 1998, average assets in this group were $10.3
billion, and average deposits were $12.3 billion.
 
    The group focuses on four major markets: consumers, businesses with sales
under $3 million, businesses with sales between $3 million and $20 million, and
middle market companies, including agricultural firms in central California and
in selected parts of Oregon and Washington. It serves over one million consumer
households and businesses through its 244 branches in California, six branches
in Oregon and Washington and its network of over 380 proprietary ATMs. Customers
may also access our services 24 hours a day by telephone or personal computer.
In addition, Community Banking offers automated teller and point-of-sale debit
services through our founding membership in the Star System, the largest shared
ATM network in the Western United States. The group is organized by service
delivery method, by markets and by geography. The primary sub-units of the group
are:
 
    - community banking branches, which serve consumers, businesses and, in
      certain locations, affluent individuals;
 
    - business banking centers, which serve businesses with sales between $3
      million and $20 million;
 
    - in-store branches, which also serve consumers and businesses;
 
                                      S-68
<PAGE>
    - middle market and agricultural lending offices; and
 
    - the Consumer Asset Management division, which is responsible for indirect
      auto finance, auto leasing, and residential real estate lending.
 
    Through alliances with other financial institutions, the group offers
additional products and services, such as credit cards, small-ticket leasing and
asset-based finance.
 
    Community Banking competes with larger banks by providing service quality
superior to that of its major competitors. We are recognized as among the
highest rated banks in California for customer service quality and satisfaction.
 
    The group's primary means of competing with community banks include its
large and convenient branch network and its reputation for innovative use of
technology to deliver banking services. We have the fifth largest branch network
among depository institutions in California. We also offer convenient banking
hours to consumers through our drive-through banking locations and selected
branches that are open seven days a week.
 
    Community Banking continues to enhance its customer service through the
innovative use of technology. We were among the first banks to team with Intuit
and Microsoft in the launches of their personal financial management software
products, Quicken-Registered Trademark- and Money-Registered Trademark- for
on-line banking. In 1996, we joined America Online's Banking Center as a charter
member. We also worked with Sony to develop the first interactive video banking
application of its kind on the West Coast. In December 1998, we jointly
announced with IBM the first of its kind comprehensive on-line banking system
using Lotus Notes-Registered Trademark- and Domino-Registered Trademark-.
 
    These services and enhancements have enabled UNBC to increase its share of
the consumer and small business markets. From June 30, 1994 to June 30, 1998,
UNBC's share of the California deposit market increased from 4.0% to 5.1%,
representing an annual growth rate of 6.3%. Similarly, since April 1996,
Community Banking has increased the number of households it serves by
approximately 5% annually.
 
    The group's strategies include continuing to build upon the more than one
million households and businesses it serves and broadening the range of
financial products and services it provides to existing customers. The group
uses direct mail marketing methods targeted at specific consumers to supplement
its traditional mass media advertising. We are also introducing a new
computer-driven sales system designed to foster cross-selling of our products.
The new system uses improved software to prompt sales staff to offer customers
additional products and services, based on a customer profile. We have installed
the new system in 40 of our branches, and we anticipate full implementation
within 18 months.
 
    The group will continue to use varied pricing strategies to encourage
customers to use lower-cost methods of delivery to receive our products and
services. Community Banking is emphasizing further development of existing
lower-cost product and service delivery methods, such as the Internet, video
kiosks and loans-by-phone, and is expanding its Direct Banking Center, which
offers products, services and technical support for home banking via the
telephone and computer.
 
    Community Banking competes with a number of commercial banks, savings
associations and credit unions, as well as more specialized financial services
providers, such as investment brokerage companies, consumer finance companies,
and residential real estate lenders. The group's primary competitors are other
major depository institutions such as Bank of America, California Federal,
Washington Mutual and Wells Fargo, as well as smaller community banks in the
markets in which we operate.
 
                                      S-69
<PAGE>
COMMERCIAL FINANCIAL SERVICES GROUP
 
    The following table sets forth the historical results of operations for the
Commercial Financial Services Group:
 
<TABLE>
<CAPTION>
                                                                COMMERCIAL FINANCIAL SERVICES GROUP
                                                           ----------------------------------------------
                                                             AS OF AND FOR THE       AS OF AND FOR THE
                                                            YEARS ENDED DECEMBER       PERIODS ENDED
                                                                    31,                SEPTEMBER 30,
                                                           ----------------------  ----------------------
                                                              1996        1997        1997        1998
                                                           ----------  ----------  ----------  ----------
<S>                                                        <C>         <C>         <C>         <C>
RESULTS OF OPERATIONS:
(IN THOUSANDS)
Revenues
Net interest income......................................  $  401,912  $  440,804  $  321,600  $  360,625
Noninterest income.......................................      78,238     100,316      75,450      82,638
                                                           ----------  ----------  ----------  ----------
Total....................................................     480,150     541,120     397,050     443,263
Noninterest expense......................................     201,870     231,906     166,305     188,328
Credit expense (income)..................................      14,362      18,872      15,065      15,963
Performance center earnings(1)...........................       4,141       3,926       2,968       2,037
Income before income taxes...............................     268,059     294,268     218,648     241,009
 
BALANCE SHEET DATA (PERIOD AVERAGE):
(IN MILLIONS)
 
Total loans before performance centers(2)................  $    8,286  $    9,329  $    9,178  $   10,783
Total assets.............................................       9,287      10,513      10,344      12,005
Total deposits before performance centers(2).............       3,959       4,875       4,684       5,844
FINANCIAL RATIOS.........................................
  Return on average assets...............................        1.72%       1.65%       1.69%       1.63%
  Efficiency ratio.......................................       42.00%      42.90%      41.90%      42.50%
</TABLE>
 
- ------------------------
 
(1) Performance center earnings represent the allocation of net interest income,
    noninterest income and noninterest expense between the business segments for
    products and services originated in one segment but managed by another.
 
(2) Represents loans and deposits for each business segment before allocation
    between the segments of loans and deposits originated in one segment but
    managed by another.
 
    The Commercial Financial Services Group offers a variety of commercial
financial services, including commercial and project loans, real estate
financing, asset-based and leveraged commercial financing, trade finance and
letters of credit, lease financing, customized cash management services and
selected capital markets products. The group's customers provide a significant
source of opportunities for us to sell products and services of other units of
the bank, including treasury, trust, and retail banking services. For the nine
months ended September 30, 1998, average assets in this group were $12.0
billion, and average deposits were $5.8 billion.
 
    Commercial Financial Services is divided into the following business units,
which serve specific markets and industries:
 
    - The Commercial Banking Group, which serves California middle-market
      companies and larger companies most often headquartered in the Western
      United States;
 
    - The Real Estate Industries Group, which serves real estate developers and
      real estate investment trusts;
 
    - The Specialized Lending Group, which serves companies operating in various
      industries, including oil and gas, utilities, media, communications,
      healthcare, finance and retailing; and
 
                                      S-70
<PAGE>
    - The Institutional and Deposit Markets Group, which serves title and escrow
      companies, retailers, bankruptcy trustees and other customers with large
      pools of deposits.
 
    The Commercial Customer Service Unit supports these business units by
providing centralized customer service support.
 
    The group competes with other banks primarily on the basis of its reputation
as a "business bank," the quality of its relationship managers, and the delivery
of superior customer service. We are recognized in California as having a
superior "business banking" reputation relative to other large banks. We are
also rated among the highest for our cash management services and systems.
Commercial Financial Services relationship managers are among the most
experienced in the industries that we target, and are trained to be consultative
advisers to our customers.
 
    The group's main strategy is to target industries and companies for which
the group can reasonably expect to be one of a customer's primary banks.
Consistent with its strategy, the group attempts to serve a large part of its
targeted customers' credit and depository needs.
 
    One result of this strategy is increased loan syndication activity. The
group has successfully increased non-interest revenue by expanding its loan
syndication activities, and it plans to continue to emphasize its operations in
this area. Loan syndication revenues increased by $6.2 million to $12.6 million
through the first nine months of 1998 compared to $6.4 million in 1996. This
increase is largely a result of our acting more frequently as agent and/or
underwriter in syndicated loans to middle market, real estate, and Specialized
Lending Group customers.
 
    We believe that an additional source of increased non-interest income will
come from our expanded participation in capital market transactions. As of
September 30, 1998, UNBC had approximately $58 million committed to a private
capital investment program, with plans to expand our investments in 1999.
Commercial Financial Services generally makes investments in funds and companies
with proven operating histories and in industries in which the group
specializes. We will seek to earn more fee income from loan securitizations,
particularly from commercial mortgages.
 
    As the group increasingly allocates its resources to those industries and
companies that fit its strategy, it will simultaneously de-emphasize efforts to
build banking relationships with companies outside of its target markets. We
expect to move away from junior syndicate roles in the market for large
corporate credits and toward the purchase of selected credits from the secondary
market for bank loans.
 
    In addition, Commercial Financial Services intends to use improved
technology to enhance the efficiency of its operations and the productivity of
its bankers and support staff. Among its planned system improvements are
enhancements to loan automation technology, improved software to measure
customer profitability, and enhanced information and contact management systems
for relationship officers.
 
    The group competes with a variety of other financial services companies.
Competitors include other major California banks, as well as regional, national
and international banks. In addition, we compete with investment banks,
commercial finance companies, leasing companies and insurance companies.
 
                                      S-71
<PAGE>
TRUST & PRIVATE FINANCIAL SERVICES GROUP
 
    The following table sets forth the historical results of operations for the
Trust & Private Financial Services Group:
 
<TABLE>
<CAPTION>
                                                             TRUST AND PRIVATE FINANCIAL SERVICES GROUP
                                                           ----------------------------------------------
                                                             AS OF AND FOR THE       AS OF AND FOR THE
                                                            YEARS ENDED DECEMBER       PERIODS ENDED
                                                                    31,                SEPTEMBER 30,
                                                           ----------------------  ----------------------
                                                              1996        1997        1997        1998
                                                           ----------  ----------  ----------  ----------
<S>                                                        <C>         <C>         <C>         <C>
RESULTS OF OPERATIONS:
(IN THOUSANDS)
Revenues
Net interest income......................................  $   11,539  $   20,995  $   14,332  $   16,770
Noninterest income.......................................     110,182     128,100      91,951     106,843
                                                           ----------  ----------  ----------  ----------
Total....................................................     121,721     149,095     106,283     123,613
Noninterest expense......................................     108,495     123,102      89,581      96,897
Credit expense (income)..................................         927         155         102         249
Performance center earnings(1)...........................        (674)     (1,472)       (929)        105
Income before income taxes...............................      11,625      24,366      15,671      26,572
 
BALANCE SHEET DATA (PERIOD AVERAGE):
(IN MILLIONS)
 
Total loans before performance centers(2)................  $       62  $      229  $      236  $      245
Total assets.............................................          94         303         322         297
Total deposits before performance centers(2).............         425         708         625         679
FINANCIAL RATIOS.........................................
  Return on average assets...............................        7.36%       4.74%       3.90%       7.34%
  Efficiency ratio.......................................       89.10%      82.60%      84.30%      78.40%
</TABLE>
 
- ------------------------
 
(1) Performance center earnings represent the allocation of net interest income,
    noninterest income and noninterest expense between the business segments for
    products and services originated in one segment but managed by another.
 
(2) Represents loans and deposits for each business segment before allocation
    between the segments of loans and deposits originated in one segment but
    managed by another.
 
    The Trust & Private Financial Services Group offers investment management
and administration services for a broad range of individuals and institutions.
The group services individual client needs through its trust and private
banking, investment management and brokerage products and services. It services
institutional client needs through traditional employee benefit and 401(k)
programs, global and domestic securities custody programs, securities lending
programs and corporate trust products. Trust & Private Financial Services also
provides investment management services for both individual and institutional
clients through HighMark Capital Management, Inc. and its family of proprietary
HighMark mutual funds. As of September 30, 1998, the group had over $90 billion
in assets under administration.
 
    The group is organized into five business divisions:
 
    - The Private Bank division focuses primarily on delivering integrated and
      customized financial services to high-net worth individuals with
      sophisticated financial needs. Specific products and services include
      trust and estate services, investment account management services,
      offshore trust services and customized deposit and credit products. The
      Private Bank's strategy is to expand its business by increasing its
      geographic market coverage and the breadth of its products and services.
      To support that strategy, The Private Bank expanded from nine offices to
      15 during 1998. In
 
                                      S-72
<PAGE>
      addition, it has shifted sales staff training efforts toward increased
      cross-selling of all of the bank's available products and services.
 
    - HighMark Capital Management, Inc. is a registered investment advisor that
      manages UNBC's proprietary HighMark family of mutual funds. It also
      provides investment management services to institutions, pension plans and
      individuals, including to clients of other divisions. HighMark Capital
      Management's strategy is to expand distribution of its mutual funds by
      targeting its marketing efforts at registered investment advisors and
      regional broker/dealers. In addition, HighMark is working with The Bank of
      Tokyo-Mitsubishi to distribute HighMark mutual funds offshore and to serve
      as a sub-advisor for funds managed by The Bank of Tokyo-Mitsubishi in
      Japan.
 
    - The Business Trust division provides businesses, government agencies,
      unions and non-profit organizations with trustee services, investment
      management and 401(k) valuation and record keeping services. Business
      Trust's strategy is to expand its third-party distribution network to
      include insurance companies, investment managers, brokers and mutual
      funds.
 
    - The Investment Services division consists of UBOC Investment Services,
      Inc., a registered broker/ dealer offering a full line of investment
      products to individuals and institutional clients, and UBOC Insurance
      Services. The division's primary strategy is to further penetrate UNBC's
      existing client base.
 
    - The Securities Services division is engaged in domestic and global
      securities custody, safekeeping, mutual fund accounting, securities
      lending and corporate trust services. Its client base includes financial
      institutions, businesses, government agencies, unions, investment managers
      and non-profit organizations. Securities Services is the only West Coast
      based provider of a full range of institutional financial services.
 
                                      S-73
<PAGE>
INTERNATIONAL BANKING GROUP
 
    The following table sets forth the historical results of operations for the
International Banking Group:
 
<TABLE>
<CAPTION>
                                                                    INTERNATIONAL BANKING GROUP
                                                           ----------------------------------------------
                                                             AS OF AND FOR THE       AS OF AND FOR THE
                                                            YEARS ENDED DECEMBER       PERIODS ENDED
                                                                    31,                SEPTEMBER 30,
                                                           ----------------------  ----------------------
                                                              1996        1997        1997        1998
                                                           ----------  ----------  ----------  ----------
<S>                                                        <C>         <C>         <C>         <C>
RESULTS OF OPERATIONS:
(IN THOUSANDS)
Revenues
Net interest income......................................  $   48,175  $   49,405  $   35,990  $   42,487
Noninterest income.......................................      62,373      62,238      46,887      49,758
                                                           ----------  ----------  ----------  ----------
Total....................................................     110,548     111,643      82,877      92,245
Noninterest expense......................................      72,719      64,874      48,942      48,765
Credit expense (income)..................................      (4,361)        234         216       2,915
Performance center earnings(1)...........................      (6,917)     (3,759)     (3,171)     (2,394)
Income before income taxes...............................      35,273      42,776      30,548      38,171
 
BALANCE SHEET DATA (PERIOD AVERAGE):
(IN MILLIONS)
 
Total loans before performance centers(2)................  $    1,245  $    1,483  $    1,423  $    1,385
Total assets.............................................       2,210       2,631       2,563       2,123
Total deposits before performance centers(2).............       1,080         959         980         864
FINANCIAL RATIOS.........................................
  Return on average assets...............................        0.95%       0.96%       0.96%       1.45%
  Efficiency ratio.......................................       65.80%      58.10%      59.10%      52.90%
</TABLE>
 
- ------------------------
 
(1) Performance center earnings represent the allocation of net interest income,
    noninterest income and noninterest expense between the business segments for
    products and services originated in one segment but managed by another.
 
(2) Represents loans and deposits for each business segment before allocation
    between the segments of loans and deposits originated in one segment but
    managed by another.
 
    The International Banking Group primarily provides correspondent banking and
trade finance-related products and services to financial institutions worldwide,
including Brazil, Hong Kong, Japan, Korea and Taiwan. It also serves selected
foreign firms and U.S. corporate clients in selected countries worldwide,
particularly in Asia. In the United States, International Banking serves
subsidiaries and affiliates of non-Japanese Asian companies and U.S. branches
and agencies of foreign banks. It also provides international services to
domestic corporate clients along the West Coast. For the nine months ended
September 30, 1998, average assets in this group were $2.1 billion and average
deposits were $864 million, in each case excluding inter-company placements and
overnight inter-bank loans, consisting primarily of export/import related
short-term trade transactions.
 
    This group has a long and stable history of providing correspondent and
trade-related services to international financial institutions. We believe that
we have achieved a leading market position and strong customer loyalty in the
Asian/Pacific correspondent banking market because we provide high quality,
customized products and services at competitive prices. The group maintains
branches in Tokyo, Taipei, Seoul and Hong Kong, representative offices in other
parts of Asia and Latin America, and an international banking subsidiary in New
York.
 
    One of International Banking's primary services is international trade
finance. Trade finance is typically short term, which means it generally has a
lower credit risk. Despite this relatively lower credit
 
                                      S-74
<PAGE>
risk compared to some other forms of commercial credit, we have reduced our
credit exposure and the average maturity of this portfolio in response to recent
instability in global markets.
 
    UNBC has substantially reduced its cross-border outstandings. We reduced
outstandings to Japan, Korea, Malaysia, Thailand, Vietnam, Singapore, Indonesia,
the Philippines, China and Hong Kong by $1 billion to $1.6 billion at September
30, 1998 compared to $2.6 billion at December 31, 1997. A substantial portion of
the outstandings are related to the International Banking Group. Management
continues to closely monitor its credit exposure in international markets.
 
    International Banking's strategy is to improve its global operations by
reducing costs and improving productivity. It competes with both U.S. and
foreign banks. Approximately 25 U.S. banks compete with the group to provide
correspondent banking and trade-related services to Asian banks. The group's
primary competitors include First Union, Bank of New York, Chase Manhattan,
Citibank, Bank of America, and Bank of Hawaii.
 
OTHER BUSINESS ACTIVITIES
 
    UNBC also conducts business activities with certain customers through other
organizational units of the bank.
 
    The Pacific Rim Corporate Group specializes in providing a range of credit,
deposit, and investment management products and services to companies in the
United States that are affiliated with companies headquartered outside the
United States, mostly in Japan. Average assets of this group for the nine months
ended September 1998 were $811 million.
 
    The Global Markets Group conducts business activities primarily to support
the previously described business groups and their customers. This group offers
a broad range of risk management products, such as foreign exchange, interest
rate swaps, caps and floors. Additionally, it originates debt instruments for
bank eligible issuers, places debt securities, as well as the bank's own
liabilities, with institutional investors and trades debt instruments in the
secondary market. This group also manages the market-related risks of UNBC as
part of its responsibilities for asset/liability management. It is also
responsible for maintaining the bank's investment securities portfolio.
 
OPERATING STRATEGY
 
    We focus our strategy on the following:
 
    - CAPITALIZE ON STRONG POSITION IN CORE CALIFORNIA MARKET. We believe that
      one of our primary strategic strengths is our established position in the
      attractive California bank market. California is the largest state in the
      United States, with over 32 million residents and nearly $1 trillion in
      gross state product. Based on both total assets and total deposits in
      California, we are the third largest commercial bank in California, and we
      are among the oldest banks on the West Coast. We serve approximately one
      million households and small businesses, with 244 full-service branches in
      California.
 
    - STRENGTHEN CONSUMER BANKING FRANCHISE. We offer a distinctive combination
      of traditional community bank service with a large branch network and a
      broad array of products. We are seeking to increase the number of consumer
      households we serve, and we are simultaneously broadening the range of
      financial products and services we provide to existing customers. We are
      also adding to the number of households we serve by offering product and
      service delivery alternatives, including online banking, video kiosks and
      telephone-based services. We are also obtaining new customers with the
      successful use of targeted direct mail promotions. In an effort to offer
      our customers more loan and deposit products to meet their financial
      services needs, we have installed a new computer-driven sales system
      designed to foster cross-selling. The new system has been installed in 40
      of our branches, and we anticipate full implementation within 18 months.
      We are seeking to increase the
 
                                      S-75
<PAGE>
      efficiency of our consumer banking business by implementing pricing that
      encourages our custom-
     ers to use alternative delivery systems. We also plan to expand the
      franchise through new branch openings and the possible acquisition of
      community banks in targeted markets.
 
    - FOCUS COMMERCIAL BANKING EFFORTS ON SPECIFIC INDUSTRIES AND COMPANIES. We
      are targeting our commercial banking activities on industries and
      companies for which we can reasonably expect to be one of a customers'
      principal banks. Our emphasis is on relationship management and meeting a
      large part of our targeted customers' credit and depository needs. Our
      commercial banking activities include certain industry specialties, such
      as communications, media and energy. We have been successful in increasing
      our role as agent and/or underwriter in syndicated loans to these
      specialized industry customers. We intend to broaden our syndication
      efforts to include other markets we serve, such as real estate finance and
      middle market companies. We also operate in certain niche markets for
      providing depository and cash management services. These niche markets
      include title and escrow companies, financial institutions, retailers and
      bankruptcy trustees.
 
    - DIVERSIFY REVENUE SOURCES AND EXPAND FEE-BASED BUSINESS. We are seeking to
      diversify our revenue sources by expanding our fee-based businesses, with
      a particular emphasis on our trust and asset management businesses. We are
      working with The Bank of Tokyo-Mitsubishi to distribute our proprietary
      HighMark mutual funds offshore and to serve as a sub-advisor for funds
      managed by them in Japan. We intend to expand the activities of our
      brokerage and insurance businesses by further penetrating our existing
      client base. We expanded our private banking business in 1998 to include
      15 offices, and we intend to expand our third-party distribution network,
      which provides 401(k) valuation and record-keeping services, to insurance
      companies, investment managers, brokers and mutual funds. Our non-interest
      income, net of gain on the sale of our credit card portfolio, has
      increased from 26% of total revenue in 1995 to 28% of total revenue for
      the nine-month period ended September 30, 1998. For the nine-month period
      ended September 30, 1997 to the nine-month period ended September 30,
      1998, non-interest income, net of gain on the sale of our credit card
      portfolio, increased from $342.6 million to $389.9 million.
 
    - EMPHASIZE QUALITY CUSTOMER SERVICE. We seek to continue to provide highly
      responsive customer service to create and maintain long-term relationships
      with clients who are often underserved by larger banks. We intend to
      continue to capitalize on the high quality of our customer service, taking
      advantage of any changes in service levels caused by recent increases in
      bank merger activity in the California market.
 
    - MAINTAIN HIGH LENDING STANDARDS AND STRONG ASSET QUALITY PROFILE. We
      strive to maintain strong asset quality through our underwriting
      standards, credit policies and ongoing credit reviews of our existing loan
      portfolio. These criteria, along with the recent strength of the
      California economy, have resulted in our current high quality portfolio.
      At September 30, 1998, our ratio of non-performing assets to total assets
      was 0.26%, or the seventh lowest of the 30 largest commercial banks in the
      United States. In addition, as of September 30, 1998, our ratio of
      reserves to total loans was 2.02%, or the eighth highest of the 30 largest
      commercial banks in the United States. At September 30, 1998, no industry
      concentration exceeded 10% of our total commercial, financial and
      industrial loans. Additionally, at September 30, 1998, we had a limited
      number of borrowers with larger loans. We had only 10 borrowers with total
      outstanding balances of over $50 million, and only one borrower with a
      total outstanding balance of over $75 million.
 
    - IDENTIFY STRATEGIC BUSINESSES AND CONSIDER POTENTIAL ACQUISITIONS OR
      DIVESTITURES. We view selective acquisitions and divestitures, as well as
      internal growth, as the primary means to increase and enhance our core
      businesses. We will consider acquisitions of banks and other financial
      service businesses that will increase our presence in existing markets or
      allow us to expand into contiguous markets. We will also consider
      acquisitions in other complementary financial service businesses in which
      we believe there exists superior growth potential. In addition, we will
      consider exiting
 
                                      S-76
<PAGE>
      businesses that do not meet our core business criteria. Our strategic
      business evaluation process focuses on historical financial performance,
      the competitive environment, future growth potential and regulatory
      considerations.
 
    - IMPROVE OPERATING EFFICIENCY.
 
    - ATTAIN NEW FINANCIAL PERFORMANCE TARGETS.
 
                                      S-77
<PAGE>
                              ACCOUNTING TREATMENT
 
    For financial reporting purposes, Finance Trust I will be treated as a
subsidiary of UNBC, and, accordingly, the accounts of Finance Trust I will be
included in the consolidated financial statements of UNBC. The Capital
Securities will be included in the consolidated balance sheets of UNBC, and
appropriate disclosures about the Capital Securities, the Guarantee and the
Junior Subordinated Debentures will be included in the notes to UNBC's
consolidated financial statements. For financial reporting purposes,
distributions on the Capital Securities will be recorded in the consolidated
statements of income of UNBC.
 
                     DESCRIPTION OF THE CAPITAL SECURITIES
 
    THE FOLLOWING DESCRIPTION OF THE CAPITAL SECURITIES IS NOT COMPLETE. YOU
SHOULD ALSO READ THE TRUST DECLARATION, THE BUSINESS TRUST ACT AND THE TRUST
INDENTURE ACT. WE WILL FILE THE TRUST DECLARATION AS AN EXHIBIT TO THE
REGISTRATION STATEMENT OF WHICH THE ACCOMPANYING PROSPECTUS FORMS A PART.
 
    The Capital Securities will be issued pursuant to the terms of the Trust
Declaration. It is expected that at the time the Shelf Registration Statement
becomes effective, the Trust Declaration will be qualified as an indenture under
the Trust Indenture Act, and The First National Bank of Chicago, as the Property
Trustee, will act as the indenture trustee for purposes of compliance with the
provisions of the Trust Indenture Act. The terms of the Capital Securities will
include those stated in the Trust Declaration and the Business Trust Act and
those made part of the Trust Declaration by the Trust Indenture Act.
 
GENERAL
 
    The Capital Securities will be limited to $  -  aggregate liquidation amount
at any one time outstanding. The Capital Securities will rank PARI PASSU with,
and payments will be made thereon PRO RATA with, the Common Securities, except
as described under "--Subordination of Common Securities." The Trust Declaration
does not permit the issuance by Finance Trust I of any securities other than the
Trust Securities or the incurrence by it of any indebtedness. The Junior
Subordinated Debentures will be registered in the name of Finance Trust I and
held by the Property Trustee in trust for the benefit of the holders of the
Capital Securities and the Common Securities. The Guarantee will be a guarantee
on a subordinated basis with respect to the Capital Securities but will not
guarantee payment of distributions or amounts payable on redemption or
liquidation of the Capital Securities when Finance Trust I does not have funds
on hand available to make such payments. In such an event, the remedy of a
holder of the Capital Securities is to direct the Property Trustee to enforce
the Property Trustee's rights under the Trust Declaration or the Junior
Subordinated Debentures and, if the Property Trustee fails to enforce such
rights, to institute a proceeding directly against UNBC. See "--Voting Rights"
and "Description of the Guarantee" below.
 
DISTRIBUTIONS
 
    Distributions on the Capital Securities will be fixed at a rate per annum of
  % of the stated liquidation amount of $25 per Capital Security. Distributions
to which holders of the Capital Securities are entitled and which are in arrears
for more than one quarter will accumulate additional distributions at the rate
per annum of   % thereof, compounded quarterly. The term "Distribution" includes
any such additional distributions payable unless otherwise stated. The amount of
Distributions payable for any period will be computed on the basis of a 360-day
year of twelve 30-day months, and, for any period other than a full quarter, on
the basis of the actual number of days elapsed per 30-day month.
 
    Distributions on the Capital Securities will be cumulative, will accumulate
from       , 1999, the date of initial issuance thereof, and will be payable
quarterly in arrears on       ,       ,       and       of each year, commencing
      , 1999, when, as and if available and determined to be so payable by the
Property Trustee, except as otherwise described below.
 
                                      S-78
<PAGE>
    Distributions on the Capital Securities will be payable to the holders
thereof as they appear on the books and records of Finance Trust I on the
relevant record dates, which, as long as the Capital Securities remain in
book-entry only form, will be one Business Day prior to the relevant payment
dates. Such Distributions will be paid through the Property Trustee, which will
hold amounts received in respect of the Junior Subordinated Debentures in the
Property Account for the benefit of the holders of the Trust Securities. Subject
to any applicable laws and regulations and the provisions of the Trust
Declaration, each such payment will be made as described under "--Book-Entry
Only Issuance--The Depository Trust Company" below. In the event that the
Capital Securities do not continue to remain in book-entry only form, the record
dates shall be 15 calendar days (whether or not a Business Day) prior to the
relevant payment dates. In the event that any date on which Distributions are to
be made on the Capital Securities is not a Business Day, then payment of the
Distributions payable on such date will be made on the next succeeding day which
is a Business Day (and without any interest or other payment in respect of any
such delay), except that, if such Business Day is in the next calendar year,
such payment shall be made on the immediately preceding Business Day, in each
case with the same force and effect as if made on such payment date. A "Business
Day" shall mean any day other than Saturday, Sunday, any other day on which
banking institutions in the City of New York (in the State of New York) are
permitted or required by any applicable law to close or a day on which the
corporate trust office of the Property Trustee or the Indenture Trustee is
closed for business.
 
    As long as UNBC is not in default on the payment of interest on the Junior
Subordinated Debentures, UNBC has the right to defer payments of interest on the
Junior Subordinated Debentures from time to time by extending the interest
payment period on the Junior Subordinated Debentures for a period (an "Extension
Period") not exceeding 20 consecutive quarters with respect to each Extension
Period; PROVIDED that no Extension Period may extend beyond the maturity of the
Junior Subordinated Debentures. As a consequence of any such deferral, quarterly
Distributions on the Capital Securities by Finance Trust I will be deferred, but
will continue to accumulate with interest thereon (to the extent permitted by
applicable law), at the rate of   -  % per annum, compounded quarterly, during
any such Extension Period. In the event that UNBC exercises this right, then
during such Extension Period:
 
    - UNBC may not declare or pay dividends on, make distributions with respect
      to, redeem, purchase or acquire, or make a liquidation payment with
      respect to, any of its capital stock; and
 
    - UNBC may not make any payment of interest, principal or premium, if any,
      on or repay, repurchase or redeem any debt securities issued by UNBC
      (including other junior subordinated deferrable debentures) that rank PARI
      PASSU with or junior in interest to the Junior Subordinated Debentures or
      make any guarantee payments with respect to the foregoing;
 
PROVIDED, HOWEVER, that, the foregoing restrictions do not apply to:
 
    - repurchases, redemptions or other acquisitions of shares of capital stock
      of UNBC in connection with (1) any employment contract, benefit plan or
      other similar arrangement with or for the benefit of any one or more
      employees, officers, directors or consultants, (2) a dividend reinvestment
      or shareholder stock purchase plan or (3) the issuance of capital stock of
      UNBC (or securities convertible into or exercisable for such capital
      stock) as consideration in an acquisition transaction entered into prior
      to such Extension Period;
 
    - an exchange, redemption or conversion of any class or series of UNBC's
      capital stock (or any capital stock of a subsidiary of UNBC) for any class
      or series of UNBC's capital stock or of any class or series of UNBC's
      indebtedness for any class or series of UNBC's capital stock;
 
    - the purchase of fractional interests in shares of UNBC's capital stock
      pursuant to the conversion or exchange provisions of such capital stock or
      the security being converted or exchanged;
 
                                      S-79
<PAGE>
    - any declaration of a dividend in connection with any shareholder's rights
      plan, or the issuance of rights, stock or other property under any
      shareholder's rights plan, or the redemption or repurchase of rights
      pursuant thereto;
 
    - any dividend in the form of stock, warrants, options or other rights where
      the dividend stock or the stock issuable upon exercise of such warrants,
      options or other rights is the same stock as that on which the dividend is
      being paid or ranks PARI PASSU with or junior to such stock; or
 
    - payments by UNBC under the Guarantee or under any similar guarantee by
      UNBC with respect to any trust common or trust preferred securities of its
      subsidiaries.
 
    Prior to the termination of any Extension Period, UNBC may further defer the
payment of interest; PROVIDED that the Extension Period, together with all such
previous and further extensions thereof, may not exceed 20 consecutive quarters
or extend beyond the maturity of the Junior Subordinated Debentures. Upon the
termination of any Extension Period and the payment of all amounts then due,
UNBC may select a new Extension Period, subject to the above requirements. See
"Description of the Junior Subordinated Debentures--Interest" and "--Option to
Extend Interest Payment Period" below. If Distributions are deferred, the
deferred Distributions, including accumulated additional Distributions thereon,
shall be paid to holders of record of the Capital Securities as they appear on
the books and records of Finance Trust I on the record date following the
termination of such Extension Period. UNBC has no current intention of
exercising its right to defer payments of interest by extending the interest
payment period on the Junior Subordinated Debentures.
 
    Finance Trust I's funds available for distribution to the holders of the
Capital Securities will be limited to payments received from UNBC on the Junior
Subordinated Debentures. See "Description of the Junior Subordinated Debentures"
below. The payment of Distributions out of moneys held by Finance Trust I is
guaranteed by UNBC to the extent set forth under "Description of the Guarantee"
below.
 
REDEMPTION
 
    Upon the repayment or redemption, in whole or in part, of the Junior
Subordinated Debentures, whether at maturity or upon earlier redemption as
provided in the Indenture, the proceeds from such repayment or redemption shall
be applied by the Property Trustee to redeem a Like Amount (as defined below) of
the Trust Securities at a redemption price (the "Redemption Price") equal to
100% of the aggregate Liquidation Amount (as defined below) of such Trust
Securities, plus accumulated and unpaid Distributions thereon to the date of
redemption (the "Redemption Date"). See "--Redemption Procedures." If less than
all the Junior Subordinated Debentures are to be repaid or redeemed on a
Redemption Date, then the proceeds from such repayment or redemption shall be
allocated to the redemption PRO RATA of the Trust Securities. UNBC will have the
right, subject to receipt of prior approval by the Federal Reserve if such
approval is then required under applicable capital guidelines or policies, to
redeem the Junior Subordinated Debentures (1) on or after            , 2004, in
whole at any time or in part from time to time or (2) prior to            , 2004
in whole (but not in part) at any time within 90 days following the occurrence
and continuation of a Tax Event, an Investment Company Event or a Regulatory
Capital Event (each as defined below). See "Description of the Junior
Subordinated Debentures-- Optional Redemption" below. A redemption of the Junior
Subordinated Debentures would cause a mandatory redemption of the Trust
Securities.
 
    "Like Amount" means (1) with respect to a redemption of Trust Securities,
Trust Securities having an aggregate Liquidation Amount equal to that portion of
the principal amount of Junior Subordinated Debentures to be contemporaneously
redeemed in accordance with the Indenture, allocated to the Common Securities
and to the Capital Securities based upon the relative Liquidation Amounts of
such classes and (2) with respect to a distribution of Junior Subordinated
Debentures to holders of Trust Securities in connection with a dissolution or
liquidation of Finance Trust I, Junior Subordinated Debentures having an
aggregate principal amount equal to the aggregate Liquidation Amount of the
Trust
 
                                      S-80
<PAGE>
Securities of the holder to whom such Junior Subordinated Debentures are
distributed. "Liquidation Amount" means the stated amount of $25 per Trust
Security.
 
    "Tax Event" means that the Regular Trustees (or, if Finance Trust I has been
dissolved at such time, an appropriate representative of the holders of the
Junior Subordinated Debentures) shall have received an opinion of nationally
recognized independent tax counsel experienced in such matters to the effect
that on or after         ,     , as a result of
 
    - any amendment to, clarification of, or change (including any announced
      prospective change) in the laws (or any regulations thereunder) of the
      United States or any political subdivision or taxing authority thereof or
      therein affecting taxation;
 
    - any judicial decision, official administrative pronouncement, ruling,
      regulatory procedure, notice or announcement, including any notice or
      announcement of intent to adopt such procedures or regulations (an
      "Administrative Action"); or
 
    - any amendment to, clarification of, or change in the official position or
      the interpretation of such Administrative Action or judicial decision that
      differs from the theretofore generally accepted position,
 
in each case, by any legislative body, court, governmental authority or
regulatory body, irrespective of the manner in which such amendment,
clarification, change or Administrative Action is made known, which amendment,
clarification, change or Administrative Action is effective or such
pronounce-ment or decision is announced, in each case, on or after         ,
    , there is more than an insubstantial risk that (1) Finance Trust I is, or
will be within 90 days of the date thereof, subject to United States federal
income tax with respect to income accrued or received on the Junior Subordinated
Debentures, (2) Finance Trust I is, or will be within 90 days of the date
thereof, subject to more than a DE MINIMIS amount of taxes (other than
withholding taxes), duties or other governmental charges or (3) interest paid in
cash by UNBC to Finance Trust I on the Junior Subordinated Debentures is not, or
within 90 days of the date thereof will not be, deductible, in whole or in part,
by UNBC for United States federal income tax purposes. Notwithstanding the
foregoing, a Tax Event shall not include any change in tax law that requires
UNBC to defer taking a deduction for any original issue discount ("OID") that
accrues with respect to the Junior Subordinated Debentures until the interest
payment related to such OID is paid by UNBC in cash; PROVIDED THAT such change
in tax law does not create more than an insubstantial risk that UNBC will be
prevented from taking a deduction for OID accruing with respect to the Junior
Subordinated Debentures at a date that is no later than the date the interest
payment related to such OID is actually paid by UNBC in cash. If an event
described in clause (1) or (2) of the definition of "Tax Event" above has
occurred and is continuing and Finance Trust I is the holder of all the Junior
Subordinated Debentures, UNBC will pay Additional Interest (as defined in
"Description of the Junior Subordinated Debentures" below), if any, on the
Junior Subordinated Debentures.
 
    "Investment Company Event" means that the Regular Trustees shall have
received an opinion of nationally recognized independent counsel to UNBC
experienced in such matters to the effect that, as a result of the occurrence of
a change in law or regulation or a written change in interpretation or
application of law or regulation by any legislative body, court, governmental
agency or regulatory authority on or after the date of this prospectus
supplement, there is more than an insubstantial risk that Finance Trust I is or
will be considered an "investment company" that is required to be registered
under the Investment Company Act of 1940.
 
    "Regulatory Capital Event" means that UNBC shall have received an opinion of
nationally recognized independent counsel experienced in such matters that, as a
result of (1) any amendment to, clarification of or change in applicable laws or
regulations or official interpretations thereof or policies with respect thereto
or (2) any official administrative pronouncement or judicial decision
interpreting or applying such laws or regulations, which amendment,
clarification, change, pronouncement or decision is
 
                                      S-81
<PAGE>
announced or is effective after the date of this prospectus supplement, there is
more than an insubstantial risk that the Capital Securities will no longer
constitute Tier 1 capital of UNBC for purposes of the capital adequacy
guidelines or policies of the Federal Reserve or its successor as UNBC's primary
federal banking regulator.
 
REDEMPTION PROCEDURES
 
    Finance Trust I may not redeem fewer than all of the outstanding Capital
Securities unless all accumulated and unpaid Distributions have been paid on all
Capital Securities for all quarterly distribution periods terminating on or
prior to the Redemption Date.
 
    Capital Securities redeemed on each Redemption Date shall be redeemed at the
Redemption Price with the applicable proceeds from the contemporaneous
redemption of Junior Subordinated Debentures. Redemptions of the Capital
Securities shall be made, and the Redemption Price shall be payable, on each
Redemption Date only to the extent that Finance Trust I has funds then on hand
and legally available for the payment of such Redemption Price. See also
"--Subordination of Common Securities." Notice of redemption of the Trust
Securities shall be given not less than 30 or more than 60 days prior to the
date fixed for redemption. If Finance Trust I gives a notice of redemption in
respect of the Capital Securities, then, by 12:00 noon, New York City time, on
the Redemption Date, to the extent funds are available, in the case of Capital
Securities held in book-entry form, the Property Trustee will deposit
irrevocably with The Depository Trust Company ("DTC") funds sufficient to pay
the applicable Redemption Price and will give DTC irrevocable instructions and
authority to pay the Redemption Price to the holders of the Capital Securities.
With respect to Capital Securities not held in book-entry form, the Property
Trustee to the extent funds are available, will irrevocably deposit with the
paying agent for the Capital Securities funds sufficient to pay the applicable
Redemption Price and will give such paying agent irrevocable instructions and
authority to pay the Redemption Price to the holders thereof upon surrender of
their certificates evidencing the Capital Securities. Notwithstanding the
foregoing, Distributions payable on or prior to the Redemption Date for any
Capital Securities called for redemption shall be payable to the holders of the
Capital Securities on the relevant record dates.
 
    If notice of redemption shall have been given and funds deposited as
required, then upon the date of such deposit all rights of the holders of such
Capital Securities so called for redemption will cease, except the right of the
holders of such Capital Securities to receive the Redemption Price, but without
interest on such Redemption Price, and such Capital Securities will cease to be
outstanding. If any date fixed for redemption of Capital Securities is not a
Business Day, then payment of the Redemption Price payable on such date will be
made on the next succeeding day which is a Business Day (without any interest or
other payment in respect of any such delay), except that, if such Business Day
falls in the next calendar year, such payment will be made on the immediately
preceding Business Day, in each case with the same force and effect as if made
on the date such payment was originally payable. In the event that payment of
the Redemption Price in respect of Capital Securities called for redemption is
improperly withheld or refused and not paid either by Finance Trust I or by UNBC
pursuant to the Guarantee, Distributions on such Capital Securities will
continue to accumulate at the then applicable rate, from the Redemption Date
originally established by Finance Trust I for such Capital Securities to the
date such Redemption Price is actually paid, in which case the actual payment
date will be the date fixed for redemption for purposes of calculating the
Redemption Price.
 
    Subject to applicable law (including, without limitation, United States
federal securities laws), UNBC or its affiliates may at any time and from time
to time purchase outstanding Capital Securities, by tender, in the open market
or by private agreement, and may resell such securities.
 
    If less than all the Capital Securities and Common Securities are to be
redeemed on a Redemption Date, then the aggregate Liquidation Amount of such
Capital Securities and Common Securities to be redeemed shall be allocated PRO
RATA to the Capital Securities and the Common Securities based upon the
 
                                      S-82
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relative Liquidation Amounts of such classes. The particular Capital Securities
to be redeemed shall be selected on a PRO RATA basis not more than 60 days prior
to the Redemption Date from the outstanding Capital Securities not previously
called for redemption, by such method as the Property Trustee shall deem fair
and appropriate, or if the Capital Securities are then held in book-entry form,
in accordance with DTC's customary procedures. The Property Trustee shall
promptly notify the securities registrar for the Trust Securities in writing of
the Capital Securities selected for redemption. For all purposes of the Trust
Declaration, unless the context otherwise requires, all provisions relating to
the redemption of Capital Securities shall relate, in the case of any Capital
Securities redeemed or to be redeemed only in part, to the portion of the
aggregate Liquidation Amount of Capital Securities which has been or is to be
redeemed. Notice of any redemption of the Trust Securities will be mailed at
least 30 days but not more than 60 days before the Redemption Date to each
registered holder of Capital Securities to be redeemed at its address appearing
on the securities register for the Trust Securities. Unless UNBC defaults in
payment of the Redemption Price on the Junior Subordinated Debentures, on and
after the Redemption Date interest will cease to accrue on the Junior
Subordinated Debentures or portions thereof called for redemption and, unless
payment of the Redemption Price in respect of the Capital Securities is withheld
or refused and not paid either by Finance Trust I or UNBC pursuant to the
Guarantee, Distributions will cease to accumulate on the Capital Securities or
portions thereof called for redemption.
 
SUBORDINATION OF COMMON SECURITIES
 
    Payment of Distributions on, and the Redemption Price of, the Capital
Securities and Common Securities, as applicable, will be made PRO RATA based on
the Liquidation Amount of such Capital Securities and Common Securities.
However, if on any date on which a Distribution is to be made, or any Redemption
Date, an event of default under the Indenture (an "Indenture Event of Default")
has occurred and is continuing, no payment of any Distribution on, or Redemption
Price of, any of the Common Securities, and no other payment on account of the
redemption, liquidation or other acquisition of such Common Securities, shall be
made unless payment in full in cash of all accumulated and unpaid Distributions
on all the outstanding Capital Securities for all Distribution periods
terminating on or prior thereto, or in the case of payment of the Redemption
Price the full amount of such Redemption Price on all the outstanding Capital
Securities then called for redemption, shall have been made or provided for, and
all funds available to the Property Trustee shall first be applied to the
payment in full in cash of all Distributions on, or the Redemption Price of, the
Capital Securities then due and payable. In the case of any event of default
under the Trust Declaration (a "Declaration Event of Default") resulting from an
Indenture Event of Default, the holders of the Common Securities will be deemed
to have waived any right to act with respect to any such Declaration Event of
Default until the effects of all Declaration Events of Default with respect to
such Capital Securities have been cured, waived or otherwise eliminated. See "--
Declaration Events of Default" and "Description of the Junior Subordinated
Debentures--Indenture Events of Default" below. Until all Declaration Events of
Default with respect to the Capital Securities have been so cured, waived or
otherwise eliminated, the Property Trustee will act solely on behalf of the
holders of the Capital Securities and not on behalf of the holders of the Common
Securities, and only the holders of the Capital Securities will have the right
to direct the Property Trustee to act on their behalf.
 
LIQUIDATION DISTRIBUTION UPON DISSOLUTION
 
    The amount payable on the Capital Securities in the event of any liquidation
of Finance Trust I is $25 per Capital Security, which may, subject to certain
exceptions, be in the form of a distribution of such amount in Junior
Subordinated Debentures, plus accumulated and unpaid Distributions. The holders
of all the outstanding Common Securities have the right at any time to dissolve
Finance Trust I and, after satisfaction of liabilities to creditors of Finance
Trust I as provided by applicable law, to cause the Junior Subordinated
Debentures to be distributed to the holders of the Capital Securities and Common
Securities in liquidation of Finance Trust I. Pursuant to the Trust Declaration,
Finance Trust I will automatically dissolve upon expiration of its term on     ,
or, if earlier, on the first to occur of:
 
                                      S-83
<PAGE>
    (1) certain events of bankruptcy, dissolution or liquidation of UNBC or the
holder of the Common Securities;
 
    (2) the distribution of a Like Amount of the Junior Subordinated Debentures
to the holders of the Trust Securities, if the holders of Common Securities have
given written direction to the Property Trustee to dissolve Finance Trust I
(which direction, subject to the foregoing restrictions, is optional and wholly
within the discretion of the holders of Common Securities);
 
    (3) the repayment of all the Capital Securities in connection with the
redemption of all the Trust Securities as described under "--Redemption"; and
 
    (4) the entry of an order for the dissolution of Finance Trust I by a court
of competent jurisdiction.
 
If dissolution of Finance Trust I occurs as described in clause (1), (2) or (4)
above, Finance Trust I will be liquidated by the Property Trustee as
expeditiously as the Property Trustee determines to be possible by distributing,
after satisfaction of liabilities to creditors of Finance Trust I as provided by
applicable law, to the holders of such Trust Securities a Like Amount of the
Junior Subordinated Debentures, unless such distribution is not practical, in
which event such holders will be entitled to receive out of the assets of
Finance Trust I available for distribution to holders, after satisfaction of
liabilities to creditors of Finance Trust I as provided by applicable law, an
amount equal to, in the case of holders of Capital Securities, the aggregate of
the Liquidation Amount plus accumulated and unpaid Distributions thereon to the
date of payment (such amount being the "Liquidation Distribution"). If such
Liquidation Distribution can be paid only in part because Finance Trust I has
insufficient assets available to pay in full the aggregate Liquidation
Distribution, then the amounts payable directly by Finance Trust I on its
Capital Securities shall be paid on a PRO RATA basis. The holders of the Common
Securities will be entitled to receive distributions upon any such liquidation
PRO RATA with the holders of the Capital Securities, except that if an Indenture
Event of Default has occurred and is continuing, the Capital Securities shall
have a priority over the Common Securities. See "--Subordination of Common
Securities."
 
    After the liquidation date is fixed for any distribution of Junior
Subordinated Debentures:
 
    - the Capital Securities will no longer be deemed to be outstanding;
 
    - DTC or its nominee, as the registered holder of the Capital Securities,
      will receive a registered global certificate or certificates representing
      the Junior Subordinated Debentures to be delivered upon such distribution
      with respect to Capital Securities held by DTC or its nominee and
 
    - any certificates representing the Capital Securities not held by DTC or
      its nominee will be deemed to represent the Junior Subordinated Debentures
      having a principal amount equal to the stated Liquidation Amount of the
      Capital Securities and bearing accrued and unpaid interest in an amount
      equal to the accumulated and unpaid Distributions on the Capital
      Securities until such certificates are presented to the security registrar
      for the Preferred Securities for transfer or reissuance.
 
    If UNBC does not redeem the Junior Subordinated Debentures prior to maturity
and Finance Trust I is not liquidated and the Junior Subordinated Debentures are
not distributed to holders of the Capital Securities, the Capital Securities
will remain outstanding until the repayment of the Junior Subordinated
Debentures and the distribution of the Liquidation Distribution to the holders
of the Capital Securities. There can be no assurance as to the market prices for
the Capital Securities or the Junior Subordinated Debentures that may be
distributed in exchange for Capital Securities if a dissolution and liquidation
of Finance Trust I were to occur. Accordingly, the Capital Securities that an
investor may purchase, or the Junior Subordinated Debentures that the investor
may receive on dissolution and liquidation of Finance Trust I, may trade at a
discount to the price that the investor paid to purchase the Capital Securities
offered hereby.
 
                                      S-84
<PAGE>
DECLARATION EVENTS OF DEFAULT
 
    An Indenture Event of Default constitutes a Declaration Event of Default;
PROVIDED that, pursuant to the Trust Declaration, the holder of the Common
Securities will be deemed to have waived any Declaration Event of Default with
respect to the Common Securities until all Declaration Events of Default with
respect to the Capital Securities have been cured, waived or otherwise
eliminated. Until all Declaration Events of Default with respect to the Capital
Securities have been so cured, waived or otherwise eliminated, the Property
Trustee will be deemed to be acting solely on behalf of the holders of the
Capital Securities, and only the holders of the Capital Securities will have the
right to direct the Property Trustee with respect to certain matters under the
Trust Declaration and, therefore, the Indenture.
 
    Upon the occurrence of a Declaration Event of Default, the Property Trustee
as the sole holder of the Junior Subordinated Debentures will have the right
under the Indenture to declare the principal of and interest on the Junior
Subordinated Debentures to be immediately due and payable. UNBC and Finance
Trust I are each required to file annually with the Property Trustee an
officer's certificate as to its compliance with all conditions and covenants
under the Trust Declaration.
 
VOTING RIGHTS
 
    Except as described in this section, under the Business Trust Act and the
Trust Indenture Act, under "Description of the Guarantee--Modification of the
Guarantee; Assignment" below and as otherwise required by law and the Trust
Declaration, the holders of the Capital Securities will have no voting rights.
 
    Subject to the requirement that the Property Trustee obtain a tax opinion in
certain circumstances set forth in the last sentence of the next paragraph, the
holders of a majority in aggregate Liquidation Amount of the Capital Securities
have the right to:
 
    (1) direct the time, method and place of conducting any proceeding for any
remedy available to the Property Trustee, or direct the exercise of any trust or
power conferred upon the Property Trustee under the Trust Declaration, including
the right to direct the Property Trustee, as holder of the Junior Subordinated
Debentures, to exercise the remedies available under the Indenture with respect
to the Junior Subordinated Debentures;
 
    (2) waive any past Indenture Event of Default that is waivable under the
Indenture;
 
    (3) exercise any right to rescind or annul a declaration that the principal
of all the Junior Subordinated Debentures shall be due and payable; or
 
    (4) consent to any amendment, modification or termination of the Indenture
or the Junior Subordinated Debentures where such consent shall be required;
 
PROVIDED, HOWEVER, that if an Indenture Event of Default has occurred and is
continuing, the holders of 25% of the aggregate liquidation amount of the
Capital Securities then outstanding may direct the Property Trustee to declare
the principal of and interest on the Junior Subordinated Debentures immediately
due and payable; PROVIDED, FURTHER, that, where a consent or action under the
Indenture would require the consent or action of holders of more than a majority
in principal amount of the Junior Subordinated Debentures then outstanding (a
"Super-Majority") affected thereby, only the holders of at least such
Super-Majority in aggregate liquidation amount of the Capital Securities then
outstanding may direct the Property Trustee to give such consent or take such
action. If the Property Trustee fails to enforce its rights under the Junior
Subordinated Debentures, any holder of Capital Securities may institute a legal
proceeding against UNBC to enforce the Property Trustee's rights under the
Junior Subordinated Debentures. Notwithstanding the foregoing, if a Declaration
Event of Default has occurred and is continuing and such event is attributable
to the failure of UNBC to pay interest or principal on the Junior Subordinated
Debentures on the date such interest or principal is otherwise payable (or in
the case of redemption, the Redemption Date), then a holder of Capital
Securities may directly institute a proceeding
 
                                      S-85
<PAGE>
for enforcement of payment to such holder of the principal of or interest on the
Junior Subordinated Debentures having a principal amount equal to the aggregate
Liquidation Amount of the Capital Securities of such holder (a "Direct Action")
on or after the respective due dates specified in the Junior Subordinated
Debentures. In connection with such Direct Action, the rights of UNBC, as the
holder of the Common Securities, will be subrogated to the rights of such
holders of Capital Securities under the Declaration to the extent of any payment
made by UNBC, as the issuer of the Junior Subordinated Debentures, to such
holder of Capital Securities in such Direct Action that otherwise would have
been made to the holders of the Common Securities if the Common Securities had
not been subordinated to the Capital Securities in such event. The holders of
the Capital Securities will not be able to exercise directly any other remedy
available to the holders of the Junior Subordinated Debentures.
 
    The Property Trustee shall notify all holders of the Capital Securities of
any notice of default received from the Indenture Trustee with respect to the
Junior Subordinated Debentures. Such notice shall state that such Indenture
Event of Default also constitutes a Declaration Event of Default. Except with
respect to directing the time, method and place of conducting a proceeding for a
remedy, the Property Trustee shall not take any of the actions described in
clauses (1), (2), (3) or (4) in the first sentence of the preceding paragraph
unless the Property Trustee has obtained an opinion of counsel from a nationally
recognized independent law firm experienced in such matters to the effect that,
as a result of such action, Finance Trust I will not fail to be classified as a
grantor trust for United States federal income tax purposes.
 
    In the event the consent of the Property Trustee, as the holder of the
Junior Subordinated Debentures, is required under the Indenture with respect to
any amendment, modification or termination of the Indenture or the Junior
Subordinated Debentures, the Property Trustee shall request the direction of the
holders of the Trust Securities with respect to such amendment, modification or
termination and shall vote with respect to such amendment, modification or
termination as directed by a majority in Liquidation Amount of the Trust
Securities voting together as a single class; PROVIDED, HOWEVER, that where a
consent under the Indenture would require the consent of a Super-Majority, the
Property Trustee may only give such consent at the direction of holders of at
least the proportion in liquidation amount of the Trust Securities then
outstanding which the relevant Super-Majority represents of the aggregate
principal amount of the Junior Subordinated Debentures then outstanding. The
Property Trustee shall be under no obligation to take any such action in
accordance with the directions of the holders of the Trust Securities unless the
Property Trustee has obtained an opinion of counsel from a nationally recognized
independent law firm experienced in such matters to the effect that, as a result
of such action, Finance Trust I will not fail to be classified as a grantor
trust for United States federal income tax purposes.
 
    A waiver of an Indenture Event of Default will constitute a waiver of the
corresponding Declaration Event of Default.
 
    Any required approval or direction of holders of Capital Securities may be
given at a separate meeting of holders of Capital Securities convened for such
purpose, at a meeting of all of the holders of Trust Securities or pursuant to
written consent. The Regular Trustees will cause a notice of any meeting at
which holders of Capital Securities are entitled to vote, or of any matter upon
which action by written consent of such holders is to be taken, to be mailed to
each holder of record of Capital Securities. Each such notice will include a
statement setting forth the following information: (1) the date of such meeting
or the date by which such action is to be taken, (2) a description of any
resolution proposed for adoption at such meeting on which such holders are
entitled to vote or of such matter upon which written consent is sought and (3)
instructions for the delivery of proxies or consents. No vote or consent of the
holders of Capital Securities will be required for Finance Trust I to redeem and
cancel Capital Securities or distribute Junior Subordinated Debentures in
accordance with the Trust Declaration.
 
    Notwithstanding that holders of Capital Securities are entitled to vote or
consent under any of the circumstances described above, any of the Capital
Securities that are owned at such time by UNBC or any entity directly or
indirectly controlling or controlled by, or under direct or indirect common
control with,
 
                                      S-86
<PAGE>
UNBC shall not be entitled to vote or consent and shall, for purposes of such
vote or consent, be treated as if such Capital Securities were not outstanding.
 
    The procedures by which holders of Capital Securities may exercise their
voting rights are described under "--Book-Entry Only Issuance--The Depository
Trust Company" below.
 
    Holders of the Capital Securities will have no rights to appoint or remove
the Regular Trustees, who may be appointed, removed or replaced solely by UNBC
as the holder of all of the Common Securities.
 
MODIFICATION OF THE TRUST DECLARATION
 
    The Trust Declaration may be modified and amended if approved by a majority
of the Regular Trustees (and in certain circumstances the Property Trustee);
PROVIDED that, if any proposed amendment provides for, or the Regular Trustees
otherwise propose to effect, (1) any action that would adversely affect the
powers, preferences or special rights of the Trust Securities, whether by way of
amendment to the Trust Declaration or otherwise, or (2) the dissolution,
winding-up or termination of Finance Trust I other than pursuant to the terms of
the Trust Declaration, then the holders of the Trust Securities voting together
as a single class will be entitled to vote on such amendment or proposal and
such amendment or proposal shall not be effective except with the approval of at
least a majority in Liquidation Amount of the Trust Securities affected thereby;
PROVIDED that if any amendment or proposal referred to in clause (1) above would
adversely affect only the Capital Securities or the Common Securities, then only
the affected class will be entitled to vote on such amendment or proposal and
such amendment or proposal shall not be effective except with the approval of at
least a majority in Liquidation Amount of such class of Trust Securities.
 
    Notwithstanding the foregoing, no amendment or modification may be made to
the Trust Declaration if such amendment or modification would (1) cause Finance
Trust I to be classified for purposes of United States federal income taxation
as other than a grantor trust, (2) affect the powers, rights, duties,
obligations or immunities of the Property Trustee (unless such amendment is
consented to by the Property Trustee) or (3) cause Finance Trust I to be deemed
an "investment company" which is required to be registered under the Investment
Company Act of 1940.
 
MERGERS, CONSOLIDATIONS OR AMALGAMATIONS
 
    Finance Trust I may not consolidate, amalgamate or merge with or into, or be
replaced by, or convey, transfer or lease its properties and assets
substantially as an entirety to, any corporation or other body, except as
described below. Finance Trust I may, with the consent of a majority of the
Regular Trustees and without the consent of the holders of the Trust Securities
or the Property Trustee or the Delaware Trustee, consolidate, amalgamate or
merge with or into, or be replaced by, a trust organized as such under the laws
of any state; provided that:
 
    (1) such successor entity either
 
    - expressly assumes all of the obligations of Finance Trust I under the
      Trust Securities; or
 
    - substitutes for the Trust Securities other securities (the "Successor
      Securities"), so long as the Successor Securities rank the same as the
      Trust Securities with respect to distributions and payments upon
      liquidation, redemption and otherwise;
 
    (2) UNBC expressly acknowledges a trustee of such successor entity
possessing the same powers and duties as the Property Trustee, as the holder of
the Junior Subordinated Debentures;
 
    (3) the Capital Securities or any Successor Securities are listed, or any
Successor Securities will be listed upon notification of issuance, on any
national securities exchange or with another organization on which the Capital
Securities are then listed;
 
                                      S-87
<PAGE>
    (4) such merger, consolidation, amalgamation or replacement does not cause
the Capital Securities or any Successor Securities to be downgraded by any
nationally recognized statistical rating organization;
 
    (5) such merger, consolidation, amalgamation or replacement does not
adversely affect the rights, preferences and privileges of the holders of the
Trust Securities or any Successor Securities in any material respect under the
documents governing the Trust Securities or the Successor Securities (other than
with respect to any dilution of the holders' interest in the new entity);
 
    (6) such successor entity has a purpose substantially identical to that of
Finance Trust I;
 
    (7) prior to such merger, consolidation, amalgamation or replacement, UNBC
has received an opinion of a nationally recognized independent counsel to
Finance Trust I experienced in such matters to the effect that:
 
    - such merger, consolidation, amalgamation or replacement does not adversely
      affect the rights, preferences and privileges of the holders of the Trust
      Securities or any Successor Securities in any material respect under the
      documents governing the Trust Securities or the Successor Securities
      (other than with respect to any dilution of the holders' interest in the
      new entity); and
 
    - following such merger, consolidation, amalgamation or replacement, neither
      Finance Trust I nor such successor entity will be required to register as
      an investment company under the Investment Company Act of 1940; and
 
    (8) UNBC guarantees the obligations of such successor entity under the
Successor Securities at least to the extent provided by the Guarantee.
 
Notwithstanding the foregoing, Finance Trust I shall not, except with the
consent of holders of 100% in Liquidation Amount of the Trust Securities,
consolidate, amalgamate or merge with or into, or be replaced by, any other
entity or permit any other entity to consolidate, amalgamate or merge with or
into, or replace it, if such consolidation, amalgamation, merger or replacement
would cause Finance Trust I or the successor entity to be classified as other
than a grantor trust for United States federal income tax purposes.
 
    There are no provisions which afford the holders of the Capital Securities
protection in the event of a highly leveraged transaction, reorganization,
restructuring, merger or similar transaction involving UNBC. There are also no
provisions which require the repurchase of the Capital Securities upon a change
in control of UNBC.
 
BOOK-ENTRY ONLY ISSUANCE--THE DEPOSITORY TRUST COMPANY
 
    DTC will act as securities depositary for the Capital Securities. The
Capital Securities will be issued only as fully-registered securities registered
in the name of Cede & Co. (DTC's nominee). One or more fully registered global
Capital Securities certificates, representing the total aggregate number of
Capital Securities, will be issued and will be deposited with DTC or a custodian
appointed by DTC.
 
    DTC is a limited-purpose trust company organized under the New York Banking
Law, a "banking organization" within the meaning of the New York Banking Law, a
member of the Federal Reserve System, a "clearing corporation" within the
meaning of the New York Uniform Commercial Code, and a "clearing agency"
registered pursuant to the provisions of Section 17A of the Securities Exchange
Act of 1934. DTC holds securities that its participants deposit with DTC. DTC
also facilitates the settlement among participants of securities transactions,
such as transfers and pledges, in deposited securities through electronic
computerized book-entry changes in participants' accounts, thereby eliminating
the need for physical movement of securities certificates. Direct participants
include securities brokers and dealers, banks, trust companies, clearing
corporations and certain other organizations ("Direct Participants").
 
    DTC is owned by a number of its Direct Participants and by the New York
Stock Exchange, Inc., the American Stock Exchange, Inc., and the National
Association of Securities Dealers, Inc. Access to the
 
                                      S-88
<PAGE>
DTC system is also available to others, such as securities brokers and dealers,
banks and trust companies, that clear transactions through or maintain a direct
or indirect custodial relationship with a Direct Participant ("Indirect
Participants"). The rules applicable to DTC and its participants are on file
with the Securities and Exchange Commission.
 
    Purchases of Capital Securities within the DTC system must be made by or
through a Direct Participant, which will receive a credit for the Capital
Securities on DTC's records. The ownership interest of each actual purchaser of
a Capital Security (a "beneficial owner") will be recorded on the Direct and
Indirect Participants' records. Beneficial owners will not receive written
confirmation from DTC of their purchases, but beneficial owners are expected to
receive written confirmations providing details of the transactions, as well as
periodic statements of their holdings, from the Direct or Indirect Participants
through which the beneficial owners purchase Capital Securities. Transfers of
ownership interests in the Capital Securities will be accomplished by entries
made on the books of participants acting on behalf of beneficial owners.
Beneficial owners will not receive certificates representing their ownership
interests in the Capital Securities, except in the event that use of the
book-entry system for the Capital Securities is discontinued. The laws of some
states may require that certain purchasers of securities take physical delivery
of such securities in definitive form. Such laws may impair the ability to
transfer beneficial interests in the global certificate representing the Capital
Securities.
 
    To facilitate subsequent transfers, all the Capital Securities deposited by
participants with DTC will be registered in the name of DTC's nominee, Cede &
Co. The deposit of Capital Securities with DTC and their registration in the
name of Cede & Co. will effect no change in beneficial ownership. DTC will have
no knowledge of the actual beneficial owners of the Capital Securities. DTC's
records reflect only the identity of the Direct Participants to whose accounts
such Capital Securities will be credited, which may or may not be the beneficial
owners. The participants will remain responsible for keeping account of their
holdings on behalf of their customers.
 
    Conveyance of notices and other communications by DTC to Direct
Participants, by Direct Participants to Indirect Participants and by Direct
Participants and Indirect Participants to beneficial owners will be governed by
arrangements among them, subject to any statutory or regulatory requirements
that may be in effect from time to time.
 
    Redemption notices shall be sent to Cede & Co. If less than all of the
Capital Securities are being redeemed, DTC will reduce each Direct Participant's
holdings of Capital Securities in accordance with its procedures.
 
    Although voting with respect to the Capital Securities is limited, in those
cases where a vote is required, neither DTC nor Cede & Co. will itself consent
or vote with respect to Capital Securities. Under its usual procedures, DTC
would mail an omnibus proxy to Finance Trust I as soon as possible after the
record date. The omnibus proxy assigns Cede & Co.'s consenting or voting rights
to those Direct Participants to whose accounts the Capital Securities are
credited on the record date (identified in a listing attached to the omnibus
proxy). UNBC and Finance Trust I believe that the arrangements among DTC, Direct
and Indirect Participants, and beneficial owners will enable the beneficial
owners to exercise rights equivalent in substance to the rights that can be
directly exercised by a holder of a beneficial interest in Finance Trust I.
 
    Distribution payments on the Capital Securities will be made to DTC. DTC's
practice is to credit Direct Participants' accounts on the relevant payment date
in accordance with their respective holdings shown on DTC's records unless DTC
has reason to believe that it will not receive payments on such payment date.
Payments by participants to beneficial owners will be governed by standing
instructions and customary practices, as is the case with securities held for
the account of customers in bearer form or registered in "street name," and such
payments will be the responsibility of such participant and not of DTC, Finance
Trust I or UNBC, subject to any statutory or regulatory requirements to the
contrary that may be in effect from time to time. Payment of Distributions to
DTC is the responsibility of Finance Trust
 
                                      S-89
<PAGE>
I, disbursement of such payments to Direct Participants is the responsibility of
DTC, and disbursement of such payments to the beneficial owners is the
responsibility of Direct and Indirect Participants.
 
    Except as provided in "Description of the Junior Subordinated
Debentures--Discontinuance of the Depositary's Services" below, a beneficial
owner in a global Capital Security certificate will not be entitled to receive
physical delivery of Capital Securities. Accordingly, each beneficial owner must
rely on the procedures of DTC to exercise any rights under the Capital
Securities.
 
    DTC may discontinue providing its services as securities depositary with
respect to the Capital Securities at any time by giving reasonable notice to
Finance Trust I. Under such circumstances, in the event that a successor
securities depositary is not obtained, Capital Securities certificates are
required to be printed and delivered. Additionally, the Regular Trustees (with
the consent of UNBC) may decide to discontinue use of the system of book-entry
transfers through DTC (or any successor depositary) with respect to the Capital
Securities. In that event, certificates for the Capital Securities will be
printed and delivered.
 
    The information in this section concerning DTC and DTC's book-entry system
has been obtained from sources that UNBC and Finance Trust I believe to be
reliable, but neither UNBC nor Finance Trust I takes responsibility for the
accuracy thereof.
 
INFORMATION CONCERNING THE PROPERTY TRUSTEE
 
    The Property Trustee, other than during the occurrence of a default with
respect to the Trust Securities, undertakes to perform only such duties as are
specifically set forth in the Trust Declaration and, after such a default, shall
exercise the same degree of care as a prudent individual would exercise in the
conduct of his or her own affairs.
 
    Subject to such provisions, the Property Trustee is under no obligation to
exercise any of the powers vested in it by the Trust Declaration at the request
of any holder of Capital Securities, unless offered reasonable indemnity by such
holder against the costs, expenses and liabilities which might be incurred
thereby. The holders of Capital Securities will not be required to offer such
indemnity in the event such holders, by exercising their voting rights, direct
the Property Trustee to take any action following a Declaration Event of
Default.
 
PAYING AGENT
 
    In the event that the Capital Securities do not remain in book-entry only
form, the following provisions would apply:
 
    The Property Trustee will act as paying agent and may designate an
additional or substitute paying agent at any time.
 
    Registration of transfers of Capital Securities will be effected without
charge by or on behalf of Finance Trust I, but upon payment (with the giving of
such indemnity as Finance Trust I or UNBC may require) in respect of any tax or
other governmental charges that may be imposed in relation to it.
 
    Finance Trust I will not be required to register or cause to be registered
the transfer of Capital Securities after such Capital Securities have been
called for redemption.
 
GOVERNING LAW
 
    The Trust Declaration and the Capital Securities will be governed by, and
construed in accordance with, the internal laws of the State of Delaware.
 
                                      S-90
<PAGE>
MISCELLANEOUS
 
    The Regular Trustees are authorized and directed to operate Finance Trust I
in such a way so that Finance Trust I will not be (1) required to register as an
"investment company" under the Investment Company Act of 1940 or (2)
characterized as other than a grantor trust for United States federal income tax
purposes. UNBC is authorized and directed to conduct its affairs so that the
Junior Subordinated Debentures will be treated as indebtedness of UNBC for
United States federal income tax purposes. In this connection, UNBC and the
Regular Trustees are authorized to take any action, not inconsistent with
applicable law, the certificate of trust of Finance Trust I or the articles of
incorporation of UNBC, that each of UNBC and the Regular Trustees determines in
its discretion to be necessary or desirable to achieve such end, as long as such
action does not materially adversely affect the interests of the holders of the
Capital Securities.
 
    Holders of the Capital Securities have no preemptive rights.
 
                                      S-91
<PAGE>
               DESCRIPTION OF THE JUNIOR SUBORDINATED DEBENTURES
 
    THE FOLLOWING DESCRIPTION OF THE JUNIOR SUBORDINATED DEBENTURES, IN WHICH
FINANCE TRUST I WILL INVEST THE PROCEEDS FROM THE ISSUANCE AND SALE OF THE TRUST
SECURITIES, IS NOT COMPLETE. YOU SHOULD ALSO READ THE DESCRIPTION OF THE GENERAL
TERMS AND PROVISIONS OF THE JUNIOR SUBORDINATED DEBT SECURITIES IN THE
ACCOMPANYING PROSPECTUS UNDER THE CAPTION "DESCRIPTION OF DEBT SECURITIES," THE
INDENTURE DATED AS OF           , 1999 (THE "INDENTURE") BETWEEN UNBC AND THE
FIRST NATIONAL BANK OF CHICAGO, AS TRUSTEE (THE "INDENTURE TRUSTEE"), AND AN
OFFICER'S CERTIFICATE OF AN EXECUTIVE OFFICER OF UNBC DATED           , 1999
(THE "OFFICER'S CERTIFICATE") SUPPLEMENTING THE INDENTURE. WE WILL FILE THE
INDENTURE AND THE OFFICER'S CERTIFICATE AS AN EXHIBIT TO THE REGISTRATION
STATEMENT OF WHICH THE ACCOMPANYING PROSPECTUS FORMS A PART. CERTAIN CAPITALIZED
TERMS USED IN THIS SECTION ARE DEFINED IN THE INDENTURE OR THE OFFICER'S
CERTIFICATE.
 
    Under certain circumstances involving the dissolution of Finance Trust I,
the Junior Subordinated Debentures may be distributed to the holders of the
Trust Securities in liquidation of Finance Trust I. See "Description of the
Capital Securities--Liquidation Distribution upon Dissolution" above. If the
Junior Subordinated Debentures are distributed to the holders of the Capital
Securities, UNBC will use its best efforts to have the Junior Subordinated
Debentures listed on the New York Stock Exchange or with another organization on
which the Capital Securities are then listed.
 
GENERAL
 
    The Junior Subordinated Debentures will be issued as unsecured debt under
the Indenture. The Junior Subordinated Debentures will be limited in aggregate
principal amount to $  -  , such amount being the sum of the aggregate stated
Liquidation Amount of the Capital Securities and the capital contributed by UNBC
in exchange for the Common Securities.
 
    The Junior Subordinated Debentures are not subject to a sinking fund
provision. The entire principal amount of the Junior Subordinated Debentures
will mature and become due and payable, together with any accrued and unpaid
interest thereon including Compound Interest (as defined in "Description of the
Junior Subordinated Debentures--Option to Extend Interest Payment Period" below)
and Additional Interest, if any, on            , 20 - .
 
    If Junior Subordinated Debentures are distributed to holders of Capital
Securities in liquidation of such holders' interests in Finance Trust I, such
Junior Subordinated Debentures will initially be issued as a Global Security. As
described in "Description of the Junior Subordinated Debentures--Discontinuance
of the Depositary's Services" below, under certain limited circumstances, Junior
Subordinated Debentures may be issued in certificated form in exchange for a
Global Security. See "--Book-Entry and Settlement" below and "Description of
Debt Securities--Registered Global Securities" in the accompanying prospectus.
In the event that Junior Subordinated Debentures are issued in certificated
form, such Junior Subordinated Debentures will be in denominations of $25 and
integral multiples thereof and may be transferred or exchanged at the offices
described below. Payments on Junior Subordinated Debentures issued as a Global
Security will be made to DTC, a successor depositary or, in the event that no
depositary is used, a paying agent for the Junior Subordinated Debentures. In
the event Junior Subordinated Debentures are issued in certificated form,
principal and interest will be payable, the transfer of the Junior Subordinated
Debentures will be registrable and Junior Subordinated Debentures will be
exchangeable for Junior Subordinated Debentures of other denominations of a like
aggregate principal amount at the corporate trust office of the Indenture
Trustee in New York, New York; PROVIDED that, at the option of UNBC, payment of
interest may be made by check mailed to the address of the persons entitled
thereto.
 
    The Indenture does not contain provisions that afford holders of the Junior
Subordinated Debentures protection in the event of a highly leveraged
transaction involving UNBC that would adversely affect such holders.
 
                                      S-92
<PAGE>
SUBORDINATION
 
    The Indenture provides that the Junior Subordinated Debentures are
subordinated and junior in right of payment to all Senior Indebtedness of UNBC.
No payment of principal (including redemption payments) or interest on the
Junior Subordinated Debentures may be made (1) if any Senior Indebtedness of
UNBC is not paid when due and if any applicable grace period with respect to
such default has ended and such default has not been cured or waived or ceased
to exist or (2) if the maturity of any Senior Indebtedness of UNBC has been
accelerated because of a default and such acceleration has not been rescinded.
Upon any distribution of assets of UNBC to creditors upon any dissolution,
winding-up, liquidation or reorganization, whether voluntary or involuntary, or
in bankruptcy, insolvency, receivership or other proceedings, all principal,
premium, if any, and interest due or to become due on all Senior Indebtedness of
UNBC must be paid in full before the holders of Junior Subordinated Debentures
are entitled to receive or retain any payment. In such event, any payment or
distribution on the Junior Subordinated Debentures (other than certain payments
in property) that would otherwise be payable in respect of the Junior
Subordinated Debentures (but for the subordination provision) shall be paid or
delivered directly to the holders of Senior Indebtedness in accordance with the
priorities then existing among such holders until all Senior Indebtedness shall
have been paid in full.
 
    If any payment or distribution on account of the Junior Subordinated
Debentures (other than certain payments in property) is received by the
Indenture Trustee or any holder of any Junior Subordinated Debentures in
contravention of any of the terms hereof and before all Senior Indebtedness
shall have been paid in full, such payment or distribution shall be received in
trust for the benefit of, and shall be paid over or delivered and transferred
to, the holders of the Senior Indebtedness at the time outstanding in accordance
with the priorities then existing among such holders and creditors for
application to the payment of all Senior Indebtedness then outstanding. The
rights of the holders of the Junior Subordinated Debentures will be subrogated
to the rights of the holders of Senior Indebtedness to the extent of any payment
made by UNBC to such holders of Senior Indebtedness that otherwise would have
been made to the holders of the Junior Subordinated Debentures but for the
subordination provisions.
 
    The term "Senior Indebtedness" means:
 
    (1) the principal, premium, if any, and interest in respect of:
 
    - indebtedness of UNBC for money borrowed; and
 
    - indebtedness evidenced by securities, debentures, bonds or other similar
      instruments issued by UNBC;
 
    (2) all capital lease obligations of UNBC;
 
    (3) all obligations of UNBC issued or assumed as the deferred purchase price
of property, all conditional sale obligations of UNBC and all obligations of
UNBC under any title retention agreement (but excluding trade accounts payable
arising in the ordinary course of business);
 
    (4) all obligations of UNBC for reimbursement on any letter of credit,
banker's acceptance, security purchase facility or similar credit transaction;
 
    (5) all obligations of the type referred to in clauses (1) through (4) above
of other persons for the payment of which UNBC is responsible or liable as
obligor, guarantor or otherwise; and
 
    (6) all obligations of the type referred to in clauses (1) through (5) above
of other persons secured by any lien on any property or asset of UNBC (whether
or not such obligation is assumed by UNBC);
 
except for:
 
    (a) any such indebtedness that is by its terms subordinated to or PARI PASSU
with the Junior Subordinated Debentures; and
 
                                      S-93
<PAGE>
    (b) any indebtedness between or among such obligor or its affiliates,
including all other debt securities and guarantees in respect of those debt
securities, to (x) any other Trust (as defined in the accompanying prospectus),
or a trustee of such Trust, and (y) any other trust, or a trustee of such trust,
partnership or other entity affiliated with UNBC that is a financing vehicle of
UNBC (a "financing entity") in connection with the issuance by such financing
entity of Capital Securities or other securities that rank PARI PASSU with, or
junior to, the Capital Securities. Such Senior Indebtedness shall continue to be
Senior Indebtedness and be entitled to the benefits of the subordination
provisions irrespective of any amendment, modification or waiver of any term of
such Senior Indebtedness.
 
    The Indenture does not limit the aggregate amount of Senior Indebtedness
that may be issued by UNBC. As of September 30, 1998, Senior Indebtedness of
UNBC aggregated approximately $  -  million. In addition, the Junior
Subordinated Debentures also will be effectively subordinated to all obligations
of UNBC's subsidiaries.
 
INTEREST
 
    Each Subordinated Debenture will bear interest at the rate of   % per annum
from the original date of issuance until the principal becomes due and payable,
and on any overdue principal and on any overdue installment of interest at the
same rate, compounded and payable quarterly in arrears on             ,
            ,             and             of each year (each, an "Interest
Payment Date"), commencing             , 1999, to the person in whose name such
Subordinated Debenture is registered at the close of business on the Business
Day preceding such Interest Payment Date. In the event the Junior Subordinated
Debentures do not remain in book-entry only form, the record dates will be 15
calendar days (whether or not a Business Day) prior to the Interest Payment
Date. It is anticipated that Finance Trust I will be the sole holder of the
Junior Subordinated Debentures.
 
    The amount of interest payable for any period will be computed on the basis
of a 360-day year of twelve 30-day months, and, for any period shorter than a
quarter, on the basis of the actual number of days elapsed per 30-day month. The
amount of interest payable for any period shorter than a full quarter for which
interest is computed will be computed on the basis of the actual number of days
elapsed per 30-day month. In the event that any date on which interest is
payable on the Junior Subordinated Debentures is not a Business Day, then
payment of the interest payable on such date will be made on the next day that
is a Business Day (and without any interest or other payment in respect of any
such delay), except that, if such Business Day is in the next calendar year,
then such payment shall be made on the immediately preceding Business Day, in
each case with the same force and effect as if made on such date.
 
OPTION TO EXTEND INTEREST PAYMENT PERIOD
 
    As long as UNBC is not in default on the payment of interest on the Junior
Subordinated Debentures, UNBC shall have the right at any time, and from time to
time, during the term of the Junior Subordinated Debentures to defer payments of
interest by extending the interest payment period for a period not exceeding 20
consecutive quarters (but not beyond the maturity date of the Junior
Subordinated Debentures), at the end of which Extension Period UNBC shall pay
all interest then accrued and unpaid, together with interest thereon compounded
quarterly at the rate specified for the Junior Subordinated Debentures to the
extent permitted by applicable law ("Compound Interest") plus any Additional
Interest. During any Extension Period:
 
    - UNBC may not declare or pay any dividends on, make any distribution with
      respect to, or redeem, purchase, acquire or make a liquidation payment
      with respect to, any of its capital stock; and
 
    - UNBC may not make any payment of interest, principal or premium, if any,
      on or repay, repurchase or redeem any debt securities issued by UNBC that
      rank PARI PASSU with or junior in interest to the Junior Subordinated
      Debentures or make any guarantee payments with respect to the foregoing;
 
                                      S-94
<PAGE>
PROVIDED, HOWEVER, that, the foregoing restrictions do not apply to
 
    - repurchases, redemptions or other acquisitions of shares of capital stock
      of UNBC in connection with (1) any employment contract, benefit plan or
      other similar arrangement with or for the benefit of any one or more
      employees, officers, directors or consultants, (2) a dividend reinvestment
      or shareholder stock purchase plan or (3) the issuance of capital stock of
      UNBC (or securities convertible into or exercisable for such capital
      stock) as consideration in an acquisition transaction entered into prior
      to such Extension Period;
 
    - an exchange, redemption or conversion of any class or series of UNBC's
      capital stock (or any capital stock of a subsidiary of UNBC) for any class
      or series of UNBC's capital stock or of any class or series of UNBC's
      indebtedness for any class or series of UNBC's capital stock;
 
    - the purchase of fractional interests in shares of UNBC's capital stock
      pursuant to the conversion or exchange provisions of such capital stock or
      the security being converted or exchanged;
 
    - any declaration of a dividend in connection with any shareholder's rights
      plan, or the issuance of rights, stock or other property under any
      shareholder's rights plan, or the redemption or repurchase of rights
      pursuant thereto;
 
    - any dividend in the form of stock, warrants, options or other rights where
      the dividend stock or the stock issuable upon exercise of such warrants,
      options or other rights is the same stock as that on which the dividend is
      being paid or ranks PARI PASSU with or junior to such stock; or
 
    - payments by UNBC under the Guarantee or under any similar guarantee by
      UNBC with respect to any trust common or trust preferred securities of its
      subsidiaries.
 
    Prior to the termination of any Extension Period, UNBC may further defer
payments of interest by extending the interest payment period; PROVIDED that the
Extension Period, including all such previous and further extensions, may not
exceed 20 consecutive quarters or extend beyond the maturity date of the Junior
Subordinated Debentures. Upon the termination of any Extension Period and the
payment of all amounts then due, UNBC may commence a new Extension Period,
subject to the above requirements. If the Property Trustee is the sole holder of
the Junior Subordinated Debentures, UNBC shall give the Regular Trustees and the
Property Trustee notice of its selection of an Extension Period one Business Day
prior to the earlier of (1) the next date Distributions on the Capital
Securities are payable or (2) the date the Regular Trustees are required to give
notice to the New York Stock Exchange (or other applicable self-regulatory
organization) or to the holders of record of the Capital Securities. The Regular
Trustees shall give notice of UNBC's selection of such Extension Period to the
holders of the Capital Securities. If the Property Trustee is not the sole
holder of the Junior Subordinated Debentures, UNBC shall give the holders of the
Junior Subordinated Debentures notice of its selection of an Extension Period
ten Business Days prior to the earlier of (1) the next interest payment date or
(2) the date upon which UNBC is required to give notice to the New York Stock
Exchange (or other applicable self-regulatory organization) or to holders of the
Junior Subordinated Debentures of the record or payment date of such related
interest payment. UNBC has no present intention of exercising its right to defer
payments of interest by extending the interest payment period on the Junior
Subordinated Debentures.
 
ADDITIONAL INTEREST
 
    If at any time while the Property Trustee is the holder of the Junior
Subordinated Debentures, Finance Trust I shall be required to pay any taxes,
duties, assessments or governmental charges of whatever nature (other than
withholding taxes) imposed by the United States or any other taxing authority,
then, in any such case, UNBC will pay as additional interest on the Junior
Subordinated Debentures such additional amounts ("Additional Interest") as shall
be required so that the net amounts received and retained by Finance Trust I
after paying any such taxes, duties, assessments or other governmental charges
 
                                      S-95
<PAGE>
will be not less than the amounts Finance Trust I would have received had no
such taxes, duties, assessments or other governmental charges been imposed.
 
OPTIONAL REDEMPTION
 
    UNBC shall have the right, subject to receipt of prior approval by the
Federal Reserve if such approval is then required under applicable capital
guidelines or policies, to redeem the Junior Subordinated Debentures (1) on or
after            , 2004 in whole at any time or in part from time to time or (2)
before            , 2004, in whole (but not in part) at any time within 90 days
following the occurrence and continuation of a Tax Event, an Investment Company
Event or a Regulatory Capital Event as described under "Description of the
Capital Securities--Redemption" above, upon not less than 30 or more than 60
days' notice, at a redemption price equal to 100% of the principal amount to be
redeemed plus any accrued and unpaid interest, including any Compounded Interest
and Additional Interest, if any, to the redemption date.
 
    UNBC's right to redeem the Junior Subordinated Debentures under part (2) of
the preceding paragraph shall be subject to the condition that if at the time
there is available to UNBC or Finance Trust I the opportunity to eliminate,
within the notice period, the Tax Event, Investment Company Event or Regulatory
Capital Event by taking some ministerial action ("Ministerial Action"), such as
filing a form or making an election, or pursuing some other similar reasonable
measure that will have no adverse effect on UNBC, Finance Trust I or the holders
of the Trust Securities and will involve no material cost, UNBC shall pursue
such measures in lieu of redemption. UNBC shall not have the right to redeem the
Junior Subordinated Debentures while Finance Trust I is pursuing any Ministerial
Action pursuant to the Trust Declaration.
 
    If a partial redemption of the Capital Securities resulting from a partial
redemption of the Junior Subordinated Debentures would result in the delisting
of the Capital Securities, UNBC may only redeem the Junior Subordinated
Debentures in whole.
 
    UNBC may not redeem fewer than all of the Junior Subordinated Debentures
unless all accrued and unpaid interest has been paid on all Junior Subordinated
Debentures for all quarterly interest payment periods terminating on or prior to
the date of redemption.
 
OPTION TO ACCELERATE MATURITY DATE
 
    If a Tax Event described in clause (3) of the definition of "Tax Event"
occurs, UNBC will have the right, prior to a dissolution of Finance Trust I, to
accelerate the stated maturity of the Junior Subordinated Debentures to the
minimum extent required so that interest on the Junior Subordinated Debentures
will be deductible for United States federal income tax purposes, but in no
event may the resulting maturity of the Junior Subordinated Debentures be less
than 15 years from the date of original issuance. The stated maturity may be
accelerated only if UNBC shall have received an opinion of nationally recognized
independent counsel experienced in such matters to the effect that:
 
    - following such acceleration, interest paid on the Junior Subordinated
      Debentures will be deductible for United States federal income tax
      purposes;
 
    - the holders of Capital Securities will not recognize income, gain or loss
      for United States federal income tax purposes as a result of such
      acceleration, and will be subject to United States federal income tax in
      the same amount, in the manner and at the same times as would have been
      the case if such acceleration had not occurred; and
 
    - such acceleration will not cause Finance Trust I to be classified as other
      than a grantor trust for United States federal income tax purposes.
 
                                      S-96
<PAGE>
INDENTURE EVENTS OF DEFAULT
 
    If any Indenture Event of Default shall occur and be continuing, the
Property Trustee, as the holder of the Junior Subordinated Debentures, will have
the right to declare the principal of and the interest on the Junior
Subordinated Debentures (including any Compound Interest and Additional
Interest, if any) and any other amounts payable under the Indenture to be
forthwith due and payable and to enforce its other rights as a creditor with
respect to the Junior Subordinated Debentures. See "Description of Debt
Securities--Events of Default" in the accompanying prospectus for a description
of the events of default. An Indenture Event of Default also constitutes a
Declaration Event of Default. The holders of Capital Securities in certain
circumstances have the right to direct the Property Trustee to exercise its
rights as the holder of the Junior Subordinated Debentures. See "Description of
the Capital Securities--Declaration Events of Default" and "--Voting Rights"
above.
 
ENFORCEMENT OF CERTAIN RIGHTS BY HOLDERS OF CAPITAL SECURITIES
 
    The holders of a majority in aggregate Liquidation Amount of the Capital
Securities will have the right to (1) direct the time, method and place of
conducting any proceeding for any remedy available to the Property Trustee or to
direct the exercise of any trust or power conferred upon the Property Trustee
under the Trust Declaration, (2) waive any past default or (3) exercise any
right to rescind or annul a declaration that the principal of all the Junior
Subordinated Debentures shall be due and payable; PROVIDED, HOWEVER, that where
a consent under the Indenture requires the consent of all holders of the Junior
Subordinated Debentures affected thereby, the Property Trustee may only give
such consent at the direction of all holders of the Capital Securities. If the
Property Trustee fails to enforce its rights under the Junior Subordinated
Debentures, to the fullest extent permitted by law, a holder of Capital
Securities may, after such holder's written request to the Property Trustee to
enforce such rights, institute a legal proceeding directly against UNBC to
enforce the Property Trustee's rights under the Junior Subordinated Debentures
without first instituting any legal proceeding against the Property Trustee or
any other person or entity.
 
BOOK-ENTRY AND SETTLEMENT
 
    If distributed to holders of Capital Securities in connection with the
involuntary or voluntary dissolution, winding-up or liquidation of Finance Trust
I, the Junior Subordinated Debentures will be issued in the form of one or more
global certificates (each, a "Global Security") registered in the name of a
depositary or its nominee. Except under the limited circumstances described
below, Junior Subordinated Debentures represented by a Global Security will not
be exchangeable for, and will not otherwise be issuable as, Junior Subordinated
Debentures in definitive form. See "--Discontinuance of the Depositary's
Services." Global Securities may not be transferred except by the depositary to
a nominee of the depositary or by a nominee of the depositary to the depositary
or another nominee of the depositary or to a successor depositary or its
nominee.
 
    The laws of some jurisdictions require that certain purchasers of securities
take physical delivery of such securities in definitive form. Such laws may
impair the ability to transfer beneficial interests in such Global Securities.
 
    Except as provided below, owners of beneficial interests in a Global
Security will not be entitled to receive physical delivery of Junior
Subordinated Debentures in definitive form and will not be considered the
holders thereof for any purpose under the Indenture, and no Global Security
representing Junior Subordinated Debentures will be exchangeable, except for
another Global Security of like denomination and tenor to be registered in the
name of the depositary or its nominee or to a successor depositary or its
nominee. Accordingly, each beneficial owner must rely on the procedures of the
depositary or, if such person is not a participant, on the procedures of the
participant through which such person owns its interest to exercise any rights
of a holder under the Indenture.
 
                                      S-97
<PAGE>
THE DEPOSITARY
 
    If Junior Subordinated Debentures are distributed to holders of Capital
Securities in liquidation of such holders' interests in Finance Trust I, DTC
will act as securities depositary for the Junior Subordinated Debentures. For a
description of DTC and the specific terms of the depositary arrangements, see
"Description of the Capital Securities--Book-Entry Only Issuance--The Depository
Trust Company" above. As of the date of this prospectus supplement, that
description of DTC's book-entry system and DTC's practices as they relate to
purchases, transfers, notices and payments with respect to the Capital
Securities apply in all material respects to any debt obligations represented by
one or more Global Securities held by DTC. UNBC may appoint a successor to DTC
or any successor depositary in the event DTC or such successor depositary is
unable or unwilling to continue as a depositary for the Global Securities.
 
    None of UNBC, Finance Trust I, the Indenture Trustee, any paying agent and
any other agent of UNBC or the Indenture Trustee will have any responsibility or
liability for any aspect of the records relating to or payments made on account
of beneficial ownership interests in a Global Security for such Junior
Subordinated Debentures or for maintaining, supervising or reviewing any records
relating to such beneficial ownership interests.
 
DISCONTINUANCE OF THE DEPOSITARY'S SERVICES
 
    A Global Security shall be exchangeable for Junior Subordinated Debentures
registered in the names of persons other than the depositary or its nominee only
if (1) the depositary notifies UNBC that it is unwilling or unable to continue
as a depositary for such Global Security and no successor depositary shall have
been appointed, (2) the depositary ceases to be a clearing agency registered
under the Securities Exchange Act of 1934 at a time the depositary is required
to be so registered to act as such depositary and no successor depositary shall
have been appointed, (3) UNBC, in its sole discretion, determines that such
Global Security shall be so exchangeable or (4) there shall have occurred an
Indenture Event of Default. Any Global Security that is exchangeable pursuant to
the preceding sentence shall be exchangeable for Junior Subordinated Debentures
registered in such names as the depositary shall direct. It is expected that
such instructions will be based upon directions received by the depositary from
its participants with respect to ownership of beneficial interests in such
Global Security.
 
MISCELLANEOUS
 
    The Indenture provides that UNBC will pay all fees and expenses related to
(1) the offering of the Trust Securities and the Junior Subordinated Debentures,
(2) the organization, maintenance and dissolution of Finance Trust I, (3) the
retention of the Finance Trustees and (4) the enforcement by the Property
Trustee of the rights of the holders of the Capital Securities.
 
                          DESCRIPTION OF THE GUARANTEE
 
    THE FOLLOWING DESCRIPTION OF THE GUARANTEE IS NOT COMPLETE. YOU SHOULD ALSO
READ THE DESCRIPTION OF THE GENERAL TERMS AND PROVISIONS OF THE TRUST PREFERRED
SECURITIES GUARANTEES IN THE ACCOMPANYING PROSPECTUS UNDER THE CAPTION
"DESCRIPTION OF THE TRUST PREFERRED SECURITIES GUARANTEES" AND THE GUARANTEE. WE
WILL FILE THE GUARANTEE AS AN EXHIBIT TO THE REGISTRATION STATEMENT OF WHICH THE
ACCOMPANYING PROSPECTUS FORMS A PART.
 
GENERAL
 
    Pursuant to the Guarantee, UNBC will irrevocably and unconditionally agree,
to the extent set forth therein, to pay in full to the holders of the Capital
Securities issued by Finance Trust I, the Guarantee Payments (as defined below),
as and when due, regardless of any defense, right of set-off or counterclaim
which Finance Trust I may have or assert. The following payments with respect to
the Capital Securities
 
                                      S-98
<PAGE>
(the "Guarantee Payments"), to the extent not paid by Finance Trust I, will be
subject to the Guarantee (without duplication):
 
    (1) any accumulated and unpaid Distributions that are required to be paid on
the Capital Securities, to the extent UNBC has made a payment of interest or
principal on the Junior Subordinated Debentures;
 
    (2) the Redemption Price, to the extent UNBC has made a payment of interest
or principal on the Junior Subordinated Debentures, with respect to any Capital
Securities called for redemption; and
 
    (3) upon a voluntary or involuntary dissolution, winding-up or termination
of Finance Trust I (other than in connection with the distribution of Junior
Subordinated Debentures to the holders of the Capital Securities or the
redemption of all of the Capital Securities upon the maturity or redemption of
the Junior Subordinated Debentures), the lesser of (a) the aggregate of the
Liquidation Amount and all accumulated and unpaid Distributions on the Capital
Securities to the date of payment to the extent Finance Trust I has funds
legally available therefor and (b) the amount of assets of Finance Trust I
remaining available for distribution to holders of the Capital Securities in
liquidation of Finance Trust I. UNBC's obligation to make a Guarantee Payment
may be satisfied by direct payment of the required amounts by UNBC to the
holders of the Capital Securities or by causing Finance Trust I to pay such
amounts to such holders.
 
    The Guarantee will be a full and unconditional guarantee with respect to the
Capital Securities from the time of issuance of the Capital Securities but will
not apply to any payment of Distributions due to the extent Finance Trust I
lacks funds legally available therefor as a result of a failure by UNBC to make
payments of interest or principal on the Junior Subordinated Debentures. If UNBC
does not make interest payments on the Junior Subordinated Debentures, Finance
Trust I will not pay Distributions on the Capital Securities and will not have
funds legally available therefor, and, in such event, holders of the Capital
Securities would not be able to rely upon the Guarantee for payment of such
amounts. Instead, a holder of the Capital Securities would be required to rely
on the enforcement (1) by the Property Trustee of its rights, as registered
holder of the Junior Subordinated Debentures, against UNBC pursuant to the terms
of the Junior Subordinated Debentures or (2) by such holder of Capital
Securities of its rights against UNBC to enforce payments on the Junior
Subordinated Debentures in certain circumstances. See "Description of the
Capital Securities--Distributions" above.
 
STATUS OF THE GUARANTEE
 
    The Guarantee will constitute an unsecured obligation of UNBC and will rank:
 
    - subordinate and junior in right of payment to all other liabilities of
      UNBC (except those obligations made equal or junior to its obligations
      under the Guarantee);
 
    - equal with the most senior preferred or preference stock now or hereafter
      issued by UNBC and with any Guarantee now or hereafter entered into by
      UNBC in respect of any preferred or preference stock of any affiliate of
      UNBC; and
 
    - senior to UNBC's Common Stock. The Guarantee will constitute a guarantee
      of payment and not of collection (that is, a holder of Capital Securities
      may institute a legal proceeding directly against UNBC to enforce its
      rights under the Guarantee without first instituting a legal proceeding
      against any other person or entity). The terms of the Capital Securities
      provide that each holder of Capital Securities by acceptance thereof
      agrees to the subordination provisions and other terms of the Guarantee.
 
CERTAIN COVENANTS OF UNBC
 
    UNBC has covenanted in the Guarantee that, so long as any Capital Securities
remain outstanding, if (1) UNBC has exercised its option to defer interest
payments on the Junior Subordinated Debentures by extending the interest payment
period and such extension period, or any extension thereof, shall be
 
                                      S-99
<PAGE>
continuing, (2) UNBC shall be in default with respect to its payment or other
obligations under the Guarantee or (3) there shall have occurred and be
continuing a Declaration Event of Default or any event that, with the giving of
notice or lapse of time or both, would constitute a Declaration Event of
Default, then:
 
    - UNBC may not declare or pay dividends on, make distributions with respect
      to, redeem, purchase or acquire, or make a liquidation payment with
      respect to, any of its capital stock; and
 
    - UNBC may not make any payment of interest, principal or premium, if any,
      on or repay, repurchase or redeem any debt securities issued by UNBC
      (including other junior subordinated deferrable debentures) that rank PARI
      PASSU with or junior to the Junior Subordinated Debentures or make any
      guarantee payments with respect to the foregoing;
 
PROVIDED, HOWEVER, that, the foregoing restrictions do not apply to:
 
    - repurchases, redemptions or other acquisitions of shares of capital stock
      of UNBC in connection with (1) any employment contract, benefit plan or
      other similar arrangement with or for the benefit of any one or more
      employees, officers, directors or consultants, (2) a dividend reinvestment
      or shareholder stock purchase plan or (3) the issuance of capital stock of
      UNBC (or securities convertible into or exercisable for such capital
      stock) as consideration in an acquisition transaction entered into prior
      to such Extension Period;
 
    - an exchange, redemption or conversion of any class or series of UNBC's
      capital stock (or any capital stock of a subsidiary of UNBC) for any class
      or series of UNBC's capital stock or of any class or series of UNBC's
      indebtedness for any class or series of UNBC's capital stock;
 
    - the purchase of fractional interests in shares of UNBC's capital stock
      pursuant to the conversion or exchange provisions of such capital stock or
      the security being converted or exchanged;
 
    - any declaration of a dividend in connection with any shareholder's rights
      plan, or the issuance of rights, stock or other property under any
      shareholder's rights plan, or the redemption or repurchase of rights
      pursuant thereto;
 
    - any dividend in the form of stock, warrants, options or other rights where
      the dividend stock or the stock issuable upon exercise of such warrants,
      options or other rights is the same stock as that on which the dividend is
      being paid or ranks PARI PASSU with or junior to such stock; or
 
    - payments by UNBC under the Guarantee or under any similar guarantee by
      UNBC with respect to any trust common or trust preferred securities of its
      subsidiaries.
 
MODIFICATION OF THE GUARANTEE; ASSIGNMENT
 
    Except with respect to any changes that do not adversely affect the rights
of holders of the Capital Securities in any material respect (in which case no
vote will be required), the Guarantee may be amended only with the prior
approval of the holders of not less than a majority in Liquidation Amount of the
outstanding Capital Securities. All guarantees and agreements contained in the
Guarantee will bind the successors, assignees, receivers, trustees and
representatives of UNBC and will inure to the benefit of the holders of the
Capital Securities then outstanding.
 
EVENTS OF DEFAULT
 
    An "Event of Default" under the Guarantee will occur upon the failure of
UNBC to make any of its payments or to perform other obligations thereunder. The
holders of a majority in Liquidation Amount of the Capital Securities have the
right to direct the time, method and place of conducting any proceeding for any
remedy available to the Guarantee Trustee in respect of the Guarantee or to
direct the exercise of any trust or power conferred upon the Guarantee Trustee
under the Guarantee.
 
                                     S-100
<PAGE>
    If the Guarantee Trustee fails to enforce the Guarantee, any holder of
Capital Securities may, after such holder's written request to the Guarantee
Trustee to enforce the Guarantee, institute a legal proceeding directly against
UNBC to enforce the Guarantee Trustee's rights under the Guarantee without first
instituting a legal proceeding against Finance Trust I, the Guarantee Trustee,
or any other person or entity. Notwithstanding the foregoing, if UNBC has failed
to make a guarantee payment, a holder of Capital Securities may directly
institute a proceeding against UNBC for enforcement of the Guarantee for such
payment.
 
    UNBC is required to file annually with the Guarantee Trustee an officer's
certificate as to UNBC's compliance with all conditions under the Guarantee.
 
INFORMATION CONCERNING THE GUARANTEE TRUSTEE
 
    The Guarantee Trustee, prior to the occurrence of a default under the
Guarantee, undertakes to perform only such duties as are specifically set forth
in the Guarantee and, after default with respect to the Guarantee, will exercise
the same degree of care as a prudent individual would exercise in the conduct of
his or her own affairs. Subject to such provision, the Guarantee Trustee is
under no obligation to exercise any of the powers vested in it by the Guarantee
at the request of any holder of the Capital Securities unless it is offered
reasonable indemnity against the costs, expenses and liabilities that might be
incurred thereby.
 
GOVERNING LAW
 
    The Guarantee will be governed by, and construed in accordance with, the
internal laws of the State of New York.
 
                                     S-101
<PAGE>
         EFFECT OF OBLIGATIONS UNDER THE JUNIOR SUBORDINATED DEBENTURES
                               AND THE GUARANTEE
 
    As set forth in the Trust Declaration, the sole purpose of Finance Trust I
is to issue the Trust Securities evidencing undivided beneficial interests in
the assets of Finance Trust I and to invest the proceeds from such issuance in
the Junior Subordinated Debentures.
 
    As long as payments of interest and other payments are made when due on the
Junior Subordinated Debentures, such payments will be sufficient to cover
Distributions and payments due on the Trust Securities because of the following
factors: (1) the aggregate principal amount of the Junior Subordinated
Debentures will be equal to the sum of the aggregate stated Liquidation Amount
of the Trust Securities; (2) the interest rate and the interest and other
payment dates on the Junior Subordinated Debentures will match the distribution
rate and distribution and other payment dates for the Capital Securities; (3)
UNBC will pay all costs and expenses of the Trust to the extent not satisfied
out of the Trust's assets; and (4) the Finance Trustees are prohibited from
causing or permitting Finance Trust I to engage in any activity that is not
consistent with the purposes of Finance Trust I.
 
    Payments of Distributions and other payments due on the Capital Securities
(in each case, to the extent funds therefor are legally available) are
guaranteed by UNBC as and to the extent set forth under "Description of the
Guarantee" above. If UNBC does not make interest payments on the Junior
Subordinated Debentures purchased by Finance Trust I, Finance Trust I will not
have sufficient funds to pay Distributions on the Capital Securities. The
Guarantee is a full and unconditional guarantee from the time of its issuance
but does not apply to any payment of Distributions unless and until Finance
Trust I has sufficient funds legally available for the payment of such
Distributions.
 
    If UNBC fails to make interest or other payments on the Junior Subordinated
Debentures when due (taking account of any Extension Period), the Trust
Declaration provides a mechanism whereby the holders of the Capital Securities,
using the procedures described in "Description of the Capital Securities--Book-
Entry Only Issuance--The Depository Trust Company" and "--Voting Rights" above,
may direct the Property Trustee to enforce its rights under the Junior
Subordinated Debentures. If the Property Trustee fails to enforce its rights
under the Junior Subordinated Debentures, to the fullest extent permitted by
law, a holder of Capital Securities may, after such holder's written request to
the Property Trustee to enforce such rights, institute a legal proceeding
directly against UNBC to enforce the Property Trustee's rights under the Junior
Subordinated Debentures without first instituting any legal proceeding against
the Property Trustee or any other person. Notwithstanding the foregoing, if a
Declaration Event of Default has occurred and is continuing and such event is
attributable to the failure of UNBC to pay interest or principal on the Junior
Subordinated Debentures on the date such interest or principal is otherwise
payable (or in the case of redemption, the Redemption Date), then a holder of
Capital Securities may institute a Direct Action on or after the respective due
dates specified in the Junior Subordinated Debentures.
 
    UNBC, under the Guarantee, acknowledges that the Guarantee Trustee shall
enforce the Guarantee on behalf of the holders of the Capital Securities. If
UNBC fails to make payments under the Guarantee, the Guarantee provides a
mechanism whereby the holders of the Capital Securities may direct the Guarantee
Trustee to enforce its rights thereunder. If the Guarantee Trustee fails to
enforce the Guarantee, any holder of Capital Securities may, after such holder's
written request to the Guarantee Trustee to enforce the Guarantee, institute a
legal proceeding directly against UNBC to enforce the Guarantee Trustee's rights
under the Guarantee without first instituting a legal proceeding against Finance
Trust I, the Guarantee Trustee or any other person. Notwithstanding the
foregoing, if UNBC has failed to make a guarantee payment, a holder of Capital
Securities may directly institute a proceeding against UNBC for enforcement of
the Guarantee for such payment.
 
    UNBC and Finance Trust I believe that the rights of the holders of the
Capital Securities and the obligations of UNBC under the Trust Declaration, the
Guarantee, the Capital Securities, the Common
 
                                     S-102
<PAGE>
Securities, the Indenture and the Junior Subordinated Debentures collectively
provide the substantial equivalent of a full and unconditional guarantee by UNBC
of payments due on the Capital Securities. See "Description of the
Guarantee--General" above.
 
             CERTAIN UNITED STATES FEDERAL INCOME TAX CONSEQUENCES
 
GENERAL
 
    The following is a summary of certain United States federal income tax
consequences of the purchase, ownership, and disposition of Capital Securities.
Unless otherwise stated, this summary only deals with Capital Securities held as
capital assets (generally, assets held for investment) by holders who purchase
the Capital Securities upon original issuance. The tax treatment of a holder of
Capital Securities may vary depending on his particular situation. This summary
does not address all of the tax consequences that may be relevant to holders who
may be subject to special tax treatment such as, for example, financial
institutions, insurance companies, broker-dealers, tax-exempt organizations or,
except to the extent described below, non-U.S. Holders (as defined below). This
summary does not address the tax consequences to persons that have a functional
currency other than the United States dollar or the tax consequences to
shareholders, partners or beneficiaries of a holder of Capital Securities. In
addition, this summary does not address any aspects of state, local or foreign
tax laws. This summary is based on the United States federal income tax law in
effect as of the date hereof, which is subject to change, possibly on a
retroactive basis. Each investor is urged to consult his tax advisor as to the
particular tax consequences of purchasing, owning, and disposing of the Capital
Securities, including the application and effect of United States federal,
state, local, foreign and other tax laws.
 
    For purposes of this discussion, a "U.S. Holder" means (1) a citizen or
resident of the United States, (2) a corporation, partnership, or other entity
created or organized in the United States or under the laws of the United States
or of any political subdivision thereof, (3) an estate the income of which is
includible in gross income for United States federal income tax purposes
regardless of its source or (4) a trust the administration of which is subject
to the primary supervision of a United States court and which has one or more
United States persons who have the authority to control all substantial
decisions of the trust.
 
CLASSIFICATION OF THE JUNIOR SUBORDINATED DEBENTURES
 
    UNBC will treat the Junior Subordinated Debentures as indebtedness of UNBC
for United States federal income tax purposes and, by accepting the Capital
Securities, a holder agrees to treat the Junior Subordinated Debentures as
indebtedness for United States federal income tax purposes and to treat the
Capital Securities as evidence of an indirect beneficial ownership interest in
the Junior Subordinated Debentures. The remainder of this discussion assumes
that the Junior Subordinated Debentures will be classified as indebtedness of
UNBC for United States federal income tax purposes.
 
CLASSIFICATION OF THE TRUST
 
    In connection with the issuance of the Capital Securities, Skadden, Arps,
Slate, Meagher & Flom LLP, special tax counsel to UNBC and Finance Trust I ("Tax
Counsel"), will render an opinion generally to the effect that, under current
law and assuming full compliance with the terms of the Trust Declaration, the
Indenture and certain other documents, and based on certain facts and
assumptions contained in such opinion, Finance Trust I will be classified for
United States federal income tax purposes as a grantor trust and not as an
association taxable as a corporation. Accordingly, for United States federal
income tax purposes, each holder of Capital Securities will generally be treated
as the owner of an undivided interest in the Junior Subordinated Debentures, and
as further discussed below, each holder will be required to include in ordinary
income his allocable share of interest (or OID, if any) paid or accrued on the
Junior Subordinated Debentures.
 
                                     S-103
<PAGE>
POTENTIAL EXTENSION OF INTEREST PAYMENT PERIOD AND ORIGINAL ISSUE DISCOUNT
 
    In general, a debt instrument will be deemed to be issued with OID if there
is more than a "remote" contingency that periodic stated interest payments due
on the instrument will not be timely paid. Because the exercise by UNBC of its
option to defer the payment of stated interest on the Junior Subordinated
Debentures would prevent UNBC from declaring dividends on any class of equity,
UNBC believes that the likelihood of its exercising the option is "remote"
within the meaning of the applicable Treasury Regulations ("Regulations"). As a
result, UNBC intends to take the position, based on the advice of Tax Counsel,
that the Junior Subordinated Debentures will not be deemed to be issued with
OID. Accordingly, based on this position, stated interest payments on the Junior
Subordinated Debentures will be includible in the ordinary income of a holder at
the time that such payments are paid or accrued in accordance with the holder's
regular method of accounting. Because the Regulations have not yet been
addressed in any published rulings or other published interpretations issued by
the Internal Revenue Service, it is possible that the Internal Revenue Service
could take a position contrary to the position taken by UNBC.
 
    EXERCISE OF DEFERRAL OPTION.  If UNBC were to exercise its option to defer
the payment of stated interest on the Junior Subordinated Debentures, the Junior
Subordinated Debentures would be treated, solely for purpose of the OID rules,
as being "re-issued" at such time with OID. Under these rules, a holder of the
Capital Securities or the Junior Subordinated Debentures would be required to
include OID in ordinary income, on a current basis, over the period that the
instrument is held even though UNBC would not be making any actual cash payments
during the extended interest payment period. The amount of interest income
includible in the taxable income of a holder of the Junior Subordinated
Debentures would be determined on the basis of a constant yield method over the
remaining term of the instrument and the actual receipt of future payments of
stated interest on the Junior Subordinated Debentures would no longer be
separately reported as taxable income. The amount of OID that would accrue, in
the aggregate, during the extended interest payment period would be
approximately equal to the amount of the cash payment due at the end of such
period. Any OID included in income would increase the holder's adjusted tax
basis in the Capital Securities or the Junior Subordinated Debentures, as the
case may be, and the holder's actual receipt of interest payments would reduce
such basis.
 
    Because income on the Capital Securities will constitute interest income for
United States federal income tax purposes, corporate holders of Capital
Securities will not be entitled to claim a dividends received deduction in
respect of such income.
 
RECEIPT OF JUNIOR SUBORDINATED DEBENTURES OR CASH UPON LIQUIDATION OF THE
  FINANCE TRUST I
 
    If UNBC exercises its right to liquidate Finance Trust I and causes the
Junior Subordinated Debentures to be distributed on a PRO RATA basis to the
holders of the Capital Securities, such distribution would be treated as a
nontaxable event to the holders. In such event, each holder of Capital
Securities would have an adjusted tax basis in the Junior Subordinated
Debentures received in the liquidation equal to the adjusted tax basis in his
Capital Securities surrendered therefor and the holding period of the Junior
Subordinated Debentures would include the period during which the holder held
the Capital Securities. If, however, Finance Trust I is characterized, for
United States federal income tax purposes, as an association taxable as a
corporation at the time of such liquidation, the distribution of the Junior
Subordinated Debentures would constitute a taxable event to the holders of
Capital Securities.
 
    If the Junior Subordinated Debentures are redeemed for cash and the proceeds
of such redemption are distributed to holders in redemption of their Capital
Securities, the redemption would be treated as a sale of the Capital Securities
in which gain or loss would be recognized as described immediately below.
 
SALE OF CAPITAL SECURITIES
 
    Upon the sale of Capital Securities, a holder will recognize gain or loss in
an amount equal to the difference between his adjusted tax basis in the Capital
Securities and the amount realized in the sale
 
                                     S-104
<PAGE>
(except to the extent any amount received in respect of accrued but unpaid
interest not previously included in income). Such gain or loss will be capital
gain or loss and will be long term capital gain or loss if the Capital
Securities have been held for more than one year.
 
    The Capital Securities may trade at a price that does not accurately reflect
the value of accrued but unpaid interest (or OID if the Junior Subordinated
Debentures are treated as having been issued, or reissued, with OID) with
respect to the underlying Junior Subordinated Debentures. A holder who disposes
of his Capital Securities will be required to include in ordinary income (1) any
portion of the amount realized that is attributable to such accrued but unpaid
interest to the extent not previously included in income or (2) any amount of
OID that has accrued on his PRO RATA share of the underlying Junior Subordinated
Debentures during the taxable year of sale through the date of disposition. Any
such income inclusion will increase the holder's adjusted tax basis in his
Capital Securities disposed of. To the extent that the amount realized in the
sale is less than the holder's adjusted tax basis, a holder will recognize a
capital loss. Subject to certain limited exceptions, capital losses cannot be
applied to offset ordinary income for United States federal income tax purposes.
 
NON-U.S. HOLDERS
 
    Payments made to a holder of Capital Securities who is a non-U.S. Holder
will not be subject to withholding of United States federal income tax, provided
that (a) the beneficial owner of the Capital Securities does not actually or
constructively own 10% or more of the total combined voting power of all classes
of stock of UNBC entitled to vote, (b) the beneficial owner of the Capital
Securities is not a controlled foreign corporation that is related to UNBC
through stock ownership, and (c) either (A) the beneficial owner of the Capital
Securities certifies to Finance Trust I or its agent, under penalties of
perjury, that it is not a United States holder and provides his name and address
or (B) a securities clearing organization, bank or other financial institution
that holds customers' securities in the ordinary course of its trade or business
(a "Financial Institution"), and holds the Capital Securities in such capacity,
certifies to Finance Trust I or its agent, under penalties of perjury, that such
statement has been received from the beneficial owner by it or by a Financial
Institution between it and the beneficial owner and furnishes Finance Trust I or
its agent with a copy thereof. In addition, a non-U.S. Holder of Capital
Securities will not be subject to withholding of United States federal income
tax on any gain realized upon the sale or other disposition of a Capital
Security.
 
INFORMATION REPORTING AND BACKUP WITHHOLDING
 
    Generally, income on the Capital Securities will be reported to holders on
Forms 1099, which forms should be mailed to holders of Capital Securities by
January 31 following each calendar year.
 
    Payments on, and proceeds from the disposition of, Capital Securities may be
subject to a backup withholding tax of 31% unless the holder complies with
certain certification requirements. Any amounts withheld under the backup
withholding rules will be allowed as a refund or credit against the holder's
United States federal income tax liability, provided the required information is
filed with the Internal Revenue Service.
 
                          CERTAIN ERISA CONSIDERATIONS
 
    Each fiduciary of a pension, profit-sharing or other employee benefit plan
subject to Title I of the Employee Retirement Income Security Act of 1974
("ERISA") (a "Plan"), should consider the fiduciary standards of ERISA in the
context of the Plan's particular circumstances before authorizing an investment
in the Capital Securities. Accordingly, among other factors, the fiduciary
should consider whether the investment would satisfy the prudence and
diversification requirements of ERISA and would be consistent with the documents
and instruments governing the Plan.
 
                                     S-105
<PAGE>
    Section 406 of ERISA and Section 4975 of the Internal Revenue Code prohibit
Plans, as well as individual retirement accounts and Keogh plans subject to
Section 4975 of the Internal Revenue Code (also "Plans"), from engaging in
certain transactions involving "plan assets" with persons who are "parties in
interest" under ERISA or "disqualified persons" under the Internal Revenue Code
("Parties in Interest") with respect to such Plan. A violation of those
"prohibited transaction" rules may result in an excise tax or other liabilities
under ERISA and/or Section 4975 of the Internal Revenue Code for such persons,
unless exemptive relief is available under an applicable statutory or
administrative exemption. Employee benefit plans that are governmental plans (as
defined in Section 3(32) of ERISA), certain church plans (as defined in Section
3(33) of ERISA) and foreign plans (as described in Section 4(b)(5) of ERISA) are
not subject to the requirements of ERISA or Section 4975 of the Internal Revenue
Code.
 
    Under a regulation (the "Plan Assets Regulation") issued by the U.S.
Department of Labor, the assets of Finance Trust I would be deemed to be "plan
assets" of a Plan for purposes of ERISA and Section 4975 of the Internal Revenue
Code if a Plan makes an "equity" investment in the Trust and no exception were
applicable under the Plan Assets Regulation. An "equity interest" is defined
under the Plan Assets Regulation as any interest in an entity other than an
instrument that is treated as indebtedness under applicable local law and which
has no substantial equity features and specifically includes a beneficial
interest in a trust.
 
    If the assets of Finance Trust I were deemed to be "plan assets," the
persons providing services with respect to the assets of the trust may become
Parties in Interest or Disqualified Persons with respect to an investing Plan
and may be subject to the fiduciary responsibility provisions of Title I of
ERISA and the prohibited transaction provisions of ERISA and section 4975 of the
Internal Revenue Code with respect to transactions involving such assets. In
this regard, if the person or persons with discretionary responsibilities with
respect to the Junior Subordinated Debentures or the Guarantee were affiliated
with UNBC, any such discretionary actions taken with respect to such assets
could be deemed to constitute a prohibited transaction under ERISA or the
Internal Revenue Code (e.g., the use of such fiduciary authority or
responsibility in circumstances under which such person or persons have
interests that may conflict with the interests of the investing Plans and affect
the exercise of their best judgement as fiduciaries).
 
    Pursuant to an exception contained in the Plan Assets Regulation, the assets
of Finance Trust I would not be deemed to be "plan assets" of investing Plans if
the Capital Securities are "publicly-offered securities"--that is, they are (1)
widely held (I.E., owned by more than 100 investors independent of Finance Trust
I and of each other), (2) freely transferable and (3) sold to a Plan as part of
an offering pursuant to an effective registration statement under the Securities
Act of 1933, and then timely registered under Section 12(b) or 12(g) of the
Securities Exchange Act of 1934. It is expected that the Capital Securities will
meet the criteria of "publicly-offered securities" above, although no assurance
can be given in this regard. The underwriters expect that the Capital Securities
will be held by at least 100 independent investors at the conclusion of the
offering and that the Capital Securities will be freely transferable. The
Capital Securities will be sold as part of an offering pursuant to an effective
registration statement under the Securities Act of 1933, and then will be timely
registered under the Securities Exchange Act of 1934. All of the Common
Securities will be purchased and held by UNBC.
 
    Even if the assets of Finance Trust I are not deemed to be "Plan Assets" or
Plans investing in Finance Trust I, certain transactions involving the Finance
Trust I could be deemed to constitute direct or indirect prohibited transactions
under ERISA and Section 4975 of the Internal Revenue Code with respect to an
investing Plan. For example, if UNBC is a Party in Interest with respect to an
Investing Plan (either directly or by reason of the activities of one or more of
its affiliates), extensions of credit between UNBC and Finance Trust I (as
represented by the Junior Subordinated Debentures and the Guarantee) would
likely be prohibited by Section 406(a)(1)(B) of ERISA and Section 4975(c)(1)(B)
of the Internal Revenue Code, unless exemptive relief were available under an
applicable administrative exemption (see below).
 
                                     S-106
<PAGE>
    The U.S. Department of Labor has issued five prohibited transaction class
exemptions ("PTCEs") that may provide exemptive relief for direct or indirect
prohibited transactions resulting from the purchase or holding of the Capital
Securities. Those class exemptions are PTCE 96-23 (for certain transactions
determined by in-house asset managers). PTCE 95-60 (for certain transactions
involving insurance company general accounts), PTCE 91-38 (for certain
transactions involving bank collective investment funds), PTCE 90-1 (for certain
transactions involving insurance company separate accounts), and PTCE 84-14 (for
certain transactions determined by independent qualified professional asset
managers).
 
    The Capital Securities may not be purchased or held by any Plan, any entity
whose underlying assets include "plan assets" by reason of any Plan's investment
in the entity (a "Plan Asset Entity") or any person investing "plan assets" of
any Plan, unless such purchaser or holder is eligible for the exemptive relief
available under PTCE 96-23, 95-60, 91-38, 90-1 or 84-14. Any purchaser or holder
of the Capital Securities or any interest therein will be deemed to have
represented by its purchase and holding thereof that it either (a) is not a Plan
or a Plan Asset Entity and is not purchasing such securities on behalf of or
with "plan assets" of any Plan or (b) is eligible for the exemptive relief
available under PTCE 96-23, 95-60, 91-38, 90-1 or 84-14 with respect to such
purchase or holding.
 
    Due to the complexity of these rules and the penalties that may be imposed
upon persons involved in non-exempt prohibited transactions, it is particularly
important that fiduciaries or other persons considering purchasing the Capital
Securities on behalf of or with "plan assets" of any Plan consult with their
counsel regarding the potential consequences if the assets of Finance Trust I
were deemed to be "plan assets" and the availability of exemptive relief under
PTCE 96-23, 95-60, 91-38, 90-1 or 84-14.
 
                                     S-107
<PAGE>
                                  UNDERWRITERS
 
    Under the terms and subject to the conditions contained in an Underwriting
Agreement dated the date of this prospectus supplement, the underwriters named
below, for whom Morgan Stanley & Co. Incorporated, Salomon Smith Barney Inc. and
            are acting as representatives (the "Representatives"), have
severally agreed to purchase, and Finance Trust I has agreed to sell to them,
the respective number of Capital Securities set forth opposite the name of each
such underwriter. The activities of the underwriters are led jointly in this
transaction by Morgan Stanley & Co. Incorporated and Salomon Smith Barney Inc.
Morgan Stanley & Co. Incorporated is acting as the bookrunner for the offering
of the Capital Securities.
 
<TABLE>
<CAPTION>
                                                                                    NUMBER
                                                                                      OF
                                                                                    CAPITAL
NAME                                                                              SECURITIES
- -------------------------------------------------------------------------------  -------------
<S>                                                                              <C>
Morgan Stanley & Co. Incorporated..............................................
Salomon Smith Barney Inc.......................................................
 
                                                                                 -------------
    Total......................................................................
                                                                                 -------------
                                                                                 -------------
</TABLE>
 
    The underwriters are offering the Capital Securities subject to their
acceptance of the securities from Finance Trust I and subject to prior sale. The
Underwriting Agreement provides that the obligations of the several underwriters
to pay for and accept delivery of the Capital Securities are subject to the
approval of certain legal matters by their counsel and to certain other
conditions. The underwriters are obligated to take and pay for all the Capital
Securities if any are taken.
 
    The underwriters initially propose to offer part of the Capital Securities
directly to the public at the public offering price set forth on the cover page
hereof and part to certain dealers at a price that represents a concession not
in excess of $        per Capital Security. Any underwriter may allow, and such
dealers may reallow, a concession not in excess of $        per Capital Security
to other underwriters or to certain dealers. After the initial offering of the
Capital Securities, the offering price and other selling terms may from time to
time be varied by the Representatives.
 
    Finance Trust I has granted the underwriters an option, exercisable for 30
days from the date of this prospectus supplement, to purchase up to
additional Capital Securities at the public offering price set forth on the
cover page hereof. The underwriters may exercise such options solely for the
purpose of covering over-allotments, if any, incurred in the sale of the Capital
Securities offered hereby. If the underwriters' option is exercised in full, the
total price to the public for this offering would be $        , the total
underwriting discounts and commissions would be $        and the total proceeds
to Finance Trust I would be $        .
 
    Because the proceeds of the sale of the Capital Securities will ultimately
be used to purchase the Junior Subordinated Debentures of UNBC, the Underwriting
Agreement provides that UNBC will pay to the underwriters as compensation for
their services $        per Capital Security (or $        in the aggregate;
PROVIDED that such compensation will be $        per Capital Security sold to
certain institutions or $        in the aggregate if the underwriters' option to
purchase additional Capital Securities is exercised in full).
 
    UNBC and Finance Trust I have agreed that, without the prior written consent
of Morgan Stanley & Co. Incorporated, on behalf of the underwriters, they will
not, during the period beginning on the
 
                                     S-108
<PAGE>
date of the Underwriting Agreement and continuing to and including the closing
under the Underwriting Agreement:
 
    - offer, pledge, sell, contract to sell, sell any option or contract to
      purchase, purchase any option or contract to sell, grant any option, right
      or warrant to purchase, lend or otherwise transfer or dispose of, directly
      or indirectly, any securities that are substantially similar to the
      Capital Securities or securities convertible into or exercisable or
      exchangeable for such securities; or
 
    - enter into any swap or other arrangement that transfers to another, in
      whole or in part, any of the economic consequences of ownership of such
      securities,
 
whether any such transaction described above is to be settled by such
securities, in cash or otherwise, except in the offering.
 
    Prior to this offering, there has been no public market for the Capital
Securities. Application has been made to list the Capital Securities on the New
York Stock Exchange. Listing will be contingent upon meeting the requirements of
the New York Stock Exchange, including those relating to distribution. If
listing is approved, trading of the Capital Securities on the New York Stock
Exchange is expected to commence within a 30-day period after the date of this
prospectus supplement. The Representatives have advised Finance Trust I that
they presently intend to make a market in the Capital Securities prior to the
commencement of trading on the New York Stock Exchange. The Representatives will
have no obligation to make a market in the Capital Securities, however, and may
cease market making activities, if commenced, at any time. There can be no
assurance as to the liquidity of any trading market for the Capital Securities.
 
    In order to meet one of the requirements for listing the Capital Securities
on the New York Stock Exchange, the underwriters intend to sell Capital
Securities to a minimum of 400 beneficial holders in lots of 100 or more.
 
    Finance Trust I, UNBC and the underwriters have agreed to indemnify each
other against certain liabilities, including liabilities under the Securities
Act.
 
    In order to facilitate the offering of the Capital Securities, the
underwriters may engage in transactions that stabilize, maintain or otherwise
affect the price of the Capital Securities. Specifically, the underwriters may
over-allot in connection with the offering, creating a short position in the
Capital Securities for their own account. In addition, to cover over-allotments
or to stabilize the price of the Capital Securities, the underwriters may bid
for, and purchase, Capital Securities in the open market. Finally, the
underwriting syndicate may reclaim selling concessions allowed to an underwriter
or a dealer for distributing the Capital Securities in the offering, if the
syndicate repurchases previously distributed Capital Securities in transactions
to cover syndicate short positions, in stabilization transactions or otherwise.
Any of these activities may stabilize or maintain the market price of the
Capital Securities above independent market levels. The underwriters are not
required to engage in these activities, and may end any of these activities at
any time.
 
    From time to time, certain underwriters and their affiliates have engaged
in, and may in the future engage in commercial banking and investment banking
transactions with UNBC and its affiliates.
 
                                 LEGAL MATTERS
 
    The validity of the Junior Subordinated Debentures and the Guarantee offered
hereby will be passed upon for UNBC by Skadden, Arps, Slate, Meagher & Flom LLP,
Los Angeles, California. Certain legal matters will be passed upon for the
underwriters by Davis Polk & Wardwell, New York, New York. Certain matters of
Delaware law relating to the validity of the Capital Securities, the enforce
ability of the Trust Declaration and the creation of Finance Trust I will be
passed upon by Skadden, Arps, Slate, Meagher & Flom LLP, Los Angeles,
California.
 
                                     S-109
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                                                             PAGE
                                                                                                           ---------
<S>                                                                                                        <C>
Consolidated Statements of Income for the Years Ended December 31, 1995, 1996 and 1997 and for the Nine
  Months Ended September 30, 1997 (unaudited) and 1998 (unaudited).......................................        F-2
 
Consolidated Balance Sheets as of December 31, 1996 and 1997 and September 30, 1998 (unaudited)..........        F-3
 
Consolidated Statements of Changes in Shareholders' Equity for the Years Ended December 31, 1995, 1996
  and 1997 and for the Nine Months Ended September 30, 1998 (unaudited)..................................        F-4
 
Consolidated Statements of Cash Flows for the Years Ended December 31, 1995, 1996 and 1997 and for the
  Nine Months Ended September 30, 1997 (unaudited) and 1998 (unaudited)..................................        F-5
 
Notes to Consolidated Financial Statements...............................................................        F-6
 
Independent Auditors' Reports............................................................................       F-50
</TABLE>
 
                                      F-1
<PAGE>
                            UNIONBANCAL CORPORATION
 
                       CONSOLIDATED STATEMENTS OF INCOME
 
<TABLE>
<CAPTION>
                                                                                               FOR THE NINE MONTHS
                                                                YEARS ENDED DECEMBER 31,       ENDED SEPTEMBER 30,
                                                             -------------------------------  ----------------------
(AMOUNTS IN THOUSANDS, EXCEPT PER SHARE DATA)                  1995       1996       1997        1997        1998
- -----------------------------------------------------------  ---------  ---------  ---------  -----------  ---------
                                                                                                   (UNAUDITED)
<S>                                                          <C>        <C>        <C>        <C>          <C>
INTEREST INCOME
Loans......................................................  $1,613,376 $1,687,977 $1,763,277  $1,311,337  $1,365,285
Securities.................................................    132,802    143,412    167,440     123,075     145,390
Interest bearing deposits in banks.........................     58,201     52,709     56,748      43,404      14,187
Federal funds sold and securities purchased under resale
  agreements...............................................     22,247     30,246     26,079      18,727      11,784
Trading account assets.....................................     20,567     12,960     19,917      13,388      19,976
                                                             ---------  ---------  ---------  -----------  ---------
    Total interest income..................................  1,847,193  1,927,304  2,033,461   1,509,931   1,556,622
                                                             ---------  ---------  ---------  -----------  ---------
INTEREST EXPENSE
Domestic deposits..........................................    358,049    460,130    520,583     386,699     353,283
Foreign deposits...........................................     96,109     71,437     75,398      55,156      66,455
Federal funds purchased and securities sold under
  repurchase agreements....................................     78,908     47,095     58,544      44,053      59,667
Commercial paper...........................................     86,695     87,411     89,912      66,543      67,719
Subordinated capital notes.................................     42,538     30,104     22,850      17,180      15,883
Other borrowed funds.......................................     42,561     62,549     34,492      26,999      13,976
                                                             ---------  ---------  ---------  -----------  ---------
    Total interest expense.................................    704,860    758,726    801,779     596,630     576,983
                                                             ---------  ---------  ---------  -----------  ---------
NET INTEREST INCOME........................................  1,142,333  1,168,578  1,231,682     913,301     979,639
Provision for credit losses................................     53,250     40,000     --          --          45,000
                                                             ---------  ---------  ---------  -----------  ---------
    Net interest income after provision for credit
     losses................................................  1,089,083  1,128,578  1,231,682     913,301     934,639
                                                             ---------  ---------  ---------  -----------  ---------
NONINTEREST INCOME
Service charges on deposit accounts........................     95,177    101,975    114,647      84,699     101,288
Trust and investment management fees.......................     87,743     93,479    107,527      76,737      88,806
International commissions and fees.........................     68,621     66,108     66,122      49,593      54,516
Merchant transaction processing fees.......................     45,767     49,778     57,128      42,653      42,988
Merchant banking fees......................................     24,483     23,929     24,924      19,899      24,083
Securities gains (losses), net.............................       (702)     4,502      2,711       2,098       5,579
Other......................................................     74,230     78,905     89,942      66,948      82,689
                                                             ---------  ---------  ---------  -----------  ---------
    Total noninterest income...............................    395,319    418,676    463,001     342,627     399,949
                                                             ---------  ---------  ---------  -----------  ---------
NONINTEREST EXPENSE
Salaries and employee benefits.............................    536,671    557,247    571,644     418,970     459,592
Net occupancy..............................................     92,863    103,335     85,630      64,133      67,294
Equipment..................................................     55,056     55,942     56,137      41,206      41,842
Foreclosed asset expense (income)..........................     (3,213)     2,889     (1,268)       (696)       (746)
Merger and integration.....................................     --        117,464      6,037       6,037      --
Other......................................................    296,724    298,027    326,485     232,558     268,196
                                                             ---------  ---------  ---------  -----------  ---------
    Total noninterest expense..............................    978,101  1,134,904  1,044,665     762,208     836,178
                                                             ---------  ---------  ---------  -----------  ---------
Income before income taxes.................................    506,301    412,350    650,018     493,720     498,410
Income tax expense.........................................    193,359    162,892    238,722     174,869     146,045
                                                             ---------  ---------  ---------  -----------  ---------
NET INCOME.................................................  $ 312,942  $ 249,458  $ 411,296   $ 318,851   $ 352,365
                                                             ---------  ---------  ---------  -----------  ---------
                                                             ---------  ---------  ---------  -----------  ---------
NET INCOME APPLICABLE TO COMMON STOCK......................  $ 301,637  $ 238,152  $ 403,696   $ 311,251   $ 352,365
                                                             ---------  ---------  ---------  -----------  ---------
                                                             ---------  ---------  ---------  -----------  ---------
NET INCOME PER COMMON SHARE -- BASIC(1)....................  $    1.74  $    1.37  $    2.31   $    1.78   $    2.01
                                                             ---------  ---------  ---------  -----------  ---------
                                                             ---------  ---------  ---------  -----------  ---------
NET INCOME PER COMMON SHARE -- DILUTED(1)..................  $    1.73  $    1.36  $    2.30   $    1.78   $    2.01
                                                             ---------  ---------  ---------  -----------  ---------
                                                             ---------  ---------  ---------  -----------  ---------
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING -- BASIC(1).....    173,806    174,391    174,683     174,615     175,091
                                                             ---------  ---------  ---------  -----------  ---------
                                                             ---------  ---------  ---------  -----------  ---------
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING -- DILUTED(1)...    174,099    174,784    175,189     175,071     175,729
                                                             ---------  ---------  ---------  -----------  ---------
                                                             ---------  ---------  ---------  -----------  ---------
</TABLE>
 
- ------------------------------
 
(1) Amounts restated to give retroactive effect to the stock split referred to
    in Note 1 of the accompanying notes to Consolidated Financial Statements.
 
See accompanying notes to consolidated financial statements.
 
                                      F-2
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
                          CONSOLIDATED BALANCE SHEETS
 
<TABLE>
<CAPTION>
                                                                                DECEMBER 31,
                                                                           ----------------------
(DOLLARS IN THOUSANDS, EXCEPT SHARE DATA)                                     1996        1997
- -------------------------------------------------------------------------  ----------  ----------  SEPTEMBER 30,
                                                                                                       1998
                                                                                                   -------------
                                                                                                    (UNAUDITED)
<S>                                                                        <C>         <C>         <C>
ASSETS
Cash and due from banks..................................................  $2,268,771  $2,541,699   $ 2,211,595
Interest bearing deposits in banks.......................................   1,131,216     633,421       133,165
Federal funds sold and securities purchased under resale agreements......     537,710      24,335       629,784
                                                                           ----------  ----------  -------------
    Total cash and cash equivalents......................................   3,937,697   3,199,455     2,974,544
Trading account assets...................................................     465,782     394,313       357,515
Securities available for sale............................................   2,164,197   2,538,386     3,200,376
Securities held to maturity (fair value: December 31, 1996, $274,405;
  December 31, 1997, $193,115; September 30, 1998, $165,807
  (unaudited))...........................................................     268,196     188,775       162,018
Loans (net of allowance for credit losses: December 31, 1996, $523,946;
  December 31, 1997, $451,692; September 30, 1998, $473,717
  (unaudited))...........................................................  20,525,841  22,289,716    23,024,128
Due from customers on acceptances........................................     778,378     773,339       464,581
Premises and equipment, net..............................................     410,621     406,299       407,863
Other assets.............................................................     683,347     794,982       816,293
                                                                           ----------  ----------  -------------
    Total assets.........................................................  $29,234,059 $30,585,265  $31,407,318
                                                                           ----------  ----------  -------------
                                                                           ----------  ----------  -------------
 
LIABILITIES
Domestic deposits:
  Noninterest bearing....................................................  $7,381,078  $8,574,515   $ 9,427,080
  Interest bearing.......................................................  12,607,691  12,666,458    12,379,167
Foreign deposits:
  Noninterest bearing....................................................     274,031     275,029       247,038
  Interest bearing.......................................................   1,270,160   1,780,372     1,609,844
                                                                           ----------  ----------  -------------
    Total deposits.......................................................  21,532,960  23,296,374    23,663,129
Federal funds purchased and securities sold under repurchase
  agreements.............................................................   1,322,654   1,335,884     1,574,163
Commercial paper.........................................................   1,495,463     966,575     1,417,077
Other borrowed funds.....................................................     749,422     476,010       339,340
Acceptances outstanding..................................................     778,378     773,339       464,581
Other liabilities........................................................     478,249     709,784       666,078
Subordinated capital notes...............................................     382,000     348,000       298,000
                                                                           ----------  ----------  -------------
    Total liabilities....................................................  26,739,126  27,905,966    28,422,368
                                                                           ----------  ----------  -------------
Commitments and contingencies
 
SHAREHOLDERS' EQUITY
  Preferred stock:
    Authorized 5,000,000 shares 8 3/8% Noncumulative, Series A, issued
     1,350,000 shares in 1996............................................     135,000      --           --
  Common stock(1)--$5 stated value:
    Authorized 300,000,000 shares, issued 174,457,602 shares as of
     December 31, 1996, 174,917,673 shares as of December 31, 1997 and
     175,208,037 shares as of September 30, 1998 (unaudited).............     290,762     291,529       292,013
  Additional paid-in capital.............................................   1,413,076   1,422,680     1,430,539
  Retained earnings......................................................     645,214     957,662     1,233,068
  Accumulated other comprehensive income.................................      10,881       7,428        29,330
                                                                           ----------  ----------  -------------
    Total shareholders' equity...........................................   2,494,933   2,679,299     2,984,950
                                                                           ----------  ----------  -------------
    Total liabilities and shareholders' equity...........................  $29,234,059 $30,585,265  $31,407,318
                                                                           ----------  ----------  -------------
                                                                           ----------  ----------  -------------
</TABLE>
 
- ------------------------------
 
(1) Amounts restated to give retroactive effect to the stock split referred to
    in Note 1 of the accompanying notes to Consolidated Financial Statements.
 
See accompanying notes to consolidated financial statements.
 
                                      F-3
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
           CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY
 
<TABLE>
<CAPTION>
                                                                    YEARS ENDED DECEMBER 31,
                                                                 -------------------------------
(DOLLARS IN THOUSANDS)                                             1995       1996       1997
- ---------------------------------------------------------------  ---------  ---------  ---------  FOR THE NINE
                                                                                                  MONTHS ENDED
                                                                                                  SEPTEMBER 30,
                                                                                                      1998
                                                                                                  -------------
                                                                                                   (UNAUDITED)
<S>                                                              <C>        <C>        <C>        <C>
PREFERRED STOCK
Balance, beginning of period...................................  $ 135,000  $ 135,000  $ 135,000   $   --
Redemption of preferred stock..................................     --         --       (135,000)      --
                                                                 ---------  ---------  ---------  -------------
  Balance, end of period.......................................  $ 135,000  $ 135,000  $  --       $   --
                                                                 ---------  ---------  ---------  -------------
COMMON STOCK
Balance, beginning of period...................................  $ 286,739  $ 290,300  $ 290,762   $   291,529
Dividend reinvestment plan.....................................      3,103        121          6             6
Deferred compensation -- restricted stock awards...............        379        207        279           281
Stock options exercised........................................         79        134        482           197
                                                                 ---------  ---------  ---------  -------------
  Balance, end of period.......................................  $ 290,300  $ 290,762  $ 291,529   $   292,013
                                                                 ---------  ---------  ---------  -------------
ADDITIONAL PAID-IN CAPITAL
Balance, beginning of period...................................  $1,390,925 $1,408,960 $1,413,076  $ 1,422,680
Dividend reinvestment plan.....................................     15,238      1,041        (43)           10
Deferred compensation -- restricted stock awards...............      2,268      2,148      3,478         5,217
Stock options exercised........................................        529        927      6,169         2,632
                                                                 ---------  ---------  ---------  -------------
  Balance, end of period.......................................  $1,408,960 $1,413,076 $1,422,680  $ 1,430,539
                                                                 ---------  ---------  ---------  -------------
RETAINED EARNINGS
Balance, beginning of period...................................  $ 376,468  $ 626,172  $ 645,214   $   957,662
Net income(1)..................................................    312,942    249,458    411,296       352,365
Dividends on common stock(2)(3)................................    (50,989)   (73,932)   (89,848)      (73,632)
Dividends on preferred stock...................................    (11,305)   (11,306)    (7,600)      --
Dividend to MBL................................................     --       (144,890)    --           --
Deferred compensation -- restricted stock awards...............       (944)      (288)    (1,400)       (3,327)
                                                                 ---------  ---------  ---------  -------------
Balance, end of period.........................................  $ 626,172  $ 645,214  $ 957,662   $ 1,233,068
                                                                 ---------  ---------  ---------  -------------
ACCUMULATED OTHER COMPREHENSIVE INCOME
Balance, beginning of period...................................  $  (9,930) $  23,660  $  10,881   $     7,428
                                                                 ---------  ---------  ---------  -------------
Net income(1)..................................................    312,942    249,458    411,296       352,365
Other comprehensive income.....................................     33,590    (12,779)    (3,453)       21,902
                                                                 ---------  ---------  ---------  -------------
Total comprehensive income.....................................    346,532    236,679    407,843       374,267
Less: net income included in retained earnings.................   (312,942)  (249,458)  (411,296)     (352,365)
                                                                 ---------  ---------  ---------  -------------
  Balance, end of period.......................................  $  23,660  $  10,881  $   7,428   $    29,330
                                                                 ---------  ---------  ---------  -------------
    TOTAL SHAREHOLDERS' EQUITY.................................  $2,484,092 $2,494,933 $2,679,299  $ 2,984,950
                                                                 ---------  ---------  ---------  -------------
                                                                 ---------  ---------  ---------  -------------
</TABLE>
 
- ------------------------------
 
(1) Includes dividends applicable to preferred shareholders of $11.3 million for
    the years ended December 31, 1995 and 1996, respectively, and $7.6 million
    for the year ended December 31, 1997.
 
(2) Dividends per share in 1996 were based on historical Union Bank common cash
    dividends declared and did not include the $145 million dividend paid to The
    Mitsubishi Bank, Limited (MBL) in the first quarter of 1996 by BanCal
    Tri-State Corporation and The Bank of California, N.A.
 
(3) Dividends per share, after giving effect to the stock split referred to in
    Note 1 of the accompanying notes to Consolidated Financial Statements, were
    $0.47 in 1995 and 1996, respectively, $0.51 in 1997, and $0.42 for the nine
    months ended September 30, 1998, (unaudited) and are based on the Company's
    shares outstanding as of the declaration date.
 
See accompanying notes to consolidated financial statements.
 
                                      F-4
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                                                                     FOR THE NINE MONTHS
                                                                    YEARS ENDED DECEMBER 31,         ENDED SEPTEMBER 30,
                                                                ---------------------------------  -----------------------
(DOLLARS IN THOUSANDS)                                             1995       1996        1997        1997         1998
- --------------------------------------------------------------  ----------  ---------  ----------  -----------  ----------
                                                                                                         (UNAUDITED)
<S>                                                             <C>         <C>        <C>         <C>          <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net income..................................................  $  312,942  $ 249,458  $  411,296   $ 318,851   $  352,365
  Adjustments to reconcile net income to net cash provided by
   operating activities:
    Provision for credit losses...............................      53,250     40,000      --          --           45,000
    Depreciation, amortization and accretion..................      61,767     65,092      65,469      49,285       50,528
    Provision for deferred income taxes.......................      50,841     50,658      59,814      38,734       16,018
    (Gain) loss on sales of securities available for sale.....         801     (4,502)     (2,711)     (2,098)      (5,579)
    Merger and integration costs in excess of (less than) cash
     utilized.................................................      --         54,344     (31,414)    (27,200)     (12,350)
    Net (increase) decrease in trading account assets.........      82,541   (359,234)     52,743     (37,045)      36,798
    Other, net................................................     157,244     52,101     173,706      92,393      (33,448)
                                                                ----------  ---------  ----------  -----------  ----------
    Total adjustments.........................................     406,444   (101,541)    317,607     114,069       96,967
                                                                ----------  ---------  ----------  -----------  ----------
  Net cash provided by operating activities...................     719,386    147,917     728,903     432,920      449,332
                                                                ----------  ---------  ----------  -----------  ----------
CASH FLOWS FROM INVESTING ACTIVITIES:
  Proceeds from sales of securities available for sale........     240,731     19,536     171,629       3,920      418,456
  Proceeds from matured and called securities available for
   sale.......................................................     764,853    757,463     587,034     326,833      196,358
  Purchase of securities available for sale...................  (1,452,339)  (995,479) (1,112,080)   (777,281)  (1,253,529)
  Proceeds from matured and called securities held to
   maturity...................................................     213,337     95,829      79,828      36,121       26,960
  Purchase of securities held to maturity.....................    (123,886)    --          --          --           --
  Net increase in loans.......................................  (2,478,608)  (741,335) (1,788,179) (1,315,578)    (797,343)
  Other, net..................................................     (34,902)   (54,120)    (56,584)    (19,986)     (42,032)
                                                                ----------  ---------  ----------  -----------  ----------
    Net cash used by investing activities.....................  (2,870,814)  (918,106) (2,118,352) (1,745,971)  (1,451,130)
                                                                ----------  ---------  ----------  -----------  ----------
CASH FLOWS FROM FINANCING ACTIVITIES:
  Net increase in deposits....................................   2,245,306  1,877,917   1,763,414   1,441,228      366,755
  Net increase (decrease) in federal funds purchased and
   securities sold under repurchase agreements................    (287,387)   127,596      13,230     (27,711)     238,279
  Net increase (decrease) in commercial paper and other
   borrowed funds.............................................     623,612   (201,214)   (797,464)     94,601      313,832
  Maturity and redemption of subordinated debt................    (154,490)  (119,369)   (234,000)   (200,000)     (50,000)
  Proceeds from issuance of subordinated debt.................      --         --         200,000     200,000       --
  Payments of cash dividends..................................     (62,044)  (222,533)    (93,303)    (68,787)     (73,631)
  Redemption of preferred stock...............................      --         --        (135,000)   (135,000)      --
  Repayment of borrowing to support corporate owned life
   insurance..................................................     (10,638)   (95,475)     --          --           --
  Other, net..................................................         485       (882)     (2,661)      2,642        2,471
                                                                ----------  ---------  ----------  -----------  ----------
    Net cash provided by financing activities.................   2,354,844  1,366,040     714,216   1,306,973      797,706
                                                                ----------  ---------  ----------  -----------  ----------
Net increase (decrease) in cash and cash equivalents..........     203,416    595,851    (675,233)     (6,078)    (204,092)
Cash and cash equivalents at beginning of period..............   3,153,713  3,352,423   3,937,697   3,937,697    3,199,455
Effect of exchange rate changes on cash and cash
  equivalents.................................................      (4,706)   (10,577)    (63,009)    (16,910)     (20,819)
                                                                ----------  ---------  ----------  -----------  ----------
Cash and cash equivalents at end of period....................  $3,352,423  $3,937,697 $3,199,455   $3,914,709  $2,974,544
                                                                ----------  ---------  ----------  -----------  ----------
                                                                ----------  ---------  ----------  -----------  ----------
CASH PAID DURING THE PERIOD FOR:
  Interest....................................................  $  739,300  $ 764,327  $  820,355   $ 611,347   $  588,487
  Income taxes................................................      91,717    172,451     113,588      47,359      189,411
SUPPLEMENTAL SCHEDULE OF NONCASH INVESTING AND FINANCING
  ACTIVITIES:
  Loans transferred to foreclosed assets (OREO)...............  $   48,397  $  44,557  $   23,114   $  19,033   $   13,882
  Securities transferred from held to maturity to available
   for sale...................................................     348,717     --          --          --           --
  Dividends declared but unpaid...............................      12,788     20,383      24,528      24,518       24,529
</TABLE>
 
See accompanying notes to consolidated financial statements.
 
                                      F-5
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
                         DECEMBER 31, 1995, 1996, 1997,
 
                            AND CONDENSED NOTES FOR
 
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 1 -- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND NATURE OF OPERATIONS
 
    UnionBanCal Corporation (a commercial bank holding company and subsidiaries)
(the Company) is 82 percent owned by The Bank of Tokyo-Mitsubishi, Ltd. (BTM)
and 18 percent owned by other shareholders.
 
    On April 1, 1996, the Company was created by the combination of Union Bank
with BanCal Tri-State Corporation and its banking subsidiary, The Bank of
California, N.A. The combination was accounted for as a reorganization of
entities under common control (similar to a business combination under the
pooling of interests method). Accordingly, all historical financial information
has been restated as if the combination had been in effect for all periods
presented. The merger was effected by the issuance of 54,402,081 shares of Union
Bank common stock in exchange for all the outstanding common shares of BanCal
Tri-State Corporation. Information pretaining to merger and intergration expense
is presented in Note 7.
 
    On August 10, 1998, the Company exchanged 10.2 million shares of its common
stock for 7.2 million shares of Union Bank of California, N.A. (the Bank) common
stock owned directly by BTM. This share exchange provided the Company with a 100
percent ownership interest in the Bank. In addition, it increased BTM's
ownership percentage of the Company to 82 percent from 81 percent.
 
    The exchange of shares was accounted for as a reorganization of entities
under common control. Accordingly, amounts previously reported as Parent Direct
Interest in Bank Subsidiary, including the proportionate share of net income,
dividends, and other comprehensive income have been reclassified to combine them
with the corresponding amounts attributable to the Company's common shareholders
for all periods presented.
 
    On November 18, 1998, the Board of Directors approved the declaration of a
3-for-1 stock split effective for shareholders of record on December 7, 1998.
Accordingly, all historical financial information has been restated as if the
stock split had been in effect for all periods presented.
 
    The Company provides a wide range of financial services to consumers, small
businesses, middle market companies and major corporations, primarily in
California, Oregon and Washington, but also nationally and internationally.
 
    BASIS OF FINANCIAL STATEMENT PRESENTATION
 
    The accounting and reporting policies of the Company conform to generally
accepted accounting principles (GAAP) and general practice within the banking
industry. Those policies that materially affect the determination of financial
position, results of operations, and cash flows are summarized below.
 
    The Consolidated Financial Statements include the accounts of the Company.
All material intercompany transactions and balances have been eliminated. The
preparation of financial statements in conformity with GAAP requires management
to make estimates and assumptions that affect the reported amounts of assets and
liabilities and disclosure of contingent assets and liabilities at the date of
the financial statements and the reported amounts of revenues and expenses
during the reporting period. Actual results could differ from those estimates.
Certain amounts for prior periods have been reclassified to conform with current
financial statement presentation.
 
                                      F-6
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
 
                            AND CONDENSED NOTES FOR
 
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 1 -- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND NATURE OF OPERATIONS
         (CONTINUED)
    The unaudited consolidated financial statements of UnionBanCal Corporation
and subsidiaries (the Company) as of September 30, 1997 and 1998 have been
prepared in accordance with generally accepted accounting principles (GAAP) for
interim financial reporting. However, they do not include all of the disclosures
necessary for annual financial statements in conformity with GAAP.
 
    CASH AND CASH EQUIVALENTS
 
    For purposes of reporting cash flows, cash and cash equivalents include cash
and due from banks, interest bearing deposits in banks and federal funds sold
and securities purchased under resale agreements, substantially all of which
have maturities less than 90 days.
 
    TRADING ACCOUNT ASSETS
 
    Trading account assets are those financial instruments that management
acquires with the intent to hold for short periods of time in order to take
advantage of anticipated changes in market values. Substantially all of these
assets are securities with a high degree of liquidity and a readily determinable
market value. Interest earned, paid, or accrued on trading account assets is
included in interest income using a method that generally produces a level
yield. Realized gains and losses from the close out of trading account positions
and unrealized market value adjustments are recognized in noninterest income.
 
    SECURITIES AVAILABLE FOR SALE AND SECURITIES HELD TO MATURITY
 
    The Company's securities portfolios consist of debt and equity securities
that are classified either as securities available for sale or securities held
to maturity.
 
    Debt securities for which the Company has the positive intent and ability to
hold until maturity are classified as securities held to maturity and carried at
amortized cost.
 
    Debt securities and equity securities with readily determinable market
values that are not classified as either held to maturity securities or trading
account assets are classified as securities available for sale and carried at
fair value, with the unrealized gains or losses reported net of taxes as a
separate component of shareholders' equity until realized.
 
    Realized gains and losses arising from the sale of securities are based upon
the specific identification method and included in noninterest income as
securities gains (losses), net.
 
    Interest income on debt securities includes the amortization of premiums and
the accretion of discounts using the effective interest method and is included
in interest income on securities. Dividend income on equity securities is
included in noninterest income.
 
    LOANS
 
    Loans are reported at the principal amounts outstanding, net of unamortized
nonrefundable loan fees and related direct loan origination costs. Deferred net
fees and costs are recognized in interest income over
 
                                      F-7
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
 
                            AND CONDENSED NOTES FOR
 
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 1 -- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND NATURE OF OPERATIONS
         (CONTINUED)
the loan term using a method that generally produces a level yield on the unpaid
loan balance. Nonrefundable fees and direct loan origination costs related to
loans held for sale are deferred and recognized as a component of the gain or
loss on sale. Interest income is accrued principally on a simple interest basis.
 
    Nonaccrual loans are those for which management has discontinued accrual of
interest because there exists significant uncertainty as to the full and timely
collection of either principal or interest or such loans have become
contractually past due 90 days with respect to principal or interest.
 
    Interest accruals are continued for certain small business loans that are
processed centrally, consumer loans, credit cards, and one-to-four family
residential real estate loans. These loans are charged off or written down to
their net realizable value based on delinquency time frames that range from 120
to 270 days, depending on the type of credit that has been extended. Interest
accruals are also continued for loans that are both well-secured and in the
process of collection. For this purpose, loans are considered well-secured if
they are collateralized by property having a net realizable value in excess of
the amount of principal and accrued interest outstanding or are guaranteed by a
financially responsible and willing party. Loans are considered "in the process
of collection" if collection is proceeding in due course either through legal
action or other actions that are reasonably expected to result in the prompt
repayment of the debt or in its restoration to current status.
 
    When a loan is placed on nonaccrual, all previously accrued but uncollected
interest is reversed against current period operating results. All subsequent
payments received are first applied to unpaid principal and then to uncollected
interest. Interest income is accrued at such time as the loan is brought fully
current as to both principal and interest, and, in management's judgment, such
loans are considered to be fully collectible. However, Company policy also
allows management to continue the recognition of interest income on certain
loans designated as nonaccrual. This portion of the nonaccrual portfolio is
referred to as "Cash Basis Nonaccrual" loans. This policy only applies to loans
that are well secured and in management's judgment are considered to be fully
collectible. Although the accrual of interest is suspended, any payments
received may be applied to the loan according to its contractual terms and
interest income recognized when cash is received.
 
    Loans are considered impaired when, based on current information, it is
probable that the Company will be unable to collect all amounts due according to
the contractual terms of the loan agreement, including interest payments.
Impaired loans are carried at the lower of the recorded investment in the loan,
the estimated present value of total expected future cash flows, discounted at
the loan's effective rate, or the fair value of the collateral, if the loan is
collateral dependent. Additionally, some impaired loans with commitments of less
than $1 million are aggregated for the purpose of measuring impairment using
historical loss factors as a means of measurement. Excluded from the impairment
analysis are large groups of smaller balance homogeneous loans such as consumer
and residential mortgage loans.
 
    Renegotiated loans are those in which the Company has formally restructured
a significant portion of the loan. The remaining portion is normally charged
off, with a concession either in the form of below market rate financing, or
debt forgiveness on the charged off portion. Loans that have been renegotiated
and
 
                                      F-8
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
 
                            AND CONDENSED NOTES FOR
 
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 1 -- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND NATURE OF OPERATIONS
         (CONTINUED)
have not met specific performance standards for payment are classified as
renegotiated loans within the classification of nonperforming assets. Upon
payment performance, such loans may be transferred from nonperforming status to
accrual status.
 
    The Company offers primarily two types of leases to customers: 1) direct
financing leases where the assets leased are acquired without additional
financing from other sources, and 2) leveraged leases where a substantial
portion of the financing is provided by debt with no recourse to the Company.
Direct financing leases are carried net of unearned income, unamortized
nonrefundable fees and related direct costs associated with the origination or
purchase of leases. Leveraged leases are carried net of nonrecourse debt.
 
    ALLOWANCE FOR CREDIT LOSSES
 
    The Company's allowance for credit losses is maintained at a level
considered by management to be adequate to absorb estimated credit losses and
other credit-related charges. The allowance for credit losses is increased by
the provision for credit losses, which is charged against current period
operating results and decreased by the amount of credit losses, net of
recoveries. Losses are fully or partially charged against the allowance for
credit losses when, in management's judgment, the uncollectible portion of a
loan's principal balance is determined. While management has segmented the
allowance to various credit-related products, the allowance is general in nature
and is available for all extension of credits, including off-balance sheet
instruments.
 
    In evaluating the adequacy of the allowance for credit losses, management
estimates the amount of the potential risk of loss for each loan that has been
identified as having more than standard credit risk. Those estimates give
consideration to general economic conditions and their effects on the borrower's
industry, financial and management abilities and to current valuations of
collateral where appropriate. An estimate for potential credit loss content is
calculated for all loans not so identified based upon the risk characteristics
of particular categories of loans and historical loss experience in the
portfolio, adjusted, as appropriate, for the estimated effects of current
economic conditions. Further consideration for the allocation is based on credit
risk concentrations in the portfolio and commitments and contingent obligations
under off-balance sheet commercial and standby letters of credit. For analytical
purposes only, management attributes portions of the allowance for credit losses
to individual loans or groups of loans. Although the allowance for credit losses
is allocated to various portfolio segments, it is general in nature and is
available for the loan portfolio in its entirety. Although management believes
that the allowance for possible credit losses is adequate, future provisions
will be subject to continuing evaluation of inherent risk in the loan portfolio
and other credit exposures.
 
    A loan is considered impaired when management determines that it is probable
that the Company will be unable to collect all amounts due according to the
original contractual terms of the loan agreement. Impairment is measured by the
difference between the recorded investment in the loan (including accrued
interest, net deferred loan fees or cost and unamortized premium or discount)
and the estimated present
 
                                      F-9
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
 
                            AND CONDENSED NOTES FOR
 
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 1 -- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND NATURE OF OPERATIONS
         (CONTINUED)
value of total expected future cash flows, discounted at the loan's effective
rate, or the fair value of the collateral, if the loan is collateral dependent.
An impairment is recognized by adjusting an allocation of the existing allowance
for credit losses.
 
    PREMISES AND EQUIPMENT
 
    Premises and equipment are carried at cost, less accumulated depreciation
and amortization. Depreciation and amortization are calculated using the
straight-line method over the estimated useful life of each asset. Lives of
premises range from ten to forty years; lives of furniture and equipment range
from three to eight years. Leasehold improvements are amortized over the term of
the respective lease or 10 years, whichever is shorter.
 
    OTHER ASSETS
 
    Goodwill represents the excess of purchase price over the fair value of
identifiable net assets of acquired companies and is reported as intangible
assets. Goodwill is amortized using the straight-line method, generally over 15
years.
 
    Other real estate owned (OREO) represents the collateral acquired through
foreclosure in full or partial satisfaction of the related loan. OREO is
recorded at the lower of the loan's unpaid principal balance or its fair value
as established by a current appraisal, adjusted for disposition costs. Any
write-down at the date of transfer is charged to the allowance for credit
losses. On an ongoing basis, OREO values, recorded in other assets, are reviewed
annually and any decline in value is recognized as foreclosed asset expense in
the current period. The net operating results from these assets are included in
the current period in noninterest expense as foreclosed asset expense (income).
 
    DERIVATIVE INSTRUMENTS HELD FOR TRADING OR CUSTOMER ACCOMMODATION
 
    The Company enters into a variety of interest rate derivative contracts,
primarily swaps and options and foreign exchange contracts, which include spot,
futures, forward, swap and option positions either for trading purposes, based
on management's intent at inception, or as an accommodation to customers.
 
    Derivatives held or issued for trading or customer accommodation are carried
at fair value, with realized and unrealized changes in fair values on contracts
included in noninterest income in the period in which the changes occur.
Unrealized gains and losses are reported gross and included in trading account
assets and other liabilities, respectively. Cash flows are reported net as
operating activities.
 
    DERIVATIVE INSTRUMENTS HELD FOR PURPOSES OTHER THAN TRADING
 
    The Company enters into a variety of derivative contracts as a means of
reducing the Company's interest rate and foreign exchange exposures. At
inception these contracts are evaluated in order to determine if they qualify
for hedge accounting treatment and are accounted for either on a deferral,
accrual or market value basis, depending on the nature of the Company's hedge
strategy and the method used to
 
                                      F-10
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
 
                            AND CONDENSED NOTES FOR
 
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 1 -- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND NATURE OF OPERATIONS
         (CONTINUED)
account for the hedged item. Hedge criteria include demonstrating the manner in
which the hedge will reduce risk, identifying the specific asset, liability or
firm commitment being hedged, and citing the time horizon being hedged. A
monthly evaluation is performed to ensure that continuing correlation exists
between the hedge and the item being hedged.
 
    Net interest settlements on interest rate swap, cap and floor agreements are
recognized on an accrual basis as interest income or expense of the related
asset or liability over the lives of the agreements. Premiums paid or received
for interest rate caps and floors are amortized either to interest income or to
expense of the related asset or liability over the lives of the agreements. If
an agreement is terminated early, any resulting gain or loss is deferred and
amortized as interest income or expense of the related asset or liability over
the remaining life of the original agreement. Net settlement amounts are
reported gross as other assets and other liabilities. Cash flows are reported
net as operating activities.
 
    FOREIGN CURRENCY TRANSLATION
 
    Assets, liabilities and results of operations for foreign branches are
recorded based on the functional currency of each branch. Since the functional
currency of the branches is the local currency, the net assets are re-measured
into U.S. dollars using a combination of current and historical exchange rates.
The resulting gains or losses are included in shareholders' equity, on a net of
tax basis.
 
    TRANSFERS AND SERVICING OF FINANCIAL ASSETS AND EXTINGUISHMENT OF
     LIABILITIES
 
    On January 1, 1997, the Company adopted Statement of Financial Accounting
Standards (SFAS) No. 125, "Accounting for Transfers and Servicing of Financial
Assets and Extinguishments of Liabilities". The Statement establishes standards
for when transfers of financial assets, including those with continuing
involvement by the transferor, should be considered a sale. SFAS No. 125 also
establishes standards for when a liability should be considered extinguished.
This Statement is effective for transfers of assets and extinguishments of
liabilities occurring after December 31, 1996 and has been applied
prospectively. Certain provisions of SFAS No. 125 have been postponed under SFAS
No. 127, "Deferral of the Effective Date of Certain Provisions of FASB Statement
No. 125". SFAS No. 127 deferred for one year the effective date of
implementation for transactions related to repurchase agreements, dollar-roll
repurchase agreements, securities lending and similar transactions. Management
determined that the effect of adoption of SFAS No. 127 on the Company's
financial statements was not material.
 
    INCOME TAXES
 
    The Company files consolidated federal and combined state income tax
returns. Amounts provided for income tax expense are based on income reported
for financial statement purposes and do not necessarily represent amounts
currently payable under tax laws. Deferred taxes, which arise principally from
temporary differences between the period in which certain income and expenses
are recognized for financial accounting
 
                                      F-11
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
 
                            AND CONDENSED NOTES FOR
 
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 1 -- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND NATURE OF OPERATIONS
         (CONTINUED)
purposes and the period in which they affect taxable income, are included in the
amounts provided for income taxes. Under this method, the computation of the net
deferred tax liability or asset gives current recognition to changes in the tax
laws.
 
    NET INCOME PER COMMON SHARE
 
    Basic earnings per share (EPS) is computed by dividing net income after
preferred dividends by the weighted average number of common shares outstanding
during the period. Diluted EPS incorporates the dilutive effect of common stock
equivalents outstanding on an average basis during the period. Stock options
(see Note 12) are a common stock equivalent.
 
    The Company adopted the provisions of SFAS No. 128, "Earnings per Share",
for the year ended December 31, 1997. As required by the provisions of the
Statement, all prior period and interim period EPS data presented have been
restated. This Statement simplifies the standards for computing EPS and makes
them comparable to international EPS standards. SFAS No. 128 replaces the
presentation of primary EPS with a presentation of basic EPS. In addition, all
entities with complex capital structures are required to provide a dual
disclosure of basic and diluted EPS on the face of the income statement and a
reconciliation of the numerator and denominator of the basic EPS computation to
the numerator and denominator of the diluted EPS computation. Also see Note 17.
 
    COMPREHENSIVE INCOME
 
    The Company has retroactively adopted SFAS No. 130, "Reporting Comprehensive
Income", which requires that an enterprise report and display, by major
components and as a single total, the change in its net assets during the period
from non-owner sources. The adoption of this Statement resulted in a change in
the financial statement presentation, but did not have an impact on the
Company's consolidated financial position, results of operations or cash flows.
 
    EMPLOYEE BENEFIT AND INCENTIVE PLANS AND OTHER POSTRETIREMENT BENEFITS
 
    The Company provides a variety of benefit and incentive compensation plans
for eligible employees and retirees. Provisions for the costs of these employee
benefit and incentive plans and postretirement benefit plans are accrued and
charged to expense when the benefit is earned.
 
    STOCK-BASED COMPENSATION
 
    The Company adopted the disclosure provisions of SFAS No. 123, "Accounting
for Stock-Based Compensation", on January 1, 1996. SFAS No. 123 establishes
accounting and disclosure requirements using a fair value-based method of
accounting for stock-based compensation plans.
 
    As allowed under the provisions of SFAS No. 123, the Company has chosen to
continue to recognize compensation expense using the intrinsic value-based
method of valuing stock options prescribed in Accounting Principles Board
Opinion No. 25, "Accounting for Stock Issued to Employees" and related
 
                                      F-12
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
 
                            AND CONDENSED NOTES FOR
 
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 1 -- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND NATURE OF OPERATIONS
         (CONTINUED)
Interpretations. Under the intrinsic value-based method, compensation cost is
measured as the amount by which the quoted market price of the Company's stock
at the date of grant exceeds the stock option exercise price.
 
    Compensation cost associated with the Company's unvested restricted stock
issued under the management stock plan is measured based on the market price of
the stock at the grant date and is expensed over the vesting period.
 
    RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS
 
    In June 1997, the Financial Accounting Standards Board (FASB) issued SFAS
No. 131, "Disclosures about Segments of an Enterprise and Related Information",
which establishes annual and interim reporting standards for an enterprise's
operating segments and related disclosures about its products, services,
geographic areas, and major customers. Adoption of this Statement will not
impact the Company's consolidated financial position, results of operations, or
cash flows, and any effect will be limited to the form and content of its
disclosures. The Statement is effective with the year-end 1998 financial
statements.
 
    In February 1998, the FASB issued SFAS No. 132, "Employers' Disclosures
about Pensions and Other Postretirement Benefits". The Standard revises the
disclosure requirements for pensions and other postretirement benefits. This
Statement is effective for fiscal years beginning after December 15, 1997.
Adoption of this Statement will not impact the consolidated financial position,
results of operations, or cash flows, and any effect is limited to the form and
content of its disclosures.
 
    In June 1998, the FASB issued SFAS No. 133, "Accounting for Derivative
Instruments and Hedging Activities". The Statement will require the Company to
recognize all derivatives on the balance sheet at fair value. SFAS No. 133
requires that derivative instruments used to hedge be identified specifically to
assets, liabilities, firm commitments or anticipated transactions and measured
as effective and ineffective when hedging changes in fair value or cash flows.
Derivative instruments that do not qualify as either a fair value or cash flow
hedge will be valued at fair value with the resultant gain or loss recognized in
current earnings. Changes in the effective portion of fair value hedges will be
recognized in current earnings along with the change in fair value of the hedged
item. Changes in the effective portion of the fair value of cash flow hedges
will be recognized in other comprehensive income until realization of the cash
flows of the hedged item through current earnings. Any ineffective portion of
hedges will be recognized in current earnings. Management believes that,
depending upon the accumulated net gain or loss of the effective portion of cash
flow hedges at the date of adoption, the impact of SFAS No. 133 could have a
material impact on other comprehensive income. However, Management believes that
any ineffective portion of cash flow hedges or any other hedges will not have a
material impact on the Company's financial position or results of operations.
This Statement is effective for fiscal years beginning after June 15, 1999, with
earlier application encouraged. The Company expects to adopt SFAS No. 133 as of
January 1, 2000.
 
    In October 1998, the FASB issued SFAS No. 134, "Accounting for
Mortgage-Backed Securities Retained after the Securitization of Mortgage Loans
Held for Sale by a Mortgage Banking Enterprise". This Statement amends SFAS No.
65, "Accounting for Certain Mortgage Banking Activities", which established
 
                                      F-13
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
 
                            AND CONDENSED NOTES FOR
 
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 1 -- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND NATURE OF OPERATIONS
         (CONTINUED)
accounting and reporting standards for certain activities of mortgage banking
and other similar enterprises. After securitization of mortgage loans held for
sale, SFAS No. 134 requires an entity to classify the resulting mortgage-backed
securities or other retained interests, based on its ability or intent to sell
or hold those investments. Management believes that the adoption of SFAS No. 134
will have no impact on the Company's financial position or results of
operations. This Statement is effective for fiscal years beginning after
December 15, 1998, with earlier application permitted. The Company expects to
adopt SFAS No. 134 on January 1, 1999.
 
    In March 1998, the American Institute of Certified Public Accountants
(AICPA) issued Statement of Position (SOP) 98-1, "Accounting for the Costs of
Computer Software Developed or Obtained for Internal Use". SOP 98-1 requires the
capitalization of eligible costs of specified activities related to computer
software developed or obtained for internal use. Management believes that the
adoption of SOP 98-1 will not have a material effect on the Company's financial
position or results of operations. The Statement is effective for fiscal years
beginning after December 15, 1998, with earlier adoption encouraged. The Company
expects to adopt SOP 98-1 on January 1, 1999.
 
    In June 1998, the AICPA issued SOP 98-5, "Reporting on the Costs of Start-Up
Activities". SOP 98-5 requires that entities expense start-up costs and
organization costs as they are incurred. Management believes that the adoption
of SOP 98-5 will not have a material effect on the Company's financial position
or results of operations. The Statement is effective for fiscal years beginning
after December 15, 1998, with earlier adoption encouraged. The Company expects
to adopt SOP 98-5 on January 1, 1999.
 
NOTE 2 -- SECURITIES
 
    The amortized cost, gross unrealized gains, gross unrealized losses, and
fair values of securities are presented below.
 
SECURITIES AVAILABLE FOR SALE
 
<TABLE>
<CAPTION>
                                                                                DECEMBER 31, 1996
                                                               ----------------------------------------------------
                                                                                GROSS        GROSS
                                                                AMORTIZED    UNREALIZED   UNREALIZED
(DOLLARS IN THOUSANDS)                                             COST         GAINS       LOSSES      FAIR VALUE
- -------------------------------------------------------------  ------------  -----------  -----------  ------------
<S>                                                            <C>           <C>          <C>          <C>
U.S. Treasury................................................  $  1,137,992   $   4,993    $   1,933   $  1,141,052
Other U.S. government........................................       687,717       4,993          779        691,931
Mortgage-backed securities...................................       193,531         400          274        193,657
State and municipal..........................................       101,006      13,749       --            114,755
Corporate debt securities....................................       --           --           --            --
Equity securities............................................        19,041       2,553       --             21,594
Foreign securities...........................................         1,136          72       --              1,208
                                                               ------------  -----------  -----------  ------------
    Total securities available for sale......................  $  2,140,423   $  26,760    $   2,986   $  2,164,197
                                                               ------------  -----------  -----------  ------------
                                                               ------------  -----------  -----------  ------------
</TABLE>
 
                                      F-14
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
 
                            AND CONDENSED NOTES FOR
 
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 2 -- SECURITIES (CONTINUED)
<TABLE>
<CAPTION>
                                                                                DECEMBER 31, 1997
                                                               ----------------------------------------------------
                                                                                GROSS        GROSS
                                                                AMORTIZED    UNREALIZED   UNREALIZED
(DOLLARS IN THOUSANDS)                                             COST         GAINS       LOSSES      FAIR VALUE
- -------------------------------------------------------------  ------------  -----------  -----------  ------------
<S>                                                            <C>           <C>          <C>          <C>
U.S. Treasury................................................  $    987,374   $  10,793    $     170   $    997,997
Other U.S. government........................................       709,536       6,005           67        715,474
Mortgage-backed securities...................................       679,692       3,331          265        682,758
State and municipal..........................................        90,937      13,236       --            104,173
Corporate debt securities....................................         2,698         311            1          3,008
Equity securities............................................        28,881       1,596          672         29,805
Foreign securities...........................................         5,132          39       --              5,171
                                                               ------------  -----------  -----------  ------------
    Total securities available for sale......................  $  2,504,250   $  35,311    $   1,175   $  2,538,386
                                                               ------------  -----------  -----------  ------------
                                                               ------------  -----------  -----------  ------------
</TABLE>
 
SECURITIES HELD TO MATURITY
<TABLE>
<CAPTION>
                                                                                  DECEMBER 31, 1996
                                                                   ------------------------------------------------
                                                                                  GROSS        GROSS
                                                                   AMORTIZED   UNREALIZED   UNREALIZED
(DOLLARS IN THOUSANDS)                                                COST        GAINS       LOSSES     FAIR VALUE
- -----------------------------------------------------------------  ----------  -----------  -----------  ----------
<S>                                                                <C>         <C>          <C>          <C>
U.S. Treasury....................................................  $   50,109   $   1,735    $  --       $   51,844
Other U.S. government............................................     139,188       4,412       --          143,600
Mortgage-backed securities.......................................      41,985       2,019           68       43,936
State and municipal..............................................      36,914         310        2,199       35,025
                                                                   ----------  -----------  -----------  ----------
    Total securities held to maturity............................  $  268,196   $   8,476    $   2,267   $  274,405
                                                                   ----------  -----------  -----------  ----------
                                                                   ----------  -----------  -----------  ----------
 
<CAPTION>
 
                                                                                  DECEMBER 31, 1997
                                                                   ------------------------------------------------
                                                                                  GROSS        GROSS
                                                                   AMORTIZED   UNREALIZED   UNREALIZED
(DOLLARS IN THOUSANDS)                                                COST        GAINS       LOSSES     FAIR VALUE
- -----------------------------------------------------------------  ----------  -----------  -----------  ----------
<S>                                                                <C>         <C>          <C>          <C>
U.S. Treasury....................................................  $   40,092   $   1,333    $  --       $   41,425
Other U.S. government............................................      99,520       2,568       --          102,088
Mortgage-backed securities.......................................      24,477       1,745           14       26,208
State and municipal..............................................      24,686          75        1,367       23,394
                                                                   ----------  -----------  -----------  ----------
    Total securities held to maturity............................  $  188,775   $   5,721    $   1,381   $  193,115
                                                                   ----------  -----------  -----------  ----------
                                                                   ----------  -----------  -----------  ----------
</TABLE>
 
    The amortized cost and fair value of securities, by contractual maturity,
are shown below. Expected maturities may differ from contractual maturities
because borrowers may have the right to call or prepay obligations, with or
without call or prepayment penalties.
 
                                      F-15
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
 
                            AND CONDENSED NOTES FOR
 
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 2 -- SECURITIES (CONTINUED)
MATURITY SCHEDULE OF SECURITIES
 
<TABLE>
<CAPTION>
                                                                       SECURITIES                SECURITIES
                                                                   AVAILABLE FOR SALE         HELD TO MATURITY
                                                               --------------------------  ----------------------
                                                                   DECEMBER 31, 1997         DECEMBER 31, 1997
                                                               --------------------------  ----------------------
                                                                AMORTIZED        FAIR      AMORTIZED      FAIR
(DOLLARS IN THOUSANDS)                                             COST         VALUE         COST       VALUE
- -------------------------------------------------------------  ------------  ------------  ----------  ----------
<S>                                                            <C>           <C>           <C>         <C>
Due in one year or less......................................  $    321,459  $    322,592  $   22,699  $   22,801
Due after one year through five years........................     2,101,347     2,122,154     150,467     156,069
Due after five years through ten years.......................        15,950        18,508       2,596       2,536
Due after ten years..........................................        36,613        45,327      13,013      11,709
Equity securities............................................        28,881        29,805      --          --
                                                               ------------  ------------  ----------  ----------
  Total securities...........................................  $  2,504,250  $  2,538,386  $  188,775  $  193,115
                                                               ------------  ------------  ----------  ----------
                                                               ------------  ------------  ----------  ----------
</TABLE>
 
    During the quarter ended December 31, 1995, in accordance with guidance
issued by the FASB, the Company reclassified from securities held to maturity to
securities available for sale approximately $285 million at amortized cost of
U.S. Treasury Notes (fair value $285 million) and $64 million at amortized cost
of municipal bonds (fair value $72 million). During the years ended December 31,
1996 and 1997, there were no sales or transfers from the securities held to
maturity portfolio.
 
    In 1995, proceeds from sales of securities available for sale were $241
million with gross realized gains of $2 million and gross realized losses of $3
million. In 1996, proceeds from sales of securities available for sale were $20
million with gross realized gains of $5 million and no gross realized losses. In
1997, proceeds from sales of securities available for sale were $172 million
with gross realized gains of $3 million and no gross realized losses.
 
                                      F-16
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 3 -- LOANS AND ALLOWANCE FOR CREDIT LOSSES
 
    A summary of loans net of unearned interest and fees of $150 million and
$128 million at December 31, 1996 and 1997, respectively, is as follows:
 
<TABLE>
<CAPTION>
                                                                                             DECEMBER 31,
                                                                                     ----------------------------
(DOLLARS IN THOUSANDS)                                                                   1996           1997
- -----------------------------------------------------------------------------------  -------------  -------------
<S>                                                                                  <C>            <C>
Domestic:
  Commercial, financial and industrial.............................................  $   9,495,592  $  10,747,179
  Construction.....................................................................        357,817        293,333
  Mortgage:
    Residential....................................................................      2,960,908      2,961,233
    Commercial.....................................................................      2,597,616      2,951,807
                                                                                     -------------  -------------
      Total mortgage...............................................................      5,558,524      5,913,040
  Consumer:
    Installment....................................................................      2,063,434      2,090,752
    Home equity....................................................................      1,113,269        992,916
    Credit card and other lines of credit..........................................        303,235        270,097
                                                                                     -------------  -------------
      Total consumer...............................................................      3,479,938      3,353,765
  Lease financing..................................................................        800,048        874,860
                                                                                     -------------  -------------
      Total loans in domestic offices..............................................     19,691,919     21,182,177
Loans originated in foreign branches...............................................      1,357,868      1,559,231
                                                                                     -------------  -------------
      Total loans..................................................................     21,049,787     22,741,408
        Allowance for credit losses................................................        523,946        451,692
                                                                                     -------------  -------------
      Loans, net...................................................................  $  20,525,841  $  22,289,716
                                                                                     -------------  -------------
                                                                                     -------------  -------------
</TABLE>
 
    Changes in the allowance for credit losses were as follows:
 
<TABLE>
<CAPTION>
                                                                                   YEARS ENDED DECEMBER 31,
                                                                             -------------------------------------
(DOLLARS IN THOUSANDS)                                                          1995         1996         1997
- ---------------------------------------------------------------------------  -----------  -----------  -----------
<S>                                                                          <C>          <C>          <C>
Balance, beginning of year.................................................  $   563,142  $   555,149  $   523,946
Loans charged off..........................................................     (133,599)    (119,100)    (122,779)
Loan loss recoveries.......................................................       72,403       48,024       51,014
                                                                             -----------  -----------  -----------
    Total net loans charged off............................................      (61,196)     (71,076)     (71,765)
Provision for credit losses................................................       53,250       40,000      --
Transfer of reserve for trading account assets.............................      --           --           --
Foreign translation adjustment and other net deductions....................          (47)        (127)        (489)
                                                                             -----------  -----------  -----------
Balance, end of year.......................................................  $   555,149  $   523,946  $   451,692
                                                                             -----------  -----------  -----------
                                                                             -----------  -----------  -----------
</TABLE>
 
                                      F-17
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 3 -- LOANS AND ALLOWANCE FOR CREDIT LOSSES (CONTINUED)
    Nonaccrual loans totaled $128 million and $109 million at December 31, 1996
and 1997, respectively. A significant portion of these loans were real estate
related. There were no renegotiated loans at December 31, 1996 and 1997.
Interest foregone on loans designated as nonaccrual at December 31, 1995, 1996
and 1997 was $18 million, $9 million and $6 million, respectively.
 
    LOAN IMPAIRMENT
 
    Impaired loans of the Company include commercial, financial and industrial,
construction and commercial mortgage loans designated as nonaccrual. When the
value of an impaired loan is less than the recorded investment in the loan, a
portion of the Company's allowance for credit losses is allocated as an
impairment allowance.
 
    Effective January 1, 1995, the Company's policy for recognition of interest
income, charge-offs of loans, and application of payments on impaired loans is
the same as the policy applied to nonaccrual loans.
 
    The following table sets forth information about the Company's impaired
loans at the dates indicated.
 
<TABLE>
<CAPTION>
                                                                                          DECEMBER 31,
                                                                               ----------------------------------
(DOLLARS IN THOUSANDS)                                                            1995        1996        1997
- -----------------------------------------------------------------------------  ----------  ----------  ----------
<S>                                                                            <C>         <C>         <C>
Impaired loans with an allowance.............................................  $   58,584  $   69,886  $   59,351
Impaired loans without an allowance(1).......................................     114,611      43,962      49,033
                                                                               ----------  ----------  ----------
    Total impaired loans(2)..................................................  $  173,195  $  113,848  $  108,384
                                                                               ----------  ----------  ----------
                                                                               ----------  ----------  ----------
Allowance for impaired loans.................................................  $   15,837  $   21,260  $    9,418
Average balance of impaired loans during the year............................  $  277,955  $  145,351  $  120,096
</TABLE>
 
- ------------------------
 
(1) These loans do not require an allowance for credit losses since the fair
    values of the impaired loans equal or exceed the recorded investments in the
    loans.
 
(2) This amount was evaluated for impairment using three measurement methods as
    follows: $64 million, $38 million, and $27 million was evaluated using the
    present value of the expected future cash flows at December 31, 1995, 1996
    and 1997, respectively; $95 million, $45 million, and $53 million was
    evaluated using the fair value of the collateral at December 31, 1995, 1996
    and 1997, respectively; $14 million, $31 million, and $28 million was
    evaluated using historical loss factors at December 31, 1995, 1996 and 1997,
    respectively.
 
    Interest income recognized on nonaccrual loans was $11 million, $5 million
and $3 million for the years ended December 31, 1995, 1996 and 1997,
respectively.
 
    RELATED PARTY LOANS
 
    The Company in some cases makes loans to related parties including its
directors, executive officers and their affiliated companies. At December 31,
1996, related party loans outstanding to individuals who served as directors or
executive officers at anytime during the year totaled $79 million as compared to
$38 million at December 31, 1997. In the opinion of management, these related
party loans were made on substantially the
 
                                      F-18
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 3 -- LOANS AND ALLOWANCE FOR CREDIT LOSSES (CONTINUED)
same terms, including interest rates and collateral requirements, as those terms
prevailing at the date these loans were made. During 1996 and 1997, there were
no loans to related parties which were charged off. Additionally, at December
31, 1996 and 1997, there were no loans to related parties which were
nonperforming.
 
NOTE 4 -- PREMISES AND EQUIPMENT
 
    Premises and equipment are carried at cost, less accumulated depreciation
and amortization. As of December 31, 1996 and 1997, the amounts were:
 
<TABLE>
<CAPTION>
                                                                                    DECEMBER 31,
                                                     --------------------------------------------------------------------------
                                                                     1996                                  1997
                                                     ------------------------------------  ------------------------------------
                                                                ACCUMULATED                           ACCUMULATED
                                                                DEPRECIATION                          DEPRECIATION
                                                                    AND        NET BOOK                   AND        NET BOOK
(DOLLARS IN THOUSANDS)                                 COST     AMORTIZATION     VALUE       COST     AMORTIZATION     VALUE
- ---------------------------------------------------  ---------  ------------  -----------  ---------  ------------  -----------
<S>                                                  <C>        <C>           <C>          <C>        <C>           <C>
Land...............................................  $  73,309   $   --        $  73,309   $  69,290   $   --        $  69,290
Premises...........................................    264,545       98,785      165,760     253,752      101,997      151,755
Leasehold improvements.............................    124,065       75,264       48,801     135,609       80,019       55,590
Furniture, fixtures and equipment..................    362,063      239,312      122,751     400,774      271,110      129,664
                                                     ---------  ------------  -----------  ---------  ------------  -----------
  Total............................................  $ 823,982   $  413,361    $ 410,621   $ 859,425   $  453,126    $ 406,299
                                                     ---------  ------------  -----------  ---------  ------------  -----------
                                                     ---------  ------------  -----------  ---------  ------------  -----------
</TABLE>
 
    Rental, depreciation and amortization expense were as follows:
 
<TABLE>
<CAPTION>
                                                                                      YEARS ENDED DECEMBER 31,
                                                                                   -------------------------------
(DOLLARS IN THOUSANDS)                                                               1995       1996       1997
- ---------------------------------------------------------------------------------  ---------  ---------  ---------
<S>                                                                                <C>        <C>        <C>
Rental expense of premises.......................................................  $  53,493  $  66,189  $  46,556
Less: rental income..............................................................     11,050     11,904     11,049
                                                                                   ---------  ---------  ---------
  Net rental expense.............................................................  $  42,443  $  54,285  $  35,507
                                                                                   ---------  ---------  ---------
                                                                                   ---------  ---------  ---------
Other net rental expense (income), primarily for equipment.......................  $   2,705  $   2,218  $     298
                                                                                   ---------  ---------  ---------
                                                                                   ---------  ---------  ---------
Depreciation and amortization of premises and equipment..........................  $  49,036  $  51,821  $  53,652
                                                                                   ---------  ---------  ---------
                                                                                   ---------  ---------  ---------
</TABLE>
 
                                      F-19
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 4 -- PREMISES AND EQUIPMENT (CONTINUED)
    Future minimum operating lease payments are as follows.
 
<TABLE>
<CAPTION>
(DOLLARS IN THOUSANDS)                                                                           DECEMBER 31, 1997
- -----------------------------------------------------------------------------------------------  -----------------
<S>                                                                                              <C>
Years ending December 31,
  1998.........................................................................................     $    48,156
  1999.........................................................................................          46,564
  2000.........................................................................................          38,078
  2001.........................................................................................          33,793
  2002.........................................................................................          23,654
  Later years..................................................................................         127,654
                                                                                                       --------
Total minimum operating lease payments.........................................................     $   317,899
                                                                                                       --------
                                                                                                       --------
Minimum rental income due in the future under noncancellable subleases.........................     $    36,349
                                                                                                       --------
                                                                                                       --------
</TABLE>
 
    Included in other liabilities in the accompanying December 31, 1997
Consolidated Balance Sheet is $13 million of future operating lease payments
accrued in connection with the Merger (also see Note 7).
 
    A majority of the leases provide for the payment of taxes, maintenance,
insurance and certain other expenses applicable to the leased premises. Many of
the leases contain extension provisions, escalation clauses and purchase
options. There are no restrictions on paying dividends, incurring additional
debt or negotiating additional leases under the terms of the present lease
agreements.
 
NOTE 5 -- DEPOSITS
 
    At December 31, 1997, the Company had $155 million in domestic interest
bearing time deposits exceeding $100,000 with a remaining term of greater than
one year. Maturity information for those deposits is summarized below.
 
<TABLE>
<CAPTION>
(DOLLARS IN THOUSANDS)                                                                           DECEMBER 31, 1997
- -----------------------------------------------------------------------------------------------  -----------------
<S>                                                                                              <C>
Due after one year through two years...........................................................     $    82,707
Due after two years through three years........................................................          30,064
Due after three years through four years.......................................................          21,854
Due after four years through five years........................................................          17,642
Due after five years...........................................................................           2,681
                                                                                                       --------
    Total......................................................................................     $   154,948
                                                                                                       --------
                                                                                                       --------
</TABLE>
 
    Substantially all of the foreign interest bearing time deposits exceeding
$100,000 mature in less than one year.
 
                                      F-20
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 6 -- EMPLOYEE BENEFIT AND INCENTIVE PLANS AND OTHER POSTRETIREMENT BENEFITS
 
    RETIREMENT PLANS
 
    Between April 1, 1996 and December 31, 1996, the Company maintained two
retirement plans, one covering former Union Bank employees and the other
covering former BanCal Tri-State Corporation employees. Effective January 1,
1997, the Union Bank Retirement Plan was amended and renamed the Union Bank of
California, N.A. Retirement Plan (the Plan). In addition, the plan covering
former BanCal Tri-State Corporation employees was terminated and all account
balances became fully vested. Employees of the former BanCal Tri-State
Corporation entered the Plan on January 1, 1997.
 
    The Plan is a noncontributory defined benefit plan that provides retirement
benefits based on years of credited service and the final average compensation
amount, as defined in the Plan. Employees become eligible for this plan after
one year of service and become fully vested after five years of service. Prior
Bank of California participants received credited service from date of hire for
vesting, eligibility and early retirement purposes, but only received service
from January 1, 1997 for benefit purposes. The Company's funding policy is to
make contributions equal to the maximum deductible amount as allowed by the
Internal Revenue Code. Contributions are intended to provide not only for
benefits attributed to services to date, but also for those expected to be
earned in the future. Plan assets are invested in U.S. government securities,
corporate bonds, and commingled investment funds.
 
    The following sets forth the funded status of the Plan and the amounts
recognized in the Company's Consolidated Balance Sheets at December 31, 1996 and
1997.
 
<TABLE>
<CAPTION>
                                                                                      DECEMBER 31,
                                                                                ------------------------
<S>                                                                             <C>          <C>
(DOLLARS IN THOUSANDS)                                                             1996         1997
- ------------------------------------------------------------------------------  -----------  -----------
Accumulated benefit obligation:
  Actuarial present value of benefits for services rendered to date:
    Vested....................................................................  $  (241,188) $  (297,646)
    Non-vested................................................................      (27,821)     (30,858)
                                                                                -----------  -----------
      Total...................................................................  $  (269,009) $  (328,504)
                                                                                -----------  -----------
                                                                                -----------  -----------
Projected benefit obligation..................................................  $  (323,646) $  (400,958)
 
Fair value of plan assets.....................................................      381,194      460,501
                                                                                -----------  -----------
  Projected benefit obligation less than plan assets..........................       57,548       59,543
Prior service cost not yet recognized in net periodic pension cost............        5,165       12,915
Unrecognized net gain due to change of assumptions and experience different
 from assumptions made........................................................      (29,660)     (37,717)
Unrecognized transition asset at January 1, 1986, being recognized over 13.4
 years........................................................................         (359)        (210)
                                                                                -----------  -----------
      Prepaid pension costs included in other assets..........................  $    32,694  $    34,531
                                                                                -----------  -----------
                                                                                -----------  -----------
</TABLE>
 
                                      F-21
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 6 -- EMPLOYEE BENEFIT AND INCENTIVE PLANS AND OTHER POSTRETIREMENT BENEFITS
         (CONTINUED)
    The following items are components of net pension expense.
 
<TABLE>
<CAPTION>
                                                                           YEARS ENDED DECEMBER 31,
                                                                      ----------------------------------
<S>                                                                   <C>         <C>         <C>
(DOLLARS IN THOUSANDS)                                                   1995        1996        1997
- --------------------------------------------------------------------  ----------  ----------  ----------
Service cost -- present value of benefits earned....................  $   10,516  $   12,651  $   20,667
Interest cost on projected benefit obligation.......................      19,637      22,043      25,049
Less return on plan assets:
  Actual gain.......................................................     (63,304)    (44,210)    (66,819)
  Gains in excess of expected return on plan assets.................      42,286      20,333      39,700
                                                                      ----------  ----------  ----------
    Expected return on plan assets..................................     (21,018)    (23,877)    (27,119)
Amortization of prior service cost..................................       2,108       2,108       3,175
Amortization of transition asset....................................        (149)       (149)       (149)
                                                                      ----------  ----------  ----------
    Net pension expense.............................................  $   11,094  $   12,776  $   21,623
                                                                      ----------  ----------  ----------
                                                                      ----------  ----------  ----------
</TABLE>
 
    The following summarizes the assumptions used in computing the present value
of the accumulated benefit obligation, the present value of the projected
benefit obligation and the net pension expense.
 
<TABLE>
<CAPTION>
                                                                                   YEARS ENDED DECEMBER 31,
                                                                                -------------------------------
<S>                                                                             <C>        <C>        <C>
                                                                                  1995       1996       1997
                                                                                ---------  ---------  ---------
Discount rate in determining expense..........................................       7.50%      7.50%      7.50%
Discount rate in determining benefit obligations at year end..................       7.50       7.50       7.00
Rate of increase in future compensation levels for determining expense........       5.50       5.50       5.50
Rate of increase in future compensation levels for determining benefit
 obligations at year end......................................................       5.50       5.50       5.00
Expected return on plan assets................................................       8.25       8.25       8.25
</TABLE>
 
    The former BanCal Tri-State Corporation retirement plan, which was
terminated effective January 1, 1997, was a defined contribution plan. The
Company's expense for pension contributions for the years ended December 31,
1995 and 1996 was $6 million and $5 million, respectively.
 
    EXECUTIVE SUPPLEMENTAL BENEFIT PLANS
 
    The Company has several Executive Supplemental Benefit Plans (ESBP) which
provide eligible employees with supplemental retirement benefits. The plans are
unfunded. The accrued liability for ESBP's included in other liabilities in the
Consolidated Balance Sheets was $35 million at December 31, 1996 and $39 million
at December 31, 1997. The Company's expense relating to the ESBP's was $3
million for the year ended December 31, 1995 and $4 million for each of the
years ended December 31, 1996 and 1997.
 
                                      F-22
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 6 -- EMPLOYEE BENEFIT AND INCENTIVE PLANS AND OTHER POSTRETIREMENT BENEFITS
         (CONTINUED)
    SECTION 401(K) SAVINGS PLANS
 
    The Company has a defined contribution plan authorized under Section 401(k)
of the Internal Revenue Code. All benefits-eligible employees with at least one
year of service are eligible to participate in the plan. Employees may
contribute up to 16 percent of their pre-tax covered compensation or up to 10
percent of their after-tax covered compensation through salary deductions. The
Company contributes 50 percent of every pre-tax dollar an employee contributes
up to the first 6 percent of the employee's pre-tax covered compensation.
Effective January 1, 1997, employees are fully vested in the employer's
contributions immediately. In addition, the Company may make a discretionary
annual profit-sharing contribution up to 2.5 percent of an employee's pay. This
profit-sharing contribution is for all eligible employees, regardless of whether
an employee is participating in the 401(k) plan, and depends on the Bank's
annual financial performance. All employer contributions are tax deductible by
the Company. The Company's combined matching contribution expense was $9
million, $9 million and $13 million for the years ended December 31, 1995, 1996
and 1997, respectively.
 
    OTHER POSTRETIREMENT BENEFITS
 
    The Company provides certain health care and life insurance benefits for its
retired employees. The health care cost is shared between the Company and the
retiree. The life insurance plan is noncontributory. The accounting for the
health care plan anticipates future cost-sharing changes to the written plan
that are consistent with the Company's intent to maintain a level of
cost-sharing at approximately 25 percent. Assets set aside to cover such
obligations are primarily invested in mutual funds.
 
    The following table sets forth the plan's combined funded status recognized.
 
<TABLE>
<CAPTION>
                                                                                    DECEMBER 31,
                                                                             --------------------------
(DOLLARS IN THOUSANDS)                                                           1996          1997
- ---------------------------------------------------------------------------  ------------  ------------
<S>                                                                          <C>           <C>
Accumulated postretirement benefit obligation:
  Retirees.................................................................   $  (48,747)   $  (48,519)
  Fully eligible plan participants.........................................      (11,876)      (12,208)
  Other active plan participants...........................................      (19,651)      (18,581)
                                                                             ------------  ------------
    Accumulated postretirement obligation..................................      (80,274)      (79,308)
Fair value of plan assets..................................................       21,703        31,136
                                                                             ------------  ------------
  Accumulated postretirement obligation in excess of plan assets...........      (58,571)      (48,172)
Unrecognized net gain due to change in assumption and experience different
 from assumptions made.....................................................      (14,829)      (21,119)
Unrecognized transition obligation.........................................       63,800        59,813
                                                                             ------------  ------------
    Accrued postretirement benefit cost....................................   $   (9,600)   $   (9,478)
                                                                             ------------  ------------
                                                                             ------------  ------------
</TABLE>
 
                                      F-23
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 6 -- EMPLOYEE BENEFIT AND INCENTIVE PLANS AND OTHER POSTRETIREMENT BENEFITS
         (CONTINUED)
    The following table sets forth the components of postretirement benefit
expense.
 
<TABLE>
<CAPTION>
                                                                      YEARS ENDED DECEMBER 31,
                                                              ----------------------------------------
(DOLLARS IN THOUSANDS)                                            1995          1996          1997
- ------------------------------------------------------------  ------------  ------------  ------------
<S>                                                           <C>           <C>           <C>
Service cost................................................   $    1,792    $    1,741    $    3,123
Interest cost...............................................        6,091         5,581         5,150
Actual return on plan assets................................       (3,337)       (2,590)       (4,445)
Net amortization and deferral...............................        5,559         4,397         4,826
                                                              ------------  ------------  ------------
  Net periodic postretirement benefit cost..................   $   10,105    $    9,129    $    8,654
                                                              ------------  ------------  ------------
                                                              ------------  ------------  ------------
 
Postretirement benefit claims paid for the year.............   $    5,309    $    3,808    $    3,787
                                                              ------------  ------------  ------------
                                                              ------------  ------------  ------------
</TABLE>
 
    The unrecognized transition obligation recorded on January 1, 1993 is being
amortized over 20 years.
 
    For 1995, the former Union Bank assumed a 9 percent annual rate of increase
in the per capita cost of postretirement medical benefits for the indemnity plan
and a 4 percent annual rate of increase was assumed for the HMO plan. For future
periods the assumed rate for the indemnity plan gradually decreased from 9
percent to 5.5 percent in 2007 and remained level thereafter. The assumed rate
of change on the HMO plan increased for the remainder of the decade, then
gradually decreased to 5.5 percent in the year 2007 and thereafter.
 
    For 1995, former BanCal Tri-State Corporation assumed an 11.5 percent annual
rate of increase in the per capita cost of postretirement medical benefits for
the indemnity plan. For future periods, the assumed rate for the indemnity plan
gradually decreased from 11.5 percent to 5.5 percent in 2003 and remained level
thereafter.
 
    For 1996, the Company assumed a 9 percent annual rate of increase in the per
capita cost of postretirement medical benefits for the indemnity plan and a 4
percent annual rate of increase was assumed for the HMO plan. For future periods
the assumed rate for the indemnity plan gradually decreased from 9 percent to
5.5 percent in 2007 and remained level thereafter. The assumed rate of change on
the HMO plan increased to 7 percent in 1997 and then gradually decreased to 5.5
percent in the year 2007 and thereafter.
 
    For 1997, the Company assumed a 9 percent annual rate of increase in the per
capita cost of postretirement medical benefits for the indemnity plan and a 4
percent annual rate of increase was assumed for the health maintenance
organization (HMO) plan. For future periods, the rate for the indemnity plan was
expected to gradually decrease from 9 percent to 5.5 percent in 2007 and remain
at that level thereafter. The rate for the HMO plan was expected to increase
after one year of being at a low rate and then gradually decrease to 5.5 percent
in the year 2007 and thereafter.
 
    The healthcare cost trend rate assumption has a significant effect on the
amounts reported. To illustrate, increasing the assumed health care cost trend
rates by one percentage point in each year would
 
                                      F-24
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 6 -- EMPLOYEE BENEFIT AND INCENTIVE PLANS AND OTHER POSTRETIREMENT BENEFITS
         (CONTINUED)
increase the accumulated postretirement benefit obligation as of December 31,
1997 by $11 million and the aggregate of the service and interest cost
components of net periodic postretirement benefit cost for the year then ended
by $1 million.
 
    The discount rate used in determining the actuarial present value of the
accumulated postretirement benefit obligation was 7.50% as of December 31, 1995
and 1996 and 7.00% as of December 31, 1997. The estimated rate of return on plan
assets was 8.00% as of December 31, 1995, 1996 and 1997.
 
NOTE 7 -- OTHER EXPENSES
 
    The detail of other expenses is as follows:
 
<TABLE>
<CAPTION>
                                                                                    YEARS ENDED DECEMBER 31,
                                                                               ----------------------------------
(DOLLARS IN THOUSANDS)                                                            1995        1996        1997
- -----------------------------------------------------------------------------  ----------  ----------  ----------
<S>                                                                            <C>         <C>         <C>
Merchant transaction processing fees.........................................  $   31,288  $   37,091  $   42,274
Communications...............................................................      35,806      40,133      42,372
Professional services........................................................      26,197      24,342      28,075
Advertising and public relations.............................................      20,911      28,788      28,664
Data processing..............................................................      18,557      22,140      25,973
Printing and office supplies.................................................      22,626      27,085      24,098
Regulatory assessments.......................................................      23,431       4,048       5,778
Other........................................................................     117,908     114,400     129,251
                                                                               ----------  ----------  ----------
    Total other expenses.....................................................  $  296,724  $  298,027  $  326,485
                                                                               ----------  ----------  ----------
                                                                               ----------  ----------  ----------
</TABLE>
 
    In connection with the Merger, the Company incurred merger and integration
expense of $117 million and $6 million for the years ended 1996 and 1997,
respectively, as summarized in the following table.
 
<TABLE>
<CAPTION>
                                                                                             YEARS ENDED DECEMBER
                                                                                                      31,
                                                                                             ---------------------
(DOLLARS IN THOUSANDS)                                                                          1996       1997
- -------------------------------------------------------------------------------------------  ----------  ---------
<S>                                                                                          <C>         <C>
Balance, accrued merger and integration expense, beginning of year.........................  $   --      $  54,344
Provision for merger and integration costs.................................................     117,464      6,037
Utilization:
  Cash.....................................................................................      40,155     35,809
  Noncash..................................................................................      22,965      1,642
                                                                                             ----------  ---------
    Total utilization......................................................................      63,120     37,451
                                                                                             ----------  ---------
Balance, accrued merger and integration expense, end of year...............................  $   54,344  $  22,930
                                                                                             ----------  ---------
                                                                                             ----------  ---------
</TABLE>
 
    Total merger and integration expense of $124 million was recorded to cover
$38 million of personnel expense for severance, retention and other employee
related costs, $54 million for facilities expense related
 
                                      F-25
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 7 -- OTHER EXPENSES (CONTINUED)
to redundant banking facilities, and $32 million in professional services and
other expense. At December 31, 1997, the liability balance included amounts
primarily for severance payments that are being paid on a periodic basis and for
operating lease payments related to redundant banking facilities which are
continuing over the expected term of the leases.
 
NOTE 8 -- INCOME TAXES
 
    The components of income tax expense were as follows:
 
<TABLE>
<CAPTION>
                                                                                    YEARS ENDED DECEMBER 31,
                                                                               ----------------------------------
(DOLLARS IN THOUSANDS)                                                            1995        1996        1997
- -----------------------------------------------------------------------------  ----------  ----------  ----------
<S>                                                                            <C>         <C>         <C>
Taxes currently payable:
  Federal....................................................................  $   96,732  $   86,159  $  168,375
  State......................................................................      42,356      23,180       8,441
  Foreign....................................................................       3,430       2,895       2,092
                                                                               ----------  ----------  ----------
    Total currently payable..................................................     142,518     112,234     178,908
                                                                               ----------  ----------  ----------
Taxes deferred:
  Federal....................................................................      34,839      47,575      49,437
  State......................................................................      16,005       3,455      10,499
  Foreign....................................................................          (3)       (372)       (122)
                                                                               ----------  ----------  ----------
    Total deferred...........................................................      50,841      50,658      59,814
                                                                               ----------  ----------  ----------
    Total income tax expense.................................................  $  193,359  $  162,892  $  238,722
                                                                               ----------  ----------  ----------
                                                                               ----------  ----------  ----------
</TABLE>
 
                                      F-26
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 8 -- INCOME TAXES (CONTINUED)
    The components of the net deferred tax balances of the Company were as
follows:
 
<TABLE>
<CAPTION>
                                                                                                 DECEMBER 31,
                                                                                            ----------------------
(DOLLARS IN THOUSANDS)                                                                         1996        1997
- ------------------------------------------------------------------------------------------  ----------  ----------
<S>                                                                                         <C>         <C>
Deferred tax assets:
  Allowance for credit losses.............................................................  $  195,128  $  169,769
  Accrued income & expense................................................................      31,964      21,987
  Accrued merger expense..................................................................      22,051      15,641
  Deferred state taxes....................................................................      13,572      21,063
  Other...................................................................................       2,567       7,585
                                                                                            ----------  ----------
    Total deferred tax assets.............................................................     265,282     236,045
                                                                                            ----------  ----------
Deferred tax liabilities:
  Leasing.................................................................................     276,922     297,891
  Depreciation............................................................................      13,809      17,192
  Unrealized gain on securities available for sale........................................       9,711      13,536
                                                                                            ----------  ----------
    Total deferred tax liabilities........................................................     300,442     328,619
                                                                                            ----------  ----------
      Net deferred tax liability..........................................................  $   35,160  $   92,574
                                                                                            ----------  ----------
                                                                                            ----------  ----------
</TABLE>
 
    The following table is an analysis of the effective tax rate.
 
<TABLE>
<CAPTION>
                                                                                               YEARS ENDED DECEMBER 31,
                                                                                         -------------------------------------
                                                                                            1995         1996         1997
                                                                                            -----        -----        -----
<S>                                                                                      <C>          <C>          <C>
Federal income tax rate................................................................          35%          35%          35%
Net tax effects of:
  State income taxes, net of federal income tax benefit................................           5            4            2
  Tax-exempt interest income...........................................................          (1)          (1)          (1)
  Amortization of intangibles..........................................................           1            1            1
  Other................................................................................          (2)           1           --
                                                                                                 --           --           --
    Effective tax rate.................................................................          38%          40%          37%
                                                                                                 --           --           --
                                                                                                 --           --           --
</TABLE>
 
    During 1997, the Company received a refund from the State of California
Franchise Tax Board of approximately $25 million (net of federal taxes of $17
million) in settlement of litigation, administration and audit disputes covering
the years 1975-1987. The refund was recorded as a reduction to state income tax
expense.
 
    During the nine months ended September 30, 1998, a reduction in state income
tax liabilities of $52.4 million, net of federal tax, was recorded. Of the $52.4
million reduction, $29 million related to the reversal of previously accrued
1997 state income tax liabilities and $23.4 million related to a lower tax
 
                                      F-27
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 8 -- INCOME TAXES (CONTINUED)
provision in 1998. The decrease in the effective tax rate in 1998 resulted from
the Company's ability to file California franchise tax returns on a worldwide
unitary basis, which incorporates the financial results of BTM and its worldwide
affiliates.
 
    Federal and state tax returns for several years are under or subject to
examination by the respective taxing authorities. Although the ultimate outcome
of such examinations cannot be determined at this time, management believes that
the resolution of issues that have been or may be raised will not have a
material adverse effect on the Company's consolidated financial position or
results of operations.
 
NOTE 9 -- BORROWED FUNDS
 
    The following is a summary of the major categories of borrowed funds.
 
<TABLE>
<CAPTION>
                                                                                               DECEMBER 31,
                                                                                        --------------------------
(DOLLARS IN THOUSANDS)                                                                      1996          1997
- --------------------------------------------------------------------------------------  ------------  ------------
<S>                                                                                     <C>           <C>
Federal funds purchased and securities sold under repurchase agreements with weighted
  average interest rates of 5.09% and 5.38% at December 31, 1996 and 1997,
  respectively........................................................................  $  1,322,654  $  1,335,884
Commercial paper with weighted average interest rates of 5.34% and 5.64% at December
  31, 1996 and 1997, respectively.....................................................     1,495,463       966,575
Other borrowed funds with weighted average interest rates of 5.66% and 6.23% at
  December 31, 1996 and 1997, respectively............................................       749,422       476,010
                                                                                        ------------  ------------
    Total borrowed funds..............................................................  $  3,567,539  $  2,778,469
                                                                                        ------------  ------------
                                                                                        ------------  ------------
 
Federal funds purchased and securities sold under repurchase agreements:
  Maximum outstanding at any month end................................................  $  1,322,654  $  1,575,930
  Average balance during the year.....................................................       933,433     1,097,707
  Weighted average interest rate during the year......................................          5.05%         5.33%
 
Commercial paper:
  Maximum outstanding at any month end................................................  $  1,854,576  $  1,876,135
  Average balance during the year.....................................................     1,620,087     1,637,070
  Weighted average interest rate during the year......................................          5.40%         5.49%
 
*Other borrowed funds:
  Maximum outstanding at any month end................................................  $  1,697,236  $    851,694
  Average balance during the year.....................................................     1,119,051       635,900
  Weighted average interest rate during the year......................................          5.59%         5.42%
</TABLE>
 
                                      F-28
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 10 -- SUBORDINATED CAPITAL NOTES AND PREFERRED STOCK
 
    The following is a summary of capital notes which are subordinated to other
obligations of the Company.
 
<TABLE>
<CAPTION>
                                                                                                 DECEMBER 31,
                                                                                            ----------------------
(DOLLARS IN THOUSANDS)                                                                         1996        1997
- ------------------------------------------------------------------------------------------  ----------  ----------
<S>                                                                                         <C>         <C>
Floating rate notes due June 2007. These notes bear interest at 0.325% above 3-month
  London Interbank Offered Rate (LIBOR) and are payable to the holder of the note (BTM at
  December 31, 1997)......................................................................  $   --      $  200,000
Floating rate notes due July 2000. These notes bear interest at 0.30% above 3-month
  LIBOR...................................................................................      98,000      98,000
Floating rate notes due July 1997 and July 1998. These notes bear interest at 0.25% above
  3-month LIBOR and are payable to BTM....................................................     100,000      50,000
8.00% fixed rate notes due February 2002. The notes were called at par on February 25,
  1997....................................................................................     100,000      --
6.67% fixed rate notes due August 2002. The notes were called at par on August 20, 1997...      50,000      --
Fixed rate and floating rate notes matured in October 1997, with $23,000 bearing interest
  at fixed rates of 10.05% to 10.14% and notes totaling $11,000 bearing interest at 0.375%
  above 3-month LIBOR.....................................................................      34,000      --
                                                                                            ----------  ----------
    Total subordinated capital notes......................................................  $  382,000  $  348,000
                                                                                            ----------  ----------
                                                                                            ----------  ----------
</TABLE>
 
    All of the above notes qualify as Tier 2 risk-based capital under the
Federal Reserve guidelines for assessing regulatory capital. For the total
risk-based capital ratio, the amount of notes which qualify as capital is
reduced as the notes approach maturity. At December 31, 1996 and 1997, $219
million and $239 million, respectively, of the notes qualified as risk-based
capital.
 
    Provisions of several of the notes restrict the use of the Company's
property as security for borrowings, and place limitations on leases,
indebtedness, distributions to shareholders, mergers, sales of certain assets,
transactions with affiliates and changes in majority stock ownership of the
Company.
 
    The following table presents the maturities of subordinated capital notes.
 
<TABLE>
<CAPTION>
(DOLLARS IN THOUSANDS)                                                       DECEMBER 31, 1997
- ---------------------------------------------------------------------------  -----------------
<S>                                                                          <C>
Years ending December 31,
  1998.....................................................................     $    50,000
  2000.....................................................................          98,000
  Years after 2002.........................................................         200,000
                                                                                   --------
    Total..................................................................     $   348,000
                                                                                   --------
                                                                                   --------
</TABLE>
 
    At December 31, 1996, the Company had outstanding 1,350,000 shares (or
5,400,000 depositary shares) of 8 3/8% Noncumulative Preferred Stock, Series A
(Preferred Stock) totaling $135 million. On September 3, 1997, the Company
redeemed all 1,350,000 outstanding shares of its Preferred Stock, reducing
shareholders'
 
                                      F-29
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 10 -- SUBORDINATED CAPITAL NOTES AND PREFERRED STOCK (CONTINUED)
equity by $135 million. The redemption price was equal to the stated value of
$100 per share of Preferred Stock (equivalent to $25 per depositary share), plus
$2 million in accrued and unpaid dividends to the redemption date. The
redemption was funded by proceeds from the issuance of $200 million in
subordinated capital notes in June 1997.
 
NOTE 11 -- DIVIDEND REINVESTMENT AND STOCK PURCHASE PLAN
 
    The Company has a dividend reinvestment and stock purchase plan for
shareholders. The plan allows shareholders to automatically reinvest all or part
of their dividends in additional shares of the Company's common stock at a cost
of 5 percent below the market price. Participating shareholders also have the
option of purchasing additional shares at full market price with cash payments
of $25 to $3,000 per quarter. The Company obtains shares required for
reinvestment through open market purchases or by the issuance of new shares from
its authorized but unissued stock. During the years ended December 31, 1995,
1996, and 1997, 1,862,034; 155,724; and, 131,127 shares, respectively, were
required for dividend reinvestment purposes, of which 1,862,034; 71,706; and,
3,897 shares were considered new issuances during 1995, 1996 and 1997,
respectively. BTM discontinued its participation in the plan after the quarter
ended March 31, 1995 and did not participate in the plan as of December 31,
1997.
 
NOTE 12 -- MANAGEMENT STOCK PLAN
 
    The Company has a management stock plan (the Stock Plan) which has 6,600,000
shares of the Company's common stock authorized to be awarded to key employees
and outside directors of the Company and its subsidiaries at the discretion of
the Executive Compensation and Benefits Committee of the Board of Directors (the
Committee). The combined number of shares that are granted under the Stock Plan
cannot exceed 6,600,000 shares of the Company's common stock. Committee members
and employees on rotational assignment from BTM are not eligible for stock
awards.
 
    The Committee determines the term of each stock option grant, up to a
maximum of ten years from the date of grant. The exercise price of the options
issued under the Stock Plan shall not be less than the fair market value on the
date the option is granted. Unvested restricted stock issued under the Stock
Plan is shown as a reduction to retained earnings. The value of the restricted
shares at the date of grant is amortized to compensation expense over its
vesting period. All cancelled or forfeited options and restricted stock become
available for future grants.
 
    In 1995, 1996 and 1997, the Company granted options to various key
employees, including principal officers, under the Stock Plan. The stock options
vest pro rata on each anniversary of the grant date and become fully exercisable
three years from the grant date, provided that the employee has completed the
specified continuous service requirement. They vest earlier if the employee
dies, is permanently and totally disabled, or retires under certain grant, age
and service conditions.
 
                                      F-30
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 12 -- MANAGEMENT STOCK PLAN (CONTINUED)
    The following is a summary of stock option transactions under the Stock
Plan.
 
<TABLE>
<CAPTION>
                                                        YEARS ENDED DECEMBER 31,
                       -------------------------------------------------------------------------------------------
                                   1995                           1996                           1997
                       -----------------------------  -----------------------------  -----------------------------
                       NUMBER OF   WEIGHTED-AVERAGE   NUMBER OF   WEIGHTED-AVERAGE   NUMBER OF   WEIGHTED-AVERAGE
                         SHARES     EXERCISE PRICE      SHARES     EXERCISE PRICE      SHARES     EXERCISE PRICE
                       ----------  -----------------  ----------  -----------------  ----------  -----------------
<S>                    <C>         <C>                <C>         <C>                <C>         <C>
Options outstanding,
 beginning of year...     740,502      $    9.94       1,082,106      $   10.42       1,263,807      $   12.13
  Granted............     389,100          11.25         277,200          18.29         441,900          22.13
  Exercised..........     (47,496)          9.83         (80,496)         10.69        (289,029)         10.84
  Forfeited..........      --             --             (15,003)        --             (19,500)         22.13
                       ----------                     ----------                     ----------
Options outstanding,
 end of year.........   1,082,106      $   10.42       1,263,807      $   12.13       1,397,178      $   15.41
                       ----------                     ----------                     ----------
                       ----------                     ----------                     ----------
Options exercisable,
 end of year.........     407,466      $    9.78         686,145      $   10.38         712,107      $   11.50
                       ----------                     ----------                     ----------
                       ----------                     ----------                     ----------
</TABLE>
 
    The weighted-average fair value of options granted was $3.13 during 1995,
$6.00 during 1996, and $6.94 during 1997.
 
    The following table summarizes information about stock options outstanding.
 
<TABLE>
<CAPTION>
                         OPTIONS OUTSTANDING AT DECEMBER 31, 1997          OPTIONS EXERCISABLE AT
                     ------------------------------------------------        DECEMBER 31, 1997
                                  WEIGHTED-AVERAGE                     ------------------------------
     RANGE OF          NUMBER        REMAINING      WEIGHTED-AVERAGE     NUMBER     WEIGHTED-AVERAGE
  EXERCISE PRICES    OUTSTANDING  CONTRACTUAL LIFE   EXERCISE PRICE    EXERCISABLE   EXERCISE PRICE
- -------------------  -----------  ----------------  -----------------  -----------  -----------------
<S>                  <C>          <C>               <C>                <C>          <C>
   $6.66 - 9.08         267,408      5.0 years          $    8.34         267,408       $    8.34
   11.25 - 12.83        456,114         6.2                 11.76         348,867           11.92
       18.29            251,256         7.7                 18.29          83,832           18.29
       22.13            422,400         9.1                 22.13          12,000           22.13
                     -----------                                       -----------
                      1,397,178                                           712,107
                     -----------                                       -----------
                     -----------                                       -----------
</TABLE>
 
    In 1995, 1996 and 1997, the Company also granted 231,210; 133,440; and,
178,320 shares, respectively, of restricted stock to key officers, including
executive officers, under the Stock Plan. The awards of restricted stock vest
pro rata on each anniversary of the grant date and become fully vested four
years from the grant date, provided that the employee has completed the
specified continuous service requirement. They vest earlier if the employee
dies, is permanently and totally disabled, or retires under certain grant, age
and service conditions. Restricted shareholders have the right to vote their
restricted shares and receive dividends.
 
                                      F-31
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 12 -- MANAGEMENT STOCK PLAN (CONTINUED)
    The following is a summary of restricted stock transactions under the Stock
Plan.
 
<TABLE>
<CAPTION>
                                                        YEARS ENDED DECEMBER 31,
                       -------------------------------------------------------------------------------------------
                                   1995                           1996                           1997
                       -----------------------------  -----------------------------  -----------------------------
                                   WEIGHTED-AVERAGE               WEIGHTED-AVERAGE               WEIGHTED-AVERAGE
                       NUMBER OF      GRANT DATE      NUMBER OF      GRANT DATE      NUMBER OF      GRANT DATE
                         SHARES       FAIR VALUE        SHARES       FAIR VALUE        SHARES       FAIR VALUE
                       ----------  -----------------  ----------  -----------------  ----------  -----------------
<S>                    <C>         <C>                <C>         <C>                <C>         <C>
Restricted stock
 awards outstanding,
 beginning of year...     817,608      $    8.25       1,044,951      $    8.99       1,166,820      $   10.04
  Granted............     231,210          11.61         133,440          18.29         178,320          22.18
  Cancelled..........      (3,867)          9.72         (11,571)         10.78          (7,923)         20.08
                       ----------                     ----------                     ----------
Restricted stock
 awards outstanding,
 end of year.........   1,044,951      $    8.99       1,166,820      $   10.04       1,337,217      $   11.59
                       ----------                     ----------                     ----------
                       ----------                     ----------                     ----------
Restricted stock
 awards vested, end
 of year.............     568,449      $    7.81         764,670      $    8.35         942,738      $    9.17
                       ----------                     ----------                     ----------
                       ----------                     ----------                     ----------
</TABLE>
 
    At December 31, 1995, 1996 and 1997, 1,342,449; 958,383; and, 3,365,586
shares, respectively, were available for future grants as either stock options
or restricted stock under the Stock Plan.
 
    The Company follows the intrinsic value based method in accounting for its
employee stock-based compensation plan. Accordingly, no compensation cost has
been recognized for its stock option grants. Had compensation cost for the
Company's stock-based plan been determined based on the fair value at the grant
dates for awards under that plan consistent with the method of SFAS No. 123,
"Accounting for Stock-Based Compensation", the Company's net income and net
income per share would have decreased to the pro forma amounts indicated in the
following table. Options that were granted prior to January 1, 1995 with vesting
periods in 1995 and later are excluded from the pro forma results indicated for
1995 and 1996 in the following table.
 
<TABLE>
<CAPTION>
                                                                                YEARS ENDED DECEMBER 31,
                                                                           ----------------------------------
(DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)                                 1995        1996        1997
- -------------------------------------------------------------------------  ----------  ----------  ----------
<S>                                                        <C>             <C>         <C>         <C>
Net income...............................................     As reported  $  312,942  $  249,458  $  411,296
                                                                Pro forma     312,691     248,874     410,068
Net income applicable to common stock....................     As reported  $  301,637  $  238,152  $  403,696
                                                                Pro forma     301,386     237,568     402,468
Net income per common share -- basic.....................     As reported  $     1.74  $     1.37  $     2.31
                                                                Pro forma        1.73        1.36        2.30
Net income per common share -- diluted...................     As reported  $     1.73  $     1.36  $     2.30
                                                                Pro forma        1.73        1.36        2.30
</TABLE>
 
                                      F-32
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 12 -- MANAGEMENT STOCK PLAN (CONTINUED)
    The fair value of each option grant is estimated on the date of grant using
the Black-Scholes option pricing model with the following weighted-average
assumptions used for grants made in the years ended 1995, 1996 and 1997:
risk-free interest rates of 7.1%, 6.3% and 6.6% in the years ended 1995, 1996
and 1997, respectively; expected volatility of 28%, 28% and 26% in the years
ended 1995, 1996 and 1997, respectively; expected lives of 7 years for the years
ended 1995 and 1996, respectively, and 6 years for the year ended 1997; and
expected dividend yields of 4.2%, 2.6% and 2.1% in the years ended 1995, 1996
and 1997.
 
    Effective January 1, 1997, the Company established a Performance Share Plan.
Eligible participants may earn performance share awards to be redeemed in cash
three years after the date of grant. Performance shares are linked to
shareholder value in two ways: (1) the market price of the Company's common
stock, and (2) return on assets, a performance measure closely linked to value
creation. Eligible participants generally receive grants of performance shares
annually. The total number of performance shares granted under the plan cannot
exceed 600,000 and the Company granted 14,400 shares in the year ended 1997. The
value of a performance share is equal to the market price of the Company's
common stock. All cancelled or forfeited performance shares become available for
future grants.
 
NOTE 13 -- FAIR VALUE OF FINANCIAL INSTRUMENTS
 
    The fair value of a financial instrument is the amount at which the
instrument could be exchanged in a current transaction between willing parties,
other than in a forced or liquidation sale. All of the fair values presented
below have been made under this definition of fair value unless otherwise
disclosed.
 
    It is management's belief that the fair values presented below are
reasonable based on the valuation techniques and data available to the Company
as of December 31, 1996 and 1997, as more fully described below. It should be
noted that the operations of the Company are managed on a going concern basis
and not a liquidation basis. As a result, the ultimate value realized for the
financial instruments presented could be substantially different when actually
recognized over time through the normal course of operations. Additionally, a
substantial portion of an institution's inherent value is its capitalization and
franchise value. Neither of these components have been given consideration in
the presentation of fair values which follow.
 
                                      F-33
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 13 -- FAIR VALUE OF FINANCIAL INSTRUMENTS (CONTINUED)
    The table below presents the carrying value and fair value of the specified
assets and liabilities held by the Company.
<TABLE>
<CAPTION>
                                                                             DECEMBER 31,
                                                     ------------------------------------------------------------
<S>                                                  <C>             <C>            <C>             <C>
                                                                 1996                           1997
                                                     -----------------------------  -----------------------------
 
<CAPTION>
(DOLLARS IN THOUSANDS)                               CARRYING VALUE   FAIR VALUE    CARRYING VALUE   FAIR VALUE
- ---------------------------------------------------  --------------  -------------  --------------  -------------
<S>                                                  <C>             <C>            <C>             <C>
ASSETS
Cash and cash equivalents..........................   $  3,937,697   $   3,937,697   $  3,199,455   $   3,199,455
Trading account assets.............................        465,782         465,782        394,313         394,313
Securities available for sale......................      2,164,197       2,164,197      2,538,386       2,538,386
Securities held to maturity........................        268,196         274,405        188,775         193,115
Loans, net of allowance for credit losses..........     20,525,841      20,803,651     22,289,716      22,511,510
 
LIABILITIES
Deposits:
  Noninterest bearing..............................      7,655,109       7,655,109      8,849,544       8,849,544
  Interest bearing.................................     13,877,851      13,885,504     14,446,830      14,453,029
                                                     --------------  -------------  --------------  -------------
    Total deposits.................................     21,532,960      21,540,613     23,296,374      23,302,573
Borrowed funds.....................................      3,567,539       3,567,836      2,778,469       2,775,531
Subordinated capital notes.........................        382,000         388,388        348,000         348,000
</TABLE>
 
    The Company is also a party to financial instruments that are not reflected
on the balance sheet but represent obligations of the Company in the normal
course of business. For information regarding the fair value of off-balance
sheet financial instruments, see Note 14.
 
    The following methods and assumptions were used to estimate fair value of
each class of financial instruments for which it is practicable to estimate that
value.
 
    CASH AND CASH EQUIVALENTS:  The book value of cash and cash equivalents is
considered a reasonable estimate of fair value.
 
    TRADING ACCOUNT ASSETS:  Trading account assets are short term in nature and
valued at market based on quoted market prices or dealer quotes. If a quoted
market price is not available, the recorded amounts are estimated using quoted
market prices for similar securities. Thus, carrying value is considered a
reasonable estimate of fair value for these financial instruments.
 
    SECURITIES:  The fair value of securities is based on quoted market prices
or dealer quotes. If a quoted market price is not available, fair value is
estimated using quoted market prices for similar securities. Available for sale
securities are carried at their aggregate fair value, while held to maturity
securities are carried at amortized cost.
 
    LOANS:  The fair value for performing fixed and non-reference rate loans was
estimated by discounting the future cash flows using the current rates at which
similar loans would be made to borrowers with similar credit ratings and for
similar remaining maturities and where available, discount rates were based on
current market rates.
 
                                      F-34
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 13 -- FAIR VALUE OF FINANCIAL INSTRUMENTS (CONTINUED)
    The fair value of performing loans tied to the Company's reference rate with
normal credit risk is assumed to approximate their book value. The fair value
for these floating rate loans with increasing credit risk was estimated by
calculating their present value using a yield the Company would currently
require for loans with similar terms to borrowers with similar credit quality.
 
    Loans which are on nonaccrual status were not included in the loan valuation
methods discussed previously. The fair value of these assets was estimated
assuming these loans were sold on a liquidation basis.
 
    The fair value of performing mortgage loans was based on quoted market
prices for loans with similar credit and interest rate risk characteristics.
 
    The fair value of performing credit card loans and credit lines is assumed
to approximate their book value. The fair value was estimated for credit card
loans and credit lines which were past due at December 31, 1996 and 1997 by
segregating them according to their past due status and then discounting them
based on the Company's historical probability of loss.
 
    NONINTEREST BEARING DEPOSITS:  The fair value of noninterest bearing
deposits is the amount payable on demand at the reporting date. The fair value
of the demand deposit intangible has not been estimated.
 
    INTEREST BEARING DEPOSITS:  The fair value of savings accounts and certain
money market accounts is the amount payable on demand at the reporting date. The
fair value of fixed maturity certificates of deposit was estimated using rates
currently being offered on certificates with similar maturities.
 
    BORROWED FUNDS:  The book values of federal funds purchased, securities sold
under repurchase agreements and other short-term borrowings are assumed to
approximate their fair value due to their limited duration characteristics. The
fair value for commercial paper and term federal funds purchased was estimated
using market quotes.
 
    SUBORDINATED CAPITAL NOTES:  The fair value of fixed-rate subordinated
capital notes was estimated using discounted cash flows based on market rates
for A-rated bank borrowings. The book values for variable-rate subordinated
capital notes are assumed to approximate fair market value.
 
NOTE 14 -- DERIVATIVE INSTRUMENTS AND OTHER FINANCIAL INSTRUMENTS WITH
          OFF-BALANCE SHEET RISK
 
    The Company is a party to certain derivative and other financial instruments
that are not reflected on the balance sheet but represent obligations or assets
of the Company in the normal course of business. These financial instruments are
used for trading activities of the Company, to meet the needs of customers and
to reduce the impact on the Company's operating results due to market
fluctuations in currency or interest rates.
 
    These financial instruments involve, to varying degrees, elements of credit
and market risk which are not recognized on the balance sheet. Credit risk is
defined as the possibility that a loss may occur from the failure of another
party to perform in accordance with the terms of the contract which exceeds the
value of the existing collateral, if any. Market risk is the possibility that
future changes in market conditions may make the financial instrument less
valuable.
 
                                      F-35
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 14 -- DERIVATIVE INSTRUMENTS AND OTHER FINANCIAL INSTRUMENTS WITH
          OFF-BALANCE SHEET RISK (CONTINUED)
    DERIVATIVE INSTRUMENTS
 
    The fair value of the derivative financial instruments was calculated based
on quoted market prices where available or if quoted market prices were not
available, the Company used the estimated amount it would receive or pay to
offset or terminate the agreements based upon the terms of such contracts
relative to prevailing interest rates.
 
    TRADING ACTIVITIES IN DERIVATIVE INSTRUMENTS
 
    The following table reflects the Company's positions relating to trading
activities in derivative instruments. Trading activities include both activities
for the Company's own account and for customers. At December 31, 1996 and 1997,
the majority of the Company's derivative transactions for customers are hedged
with essentially offsetting contracts with other counterparties. The average
fair value of derivatives held or written for trading purposes during the year
is not significant. The notional amount of derivative instruments reflects the
extent of the Company's involvement in these instruments. For interest rate
swap, cap and floor agreements, notional amounts do not represent exposure to
credit or market risk. Notional amounts are not exchanged, but serve as a point
of reference for calculating payments.
 
                                      F-36
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 14 -- DERIVATIVE INSTRUMENTS AND OTHER FINANCIAL INSTRUMENTS WITH
          OFF-BALANCE SHEET RISK (CONTINUED)
    The following is a summary of derivative instruments held or written for
trading purposes.
<TABLE>
<CAPTION>
                                                                                            DECEMBER 31,
                                                                      ---------------------------------------------------------
                                                                                    1996                          1997
                                                                      ---------------------------------  ----------------------
                                                                      NOTIONAL    CREDIT     ESTIMATED    NOTIONAL     CREDIT
(DOLLARS IN THOUSANDS)                                                 AMOUNTS    RISK(1)   FAIR VALUE     AMOUNTS     RISK(1)
- --------------------------------------------------------------------  ---------  ---------  -----------  -----------  ---------
<S>                                                                   <C>        <C>        <C>          <C>          <C>
HELD OR WRITTEN FOR TRADING PURPOSES AND CUSTOMER ACCOMMODATIONS
Foreign exchange forward contracts:
  Commitments to purchase...........................................  $ 403,602  $   2,813   $ (11,735)  $   531,330  $     366
  Commitments to sell...............................................    530,923     18,958      14,759       709,512     40,671
Foreign exchange OTC options:
  Options purchased.................................................     --         --          --            46,533     --
  Options written...................................................     --         --          --            46,533        637
Currency swap agreements:
  Commitments to pay................................................     64,817      4,821       3,193        55,725     --
  Commitments to receive............................................     38,417      1,628       1,595        55,725      5,971
Interest rate contracts:
  Caps purchased....................................................    994,605      1,858       1,837     1,189,791        796
  Floors purchased..................................................    147,250      1,149       1,149       119,000        612
  Caps written......................................................    994,605         21      (1,838)    1,189,791     --
  Floors written....................................................    147,250     --          (1,149)      119,000         --
Swap contracts:
  Pay variable/receive variable.....................................     10,000         28           1        58,000        301
  Pay fixed/receive variable........................................    788,165      1,064     (17,592)      976,180        364
  Pay variable/receive fixed........................................    788,165     19,623      18,674       976,180     30,240
 
<CAPTION>
 
                                                                       ESTIMATED
(DOLLARS IN THOUSANDS)                                                FAIR VALUE
- --------------------------------------------------------------------  -----------
<S>                                                                   <C>
HELD OR WRITTEN FOR TRADING PURPOSES AND CUSTOMER ACCOMMODATIONS
Foreign exchange forward contracts:
  Commitments to purchase...........................................   $ (34,304)
  Commitments to sell...............................................      40,274
Foreign exchange OTC options:
  Options purchased.................................................        (634)
  Options written...................................................         637
Currency swap agreements:
  Commitments to pay................................................      (5,971)
  Commitments to receive............................................       5,971
Interest rate contracts:
  Caps purchased....................................................         796
  Floors purchased..................................................         612
  Caps written......................................................        (796)
  Floors written....................................................        (612)
Swap contracts:
  Pay variable/receive variable.....................................      --
  Pay fixed/receive variable........................................     (29,579)
  Pay variable/receive fixed........................................      29,926
</TABLE>
 
- ------------------------------
 
(1) Credit risk amounts reflect the replacement cost for those contracts in a
    gain position in the event of nonperformance by counterparties.
 
    ASSET AND LIABILITY MANAGEMENT DERIVATIVE INSTRUMENTS
 
    Derivative positions are integral components of the Company's designated
asset and liability management activities. Therefore, the Company does not
believe it is meaningful to separately analyze the derivatives component of its
risk management activities in isolation from related positions. The Company uses
interest rate derivative instruments as part of its management of asset and
liability positions. Derivatives are used to manage interest rate risk relating
to specified groups of assets and liabilities, including LIBOR based commercial
loans, deposit liabilities and certain subordinated capital notes. The Company
uses foreign currency forward contracts as a means of managing foreign exchange
rate risk associated with assets or liabilities denominated in foreign
currencies.
 
    The following table reflects summary information on derivative contracts
used to hedge or modify the Company's risk as of December 31, 1996 and 1997.
Amounts included in the fair value column do not include gains or losses from
changes in the value of the underlying asset or liability being hedged. Notional
amounts are not exchanged, but serve as a point of reference for calculating
payments. For interest rate swap, cap and floor agreements, notional amounts do
not represent exposure to credit or market risk.
 
                                      F-37
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 14 -- DERIVATIVE INSTRUMENTS AND OTHER FINANCIAL INSTRUMENTS WITH
          OFF-BALANCE SHEET RISK (CONTINUED)
<TABLE>
<CAPTION>
                                                                          DECEMBER 31,
                                      ------------------------------------------------------------------------------------
                                                               1996                                       1997
                                      ------------------------------------------------------  ----------------------------
                                                     UNAMORTIZED                                             UNAMORTIZED
                                       NOTIONAL     PREMIUM PAID      CREDIT      ESTIMATED    NOTIONAL     PREMIUM PAID
(DOLLARS IN THOUSANDS)                  AMOUNTS      (RECEIVED)       RISK(1)    FAIR VALUE     AMOUNTS      (RECEIVED)
- ------------------------------------  -----------  ---------------  -----------  -----------  -----------  ---------------
<S>                                   <C>          <C>              <C>          <C>          <C>          <C>
HELD FOR ASSET AND LIABILITY
  MANAGEMENT PURPOSES
Foreign exchange forward contracts:
  Commitments to purchase...........  $   129,264     $  --          $   1,628    $  (2,286)  $   341,298     $  --
  Commitments to sell...............        4,142        --                 52           22        51,754        --
Currency swap agreements:
  Commitments to pay................      --             --             --           --            26,400        --
Interest rate contracts:
  Caps purchased....................       15,740        --             --           --            15,420        --
  Floors purchased..................    2,050,000         6,309          9,750        9,750     3,550,000        11,730
  Caps written......................      250,000          (709)           509          509       250,000          (335)
  Floors written....................      500,000        (1,016)           391          391     1,850,000          (534)
Swap contracts:
  Pay fixed/receive variable........      114,086        --                241         (851)      --             --
  Pay variable/receive fixed........      847,000        --              3,775        2,398       575,000        --
 
<CAPTION>
 
                                        CREDIT      ESTIMATED
(DOLLARS IN THOUSANDS)                  RISK(1)    FAIR VALUE
- ------------------------------------  -----------  -----------
<S>                                   <C>          <C>
HELD FOR ASSET AND LIABILITY
  MANAGEMENT PURPOSES
Foreign exchange forward contracts:
  Commitments to purchase...........   $     862    $  (5,055)
  Commitments to sell...............          35         (822)
Currency swap agreements:
  Commitments to pay................       2,590        2,590
Interest rate contracts:
  Caps purchased....................      --           --
  Floors purchased..................       4,040        4,040
  Caps written......................         273          273
  Floors written....................      --           (1,309)
Swap contracts:
  Pay fixed/receive variable........      --           --
  Pay variable/receive fixed........       2,302        2,302
</TABLE>
 
- ------------------------------
 
(1) Credit risk amounts reflect the replacement cost for those contracts in a
    gain position in the event of nonperformance by counterparties.
 
                                      F-38
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 14 -- DERIVATIVE INSTRUMENTS AND OTHER FINANCIAL INSTRUMENTS WITH
          OFF-BALANCE SHEET RISK (CONTINUED)
 
    OTHER FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK
 
    Commitments to extend credit are legally binding agreements to lend to a
customer provided there are no violations of any condition established in the
contract. Commitments have fixed expiration dates or other termination clauses
and may require payment of a fee or maintenance of compensatory balances. Such
fees are deferred and, upon partial or full exercise of the commitment,
amortized over the life of the loan or, if exercise is deemed remote, amortized
over the commitment period. Since many of the commitments are expected to expire
without being drawn upon, the contractual amounts do not necessarily represent
future cash requirements. With respect to commitments to extend credit and
letters of credit, the Company's exposure to credit risk in the event of
nonperformance by customers is represented by the contractual amount of those
instruments.
 
    Standby letters of credit are provided to customers to assure their
performance to a third party, generally in the production of goods and services
or under contractual commitments in the financial markets. Commercial letters of
credit are issued to customers to facilitate foreign or domestic trade
transactions. The Company charges fees for the issuance of standby and
commercial letters of credit. The majority of these type of commitments have
terms of one year or less and any fees charged are recognized as noninterest
income upon extension of the commitment. The credit risk involved in issuing
letters of credit is essentially the same as that involved in extending loan
facilities to customers and is represented by the contractual amount of those
instruments. When deemed necessary, the Company holds appropriate collateral
supporting those commitments. Management does not anticipate any material losses
as a result of these transactions.
 
    The Company uses the same credit underwriting policies in granting or
accepting such commitments or contingent obligations as it does for on-balance
sheet instruments, by evaluating customers' credit-worthiness. The amount of
collateral obtained, if deemed necessary by the Company upon extension of
credit, is based on management's evaluation of the customer. The nature of the
collateral varies but may include deposits held in financial institutions,
marketable securities, accounts receivable, inventory, property, equipment and
real estate. The Company also provides for potential losses from either
commitments to extend credit or standby letters of credit as a component of its
evaluation in determination of the adequacy of its allowance for credit losses
and resulting level of provision charged against current period earnings.
 
    The Company's pricing of these financial instruments is based on the credit
quality and other covenants or requirements. Management believes that the
current fees assessed on these off-balance sheet items represent market rates
which would be charged for similar agreements. Based on this belief, the Company
feels that the carrying amounts are reasonable estimates of the fair value of
these financial instruments. At
 
                                      F-39
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 14 -- DERIVATIVE INSTRUMENTS AND OTHER FINANCIAL INSTRUMENTS WITH
          OFF-BALANCE SHEET RISK (CONTINUED)
December 31, 1996 and 1997, fair value represents management's estimate of the
unamortized fee income associated with these instruments. The following is a
summary of other financial instruments with off-balance sheet risk.
 
<TABLE>
<CAPTION>
                                                                                   DECEMBER 31,
                                                                --------------------------------------------------
                                                                          1996                      1997
                                                                ------------------------  ------------------------
                                                                 CONTRACTUAL     FAIR      CONTRACTUAL     FAIR
(DOLLARS IN THOUSANDS)                                             AMOUNTS       VALUE       AMOUNTS       VALUE
- --------------------------------------------------------------  -------------  ---------  -------------  ---------
<S>                                                             <C>            <C>        <C>            <C>
Commitments to extend credit..................................  $  12,500,677  $   6,185  $  15,111,062  $  27,571
Standby letters of credit.....................................      2,610,123      2,808      2,289,878      5,776
Other letters of credit.......................................        336,101     --            314,594     --
</TABLE>
 
    The Company conducts securities lending transactions for institutional
customers as a fully disclosed agent, and, at times, indemnifies its customers
against counterparty default. All lending transactions are collateralized,
primarily by cash. The amount of securities lent with indemnification was $1,170
million and $1,268 million at December 31, 1996 and 1997, respectively. The
market value of the associated collateral was $1,195 million and $1,294 million
at December 31, 1996 and 1997, respectively.
 
NOTE 15 -- RESTRICTIONS ON CASH AND DUE FROM BANKS, SECURITIES, LOANS AND
          DIVIDENDS
 
    Federal Reserve Board regulations require the Bank to maintain reserve
balances based on the types and amounts of deposits received. Average reserve
balances were approximately $291 million and $339 million for the periods ended
December 31, 1996 and 1997, respectively.
 
    As of December 31, 1996 and 1997, securities carried at $1.7 billion for
each of the periods, and loans of $1.8 billion and $2.7 billion, respectively,
were pledged as collateral for borrowings, to secure public and trust department
deposits, and for repurchase agreements as required by contract or law.
 
    The Federal Reserve Act restricts the extension of credit by the Bank to BTM
and affiliates and to UnionBanCal Corporation and its non-bank subsidiaries and
requires that such loans be secured by certain types of collateral. At December
31, 1997, such extensions of credit were not material.
 
    The payment of dividends by the Bank to UnionBanCal Corporation is subject
to the approval of the Office of the Comptroller of the Currency (OCC) if the
total of all dividends declared in any calendar year exceeds certain calculated
amounts. The payment of dividends is also limited by minimum capital
requirements imposed on national banks by the OCC. At December 31, 1997, the
Bank could have declared dividends aggregating $170 million without prior
regulatory approval.
 
NOTE 16 -- REGULATORY CAPITAL REQUIREMENTS
 
    The Company and the Bank are subject to various regulatory capital
requirements administered by the federal banking agencies, including minimum
capital requirements. Failure to meet minimum capital requirements can initiate
certain mandatory, and possibly additional discretionary, actions by regulators
that, if undertaken, could have a direct material effect on the Company's
Consolidated Financial Statements.
 
                                      F-40
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 16 -- REGULATORY CAPITAL REQUIREMENTS (CONTINUED)
Under capital adequacy guidelines and the regulatory framework for prompt
corrective action, the Company and the Bank must meet specific capital
guidelines that involve quantitative measures of the Company's and Bank's
assets, liabilities, and certain off-balance sheet items as calculated under
regulatory accounting practices. The Company's and the Bank's capital amounts
and the Bank's prompt corrective action classification are also subject to
qualitative judgments by the regulators about components, risk weightings and
other factors.
 
    Quantitative measures established by regulation to ensure capital adequacy
require the Company and the Bank to maintain minimum amounts and ratios (set
forth in the table below) of total and Tier 1 capital (as defined in the
regulations) to risk-weighted assets (as defined) and of Tier 1 capital (as
defined) to average assets (as defined). Management believes, as of December 31,
1997, that the Company and the Bank meet all capital adequacy requirements to
which they are subject.
 
    As of December 31, 1996, and 1997, the most recent notification from the OCC
categorized the Bank as "well capitalized" under the regulatory framework for
prompt corrective action. To be categorized as "well capitalized", the Bank must
maintain minimum total risk-based, Tier 1 risk-based and Tier 1 leverage ratios
as set forth in the table. There are no conditions or events since that
notification that management believes have changed the Bank's category.
 
    The Company's and the Bank's capital amounts and ratios are presented in the
following tables.
 
<TABLE>
<CAPTION>
                                                                                       FOR CAPITAL
                                               ACTUAL                               ADEQUACY PURPOSES
                                          -----------------                   ------------------------------
(DOLLARS IN THOUSANDS)                      AMOUNT    RATIO                AMOUNT                           RATIO
- ----------------------------------------  ----------  -----  ----------------------------------  ----------------------------
<S>                                       <C>         <C>    <C>                                 <C>
CAPITAL RATIOS FOR THE COMPANY:
As of December 31, 1996:
  Total capital (to risk-weighted
   assets)..............................  $2,946,654  11.17%   greater than/equal to $2,111,223     greater than/equal to 8.0%
  Tier 1 capital (to risk-weighted
   assets)..............................   2,395,580   9.08    greater than/equal to  1,055,612     greater than/equal to 4.0
  Tier 1 capital (to quarterly average
   assets)(1)...........................   2,395,580   8.41    greater than/equal to  1,139,855     greater than/equal to 4.0
As of December 31, 1997:
  Total capital (to risk-weighted
   assets)..............................  $3,188,173  11.05%   greater than/equal to $2,308,988     greater than/equal to 8.0%
  Tier 1 capital (to risk-weighted
   assets)..............................   2,587,071   8.96    greater than/equal to  1,154,494     greater than/equal to 4.0
  Tier 1 capital (to quarterly average
   assets)(1)...........................   2,587,071   8.53    greater than/equal to  1,213,381     greater than/equal to 4.0
</TABLE>
 
- ------------------------
(1) Excludes certain intangible assets.
 
                                      F-41
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 16 -- REGULATORY CAPITAL REQUIREMENTS (CONTINUED)
<TABLE>
<CAPTION>
                                                                                        FOR CAPITAL
                                               ACTUAL                                ADEQUACY PURPOSES
                                          -----------------                     ---------------------------
(DOLLARS IN THOUSANDS)                      AMOUNT    RATIO               AMOUNT                            RATIO
- ----------------------------------------  ----------  -----  ---------------------------------  ------------------------------
<S>                                       <C>         <C>    <C>                                <C>
CAPITAL RATIOS FOR THE BANK:
As of December 31, 1996:
  Total capital
    (to risk-weighted assets)...........  $2,746,285  10.51%  greater than/equal to $2,090,910       greater than/equal to 8.0%
  Tier 1 capital
    (to risk-weighted assets)...........   2,208,392   8.45   greater than/equal to  1,045,455       greater than/equal to 4.0
  Tier 1 capital
    (to quarterly average assets)(1)....   2,208,392   7.76   greater than/equal to  1,138,211       greater than/equal to 4.0
As of December 31, 1997:
  Total capital
    (to risk-weighted assets)...........  $3,025,030  10.58%  greater than/equal to $2,286,296       greater than/equal to 8.0%
  Tier 1 capital
    (to risk-weighted assets)...........   2,527,468   8.84   greater than/equal to  1,143,148       greater than/equal to 4.0
  Tier 1 capital
    (to quarterly average assets)(1)....   2,527,468   8.35   greater than/equal to  1,210,898       greater than/equal to 4.0
 
<CAPTION>
 
                                          TO BE WELL CAPITALIZED UNDER PROMPT CORRECTIVE ACTION PROVISIONS
 
                                                            ----------------------------
(DOLLARS IN THOUSANDS)                                 AMOUNT                            RATIO
 
- ----------------------------------------  ---------------------------------  ------------------------------
 
<S>                                       <C>                                <C>
CAPITAL RATIOS FOR THE BANK:
As of December 31, 1996:
  Total capital
    (to risk-weighted assets)...........   greater than/equal to $2,613,638      greater than/equal to 10.0%
 
  Tier 1 capital
    (to risk-weighted assets)...........   greater than/equal to  1,568,183      greater than/equal to  6.0
 
  Tier 1 capital
    (to quarterly average assets)(1)....   greater than/equal to  1,422,764      greater than/equal to  5.0
 
As of December 31, 1997:
  Total capital
    (to risk-weighted assets)...........   greater than/equal to $2,857,870      greater than/equal to 10.0%
 
  Tier 1 capital
    (to risk-weighted assets)...........   greater than/equal to  1,714,722      greater than/equal to  6.0
 
  Tier 1 capital
    (to quarterly average assets)(1)....   greater than/equal to  1,513,622      greater than/equal to  5.0
 
</TABLE>
 
- ------------------------
(1) Excludes certain intangible assets.
 
NOTE 17 -- EARNINGS PER SHARE
 
    Basic EPS is computed by dividing net income after preferred dividends by
the weighted average number of common shares outstanding during the period.
Diluted EPS is computed based on the weighted average number of common shares
outstanding adjusted for common stock equivalents, which include stock options.
The following table presents a reconciliation of basic and diluted EPS for years
ended December 31, 1995, 1996 and 1997 and for the nine months ended September
30, 1997 and 1998 in accordance with SFAS No. 128:
 
                                      F-42
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 17 -- EARNINGS PER SHARE (CONTINUED)
 
<TABLE>
<CAPTION>
                                                                 YEARS ENDED DECEMBER 31,
                                          ----------------------------------------------------------------------
                                                   1995                    1996                    1997
(AMOUNTS IN THOUSANDS, EXCEPT PER SHARE   ----------------------  ----------------------  ----------------------
DATA)                                       BASIC      DILUTED      BASIC      DILUTED      BASIC      DILUTED
- ----------------------------------------  ----------  ----------  ----------  ----------  ----------  ----------
<S>                                       <C>         <C>         <C>         <C>         <C>         <C>
Net Income..............................  $  312,942  $  312,942  $  249,458  $  249,458  $  411,296  $  411,296
Less:
  Preferred stock dividends.............     (11,305)    (11,305)    (11,306)    (11,306)     (7,600)     (7,600)
                                          ----------  ----------  ----------  ----------  ----------  ----------
Income available to common
  shareholders..........................  $  301,637  $  301,637  $  238,152  $  238,152  $  403,696  $  403,696
                                          ----------  ----------  ----------  ----------  ----------  ----------
                                          ----------  ----------  ----------  ----------  ----------  ----------
Weighted average common shares
  outstanding...........................     173,806     173,806     174,391     174,391     174,683     174,683
Additional shares due to:
  Assumed conversion of dilutive stock
   options..............................      --             293      --             393      --             506
                                          ----------  ----------  ----------  ----------  ----------  ----------
Adjusted weighted average common shares
  outstanding...........................     173,806     174,099     174,391     174,784     174,683     175,189
                                          ----------  ----------  ----------  ----------  ----------  ----------
                                          ----------  ----------  ----------  ----------  ----------  ----------
Net income per share....................  $     1.74  $     1.73  $     1.37  $     1.36  $     2.31  $     2.30
                                          ----------  ----------  ----------  ----------  ----------  ----------
                                          ----------  ----------  ----------  ----------  ----------  ----------
</TABLE>
 
<TABLE>
<CAPTION>
                                                                          NINE MONTHS ENDED SEPTEMBER 30,
                                                                   ----------------------------------------------
                                                                            1997                    1998
                                                                   ----------------------  ----------------------
                                                                        (UNAUDITED)             (UNAUDITED)
                                                                   ----------------------  ----------------------
(AMOUNTS IN THOUSANDS, EXCEPT PER SHARE DATA)                        BASIC      DILUTED      BASIC      DILUTED
- -----------------------------------------------------------------  ----------  ----------  ----------  ----------
<S>                                                                <C>         <C>         <C>         <C>
Net Income.......................................................  $  318,851  $  318,851  $  352,365  $  352,365
Less:
  Preferred stock dividends......................................      (7,600)     (7,600)     --          --
                                                                   ----------  ----------  ----------  ----------
Income available to common shareholders..........................  $  311,251  $  311,251  $  352,365  $  352,365
                                                                   ----------  ----------  ----------  ----------
                                                                   ----------  ----------  ----------  ----------
Weighted average common shares outstanding.......................     174,615     174,615     175,091     175,091
Additional shares due to:
  Assumed conversion of dilutive stock options...................      --             456      --             638
                                                                   ----------  ----------  ----------  ----------
Adjusted weighted average common shares outstanding..............     174,615     175,071     175,091     175,729
                                                                   ----------  ----------  ----------  ----------
                                                                   ----------  ----------  ----------  ----------
Net income per share.............................................  $     1.78  $     1.78  $     2.01  $     2.01
                                                                   ----------  ----------  ----------  ----------
                                                                   ----------  ----------  ----------  ----------
</TABLE>
 
- ------------------------
 
    Options to purchase 277,200 shares of common stock at $18 per share were
outstanding but not included in the computation of diluted EPS in 1996 because
the options were anti-dilutive. Options to purchase 422,400 shares of common
stock at $22 per share and options to purchase 527,550 shares of common stock at
$35 per share were outstanding but not included in the computation of diluted
EPS for the nine months ended September 30, 1997 and 1998, respectively, because
the options were anti-dilutive.
 
                                      F-43
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 18 -- COMPREHENSIVE INCOME
 
    The following is a summary of the components of accumulated other
comprehensive income:
 
<TABLE>
<CAPTION>
                                                                                             FOR THE NINE MONTHS
                                                            YEARS ENDED DECEMBER 31,         ENDED SEPTEMBER 30,
                                                       ----------------------------------  -----------------------
(DOLLARS IN THOUSANDS)                                    1995        1996        1997        1997         1998
- -----------------------------------------------------  ----------  ----------  ----------  -----------  ----------
                                                                                                 (UNAUDITED)
<S>                                                    <C>         <C>         <C>         <C>          <C>
Net unrealized gain (loss) on securities available
  for sale, net of reclassification adjustment:
  Beginning balance..................................  $   (8,838) $   24,900  $   14,064   $  14,064   $   19,886
    Net unrealized gain (loss) on securities
     available for sale during the period, before
     tax.............................................      53,890     (13,409)     11,908      10,626       41,378
  Income tax (expense) benefit.......................     (20,586)      5,297      (4,370)     (4,229)     (15,766)
  Less: reclassification adjustment for net realized
   (gain) loss on securities available for sale
   included in net income during the period, before
   tax...............................................         702      (4,502)     (2,711)     (2,098)      (5,579)
  Plus: income tax expense (benefit).................        (268)      1,778         995         857        1,960
                                                       ----------  ----------  ----------  -----------  ----------
Net activity.........................................      33,738     (10,836)      5,822       5,156       21,993
                                                       ----------  ----------  ----------  -----------  ----------
Ending balance.......................................      24,900      14,064      19,886      19,220       41,879
                                                       ----------  ----------  ----------  -----------  ----------
Foreign currency translation adjustments:
  Beginning balance..................................      (1,092)     (1,240)     (3,183)     (3,183)     (12,458)
  Foreign currency translation adjustments during the
   period, before tax................................        (239)     (3,212)    (14,652)     (2,785)        (153)
  Income tax benefit.................................          91       1,269       5,377       1,128           62
                                                       ----------  ----------  ----------  -----------  ----------
Net activity.........................................        (148)     (1,943)     (9,275)     (1,657)         (91)
                                                       ----------  ----------  ----------  -----------  ----------
Ending balance.......................................      (1,240)     (3,183)    (12,458)     (4,840)     (12,549)
                                                       ----------  ----------  ----------  -----------  ----------
Other comprehensive income...........................  $   33,590  $  (12,779) $   (3,453)  $   3,499   $   21,902
                                                       ----------  ----------  ----------  -----------  ----------
                                                       ----------  ----------  ----------  -----------  ----------
Accumulated other comprehensive income...............  $   23,660  $   10,881  $    7,428   $  14,380   $   29,330
                                                       ----------  ----------  ----------  -----------  ----------
                                                       ----------  ----------  ----------  -----------  ----------
</TABLE>
 
NOTE 19 -- CONTINGENCIES
 
    The Company is subject to various pending and threatened legal actions which
arise in the normal course of business. The Company maintains reserves for
losses from legal actions which are both probable and estimable. In the opinion
of management, the disposition of claims currently pending will not have a
material adverse effect on the Company's financial position or results of
operations.
 
                                      F-44
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 20 -- TRANSACTIONS WITH AFFILIATES
 
    The Company has had, and expects to have in the future, banking transactions
and other transactions in the ordinary course of business with BTM and with its
affiliates and associates. During the years ended December 31, 1995, 1996 and
1997, such transactions included, but were not limited to, origination,
participation, servicing and remarketing of loans and leases, purchase and sale
of acceptances and interest rate derivatives, foreign exchange transactions,
funds transfers, custodianships, electronic data processing, investment advice
and management, deposits and credit examination, and trust services. In the
opinion of management, such transactions were made at prevailing rates, terms
and conditions and do not involve more than the normal risk of collectibility or
present other unfavorable features. In addition, some compensation for services
rendered to the Company is paid to the expatriate officers from BTM, and
reimbursed by the Company to BTM under a services agreement.
 
NOTE 21 -- CONDENSED UNIONBANCAL CORPORATION UNCONSOLIDATED FINANCIAL STATEMENTS
 
CONDENSED BALANCE SHEETS
 
<TABLE>
<CAPTION>
                                                                                               DECEMBER 31,
                                                                                        --------------------------
(DOLLARS IN THOUSANDS)                                                                      1996          1997
- --------------------------------------------------------------------------------------  ------------  ------------
<S>                                                                                     <C>           <C>
ASSETS
  Cash and due from banks.............................................................  $    103,742  $     66,872
  Investment in and advances to subsidiaries..........................................     2,503,706     2,879,898
  Other assets........................................................................         9,161         7,971
                                                                                        ------------  ------------
    Total assets......................................................................  $  2,616,609  $  2,954,741
                                                                                        ------------  ------------
                                                                                        ------------  ------------
 
LIABILITIES AND SHAREHOLDERS' EQUITY
  Commercial paper....................................................................  $    --       $    --
  Subordinated capital notes..........................................................       100,000       250,000
  Other liabilities...................................................................        21,676        25,442
                                                                                        ------------  ------------
    Total liabilities.................................................................       121,676       275,442
  Shareholders' equity................................................................     2,494,933     2,679,299
                                                                                        ------------  ------------
    Total liabilities and shareholders' equity........................................  $  2,616,609  $  2,954,741
                                                                                        ------------  ------------
                                                                                        ------------  ------------
</TABLE>
 
                                      F-45
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 21 -- CONDENSED UNIONBANCAL CORPORATION UNCONSOLIDATED FINANCIAL STATEMENTS
          (CONTINUED)
CONDENSED STATEMENTS OF INCOME
 
<TABLE>
<CAPTION>
                                                                                    YEARS ENDED DECEMBER 31,
                                                                               ----------------------------------
(DOLLARS IN THOUSANDS)                                                            1995        1996        1997
- -----------------------------------------------------------------------------  ----------  ----------  ----------
<S>                                                                            <C>         <C>         <C>
INCOME:
  Dividends from bank subsidiary.............................................  $   25,062  $  270,662  $   85,660
  Dividends from nonbank subsidiaries........................................         343         421      --
  Interest income on advances to subsidiaries and deposits in bank...........      52,289      24,366      12,217
  Other income...............................................................      --             959       1,040
                                                                               ----------  ----------  ----------
    Total income.............................................................      77,694     296,408      98,917
 
EXPENSE:
  Interest expense...........................................................      54,133      22,220      11,174
  Other expense, net.........................................................        (212)      1,072       1,583
                                                                               ----------  ----------  ----------
      Total expense..........................................................      53,921      23,292      12,757
                                                                               ----------  ----------  ----------
Income before income taxes and equity in undistributed net income of
  subsidiaries...............................................................      23,773     273,116      86,160
Income tax expense (benefit).................................................        (694)        889         204
                                                                               ----------  ----------  ----------
Income before equity in undistributed net income of subsidiaries.............      24,467     272,227      85,956
Equity in undistributed net income (loss) of subsidiaries:
  Bank subsidiary(1).........................................................     285,053     (32,894)    314,739
  Nonbank subsidiaries.......................................................       3,422      10,125      10,601
                                                                               ----------  ----------  ----------
NET INCOME...................................................................  $  312,942  $  249,458  $  411,296
                                                                               ----------  ----------  ----------
                                                                               ----------  ----------  ----------
</TABLE>
 
- ------------------------
 
(1) In 1996 the amount represents dividends distributed by the Bank in excess of
    its 1996 net income.
 
                                      F-46
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 21 -- CONDENSED UNIONBANCAL CORPORATION UNCONSOLIDATED FINANCIAL STATEMENTS
          (CONTINUED)
CONDENSED STATEMENTS OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                                                   YEARS ENDED DECEMBER 31,
                                                                              ----------------------------------
(DOLLARS IN THOUSANDS)                                                           1995        1996        1997
- ----------------------------------------------------------------------------  ----------  ----------  ----------
<S>                                                                           <C>         <C>         <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net income................................................................  $  312,942  $  249,458  $  411,296
  Adjustments to reconcile net income to net cash provided by operating
   activities:
    Equity in undistributed (earnings) losses of subsidiaries...............    (288,475)     22,769    (325,340)
    Other, net..............................................................       2,800      (3,772)      1,059
                                                                              ----------  ----------  ----------
      Net cash provided by operating activities.............................      27,267     268,455      87,015
 
CASH FLOWS FROM INVESTING ACTIVITIES:
  Advances to subsidiaries..................................................      33,590     (12,779)   (130,805)
  Repayment of advances to subsidiaries.....................................      70,000      70,000      76,104
  Sales and maturities of securities........................................      11,650         322      --
                                                                              ----------  ----------  ----------
      Net cash provided (used) by investing activities......................     115,240      57,543     (54,701)
 
CASH FLOWS FROM FINANCING ACTIVITIES:
  Net increase (decrease) in short term borrowings..........................         366    (632,296)     --
  Proceeds from reduction of investment in subsidiary equity................      --           3,966      --
  Maturity and redemption of subordinated capital notes and long term
   debt.....................................................................     (70,000)    (70,000)    (50,000)
  Proceeds from issuance of subordinated capital notes......................      --          --         200,000
  Payments of cash dividends................................................     (62,044)   (182,652)    (93,303)
  Redemption of preferred stock.............................................      --          --        (135,000)
  Other, net................................................................       3,392      17,813       9,119
                                                                              ----------  ----------  ----------
      Net cash used by financing activities.................................    (128,286)   (863,169)    (69,184)
                                                                              ----------  ----------  ----------
  Net increase (decrease) in cash and due from banks........................      14,221    (537,171)    (36,870)
  Cash and due from banks at beginning of year..............................     626,692     640,913     103,742
                                                                              ----------  ----------  ----------
      Cash and due from banks at end of year................................  $  640,913  $  103,742  $   66,872
                                                                              ----------  ----------  ----------
                                                                              ----------  ----------  ----------
CASH PAID (RECEIVED) DURING THE YEAR FOR:
  Interest..................................................................  $   52,847  $   25,785  $    9,814
  Income taxes..............................................................      (2,030)       (198)      1,148
SUPPLEMENTAL SCHEDULE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
  Dividends declared but unpaid.............................................  $   12,788  $   20,383  $   24,528
</TABLE>
 
                                      F-47
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 22 -- SUMMARY OF QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
 
    Certain amounts in the following unaudited quarterly financial information
have been reclassified to conform with current presentation. In the opinion of
management, all adjustments necessary to fairly present the results of
operations have been made.
 
<TABLE>
<CAPTION>
                                                                              1996 QUARTERS ENDED
                                                              ---------------------------------------------------
(DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)                  MARCH 31    JUNE 30    SEPTEMBER 30   DECEMBER 31
- ------------------------------------------------------------  ----------  ----------  -------------  ------------
<S>                                                           <C>         <C>         <C>            <C>
Interest income.............................................  $  483,068  $  473,601   $   481,315    $  489,320
Interest expense............................................     187,401     185,362       189,727       196,236
                                                              ----------  ----------  -------------  ------------
Net interest income.........................................     295,667     288,239       291,588       293,084
Provision for credit losses.................................      10,000      10,000        10,000        10,000
Noninterest income..........................................     102,874     105,550       107,280       102,972
Noninterest expense.........................................     252,024     313,784       284,075       285,021
                                                              ----------  ----------  -------------  ------------
Income before income taxes..................................     136,517      70,005       104,793       101,035
Income tax expense..........................................      53,251      25,597        42,810        41,234
                                                              ----------  ----------  -------------  ------------
Net income..................................................  $   83,266  $   44,408   $    61,983    $   59,801
                                                              ----------  ----------  -------------  ------------
                                                              ----------  ----------  -------------  ------------
Net income applicable to common stock.......................  $   80,440  $   41,582   $    59,156    $   56,975
                                                              ----------  ----------  -------------  ------------
                                                              ----------  ----------  -------------  ------------
Net income per common share -- basic........................  $     0.46  $     0.24   $      0.34    $     0.33
                                                              ----------  ----------  -------------  ------------
                                                              ----------  ----------  -------------  ------------
Net income per common share -- diluted......................  $     0.46  $     0.24   $      0.34    $     0.33
                                                              ----------  ----------  -------------  ------------
                                                              ----------  ----------  -------------  ------------
Dividends per common share(1)(2)............................  $     0.12  $     0.12   $      0.12    $     0.12
                                                              ----------  ----------  -------------  ------------
                                                              ----------  ----------  -------------  ------------
</TABLE>
 
                                      F-48
<PAGE>
                    UNIONBANCAL CORPORATION AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                         DECEMBER 31, 1995, 1996, 1997,
                            AND CONDENSED NOTES FOR
              SEPTEMBER 30, 1997 (UNAUDITED) AND 1998 (UNAUDITED)
 
NOTE 22 -- SUMMARY OF QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (CONTINUED)
<TABLE>
<CAPTION>
                                                                              1997 QUARTERS ENDED
                                                              ---------------------------------------------------
(DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)                  MARCH 31    JUNE 30    SEPTEMBER 30   DECEMBER 31
- ------------------------------------------------------------  ----------  ----------  -------------  ------------
<S>                                                           <C>         <C>         <C>            <C>
Interest income.............................................  $  485,031  $  504,663   $   520,237    $  523,530
Interest expense............................................     191,000     197,647       207,983       205,149
                                                              ----------  ----------  -------------  ------------
Net interest income.........................................     294,031     307,016       312,254       318,381
Provision for credit losses.................................      --          --           --             --
Noninterest income..........................................     114,786     111,021       116,820       120,374
Noninterest expense.........................................     253,138     255,753       253,317       282,457
                                                              ----------  ----------  -------------  ------------
Income before income taxes..................................     155,679     162,284       175,757       156,298
Income tax expense..........................................      63,177      65,739        45,953        63,853
                                                              ----------  ----------  -------------  ------------
Net income..................................................  $   92,502  $   96,545   $   129,804    $   92,445
                                                              ----------  ----------  -------------  ------------
                                                              ----------  ----------  -------------  ------------
Net income applicable to common stock.......................  $   89,676  $   93,718   $   127,857    $   92,445
                                                              ----------  ----------  -------------  ------------
                                                              ----------  ----------  -------------  ------------
Net income per common share -- basic........................  $     0.51  $     0.54   $      0.73    $     0.53
                                                              ----------  ----------  -------------  ------------
                                                              ----------  ----------  -------------  ------------
Net income per common share -- diluted......................  $     0.51  $     0.54   $      0.73    $     0.53
                                                              ----------  ----------  -------------  ------------
                                                              ----------  ----------  -------------  ------------
Dividends per common share(1)...............................  $     0.12  $     0.12   $      0.14    $     0.14
                                                              ----------  ----------  -------------  ------------
                                                              ----------  ----------  -------------  ------------
</TABLE>
 
- ------------------------
 
(1) Dividends per share for 1996 and 1997 are based on the Company's common
    stock outstanding as of the declaration date.
 
(2) Amounts prior to merger are based on Union Bank only and do not include the
    dividend of $145 million paid to The Mitsubishi Bank, Limited in the first
    quarter of 1996 by BanCal Tri-State Corporation and The Bank of California,
    N.A.
 
                                      F-49
<PAGE>
                          INDEPENDENT AUDITORS' REPORT
 
To the Shareholders and Directors of UnionBanCal Corporation:
 
We have audited the accompanying consolidated balance sheets of UnionBanCal
Corporation and subsidiaries as of December 31, 1996 and 1997, and the related
consolidated statements of income, changes in shareholders' equity, and cash
flows for each of the three years in the period ended December 31, 1997. These
financial statements are the responsibility of the Company's management. Our
responsibility is to express an opinion on these financial statements based on
our audits. The consolidated financial statements give retroactive effect to the
merger of BanCal Tri-State Corporation and Union Bank on April 1, 1996, which
has been accounted for as a pooling of interests as described in Note 1 to the
consolidated financial statements. We did not audit the consolidated statements
of income, changes in shareholders' equity, and cash flows of Union Bank and
subsidiaries for the year ended December 31, 1995, which statements reflect
total net interest income and net income of $832 million and $207 million,
respectively. These statements were audited by other auditors whose report has
been furnished to us, and our opinion expressed herein, insofar as it relates to
the amounts included for Union Bank for 1995, is based solely upon the report of
such other auditors.
 
We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits and the report of the other auditors provide a
reasonable basis for our opinion.
 
In our opinion, based upon our audits and the report of the other auditors, the
consolidated financial statements referred to above present fairly, in all
material respects, the financial position of UnionBanCal Corporation and its
subsidiaries as of December 31, 1996 and 1997, and the results of their
operations and their cash flows for each of the three years in the period ended
December 31, 1997, in conformity with generally accepted accounting principles.
 
                     [SIG]
 
Deloitte & Touche LLP
San Francisco, California
January 30, 1998 (November 18, 1998 as to the exchange of
common shares referred to in Note 1, paragraphs 3 and 4, and
the adoption of SFAS No. 130, "Reporting Comprehensive Income",
referred to in Notes 1 and 18, and December 7, 1998 as to the stock split
referred to in Note 1, paragraph 5.)
 
                                      F-50
<PAGE>
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
To the Shareholders and Board of Directors of Union Bank:
 
We have audited the consolidated statement of income of Union Bank, a California
state chartered bank and a 71% owned subsidiary of The Bank of Tokyo, Ltd., and
subsidiaries ("the Bank") and the related consolidated statements of
shareholders' equity and cash flows for the year ended December 31, 1995 (not
presented herein). These financial statements are the responsibility of the
Bank's management. Our responsibility is to express an opinion on these
financial statements based on our audit.
 
We conducted our audit in accordance with generally accepted auditing standards.
Those standards require that we plan and perform the audit to obtain reasonable
assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audit provides a reasonable basis for our opinion.
 
In our opinion, the financial statements referred to above present fairly, in
all material respects, the results of operations and cash flows for the year
ended December 31, 1995, of Union Bank and subsidiaries, in conformity with
generally accepted accounting principles.
 
/s/ ARTHUR ANDERSEN LLP
 
San Francisco, California
January 24, 1996
 
                                      F-51
<PAGE>
   
                             SUBJECT TO COMPLETION
                 PRELIMINARY PROSPECTUS DATED JANUARY 11, 1999
    
THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED. THESE
SECURITIES MAY NOT BE SOLD UNTIL THE REGISTRATION STATEMENT FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER
TO SELL THESE SECURITIES AND THE COMPANY IS NOT SOLICITING AN OFFER TO BUY THESE
SECURITIES IN ANY STATE WHERE SUCH OFFER OF SALE IS NOT PERMITTED.
<PAGE>
PROSPECTUS
$750,000,000
 
<TABLE>
<S>                                            <C>
UNIONBANCAL CORPORATION                        UNIONBANCAL FINANCE TRUST I
                                               UNIONBANCAL FINANCE TRUST II
                                               UNIONBANCAL FINANCE TRUST III
                                               UNIONBANCAL FINANCE TRUST IV
 
COMMON STOCK, PREFERRED STOCK, DEPOSITARY
SHARES                                         TRUST PREFERRED SECURITIES GUARANTEED BY
AND DEBT SECURITIES                            UNIONBANCAL CORPORATION
</TABLE>
 
- --------------------------------------------------------------------------------
 
   
UNIONBANCAL CORPORATION
    
 
    - may sell common stock to the public;
 
    - may sell preferred stock to the public;
 
    - may sell depositary shares representing preferred stock to the public;
 
    - may sell debt securities to the public; and
 
    - will guarantee the payment by each trust of any trust preferred
      securities.
 
THE TRUSTS
 
    UnionBanCal Finance Trust I, UnionBanCal Finance Trust II, UnionBanCal
Finance Trust III and UnionBanCal Finance Trust IV are Delaware business trusts.
Each trust may:
 
   
    - sell trust preferred securities to the public;
    
 
   
    - sell trust common securities to UnionBanCal Corporation;
    
 
    - use the proceeds from these sales to buy an equal amount of debt
      securities of UnionBanCal Corporation; and
 
    - distribute the cash payments it receives on the debt securities it owns to
      the holders of the trust preferred and trust common securities.
 
    WE URGE YOU TO READ CAREFULLY THIS PROSPECTUS AND THE ACCOMPANYING
PROSPECTUS SUPPLEMENT, WHICH WILL DESCRIBE THE SPECIFIC TERMS OF THE SECURITIES
BEING OFFERED TO YOU, BEFORE YOU MAKE YOUR INVESTMENT DECISION.
 
   
INVESTING IN THE SECURITIES INVOLVES RISKS. SEE "RISK FACTORS" BEGINNING ON PAGE
                                       4
    
 
- --------------------------------------------------------------------------------
 
NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS
PROSPECTUS OR THE ACCOMPANYING PROSPECTUS SUPPLEMENT IS TRUTHFUL OR COMPLETE.
ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
- --------------------------------------------------------------------------------
 
    THIS PROSPECTUS MAY NOT BE USED TO SELL SECURITIES UNLESS ACCOMPANIED BY A
PROSPECTUS SUPPLEMENT.
 
   
                The date of this prospectus is            , 1999
    
<PAGE>
                               TABLE OF CONTENTS
   
<TABLE>
<CAPTION>
                                                    PAGE
                                                    -----
<S>                                              <C>
About This Prospectus..........................           2
 
Special Note Regarding Forward-Looking
  Statements...................................           2
 
UnionBanCal Corporation........................           3
 
Risk Factors...................................           4
 
The Trusts.....................................           8
 
Use of Proceeds................................           9
 
Ratio of Earnings to Combined Fixed Charges and
  Preferred Stock Dividends....................           9
 
Description of Securities......................          10
  Description of Capital Stock.................          10
  Description of Depositary Shares.............          11
 
<CAPTION>
                                                    PAGE
                                                    -----
<S>                                              <C>
 
  Description of the Trust Preferred
    Securities.................................          13
 
  Description of Debt Securities...............          19
 
  Description of the Trust Preferred Securities
    Guarantees.................................          28
 
Relationship Among the Trust Preferred
  Securities, the Trust Preferred Securities
  Guarantee and the Debt Securities Held by
  Each Trust...................................          31
 
Plan of Distribution...........................          31
 
Legal Opinion..................................          32
 
Experts........................................          32
 
Where You Can Find More Information............          33
</TABLE>
    
 
                             ABOUT THIS PROSPECTUS
 
   
    This prospectus is part of a registration statement that we and the trusts
filed with the Securities and Exchange Commission using a "shelf" registration
process. Under this shelf process, we may sell any combination of the securities
described in this prospectus in one or more offerings up to a total dollar
amount of $750,000,000. This prospectus provides you with a general description
of the securities we may offer. Each time we sell securities, we will provide a
prospectus supplement that will contain specific information about the terms of
that offering. The prospectus supplement may also add, update or change
information contained in this prospectus. You should read both this prospectus
and any prospectus supplement together with additional information described
under the heading "Where You Can Find More Information."
    
 
               SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS
 
   
    This prospectus or the information incorporated by reference herein includes
forward-looking statements within the meaning of Section 27A of the Securities
Act of 1933, and Section 21E of the Exchange Act. Some of the forward-looking
statements can be identified by the use of forward-looking words such as
"believes," "expects," "may," "will," "should," "seeks," "approximately,"
"intends," "plans," "estimates," or "anticipates" or the negative of those words
or other comparable terminology. Forward-looking statements involve inherent
risks and uncertainties. A number of important factors could cause actual
results to differ materially from those in the forward-looking statements. Some
factors include fluctuations in interest rates, inflation, government
regulations, and economic conditions and competition in the geographic and
business areas in which we conduct our operations. For a discussion of factors
that could cause actual results to differ, please see the discussion under "Risk
Factors" contained in this prospectus generally, in any prospectus supplement
related hereto, and in other information contained in our publicly available SEC
filings and press releases.
    
 
                                       2
<PAGE>
   
                            UNIONBANCAL CORPORATION
    
 
   
    UnionBanCal Corporation, or "UNBC," is a California-based commercial bank
holding company. Its principal subsidiary is Union Bank of California, N.A.
Union Bank of California is the third largest commercial bank in California,
based on both total assets and total deposits in California, and is among the 30
largest in the United States. Having roots as far back as 1864, we are among the
oldest banks on the West Coast. At September 30, 1998, we had 244 full-service
branches in California, six full-service branches in Oregon and Washington, two
facilities in Texas and New York and 18 offices abroad. Most of our customers
are located in California, the nation's most populous state with over 32 million
residents. Our bank was formed through the combination of Union Bank and BanCal
Tri-State Corporation in 1996. We are presently approximately 82% owned by The
Bank of Tokyo-Mitsubishi, Ltd.
    
 
   
    We provide a wide range of financial products and services to retail
customers, small businesses, middle-market companies and major corporations.
These products and services include a variety of personal and commercial
financial services, including:
    
 
   
    - consumer and small-business lending,
    
 
   
    - corporate and international lending,
    
 
   
    - corporate and international cash management,
    
 
   
    - treasury services,
    
 
   
    - trust services, and
    
 
   
    - investment advisory services.
    
 
   
    As of September 30, 1998, we had total assets of $31.4 billion, total
deposits of $23.7 billion and total shareholders' equity of $3.0 billion. We had
net income for the nine months ended September 30, 1998 of $352.4 million, and
net income per diluted share of $2.01 after giving effect to the December 1998
3-for-1 stock split.
    
 
                                       3
<PAGE>
                                  RISK FACTORS
 
    YOU SHOULD CAREFULLY CONSIDER THE FOLLOWING RISKS AS WELL AS THE OTHER
INFORMATION CONTAINED OR INCORPORATED BY REFERENCE IN THIS PROSPECTUS BEFORE
PURCHASING THE SECURITIES.
 
   
ADVERSE CALIFORNIA ECONOMIC CONDITIONS COULD ADVERSELY AFFECT OUR BUSINESS
    
 
   
    A substantial majority of our assets and deposits are generated in
California. As a result, poor economic conditions in California may cause us to
incur losses associated with higher default rates and decreased collateral
values in our loan portfolio. In the early 1990s, the California economy
experienced an economic recession that resulted in increases in the level of
delinquencies and losses for us and many of the state's financial institutions.
If California were to experience another recession, it is expected that our
level of problem assets would increase accordingly. The current economic crisis
in Asia is expected to continue to negatively impact the economic conditions in
California, which could adversely affect our business.
    
 
   
ADVERSE ECONOMIC FACTORS AFFECTING CERTAIN INDUSTRIES COULD HAVE AN ADVERSE
  EFFECT ON OUR CUSTOMERS AND THEIR ABILITY TO MAKE PAYMENTS TO US
    
 
    We are also subject to certain industry-specific economic factors. For
example, a portion of our total loan portfolio is related to real estate
obligations, and a portion of our recent growth has been fueled by the general
real estate recovery in California. Accordingly, a downturn in the real estate
industry in California could have an adverse effect on our operations.
Similarly, a portion of our total loan portfolio is to borrowers in the
agricultural industry. Last year's weather effects of "El Nino," combined with
low commodity prices, may adversely affect the agricultural industry and,
consequently, may impact our business negatively.
 
   
FLUCTUATIONS IN INTEREST RATES COULD ADVERSELY AFFECT OUR BUSINESS
    
 
   
    Significant increases in market interest rates, or the perception that an
increase may occur, could adversely affect both our ability to originate new
loans and our ability to grow. Conversely, a decrease in interest rates could
result in an acceleration in the prepayment of loans. In addition, changes in
market interest rates, or changes in the relationships between short-term and
long-term market interest rates, or changes in the relationships between
different interest rate indices, could affect the interest rates charged on
interest-earning assets differently than the interest rates paid on
interest-bearing liabilities. This difference could result in an increase in
interest expense relative to interest income. An increase in market interest
rates also could adversely affect the ability of our floating-rate borrowers to
meet their higher payment obligations. If this occurred, it could cause an
increase in non-performing assets and charge-offs, which could adversely affect
our business.
    
 
   
SHAREHOLDER VOTES ARE CONTROLLED BY THE BANK OF TOKYO-MITSUBISHI, LTD.
    
 
   
    The Bank of Tokyo-Mitsubishi owns a majority of the outstanding shares of
our common stock. As a result, The Bank of Tokyo-Mitsubishi can elect all of our
directors and can control the vote on all matters, including determinations such
as:
    
 
    - approval of mergers or other business combinations;
 
    - sales of all or substantially all of UNBC's assets;
 
    - any matters submitted to a vote of UNBC's shareholders;
 
    - issuance of any additional common stock or other equity securities;
 
    - incurrence of debt other than in the ordinary course of business;
 
                                       4
<PAGE>
    - the selection and tenure of the Chief Executive Officer of UNBC;
 
    - payment of dividends with respect to common stock or other equity
      securities; and
 
   
    - matters that might be favorable to The Bank of Tokyo-Mitsubishi.
    
 
   
    The Bank of Tokyo-Mitsubishi's ability to prevent an unsolicited bid for
UNBC or any other change in control could have an adverse effect on the market
price for our common stock and other UNBC securities. A majority of UNBC's
directors are not officers or employees of UNBC or any of its affiliates,
including The Bank of Tokyo-Mitsubishi. However, because of The Bank of
Tokyo-Mitsubishi's control over the election of our directors, The Bank of
Tokyo-Mitsubishi could change the composition of our Board of Directors so that
it would not have a majority of outside directors.
    
 
   
THE BANK OF TOKYO-MITSUBISHI'S FINANCIAL CONDITION COULD ADVERSELY AFFECT OUR
  OPERATIONS
    
 
   
    Although we fund our operations independently of The Bank of
Tokyo-Mitsubishi and believe our business is not necessarily closely related to
its business or outlook, its credit ratings may affect our credit ratings. The
Bank of Tokyo-Mitsubishi's credit ratings were downgraded in October 1998 by
Standard and Poor's Corporation and its credit ratings currently are on Moody's
Investors Service, Inc.'s credit watch with negative implications. Any future
downgrading of its credit rating could adversely affect our credit ratings.
Therefore, as long as The Bank of Tokyo-Mitsubishi maintains a majority interest
in UNBC, a deterioration in The Bank of Tokyo-Mitsubishi's financial condition
could result in an increase in our borrowing costs and could impair our access
to the public and private capital markets. The Bank of Tokyo-Mitsubishi is also
subject to regulatory oversight and review. Our business operations and
expansion plans could be negatively affected by regulatory concerns related to
the Japanese financial system and The Bank of Tokyo-Mitsubishi.
    
 
   
POTENTIAL CONFLICTS OF INTEREST WITH THE BANK OF TOKYO-MITSUBISHI, LTD. COULD
  ADVERSELY AFFECT US
    
 
   
    As part of The Bank of Tokyo-Mitsubishi's normal risk management processes,
it manages its global credit exposures and concentrations on an aggregate basis,
including UNBC. Therefore, at certain levels, our ability to approve certain
credits and categories of customers is subject to concurrence by The Bank of
Tokyo-Mitsubishi. We may wish to extend credit to the same customer as The Bank
of Tokyo-Mitsubishi. Our ability to do so may be limited for various reasons,
including The Bank of Tokyo-Mitsubishi's aggregate credit exposure and marketing
policies.
    
 
   
    Our directors' and officers' ownership interests in The Bank of
Tokyo-Mitsubishi's common stock or service as a director or officer or other
employee of both UNBC and The Bank of Tokyo-Mitsubishi could create or appear to
create potential conflicts of interest, especially since both of us compete in
the United States banking industry.
    
 
   
SUBSTANTIAL COMPETITION IN THE CALIFORNIA BANKING MARKET COULD ADVERSELY AFFECT
  US
    
 
   
    Banking is a highly competitive business. We compete actively for loan,
deposit, and other financial services business in California, as well as
nationally and internationally. Our competitors include a large number of state
and national banks, thrift institutions and major foreign-affiliated or foreign
banks, as well as many financial and nonfinancial firms that offer services
similar to those offered by us. Some of our competitors are community banks that
have strong local market positions. Other competitors include large financial
institutions (such as Bank of America, California Federal, Washington Mutual,
and Wells Fargo) that have substantial capital, technology and marketing
resources. Such large financial institutions may have greater access to capital
at a lower cost than UNBC, which may adversely affect our ability to compete
effectively.
    
 
   
    In addition, there have been a number of recent mergers involving financial
institutions located in California. Some of the merged banks, such as
Norwest/Wells Fargo, employ a strong community-based
    
 
                                       5
<PAGE>
   
banking model of doing business that may increase competition with our
distinctive combination of traditional community bank service coupled with a
large branch network.
    
 
   
RESTRICTIONS ON DIVIDENDS AND OTHER DISTRIBUTION COULD LIMIT AMOUNTS PAYABLE TO
  US
    
 
   
    A substantial portion of our cash flow typically comes from dividends our
bank and nonbank subsidiaries pay to us. Various statutory provisions restrict
the amount of dividends our subsidiaries can pay to us without regulatory
approval. In addition, if any of our subsidiaries liquidates, that subsidiary's
creditors will be entitled to receive distributions from the assets of that
subsidiary to satisfy their claims against it before we, as a holder of an
equity interest in the subsidiary, will be entitled to receive any of the assets
of the subsidiary. If, however, we are a creditor of the subsidiary with
recognized claims against it, we would be in the same position.
    
 
   
ADVERSE EFFECTS OF BANKING REGULATIONS OR CHANGES IN BANKING REGULATIONS COULD
  ADVERSELY AFFECT US
    
 
    We are subject to significant federal and state regulation and supervision,
which is primarily for the benefit and protection of our customers and not for
the benefit of investors. In the past, our business has been materially affected
by these regulations. This trend is likely to continue in the future. Laws,
regulations or policies currently affecting us and our subsidiaries may change
at any time. Regulatory authorities may also change their interpretation of
these statutes and regulations. Therefore, our business may be adversely
affected by any future changes in laws, regulations, policies or
interpretations.
 
   
    Additionally, our international activities may be subject to the laws and
regulations of the jurisdiction where business is being conducted. International
laws, regulations and policies affecting us and our subsidiaries may change at
any time and affect our business opportunities and competitiveness in these
jurisdictions. Due to The Bank of Tokyo-Mitsubishi's controlling ownership of
UNBC, laws, regulations and policies adopted or enforced by the Government of
Japan may adversely affect our activities and investments and those of our
subsidiaries in the future.
    
 
    Under long-standing policy of the Board of Governors of the Federal Reserve
System, a bank holding company is expected to act as a source of financial
strength for its subsidiary banks. As a result of that policy, UNBC may be
required to commit financial and other resources to its subsidiary bank in
circumstances where it might not otherwise do so.
 
   
POSSIBLE DISRUPTION OF BUSINESS DUE TO THE YEAR 2000 PROBLEM
    
 
    The year 2000 problem results from an inability of computer systems to
accurately recognize dates on and after the year 2000. The year 2000 problem is
a broad business issue that extends beyond computer failures to possible
failures of entire infrastructures, such as telecommunications and data
networks, building facilities and security systems and systems of other
institutions, including governmental agencies, to settle transactions.
 
   
    Many of our critical operations are not presently ready to operate normally
in the year 2000 and beyond, although preparations are underway to correct this.
We are preparing for the century change with an enterprise-wide year 2000
program. It has identified all of the major application and processing systems,
and sought external and internal resources to replace and test the systems. We
are testing purchased software, internally developed systems and systems
supported by external parties as part of the program. We are evaluating
customers and vendors that have significant relationships with UNBC to determine
whether they are adequately preparing for the year 2000. In addition, we are
developing contingency plans to reduce the impact of some potential events that
may occur. However, we cannot guarantee that the systems of vendors or customers
with which we do business will be completed on a timely basis, or that
contingency plans will shield operations from failures that may occur.
    
 
                                       6
<PAGE>
    The year 2000 problem poses the following principal risks to our business:
 
    - disruption of our business due to our failure to achieve year 2000
      readiness;
 
    - disruption of our business due to failure of third parties to achieve year
      2000 readiness; and
 
    - disruption in our funding and repayment operations due to failure of fund
      providers and obligors to achieve year 2000 readiness.
 
   
    We estimate that the total cost of the year 2000 project will be
approximately $50 million. We are funding the cost of the year 2000 project by
normal operating cash flow. We are staffing our year 2000 project with external
people as well as internal staff re-deployed from less time-sensitive
assignments. Our estimated total cost could change further as analysis
continues. Because of the range of possible issues and the large number of
variables involved, however, we cannot definitively quantify the potential
costs. For example, our remediation efforts or the efforts of third parties may
be unsuccessful. Any failure of such remediation efforts could result in a loss
of business, damage to our reputation or legal liability. Consequently, such
failures could have a material adverse effect on our business.
    
 
   
POSSIBLE FUTURE SALES OF SHARES BY THE BANK OF TOKYO-MITSUBISHI, LTD. COULD
  ADVERSELY AFFECT THE MARKET FOR OUR STOCK
    
 
   
    Although The Bank of Tokyo-Mitsubishi has announced its intention to
maintain its majority ownership in UNBC, it may sell shares of our common stock
in compliance with the federal securities laws. By virtue of its current control
of UNBC, The Bank of Tokyo-Mitsubishi could sell large amounts of its shares of
our common stock by causing us to file a registration statement that would allow
them to sell shares more easily. In addition, The Bank of Tokyo-Mitsubishi could
sell its shares of our common stock without registration pursuant to Rule 144
under the Securities Act. Although we can make no prediction as to the effect,
if any, that such sales would have on the market price of our common stock,
sales of substantial amounts of our common stock, or the perception that such
sales could occur, could adversely affect market prices. If The Bank of
Tokyo-Mitsubishi sells or transfers its shares of our common stock as a block,
another person or entity could become the controlling shareholder of UNBC.
    
 
                                       7
<PAGE>
   
                                   THE TRUSTS
    
 
   
    UNBC created four Delaware business trusts by executing, as sponsor, four
Declarations of Trust with five appointed trustees for each trust. The trusts
are named UnionBanCal Finance Trust I, UnionBanCal Finance Trust II, UnionBanCal
Finance Trust III, and UnionBanCal Finance Trust IV (each, a "Trust"). Prior to
the issuance of trust preferred securities, we will file an Amended and Restated
Declaration of Trust (a "Declaration") for the Trust that will issue the trust
preferred securities. The Declaration will state the terms and conditions for
the Trust to issue and sell its preferred securities and its common securities.
A form of Declaration is filed as an exhibit to the registration statement of
which this prospectus is a part.
    
 
   
    Each Trust will exist solely to:
    
 
   
    - issue and sell its preferred and common securities;
    
 
   
    - use the proceeds from the sale of its preferred and common securities to
      purchase a series of UNBC's debt securities; and
    
 
   
    - engage in other activities that are necessary or incidental to these
      purposes.
    
 
   
    We will purchase all of the common securities of each Trust. Unless
otherwise stated in the applicable prospectus supplement, the trust common
securities will represent an aggregate liquidation amount equal to at least 3%
of each Trust's total capitalization. The trust preferred securities will
represent the remaining approximately 97% of such Trust's total capitalization.
The trust common securities will have terms substantially identical to, and will
rank equal in priority of payment with, the trust preferred securities. However,
if an event of default under the related Declaration has occurred, then cash
distributions and liquidation, redemption and other amounts payable on the trust
common securities will be subordinate to the trust preferred securities in
priority of payment.
    
 
   
    UNBC will guarantee the trust preferred securities as described later in
this prospectus and the applicable prospectus supplement.
    
 
   
    We have appointed five trustees to conduct the Trusts' business and affairs:
    
 
   
    - The First National Bank of Chicago ("Property Trustee")
    
 
   
    - First Chicago Delaware Inc. ("Delaware Trustee")
    
 
   
    - Three officers of UNBC ("Regular Trustees")
    
 
   
    Only UNBC, as the only holder of the common securities of each Trust, can
remove or replace the trustees. In addition, UNBC can increase or decrease the
number of trustees. The majority of trustees, however, will always be Regular
Trustees.
    
 
   
    UNBC will pay all fees and expenses related to each Trust and to each
offering of the related preferred securities, except each Trust will pay for its
obligations under the related preferred and common securities.
    
 
   
    The Trusts will not have separate financial statements. The statements would
not be material to holders of the preferred securities because the Trusts will
not have any independent operations. The Trusts exist solely for the reasons
stated above.
    
 
                                       8
<PAGE>
                                USE OF PROCEEDS
 
    The net proceeds of the sale of the common and preferred securities issued
by each Trust will be invested by such Trust in the related series of debt
securities of the Company. Unless otherwise stated in the applicable prospectus
supplement, the Company intends to use such proceeds, in addition to the net
proceeds of any securities sold by the Company, for possible repurchases of the
Company's outstanding securities and for general corporate purposes, including
working capital, acquisitions and other business opportunities.
 
                RATIO OF EARNINGS TO COMBINED FIXED CHARGES AND
                           PREFERRED STOCK DIVIDENDS
 
   
    The following table presents the ratio of earnings to combined fixed charges
and preferred stock dividends for the Company for the periods indicated.
    
 
<TABLE>
<CAPTION>
                                                                                                              NINE MONTHS ENDED
                                                                    YEARS ENDED DECEMBER 31,                    SEPTEMBER 30,
                                                      -----------------------------------------------------  --------------------
                                                        1993       1994       1995       1996       1997       1997       1998
                                                      ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                                   <C>        <C>        <C>        <C>        <C>        <C>        <C>
Ratio of earnings to combined fixed charges and
  preferred stock dividends:
    Excluding interest on deposits..................       1.33x      1.46x      1.68x      1.51x      1.78x      1.79x      1.85x
    Including interest on deposits..................       1.20       1.29       1.42       1.30       1.45       1.46       1.49
</TABLE>
 
   
    For purposes of computing these ratios, earnings represent consolidated
income before income taxes and cumulative effects of accounting changes plus
consolidated fixed charges. Combined fixed charges represent interest expense,
including interest on deposits where indicated, and such portion of rental
expense deemed representative of the interest factor. The denominator is
increased for preferred stock dividend requirements which represent the amount
of pre-tax earnings required to cover such dividend requirements.
    
 
                                       9
<PAGE>
                           DESCRIPTION OF SECURITIES
 
    This prospectus contains a summary of our common stock, preferred stock,
depositary shares, debt securities, preferred securities of the Trusts, and
preferred securities guarantees of UNBC relating to each Trust. The securities
issued by the Trusts will be identical with respect to each Trust, except as
otherwise described in the prospectus supplement for such securities. These
summaries are not meant to be a complete description of each security. However,
this prospectus and the accompanying prospectus supplement contain the material
terms and conditions for each security.
 
DESCRIPTION OF CAPITAL STOCK
 
   
    The following descriptions of the capital stock of UNBC are not complete.
You should also read our Amended and Restated Articles of Incorporation, our
ByLaws and the California General Corporation Law ("CGCL"). We have filed copies
of the Articles of Incorporation and the Bylaws with the SEC. These documents
are incorporated by reference into the registration statement of which this
prospectus is a part.
    
 
   
    UNBC has 305,000,000 shares of capital stock authorized, of which
300,000,000 shares are common stock and 5,000,000 shares are preferred stock. As
of December 31, 1998,          shares of our common stock were issued and
outstanding, and no shares of our preferred stock were issued or outstanding.
    
 
COMMON STOCK
 
   
    Each holder of our common stock is entitled to one vote for each share held
on all matters to be voted upon by our shareholders. The holders of outstanding
shares of our common stock are entitled to receive ratably such dividends out of
assets legally available therefor as our Board of Directors may determine. Upon
liquidation or dissolution of UNBC, the holders of our common stock will be
entitled to share ratably in the assets of UNBC legally available for
distribution to shareholders after payment of liabilities. If we have any
preferred stock outstanding, holders of the preferred stock may be entitled to
dividend and/ or liquidation preferences. In either such case, we must pay the
applicable distribution to the holders of our preferred stock before we may pay
them to the holders of our common stock. Holders of our common stock have no
conversion, sinking fund, redemption, preemptive or subscription rights. In
addition, our common stock does not have cumulative voting rights. Shares of our
common stock are not subject to further calls or assessments by UNBC.
    
 
PREFERRED STOCK
 
   
    We are authorized to issue 5,000,000 shares of preferred stock, none of
which currently is issued or outstanding. Our Board has the authority to
determine and alter the rights, preferences, privileges and restrictions granted
to or imposed upon any wholly unissued series of our preferred stock and to fix
the number of shares, dividend rights, conversion or exchange rights, voting
rights, redemption rights, liquidation preferences, and sinking funds of any
series of our preferred stock. The authorized shares of our preferred stock will
be available for issuance without further action by our shareholders, unless
shareholder action is required by applicable law or by the rules of a stock
exchange on which any series of our stock may be listed. The holders of our
preferred stock will have the right to vote separately as a class on any
proposal involving fundamental changes in the rights of holders of such
preferred stock pursuant to the CGCL.
    
 
   
    This authority of our Board of Directors gives it the power to approve the
issuance of a series of preferred stock that could, depending on its terms,
either impede or facilitate the completion of a merger, tender offer or other
takeover attempt. For example, the issuance of new shares might impede a
business combination if the terms of those shares include voting rights that
would enable a holder to block business combinations. Conversely, the issuance
of new shares might facilitate a business combination if those shares have
general voting rights sufficient to satisfy an applicable percentage vote
requirement.
    
 
                                       10
<PAGE>
   
    If applicable, the terms on which our preferred stock may be convertible
into or exchangeable for our common stock or other securities of UNBC will be
set forth in the applicable Certificate of Determination and prospectus
supplement. The terms will include provisions as to whether conversion or
exchange is mandatory, at the option of the holder, or at the option of UNBC,
and may include provisions that adjust the number of shares of our common stock
or other securities of ours that the holders of our preferred stock may receive.
    
 
   
WRITTEN CONSENTS
    
 
   
    Our Bylaws provide that any shareholder action can be taken by written
consent of the shareholders. As a result, The Bank of Tokyo-Mitsubishi, which
owns a majority of shares of our common stock, can take action by written
consent.
    
 
   
DIRECTORS' LIABILITY
    
 
   
    Our Articles of Incorporation provide for indemnification of directors to
the fullest extent authorized by California law. Section 317 of the CGCL
contains provisions permitting, and in some situations, requiring California
corporations to provide indemnification to their directors and officers for
losses and litigation expenses incurred in connection with their service to the
corporation in those capacities.
    
 
TRANSFER AGENT AND REGISTRAR
 
    Harris Trust Company of California acts as transfer agent and registrar for
our common stock.
 
DESCRIPTION OF DEPOSITARY SHARES
 
   
    The following description of the depositary shares is not complete. You
should also read the Deposit Agreement relating to the depositary shares and the
depositary receipt relating to the preferred stock that is attached to the
Deposit Agreement. We will file those documents with the SEC as an exhibit to
the registration statement of which this prospectus is a part.
    
 
   
GENERAL
    
 
   
    If we elect to offer fractional interests in shares of preferred stock, we
will provide for the issuance by a depositary to the public of receipts for
depositary shares. Each depositary share will represent fractional interests of
preferred stock. We will deposit the shares of preferred stock underlying the
depositary shares under a Deposit Agreement between us and a bank or trust
company selected by us. The bank or trust company must have its principal office
in the United States and a combined capital and surplus of at least $50 million.
The depositary receipts will evidence the depositary shares issued under the
Deposit Agreement.
    
 
   
    The Deposit Agreement will contain terms applicable to the holders of
depositary shares in addition to the terms stated in the depositary receipts.
Each owner of depositary shares will be entitled to all the rights and
preferences of the preferred stock underlying the depositary shares in
proportion to the applicable fractional interest in the underlying shares of
preferred stock. The depositary will issue the depositary receipts to
individuals purchasing the fractional interests in shares of the related
preferred stock according to the terms of the offering described in a prospectus
supplement.
    
 
   
DIVIDENDS AND OTHER DISTRIBUTIONS
    
 
   
    The depositary will distribute all cash dividends or other cash
distributions received for the preferred stock to the entitled record holders of
depositary shares in proportion to the number of depositary shares that the
holder owns on the relevant record date. The depositary will distribute only an
amount that can be distributed without attributing to any holder of depositary
shares a fraction of one cent. The depositary will
    
 
                                       11
<PAGE>
   
add the undistributed balance to and treat it as part of the next sum received
by the depositary for distribution to holders of depositary shares.
    
 
   
    If there is a non-cash distribution, the depositary will distribute property
received by it to the entitled record holders of depositary shares, in
proportion, insofar as possible, to the number of depositary shares owned by the
holders, unless the depositary determines, after consultation with us, that it
is not feasible to make such distribution. If this occurs, the depositary may,
with our approval, sell such property and distribute the net proceeds from the
sale to the holders. The Deposit Agreement also will contain provisions relating
to how any subscription or similar rights that we may offer to holders of the
preferred stock will be available to the holders of the depositary shares.
    
 
   
CONVERSION, EXCHANGE AND REDEMPTION
    
 
   
    If any series of preferred stock underlying the depositary shares is subject
to conversion or exchange, each record holder of depositary receipts will have
the right or obligation to convert or exchange the depositary shares represented
by the depositary receipts.
    
 
   
    Whenever we redeem shares of preferred stock held by the depositary, the
depositary will redeem, at the same time, the number of depositary shares
representing the preferred stock. The depositary will redeem the depositary
shares from the proceeds it receives from the corresponding redemption, in whole
or in part, of the applicable series of preferred stock. The depositary will
mail notice of redemption to the record holders of the depositary shares to be
redeemed between 30 and 60 days before the date fixed for redemption. The
redemption price per depositary share will be equal to the applicable fraction
of the redemption price per share on the applicable series of preferred stock.
If less than all the depositary shares are to be redeemed, the depositary will
select which shares to be redeemed by lot, PRO RATA or any other method.
    
 
   
    After the date fixed for redemption, the depositary shares called for
redemption will no longer be outstanding. When the depositary shares are no
longer outstanding, all rights of the holders will end, except the right to
receive money, securities or other property payable upon redemption.
    
 
   
VOTING
    
 
   
    When the depositary receives notice of a meeting at which the holders of the
preferred stock are entitled to vote, the depositary will mail the particulars
of the meeting to the record holders of the depositary shares. Each record
holder of depositary shares on the record date may instruct the depositary on
how to vote the shares of preferred stock underlying the holder's depositary
shares. The depositary will try, if practical, to vote the number of shares of
preferred stock underlying the depositary shares according to the instructions.
We will agree to take all reasonable action requested by the depositary to
enable it to vote as instructed.
    
 
   
AMENDMENTS
    
 
   
    We and the depositary may agree to amend the Deposit Agreement and the
depositary receipt evidencing the depositary shares. Any amendment that (a)
imposes or increases certain fees, taxes or other charges payable by the holders
of the depositary shares as described in the Deposit Agreement or that (b)
otherwise prejudices any substantial existing right of holders of depositary
shares, will not take effect until 30 days after the depositary has mailed
notice of the amendment to the record holders of depositary shares. Any holder
of depositary shares that continues to hold its shares at the end of the 30-day
period will be deemed to have agreed to the amendment.
    
 
                                       12
<PAGE>
   
TERMINATION
    
 
   
    UNBC may direct the depositary to terminate the Deposit Agreement by mailing
a notice of termination to holders of depositary shares at least 30 days prior
to termination. In addition, a Deposit Agreement will automatically terminate
if:
    
 
   
    - the depositary has redeemed all related outstanding depositary shares, or
    
 
   
    - UNBC has liquidated, dissolved or wound up its business and the depositary
      has distributed the preferred stock of the relevant series to the holders
      of the related depositary shares.
    
 
   
PAYMENT OF FEES AND EXPENSES
    
 
   
    We will pay all fees, charges and expenses of the depositary, including the
initial deposit of the preferred stock and any redemption of the preferred
stock. Holders of depositary shares will pay transfer and other taxes and
governmental charges and any other charges as are stated in the Deposit
Agreement for their accounts.
    
 
   
RESIGNATION AND REMOVAL OF DEPOSITARY
    
 
   
    At any time, the depositary may resign by delivering notice to us, and we
may remove the depositary. Resignations or removals will take effect upon the
appointment of a successor depositary and its acceptance of the appointment. The
successor depositary must be appointed within 60 days after delivery of the
notice of resignation or removal and must be a bank or trust company having its
principal office in the United States and having a combined capital and surplus
of at least $50 million.
    
 
   
REPORTS
    
 
   
    The depositary will forward to the holders of depositary shares all reports
and communications from us that are delivered to the depositary and that we are
required by law, the rules of an applicable securities exchange or our Articles
of Incorporation to furnish to the holders of the preferred stock. Neither we
nor the depositary will be liable if the depositary is prevented or delayed by
law or any circumstances beyond its control in performing its obligations under
the Deposit Agreement. The Deposit Agreements limits our obligations and the
depositary's obligations to performance in good faith of the duties stated in
the Deposit Agreement. Neither we nor the depositary will be obligated to
prosecute or defend any legal proceeding connected with any depositary shares or
preferred stock unless the holders of depositary shares requesting us to do so
furnish us with satisfactory indemnity. In performing our obligations, we and
the depositary may rely upon the written advice of our counsel or accountants,
on any information that competent people provide to us and on documents that we
believe are genuine.
    
 
DESCRIPTION OF THE TRUST PREFERRED SECURITIES
 
   
    The following descriptions of the trust preferred securities are not
complete. You should also read the Declaration for each Trust, the indenture
between UNBC and The First National Bank of Chicago, as trustee (the
"Indenture"), relating to the issuance of the debt securities by UNBC and any
supplement to the Indenture. We will file these documents with the SEC as an
exhibit to the registration statement of which this prospectus is a part.
    
 
GENERAL
 
   
    Each Declaration authorizes the Regular Trustees to issue on behalf of a
Trust one series of preferred securities that will have the terms described in a
prospectus supplement. A Trust will use the proceeds from the sale of its
preferred and common securities to purchase a series of UNBC's debt securities.
The Property Trustee will hold the debt securities in trust for the benefit of
the holders of the preferred and common securities.
    
 
                                       13
<PAGE>
   
    UNBC will guarantee the trust preferred securities under a Trust Preferred
Securities Guarantee. UNBC will agree to make payments of distributions and
payments on redemption or liquidation with respect to a Trust's preferred
securities, but only to the extent the Trust has funds available to make those
payments and has not done so. See "Description of the Trust Preferred Securities
Guarantees."
    
 
   
    The assets of a Trust available for distribution to the holders of its
preferred securities will be limited to payments from UNBC under the series of
debt securities held by the Trust. If UNBC fails to make a payment on the
related debt securities, the Trust will not have enough funds to make related
payments, including distributions, on its preferred securities.
    
 
    Each Trust Preferred Securities Guarantee, when taken together with our
obligations under the related series of debt securities and the Indenture and
the related Declaration, will provide a full and unconditional guarantee of
amounts due on the preferred securities issued by a Trust.
 
   
    Each Declaration will be qualified as an indenture under the Trust Indenture
Act of 1939. Each Property Trustee will act as indenture trustee for the
preferred securities to be issued by the applicable Trust, in order to comply
with the provisions of the Trust Indenture Act.
    
 
   
    Each series of trust preferred securities will have the terms, including
distributions, redemption, voting, liquidation rights and such other preferred,
deferred or other special rights or restrictions as are described in the
relevant Declaration or made part of the Declaration by the Trust Indenture Act
or by the Delaware Business Trust Act. The terms of the preferred securities
will mirror the terms of the debt securities held by the applicable Trust.
    
 
   
    The prospectus supplement relating to the preferred securities of a Trust
will describe the specific terms of the preferred securities, including:
    
 
   
    - the name of the preferred securities;
    
 
    - the dollar amount and number of preferred securities issued;
 
   
    - the annual distribution rate(s), or method of determining the rate(s), the
      payment date(s) and the record dates used to determine the holders who are
      to receive distributions and the place(s) where distributions and other
      amounts payable will be paid;
    
 
    - any provision relating to deferral of distribution payments;
 
    - the date from which distributions shall be cumulative;
 
   
    - the optional redemption provisions, if any, including the prices, time
      periods and other terms and conditions for which preferred securities will
      be purchased or redeemed, in whole or in part;
    
 
    - the terms and conditions, if any, upon which the applicable series of debt
      securities may be distributed to holders of such preferred securities;
 
   
    - the voting rights, if any, of holders of the preferred securities;
    
 
   
    - any securities exchange on which the preferred securities will be listed;
    
 
    - whether such preferred securities are to be issued in book-entry form and
      represented by one or more global certificates, and if so, the depositary
      for such global certificates and the specific terms of the depositary
      arrangements; and
 
    - any other relevant rights, preferences, privileges, limitations or
      restrictions of such preferred securities.
 
   
    Each prospectus supplement will describe certain United States federal
income tax considerations applicable to the purchase, holding and disposition of
the series of trust preferred securities covered by the prospectus supplement.
    
 
                                       14
<PAGE>
LIQUIDATION DISTRIBUTION UPON DISSOLUTION
 
    Unless otherwise specified in the applicable prospectus supplement, each
Declaration states that the related Trust shall be dissolved:
 
    - on the expiration of the term of such Trust;
 
    - upon the bankruptcy of UNBC;
 
    - upon the filing of a certificate of dissolution or its equivalent with
      respect to UNBC;
 
    - upon the filing of a certificate of cancellation with respect to such
      Trust after obtaining the consent of at least a majority in liquidation
      amount of the preferred and common securities of such Trust, voting
      together as a single class;
 
   
    - 90 days after the revocation of the charter of UNBC and the charter is not
      reinstated during that 90-day period;
    
 
   
    - upon the written direction from us and after the distribution of the
      related debt securities directly to the holders of the preferred and
      common securities of such Trust in exchange for such Securities;
    
 
   
    - upon the occurrence of certain tax or other specified events that cause
      the Trust to be dissolved and the distribution of the related debt
      securities directly to the holders of the preferred and common securities
      of the Trust;
    
 
   
    - before the issuance of any securities with the consent of all Regular
      Trustees and UNBC;
    
 
    - upon the redemption of all of the common and preferred securities of such
      Trust; or
 
    - upon entry of a court order for the dissolution of UNBC or such Trust.
 
   
    Unless otherwise specified in the applicable prospectus supplement, in the
event of a dissolution, after the Trust pays all amounts owed to creditors, the
holders of the preferred and common securities issued by the Trust will be
entitled to receive:
    
 
    - cash equal to the aggregate liquidation amount of each preferred and
      common security specified in an accompanying prospectus supplement, plus
      accumulated and unpaid distributions to the date of payment; unless
 
    - debt securities in an aggregate principal amount equal to the aggregate
      liquidation amount of the preferred and common securities are distributed
      to the holders of the preferred and common securities.
 
   
    If the Trust cannot pay the full amount due on its preferred and common
securities because it does not have enough assets for payment, then the amounts
the Trust owes on its preferred and common securities will be paid pro rata.
However, if an event of default under the related Declaration has occurred, the
total amounts due on the preferred securities will be paid before any
distribution on the common securities.
    
 
DECLARATION EVENTS OF DEFAULT
 
    An event of default under the Indenture relating to a series of debt
securities is an event of default under the Declaration of the Trust that owns
those debt securities (a "Declaration Event of Default"). See "Description of
Debt Securities--Events of Default."
 
   
    UNBC and the Regular Trustees of a Trust must file annually with the
applicable Property Trustee a certificate stating whether or not UNBC is in
compliance with all the applicable conditions and covenants under the related
Declaration.
    
 
   
    Upon the happening of a Declaration Event of Default, the Property Trustee
of the applicable Trust, as the sole holder of the debt securities held by such
Trust, will have the right under the Indenture to
    
 
                                       15
<PAGE>
declare the principal of, premium, if any, and interest on such debt securities
to be immediately due and payable.
 
   
    If a Property Trustee fails to enforce its rights under the related
Declaration or the Indenture to the fullest extent permitted by law and subject
to the terms of the Declaration and the Indenture, any holder of the preferred
securities issued by the Trust may sue UNBC, or seek other remedies, to enforce
the Property Trustee's rights under the Declaration or the Indenture without
first instituting a legal proceeding against the Property Trustee or any other
person.
    
 
    If we fail to pay principal, premium, if any, or interest on a series of
debt securities when payable, then a holder of the related trust preferred
securities may directly sue us or seek other remedies, to collect its pro rata
share of payments owned.
 
REMOVAL AND REPLACEMENT OF TRUSTEES
 
   
    Only UNBC, as the only holder of a Trust's common securities, has the right
to remove or replace the trustees of such Trust. The resignation or removal of
any trustee and the appointment of a successor trustee shall be effective only
on the acceptance of appointment by the successor trustee in accordance with the
provisions of the Declaration for such Trust.
    
 
CONVERSION OR EXCHANGE RIGHTS
 
   
    The terms that govern whether trust preferred securities of any series are
convertible into or exchangeable for our common stock or other securities of
UNBC will be set forth in the prospectus supplement relating to the trust
preferred securities. The terms will include provisions as to whether conversion
or exchange is mandatory, at the option of the holder or at the option of UNBC,
and may include provisions that adjust the number of shares of our common stock
or other securities of ours that the holders of trust preferred securities may
receive.
    
 
MERGERS, CONSOLIDATIONS OR AMALGAMATIONS OF THE TRUSTS
 
   
    A Trust may not consolidate, amalgamate, merge with or into, or be replaced
by, or convey, transfer or lease its properties and assets substantially as an
entirety to, any other corporation or other body ("Merger Event"), except as
described below. A Trust may, with the consent of a majority of its Regular
Trustees and without the consent of the holders of its preferred and common
securities or the other Trustees, consolidate, amalgamate, merge with or into,
or be replaced by another Trust, provided that:
    
 
    - the successor entity either
 
       (1) assumes all of the obligations of the Trust relating to its preferred
           and common securities or
 
   
       (2) substitutes for the Trust's preferred and common securities other
           securities substantially similar to the Trust's preferred and common
           securities ("successor securities"), so long as the successor
           securities rank the same as the preferred and common securities for
           distributions and payments upon liquidation, redemption and
           otherwise;
    
 
   
    - UNBC acknowledges a trustee of the successor entity who has the same
      powers and duties as the Property Trustee of the Trust as the holder of
      the particular series of debt securities;
    
 
   
    - the Merger Event does not adversely affect the rights, preferences and
      privileges of the holders of its trust preferred and trust common
      securities or successor securities in any material way, except with
      respect to any dilution of the holders' interest in the new entity;
    
 
    - the Merger Event does not cause the preferred securities or successor
      securities to be downgraded by any nationally recognized statistical
      rating organization;
 
    - the successor entity has a purpose identical to that of the Trust;
 
                                       16
<PAGE>
   
    - prior to the Merger Event, UNBC has received an opinion of counsel from a
      nationally recognized law firm stating that (a) such Merger Event does not
      adversely effect the rights, preferences and privileges of the holders of
      the preferred securities, including any successor securities, in any
      material respect and (b) following the Merger Event, neither the Trust nor
      the successor entity will be required to register as an "investment
      company" under the Investment Company Act of 1940; and
    
 
   
    - UNBC guarantees the obligations of the successor entity under the
      successor securities in the same manner as in the applicable Trust
      Preferred Securities Guarantee and the guarantee of the common securities
      for the Trust, if any.
    
 
    In addition, unless all of the holders of the trust preferred and trust
common securities approve otherwise, a Trust shall not consolidate, amalgamate,
merge with or into, or be replaced by any other entity or permit any other
entity to consolidate, amalgamate, merge with or into, or replace it, if such
transaction would cause the Trust or the successor entity to be classified as
other than a grantor trust for United States federal income tax purposes.
 
VOTING RIGHTS; AMENDMENT OF DECLARATIONS
 
   
    The holders of trust preferred securities have no voting rights except as
discussed below and under "--Mergers, Consolidations or Amalgamations of the
Trust" and "Description of the Trust Preferred Securities Guarantees--Amendments
and Assignment," and as otherwise required by law and the Declaration for the
applicable Trust.
    
 
   
    A Declaration may be amended if approved by a majority of the Regular
Trustees of the applicable Trust. However, if any proposed amendment provides
for, or the Regular Trustees otherwise propose to effect,
    
 
       (1) any action that would adversely affect the powers, preferences or
           special rights of the trust's preferred and common securities,
           whether by way of amendment to such Declaration or otherwise; or
 
       (2) the dissolution, winding-up or termination of the Trust other than
           pursuant to the terms of its Declaration,
 
   
then the holders of the Trust's preferred and common securities voting together
as a single class will be entitled to vote on the amendment or proposal. In that
case, the amendment or proposal will only be effective if approved by at least a
majority in liquidation amount of the trust preferred and trust common
securities affected by the amendment or proposal.
    
 
   
    If any amendment or proposal referred to in clause (1) above would adversely
affect only the preferred securities or only the common securities of a Trust,
then only the affected class will be entitled to vote on the amendment or
proposal and the amendment or proposal will only be effective with the approval
of at least a majority in liquidation amount of the affected class.
Notwithstanding the foregoing, certain specified provisions of the Declaration
may not be amended without the consent of all holders of the trust's preferred
and common securities.
    
 
   
    No amendment may be made to a Declaration if the amendment would:
    
 
    - cause the related Trust to be characterized as other than a grantor trust
      for United States federal income tax purposes;
 
    - reduce or otherwise adversely affect the powers of the related Property
      Trustee; or
 
    - cause the related Trust to be deemed to be an "investment company" which
      is required to be registered under the Investment Company Act.
 
                                       17
<PAGE>
    The holders of a majority in aggregate liquidation amount of the preferred
securities of each Trust have the right to:
 
    - direct the time, method and place of conducting any proceeding for any
      remedy available to the Property Trustee of the Trust; or
 
    - direct the exercise of any Trust or power conferred upon such Property
      Trustee under that Trust's Declaration, including the right to direct the
      Property Trustee, as the holder of a series of debt securities, to
 
   
       (1) exercise the remedies available under the Indenture with respect to
           the debt securities,
    
 
       (2) waive any event of default under the Indenture that is waivable,
 
       (3) cancel an acceleration of the principal of the debt securities, or
 
   
       (4) consent to any amendment, modification or termination of the
           Indenture where consent is required,
    
 
   
but if an event of default under the Indenture has occurred and is continuing,
then the holders of 25% of the aggregate liquidation amount of the trust
preferred securities may direct the Property Trustee to declare the debt
securities immediately due and payable. If, however, the Indenture requires the
consent of the holders of more than a majority in aggregate principal amount of
a series of debt securities (a "super-majority"), then the Property Trustee for
the trust preferred securities related to that series of debt securities must
get approval of the holders of the same super-majority in liquidation amount of
the trust preferred securities. In addition, before taking any of the foregoing
actions, except for directing the time, method and place of conducting any
proceeding for any remedy available to the Property Trustee, the Property
Trustee must obtain an opinion of counsel from a nationally recognized law firm
stating that the action would not cause the Trust to be classified as other than
a grantor trust for United States federal income tax purposes.
    
 
   
    The Property Trustee of a Trust will notify all preferred securities holders
of the Trust of any notice received from the Trustee with respect to the debt
securities held by the Trust.
    
 
   
    As described in each Declaration, the Regular Trustee may hold a meeting to
have trust preferred securities holders vote on a change or have them approve
the change by written consent.
    
 
   
    If a vote of trust preferred securities holders is taken or a consent is
obtained, any trust preferred securities that are owned by UNBC or any of our
affiliates will, for purposes of the vote or consent, be treated as if they were
not outstanding. This means that:
    
 
   
    - UNBC and any of our affiliates will not be able to vote on or consent to
      matters requiring the vote or consent of holders of trust preferred
      securities and
    
 
   
    - any trust preferred securities owned by us, the Regular Trustees or any of
      our respective affiliates will not be counted in determining whether the
      required percentage of votes or consents has been obtained.
    
 
INFORMATION CONCERNING THE PROPERTY TRUSTEES
 
   
    The Property Trustees will be unaffiliated with UNBC and The Bank of
Tokyo-Mitsubishi. For matters relating to compliance with the Trust Indenture
Act, the Property Trustee of each Trust will have all of the duties and
responsibilities of an indenture trustee under the Trust Indenture Act. Each
Property Trustee, other than during the occurrence and continuance of a
Declaration Event of Default under the applicable Trust, undertakes to perform
only those duties that are specifically stated in the applicable Declaration
and, upon a Declaration Event of Default, must use the same degree of care and
skill as a prudent person would exercise or use in the conduct of his or her own
affairs. In addition, a Property Trustee is under no
    
 
                                       18
<PAGE>
obligation to exercise any of the powers given it by the applicable Declaration
at the request of any holder of trust preferred securities unless it is offered
reasonable security or indemnity against the costs, expenses and liabilities
that it might incur. However, the holders of the trust preferred securities will
not be required to offer such an indemnity where the holders, by exercising
their voting rights, direct the Property Trustee to take any action following a
Declaration Event of Default.
 
MISCELLANEOUS
 
   
    The Trustees of each Trust are authorized and directed to conduct the
affairs of and to operate the Trust in such a way that
    
 
    - the Trust will not be deemed to be an "investment company" required to be
      registered under the Investment Company Act;
 
    - the Trust will be classified as a grantor trust for United States federal
      income tax purposes; and
 
    - the debt securities held by the Trust will be treated as indebtedness of
      UNBC for United States federal income tax purposes.
 
   
    UNBC and the Trustees of a Trust are authorized to take any legal action
that we and the Trustees of such Trust determine to be necessary or desirable
for such purposes so long as the action does not violate the Trust's certificate
of trust or its Declaration.
    
 
    Holders of trust preferred securities have no preemptive or similar rights.
 
    A Trust may not borrow money, issue debt, execute mortgages or pledge any of
its assets.
 
   
    The Property Trustee will promptly make distributions to the holders of the
Trust's preferred securities and common securities out of funds received by such
Trust from holding our debt securities.
    
 
GOVERNING LAW
 
    Each Declaration and the related trust preferred securities will be governed
by and construed in accordance with the laws of the State of Delaware.
 
DESCRIPTION OF DEBT SECURITIES
 
   
    The following descriptions of debt securities are not complete. You should
also read the Indenture. We will file the Indenture with the SEC as an exhibit
to the registration statement of which this prospectus is a part. All
capitalized terms have the meanings specified in the Indenture.
    
 
   
    We may issue, from time to time, debt securities, in one or more series,
that will consist of either our senior debt ("Senior Debt Securities"), our
senior subordinated debt ("Senior Subordinated Debt Securities"), our
subordinated debt ("Subordinated Debt Securities") or our junior subordinated
debt ("Junior Subordinated Debt Securities" and, together with the Senior
Subordinated Debt Securities and the Subordinated Debt Securities, the
"Subordinated Securities"). The debt securities we offer will be issued under an
Indenture between us and The First National Bank of Chicago, acting as trustee
(the "Trustee"). Debt securities, whether senior, senior subordinated,
subordinated or junior subordinated, may be issued as convertible debt
securities or exchangeable debt securities.
    
 
GENERAL TERMS OF THE INDENTURE
 
   
    The Indenture does not limit the amount of debt securities that we may
issue. It provides that we may issue debt securities up to the principal amount
that we may authorize and may be in any currency or currency unit that we may
designate. Except for the limitations on consolidation, merger and sale of all
or substantially all of our assets contained in the Indenture, the terms of the
Indenture do not contain any covenants or other provisions designed to give
holders of any debt securities protection with respect to our operations,
financial condition or transactions involving us.
    
 
                                       19
<PAGE>
   
    We may issue the debt securities issued under the Indenture as "discount
securities," which means they may be sold at a discount below their stated
principal amount. These debt securities, as well as certain other debt
securities that are not issued at a discount, may, for United States federal
income tax purposes, be treated as if they were issued with "original issue
discount" ("OID") because of certain interest payment and other characteristics.
Special United States federal income tax considerations applicable to debt
securities issued with original issue discount will be described in more detail
in any applicable Prospectus Supplement.
    
 
   
    The applicable prospectus supplement for a series of debt securities that we
issue will describe, among other things, the following terms of the offered debt
securities:
    
 
    - the title;
 
    - any limit on the aggregate principal amount;
 
    - whether issued in fully registered form without coupons or in a form
      registered as to principal only with coupons or in bearer form with
      coupons;
 
   
    - whether issued in the form of one or more global securities and whether
      all or a portion of the principal amount of the debt securities is
      represented thereby;
    
 
   
    - the price or prices at which the debt securities will be issued;
    
 
    - the date or dates on which principal is payable;
 
   
    - the place or places where and the manner in which principal, premium or
      interest will be payable and the place or places where the debt securities
      may be presented for transfer and, if applicable, conversion or exchange;
    
 
   
    - interest rates, and the dates from which interest, if any, will accrue,
      and the dates when interest is payable and the maturity;
    
 
    - the right, if any, to extend the interest payment periods and the duration
      of the extensions;
 
   
    - our rights or obligations to redeem or purchase the debt securities;
    
 
    - conversion or exchange provisions, if any, including conversion or
      exchange prices or rates and adjustments thereto;
 
    - the currency or currencies of payment of principal or interest;
 
    - the terms applicable to any debt securities issued at a discount from
      their stated principal amount;
 
   
    - the terms, if any, pursuant to which any debt securities will be
      subordinate to any of our other debt;
    
 
   
    - if the amount of payments of principal or interest is to be determined by
      reference to an index or formula, or based on a coin or currency other
      than that in which the debt securities are stated to be payable, the
      manner in which these amounts are determined and the calculation agent, if
      any, with respect thereto;
    
 
   
    - if other than the entire principal amount of the debt securities when
      issued, the portion of the principal amount payable upon acceleration of
      maturity as a result of a default on certain of our obligations;
    
 
    - if applicable, covenants affording holders of debt protection with respect
      to our operations, financial condition or transactions involving us; and
 
    - any other specific terms of any debt securities.
 
                                       20
<PAGE>
    The applicable prospectus supplement will set forth certain United States
federal income tax considerations for holders of any debt securities and the
securities exchange or quotation system on which any debt securities are listed
or quoted.
 
SENIOR DEBT SECURITIES
 
    Payment of the principal of, premium, if any, and interest on Senior Debt
Securities will rank on a parity with all of our other unsecured and
unsubordinated debt.
 
SENIOR SUBORDINATED DEBT SECURITIES
 
   
    Payment of the principal of, premium, if any, and interest on Senior
Subordinated Debt Securities will be junior in right of payment to the prior
payment in full of all of our unsubordinated debt, including Senior Debt
Securities. We will state in the applicable prospectus supplement relating to
any Senior Subordinated Debt Securities the subordination terms of the
securities as well as the aggregate amount of outstanding debt, as of the most
recent practicable date, that by its terms would be senior to the Senior
Subordinated Debt Securities. We will also state in such prospectus supplement
limitations, if any, on issuance of additional senior debt.
    
 
SUBORDINATED DEBT SECURITIES
 
   
    Payment of the principal of, premium, if any, and interest on Subordinated
Debt Securities will be subordinated and junior in right of payment to the prior
payment in full of all of our senior debt, including our senior subordinated
debt. We will state in the applicable prospectus supplement relating to any
Subordinated Debt Securities the subordination terms of the securities as well
as the aggregate amount of outstanding indebtedness, as of the most recent
practicable date, that by its terms would be senior to the Subordinated Debt
Securities. We will also state in such prospectus supplement limitations, if
any, on issuance of additional senior indebtedness.
    
 
JUNIOR SUBORDINATED DEBT SECURITIES
 
   
    Payment of the principal of, premium, if any, and interest on Junior
Subordinated Debt Securities will be subordinated and junior in right of payment
to the prior payment in full of all of our senior, senior subordinated and
subordinated debt. We will state in the applicable prospectus supplement
relating to any Junior Subordinated Debt Securities the subordination terms of
the securities as well as the aggregate amount of outstanding debt, as of the
most recent practicable date, that by its terms would be senior to the Junior
Subordinated Debt Securities. We will also state in such prospectus supplement
limitations, if any, on issuance of additional senior indebtedness.
    
 
CONVERSION OR EXCHANGE RIGHTS
 
   
    Debt securities may be convertible into or exchangeable for shares of our
equity securities. The terms and conditions of conversion or exchange will be
stated in the applicable prospectus supplement. The terms will include, among
others, the following:
    
 
    - the conversion or exchange price;
 
    - the conversion or exchange period;
 
    - provisions regarding the ability of us or the holder to convert or
      exchange the debt securities;
 
    - events requiring adjustment to the conversion or exchange price; and
 
   
    - provisions affecting conversion or exchange in the event of our redemption
      of the debt securities.
    
 
                                       21
<PAGE>
CONSOLIDATION, MERGER OR SALE
 
   
    We cannot consolidate or merge with or into, or transfer or lease all or
substantially all of our assets to, any person unless (a) we will be the
continuing corporation or (b) the successor corporation or person to which our
assets are transferred or leased is a corporation organized under the laws of
the United States, any state of the United States or the District of Columbia
and it expressly assumes our obligations under the debt securities and the
Indenture. In addition, we cannot complete such a transaction unless immediately
after giving effect to the transaction, no event of default under the Indenture,
and no event which, after notice or lapse of time or both, would become an event
of default under the Indenture, shall have happened and be continuing. When the
person to whom our assets are transferred or leased has assumed our obligations
under the debt securities and the Indenture, we shall be discharged from all our
obligations under the debt securities and the Indenture except in certain
limited circumstances.
    
 
   
    This covenant would not apply to any recapitalization transaction, a change
of control of UNBC or a highly leveraged transaction, unless the transaction or
change of control were structured to include a merger or consolidation or
transfer or lease of all or substantially all of our assets.
    
 
EVENTS OF DEFAULT
 
   
    The term "Event of Default," when used in the Indenture, unless otherwise
indicated, means any of the following:
    
 
   
    - failure to pay interest for 30 days after the date payment is due and
      payable; provided that if UNBC extends an interest payment period in
      accordance with the terms of the debt securities, the extension will not
      be a failure to pay interest;
    
 
    - failure to pay principal or premium, if any, on any debt security when
      due, either at maturity, upon any redemption, by declaration or otherwise;
 
    - failure to make sinking fund payments when due;
 
   
    - failure to perform certain other covenants for 90 days after notice that
      performance was required;
    
 
    - certain events in bankruptcy, insolvency or reorganization of UNBC; or
 
   
    - any other Event of Default provided in the applicable resolution of our
      Board or the supplemental indenture under which we issue a series of debt
      securities.
    
 
   
    An Event of Default for a particular series of debt securities does not
necessarily constitute an Event of Default for any other series of debt
securities issued under the Indenture. IF AN EVENT OF DEFAULT RELATING TO THE
PAYMENT OF INTEREST, PRINCIPAL OR ANY SINKING FUND INSTALLMENT WITH RESPECT TO
ANY SERIES OF DEBT SECURITIES HAS OCCURRED AND IS CONTINUING, THE TRUSTEE OR THE
HOLDERS OF NOT LESS THAN 25% IN AGGREGATE PRINCIPAL AMOUNT OF THE DEBT
SECURITIES OF EACH AFFECTED SERIES MAY DECLARE THE ENTIRE PRINCIPAL OF ALL THE
DEBT SECURITIES OF THAT SERIES TO BE DUE AND PAYABLE IMMEDIATELY.
    
 
   
    If an Event of Default relating to the performance of certain covenants
occurs and is continuing for a period of 90 days after notice of such, or if any
other Event of Default occurs and is continuing with respect to all of the
series of Senior Debt Securities, or if an Event of Default relating to certain
events in bankruptcy, insolvency or reorganization of UNBC occurs and is
continuing, then the Trustee or the holders of not less than 25% in aggregate
principal amount of all of the series of Senior Debt Securities may declare the
entire principal amount of all of the series of Senior Debt Securities due and
payable immediately. Similarly, if an Event of Default relating to the
performance of certain covenants occurs and is continuing for a period of 90
days after notice of such, or if any other Event of Default occurs and is
continuing with respect to all of the series of Subordinated Securities, or if
an Event of Default relating to certain events in bankruptcy, insolvency or
reorganization of UNBC occurs and is continuing, then the Trustee or the holders
of not less than 25% in aggregate principal amount of all of the series of
Subordinated Securities may declare the entire principal amount of all of the
series of Subordinated Securities due and payable immediately.
    
 
                                       22
<PAGE>
   
    If, however, the Event of Default relating to the performance of certain
covenants or any other Event of Default that has occurred and is continuing is
for less than all of the series of Senior Debt Securities or Subordinated
Securities, as the case may be, then, the Trustee or the holders of not less
than 25% in aggregate principal amount of each affected series of the Senior
Debt Securities or the Subordinated Securities, as the case may be, may declare
the entire principal amount of all debt securities of such affected series due
and payable immediately. The holders of not less than a majority in aggregate
principal amount of the debt securities of a series may, after satisfying
certain conditions, rescind and annul any of the above-described declarations
and consequences with respect to the series.
    
 
   
    The Indenture imposes limitations on suits brought by holders of debt
securities against us. Except for actions for payment of overdue principal or
interest, no holder of debt securities of any series may institute any action
against us under the Indenture unless:
    
 
   
    - the holder has previously given to the Trustee written notice of default
      and continuance of such default,
    
 
   
    - the holders of at least 25% in principal amount of the outstanding debt
      securities of the affected series have requested that the Trustee
      institute the action,
    
 
   
    - the requesting holders have offered the Trustee reasonable indemnity for
      expenses and liabilities that may be incurred by bringing the action,
    
 
   
    - the Trustee has not instituted the action within 60 days of the request;
      and
    
 
   
    - the Trustee has not received inconsistent direction by the holders of a
      majority in principal amount of the outstanding debt securities of the
      series.
    
 
   
    We will be required to file annually with the Trustee a certificate, signed
by an officer of UNBC, stating whether or not the officer knows of any default
by us in the performance, observance or fulfillment of any condition or covenant
of the Indenture.
    
 
REGISTERED GLOBAL SECURITIES
 
   
    We may issue the debt securities of a series in whole or in part in the form
of one or more fully registered global securities (a "Registered Global
Security"). We will deposit any Registered Global Securities with a depositary
or with a nominee for a depositary identified in the applicable prospectus
supplement and registered in the name of such depositary or nominee. In such
case, we will issue one or more Registered Global Securities denominated in an
amount equal to the aggregate principal amount of all of the debt securities of
the series to be issued and represented by such Registered Global Security or
Securities.
    
 
   
    Unless and until it is exchanged in whole or in part for debt securities in
definitive registered form, a Registered Global Security may not be transferred
except as a whole:
    
 
   
    - by the depositary for such Registered Global Security to its nominee,
    
 
   
    - by a nominee of the depositary to the depositary or another nominee of the
      depositary, or
    
 
    - by the depositary or its nominee to a successor of the depositary or a
      nominee of the successor.
 
   
    The prospectus supplement relating to a series of debt securities will
describe the specific terms of the depositary arrangement with respect to any
portion of the series represented by a Registered Global Security. We anticipate
that the following provisions will apply to all depositary arrangements for debt
securities:
    
 
   
    - ownership of beneficial interests in a Registered Global Security will be
      limited to persons that have accounts with the depositary for such
      Registered Global Security, these persons being referred to as
      "participants," or persons that may hold interests through participants;
    
 
                                       23
<PAGE>
   
    - upon the issuance of a Registered Global Security, the depositary for the
      Registered Global Security will credit, on its book-entry registration and
      transfer system, the participants' accounts with the respective principal
      amounts of the debt securities represented by the Registered Global
      Security beneficially owned by the participants;
    
 
   
    - any dealers, underwriters, or agents participating in the distribution of
      the debt securities will designate the accounts to be credited; and
    
 
   
    - ownership of beneficial interest in such Registered Global Security will
      be shown on, and the transfer of such ownership interest will be effected
      only through, records maintained by the depositary for such Registered
      Global Security for interests of participants, and on the records of
      participants for interests of persons holding through participants.
    
 
    The laws of some states may require that certain purchasers of securities
take physical delivery of the securities in definitive form. These laws may
limit the ability of certain persons to own, transfer or pledge beneficial
interests in Registered Global Securities.
 
   
    So long as the depositary for a Registered Global Security, or its nominee,
is the registered owner of such Registered Global Security, the depositary or
such nominee, as the case may be, will be considered the sole owner or holder of
the debt securities represented by the Registered Global Security for all
purposes under the Indenture. Except as stated below, owners of beneficial
interests in a Registered Global Security:
    
 
   
    - will not be entitled to have the debt securities represented by a
      Registered Global Security registered in their names,
    
 
   
    - will not receive or be entitled to receive physical delivery of the debt
      securities in the definitive form,
    
 
   
    - and will not be considered the owners or holders of the debt securities
      under the Indenture.
    
 
   
Accordingly, each person owning a beneficial interest in a Registered Global
Security must rely on the procedures of the depositary for the Registered Global
Security and, if the person is not a participant, on the procedures of a
participant through which the person owns its interest, to exercise any rights
of a holder under the Indenture.
    
 
   
    We understand that under existing industry practices, if we request any
action of holders or if an owner of a beneficial interest in a Registered Global
Security desires to give or take any action that a holder is entitled to give or
take under the Indenture, the depositary for the Registered Global Security
would authorize the participants holding the relevant beneficial interests to
give or take the action, and the participants would authorize beneficial owners
owning through the participants to give or take the action or would otherwise
act upon the instructions of beneficial owners holding through them.
    
 
   
    We will make payments of principal and premium, if any, and interest, if
any, on debt securities represented by a Registered Global Security registered
in the name of a depositary or its nominee to the depositary or its nominee, as
the case may be, as the registered owners of the Registered Global Security.
None of UNBC, the Trustee or any other agent of UNBC or the Trustee will be
responsible or liable for any aspect of the records relating to, or payments
made on account of, beneficial ownership interests in the Registered Global
Security or for maintaining, supervising or reviewing any records relating to
the beneficial ownership interests.
    
 
   
    We expect that the depositary for any debt securities represented by a
Registered Global Security, upon receipt of any payments of principal and
premium, if any, and interest, if any, in respect of the Registered Global
Security, will immediately credit participants' accounts with payments in
amounts proportionate to their respective beneficial interests in the Registered
Global Security as shown on the records of the depositary. We also expect that
standing customer instructions and customary practices will
    
 
                                       24
<PAGE>
   
govern payments by participants to owners of beneficial interests in the
Registered Global Security held through the participants, as is now the case
with the securities held for the accounts of customers in bearer form or
registered in "street name." We also expect that any of these payments will be
the responsibility of the participants.
    
 
   
    If the depositary for any debt securities represented by a Registered Global
Security is at any time unwilling or unable to continue as depositary or stops
being a clearing agency registered under the Exchange Act, we will appoint an
eligible successor depositary. If we fail to appoint an eligible successor
depositary within 90 days, we will issue the debt securities in definitive form
in exchange for the Registered Global Security. In addition, we may at any time
and in our sole discretion decide not to have any of the debt securities of a
series represented by one or more Registered Global Securities. In that event,
we will issue debt securities of the series in a definitive form in exchange for
all of the Registered Global Securities representing the debt securities. The
Trustee will register any debt securities issued in definitive form in exchange
for a Registered Global Security in the name or names as the depositary, based
upon instructions from its participants, shall instruct the Trustee.
    
 
   
    We may also issue bearer debt securities of a series in the form of one or
more global securities, referred to as "bearer global securities." We will
deposit these securities with a common depositary for Euroclear System and Cedel
Bank, SOCIETE ANONYME, or with a nominee for the depositary identified in the
prospectus supplement relating to the series. The prospectus supplement relating
to a series of debt securities represented by a bearer global security will
describe the applicable terms and procedures. These will include the specific
terms of the depositary arrangement and any specific procedures for the issuance
of debt securities in definitive form in exchange for a bearer global security,
with respect to the position of the series represented by a bearer global
security.
    
 
DISCHARGE, DEFEASANCE AND COVENANT DEFEASANCE
 
   
    We can discharge or decrease our obligations under the Indenture as stated
below.
    
 
   
    We may discharge certain obligations to holders of any series of debt
securities that have not already been delivered to the Trustee for cancellation
and that have either become due and payable or are by their terms to become due
and payable, or are scheduled for redemption, within one year. We may effect a
discharge by irrevocably depositing with the Trustee cash or U.S. Government
Obligations, as trust funds, in an amount certified to be enough to pay when
due, whether at maturity, upon redemption or otherwise, the principal of,
premium, if any, and interest on the debt securities and any mandatory sinking
fund payments.
    
 
   
    Unless otherwise provided in the applicable prospectus supplement, we may
also discharge any and all of our obligations to holders of any series of debt
securities at any time ("defeasance"). We may also be released, with respect to
any outstanding series of debt securities, from the obligations imposed by any
covenants of the series of debt securities and certain provisions of the
Indenture, and we may omit to comply with those covenants without creating an
Event of Default ("covenant defeasance"). We may effect defeasance and covenant
defeasance only if, among other things:
    
 
   
    - we irrevocably deposit with the Trustee cash or U.S. Government
      Obligations, as trust funds, in an amount certified to be enough to pay at
      maturity (or upon redemption) the principal, premium, if any, and interest
      on all outstanding debt securities of the series;
    
 
   
    - we deliver to the Trustee an opinion of counsel from a nationally
      recognized law firm to the effect that the holders of the series of debt
      securities will not recognize income, gain or loss for U.S. federal income
      tax purposes as a result of the defeasance or covenant defeasance and that
      defeasance or covenant defeasance will not otherwise alter the holders'
      U.S. federal income tax treatment of principal, premium, if any, and
      interest payments on the series of debt securities; and
    
 
                                       25
<PAGE>
   
    - in the case of subordinated debt securities, no event or condition shall
      exist that, pursuant to the subordination provisions applicable to the
      series, would prevent us from making payments of principal of, premium, if
      any, and interest on any of the applicable subordinated debt securities at
      the date of the irrevocable deposit referred to above or at any time
      during the period ending on the 91st day after the deposit date.
    
 
In the case of a defeasance by us, the opinion we deliver must be based on a
ruling of the Internal Revenue Service issued, or a change in U.S. federal
income tax law occurring, after                         , 1998, since such a
result would not occur under the U.S. federal income tax laws in effect on such
date.
 
    Although we may discharge or decrease our obligations under the Indenture as
described in the two preceding paragraphs, we may not avoid, among other things,
our duty to register the transfer or exchange of any series of debt securities,
to replace any temporary, mutilated, destroyed, lost or stolen series of debt
securities or to maintain an office or agency in respect of any series of debt
securities.
 
MODIFICATION OF THE INDENTURE
 
    The Indenture provides that we and the Trustee may enter into supplemental
indentures without the consent of the holders of debt securities to:
 
   
    - secure any debt securities,
    
 
   
    - evidence the assumption by a successor corporation of our obligations,
    
 
   
    - add covenants for the protection of the holders of debt securities,
    
 
   
    - cure any ambiguity or correct any inconsistency in the Indenture,
    
 
   
    - establish the forms or terms of debt securities of any series, and
    
 
    - evidence and provide for the acceptance of appointment by a successor
      trustee.
 
   
    The Indenture also provides that we and the Trustee may, with the consent of
the holders of not less than a majority in aggregate principal amount of debt
securities of all series of Senior Debt Securities or of Subordinated
Securities, as the case may be, then outstanding and affected, voting as one
class, add any provisions to, or change in any manner, eliminate or modify in
any way the provisions of, the Indenture or modify in any manner the rights of
the holders of the debt securities. We and the Trustee may not, however, without
the consent of the holder of each outstanding debt security affected thereby:
    
 
    - extend the final maturity of any debt security;
 
    - reduce the principal amount or premium, if any;
 
    - reduce the rate or extend the time of payment of interest;
 
    - reduce any amount payable on redemption;
 
   
    - change the currency in which the principal, unless otherwise provided with
      respect to a series, premium, if any, or interest is payable;
    
 
    - reduce the amount of the principal of any debt security issued with an
      original issue discount that is payable upon acceleration or provable in
      bankruptcy;
 
    - alter certain provisions of the Indenture relating to the debt securities
      not denominated in U.S. dollars;
 
    - impair the right to institute suit for the enforcement of any payment on
      any debt security when due; or
 
                                       26
<PAGE>
    - reduce the percentage of holders of debt securities of any series whose
      consent is required for any modification of the Indenture.
 
CONCERNING THE TRUSTEE
 
   
    The Indenture provides that there may be more than one Trustee under the
Indenture, each with respect to one or more series of debt securities. If there
are different Trustees for different series of debt securities, each Trustee
will be a Trustee of a Trust under the Indenture separate and apart from the
Trust administered by any other Trustee under the Indenture. Except as otherwise
indicated in this prospectus or any prospectus supplement, any action permitted
to be taken by a Trustee may be taken by such Trustee only with respect to the
one or more series of debt securities for which it is the Trustee under the
Indenture. Any Trustee under the Indenture may resign or be removed with respect
to one or more series of debt securities. All payments of principal of, premium,
if any, and interest on, and all registration, transfer, exchange,
authentication and delivery of, the debt securities of a series will be effected
by the Trustee with respect to such series at an office designated by such
Trustee in New York, New York.
    
 
   
    If the Trustee becomes a creditor of UNBC, the Indenture places certain
limitations on the right of the Trustee to obtain payment of claims in certain
cases or to realize on certain property received in respect of any such claim as
security or otherwise. The Trustee may engage in other transactions. If it
acquires any conflicting interest relating to any duties with respect to the
debt securities, however, it must eliminate the conflict or resign as Trustee.
    
 
   
    The holders of a majority in aggregate principal amount of any series of
debt securities then outstanding will have the right to direct the time, method
and place of conducting any proceeding for exercising any remedy available to
the Trustee with respect to the applicable series of debt securities, provided
that the direction:
    
 
    - would not conflict with any rule of law or with the Indenture,
 
    - would not be unduly prejudicial to the rights of another holder of the
      debt securities, and
 
    - would not involve any Trustee in personal liability.
 
   
    The Indenture provides that in case an Event of Default shall occur, not be
cured and be known to any Trustee, the Trustee must use the same degree of care
as a prudent person would use in the conduct of his or her own affairs in the
exercise of the Trust's power. The Trustee will be under no obligation to
exercise any of its rights or powers under the Indenture at the request of any
of the holders of the debt securities, unless they shall have offered to the
Trustee security and indemnity satisfactory to the Trustee.
    
 
NO INDIVIDUAL LIABILITY OF INCORPORATORS, SHAREHOLDERS, OFFICERS OR DIRECTORS
 
   
    The Indenture provides that no incorporator and no past, present or future
shareholder, officer or director of UNBC or any successor corporation in their
capacity as such shall have any individual liability for any of our obligations,
covenants or agreements under the debt securities or the Indenture.
    
 
GOVERNING LAW
 
    The Indenture and the debt securities will be governed by, and construed in
accordance with, the laws of the state of New York.
 
                                       27
<PAGE>
DESCRIPTION OF THE TRUST PREFERRED SECURITIES GUARANTEES
 
   
    The following descriptions of the trust preferred securities guarantees are
not complete. You should also read the Trust Preferred Securities Guarantees. We
will file the Trust Preferred Securities Guarantees with the SEC as an exhibit
to the registration statement of which this prospectus is a part.
    
 
GENERAL
 
    UNBC will execute a Trust Preferred Securities Guarantee, which benefits the
holders of trust preferred securities, at the time that a Trust issues those
trust preferred securities. Each Trust Preferred Securities Guarantee will be
qualified as an indenture under the Trust Indenture Act. Unless otherwise stated
in a prospectus supplement, The First National Bank of Chicago will act as
indenture trustee ("Trust Preferred Guarantee Trustee") under each Trust
Preferred Securities Guarantee for the purposes of compliance with the Trust
Indenture Act. The Trust Preferred Guarantee Trustee will hold each Trust
Preferred Securities Guarantee for the benefit of the preferred securities
holders of the applicable Trust.
 
   
    UNBC will agree, as described in each Trust Preferred Securities Guarantee,
to pay in full to the holders of the trust preferred securities issued by the
applicable Trust, the Trust Preferred Securities Guarantee Payments, when and as
due, regardless of any defense, right of set-off or counterclaim which the Trust
may have or assert. The following payments ("Trust Preferred Securities
Guarantee Payments"), to the extent not previously paid by a Trust, will be
covered by the applicable Trust Preferred Securities Guarantee:
    
 
    - any accrued and unpaid distributions required to be paid on the applicable
      trust preferred securities, to the extent that the Trust has funds
      available to make the payment;
 
    - the redemption price, to the extent that the Trust has funds available to
      make the payment; and
 
   
    - upon a voluntary or involuntary dissolution and liquidation of the Trust,
      other than in connection with a distribution of debt securities to holders
      of the applicable trust preferred securities or the redemption of all the
      trust preferred securities, the lesser of
    
 
       (1) the aggregate of the liquidation amount specified in the prospectus
           supplement for each trust preferred security plus all accrued and
           unpaid distributions on the trust preferred securities to the date of
           payment, to the extent the Trust has funds available to make the
           payment and
 
   
       (2) the amount of assets of the Trust remaining available for
           distribution to holders of its trust preferred securities upon a
           dissolution and liquidation of the Trust (either, a "Liquidation
           Payment").
    
 
    Our obligation to make a Trust Preferred Securities Guarantee Payment may be
satisfied by directly paying the required amounts to the holders of the trust
preferred securities or by causing the Trust to pay the amounts to the holders.
 
    No single document executed by UNBC relating to the issuance of trust
preferred securities will provide for its full, irrevocable and unconditional
guarantee of the trust preferred securities. It is only the combined operation
of our obligations under the Indenture and the applicable Trust Preferred
Securities Guarantee and Declaration that has the effect of providing a full,
irrevocable and unconditional guarantee of a Trust's obligations under its trust
preferred securities.
 
                                       28
<PAGE>
STATUS OF THE TRUST PREFERRED SECURITIES GUARANTEES
 
    Each Trust Preferred Securities Guarantee will constitute an unsecured
obligation of UNBC and will rank:
 
   
    - subordinate and junior in right of payment to all of our other
      liabilities, except those obligations made equal or junior to its
      obligations under a Trust Preferred Securities Guarantee;
    
 
   
    - equal with the most senior preferred or preference stock now or hereafter
      issued by us, and with any guarantee now or hereafter issued by us in
      respect of any preferred or preference stock of any of our affiliates; and
    
 
   
    - senior to our common stock.
    
 
   
    Each Declaration will require that the holder of trust preferred securities
accept the subordination provisions and other terms of the Trust Preferred
Securities Guarantee. Each Trust Preferred Securities Guarantee will constitute
a guarantee of payment and not of collection. In other words, the holder of the
guaranteed security may sue us, or seek other remedies, to enforce its rights
under the Trust Preferred Securities Guarantee without first suing any other
person or entity. A Trust Preferred Securities Guarantee will not be discharged
except:
    
 
   
    - upon payment of the Trust Preferred Securities Guarantee Payments in full
      to the extent not previously paid,
    
 
   
    - upon distribution of the underlying securities to the holders of trust
      preferred securities upon any conversion or exchange of the holder's trust
      preferred securities into the designated securities, or
    
 
   
    - upon distribution to the applicable holders of trust preferred securities
      of the corresponding series of debt securities pursuant to the appropriate
      Declaration.
    
 
AMENDMENTS AND ASSIGNMENT
 
   
    Changes to the Trust Preferred Securities Guarantee that do not adversely
affect the rights of holders of trust preferred securities in any material
respect may be made without the consent of those holders. Otherwise, a Trust
Preferred Securities Guarantee may only be amended with the prior approval of
the holders of at least a majority in aggregate liquidation amount of the
affected trust preferred securities, excluding any affected trust preferred
securities held by us or any of our affiliates. A description of the way to
obtain any approval is described under "Description of the Trust Preferred
Securities--Voting Rights; Amendment of Declarations." All guarantees and
agreements contained in the Trust Preferred Securities Guarantee will be binding
on our successors, assigns, receivers, trustees and representatives and are for
the benefit of the holders of the applicable trust preferred securities.
    
 
TRUST PREFERRED SECURITIES GUARANTEE EVENTS OF DEFAULT
 
   
    An event of default under a Trust Preferred Securities Guarantee occurs if:
    
 
   
    - we fail to make any of our required payments or perform our obligations
      under the Trust Preferred Securities Guarantee, or
    
 
   
    - we fail to deliver the designated securities upon an appropriate election
      by the holder of related trust preferred securities to convert or exchange
      the trust preferred securities into the designated securities, as
      applicable.
    
 
   
    The holders of at least a majority in aggregate liquidation amount of the
trust preferred securities relating to each Trust Preferred Securities
Guarantee, excluding any trust preferred securities held by us or any of our
affiliates, will have the right to direct the time, method and place of
conducting any proceeding for any remedy available to the Trust Preferred
Guarantee Trustee relating to such Trust Preferred
    
 
                                       29
<PAGE>
Securities Guarantee or to direct the exercise of any Trust or power given to
the Trust Preferred Guarantee Trustee under such Trust Preferred Securities
Guarantee.
 
INFORMATION CONCERNING THE TRUST PREFERRED GUARANTEE TRUSTEE
 
   
    The Trust Preferred Guarantee Trustee under a Trust Preferred Securities
Guarantee, other than during the occurrence and continuation of a default under
such Trust Preferred Securities Guarantee, will only perform the duties that are
specifically described in the Trust Preferred Securities Guarantee. Upon the
occurrence of a default, the Trust Preferred Guarantee Trustee will exercise the
same degree of care and skill as a prudent person would exercise or use in the
conduct of his or her own affairs. A Trust Preferred Guarantee Trustee is under
no obligation to exercise any of its powers as described in the applicable Trust
Preferred Securities Guarantee at the request of any holder of covered trust
preferred securities unless it is offered reasonable security and indemnity
against the costs, expenses and liabilities that it might incur.
    
 
TERMINATION OF THE TRUST PREFERRED SECURITIES GUARANTEE
 
   
    Each Trust Preferred Securities Guarantee will terminate once the applicable
trust preferred securities are paid in full upon distribution of the underlying
securities to the holders of trust preferred securities, upon any conversion or
exchange of the holder's trust preferred securities into the designated
securities, or upon distribution of the corresponding series of debt securities
to the holders of the applicable trust preferred securities. Each Trust
Preferred Securities Guarantee will continue to be effective or will be
reinstated if at any time any holder of trust preferred securities issued by the
applicable Trust must restore payment of any sums paid under such trust
preferred securities or such Trust Preferred Securities Guarantee.
    
 
GOVERNING LAW
 
    The Trust Preferred Securities Guarantees will be governed by and construed
in accordance with the laws of the state of New York.
 
                                       30
<PAGE>
     RELATIONSHIP AMONG THE TRUST PREFERRED SECURITIES, THE TRUST PREFERRED
        SECURITIES GUARANTEE AND THE DEBT SECURITIES HELD BY EACH TRUST
 
   
    UNBC will guarantee payments of distributions and redemption and liquidation
payments due on each series of the trust preferred securities, to the extent the
applicable Trust has funds available for the payments, as described under
"Description of the Trust Preferred Securities Guarantees." No single document
executed by us in connection with the issuance of any series of the trust
preferred securities will provide for its full, irrevocable and unconditional
guarantee of any trust preferred securities. It is only the combined operation
of our obligations under the applicable Trust Preferred Securities Guarantee,
Declaration and the Indenture that has the effect of providing a full,
irrevocable and unconditional guarantee of the Trust's obligations under its
trust preferred securities.
    
 
   
    As long as we make payments of interest and other payments when due on the
debt securities held by a Trust, those payments will be sufficient to cover the
payment of distributions and redemption and liquidation payments due on the
trust preferred securities issued by that Trust, primarily because:
    
 
    - the aggregate principal amount of the debt securities will be equal to the
      sum of the aggregate liquidation amount of the trust preferred and trust
      common securities;
 
    - the interest rate and interest and other payment dates on the debt
      securities will match the distribution rate and distribution and other
      payment dates for the trust preferred securities;
 
   
    - we will pay for any and all costs, expenses and liabilities of each Trust,
      except such Trust's obligations under its trust preferred securities; and
    
 
    - each Declaration provides that the related Trust will not engage in any
      activity that is not consistent with the limited purposes of the Trust.
 
   
    If and to the extent that we do not make payments on the debt securities,
the applicable Trust will not have funds available to make payments of
distributions or other amounts due on its trust preferred securities. In those
circumstances, you will not be able to rely upon the Trust Preferred Securities
Guarantee for payment of these amounts. Instead, you may directly sue us or seek
other remedies to collect your pro rata share of payments owed. If you sue us to
collect payment, then we will assume your rights as a holder of trust preferred
securities under the Trust's Declaration to the extent we make a payment to you
in any legal action.
    
 
   
    A holder of any trust preferred security may sue us, or seek other remedies,
to enforce its rights under the Preferred Securities Guarantee without first
suing the applicable Preferred Guarantee Trustee, the Trust that issued the
preferred security or any other person or entity.
    
 
                              PLAN OF DISTRIBUTION
 
   
    UNBC may sell common stock, preferred stock, depositary shares or any series
of debt securities and a Trust may sell trust preferred securities in one or
more of the following ways from time to time:
    
 
    - to underwriters or dealers for resale to the public or to institutional
      investors;
 
    - directly to institutional investors; or
 
    - through agents to the public or to institutional investors.
 
   
    The prospectus supplements will state the terms of the offering of the
securities, including:
    
 
    - the name or names of any underwriters or agents,
 
   
    - the purchase price of the securities,
    
 
   
    - the proceeds to UNBC or the applicable Trust, as the case may be, from the
      sale,
    
 
                                       31
<PAGE>
    - any underwriting discounts or agency fees and other items constituting
      underwriters' or agents' compensation,
 
    - any initial public offering price,
 
   
    - any discounts or concessions allowed or reallowed or paid to dealers, and
    
 
    - any securities exchanges on which such securities may be listed.
 
   
    If underwriters are used in the sale, the underwriters will acquire the
securities for their own account and may resell them from time to time in one or
more transactions, including negotiated transactions, at a fixed public offering
price or at varying prices determined at the time of sale.
    
 
   
    If a dealer is used in the sale, UNBC and/or a Trust, as the case may be,
will sell such securities to the dealer, as principal. The dealer may then
resell the securities to the public at varying prices to be determined by the
dealer at the time for resale.
    
 
   
    Unless otherwise set forth in a prospectus supplement, there will be
conditions to the underwriters' obligations to purchase any series of
securities, and the underwriters will be obligated to purchase all of a series
of securities, if any are purchased.
    
 
   
    Underwriters and agents may be entitled under agreements entered into with
UNBC and/or a Trust to indemnification by UNBC and/or a Trust against certain
civil liabilities, including liabilities under the Securities Act, or to
contribution with respect to payments that the underwriters or agents may be
required to make in respect thereof. Underwriters and agents may be customers
of, engage in transactions with, or perform services for us and our affiliates
in the ordinary course of business.
    
 
   
    Other than the common stock, which is listed on the Nasdaq National Market,
each of the securities issued hereunder will be a new issue of securities and
will have no prior trading market. Any common stock sold pursuant to a
prospectus supplement will be quoted on the Nasdaq National Market, subject to
official notice of issuance. Any underwriters to whom UNBC or a Trust sells
securities for public offering and sale may make a market in the securities, but
no underwriter will be obligated to do so and may discontinue any market making
at any time without notice. The securities may or may not be listed on a
national securities exchange.
    
 
                                 LEGAL OPINIONS
 
    The validity of the securities being offered hereby is being passed upon for
UNBC and each Trust by Skadden, Arps, Slate, Meagher & Flom LLP, Los Angeles,
California.
 
   
                                    EXPERTS
    
 
   
    The consolidated financial statements incorporated in this prospectus by
reference from Form 8-K of UnionBanCal Corporation dated January 8, 1999, have
been audited by Deloitte & Touche LLP, independent auditors, as stated in their
report incorporated in this prospectus by reference, and have been so
incorporated in reliance upon the report of such firm given upon their authority
as experts in accounting and auditing. The consolidated financial statements
give retroactive effect to the 1996 merger of BanCal Tri-State Corporation and
Union Bank which has been accounted for as a pooling-of-interests. The
consolidated statements of income, changes in shareholders' equity, and cash
flows of Union Bank and subsidiaries for the year ended December 31, 1995 (not
presented separately in Form 8-K) were audited by Arthur Andersen LLP,
independent public accountants, as stated in their report also incorporated by
reference herein, in reliance upon the authority of such firm as experts in
giving said report.
    
 
                                       32
<PAGE>
   
                      WHERE YOU CAN FIND MORE INFORMATION
    
 
   
    We file reports, proxy statements, and other information with the SEC. Such
reports, proxy statements, and other information concerning UnionBanCal
Corporation can be read and copied at the SEC's Public Reference Room at 450
Fifth Street, N.W., Washington, D.C. 20549. Please call the SEC at
1-800-SEC-0330 for further information on the Public Reference Room. The SEC
maintains an internet site at http://www.sec.gov that contains reports, proxy
and information statements and other information regarding issuers that file
electronically with the SEC, including UnionBanCal Corporation. Our common stock
is quoted on the Nasdaq Stock Market's National Market System. These reports,
proxy statements and other information are also available for inspection at the
offices of the National Association of Securities Dealers, Inc., Report Section,
1735 K Street N.W., Washington, D.C. 20006.
    
 
   
    This prospectus is part of a registration statement filed with the SEC by us
and the trusts. The full registration statement can be obtained from the SEC as
indicated above, or from us.
    
 
   
    The SEC allows UnionBanCal Corporation to "incorporate by reference" the
information we file with the SEC. This permits us to disclose important
information to you by referring to these filed documents. Any information
referred to in this way is considered part of this prospectus, and any
information filed with the SEC by us after the date of this prospectus will
automatically be deemed to update and supersede this information. We incorporate
by reference the following documents that have been filed with the SEC:
    
 
   
    - Annual Report on Form 10-K for the year ended December 31, 1997 and all
      amendments thereto (except for Item 8, "Financial Statements and
      Supplementary Data," which has been updated and incorporated by reference
      in this prospectus;
    
 
   
    - Quarterly Reports on Form 10-Q for the quarters ended March 31, 1998, June
      30, 1998 and September 30, 1998 and all amendments thereto;
    
 
   
    - Current Report on Form 8-K dated August 10, 1998;
    
 
   
    - Current Report on Form 8-K dated December 7, 1998; and
    
 
   
    - Current Report on Form 8-K dated January 8, 1999.
    
 
   
    UnionBanCal Corporation also incorporates by reference any future filings
made with the SEC pursuant to Sections 13(a), 13(c), 14 or 15(d) of the
Securities Exchange Act of 1934 until we file a post-effective amendment which
indicates the termination of the offering of the securities made by this
prospectus.
    
 
   
    We will provide without charge upon written or oral request a copy of any or
all of the documents that are incorporated by reference into this prospectus,
other than exhibits which are specifically incorporated by reference into such
documents. Requests should be directed to Investor Relations, UnionBanCal
Corporation, 400 California Street, San Francisco, California 94104 (telephone
415-765-2969).
    
 
   
    There are no separate financial statements of the trusts in this prospectus.
We do not believe such financial statements would be helpful because:
    
 
   
    - The trusts are subsidiaries of UnionBanCal Corporation, which files
      consolidated financial information under the Exchange Act.
    
 
   
    - The trusts do not have any independent operations other than issuing the
      preferred and common securities and purchasing the debt securities of
      UnionBanCal Corporation.
    
 
   
    - The trusts' only material assets will be the debt securities of
      UnionBanCal Corporation when issued.
    
 
   
    - The combined obligations of UnionBanCal Corporation under the debt
      securities, the trust preferred securities guarantees, the declarations
      and the indenture have the effect of providing a
    
 
                                       33
<PAGE>
   
      full, irrevocable and unconditional guarantee of the trusts' obligations
      under their trust preferred securities. See "Description of Debt
      Securities," "Description of the Trust Preferred Securities Guarantees"
      and "Relationship Among the Trust Preferred Securities, the Trust
      Preferred Securities Guarantee and the Debt Securities Held by Each
      Trust."
    
 
                                       34
<PAGE>
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
   
    The following table presents the expenses to be borne by UNBC and The Bank
of Tokyo-Mitsubishi in connection with the offerings described in this
Registration Statement. UNBC and The Bank of Tokyo-Mitsubishi will each pay 50%
of the registration-related expenses. All expenses listed, other than the
Securities and Exchange Commission registration fee, are estimates.
    
 
<TABLE>
<S>                                                                 <C>
Securities and Exchange Commission Registration Fee...............  $ 208,500
Transfer Agents, Trustees and Depositary's Fees and Expenses......
Printing and Engraving Fees and Expenses..........................
Accounting Fees and Expenses......................................
Blue Sky Fees and Expenses........................................
Legal Fees........................................................
Rating Agency Fees................................................
Miscellaneous (including Listing Fees, if applicable).............
                                                                    ---------
    Total.........................................................  $
                                                                    ---------
                                                                    ---------
</TABLE>
 
ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
    As authorized by Section 317 of the CGCL, each director and officer of UNBC
may be indemnified by UNBC against expenses (including attorney's fees,
judgments, fines and amounts paid in settlement) actually and reasonably
incurred in connection with the defense or settlement of any threatened, pending
or completed legal proceedings in which such person is involved by reason of the
fact that such person is or was a director or officer of UNBC if such person
acted in good faith and in a manner that such person reasonably believed to be
in the best interests of UNBC and, with respect to any criminal action or
proceeding, if such person had no reasonable cause to believe that his conduct
was unlawful. If the legal proceeding, however, is by or in the right of UNBC,
the director or officer may not be indemnified in respect of any claim, issue or
matter as to which such person shall have been adjudged to be liable for
negligence or misconduct in the performance of his duty to UNBC unless a court
determines otherwise.
 
    In addition, we maintain a directors' and officers' liability policy.
 
    Article VII of the Articles of Incorporation and Section 55 of the Bylaws
provide that, to the fullest extent permitted by law, directors of UNBC will not
be liable for monetary damages to UNBC or its shareholders for breaches of their
fiduciary duties.
 
ITEM 16.  EXHIBITS
 
    The following is a list of all exhibits filed as a part of this Registration
Statement on Form S-3, including those incorporated herein by reference.
 
   
<TABLE>
<CAPTION>
EXHIBIT
NUMBER DESCRIPTION OF EXHIBITS
- ------ --------------------------------------------------------------------------
<C>    <S>
 
  4.1  Specimen Certificate representing shares of Common Stock
 
  4.2  Corrected Certificate of Trust of UnionBanCal Finance Trust I
 
  4.3  Corrected Certificate of Trust of UnionBanCal Finance Trust II
 
  4.4  Corrected Certificate of Trust of UnionBanCal Finance Trust III
 
  4.5  Corrected Certificate of Trust of UnionBanCal Finance Trust IV
</TABLE>
    
 
                                      II-1
<PAGE>
   
<TABLE>
<CAPTION>
EXHIBIT
NUMBER DESCRIPTION OF EXHIBITS
- ------ --------------------------------------------------------------------------
<C>    <S>
  4.6  Declaration of Trust of UnionBanCal Finance Trust I
 
  4.7  Declaration of Trust of UnionBanCal Finance Trust II
 
  4.8  Declaration of Trust of UnionBanCal Finance Trust III
 
  4.9  Declaration of Trust of UnionBanCal Finance Trust IV
 
  4.10* Form of Amended and Restated Declaration of Trust of UnionBanCal Finance
         Trust I
 
  4.11* Form of Amended and Restated Declaration of Trust of UnionBanCal Finance
         Trust II (included in Exhibit 4.10)
 
  4.12* Form of Amended and Restated Declaration of Trust of UnionBanCal Finance
         Trust III (included in Exhibit 4.10)
 
  4.13* Form of Amended and Restated Declaration of Trust of UnionBanCal Finance
         Trust IV (included in Exhibit 4.10)
 
  4.14* Form of Indenture
 
  4.15* Form of Trust Preferred Security (included in Exhibit 4.10)
 
  4.16* Form of Preferred Securities Guarantee Agreement with respect to Trust
         Preferred Securities to be issued by UnionBanCal Finance Trust I
 
  4.17* Form of Preferred Securities Guarantee Agreement with respect to Trust
         Preferred Securities to be issued by UnionBanCal Finance Trust II
         (included in Exhibit 4.16)
 
  4.18* Form of Preferred Securities Guarantee Agreement with respect to Trust
         Preferred Securities to be issued by UnionBanCal Finance Trust III
         (included in Exhibit 4.16)
 
  4.19* Form of Preferred Securities Guarantee Agreement with respect to Trust
         Preferred Securities to be issued by UnionBanCal Finance Trust IV
         (included in Exhibit 4.16)
 
  4.20* Form of Preferred Stock
 
  4.21* Form of Deposit Agreement
 
  4.22* Form of Depositary Share (included in Exhibit 4.21)
 
  5.1* Opinion of Skadden, Arps, Slate, Meagher & Flom LLP as to the legality of
         the Common Stock, Preferred Stock, Debt Securities; Trust Preferred
         Securities and Trust Preferred Securities Guarantee
 
 12.1* Statement re: Computation of Ratios of Earnings to Fixed Charges and of
         Earnings to Combined Fixed Charges and Preferred Stock Dividends of UNBC
 
 23.1  Consent of Deloitte & Touche LLP, Independent Auditors
 
 23.2  Consent of Arthur Andersen LLP, Independent Accountants
 
 23.3* Consent of Skadden, Arps, Slate, Meagher & Flom LLP (included in Exhibit
         5.1)
 
 24.1** Power of Attorney of certain officers and directors of UNBC
 
 25.1* Statement of Eligibility on Form T-1 under the Trust Indenture Act of
         1939, as amended, of The First National Bank of Chicago, as Trustee
         under the Indenture
</TABLE>
    
 
- ------------------------
 
 *  To be filed by amendment or as an exhibit to a document to be incorporated
    or deemed to be incorporated by reference in the Registration Statement.
 
   
**  Previously filed.
    
 
                                      II-2
<PAGE>
ITEM 17.  UNDERTAKINGS
 
    The undersigned registrants hereby undertake:
 
    (1) To file, during any period in which offers or sales are being made, a
post-effective amendment to this registration statement:
 
        (i) To include any prospectus required by Section 10(a)(3) of the
    Securities Act of 1933;
 
        (ii) To reflect in the prospectus any facts or events arising after the
    effective date of the registration statement (or the most recent
    post-effective amendment thereof) which, individually or in the aggregate,
    represent a fundamental change in the information set forth in the
    registration statement. Notwithstanding the foregoing, any increase or
    decrease in volume of securities offered (if the total dollar value of
    securities offered would not exceed that which was registered) and any
    deviation from the low or high end of the estimated maximum offering range
    may be reflected in the form of prospectus filed with the Commission
    pursuant to Rule 424(b) if, in the aggregate, the changes in volume and
    price represent no more than a 20 percentage change in the maximum aggregate
    offering price set forth in the "Calculation of Registration Fee" table in
    the effective registration statement;
 
       (iii) To include any material information with respect to the plan of
    distribution not previously disclosed in the registration statement or any
    material change to such information in the registration statement;
 
PROVIDED, HOWEVER, that paragraphs (1)(i) and 1(ii) do not apply if the
registration statement is on Form S-3 or Form S-8 or Form F-3, and the
information required to be included in a post-effective amendment by those
paragraphs is contained in periodic reports filed with or furnished to the
Commission by the registrants pursuant to Section 13 or Section 15(d) of the
Securities Exchange Act that are incorporated by reference in the registration
statement;
 
    (2) That, for the purpose of determining any liability under the Securities
Act of 1933, each such post-effective amendment shall be deemed to be a new
registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof;
 
    (3) To remove from registration by means of a post-effective amendment any
of the securities being registered which remain unsold at the termination of the
offering.
 
    The undersigned registrants hereby undertake that, for purposes of
determining any liability under the Securities Act of 1933, each filing of each
of the registrant's annual report pursuant to Section 13(a) or Section 15(d) of
the Securities Exchange Act that is incorporated by reference in the
registration statement shall be deemed to be a new registration statement
relating to the securities offered herein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.
 
    Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers and controlling persons of any
of the registrants pursuant to the provisions set forth in Item 15, or
otherwise, each of the registrants has been advised that in the opinion of the
SEC such indemnification is against public policy as expressed in the Act and
is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by one of the registrants of
expenses incurred or paid by a director, officer or controlling registrant of
expenses incurred or paid by a director, officer or controlling person of one of
the registrants in the successful defense of any action, suit or proceeding) is
asserted by such director, officer or controlling person in connection with the
securities being registered, each of the registrants will, unless in the opinion
of its counsel the matter has been settled by controlling precedent, submit to a
court of appropriate jurisdiction the question whether such indemnification by
it is against public policy as expressed in the Act and will be governed by the
final adjudication of such issue.
 
                                      II-3
<PAGE>
    The undersigned registrants undertake that:
 
    (1) For purposes of determining any liability under the Securities Act of
1933, the information omitted from the form of prospectus filed as part of this
registration statement in reliance upon Rule 430A and contained in a form of
prospectus filed by the registrant pursuant to Rule 424(b) (1) or (4) or 497(h)
under the Securities Act shall be deemed to be part of this registration
statement as of the time it was declared effective.
 
    (2) For the purpose of determining any liability under the Securities Act of
1933, each post-effective amendment that contains a form of prospectus shall be
deemed to be a new registration statement relating to the securities offered
therein, and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.
 
    The undersigned registrants hereby undertake to file an application for the
purpose of determining the eligibility of the trustee to act under subsection
(a) of Section 310 of the Trust Indenture Act in accordance with the rules and
regulations prescribed by the Commission under Section 305(b)(2) of the Act.
 
                                      II-4
<PAGE>
                                   SIGNATURES
 
   
    Pursuant to the requirements of the Securities Act of 1933, the registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on this Form S-3 and has duly caused this Amendment No.
1 to Registration Statement to be signed on its behalf by the undersigned,
thereunto duly authorized, in the City of San Francisco, State of California, on
this 8th day of January, 1999.
    
 
   
<TABLE>
<S>                             <C>  <C>
                                UNIONBANCAL CORPORATION
 
                                By:            /s/ TAKAHIRO MORIGUCHI
                                     -----------------------------------------
                                                 Takahiro Moriguchi
                                       PRESIDENT AND CHIEF EXECUTIVE OFFICER
</TABLE>
    
 
   
    Pursuant to the requirements of the Securities Act, this Amendment No. 1 to
Registration Statement has been signed below by the following persons in the
capacities indicated on January 8, 1999.
    
 
   
<TABLE>
<CAPTION>
             SIGNATURES                              TITLE
- ------------------------------------  ------------------------------------
 
<C>                                   <S>
       /s/ TAKAHIRO MORIGUCHI         President and Chief Executive
- ------------------------------------    Officer and Director
         Takahiro Moriguchi             (Principal Executive Officer)
 
                 *
- ------------------------------------  Deputy Chairman of the Board
          Yoshihiko Someya
 
                 *                    Executive Vice President and Chief
- ------------------------------------    Financial Officer
          David I. Matson               (Principal Financial Officer)
 
                 *
- ------------------------------------  Senior Vice President and Controller
         David A. Anderson              (Principal Accounting Officer)
 
                 *
- ------------------------------------  Chairman of the Board
            Kaoru Hayama
 
                 *
- ------------------------------------  Vice Chairman of the Board
        Richard C. Hartnack
 
                 *
- ------------------------------------  Vice Chairman of the Board
          Robert M. Walker
</TABLE>
    
 
                                      II-5
<PAGE>
   
<TABLE>
<CAPTION>
             SIGNATURES                              TITLE
- ------------------------------------  ------------------------------------
 
<C>                                   <S>
                 *
- ------------------------------------  Director
         Richard D. Farman
 
                 *
- ------------------------------------  Director
         Stanley F. Farrar
 
                 *
- ------------------------------------  Director
         Herman E. Gallegos
 
                 *
- ------------------------------------  Director
          Jack L. Hancock
 
                 *
- ------------------------------------  Director
            Harry W. Low
 
                 *
- ------------------------------------  Director
            Mary S. Metz
 
                 *
- ------------------------------------  Director
          Raymond E. Miles
 
                 *
- ------------------------------------  Director
         J. Fernando Niebla
 
                 *
- ------------------------------------  Director
         Sidney R. Petersen
 
                 *
- ------------------------------------  Director
         Carl W. Robertson
 
                 *
- ------------------------------------  Director
          Henry T. Swigert
</TABLE>
    
 
   
                                      II-6
    
<PAGE>
   
<TABLE>
<CAPTION>
             SIGNATURES                              TITLE
- ------------------------------------  ------------------------------------
 
<C>                                   <S>
                 *
- ------------------------------------  Director
            Tsuneo Wakai
 
                 *
- ------------------------------------  Director
          Hiroshi Watanabe
 
- ------------------------------------  Director
          Blenda J. Wilson
 
- ------------------------------------  Director
          Kenji Yoshizawa
</TABLE>
    
 
   
<TABLE>
<S>   <C>                        <C>                         <C>
*By:   /s/ TAKAHIRO MORIGUCHI
      -------------------------
         Takahiro Moriguchi
          ATTORNEY-IN-FACT
</TABLE>
    
 
                                      II-7
<PAGE>
   
                                   SIGNATURES
    
 
   
    Pursuant to the requirements of the Securities Act of 1933, UnionBanCal
Finance Trust I, UnionBanCal Finance Trust II, UnionBanCal Finance Trust III and
UnionBanCal Finance Trust IV, each certifies that it has reasonable grounds to
believe that it meets all of the requirements for filing on Form S-3, and has
duly caused this Amendment No. 1 to Registration Statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of San
Francisco, State of California, on January 8, 1999.
    
 
   
<TABLE>
<S>                             <C>  <C>
                                UNIONBANCAL FINANCE TRUST I
 
                                By: UnionBanCal Corporation, as Sponsor
 
                                By:  /s/ DAVID I. MATSON
                                     -----------------------------------------
                                     Name: David I. Matson
                                     Title:Executive Vice President and
                                           Chief Financial Officer
 
                                UNIONBANCAL FINANCE TRUST II
 
                                By: UnionBanCal Corporation, as Sponsor
 
                                By:  /s/ DAVID I. MATSON
                                     -----------------------------------------
                                     Name: David I. Matson
                                     Title:Executive Vice President and
                                           Chief Financial Officer
 
                                UNIONBANCAL FINANCE TRUST III
 
                                By: UnionBanCal Corporation, as Sponsor
 
                                By:  /s/ DAVID I. MATSON
                                     -----------------------------------------
                                     Name: David I. Matson
                                     Title:Executive Vice President and
                                           Chief Financial Officer
 
                                UNIONBANCAL FINANCE TRUST IV
 
                                By: UnionBanCal Corporation, as Sponsor
 
                                By:  /s/ DAVID I. MATSON
                                     -----------------------------------------
                                     Name: David I. Matson
                                     Title:Executive Vice President and
                                           Chief Financial Officer
</TABLE>
    
 
                                      II-8

<PAGE>

                                                                     Exhibit 4.1
<TABLE>
<S><C>
      COMMON STOCK                                                                                    COMMON STOCK

       UB                                                    UNIONBANCAL
                                                             CORPORATION

INCORPORATED UNDER THE LAWS OF                                                                 SEE REVERSE FOR STATEMENTS RELATING
   THE STATE OF CALIFORNIA                                                                            TO RIGHTS, PREFERENCES,
                                                                                                PRIVILEGES AND RESTRICTIONS, IF ANY
                                                                                                        CUSIP 908906 10 0



     THIS CERTIFIES THAT







     IS THE RECORD HOLDER OF


                                     FULLY PAID AND NONASSESSABLE SHARES OF THE COMMON STOCK OF

                                                        UnionBanCal Corporation


                                                          CERTIFICATE OF STOCK


     transferable on the books of the Corporation by the holder hereof in person or by duly authorized attorney upon surrender of 
     this certificate properly endorsed. This certificate is not valid until countersigned and registered by the Transfer Agent and
     Registrar.
          WITNESS the facsimile seal of the Corporation and the facsimile signatures of its duly authorized officers.

     Dated:




                     -----------------------                                              -----------------------------------------
                       CORPORATE SECRETARY                       [SEAL]                       PRESIDENT AND CHIEF EXECUTIVE OFFICER

</TABLE>

COUNTERSIGNED AND REGISTERED:

  HARRIS TRUST COMPANY OF CALIFORNIA
                       TRANSFER AGENT
                        AND REGISTRAR

By

             AUTHORIZED SIGNATURE

<PAGE>

     A statement of the rights, preferences, privileges and restrictions granted
to or imposed upon the respective classes or series of shares and upon the
holders thereof as established, from time to time, by the Articles of
Incorporation of the Corporation and by any certificate of determination, and
the number of shares constituting each class and series and the designations
thereof, may be obtained by the holder hereof upon written request and without
charge from the Secretary of the Corporation at its corporate headquarters.

     The following abbreviations, when used in the inscription on the face of
this certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

<TABLE>
<CAPTION>
 

     <S><C>
     TEN COM -- as tenants in common                   UNIF GIFT MIN ACT --                   Custodian
     TEN ENT -- as tenants by the entireties                                ------------------          ------------------
     JT TEN  -- as joint tenants with right of                                    (Cust)                      (Minor)
                survivorship and not as tenants                             under Uniform Gifts to Minors
                in common                                                   Act
                                                                               -------------------------------------------
                                                                                                (State)
                                                       UNIF TRF MIN ACT  --               Custodian (until age           )
                                                                            --------------                    -----------
                                                                                (Cust)
                                                                                                   under Uniform Transfers
                                                                            -----------------------
                                                                                    (Minor)
                                                                            to Minors Act
                                                                                         ---------------------------------
                                                                                                       (State)
</TABLE>
 



        Additional abbreviations may also be used though not in the above list.


 FOR VALUE RECEIVED, __________________ hereby sell, assign and transfer unto


PLEASE INSERT SOCIAL SECURITY OR OTHER
    IDENTIFYING NUMBER OF ASSIGNEE
- --------------------------------------

- --------------------------------------


- --------------------------------------------------------------------------------
 (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

- --------------------------------------------------------------------------------


- --------------------------------------------------------------------------------


- --------------------------------------------------------------------------Shares
of the capital stock represented by the within Certificate, and do hereby
irrevocably constitute and appoint


- ------------------------------------------------------------------------Attorney
to transfer the said stock on the books of the within named Corporation with
full power of substitution in the premises.

Dated
     ------------------------


                              X
                               -------------------------------------------------
                              X
                               -------------------------------------------------
                               THE SIGNATURE(S) TO THIS ASSIGNMENT MUST
                               CORRESPOND WITH THE NAME(S) AS WRITTEN UPON THE
                      NOTICE:  FACE OF THE CERTIFICATE IN EVERY PARTICULAR,
                               WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE
                               WHATEVER.

Signature(s) Guaranteed





By
  --------------------------------------------------
THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE
GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS
AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH
MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE
MEDALLION PROGRAM), PURSUANT TO S.E.C. RULE 17Ad-15.



<PAGE>

                                                                     Exhibit 4.2


                                      CORRECTED
                                 CERTIFICATE OF TRUST
                                          OF
                             UNIONBANCAL FINANCE TRUST I


                        --------------------------------------

                 Pursuant to Section 3810(e) of Title 12, Chapter 38 
                                of the Delaware Code 

                        --------------------------------------

          The name of the business trust is UnionBanCal Finance Trust I (the
"Trust").

          The Trust filed a Certificate of Trust on November 17, 1998 which
erroneously omitted the signatures of three of the Trustees.

          The Certificate of Trust of the Trust is hereby corrected to read in
its entirety as follows:

                                CERTIFICATE OF TRUST
                                          OF
                             UNIONBANCAL FINANCE TRUST I


          The undersigned, the trustees of UnionBanCal Finance Trust I, desiring
to form a business trust pursuant to Delaware Business Trust Act, 12 DEL. C.
Section 3810 hereby certify as follows:

          1.   The name of the business trust being formed hereby is UnionBanCal
               Finance Trust I (the "Trust").

          2.   The name and business address of the trustee of the Trust with a
               principal place of business in the State of Delaware is as
               follows:

               First Chicago Delaware Inc.
               300 King Street
               Wilmington, DE  19801

<PAGE>

                         FIRST CHICAGO DELAWARE INC., as
                          Delaware Trustee

                         By:     /s/ Lawrence Dillard   
                            -------------------------------------------------
                              Name: Lawrence Dillard
                              Title: First Vice President



                         THE FIRST NATIONAL BANK OF CHICAGO, as
                          Property Trustee

                         By:     /s/ Lawrence Dillard 
                            --------------------------------------------------
                              Name: Lawrence Dillard
                              Title: First Vice President
                                           



                                 /s/ David I. Matson
                         -----------------------------------------------------
                              Name:  David I. Matson, as Regular Trustee


                                 /s/ David A. Anderson  
                         -----------------------------------------------------
                              Name:  David A. Anderson, as Regular Trustee


                                 /s/ John H. McGuckin, Jr.                   
                         -----------------------------------------------------
                              Name:  John H. McGuckin, Jr., as Regular Trustee




<PAGE>

                                                                     Exhibit 4.3


                                      CORRECTED
                                 CERTIFICATE OF TRUST
                                          OF
                             UNIONBANCAL FINANCE TRUST II


                     --------------------------------------------

                 Pursuant to Section 3810(e) of Title 12, Chapter 38 
                                of the Delaware Code 

                     --------------------------------------------

          The name of the business trust is UnionBanCal Finance Trust II (the
"Trust").

          The Trust filed a Certificate of Trust on November 17, 1998.

          The Trust filed a Corrected Certificate of Trust on November 20, 1998.
Each Certificate which was filed erroneously omitted the signatures of three of
the Trustees.

          The Corrected Certificate of Trust of the Trust is hereby corrected to
read in its entirety as follows:

                                 CERTIFICATE OF TRUST
                                          OF
                             UNIONBANCAL FINANCE TRUST II

          The undersigned, the trustees of UnionBanCal Finance Trust II,
desiring to form a business trust pursuant to Delaware Business Trust Act, 12
DEL. C. Section 3810 hereby certify as follows:

          1.   The name of the business trust being formed hereby is UnionBanCal
               Finance Trust II (the "Trust").

          2.   The name and business address of the trustee of the Trust with a
               principal place of business in the State of Delaware is as
               follows:

               First Chicago Delaware Inc.
               300 King Street
               Wilmington, DE  19801

<PAGE>

                         FIRST CHICAGO DELAWARE INC., as
                          Delaware Trustee

                         By:    /s/ Lawrence Dillard
                            ---------------------------------------------------
                              Name: Lawrence Dillard
                              Title: First Vice President



                         THE FIRST NATIONAL BANK OF CHICAGO, as
                          Property Trustee

                         By:     /s/ Lawrence Dillard
                            ---------------------------------------------------
                              Name: Lawrence Dillard
                              Title: First Vice President

                                 /s/ David I. Matson
                            ---------------------------------------------------
                              Name:  David I. Matson, as Regular Trustee

                                 /s/ David A. Anderson
                            ---------------------------------------------------
                              Name:  David A. Anderson, as Regular Trustee

                                /s/  John H. McGuckin, Jr.
                            ---------------------------------------------------
                              Name:  John H. McGuckin, Jr.,  as Regular Trustee




<PAGE>

                                                                     Exhibit 4.4


                                      CORRECTED
                                 CERTIFICATE OF TRUST
                                          OF
                            UNIONBANCAL FINANCE TRUST III


                     --------------------------------------------

                 Pursuant to Section 3810(e) of Title 12, Chapter 38 
                                of the Delaware Code 

                     --------------------------------------------

          The name of the business trust is UnionBanCal Finance Trust III (the
"Trust").

          The Trust filed a Certificate of Trust on November 17, 1998 which
erroneously omitted the signatures of three of the Trustees.

          The Certificate of Trust of the Trust is hereby corrected to read in
its entirety as follows:

                                CERTIFICATE OF TRUST
                                          OF
                            UNIONBANCAL FINANCE TRUST III


          The undersigned, the trustees of UnionBanCal Finance Trust III,
desiring to form a business trust pursuant to Delaware Business Trust Act, 12
DEL. C. Section 3810 hereby certify as follows:

          1.   The name of the business trust being formed hereby is UnionBanCal
               Finance Trust III (the "Trust").

          2.   The name and business address of the trustee of the Trust with a
               principal place of business in the State of Delaware is as
               follows:

               First Chicago Delaware Inc.
               300 King Street
               Wilmington, DE  19801

<PAGE>

                         FIRST CHICAGO DELAWARE INC., as
                          Delaware Trustee

                         By:    /s/ Lawrence Dillard
                            ---------------------------------------------------
                              Name: Lawrence Dillard
                              Title: First Vice President



                         THE FIRST NATIONAL BANK OF CHICAGO, as
                          Property Trustee

                         By:    /s/ Lawrence Dillard 
                            ---------------------------------------------------
                              Name: Lawrence Dillard
                              Title: First Vice President
                                           


                                /s/ David I. Matson 
                         ------------------------------------------------------
                              Name:  David I. Matson, as Regular Trustee


                                /s/ David A. Anderson 
                         ------------------------------------------------------
                              Name:  David A. Anderson, as Regular Trustee


                                /s/ John H. McGuckin, Jr.
                         ------------------------------------------------------
                              Name:  John H. McGuckin, Jr., as Regular Trustee



<PAGE>

                                                                     Exhibit 4.5


                                      CORRECTED
                                 CERTIFICATE OF TRUST
                                          OF
                             UNIONBANCAL FINANCE TRUST IV


                    ---------------------------------------------

                 Pursuant to Section 3810(e) of Title 12, Chapter 38 
                                of the Delaware Code 

                    ---------------------------------------------

          The name of the business trust is UnionBanCal Finance Trust IV (the
"Trust").

          The Trust filed a Certificate of Trust on November 17, 1998 which
erroneously omitted the signatures of three of the Trustees.

          The Certificate of Trust of the Trust is hereby corrected to read in
its entirety as follows:

                                CERTIFICATE OF TRUST
                                          OF
                             UNIONBANCAL FINANCE TRUST IV


          The undersigned, the trustees of UnionBanCal Finance Trust IV,
desiring to form a business trust pursuant to Delaware Business Trust Act, 12
DEL. C. Section 3810 hereby certify as follows:

          1.   The name of the business trust being formed hereby is UnionBanCal
               Finance Trust IV (the "Trust").

          2.   The name and business address of the trustee of the Trust with a
               principal place of business in the State of Delaware is as
               follows:

               First Chicago Delaware Inc.
               300 King Street
               Wilmington, DE  19801

<PAGE>


                         FIRST CHICAGO DELAWARE INC., as
                          Delaware Trustee

                         By:    /s/ Lawrence Dillard                      
                            ---------------------------------------------------
                              Name: Lawrence Dillard
                              Title: First Vice President



                         THE FIRST NATIONAL BANK OF CHICAGO, as
                          Property Trustee

                         By:    /s/ Lawrence Dillard                  
                            ---------------------------------------------------
                              Name: Lawrence Dillard
                              Title: First Vice President



                                /s/ David I. Matson 
                         ------------------------------------------------------
                              Name:  David I. Matson, as Regular Trustee


                                /s/ David A. Anderson 
                         ------------------------------------------------------
                              Name:  David A. Anderson, as Regular Trustee


                                /s/ John H. McGuckin, Jr.  
                         ------------------------------------------------------
                              Name:  John H. McGuckin, Jr., as Regular Trustee




<PAGE>

                                                                     Exhibit 4.6

                                 DECLARATION OF TRUST

                                         OF

                             UNIONBANCAL FINANCE TRUST I


     DECLARATION OF TRUST, dated as of November 17, 1998, among UnionBanCal
Corporation, a California corporation, as "Sponsor," and David I. Matson, David
A. Anderson and John H. McGuckin, as "Regular Trustees," First Chicago Delaware
Inc., a Delaware banking corporation, as "Delaware Trustee,"  and The First
National Bank of Chicago, a national banking association, as "Property Trustee,"
not in their individual capacities but solely as trustees (the Regular Trustees,
the Delaware Trustee and the Property Trustee collectively, the "Trustees").
The Sponsor and the Trustees hereby agree as follows:

     1.   The trust created hereby shall be known as "UnionBanCal Finance Trust
I" (the "Trust") in which name the Trustees, or the Sponsor to the extent
provided herein, may conduct the business of the Trust, make and execute
contracts, and sue and be sued.

     2.   The Sponsor hereby assigns, transfers, conveys and sets over to the
Trustees the sum of $10.  The Trustees hereby acknowledge receipt of such amount
in trust from the Sponsor, which amount shall constitute the initial trust
estate.  The Trustees hereby declare that they will hold the trust estate in
trust for the Sponsor.  It is the intention of the parties hereto that the Trust
created hereby constitutes a business trust under Chapter 38 of Title 12 of the
Delaware Code, 12 DEL. C. Section  3801 ET SEQ. (the "Business Trust Act"), and
that this document constitutes the governing instrument of the Trust.  The
Trustees are hereby authorized and directed to execute and file a certificate of
trust with the Delaware Secretary of State in accordance with the Business Trust
Act.

     3.   The Sponsor and the Trustees will enter into an Amended and Restated
Declaration of Trust, satisfactory to each such party and substantially in the
form included as an exhibit to the 1933 Act Registration Statement referred to
below, to provide for the contemplated operation of the Trust created hereby and
the issuance of the preferred securities and common securities referred to
therein.  Prior to the execution and delivery of such Amended and Restated
Declaration of Trust, the Trustees shall not have any duty or obligation
hereunder or with respect to the trust estate, except as otherwise required by
applicable law or as may be necessary to obtain prior to such execution and
delivery any licenses, consents or approvals required by applicable law or
otherwise.

<PAGE>

     4.   The Sponsor and the Trustees hereby authorize and direct the Sponsor,
as the sponsor of the Trust, (i) to file with the Securities and Exchange
Commission (the "Commission") and execute, in each case on behalf of the Trust,
(a) a Registration Statement on Form S-3 (the "1933 Act Registration
Statement"), including any pre-effective or post-effective amendments to such
Registration Statement, relating to the registration under the Securities Act of
1933, as amended, of the preferred securities of the Trust (the "Preferred
Securities") and (b) a Registration Statement on Form 8-A or other appropriate
form (the "1934 Act Registration Statement"), including any pre-effective or
post-effective amendments to such Registration Statement, relating to the
registration of the Preferred Securities under Section 12(b) or Section 12(g) of
the Securities Exchange Act of 1934, as amended; (ii) to file with The New York
Stock Exchange, Inc. ("NYSE") or any other national stock exchange for listing,
or quotation on an interdealer quotation system, and execute on behalf of the
Trust, a listing application and all other applications, statements,
certificates, agreements and other instruments as shall be necessary or
desirable to cause the Preferred Securities to be listed on the NYSE or any
other national stock exchange or quoted on an interdealer quotation system;
(iii) to file and execute on behalf of the Trust such applications, reports,
surety bonds, irrevocable consents, appointments of attorney for service of
process and other papers and documents as shall be necessary or desirable to
register the Preferred Securities under the securities or "Blue Sky" laws of
such jurisdictions as the Sponsor, on behalf of the Trust, may deem necessary or
desirable; (iv) to prepare and execute letters or documents to, or instruments
with, The Depository Trust Company relating to the Preferred Securities; (v) to
execute on behalf of the Trust an underwriting agreement among the Trust, the
Sponsor and any underwriter, dealer or agent relating to the Preferred
Securities and (vi) to incur expenses, execute documents and take any other
actions as shall be necessary or desirable in offering the Preferred Securities.
In the event that any filing referred to in clauses (i)-(iii) above is required
by the rules and regulations of the Commission, the NYSE, any other national
stock exchange or interdealer quotation system or state securities or Blue Sky
laws, to be executed on behalf of the Trust by one or more of the Trustees,
David I. Matson, David A. Anderson and John H. McGuckin in their capacities as
Regular Trustees of the Trust, are each hereby authorized and directed to join
in any such filing and to execute on behalf of the Trust any and all of the
foregoing, it being understood that First Chicago Delaware Inc. and The First
National Bank of Chicago, in their capacities as Trustees of the Trust, shall
not be required to join in any such filing or execute on behalf of the Trust any
such document unless required by the rules and regulations of the Commission,
the NYSE or state securities or blue sky laws.  In connection with all of the
foregoing, the Sponsor and each Trustee, solely in his or its, as the case may
be, capacity as a Trustee of the Trust, hereby constitute and appoint David I.
Matson, David A. Anderson and John H. McGuckin, and each of them, as his or its,
as the case may be, true and lawful attorneys-in-fact, and agents, with full
power of substitution and resubstitution, for the Sponsor or such Trustee or in
the Sponsor's or such Trustee's name, place and stead, in any and all
capacities, to sign any and all amendments (including post-effective amendments)
to the 1933 Act Registration Statement, the 1934 Act Registration Statement and
to file the same, with all exhibits thereto, and other documents in connection
therewith, with the


                                          2
<PAGE>

Commission, granting unto said attorneys-in-fact and agents full power and
authority to do and perform each and every act and thing requisite and necessary
to be done in connection therewith, as fully to all intents and purposes as the
Sponsor or such Trustee might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents or any of them, or their
or his substitute or substitutes, shall do or cause to be done by virtue hereof.

     5.   This Declaration of Trust may be executed in one or more counterparts.

     6.   The number of Trustees initially shall be five (5) and thereafter the
number of Trustees shall be such number as shall be fixed from time to time by a
written instrument signed by the Sponsor which may increase or decrease the
number of Trustees; provided, however, that the number of Trustees shall in no
event be less than five (5); and provided, further that to the extent required
by the Business Trust Act, one Trustee shall either be a natural person who is a
resident of the State of Delaware or, if not a natural person, an entity which
has as its principal place of business in the State of Delaware.  Subject to the
foregoing, the Sponsor is entitled to appoint or remove without cause any
Trustee at any time, upon written notice delivered to the Trustee.  Any of the
Trustees may resign upon thirty days prior notice to the Sponsor.

     7.   The Trust may terminate without issuing any securities at the election
of the Sponsor.

     8.   This Declaration shall be governed by, and construed in accordance
with, the laws of the State of Delaware (without regard to conflict of laws of
principles).

                                          3
<PAGE>

     IN WITNESS WHEREOF,  the parties hereto have caused this Declaration of
Trust to be duly executed as of the day and year first above written.


UnionBanCal Corporation, as Sponsor        First Chicago Delaware, Inc.,
                                           not in its individual capacity but
                                           solely as Delaware Trustee


By:   /s/ John H. McGuckin, Jr.            By:   /s/ Lawrence Dillard
    ---------------------------------          ---------------------------------
     Name:  John H. McGuckin, Jr.               Name:  Lawrence Dillard
     Title: Executive Vice President            Title: First Vice President
            and General Counsel

The First National Bank of Chicago,
not in its individual capacity but
solely as Property Trustee



By:   /s/ Lawrence Dillard                  /s/ David I.  Matson
    ---------------------------------      -------------------------------------
     Name:  Lawrence Dillard                    Name: David I. Matson, not in
     Title: First Vice President                      his individual capacity
                                                      but solely as Regular
                                                      Trustee



 /s/ David A. Anderson                      /s/ John H. McGuckin
- -------------------------------------      -------------------------------------
     Name:  David A. Anderson, not in           Name: John H. McGuckin, not in
            his individual capacity                   his individual capacity
            but solely as Regular                     but solely as Regular
            Trustee                                   Trustee



<PAGE>

                                                                     Exhibit 4.7


                                 DECLARATION OF TRUST

                                         OF

                             UNIONBANCAL FINANCE TRUST II


     DECLARATION OF TRUST, dated as of November 17, 1998, among UnionBanCal
Corporation, a California corporation, as "Sponsor," and David I. Matson, David
A. Anderson and John H. McGuckin, as "Regular Trustees," First Chicago Delaware
Inc., a Delaware banking corporation, as "Delaware Trustee,"  and The First
National Bank of Chicago, a national banking association, as "Property Trustee,"
not in their individual capacities but solely as trustees (the Regular Trustees,
the Delaware Trustee and the Property Trustee collectively, the "Trustees").
The Sponsor and the Trustees hereby agree as follows:

     1.   The trust created hereby shall be known as "UnionBanCal Finance Trust
II" (the "Trust") in which name the Trustees, or the Sponsor to the extent
provided herein, may conduct the business of the Trust, make and execute
contracts, and sue and be sued.

     2.   The Sponsor hereby assigns, transfers, conveys and sets over to the
Trustees the sum of $10.  The Trustees hereby acknowledge receipt of such amount
in trust from the Sponsor, which amount shall constitute the initial trust
estate.  The Trustees hereby declare that they will hold the trust estate in
trust for the Sponsor.  It is the intention of the parties hereto that the Trust
created hereby constitutes a business trust under Chapter 38 of Title 12 of the
Delaware Code, 12 DEL. C. Section  3801 ET SEQ. (the "Business Trust Act"), and
that this document constitutes the governing instrument of the Trust.  The
Trustees are hereby authorized and directed to execute and file a certificate of
trust with the Delaware Secretary of State in accordance with the Business Trust
Act.

     3.   The Sponsor and the Trustees will enter into an Amended and Restated
Declaration of Trust, satisfactory to each such party and substantially in the
form included as an exhibit to the 1933 Act Registration Statement referred to
below, to provide for the contemplated operation of the Trust created hereby and
the issuance of the preferred securities and common securities referred to
therein.  Prior to the execution and delivery of such Amended and Restated
Declaration of Trust, the Trustees shall not have any duty or obligation
hereunder or with respect to the trust estate, except as otherwise required by
applicable law or as may be necessary to obtain prior to such execution and
delivery any licenses, consents or approvals required by applicable law or
otherwise.

<PAGE>

     4.   The Sponsor and the Trustees hereby authorize and direct the Sponsor,
as the sponsor of the Trust, (i) to file with the Securities and Exchange
Commission (the "Commission") and execute, in each case on behalf of the Trust,
(a) a Registration Statement on Form S-3 (the "1933 Act Registration
Statement"), including any pre-effective or post-effective amendments to such
Registration Statement, relating to the registration under the Securities Act of
1933, as amended, of the preferred securities of the Trust (the "Preferred
Securities") and (b) a Registration Statement on Form 8-A or other appropriate
form (the "1934 Act Registration Statement"), including any pre-effective or
post-effective amendments to such Registration Statement, relating to the
registration of the Preferred Securities under Section 12(b) or Section 12(g) of
the Securities Exchange Act of 1934, as amended; (ii) to file with The New York
Stock Exchange, Inc. ("NYSE") or any other national stock exchange for listing,
or quotation on an interdealer quotation system, and execute on behalf of the
Trust, a listing application and all other applications, statements,
certificates, agreements and other instruments as shall be necessary or
desirable to cause the Preferred Securities to be listed on the NYSE or any
other national stock exchange or quoted on an interdealer quotation system;
(iii) to file and execute on behalf of the Trust such applications, reports,
surety bonds, irrevocable consents, appointments of attorney for service of
process and other papers and documents as shall be necessary or desirable to
register the Preferred Securities under the securities or "Blue Sky" laws of
such jurisdictions as the Sponsor, on behalf of the Trust, may deem necessary or
desirable; (iv) to prepare and execute letters or documents to, or instruments
with, The Depository Trust Company relating to the Preferred Securities; (v) to
execute on behalf of the Trust an underwriting agreement among the Trust, the
Sponsor and any underwriter, dealer or agent relating to the Preferred
Securities and (vi) to incur expenses, execute documents and take any other
actions as shall be necessary or desirable in offering the Preferred Securities.
In the event that any filing referred to in clauses (i)-(iii) above is required
by the rules and regulations of the Commission, the NYSE, any other national
stock exchange or interdealer quotation system or state securities or Blue Sky
laws, to be executed on behalf of the Trust by one or more of the Trustees,
David I. Matson, David A. Anderson and John H. McGuckin in their capacities as
Regular Trustees of the Trust, are each hereby authorized and directed to join
in any such filing and to execute on behalf of the Trust any and all of the
foregoing, it being understood that First Chicago Delaware Inc. and The First
National Bank of Chicago, in their capacities as Trustees of the Trust, shall
not be required to join in any such filing or execute on behalf of the Trust any
such document unless required by the rules and regulations of the Commission,
the NYSE or state securities or blue sky laws.  In connection with all of the
foregoing, the Sponsor and each Trustee, solely in his or its, as the case may
be, capacity as a Trustee of the Trust, hereby constitute and appoint David I.
Matson, David A. Anderson and John H. McGuckin, and each of them, as his or its,
as the case may be, true and lawful attorneys-in-fact, and agents, with full
power of substitution and resubstitution, for the Sponsor or such Trustee or in
the Sponsor's or such Trustee's name, place and stead, in any and all
capacities, to sign any and all amendments (including post-effective amendments)
to the 1933 Act Registration Statement, the 1934 Act Registration Statement and
to file the same, with all exhibits thereto, and other documents in connection
therewith, with the


                                          2
<PAGE>

Commission, granting unto said attorneys-in-fact and agents full power and
authority to do and perform each and every act and thing requisite and necessary
to be done in connection therewith, as fully to all intents and purposes as the
Sponsor or such Trustee might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents or any of them, or their
or his substitute or substitutes, shall do or cause to be done by virtue hereof.

     5.   This Declaration of Trust may be executed in one or more counterparts.

     6.   The number of Trustees initially shall be five (5) and thereafter the
number of Trustees shall be such number as shall be fixed from time to time by a
written instrument signed by the Sponsor which may increase or decrease the
number of Trustees; provided, however, that the number of Trustees shall in no
event be less than five (5); and provided, further that to the extent required
by the Business Trust Act, one Trustee shall either be a natural person who is a
resident of the State of Delaware or, if not a natural person, an entity which
has as its principal place of business in the State of Delaware.  Subject to the
foregoing, the Sponsor is entitled to appoint or remove without cause any
Trustee at any time, upon written notice delivered to the Trustee.  Any of the
Trustees may resign upon thirty days prior notice to the Sponsor.

     7.   The Trust may terminate without issuing any securities at the election
of the Sponsor.

     8.   This Declaration shall be governed by, and construed in accordance
with, the laws of the State of Delaware (without regard to conflict of laws of
principles).

                                          3
<PAGE>


     IN WITNESS WHEREOF,  the parties hereto have caused this Declaration of
Trust to be duly executed as of the day and year first above written.


UnionBanCal Corporation, as Sponsor        First Chicago Delaware, Inc.,
                                           not in its individual capacity but
                                           solely as Delaware Trustee


By:   /s/ John H. McGuckin, Jr.            By:   /s/ Lawrence Dillard
    ---------------------------------          ---------------------------------
     Name:  John H. McGuckin, Jr.               Name:  Lawrence Dillard
     Title: Executive Vice President            Title: First Vice President
            and General Counsel

The First National Bank of Chicago,
not in its individual capacity but
solely as Property Trustee



By:   /s/ Lawrence Dillard                  /s/ David I.  Matson
    ---------------------------------      -------------------------------------
     Name:  Lawrence Dillard                    Name: David I. Matson, not in
     Title: First Vice President                      his individual capacity
                                                      but solely as Regular
                                                      Trustee



 /s/ David A. Anderson                      /s/ John H. McGuckin
- -------------------------------------      -------------------------------------
     Name:  David A. Anderson, not in           Name: John H. McGuckin, not in
            his individual capacity                   his individual capacity
            but solely as Regular                     but solely as Regular
            Trustee                                   Trustee



<PAGE>

                                                                     Exhibit 4.8
       
                                 DECLARATION OF TRUST

                                         OF

                            UNIONBANCAL FINANCE TRUST III


     DECLARATION OF TRUST, dated as of November 17, 1998, among UnionBanCal
Corporation, a California corporation, as "Sponsor," and David I. Matson, David
A. Anderson and John H. McGuckin, as "Regular Trustees," First Chicago Delaware
Inc., a Delaware banking corporation, as "Delaware Trustee,"  and The First
National Bank of Chicago, a national banking association, as "Property Trustee,"
not in their individual capacities but solely as trustees (the Regular Trustees,
the Delaware Trustee and the Property Trustee collectively, the "Trustees").
The Sponsor and the Trustees hereby agree as follows:

     1.   The trust created hereby shall be known as "UnionBanCal Finance Trust
III" (the "Trust") in which name the Trustees, or the Sponsor to the extent
provided herein, may conduct the business of the Trust, make and execute
contracts, and sue and be sued.

     2.   The Sponsor hereby assigns, transfers, conveys and sets over to the
Trustees the sum of $10.  The Trustees hereby acknowledge receipt of such amount
in trust from the Sponsor, which amount shall constitute the initial trust
estate.  The Trustees hereby declare that they will hold the trust estate in
trust for the Sponsor.  It is the intention of the parties hereto that the Trust
created hereby constitutes a business trust under Chapter 38 of Title 12 of the
Delaware Code, 12 DEL. C. Section  3801 ET SEQ. (the "Business Trust Act"), and
that this document constitutes the governing instrument of the Trust.  The
Trustees are hereby authorized and directed to execute and file a certificate of
trust with the Delaware Secretary of State in accordance with the Business Trust
Act.

     3.   The Sponsor and the Trustees will enter into an Amended and Restated
Declaration of Trust, satisfactory to each such party and substantially in the
form included as an exhibit to the 1933 Act Registration Statement referred to
below, to provide for the contemplated operation of the Trust created hereby and
the issuance of the preferred securities and common securities referred to
therein.  Prior to the execution and delivery of such Amended and Restated
Declaration of Trust, the Trustees shall not have any duty or obligation
hereunder or with respect to the trust estate, except as otherwise required by
applicable law or as may be necessary to obtain prior to such execution and
delivery any licenses, consents or approvals required by applicable law or
otherwise.

<PAGE>

     4.   The Sponsor and the Trustees hereby authorize and direct the Sponsor,
as the sponsor of the Trust, (i) to file with the Securities and Exchange
Commission (the "Commission") and execute, in each case on behalf of the Trust,
(a) a Registration Statement on Form S-3 (the "1933 Act Registration
Statement"), including any pre-effective or post-effective amendments to such
Registration Statement, relating to the registration under the Securities Act of
1933, as amended, of the preferred securities of the Trust (the "Preferred
Securities") and (b) a Registration Statement on Form 8-A or other appropriate
form (the "1934 Act Registration Statement"), including any pre-effective or
post-effective amendments to such Registration Statement, relating to the
registration of the Preferred Securities under Section 12(b) or Section 12(g) of
the Securities Exchange Act of 1934, as amended; (ii) to file with The New York
Stock Exchange, Inc. ("NYSE") or any other national stock exchange for listing,
or quotation on an interdealer quotation system, and execute on behalf of the
Trust, a listing application and all other applications, statements,
certificates, agreements and other instruments as shall be necessary or
desirable to cause the Preferred Securities to be listed on the NYSE or any
other national stock exchange or quoted on an interdealer quotation system;
(iii) to file and execute on behalf of the Trust such applications, reports,
surety bonds, irrevocable consents, appointments of attorney for service of
process and other papers and documents as shall be necessary or desirable to
register the Preferred Securities under the securities or "Blue Sky" laws of
such jurisdictions as the Sponsor, on behalf of the Trust, may deem necessary or
desirable; (iv) to prepare and execute letters or documents to, or instruments
with, The Depository Trust Company relating to the Preferred Securities; (v) to
execute on behalf of the Trust an underwriting agreement among the Trust, the
Sponsor and any underwriter, dealer or agent relating to the Preferred
Securities and (vi) to incur expenses, execute documents and take any other
actions as shall be necessary or desirable in offering the Preferred Securities.
In the event that any filing referred to in clauses (i)-(iii) above is required
by the rules and regulations of the Commission, the NYSE, any other national
stock exchange or interdealer quotation system or state securities or Blue Sky
laws, to be executed on behalf of the Trust by one or more of the Trustees,
David I. Matson, David A. Anderson and John H. McGuckin in their capacities as
Regular Trustees of the Trust, are each hereby authorized and directed to join
in any such filing and to execute on behalf of the Trust any and all of the
foregoing, it being understood that First Chicago Delaware Inc. and The First
National Bank of Chicago, in their capacities as Trustees of the Trust, shall
not be required to join in any such filing or execute on behalf of the Trust any
such document unless required by the rules and regulations of the Commission,
the NYSE or state securities or blue sky laws.  In connection with all of the
foregoing, the Sponsor and each Trustee, solely in his or its, as the case may
be, capacity as a Trustee of the Trust, hereby constitute and appoint David I.
Matson, David A. Anderson and John H. McGuckin, and each of them, as his or its,
as the case may be, true and lawful attorneys-in-fact, and agents, with full
power of substitution and resubstitution, for the Sponsor or such Trustee or in
the Sponsor's or such Trustee's name, place and stead, in any and all
capacities, to sign any and all amendments (including post-effective amendments)
to the 1933 Act Registration Statement, the 1934 Act Registration Statement and
to file the same, with all exhibits thereto, and other documents in connection
therewith, with the


                                          2
<PAGE>

Commission, granting unto said attorneys-in-fact and agents full power and
authority to do and perform each and every act and thing requisite and necessary
to be done in connection therewith, as fully to all intents and purposes as the
Sponsor or such Trustee might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents or any of them, or their
or his substitute or substitutes, shall do or cause to be done by virtue hereof.

     5.   This Declaration of Trust may be executed in one or more counterparts.

     6.   The number of Trustees initially shall be five (5) and thereafter the
number of Trustees shall be such number as shall be fixed from time to time by a
written instrument signed by the Sponsor which may increase or decrease the
number of Trustees; provided, however, that the number of Trustees shall in no
event be less than five (5); and provided, further that to the extent required
by the Business Trust Act, one Trustee shall either be a natural person who is a
resident of the State of Delaware or, if not a natural person, an entity which
has as its principal place of business in the State of Delaware.  Subject to the
foregoing, the Sponsor is entitled to appoint or remove without cause any
Trustee at any time, upon written notice delivered to the Trustee.  Any of the
Trustees may resign upon thirty days prior notice to the Sponsor.

     7.   The Trust may terminate without issuing any securities at the election
of the Sponsor.

     8.   This Declaration shall be governed by, and construed in accordance
with, the laws of the State of Delaware (without regard to conflict of laws of
principles).


                                          3
<PAGE>

     IN WITNESS WHEREOF,  the parties hereto have caused this Declaration of
Trust to be duly executed as of the day and year first above written.


UnionBanCal Corporation, as Sponsor        First Chicago Delaware, Inc.,
                                           not in its individual capacity but
                                           solely as Delaware Trustee


By:   /s/ John H. McGuckin, Jr.            By:   /s/ Lawrence Dillard
    ---------------------------------          ---------------------------------
     Name:  John H. McGuckin, Jr.               Name:  Lawrence Dillard
     Title: Executive Vice President            Title: First Vice President
            and General Counsel

The First National Bank of Chicago,
not in its individual capacity but
solely as Property Trustee



By:   /s/ Lawrence Dillard                  /s/ David I.  Matson
    ---------------------------------      -------------------------------------
     Name:  Lawrence Dillard                    Name: David I. Matson, not in
     Title: First Vice President                      his individual capacity
                                                      but solely as Regular
                                                      Trustee



 /s/ David A. Anderson                      /s/ John H. McGuckin
- -------------------------------------      -------------------------------------
     Name:  David A. Anderson, not in           Name: John H. McGuckin, not in
            his individual capacity                   his individual capacity
            but solely as Regular                     but solely as Regular
            Trustee                                   Trustee



<PAGE>

                                                                     Exhibit 4.9

                                 DECLARATION OF TRUST

                                         OF

                             UNIONBANCAL FINANCE TRUST IV


     DECLARATION OF TRUST, dated as of November 17, 1998, among UnionBanCal
Corporation, a California corporation, as "Sponsor," and David I. Matson, David
A. Anderson and John H. McGuckin, as "Regular Trustees," First Chicago Delaware
Inc., a Delaware banking corporation, as "Delaware Trustee,"  and The First
National Bank of Chicago, a national banking association, as "Property Trustee,"
not in their individual capacities but solely as trustees (the Regular Trustees,
the Delaware Trustee and the Property Trustee collectively, the "Trustees").
The Sponsor and the Trustees hereby agree as follows:

     1.   The trust created hereby shall be known as "UnionBanCal Finance Trust
IV" (the "Trust") in which name the Trustees, or the Sponsor to the extent
provided herein, may conduct the business of the Trust, make and execute
contracts, and sue and be sued.

     2.   The Sponsor hereby assigns, transfers, conveys and sets over to the
Trustees the sum of $10.  The Trustees hereby acknowledge receipt of such amount
in trust from the Sponsor, which amount shall constitute the initial trust
estate.  The Trustees hereby declare that they will hold the trust estate in
trust for the Sponsor.  It is the intention of the parties hereto that the Trust
created hereby constitutes a business trust under Chapter 38 of Title 12 of the
Delaware Code, 12 DEL. C. Section  3801 ET SEQ. (the "Business Trust Act"), and
that this document constitutes the governing instrument of the Trust.  The
Trustees are hereby authorized and directed to execute and file a certificate of
trust with the Delaware Secretary of State in accordance with the Business Trust
Act.

     3.   The Sponsor and the Trustees will enter into an Amended and Restated
Declaration of Trust, satisfactory to each such party and substantially in the
form included as an exhibit to the 1933 Act Registration Statement referred to
below, to provide for the contemplated operation of the Trust created hereby and
the issuance of the preferred securities and common securities referred to
therein.  Prior to the execution and delivery of such Amended and Restated
Declaration of Trust, the Trustees shall not have any duty or obligation
hereunder or with respect to the trust estate, except as otherwise required by
applicable law or as may be necessary to obtain prior to such execution and
delivery any licenses, consents or approvals required by applicable law or
otherwise.


<PAGE>

     4.   The Sponsor and the Trustees hereby authorize and direct the Sponsor,
as the sponsor of the Trust, (i) to file with the Securities and Exchange
Commission (the "Commission") and execute, in each case on behalf of the Trust,
(a) a Registration Statement on Form S-3 (the "1933 Act Registration
Statement"), including any pre-effective or post-effective amendments to such
Registration Statement, relating to the registration under the Securities Act of
1933, as amended, of the preferred securities of the Trust (the "Preferred
Securities") and (b) a Registration Statement on Form 8-A or other appropriate
form (the "1934 Act Registration Statement"), including any pre-effective or
post-effective amendments to such Registration Statement, relating to the
registration of the Preferred Securities under Section 12(b) or Section 12(g) of
the Securities Exchange Act of 1934, as amended; (ii) to file with The New York
Stock Exchange, Inc. ("NYSE") or any other national stock exchange for listing,
or quotation on an interdealer quotation system, and execute on behalf of the
Trust, a listing application and all other applications, statements,
certificates, agreements and other instruments as shall be necessary or
desirable to cause the Preferred Securities to be listed on the NYSE or any
other national stock exchange or quoted on an interdealer quotation system;
(iii) to file and execute on behalf of the Trust such applications, reports,
surety bonds, irrevocable consents, appointments of attorney for service of
process and other papers and documents as shall be necessary or desirable to
register the Preferred Securities under the securities or "Blue Sky" laws of
such jurisdictions as the Sponsor, on behalf of the Trust, may deem necessary or
desirable; (iv) to prepare and execute letters or documents to, or instruments
with, The Depository Trust Company relating to the Preferred Securities; (v) to
execute on behalf of the Trust an underwriting agreement among the Trust, the
Sponsor and any underwriter, dealer or agent relating to the Preferred
Securities and (vi) to incur expenses, execute documents and take any other
actions as shall be necessary or desirable in offering the Preferred Securities.
In the event that any filing referred to in clauses (i)-(iii) above is required
by the rules and regulations of the Commission, the NYSE, any other national
stock exchange or interdealer quotation system or state securities or Blue Sky
laws, to be executed on behalf of the Trust by one or more of the Trustees,
David I. Matson, David A. Anderson and John H. McGuckin in their capacities as
Regular Trustees of the Trust, are each hereby authorized and directed to join
in any such filing and to execute on behalf of the Trust any and all of the
foregoing, it being understood that First Chicago Delaware Inc. and The First
National Bank of Chicago, in their capacities as Trustees of the Trust, shall
not be required to join in any such filing or execute on behalf of the Trust any
such document unless required by the rules and regulations of the Commission,
the NYSE or state securities or blue sky laws.  In connection with all of the
foregoing, the Sponsor and each Trustee, solely in his or its, as the case may
be, capacity as a Trustee of the Trust, hereby constitute and appoint David I.
Matson, David A. Anderson and John H. McGuckin, and each of them, as his or its,
as the case may be, true and lawful attorneys-in-fact, and agents, with full
power of substitution and resubstitution, for the Sponsor or such Trustee or in
the Sponsor's or such Trustee's name, place and stead, in any and all
capacities, to sign any and all amendments (including post-effective amendments)
to the 1933 Act Registration Statement, the 1934 Act Registration Statement and
to file the same, with all exhibits thereto, and other documents in connection
therewith, with the


                                          2
<PAGE>

Commission, granting unto said attorneys-in-fact and agents full power and
authority to do and perform each and every act and thing requisite and necessary
to be done in connection therewith, as fully to all intents and purposes as the
Sponsor or such Trustee might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents or any of them, or their
or his substitute or substitutes, shall do or cause to be done by virtue hereof.

     5.   This Declaration of Trust may be executed in one or more counterparts.

     6.   The number of Trustees initially shall be five (5) and thereafter the
number of Trustees shall be such number as shall be fixed from time to time by a
written instrument signed by the Sponsor which may increase or decrease the
number of Trustees; provided, however, that the number of Trustees shall in no
event be less than five (5); and provided, further that to the extent required
by the Business Trust Act, one Trustee shall either be a natural person who is a
resident of the State of Delaware or, if not a natural person, an entity which
has as its principal place of business in the State of Delaware.  Subject to the
foregoing, the Sponsor is entitled to appoint or remove without cause any
Trustee at any time, upon written notice delivered to the Trustee.  Any of the
Trustees may resign upon thirty days prior notice to the Sponsor.

     7.   The Trust may terminate without issuing any securities at the election
of the Sponsor.

     8.   This Declaration shall be governed by, and construed in accordance
with, the laws of the State of Delaware (without regard to conflict of laws of
principles).


                                          3
<PAGE>

     IN WITNESS WHEREOF,  the parties hereto have caused this Declaration of
Trust to be duly executed as of the day and year first above written.


UnionBanCal Corporation, as Sponsor        First Chicago Delaware, Inc.,
                                           not in its individual capacity but
                                           solely as Delaware Trustee


By:   /s/ John H. McGuckin, Jr.            By:   /s/ Lawrence Dillard
    ---------------------------------          ---------------------------------
     Name:  John H. McGuckin, Jr.               Name:  Lawrence Dillard
     Title: Executive Vice President            Title: First Vice President
            and General Counsel

The First National Bank of Chicago,
not in its individual capacity but
solely as Property Trustee



By:   /s/ Lawrence Dillard                  /s/ David I.  Matson
    ---------------------------------      -------------------------------------
     Name:  Lawrence Dillard                    Name: David I. Matson, not in
     Title: First Vice President                      his individual capacity
                                                      but solely as Regular
                                                      Trustee



 /s/ David A. Anderson                      /s/ John H. McGuckin
- -------------------------------------      -------------------------------------
     Name:  David A. Anderson, not in           Name: John H. McGuckin, not in
            his individual capacity                   his individual capacity
            but solely as Regular                     but solely as Regular
            Trustee                                   Trustee



<PAGE>
                                                                    EXHIBIT 23.1
 
INDEPENDENT AUDITORS' CONSENT
 
   
We consent to the incorporation by reference in Amendment No. 1 to Registration
Statement Nos. 333-67581, 333-67581-01, 333-67581-02, 333-67581-03, and
333-67581-04 of UnionBanCal Corporation of our report dated January 30, 1998
(November 18, 1998 as to the exchange of common stock referred to in Note 1,
paragraphs 3 and 4, and the adoption of SFAS No. 130, "Reporting Comprehensive
Income," referred to in Notes 1 and 18, and December 7, 1998 as to the stock
split referred to in Note 1, paragraph 5) appearing in Form 8-K of UnionBanCal
Corporation to be dated January 8, 1999, and to the reference to us under the
heading "Experts" in the Prospectus, which is a part of these Registration
Statements.
    
 
   
DELOITTE & TOUCHE LLP
San Francisco, California
January 7, 1999
    

<PAGE>
                                                                    EXHIBIT 23.2
 
                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
   
As independent public accountants, we hereby consent to the incorporation by
reference of our report dated January 24, 1996 on the consolidated financial
statements of Union Bank and subsidiaries for the year ended December 31, 1995
(not presented herein), included in Form 8-K of UnionBanCal Corporation and
subsidiaries, in Amendment No. 1 to Form S-3 Registration Statements File Nos.
333-67581, 333-67581-01, 333-67581-02, 333-67581-03 and 333-67581-04. It should
be noted that we have not audited any financial statements of Union Bank and
subsidiaries subsequent to December 31, 1995 or performed any audit procedures
subsequent to the date of our report.
    
 
   
                                          ARTHUR ANDERSEN LLP
    
 
   
San Francisco, California
January 7, 1999
    


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