BOK FINANCIAL CORP ET AL
S-3, 1999-07-02
NATIONAL COMMERCIAL BANKS
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<PAGE>   1
      As filed with the Securities and Exchange Commission on July 2, 1999
                                                          Registration No. 333-
- -------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

                                    FORM S-3
            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

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

                           BOK FINANCIAL CORPORATION
             (Exact name of Registrant as specified in its charter)

<TABLE>
<S>                               <C>                             <C>
          OKLAHOMA                           6021                      73-1373454
   (State or jurisdiction of      (Primary Standard Industrial     (I.R.S. Employer
 incorporation or organization)    Classification Code Number)    Identification No.)
</TABLE>

                             BANK OF OKLAHOMA TOWER
                         BOSTON AVENUE AT SECOND STREET
                             TULSA, OKLAHOMA 74172
                                 (918) 588-6000
  (Address, including zip code, and telephone number, including area code, of
                   Registrant's principal executive offices)

                                 JAMES A. WHITE
              EXECUTIVE VICE PRESIDENT AND CHIEF FINANCIAL OFFICER
                           BOK FINANCIAL CORPORATION
                             BANK OF OKLAHOMA TOWER
                         BOSTON AVENUE AT SECOND STREET
                             TULSA, OKLAHOMA 74172
                                 (918) 588-6416
           (Name, address, including zip code, and telephone number,
                  including area code, of agent for service)

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

                                   Copies to:

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

                           FREDERIC DORWART, LAWYERS
                               TAMARA R. WAGMAN
                                 OLD CITY HALL
                             124 EAST FOURTH STREET
                             TULSA, OKLAHOMA 74103
                                 (918) 583-9922

    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after this Registration Statement becomes effective.

    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 of
1933, other than securities offered only in connection with dividend or
interest reinvestment plans, check the following box. [X]

                        CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
                                                  PROPOSED         PROPOSED
                                                  MAXIMUM          MAXIMUM
     TITLE OF EACH CLASS OF       AMOUNT TO       OFFERING PRICE   AGGREGATE           AMOUNT OF
  SECURITIES TO BE REGISTERED     BE REGISTERED   PER SHARE        OFFERING PRICE    REGISTRATION FEE(1)
- -----------------------------     -------------   ---------        --------------    -------------------

<S>                               <C>             <C>              <C>               <C>
COMMON STOCK.................     2,371,809       $ 25.25          $59,888,178.00    $ 16,649.00
</TABLE>

(1) CALCULATED PURSUANT TO RULE 457(c) OF THE RULES AND REGULATIONS UNDER THE
    SECURITIES ACT OF 1933.

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

        THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH
         DATE OR DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE
           UNTIL THE REGISTRANT 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 OF 1933 OR UNTIL THE REGISTRATION
       STATEMENT SHALL BECOME EFFECTIVE ON SUCH DATE AS THE COMMISSION,
             ACTING PURSUANT TO SAID SECTION 8(a), MAY DETERMINE.


<PAGE>   2



PROSPECTUS

                                2,371,809 SHARES

                           BOK FINANCIAL CORPORATION

                                  COMMON STOCK

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

The shareholders named in this prospectus may offer from time to time shares of
common stock of BOK Financial Corporation. The common stock will be offered in
accordance with the Plan of Distribution as described on page 41.

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

Our common stock is listed on the Nasdaq National Market under the symbol
"BOKF". On July 1, 1999, the last reported sale price of our common stock was
$24.938 per share.

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

Investing in the common stock involves risks. See "Risk Factors" beginning on
page 8.

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

The Securities and Exchange Commission and state securities regulators have not
approved or disapproved these securities or determined if this prospectus is
truthful or complete. Any representation to the contrary is a criminal offense.




July 2, 1999



<PAGE>   3

                               TABLE OF CONTENTS


<TABLE>
<CAPTION>
                                                     Page
                                                     ----

<S>                                                 <C>
ABOUT THIS PROSPECTUS...........................        i
SPECIAL NOTE REGARDING FORWARD-LOOKING
  STATEMENTS....................................        i
PROSPECTUS SUMMARY..............................        1
RECENT DEVELOPMENTS.............................        5
THE OFFERING....................................        6
SUMMARY CONSOLIDATED FINANCIAL DATA.............        7
RISK FACTORS....................................        8
USE OF PROCEEDS.................................       13
PRICE RANGE OF COMMON STOCK AND DIVIDEND
POLICY..........................................       13
SELECTED CONSOLIDATED FINANCIAL DATA............       14
BUSINESS........................................       16
MANAGEMENT......................................       33
PRINCIPAL AND SELLING SHAREHOLDERS..............       37
DESCRIPTION OF CAPITAL STOCK....................       39
PLAN OF DISTRIBUTION............................       41
LEGAL MATTERS...................................       42
EXPERTS.........................................       42
WHERE YOU CAN FIND MORE INFORMATION.............       42
</TABLE>


                             ABOUT THIS PROSPECTUS

    This prospectus is part of a registration statement that we filed with the
SEC utilizing a "shelf" registration process. Under this shelf process, the
selling shareholders may sell the securities described in this prospectus in
one or more offerings from time to time in accordance with the Plan of
Distribution found on page 41. This prospectus provides you with a description
of the securities the selling shareholders may offer.

    You should rely only on the information contained in, or incorporated by
reference into, this prospectus and any accompanying prospectus supplement. We
have not authorized anyone to provide you with information different from that
contained in this prospectus supplement and any accompanying prospectus
supplement. The information contained in this prospectus is accurate only as of
the date of this prospectus, regardless of the time of delivery of this
prospectus or any sale of the common stock. In this prospectus, "we," "us" or
"our" refer to BOK Financial Corporation.

    This prospectus contains certain references to and information for banks
that are comparable to us. As used in this prospectus, references to comparable
banks refer to the banks (other than BOK Financial) constituting the Morgan
Stanley Mid-Cap Bank Index. The Morgan Stanley Mid-Cap Bank Index comprises 20
mid-size commercial banks (including BOK Financial) with market capitalizations
ranging in size from approximately $1.1 billion to $8.6 billion as of June 25,
1999.

               SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

    This prospectus and the information incorporated by reference includes
forward-looking statements within the meaning of Section 27A of the Securities
Act of 1933 and Section 21E of the Securities Exchange Act of 1934. Some of the
forward-looking statements can be identified by the use of forward-looking
words such as "believes," "contemplates," "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. These 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 and in other information contained in our publicly available SEC
filings.



                                       -i-

<PAGE>   4

                               PROSPECTUS SUMMARY

    You should read the following summary with the more detailed information
about us and our financial statements, including the notes to those financial
statements, included in this prospectus and in the documents incorporated by
reference in this prospectus.

    BOK Financial Corporation is the largest bank holding company headquartered
in the State of Oklahoma. We conduct business primarily in Oklahoma and
selected markets in neighboring states. We provide a broad array of financial
products and services to major corporations, middle-market companies, small
businesses, retail customers and other entities, including:

    o  corporate, small business and consumer lending;

    o  deposit taking;

    o  corporate treasury services and cash management;

    o  mortgage lending and servicing;

    o  trust and asset management services;

    o  automated teller machine network services; and

    o  capital markets services.

    We have the number one deposit market share in Oklahoma and a leading
market position in nine of the 11 Oklahoma counties in which we operate. As of
March 31, 1999, approximately 76% of our assets were managed in Tulsa and in
Oklahoma City and 8% in the Dallas/Fort Worth area, with additional assets
managed in other Oklahoma markets, Fayetteville, Arkansas and Albuquerque, New
Mexico. We are the largest originator of mortgage loans in Oklahoma, serve as
the state's leading fiduciary and own the state's largest ATM/EFT network and
supermarket banking network.

    As of March 31, 1999, we had:

    o  assets of $7.0 billion;

    o  loans of $3.6 billion;

    o  deposits of $4.3 billion; and

    o  shareholders' equity of $519.2 million.

For 1998, we had net income of $74.7 million, and for the three months ended
March 31, 1999, we had net income of $19.8 million.

BUSINESS SEGMENTS

    Our operations are divided into four primary segments and Other Financial
Services. As a percentage of our total revenue for the first quarter of 1999,
Corporate Banking represents 27%, Consumer Banking represents 18%, Mortgage
Banking represents 11%, Trust Services represents 13%, Other Financial Services
represents 24% and other revenue, primarily from asset and liability
management, represents the remaining 7%.

CORPORATE BANKING DIVISION:

    o  offers commercial and industrial loans, real estate financing,
       commercial mortgage loans, specialized industry loans, trade finance and
       letters of credit, lease financing, selected capital markets products
       and highly specialized treasury and cash management products;

    o  is the market leader in Oklahoma and has a significant presence in its
       largest counties; and



                                      - 1 -
<PAGE>   5


    o  had average loans of $2.3 billion and average deposits of $621 million
       in the first quarter of 1999.

CONSUMER BANKING DIVISION:

    o  provides a full line of deposit, loan and fee-based banking products to
       retail and small-business customers;

o  is the deposit market share leader in Oklahoma and, through our subsidiaries,
has the fourth largest deposit market share in Albuquerque and fifth largest in
the State of New Mexico; and

    o  had average loans of $300 million and average deposits of $1.7 billion
       in the first quarter of 1999.

MORTGAGE BANKING DIVISION:

    o  originates, purchases, sells and services individual residential
       mortgage loans;

    o  is the largest mortgage originator in Oklahoma;

    o  services a $7.1 billion mortgage portfolio; and

    o  had mortgage loan originations of $850 million in 1998 and $198 million
       in the first quarter of 1999.

TRUST SERVICES DIVISION:

    o  provides institutional, investment and retirement products, including
       401(k) plans, mutual fund products, cash management and trust services
       to affluent individuals, businesses, non-profit organizations and
       government entities; and

    o  is currently responsible for approximately $15 billion in assets.

OTHER FINANCIAL SERVICES:

    Other Financial Services comprises:

    o  TRANSFUND. This division provides merchants and financial institutions
       with a full line of ATM, debit/credit card and merchant payment
       processing products.

    o  BOSC, INC. This subsidiary specializes in the execution of securities
       transactions as well as public and municipal finance activities and is
       responsible for retail sales and brokerage activity.

    o  BANK OF TEXAS. This subsidiary provides corporate and consumer banking
       and other financial services in the Dallas/Fort Worth metropolitan area,
       focusing on middle-market banking.

    o  BANK OF ALBUQUERQUE. This subsidiary serves as the hub for expanding our
       consumer and commercial banking and fiduciary service operations in New
       Mexico.

    o  BANK OF ARKANSAS. This subsidiary provides corporate and consumer
       banking, public finance, capital markets services and other financial
       services in northwest Arkansas.

    As a percentage of our first quarter of 1999 revenue, TransFund represents
6%, BOSC, Inc. represents 4%, Bank of Texas represents 7%, Bank of Albuquerque
represents 6%, and Bank of Arkansas represents 1%.



                                      - 2 -
<PAGE>   6


PRIMARY MARKETS

    Our primary markets have recently experienced impressive growth and
diversification:

    o  OKLAHOMA. Oklahoma's gross state product has grown from $37 billion in
       1980 to $79 billion in 1998. Its economy has become significantly more
       diversified, with the percentage of its gross state product derived from
       the energy industry decreasing from 17.8% in 1980 to 5.3% in 1997.

    o  TEXAS. Our Texas operations are concentrated in the Dallas/Fort Worth
       metropolitan area, the ninth largest Consolidated Metropolitan
       Statistical Area in the United States. This market has experienced over
       17% population growth and over 31% household income growth from 1990
       through 1998.

    o  NEW MEXICO. Our New Mexico operations are concentrated in the
       Albuquerque metropolitan area, which has experienced over 15% population
       growth and over 38% household income growth from 1990 through 1998.

    o  ARKANSAS. Our Arkansas operations are focused in two counties in the
       northwest region. From 1990 through 1998, these counties have
       experienced over 29% population growth and over 36% household income
       growth.

    These growth rates significantly surpass U.S. historical growth levels,
which have been 8.3% in population growth and 27.3% in household income growth
from 1990 through 1998.

COMPETITIVE ADVANTAGES

    Our primary competitive advantages include:

    o  STRONG FINANCIAL PERFORMANCE AND CAPITAL POSITION. We have consistently
       achieved financial performance and growth superior to that of comparable
       banks. Highlights of our recent financial performance include:

        -- 19.8% compounded annual revenue growth from 1995 through 1998;

        -- 22.5% compounded annual fee-based revenue growth from 1995 through
           1998;

        -- 14.5% compounded annual diluted earnings per share growth from 1995
           through 1998; and

        -- 1998 tangible ROA of 1.46% and tangible ROE of 17.8%, compared to
           medians of 1.42% and 16.8%, respectively, for comparable banks.

       We have achieved this growth and profitability while maintaining solid
       reserve and capital levels.

    o  STRONG PRESENCE IN ATTRACTIVE AND GROWING MARKETS. We are the largest
       locally-owned and managed bank in Oklahoma and have the number one
       deposit market share in the state. Recent acquisitions have also
       provided us with significant market share in new regional markets,
       including Dallas/Fort Worth and Albuquerque. We rank among the top five
       banks in deposit market share in nine of the 11 Oklahoma counties in
       which we operate.

    o  EXCEPTIONAL LOCAL MARKET KNOWLEDGE AND CUSTOMER SERVICE. We have grown
       our market share by emphasizing our reputation for in-depth local market
       knowledge and strong customer service. In addition to having significant
       expertise in many specialized industries, our commercial lending
       officers have an average of seven years of service at BOK Financial and
       approximately 13 years of overall industry experience. In each of our
       markets, we identify our operations using a local name and provide local
       management with the necessary decision-making authority to provide a
       quick response to customer requests. We believe that our local market
       knowledge and commitment, specialized industry expertise and strong
       customer service were important factors leading to the growth of our
       deposit market share in Oklahoma from 8.3% in 1995 to 10.4% in 1998.



                                      - 3 -
<PAGE>   7

    o  DIVERSIFIED, FEE-BASED PRODUCT OFFERING. In the first quarter of 1999,
       our fee-based revenue represented over 46% of total revenue, which
       compares favorably to the median of 29% for comparable banks. We offer
       our customers a full line of products and services comparable to those
       provided by many larger, super-regional or national banks. These
       products include: treasury and cash management, selected capital markets
       services, mortgage loan related services, brokerage, trust services,
       asset management and certain trade finance products. Many of these
       products and services provide us with fee-based revenue as opposed to
       interest income. As a result, we enjoy this above average proportion of
       diverse, predictable fee-based revenue.

    o  EXPERIENCED AND HIGHLY INCENTIVIZED MANAGEMENT TEAM. Our senior
       management team has an average of 26 years of experience in financial
       services. Our chairman, Mr. George B. Kaiser, has been Chairman of the
       Board and majority owner since 1991. Our CEO, Mr. Stanley A. Lybarger,
       has been with BOK Financial for 25 years. In addition, our management
       compensation system is highly oriented toward employee retention and
       generation of long-term appreciation in equity ownership. Mr. Kaiser
       owns 74.1% of our diluted shares. In 1998, approximately 11% of our
       full-time employees participated in at least one of our stock option
       programs, and depending upon their tenure, members of our senior
       management team can expect to have almost 40% of their compensation
       derived from stock options.

    o  CONSISTENT UNDERWRITING APPROACH AND SUPERIOR CREDIT QUALITY. Our
       conservative credit culture and consistent and prudent underwriting
       approach have produced excellent credit quality. Our conservative
       underwriting approach emphasizes local market knowledge and experience,
       standardized credit evaluation criteria and an efficient and timely loan
       approval process without sacrificing credit quality. As of March 31,
       1999, our nonperforming assets to total loans and foreclosed assets
       ratio was 0.55%, compared to a median of 0.57% for comparable banks.

BUSINESS STRATEGY

    Our business strategy is to:

    o  FURTHER ENHANCE OUR LEADERSHIP POSITION IN THE OKLAHOMA MARKET. We have
       the number one deposit market share in the state and are among the five
       largest banks in terms of deposits in nine of the 11 Oklahoma counties
       in which we operate. We intend to strengthen this leadership position by
       pursuing several initiatives that leverage our Oklahoma market strengths.
       These initiatives include acquiring customers through targeted sales to
       desirable customer segments, developing new product and technological
       innovations and continuing our high levels of customer service.

    o  CAPITALIZE ON THE VOID CREATED BY MERGERS OF LEADING LOCAL BANKS INTO
       LARGE NATIONAL BANKS. We intend to continue our expansion by developing
       business with middle market companies that are no longer being served
       adequately by local banks due to consolidation in the banking industry.
       We believe that we offer middle market companies a full range of
       services typically provided by large banks, coupled with the customer
       service typically offered by smaller local banks. In addition to an
       increased emphasis on developing relationships with these customers, we
       are employing a carefully designed acquisition strategy which targets
       small to medium-size banks located in growing communities with large
       numbers of mid-sized businesses and upper-income customer bases. We
       believe that these banks afford us the platform from which to develop a
       middle market lending presence that capitalizes on the void resulting
       from a reduction in the number of banking firms which primarily target
       those customers. Our recent acquisitions in the Dallas and Albuquerque
       markets are examples of this strategy.

    o  CONTINUE TO GROW OUR FEE-BASED REVENUE. We believe that our ratio of
       approximately 46% of fee-based revenue to total revenue in the first
       quarter of 1999 represents one of the highest percentages of fee-based
       revenue of any bank in the country. However, we intend to continue
       growing our fee-based revenue contribution by executing a series of
       ongoing initiatives in our nationally competitive, niche fee-generating
       businesses, including Trust Services, Mortgage Banking, TransFund and
       BOSC, Inc., our securities brokerage subsidiary.

    o  IMPROVE OUR OPERATING EXPENSE MANAGEMENT AND EFFICIENCY RATIO. Our focus
       in prior years has been to build share in our home markets by taking
       advantage of disruptions from ongoing bank consolidations, while
       continuing to expand and develop our Texas franchise. While continued
       opportunities exist, we also have identified opportunities to improve
       our operating efficiency. To capitalize on these opportunities, we have
       developed and are pursuing a number of expense-reduction strategies
       including:

       -- personnel expense reduction;

       -- continued evaluation of outsourcing opportunities;

       -- consolidation of operational facilities; and

       -- revenue enhancement through differential pricing and improved float
          management.



                                      - 4 -
<PAGE>   8

RECENT DEVELOPMENTS

We recently acquired three banks located in the Dallas/Fort Worth area for
approximately $76 million in cash and an additional bank in Oklahoma for
approximately 2.4 million shares of our common stock (approximately $60
million).

<TABLE>
<CAPTION>
                                                                                   AS OF MARCH 31, 1999
                                                                             --------------------------------
     CLOSING                                                                  TOTAL       TOTAL        TOTAL
       DATE                  NAME                PLACE OF OPERATION          ASSETS       LOANS       DEPOSITS
       ----                  ----                ------------------          ------       -----       --------
                                                                                      (in millions)

<S>               <C>                            <C>                         <C>         <C>         <C>
     6/30/99      First National Bank & Trust    Muskogee, Oklahoma          $ 245.4      $90.6      $ 227.3
                  Company of Muskogee
     5/14/99      Canyon Creek National Bank     Richardson and McKinney,      104.8       56.8         97.2
                                                 Texas
     6/4/99       Mid-Cities National Bank       Tarrant County, Texas          78.6       42.8         72.1
     6/16/99      Swiss Avenue State Bank        Dallas, Texas                 227.2       49.0        182.6
</TABLE>

The three acquisitions in the Dallas/Fort Worth metropolitan area increased our
total assets in this area to approximately $977 million from $566 million at
March 31, 1999. They also have increased our deposits in the area from $404
million to $756 million, giving us an approximate 1.2% share in this $53.9
billion deposit market.

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

    Our principal executive offices are located at Bank of Oklahoma Tower,
Boston Avenue at Second Street, Tulsa, Oklahoma, 74172, and our telephone
number is (918) 588-6000.



                                      - 5 -
<PAGE>   9

                                  THE OFFERING

    The following summarizes the offering of our common stock by the selling
shareholders.


<TABLE>
<S>                                                 <C>
    Common stock offered hereby..................   2,371,809

    Common stock to be outstanding after
     this offering...............................   47,553,759 shares based on shares
                                                    outstanding as of June 30, 1999. This does
                                                    not include 2,736,445 shares of common stock
                                                    issuable upon the exercise of stock options
                                                    granted under our stock incentive plans, of
                                                    which options to purchase 2,054,043 shares
                                                    are currently outstanding but not
                                                    exercisable and options to purchase 682,402
                                                    shares are currently outstanding and
                                                    exercisable, and 5,970,264 shares of common
                                                    stock immediately issuable upon conversion
                                                    of preferred stock.

    Use of proceeds..............................   We will not receive any of the proceeds
                                                    from the sale of the shares by the selling
                                                    shareholders.

    Dividend policy..............................   Our present policy is to retain earnings
                                                    for capital and future growth, and management
                                                    has no current plans to recommend payment of
                                                    cash dividends on our common stock. Since 1996,
                                                    we have declared an annual dividend on our common
                                                    stock, payable in shares of our common stock, at
                                                    a rate of 3%.

    Nasdaq National Market symbol................   BOKF

    Risk Factors.................................   You should carefully consider all of the
                                                    information in this prospectus and the
                                                    accompanying prospectus supplement including the
                                                    discussion of risks beginning on page 8 of this
                                                    prospectus.
</TABLE>



                                      - 6 -
<PAGE>   10

                       SUMMARY CONSOLIDATED FINANCIAL DATA

    The summary consolidated financial and other data as of or for the periods
ended December 31, 1996, 1997 and 1998 are calculated from our audited
consolidated financial statements incorporated by reference into this
prospectus. The summary consolidated financial and other data as of and for the
periods ended March 31, 1998 and March 31, 1999 are calculated from our
unaudited consolidated financial statements incorporated by reference in to this
prospectus.

    You should read the following data with the more detailed information
contained in "Selected Consolidated Financial and Operating Data" included in
this prospectus and in "Management's Discussion and Analysis of Financial
Condition and Results of Operations" in our Annual Report on Form 10-K for the
Year Ended December 31, 1998, and Quarterly Report on Form 10-Q for the Three
Months Ended March 31, 1999, each of which is incorporated by reference into
this prospectus and with our consolidated financial statements and notes to the
consolidated financial statements incorporated by reference into this
prospectus.

    See "Selected Consolidated Financial Data" for information regarding
assumptions and definitions used in the presentation of our financial data.

<TABLE>
<CAPTION>
                                                                                                          THREE MONTHS ENDED
                                                                YEAR ENDED DECEMBER 31,                        MARCH 31,
                                                      -------------------------------------------     ---------------------------
                                                          1996            1997            1998            1998            1999
                                                      -----------     -----------     -----------     -----------     -----------
                                                                                                              (unaudited)

                                                                 (dollars in thousands, except per share and ratio data)

<S>                                                   <C>                   <C>             <C>             <C>             <C>
RESULTS OF OPERATIONS:
  Taxable-equivalent net interest revenue ........    $   135,804     $   165,167     $   191,545     $    44,366     $    52,231
  Provision for loan loss ........................          4,267           9,026          14,451           2,470           3,370
  Other operating revenue ........................        105,312         129,699         172,819          40,787          46,865
  Other operating expense ........................        159,028         195,166         228,655          57,193          63,593
                                                      -----------     -----------     -----------     -----------     -----------
  Income before taxes ............................         77,821          90,674         121,258          25,490          32,133
  Income tax .....................................         23,694          26,049          46,542           9,177          12,316
                                                      -----------     -----------     -----------     -----------     -----------
  Net income .....................................    $    54,127     $    64,625     $    74,716     $    16,313     $    19,817
                                                      ===========     ===========     ===========     ===========     ===========
PER COMMON SHARE:
  Net income--basic ..............................    $      1.17     $      1.40     $      1.62     $      0.35     $      0.43
  Net income--diluted ............................           1.06            1.25            1.44            0.31            0.38
  Book value--diluted (end of period) ............           7.98            9.68           11.09            9.73           11.34

BALANCE SHEET DATA (END OF PERIOD):
  Assets .........................................    $ 4,620,700     $ 5,399,642     $ 6,809,348     $ 5,632,667     $ 7,044,000
  Loans ..........................................      2,394,580       2,765,093       3,551,941       2,836,296       3,591,398
  Deposits .......................................      3,256,755       3,728,079       4,379,230       4,019,374       4,342,935
  Shareholders' equity ...........................        359,966         435,477         505,114         448,635         519,207

OTHER DATA:
  Return on average assets .......................           1.26%           1.27%           1.31%           1.19%           1.19%
  Tangible return on average assets ..............           1.43            1.42            1.46            1.34            1.36
  Return on average shareholders' equity .........          16.80           16.41           15.99           14.89           15.75
  Tangible return on average shareholders'
    equity .......................................          19.03           18.42           17.79           16.78           18.05
  Net interest margin ............................           3.54            3.66            3.72            3.65            3.57
  Efficiency ratio ...............................          67.84           67.49           62.89           67.23           65.48
  Tangible efficiency ratio ......................          64.01           64.50           60.31           64.53           62.21
  Tier 1 capital ratio ...........................          10.49            9.39            7.80            9.47            8.06
  Total capital ratio ............................          11.74           14.54           11.96           14.47           12.15
  Leverage ratio .................................           7.46            6.81            6.57            6.81            6.31
  Tangible shareholders' equity ratio ............           7.22            6.90            6.09            6.88            6.12
</TABLE>



                                     - 7 -
<PAGE>   11

                                  RISK FACTORS

You should carefully consider the following risks as well as the other
information included or incorporated by reference in this prospectus before
purchasing the common stock.

ADVERSE REGIONAL ECONOMIC DEVELOPMENTS COULD NEGATIVELY AFFECT OUR BUSINESS

    A substantial majority of our loans are generated in Oklahoma and other
markets in the southwest region, with approximately 95% of 1998 earnings
derived from Bank of Oklahoma. As a result, poor economic conditions in
Oklahoma or other markets in the southwest region may cause us to incur losses
associated with higher default rates and decreased collateral values in our
loan portfolio. In the mid-to-late 1980s, Oklahoma and other parts of the
region underwent an economic downturn that resulted in increases in the level
of delinquencies and losses for us and many of the other financial institutions
operating in the state. If another economic downturn were to occur, we would
expect our level of problem assets to increase accordingly. A regional economic
downturn could also adversely affect revenue from brokerage and trading
activities, mortgage loan originations and other sources of fee-based revenue.

ADVERSE ECONOMIC FACTORS AFFECTING PARTICULAR INDUSTRIES COULD HAVE A NEGATIVE
EFFECT ON OUR CUSTOMERS AND THEIR ABILITY TO MAKE PAYMENTS TO US

    Certain industry-specific economic factors also affect us. For example, as
of year-end 1998, 4.4% of our total loan portfolio was to borrowers in the
agricultural industry and 13.2% of our total loan portfolio was to borrowers in
the energy industry, both of which industries are historically cyclical. Low
commodity prices may adversely affect those industries and, consequently, may
affect our business negatively; prices for certain commodities are currently
low. In addition, as of year-end, 1998, 20.9% of our total loan portfolio is
from commercial real estate loans, and a portion of our recent growth has been
fueled by the general real estate recovery in Oklahoma. Accordingly, a
commensurate downturn in the real estate industry in Oklahoma could also have
an adverse effect on our operations.

FLUCTUATIONS IN INTEREST RATES COULD ADVERSELY AFFECT OUR BUSINESS

    Our business is highly sensitive to:

    o  the monetary policies implemented by the Federal Reserve Board, including
       the discount rate on bank borrowings and changes in reserve requirements,
       which affect our ability to make loans and the interest rates we may
       charge;

    o  changes in prevailing interest rates, due to the dependency of our banks
       on interest income; and

    o  open market operations in U.S. Government securities.

    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, including loans underlying
our holdings of mortgage-backed securities and termination of our mortgage
servicing rights. In recognition of the significant risk of loss on our
capitalized mortgage servicing rights in a declining interest rate environment,
we have undertaken a program to hedge this exposure through use of futures
contracts, call options and put options. In addition, changes in market interest
rates, 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. Our strategy of borrowing funds in the capital markets to supplement
deposit growth subjects us to additional interest rate and liquidity risk. 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 nonperforming assets and net
charge-offs, which could adversely affect our business. See "Management's
Discussion and Analysis of Financial Condition and Results of Operation--Market
Risk, Quarterly Report on Form 10-Q for the Three Months Ended March 31, 1999"
for a discussion of our management of interest rate risk.

OUR SUBSTANTIAL HOLDINGS OF MORTGAGE-BACKED SECURITIES AND MORTGAGE SERVICING
RIGHTS COULD ADVERSELY AFFECT OUR BUSINESS

    We have invested a substantial amount of our holdings in mortgage-backed
securities, which are investment interests in pools of mortgages.
Mortgage-backed securities are highly sensitive to changes in interest rates.
We mitigate this risk



                                     - 8 -
<PAGE>   12


somewhat by investing principally in shorter duration, adjustable rate mortgage
products which are less sensitive to changes in interest rates. Nonetheless, a
significant decrease in interest rates could lead mortgage holders to refinance
the mortgages constituting the pool backing the securities, subjecting us to a
risk of prepayment and decreased return on investment due to subsequent
reinvestment at lower interest rates.

    In addition, as part of our mortgage banking business, we have acquired
substantial holdings of mortgage servicing rights. The value of these rights is
also very sensitive to changes in interest rates. Falling interest rates tend to
increase loan prepayments, which may lead to cancellation of the related
servicing rights. Our investments and dealings in mortgage-related products
increases the risk that a decrease in interest rates could adversely affect our
business. We attempt to manage this risk by maintaining an active hedging
program for our mortgage servicing rights. See "Management's Discussion and
Analysis of Financial Condition and Results of Operations--Market Risk,
Quarterly Report on Form 10-Q, for the Three Months Ended March 31, 1999."

SUBSTANTIAL COMPETITION COULD ADVERSELY AFFECT US

    Banking is a competitive business. We compete actively for loan, deposit and
other financial services business in Oklahoma, as well as in our other markets.
Our competitors include a large number of small and large local and national
banks, savings and loan associations, credit unions, trust companies,
broker-dealers and underwriters, as well as many financial and nonfinancial
firms that offer services similar to ours. Recently, large national financial
institutions, such as Bank One and BankAmerica, have entered the Oklahoma
market. These institutions have substantial capital, technology and marketing
resources. Such large financial institutions may have greater access to capital
at a lower cost than we do, which may adversely affect our ability to compete
effectively. In addition, there have been a number of recent mergers involving
financial institutions located in Oklahoma and our other markets. There have
historically been significant limitations in Oklahoma on the ability of existing
banks to establish branches. On June 30, 1999, legislation restricting the
ability of state thrifts to branch expired. As a consequence, after June 30,
1999, banks will have an unlimited ability to establish branches in Oklahoma.
Accordingly, we may face increased competition from both merged banks and new
entrants to our markets.

    We have recently expanded into markets outside of Oklahoma, where we
compete with a large number of financial institutions that have an established
customer base and greater market share than we do. We may not be able to
compete successfully in these markets outside of Oklahoma.

    With respect to some of our services, we compete with non-bank companies
that are not subject to regulation. The absence of regulatory requirements may
give non-banks a competitive advantage.

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.

    We and our service providers are having to modify or replace significant
portions of computer software and hardware to ensure that our systems will
function correctly in the year 2000 and thereafter. As part of our
comprehensive Year 2000 compliance program, we have identified all of the major
application and processing systems and have 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 us 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. These plans will include a
definition of and a plan to address the most reasonably likely, worst case
scenario. We cannot guarantee, however, 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.

    The Year 2000 problem poses the following principal risks to our business:

    o  disruption of our business due to our failure to achieve Year 2000
       readiness;

    o  disruption of our business due to failure of third parties to achieve
       Year 2000 readiness; and



                                     - 9 -
<PAGE>   13

    o  disruption in our funding and repayment operations due to failure of fund
       providers and obligors to achieve Year 2000 readiness.

    We are funding the cost of the Year 2000 project by normal operating cash
flow. 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. See "Management's
Discussion and Analysis of Financial Condition and Results of Operations -- Year
2000 Considerations", Quarterly Report on Form 10-Q for the Three Months Ended
March 31, 1999 for a discussion of our Year 2000 compliance strategy.

YEAR 2000 LIQUIDITY NEEDS

    We may experience additional liquidity needs in connection with increased
deposit withdrawals due to customer concerns over the Year 2000 issue. Although
we have developed a contingency funding plan to prepare for this potential
liquidity need, there can be no assurance that such steps will be adequate. As
a result, significant customer withdrawals in advance or immediately following
January 1, 2000 could have a material adverse effect on our results of
operations or financial condition.

RISKS ASSOCIATED WITH ACQUISITIONS

    In order to grow our business, we have recently acquired, and expect to
acquire, other bank and nonbank businesses and assets from time to time.
Accordingly, we expect to face risks commonly encountered in making
acquisitions, including:

    o  possible loss of key personnel of our acquired businesses;

    o  difficulties assimilating the personnel and operations of our acquired
       businesses;

    o  possible disruption of our ongoing business and additional burdens on our
       management team;

    o  difficulties in maintaining uniform standards, controls, procedures and
       policies;

    o  possible regulatory and other impediments associated with making
       acquisitions; and

    o  possible unexpected increased costs related to acquisitions.

    We cannot be certain that we will realize the anticipated benefits from our
acquisitions or that we will be able to integrate the acquired businesses
successfully. If we fail to integrate acquired businesses successfully, this
could have a material adverse effect on our business.

ADVERSE FACTORS COULD IMPACT OUR ABILITY TO IMPLEMENT OUR OPERATING STRATEGY

    Although we have developed an operating strategy which we expect to result
in continuing improved financial performance, we cannot assure you that we will
be successful in fulfilling this strategy or that this operating strategy will
be successful. Achieving success is dependent upon a number of factors, many of
which are beyond our direct control. Factors that may adversely affect our
ability to implement our operating strategy include:

    o  deterioration of our asset quality;

    o  inability to reduce our noninterest expenses;

    o  inability to increase noninterest income;

    o  deterioration in general economic conditions, especially in our core
       markets;

    o  decreases in net interest margins;

    o  increases in competition; and

    o  adverse regulatory developments.



                                     - 10 -
<PAGE>   14

    In particular, we cannot assure you that we will be able to achieve our
plan to reduce expenses and improve our efficiency ratio. This plan is based
on estimates of cost savings and revenue enhancements attributable to various
planned initiatives, and actual results may vary from our estimates. In
particular, our plan is based on current conditions and does not take into
effect future cost increases that may result from acquisitions, internal
growth, wage and price increases or other factors.

ADVERSE EFFECTS OF BANKING REGULATIONS OR CHANGES IN BANKING REGULATIONS COULD
ADVERSELY AFFECT US

    We and our subsidiaries are extensively regulated under both federal and
state law. In particular, we are subject to the Bank Holding Company Act of
1956 and the National Bank Act. These regulations are primarily for the benefit
and protection of our customers and not for the benefit of our investors. In
the past, our business has been materially affected by these regulations. For
example, regulations limit our business to banking and related businesses, and
they limit the location of our branches and offices, as well as the amount of
deposits that we can own in a particular state. These regulations may limit our
ability to grow and expand into new markets and businesses.

    Additionally, under the Community Reinvestment Act, we are required to
provide services in traditionally underserved areas. Our ability to make
acquisitions and engage in new business may be limited by these requirements.

    In addition, the Federal Deposit Insurance Act of 1991 requires us to
maintain specified capital ratios. Any failure to maintain required capital
ratios would limit the growth potential of our business.

    Under a 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, we may
be required to commit financial and other resources to our subsidiary banks in
circumstances where we might not otherwise do so.

    The trend toward extensive regulation 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.

STATUTORY RESTRICTIONS ON SUBSIDIARY DIVIDENDS AND OTHER DISTRIBUTIONS AND DEBTS
OF OUR SUBSIDIARIES COULD LIMIT AMOUNTS OUR SUBSIDIARIES MAY PAY TO US

    We are a bank holding company, and a substantial portion of our cash flow
typically comes from dividends that 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 will be in the same position as other creditors.

RISKS ASSOCIATED WITH LOW LIQUIDITY

    A relatively small fraction of our outstanding common stock is actively
traded. Although this registration may increase the liquidity of our common
stock, we cannot be sure it will eliminate risks associated with low liquidity.
The risks of low liquidity include increased volatility of the price of our
shares. Low liquidity may also limit holders of our common stock in their
ability to sell or transfer our shares at the price, time and quantity desired.

OUR PRINCIPAL SHAREHOLDER CONTROLS A MAJORITY OF OUR SHARES

    Mr. George B. Kaiser owns a majority of the outstanding shares of our common
stock. Mr. Kaiser will continue to be able to elect all of our directors and
effectively to control the vote on all matters submitted to a vote of our common
shareholders.

    Mr. Kaiser's ability to prevent an unsolicited bid for BOK Financial or any
other change in control could have an adverse effect on the market price for our
common stock. A substantial majority of our directors are not officers or
employees of BOK Financial or any of its affiliates. However, because of Mr.
Kaiser's control over the election of our directors, he could change the
composition of our Board of Directors so that it would not have a majority of
outside directors.



                                     - 11 -
<PAGE>   15

POSSIBLE FUTURE SALES OF SHARES BY OUR PRINCIPAL SHAREHOLDER COULD ADVERSELY
AFFECT THE MARKET PRICE OF OUR COMMON STOCK

       Although Mr. Kaiser intends to maintain at least a majority ownership in
BOK Financial, he may sell shares of our common stock in compliance with the
federal securities laws at any time, or from time to time. The federal
securities laws will be the only restrictions on Mr. Kaiser's ability to sell.
Because of his current control of us, Mr. Kaiser could sell large amounts of
his shares of our common stock by causing us to file a registration statement
that would allow him to sell shares more easily. In addition, Mr. Kaiser could
sell his shares of our common stock without registration under Rule 144 of the
Securities Act. Although we can make no predictions 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, would adversely affect market prices. If Mr. Kaiser sells or
transfers his shares of our common stock as a block, another person or entity
could become our controlling shareholder.



                                     - 12 -
<PAGE>   16

                                 USE OF PROCEEDS

    We will not receive any of the proceeds from the sale of the shares by the
selling shareholders.


                 PRICE RANGE OF COMMON STOCK AND DIVIDEND POLICY

    Our common stock is quoted on the Nasdaq National Market under the symbol
"BOKF." The following table sets forth the high and low closing sale prices for
our common stock for the periods indicated, as reported by the Nasdaq National
Market. The share prices have been adjusted to reflect a two-for-one stock
split in the form of a 100% stock dividend paid on February 22, 1999, but not
for the annual 3% stock dividends paid in 1996, 1997 and 1998.

<TABLE>
<CAPTION>
                                              COMMON STOCK
                                                  PRICE
                                         -------------------------
                                            HIGH           LOW
                                         ----------    -----------
<S>                                      <C>           <C>
YEAR ENDED DECEMBER 31, 1997
  First quarter.......................... $ 15 3/16     $ 12 23/32
  Second quarter.........................   17 1/32       13 9/16
  Third quarter..........................   19 5/16       15 7/16
  Fourth quarter.........................   22 3/8        17 7/16
YEAR ENDED DECEMBER 31, 1998
  First quarter..........................   24 7/8        18 3/32
  Second quarter.........................   24 15/16      22 1/32
  Third quarter..........................   23 29/32      19 19/32
  Fourth quarter.........................   24 1/16       20 3/4
YEAR ENDED DECEMBER 31, 1999
  First quarter..........................   25 15/16      22 1/16
  Second quarter.........................   25 7/8        23 3/4

</TABLE>

    A recent reported last sale price for our common stock as reported on the
Nasdaq National Market is set forth on the cover page of this prospectus. As of
June 30, 1999, there were 1,225 holders of record of our common stock based on
number of accounts.

    Our present policy is to retain earnings for capital and future growth, and
management has no current plans to recommend payment of cash dividends on our
common stock. Our policy is also to pay an annual dividend on our common stock
payable in shares of our common stock at a rate of 3%.

    In each of 1996, 1997 and 1998, a 3% dividend payable in shares of our
common stock was declared and paid to holders of our common stock. In addition,
in 1996, 1997 and 1998, 139,344 shares, 107,230 shares and 68,765 shares,
respectively, of our common stock were issued in payment of dividends on our
Series A Preferred Stock in lieu of cash by mutual agreement of BOK Financial
and the holders of our Series A Preferred Stock.



                                     - 13 -
<PAGE>   17

               SELECTED CONSOLIDATED FINANCIAL AND OPERATING DATA

    The selected consolidated financial and other data as of and for the years
ended December 31, 1994, 1995, 1996, 1997 and 1998 are derived from our audited
consolidated financial statements that are incorporated in this prospectus by
reference. The selected consolidated financial and other data as of and for the
quarter ended March 31, 1998 and 1999 are derived from our unaudited
consolidated financial statements that are incorporated in this prospectus by
reference. 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" in our Annual Report for the year ended December 31,
1998, and Quarterly Report on Form 10-Q, for the Three Months Ended March 31,
1999, each of which is incorporated in this prospectus by reference, and with
our consolidated financial statements and the notes to the consolidated
financial statements incorporated in this prospectus by reference.

You should read the following information with the data in the table on the
next page:

    o  Per share data has been restated to reflect the two-for-one stock split
       in the form of a 100% stock dividend paid on February 22, 1999 and a 3%
       stock dividend paid on November 25, 1998.

    o  We have presented net interest income and income before income taxes on a
       taxable-equivalent basis using a combined federal and state statutory tax
       rate of 38.9%.

    o  Other operating expense includes merger and integration expense, which
       was $98,000 for 1996, $112,000 for 1997 and $2.0 million for 1998.

    o  Tangible return on average shareholders' equity is net income plus
       intangible amortization net of income taxes divided by average
       shareholders' equity.

    o  The efficiency ratio is noninterest expense not including foreclosed
       asset expense or income, as a percentage of the sum of net interest
       income (on a taxable-equivalent basis) and noninterest income.

    o  The tangible efficiency ratio is noninterest expense not including
       foreclosed asset expense or income and expenses from intangible
       assets, as a percentage of the sum of net interest income (on a
       taxable-equivalent basis) and noninterest income.

    o  The Tier 1 leverage ratio is computed by dividing Tier 1 capital, which
       is total shareholders' equity less net unrealized gains and losses on
       securities available for sale and intangible assets, by average tangible
       assets.

    o  The Tier 1 capital ratio is computed by dividing Tier 1 capital by risk
       weighted period-end assets. Risk weighted period-end assets equal the
       balance of the assets at risk less the portion of the allowance for
       credit losses which exceeds 1.25% of the balance of the assets at risk.
       The balance of the assets at risk is calculated by applying risk-weighted
       percentages per regulatory guidelines to total assets and off-balance
       sheet items.

    o  The tangible shareholders' equity ratio is tangible shareholders' equity
       divided by tangible assets.

    o  The total capital ratio is total risk-based capital divided by total
       risk-adjusted assets.

    o  The reserve for loan losses to loans is computed by dividing the reserve
       for loan losses by total loans, excluding residential mortgage loans held
       for sale which are carried at the lower of aggregate cost or market
       value.

    o  The provision for loan losses to average total loans is computed by
       dividing the annualized provision for loan losses by total average loans,
       excluding average residential mortgage loans held for sale.



                                     - 14 -
<PAGE>   18

<TABLE>
<CAPTION>


                                                                              YEAR ENDED DECEMBER 31,
                                                       ------------------------------------------------------------------------
                                                         1994            1995            1996           1997            1998
                                                       ----------     ----------     -----------      ----------     ----------
                                                                  (dollars in thousands, except per share and ratio data)
<S>                                                    <C>            <C>            <C>              <C>            <C>
RESULTS OF OPERATIONS:
Taxable-equivalent interest revenue ..............     $  229,175     $  282,479     $   298,897      $  354,115     $  395,880
Interest expense .................................        104,055        160,177         163,093         188,948        204,335
                                                       ----------     ----------     -----------      ----------     ----------
Taxable-equivalent net interest revenue ..........        125,120        122,302         135,804         165,167        191,545
Provision for loan losses ........................            195            231           4,267           9,026         14,451
Other operating revenue ..........................         74,364         91,146         105,312         129,699        172,819
Other operating expense ..........................        133,475        142,206         159,028         195,166        228,665
                                                       ----------     ----------     -----------      ----------     ----------
Income before income taxes .......................         65,814         71,011          77,821          90,674        121,258
Income tax expense ...............................         20,749         21,806          23,694          26,049         46,542
                                                       ----------     ----------     -----------      ----------     ----------
Net income .......................................     $   45,065     $   49,205     $    54,127      $   64,625     $   74,716
                                                       ==========     ==========     ===========      ==========     ==========
PER COMMON SHARE:
Net income-basic .................................     $     0.96     $     1.06     $      1.17      $     1.40     $     1.62
Net income-diluted ...............................           0.88           0.96            1.06            1.25           1.44
Book value-diluted (end of period) ...............           5.22           6.67            7.98            9.68          11.09
Common shares outstanding (end of period) ........         39,470         40,832          42,264          43,818         45,037
Weighted average common shares
outstanding-basic ................................         45,032         44,971          45,014          45,120         45,118
Weighted average common shares
outstanding-diluted ..............................         51,110         51,058          51,161          51,634         51,790
BALANCE SHEET DATA (END OF PERIOD):
Assets ...........................................     $3,927,276     $4,244,118     $ 4,620,700      $5,399,642     $6,809,348
Loans ............................................      1,844,053      2,194,368       2,394,580       2,765,093      3,551,941
Intangible assets ................................         43,846         37,134          28,276          67,796         95,935
Nonperforming assets .............................         24,214         32,687          23,411          24,232         17,716
Deposits .........................................      2,629,574      2,937,709       3,256,755       3,728,079      4,379,230
Subordinated debenture ...........................         23,000           --              --           148,356        146,921
Shareholders' equity .............................        236,902        301,565         359,966         435,477        505,114
BALANCE SHEET DATA (PERIOD AVERAGE):
Assets ...........................................     $3,580,373     $4,046,189     $ 4,302,427      $5,090,545     $5,712,791
Loans ............................................      1,718,508      2,012,574       2,252,216       2,598,718      2,978,438
Earning assets ...................................      3,177,134      3,603,355       3,834,705       4,510,970      5,064,001
Deposits .........................................      2,554,185      2,681,892       3,125,780       3,471,875      3,878,801
Shareholder's equity .............................        226,201        272,359         322,254         393,704        467,300
PROFITABILITY RATIOS:
Return on average assets .........................           1.26 %         1.22 %          1.26 %          1.27 %         1.31 %
Tangible return on average assets ................           1.38           1.34            1.43            1.42           1.46
Return on average shareholders' equity ...........          19.92          18.07           16.80           16.41          15.99
Tangible return on average
shareholders' equity .............................          21.90          19.85           19.03           18.42          17.79
Net interest margin ..............................           3.94           3.39            3.54            3.66           3.72
Efficiency ratio .................................          69.20          68.07           67.84           67.49          62.89
Tangible efficiency ratio ........................          66.40          65.27           64.01           64.50          60.31
RISK-BASED CAPITAL RATIOS:
Tier 1 capital ratio .............................         9.14 %         9.91 %         10.49 %          9.39 %         7.80 %
Total capital ratio ..............................          11.19          11.17           11.74           14.54          11.96
Leverage ratio ...................................           5.64           6.55            7.46            6.81           6.57
Return on average shareholders' equity ...........          19.92          18.07           16.80           16.41          15.99

CREDIT QUALITY RATIOS:
Reserve for loan losses to
nonperforming loans ..............................         190.27 %       130.73 %        239.70 %        279.86 %       495.05 %
Reserve for loan losses to loans .................           2.12           1.80            1.96            1.98           1.88
Provision for loan losses to average
total loans ......................................           0.01           0.01            0.19            0.35           0.50
Net loans charged off to average total loans .....           0.01           0.01           (0.12)           0.14           0.09
Nonperforming assets to total loans and
foreclosed assets ................................           1.31           1.49            0.98            0.87           0.50
Nonperforming assets to total assets .............           0.62           0.77            0.51            0.45           0.26
<CAPTION>
                                                             THREE MONTHS
                                                                 ENDED
                                                               MARCH  31,
                                                       --------------------------
                                                          1998            1999
                                                       ----------      ----------
                                                              (unaudited)

                                                          (dollars in thousands,
                                                     except per share and ratio data)
<S>                                                    <C>             <C>
RESULTS OF OPERATIONS:
Taxable-equivalent interest revenue ..............     $   95,074      $  108,841
Interest expense .................................         50,708          56,610
                                                       ----------      ----------
Taxable-equivalent net interest revenue ..........         44,366          52,231
Provision for loan losses ........................          2,470           3,370
Other operating revenue ..........................         40,787          46,865
Other operating expense ..........................         57,193          63,593
                                                       ----------      ----------
Income before income taxes .......................         25,490          32,133
Income tax expense ...............................          9,177          12,316
                                                       ----------      ----------
Net income .......................................     $   16,313      $   19,817
                                                       ==========      ==========
PER COMMON SHARE:
Net income-basic .................................     $     0.35      $     0.43
Net income-diluted ...............................           0.31            0.38
Book value-diluted (end of period) ...............           9.73           11.34
Common shares outstanding (end of period) ........         43,797          45,125
Weighted average common shares
outstanding-basic ................................         45,229          45,096
Weighted average common shares
outstanding-diluted ..............................         51,934          51,747
BALANCE SHEET DATA (END OF PERIOD):
Assets ...........................................     $5,632,667      $7,044,000
Loans ............................................      2,836,296       3,591,398
Intangible assets ................................         65,494          93,933
Nonperforming assets .............................         24,181          19,827
Deposits .........................................      4,019,374       4,342,935
Subordinated debenture ...........................        148,388         148,504
Shareholders' equity .............................        448,635         519,207
BALANCE SHEET DATA (PERIOD AVERAGE):
Assets ...........................................     $5,554,376      $6,750,179
Loans ............................................      2,822,147       3,523,454
Earning assets ...................................      4,928,513       5,933,983
Deposits .........................................      3,852,937       4,291,586
Shareholder's equity .............................        444,246         510,279
PROFITABILITY RATIOS:
Return on average assets .........................         1.19 %          1.19 %
Tangible return on average assets ................           1.34            1.36
Return on average shareholders' equity ...........          14.89           15.75
Tangible return on average
shareholders' equity .............................          16.78           18.05
Net interest margin ..............................           3.65            3.57
Efficiency ratio .................................          67.23           65.48
Tangible efficiency ratio ........................          64.53           62.21
RISK-BASED CAPITAL RATIOS:
Tier 1 capital ratio .............................           9.47%         8.06 %
Total capital ratio ..............................          14.47           12.15
Leverage ratio ...................................           6.81            6.31
Return on average shareholders' equity ...........          14.89           15.75

CREDIT QUALITY RATIOS:
Reserve for loan losses to
nonperforming loans ..............................         291.46 %        452.85 %
Reserve for loan losses to loans .................           2.02            1.94
Provision for loan losses to average
total loans ......................................           0.36            0.39
Net loans charged off to average total loans .....           0.10            0.04
Nonperforming assets to total loans and
foreclosed assets ................................           0.85            0.55
Nonperforming assets to total assets .............           0.43            0.28
</TABLE>



                                     - 15 -
<PAGE>   19

                                    BUSINESS

    BOK Financial Corporation is the largest bank holding company headquartered
in the State of Oklahoma. We conduct business primarily in Oklahoma and
selected markets in neighboring states. We provide a broad array of financial
products and services to major corporations, middle-market companies, small
businesses, retail customers and other entities, including:

    o  corporate, small business and consumer lending;

    o  deposit taking;

    o  corporate treasury services and cash management;

    o  mortgage lending and servicing;

    o  trust and asset management services;

    o  automated teller machine network services; and

    o  capital markets services.

    We have the number one deposit market share in Oklahoma and a leading
market position in nine of the 11 Oklahoma counties in which we operate. At
March 31, 1999, approximately 76% of our assets were managed in Tulsa and in
Oklahoma City and 8% in the Dallas/Fort Worth area, with additional assets
managed in other Oklahoma markets, Fayetteville, Arkansas and Albuquerque, New
Mexico. We are the largest originator of mortgage loans in Oklahoma, serve as
the state's leading fiduciary and own the state's largest ATM/EFT network and
supermarket banking network.

    As of March 31, 1999, we had:

    o  assets of $7.0 billion;

    o  loans of $3.6 billion;

    o  deposits of $4.3 billion; and

    o  shareholders' equity of $519.2 million.

For 1998, we had net income of $74.7 million, and for the three months ended
March 31, 1999, we had net income of $19.8 million.

COMPETITIVE ADVANTAGES

    We are a leading provider of financial services in Oklahoma and selected
markets in neighboring states. Our ability to maintain and further enhance our
competitive position is based on a number of significant competitive advantages
which include:

    o  STRONG FINANCIAL GROWTH AND CAPITAL POSITION. We have consistently
       achieved financial performance and growth superior to that of comparable
       banks:

       -- 19.8% compounded annual revenue growth from 1995 through 1998 and
          24.5% revenue growth in 1998;

       -- 22.5% compounded annual fee-based revenue growth from 1995 through
          1998 and 24.8% fee-based revenue growth in 1998, compared to the
          median 20.0% compounded annual fee-based revenue growth for comparable
          banks;

       -- 14.9% compounded annual net income growth from 1995 through 1998 and
          15.6% net income growth in 1998;

       -- 14.5% compounded annual diluted earnings per share growth from 1995
          through 1998 and 15.2% diluted earnings per share growth in 1998;

       -- 1998 ROA and ROE of 1.31% and 16.0%, compared to medians of 1.35% and
          15.4% for comparable banks; and



                                     - 16 -
<PAGE>   20

       -- 1998 tangible ROA and tangible ROE of 1.46% and 17.8%, compared to
          medians of 1.42% and 16.8%, respectively, for comparable banks.

    We have achieved this growth and profitability while maintaining solid
    reserve levels and capital ratios, as reflected below:

       -- provision for loan losses has exceeded net charge-offs in each of the
          last four years;

       -- reserves to loans at year-end were at 1.98% in 1997 and 1.88% in 1998;

       -- our Tier 1 capital ratio was 9.39% in 1997 and 7.80% in 1998, compared
          to medians of 10.69% and 10.25% for comparable banks;

       -- our total capital ratio was 14.5% in 1997 and 12.0% in 1998, compared
          to medians of 12.9% and 12.0% for comparable banks; and

       -- our leverage ratio was 6.81% in 1997 and 6.57% in 1998, compared to
          medians of 8.53% and 7.84% for comparable banks.

    A bank with better than 6% for the Tier 1 capital ratio, 10% for the total
    capital ratio and 5% for the leverage ratio is considered well-capitalized
    by regulatory agencies.

    We believe that our consistently strong financial performance and capital
    adequacy have provided us with the momentum and characteristics that are
    critical for continued business success.

    o  STRONG PRESENCE IN ATTRACTIVE AND GROWING MARKETS. We are the largest
       locally-owned and managed bank in Oklahoma with the number one deposit
       market share in the state and a leading position in nine of the 11
       Oklahoma counties in which we operate. Our deposit market share in
       Oklahoma grew from 8.3% in 1995 to 10.4% in 1998, without in-state
       acquisitions. We have also established a significant presence in the
       majority of the counties in which we operate outside of Oklahoma,
       including selected counties in Texas, New Mexico and Arkansas. We rank
       among the top five banks in terms of deposit market share in 12 of the
       17 counties in which we operate.

       While our presence in Oklahoma has been historically strong, recent
       acquisitions have provided us with a significant increase in market
       share in some of our newer markets. We recently achieved the number four
       deposit market share position in Albuquerque through our acquisition of
       17 branches in New Mexico from Bank of America. Recent acquisitions in
       the Dallas/Fort Worth metropolitan area have increased our deposits in
       the area from $404 million to $756 million, giving us an approximate
       1.2% share in this $53.9 billion deposit market. With the completion of
       these acquisitions, we believe that we have reached the necessary
       critical mass to be a significant competitive force in each of these
       markets.

       We have chosen to enter and expand our share in markets that we believe
       possess attractive demographics and future growth characteristics. The
       population growth rate of the Valencia County, New Mexico market is
       expected to be approximately 3.89% per annum over the next five years,
       and the Dallas/Fort Worth market area is expected to grow in excess of
       1.1% in population per annum over the same period. Our primary markets
       together are estimated to have a population growth rate of over 10% from
       1997 to 2002, compared to 4.5% for the United States over the same
       period. We believe that our strong presence in these growing markets will
       provide a platform for significant expansion of our business into the
       future.

    o  EXCEPTIONAL LOCAL MARKET KNOWLEDGE AND CUSTOMER SERVICE. We have grown
       our share in all of the markets in which we compete by emphasizing our
       reputation for in-depth local market knowledge and strong customer
       service. This reputation has been particularly valuable in allowing us to
       capitalize on the deterioration of competitors' customer service levels
       caused by ongoing merger and acquisition activity. Our senior management
       team in each of our major markets has extensive local experience. Our
       commercial lending officers have an average of seven years of service
       at BOK Financial and approximately 13 years of overall industry
       experience. This experience extends into a number of more specialized
       industries, including energy, real estate and agriculture. In each of our
       principal markets, we identify our operations using a local name and
       provide local management with the necessary decision-making authority to
       provide a quick response to customer requests.

       We believe that it is, in part, our combination of local market
       knowledge, commitment and specialized industry expertise that allows us
       to deliver superior customer service and build significant market share.

    o  DIVERSIFIED, FEE-BASED PRODUCT OFFERING. In the first quarter of 1999,
       our fee-based revenue represented over 46% of our total revenue, which
       compares favorably to the median of 29% for comparable banks. We offer
       our commercial and retail customers a full line of banking services and
       products comparable to those provided by many larger, super-regional or
       national banks. This product offering has enabled us to grow our customer
       base and market share while competing against larger institutions. Many
       of these products and services provide us with predominantly fee-based
       revenue as opposed to interest income. In Corporate Banking, our
       fee-based products include: treasury and cash management, asset
       management, selected capital markets services and certain trade finance
       products. In our other divisions, our fee-based products include:
       mortgage loan related services, ATM services, brokerage, trust services
       and asset management. In striving to serve all of



                                     - 17 -
<PAGE>   21

       our customers' banking needs, we have developed a significant presence
       in many of these businesses. As a result, we enjoy an above-average
       proportion of predictable, fee-based revenue. This relative diversity
       and predictability of revenue increases the stability of our earnings
       stream and financial performance.

    o  EXPERIENCED AND HIGHLY INCENTIVIZED MANAGEMENT TEAM. Our senior
       management team has an average of 26 years of experience in financial
       services. Most of our senior management team has had significant
       experience at other leading national banking organizations including Banc
       One, Bankers Trust, Comerica and NationsBank. Our Chairman, Mr. George B.
       Kaiser, has served as Chairman of BOK Financial and Bank of Oklahoma
       since 1991, when he acquired his current ownership interest. In addition
       to his banking investment, Mr. Kaiser is actively involved in the oil and
       gas exploration and production business, with interests in 22 states and
       two Canadian provinces. Our CEO, Mr. Stanley A. Lybarger, has been with
       BOK Financial for the past 25 years, gaining substantial experience
       across our organization in a variety of positions. We believe that our
       management team has industry and regional knowledge superior to that of
       our primary competitors in the Oklahoma market.

       We have historically encouraged a high level of employee ownership. Mr.
       Kaiser owns 74.1% of our diluted outstanding shares.

       Our management compensation system is highly oriented toward employee
       retention and generation of long-term appreciation in equity ownership by
       the management group. The primary non-cash compensation is a stock option
       plan which vests over a seven-year period. This program is intended to
       align the interests of management with those of our shareholders, while
       encouraging the retention of senior management. Depending upon their
       tenure, members of our senior management team can expect to have almost
       40% of their compensation derived from options. Participation in stock
       option plans is also used as an incentive for other bank officers.
       Approximately 302 employees participated in at least one of our stock
       option plans in 1998, representing approximately 11% of our total
       full-time employee base.

    o  CONSISTENT UNDERWRITING APPROACH AND SUPERIOR CREDIT QUALITY. The local
       market knowledge of our commercial relationship officers, as well as our
       extensive experience as a lender in the middle-market commercial, energy,
       agriculture and real estate markets, helps us to identify quality lending
       opportunities. In order to prudently capitalize on these opportunities,
       we employ a conservative underwriting approach that emphasizes local
       market and industry knowledge and experience as well as standardized
       credit evaluation criteria tailored by industry and asset class. By
       providing our commercial relationship officers with a standardized set of
       criteria, we provide both a more efficient and timely approval process,
       as well as a high degree of predictability and consistency, in our
       treatment of customers.

       Central to this approach is the "Credit Concurrence Officer" ("CCO"). The
       CCO is a senior level, highly experienced banker whose primary
       responsibility is to work closely with relationship managers in
       evaluating all new credit decisions over $2.5 million. Importantly, the
       CCO has no direct lending duties or business development responsibilities
       and is compensated solely upon the quality of his or her credit
       decisions.

       This consistent and prudent underwriting approach has allowed us to
       maintain and grow our market share without sacrificing credit quality. As
       of March 31, 1999, our nonperforming assets to loans and foreclosed
       assets ratio was 0.55%, compared to a median of 0.57% for comparable
       banks. In addition, our net charge-offs to average loans ratio was 0.04%,
       compared to a median of 0.27% for comparable banks.

       We believe that the maintenance of our strong credit culture and
       consistent underwriting approach is essential for sustaining and growing
       our market share in favorable economic climates, while avoiding
       deteriorated asset quality in adverse environments.


BUSINESS STRATEGY

    o  FURTHER ENHANCE OUR LEADERSHIP POSITION IN THE OKLAHOMA MARKET. One of
       our primary strengths is our number one deposit market share in the
       State of Oklahoma, particularly in the metropolitan markets of Tulsa
       and Oklahoma City. We rank among the five largest banks in terms of
       deposits in nine of the 11 Oklahoma counties in which we operate. At
       the end of 1998, our Corporate Banking Division had the leading market
       share in Tulsa and a significant market share in Oklahoma City. At the
       end of 1998, approximately 34% of commercial customers in Tulsa and 19%
       of commercial customers in Oklahoma City had their primary lending
       relationships with us. We currently have banking relationships with 16
       of the 20 largest public companies headquartered in the state and
       provide fiduciary services for 11 of these businesses. In addition, we
       are the largest originator of mortgage loans in Oklahoma, we serve as
       the state's leading fiduciary, responsible for over $15 billion of
       assets, and we own the state's largest ATM/EFT network and supermarket
       banking network.



                                     - 18 -
<PAGE>   22
       We believe that we will further enhance our leadership position in
       Oklahoma by focusing on our Oklahoma market strengths, which include:

       -- an historically strong presence and recognized brand name in Oklahoma;

       -- a broader product and service offering than our community bank
          competitors;

       -- an in-depth knowledge of local markets and high level of customer
          service;

       -- a reputation for consistently and prudently providing credit services
          to our customers throughout economic and market cycles;

       -- a loyal local customer base which continues to grow due to disruptions
          at other banks caused by ongoing merger and acquisition activity; and

       -- a record of service leadership in the middle-market business
          community.

       Additionally, the breadth and variety of our distribution channels makes
       us one of the most convenient banks in Oklahoma based upon number of
       branches and geographic coverage. As an example, we have built the
       largest supermarket banking network in the state through our strong and
       established relationship with Albertsons, one of the premier supermarket
       chains in the U.S. The favorable business climate and diversified economy
       in Oklahoma provide us with opportunities to increase revenue along all
       of our primary business lines. We believe our established strengths,
       together with our ability to think and act more entrepreneurially than
       our competitors, will allow us to grow our leadership position in
       Oklahoma in the future.

    o  CAPITALIZE ON THE VOID CREATED BY MERGERS OF LENDING LOCAL BANKS INTO
       LARGE NATIONAL BANKS. We believe that there is significant potential to
       build upon our competitive advantages in high growth markets outside of
       Oklahoma, and that we can capitalize on the market disruptions caused by
       consolidation within the banking system.  In addition to an increased
       focus on middle market companies no longer being adequately served by
       their traditional bank, we are employing a carefully designed bank
       acquisition strategy which targets small to medium-size banks located in
       growing communities with large numbers of mid-sized businesses and
       upper-income customer bases. The institutions that we target typically do
       not have the financial capacity and scale to provide their customers with
       the range of products and services required to meet all of their
       financial needs, but have an excellent reputation for customer
       responsiveness. Post acquisition, we improve our partners' overall level
       of customer service by combining our full range of products and services
       with our partners' local presence, experience and relationships.

       After entering a new market, we use our partner as a hub to develop
       additional business opportunities, primarily in the small and medium-size
       local business market. We retain and hire experienced bankers from local
       markets who have expertise in specific industries and market segments,
       such as energy, real estate, agriculture and middle-market commercial
       lending. Post integration, the subsidiary operates as an affiliate bank,
       making localized lending decisions in accordance with our comprehensive
       credit policy. Our philosophy is to offer the best of large bank services
       with the look and feel of a service-oriented community bank.

       Examples of the effective employment of this strategy include our recent
       acquisitions in the Dallas and Albuquerque markets.

       -- Dallas Acquisitions. In 1997, we acquired First National Bank of Park
          Cities in Dallas, which served the affluent markets of Highland Park
          and University Park in Dallas. Park Cities offered traditional upscale
          retail products and services, but lacked other services, including
          trust, significant commercial lending and investment services.
          Subsequent to this acquisition, we acquired a strong small business
          bank in the Dallas market, the First Texas Bank, which we combined
          with Park Cities to create Bank of Texas. We hired local bankers
          experienced in middle-market lending and retained both management
          teams who now serve as the senior management at Bank of Texas. Lending
          decisions for Bank of Texas are made locally, but in accordance with
          our credit guidelines to ensure overall credit quality. Bank of Texas,
          now a broad-based bank with a middle-market/small-business niche, is
          expected to experience significant internal and acquisition-related
          growth. In 1999, we have further expanded our presence in the Dallas/
          Fort Worth Metropolitan area through our acquisition of Swiss Avenue
          State Bank, Mid-Cities National Bank and Canyon Creek National Bank.
          We anticipate combining these newly acquired entities with Bank of
          Texas in the second quarter of 2000.

       -- New Mexico Acquisition. Through our acquisition of 17 Bank of America
          branches in New Mexico, we obtained entry into Bernalillo, Valencia
          and Sandoval Counties, among the fastest growing counties in New
          Mexico, and created the Bank of Albuquerque. This newly established
          bank, with $420 million in deposits and a loan portfolio of
          approximately $147 million, as of March 31, 1999, is the fourth
          largest bank in the City of Albuquerque and the fifth largest in the
          State of New Mexico in terms of deposits. We plan to develop our
          management team and introduce our products and services in a manner
          consistent with that utilized in Dallas.

       Focusing on high quality acquisition opportunities, we intend to apply
       this acquisition strategy throughout selected major midwest and southwest
       metropolitan business centers, such as Dallas, Fort Worth, Houston, the
       greater Kansas City area and other attractive regional markets.

    o  CONTINUE TO GROW OUR FEE-BASED REVENUE. Growing our fee-based revenue
       continues to be a major operating objective. While we believe that we
       have one of the highest percentages of fee-based revenue of any bank in
       the country, we see significant opportunities to grow further through the
       expansion and implementation of fee-generating businesses and products.



                                     - 19 -
<PAGE>   23

    The table below illustrates the percentage of total pre-tax income
contributed by our primary fee-generating businesses.

    Fee-based Operating Revenue

<TABLE>
<CAPTION>
                                                          YEAR ENDED DECEMBER 31, 1998
                                       ---------------------------------------------------------------------
                                                                                   INVESTMENT
                                         TRUST        MORTGAGE     TRANSFUND        SERVICES
                                       SERVICES(1)    BANKING    (ATM NETWORK)   (BOSC, INC.)(1)    TOTAL(1)
                                       -----------    -------    -------------   ---------------    --------
                                                                 (in thousands)

<S>                                     <C>           <C>           <C>             <C>           <C>
Fee-based operating revenue .......     $ 37,928      $ 44,379      $ 19,138        $ 14,941      $ 109,511
Fee-based operating expense .......       35,419        39,573        12,440          14,310         95,885
Pretax contribution ...............       12,463        10,940         6,954           1,557         30,893
Percentage contribution to
  consolidated net income .........        11.13%         9.78%         6.21%           1.39%         27.59%
</TABLE>

- ----------

(1) Approximately $6.9 million of investment revenue and $5.9 million in related
    expenses are reported in both Trust Services and BOSC, Inc. but excluded
    from Total.

<TABLE>
<CAPTION>
                                                                THREE MONTHS ENDED
                                                                  MARCH 31, 1999
                                       ---------------------------------------------------------------------
                                                                                   INVESTMENT
                                         TRUST        MORTGAGE     TRANSFUND        SERVICES
                                        SERVICES      BANKING    (ATM NETWORK)   (BOSC, INC.)(1)    TOTAL(1)
                                       -----------    -------    -------------   ---------------    --------
                                                                 (in thousands)
<S>                                     <C>           <C>           <C>          <C>                <C>
Fee-based operating revenue .......     $  9,961      $  9,926      $  5,711       $ 5,454          $ 29,246
Fee-based operating expense .......        9,880         9,261         3,380         4,925            25,930
Pretax contribution ...............        2,592         1,659         2,434           957             7,352
Percentage contribution to
  consolidated net income .........         8.70%         5.57%         8.17%         3.21%            24.67%
</TABLE>


- ----------

(1) Approximately $1.8 million of investment revenue and $1.5 million in related
    expenses are reported in both Trust Services and BOSC, Inc. but excluded
    from Total.

    We also have several businesses, including Commercial Deposits/Treasury and
    Retail Deposits, which provide us with a revenue stream that is more stable
    than that of traditional lending services. In the aggregate, these
    businesses and our other fee-generating businesses accounted for
    approximately 46% of our 1998 total revenue and 46% of our revenue for the
    three months ended March 31, 1999.

    We are expanding our fee-generating businesses through a number of ongoing
    initiatives:

       -- The Trust Services Division's recent growth initiatives include:
          workplace delivery of voluntary insurance products, a new, partially
          proprietary mutual fund asset allocation product, Trust Internet
          access and Employee Benefit Record-keeping System Internet access.
          Internet delivery of retail brokerage and research service is pending
          implementation.

       -- We have recently grown the Mortgage Banking Division through two
          acquisitions in the affluent metropolitan Kansas City market and one
          acquisition in Little Rock. Other recent Mortgage Banking initiatives
          include the creation of a Portfolio Retention Department designed to
          focus on providing mortgage services to our existing customer base.

       -- TransFund has recently introduced several new and innovative products
          and services, including off-line debit cards, business debit cards,
          direct debit point of sale and Internet payment processing.

       -- BOSC, Inc. is the result of the August 1998 merger of our securities
          units with Leo Oppenheim & Co., Inc., Oklahoma's leading public
          finance firm. In 1998, we were the largest underwriter of general
          obligation municipal securities in the State of Arkansas, serving as
          the lead underwriter on 22 new competitive issues. We were also a
          leading underwriter in Oklahoma, serving as lead underwriter on 24
          issues in 1998. Our acquisition of Leo Oppenheim has enabled us to
          also enter the revenue bond underwriting market, resulting in an
          additional nine lead- managed revenue bond transactions completed
          between August 15 and December 31, 1998. The new BOSC, Inc.
          strengthens the breadth of our fee-based products and services by
          providing specialized expertise in public and municipal finance,
          asset-backed securities and private placement activities.

    o  IMPROVE OUR OPERATING EXPENSE MANAGEMENT AND EFFICIENCY RATIO. We have
       identified expense management and productivity improvement as major
       corporate objectives for 1999 and 2000. In prior years, the unprecedented
       opportunity to gain market share resulting from merger- related
       disruptions required that we place more emphasis on business development
       than on expense management. While continued opportunities exist to gain
       customers and market share, we see a clear opportunity to enhance
       profitability through productivity improvement and expense management. In
       1998, our efficiency ratio was 62.9% and for the three months ended March
       31, 1999, it was 65.5%. Adjusted to exclude intangible amortization, the
       ratio was 60.3% for 1998 and 62.2% for the three months ended
       March 31, 1999.

    In 1998, we engaged the strategic consulting firm of Carreker-Antinori,
    Inc. to formulate a number of initiatives to increase income and to reduce
    expenses. In addition, a working group of senior executives chaired by our
    Chief Executive Officer meets monthly to identify specific areas and
    opportunities to reduce expenses.



                                     - 20 -
<PAGE>   24

    Initiatives generated by the consultants and our management working group
include:

       --personnel expense reduction;

       --reduction of inefficient outsourcing operations;

       --consolidation of operational facilities; and

       --revenue enhancement through differential pricing and improved float
          management.

    We believe these initiatives together will yield over $5 million in
ongoing pre-tax income improvement beginning in 1999. $2.2 million of this
improvement relates to personnel reductions already implemented for fiscal year
1999.

    Our estimates regarding expense reduction and improved efficiency are
forward-looking statements based on estimates of cost savings and revenue
enhancements attributable to various planned initiatives. Actual results may
vary from our estimates. In particular, the estimates are based on current
conditions and do not take into effect future cost increases that may result
from acquisitions, internal growth, wage and price increases or other factors
that may increase our expenses. See "Risk Factors--Adverse factors could impact
our ability to implement our operating strategy."

PRIMARY MARKETS

    As of March 31, 1999, approximately 76% of our assets were managed in Tulsa
and in Oklahoma City and 8% in the Dallas/Fort Worth area, with additional
assets managed in other Oklahoma markets, Fayetteville, Arkansas and
Albuquerque, New Mexico. However, after giving effect to the acquisitions of
Canyon Creek National Bank, Mid-Cities National Bank and Swiss Avenue State
Bank, we have increased our assets in the Dallas/Fort Worth area from $566
million to approximately $977 million, representing approximately 13% of our
total asset base (including assets resulting from the recent Muskogee
acquisition).

OKLAHOMA

    Historically, Oklahoma's economy has been largely dependent on the energy
industry and, to a lesser extent, the agricultural industry. However, following
the deterioration of energy prices in the mid-to-late 1980s and a subsequent
regional economic downturn, Oklahoma's economy became more diversified. While
energy continues to be an important business sector, Oklahoma has experienced
significant growth in many other sectors, including health care, aviation and
telecommunications. Consequently, Oklahoma's gross state product has grown
significantly, from approximately $48 billion in 1980 to approximately $79
billion in 1998. Oklahoma's gross state product has also become more
diversified, as shown in the table below.

Oklahoma Gross State Product

<TABLE>
<CAPTION>
                                         CONTRACT                     WHOLESALE,    FINANCIAL
                AGRICULTURE   ENERGY   CONSTRUCTION    MANUFACTURING    RETAIL      SERVICES    OTHER     TOTAL
                -----------   ------   ------------    -------------    ------      --------    -----     -----

<S>             <C>           <C>      <C>             <C>            <C>           <C>        <C>       <C>
1980..........     3.15%      17.83%        4.85%          14.61%         6.64%       11.33%     41.79%    100.00%
1997..........     2.72        5.33         3.10           16.98          6.13        12.51     53.23     100.00
                   ----        ----         ----           -----          ----        -----     -----     ------
change in %...    (0.43)     (12.50)       (1.75)           2.37         (0.51)        1.18     11.44         --
</TABLE>

    Oklahoma's two largest metropolitan areas, Tulsa and Oklahoma City, have
led the state's economic growth. These two business centers serve as corporate
or regional headquarters for a number of major domestic and international
companies, including CITGO Petroleum Corporation, Dollar Thrifty Automotive
Group Inc., Fleming Companies, Inc., Phillips Petroleum, Kerr-McGee and
Williams, Inc. Additionally, due in part to the state's highly skilled
workforce, companies such as American Airlines, General Motors Corporation, MCI
Worldcom, Lucent Technologies, Seagate Technologies and Whirlpool have
established major servicing and manufacturing operations in Oklahoma. A variety
of small businesses, in a number of different industries, continue to choose
both cities as major business locations.

    Median household income in Oklahoma has shown consistent growth. From 1990
to 1998, household income grew 29.6% in the Tulsa MSA and 27.0% in the Oklahoma
City MSA, compared to the U.S. median of 27.3%. During 1998, employment growth
was 3.5% in the Tulsa MSA and 2.1% in the Oklahoma City MSA, compared to the
national growth level of 2.5%.



                                     - 21 -
<PAGE>   25

Oklahoma State Government Revenue

    As Oklahoma's economic base has become increasingly diversified, the
state's reliance on oil-related businesses has decreased commensurately. For
example, in 1984, oil and gas severance taxes accounted for 26.7% of the total
tax revenue for Oklahoma. By 1998, the percentage of tax revenue attributable
to oil and gas severance taxes had dropped to 3.8%. This decrease occurred
while Oklahoma tax revenue increased from $2.6 billion in 1984 to almost $3.9
billion in 1998.

TEXAS

    Texas is the second most populous state in the country, with a population
of over 19.4 million in 1997. The state also has the country's third largest
state economy, according to the Texas Chamber of Commerce. In addition to the
energy industry, Texas has become a leader in technology, research and other
emerging industries in recent years.

    Our Texas operations are concentrated in the Dallas/Fort Worth area. Dallas
has more than 140,000 businesses and more than 5,000 corporate headquarters in
its metropolitan area. In recent history, the Dallas/ Fort Worth area has
experienced population and business growth superior to that of the majority of
other U.S. markets. In 1998, Fortune magazine reported that Dallas ranked sixth
in the number of Fortune 500 companies headquartered in its metropolitan area.
Sixteen Fortune 500 companies are located in the Dallas/ Fort Worth Metroplex.
In addition, the Dallas/Fort Worth area was rated one of the best places in
America to start and grow a company, ranking 13th out of 50 U.S. metropolitan
areas, according to data provided by the Dallas Chamber of Commerce. Dallas is
also among the largest high technology employment centers in the U.S. and is
expected to lead the nation in employment growth from 1997 through 2005,
according to data provided by the Dallas Chamber of Commerce.

    Also, according to data provided by the Dallas Chamber of Commerce, the
Dallas/Fort Worth Consolidated Metropolitan Statistical Area ("CMSA") is larger
in population than the majority of U.S. states and is the nation's ninth most
populous CMSA. By 2010, the Dallas/Fort Worth area is expected to be the fourth
largest CMSA in the nation. Household income in the area is expected to rise at
a faster rate than the national average.

The following tables illustrate population and income growth in the Dallas/Fort
Worth area.

Population Growth

<TABLE>
<CAPTION>
                                                           1990-1998                   1998-2003
           AREA                   1990           1998       % CHANGE    2003 ESTIMATE   % CHANGE
           ----                   ----           ----       --------    -------------   --------

<S>                           <C>            <C>            <C>         <C>              <C>
Dallas MSA.................     2,676,248      3,154,195      17.9%       3,399,780        7.8%
Fort Worth-Arlington MSA...     1,361,034      1,570,657      15.4        1,682,415        7.1
U.S........................   248,709,873    269,412,836       8.3      280,885,064        4.3
</TABLE>

Median Household Income Growth

<TABLE>
<CAPTION>
           AREA                  1990       1998      % CHANGE
           ----                  ----       ----      --------

<S>                            <C>        <C>           <C>
Dallas MSA..................   $ 32,739   $ 45,117      37.8%
Fort Worth-Arlington MSA....     32,161     41,972      30.5
U.S.........................     30,097     38,302      27.3
</TABLE>

NEW MEXICO

    In 1998, the State of New Mexico had a population of approximately 1.7
million. New Mexico has experienced rapid compounded annual population growth in
recent years. In 1997, its compounded annual population growth rate was the
ninth fastest among all the states in the U.S. From 1990 to 1998, New Mexico's
gross state product grew at a compounded annual rate of 5.6%. An area with
especially strong growth in New Mexico has been high technology. Major
corporations with production facilities located in New Mexico include Intel,
Motorola, General Electric, General Mills, Philips, Levi, Strauss and Sumitomo
Sitix Silicon. Our operations in New Mexico are concentrated in the Albuquerque
MSA. The following tables illustrate population and household income growth in
those markets.

Population Growth

<TABLE>
<CAPTION>
                                                    1990-1998                     1998-2003
       AREA                1990           1998       % Change    2003 Estimate    % Change
       ----                ----           ----       --------    -------------    --------

<S>                     <C>            <C>           <C>         <C>              <C>
Albuquerque MSA.....        589,131        681,530     15.7%          741,341        8.8%
U.S.................    248,709,873    269,412,836      8.3       280,885,064        4.3
</TABLE>

Median Household Income Growth

<TABLE>
<CAPTION>
       AREA               1990        1998      % CHANGE
       ----               ----        ----      --------

<S>                     <C>         <C>           <C>
Albuquerque MSA.....    $ 27,347    $ 37,895      38.6%
U.S.................      30,097      38,302      27.3
</TABLE>




                                     - 22 -
<PAGE>   26

ARKANSAS

    In 1998, Arkansas had a population of approximately 2.5 million. Principal
industries in Arkansas include manufacturing, agriculture, forestry and tourism.
Arkansas has experienced strong economic growth in recent years. From 1990 to
1998, the state's gross state product grew from $40.1 billion to $54.9 billion.
Sixty-eight Fortune 500 firms operate in Arkansas. Five of those firms, Wal-Mart
Stores, Tyson Foods, ALLTEL, Beverly Enterprises and Dillard's, are
headquartered in Arkansas.

    Our Arkansas operations are concentrated in Benton County and Washington
County, which include the towns of Fayetteville, Springdale, Rogers and
Bentonville. These two counties ranked first and sixth out of 74 Arkansas
counties in population growth from 1990 to 1998. The following tables
illustrate population and household income growth in these markets.

Population Growth

<TABLE>
<CAPTION>
                                                      1990-1998                   1998-2003
       AREA                1990           1998        % CHANGE   2003 ESTIMATE    % CHANGE
       ----                ----           ----        --------   -------------    --------

<S>                       <C>            <C>         <C>         <C>              <C>
Benton County........        97,499         133,534     37.0%          151,180       13.2%
Washington County....       113,409         140,233     23.7           151,661        8.2
U.S..................   248,709,873     269,412,836      8.3       280,885,064        4.3
</TABLE>

Median Household Income Growth

<TABLE>
<CAPTION>
       AREA                  1990         1998     % CHANGE
       ----                  ----         ----     --------

<S>                       <C>          <C>           <C>
Benton County........     $ 26,039     $ 35,350      35.8%
Washington County....       23,177       32,038      38.2
U.S..................       30,097       38,302      27.3
</TABLE>


BUSINESS SEGMENTS

CORPORATE BANKING DIVISION

    The following table provides summary historical financial data on the
Corporate Banking Division:

<TABLE>
<CAPTION>
                                                                                          THREE MONTHS ENDED
                                                YEAR ENDED DECEMBER 31,                       MARCH 31,
                                     --------------------------------------------     --------------------------
                                         1996            1997             1998           1998            1999
                                     -----------      -----------      ----------     ----------     -----------
                                                                           (in thousands)

<S>                                  <C>              <C>              <C>            <C>            <C>
RESULTS OF OPERATIONS:
  Net interest income ..........     $    56,449      $    65,888      $   77,493     $   17,123     $    19,801
  Noninterest income ...........          14,278           20,757          24,862          5,921           6,674
                                     -----------      -----------      ----------     ----------     -----------
  Total ........................          70,727           86,645         102,355         23,044          26,475
  Noninterest expense ..........          23,126           30,328          42,077         10,412           9,772
  Provision for loan loss ......             (96)            (133)             63             46            (337)
                                     -----------      -----------      ----------     ----------     -----------
  Income before income taxes ...     $    47,697      $    56,450      $   60,215     $   12,586     $    17,040
                                     ===========      ===========      ==========     ==========     ===========
  Average assets ...............     $ 1,449,637      $ 1,819,834      $2,171,023     $2,044,630     $ 2,598,249
  Average equity ...............         164,214          210,407         255,108        247,068         293,600
</TABLE>

    Our Corporate Banking Division has historically been one of our strengths.
Through this Division, we offer a broad spectrum of commercial banking services
to primarily middle-market companies and some of the nation's largest
corporations. These services include commercial and industrial loans, real
estate financing, commercial mortgage lending, energy industry loans,
agricultural loans, trade finance and letters of credit, lease financing and
selected capital markets products. Additionally, the Division also offers
highly specialized treasury and cash management products.

    The Corporate Banking Division and our banking subsidiaries are active
lenders in all of our primary geographic markets, including Oklahoma, Texas,
New Mexico, Arkansas, Kansas, Missouri and Colorado. The Division is organized
on both a geographical and customer basis. The Division is organized into three
distinct, geographically-oriented units, each of which is headed by an
experienced senior manager with strong local market knowledge. In addition, the
Division manages certain activities in accordance with the specific customer
segments and industries it serves:

    o  the Commercial and Industrial Group serves middle-market and larger
       companies;



                                     - 23 -
<PAGE>   27


    o  the Real Estate Group serves residential and commercial real estate
       developers, operators and builders;

    o  the Business Banking Group serves smaller family-owned businesses;

    o  the various Specialized Lending Groups serve companies operating in
       selected industries, including energy, agriculture, healthcare and
       banking/finance; and

    o  the Treasury Services/Cash Management Group provides a wide range of
       treasury and cash management services to companies of all sizes.

    The Division's primary objective is to develop relationships in which we
can serve as the customer's lead or primary bank. The Division attempts to meet
the full breadth of customer needs by offering a nationally competitive array
of depository, trust, investment, cash management and credit services which are
superior to those offered by our community bank competitors.

    At the end of 1998, our Corporate Banking Division had the leading market
share in Tulsa and a significant and growing market share in Oklahoma City.
Approximately 34% of commercial customers in Tulsa and 19% of commercial
customers in Oklahoma City have their primary lending relationships with us. We
believe that we oversee all but one of the retail lockbox accounts managed in
the State of Oklahoma. Following the acquisition of our two main Oklahoma
competitors by nationally-operating bank holding companies, we were successful
in winning all of their Oklahoma-based retail lockbox business.

    Our Corporate Banking Division competes with a variety of financial service
companies. These competitors include a number of community, regional, national
and international banks. In addition, we compete with commercial finance
companies, investment banks, leasing companies and insurance companies.

This Division's recent initiatives include:

    o  Regional expansion. Consistent with our strategy of focusing our growth
       in areas with higher growth rates than our home markets, we have
       established business development calling efforts in the Denver/Colorado
       Springs, Kansas City and Wichita markets. Our initial effort is directed
       toward identifying middle-market companies to which we can offer our
       array of services, in some situations using our expertise in specialized
       industries as a means to establish initial contact and credibility. As
       these efforts mature, we will assess the possibility of establishing loan
       production offices and potentially acquiring a bank or establishing a de
       novo bank in some of these markets. At December 31, 1998, approximately
       $50 million in loans were outstanding in these three markets, and we are
       focused on achieving loan growth in these markets in the future.

    o  Commercial leasing function. For several years, we have engaged in
       commercial leasing. The initial focus of our leasing activity was the
       financing of large scale equipment, such as gas compressors. We have
       developed a strategy to actively expand our leasing activity during 1999
       in order to broaden the financing alternatives we offer our existing
       customers, and to a lesser extent, to develop relationships with new
       customers. The total amount of leases outstanding at December 31, 1998
       was $38.8 million. Of this amount, $20.5 million represented leases
       originated in 1998. In May 1999, $29 million of gas compressor leases
       were liquidated at a gain, before taxes, of $3.6 million.

    o  Establishment of a Merchant Banking Unit. We are establishing a unit to
       provide non-traditional bank financing services to our existing
       customers. This unit will execute private placement of mezzanine
       financing and structured finance transactions and will utilize a
       syndications desk for larger, multi-bank credits. The principal focus of
       this unit will initially be on existing customers to reduce the
       competitive threat posed by larger banks that provide similar services.

    o  Enhanced technology. We continue to improve our information technology in
       an effort to enhance the efficiency of our operations, increase the
       productivity of our bankers and support staff and continue providing
       excellent customer service. Significant system improvements that are
       either ongoing or will begin this year include:

       -- enhanced loan operations;

       -- improved loan automation technology;

       -- improved software to measure customer profitability; and

       -- enhanced information and contact management systems for our
          relationship officers.



                                     - 24 -
<PAGE>   28


CONSUMER BANKING DIVISION

    The following table provides summary historical financial data on the
Consumer Banking Division:

<TABLE>
<CAPTION>
                                                                                     THREE MONTHS ENDED
                                              YEAR ENDED DECEMBER 31,                     MARCH 31,
                                     ----------------------------------------     -------------------------
                                        1996           1997            1998           1998          1999
                                     ----------     ----------     ----------     ----------     ----------
                                                                 (in thousands)

<S>                                  <C>            <C>            <C>            <C>            <C>
RESULTS OF OPERATIONS:
  Net interest income ..........     $   44,647     $   43,283     $   46,290     $   10,195     $    9,889
  Noninterest income ...........         19,853         21,800         23,156          6,430          7,804
                                     ----------     ----------     ----------     ----------     ----------
  Total ........................         64,500         65,083         69,446         16,625         17,693
  Noninterest expense ..........         49,911         50,879         52,395         12,258         11,975
  Provision for loan loss ......          1,817          2,520          2,116            527            383
                                     ----------     ----------     ----------     ----------     ----------
  Income before income taxes ...     $   12,772     $   11,684     $   14,935     $    3,840     $    5,335
                                     ==========     ==========     ==========     ==========     ==========
  Average assets ...............     $1,963,068     $1,894,535     $1,904,409     $1,932,739     $1,886,641
  Average equity ...............         55,332         44,600         46,767         44,813         43,432
</TABLE>

    Through the Consumer Banking Division, we provide our retail and
small-business customers with a full line of deposit, loan and fee-based banking
products. The Division serves approximately 200,000 households and over 7,500
business customers with 64 branches in Oklahoma. Additionally, the Division
serves as a significant referral source for BOSC's Retail Brokerage Division,
Mortgage Banking and the Business Banking Department of the Corporate Banking
Division. We also offer consumer banking services in Texas, New Mexico and
Arkansas through the Bank of Texas, Bank of Albuquerque, Bank of Arkansas,
Swiss Avenue State Bank, Mid-Cities National Bank and Canyon Creek National
Bank. The Division owns and operates approximately 284 ATMs located throughout
our major markets.

    The Division is organized into two business units responsible for marketing
and operations, and three geographic units responsible for eastern Oklahoma,
western Oklahoma and New Mexico. In the Dallas market, through our Bank of Texas
subsidiary, we have four offices which offer a variety of consumer and
commercial banking services and operate under the direct management of Bank of
Texas. The recent acquisitions of Mid-Cities National Bank, Canyon Creek
National Bank and Swiss Avenue State Bank have added six offices in the Dallas
market.

    The Consumer Banking Division's primary strategic objective is to be the
most convenient consumer bank in our markets. The Division conducts business
through four major distribution channels: traditional branches, supermarket
branches, the 24-hour ExpressBank call center and, more recently, the Internet.
We offer service seven days a week, 24 hours a day in numerous, accessible
locations throughout our major markets. The Division leads Community
Reinvestment Act ("CRA") compliance efforts for all of our banks and ensures
that appropriate CRA initiatives are implemented as we enter into new markets.

    Through our strong and established relationship with Albertsons, one of the
premier supermarket chains in the U.S., we have built the largest supermarket
banking network in Oklahoma. Of our 26 supermarket branches, 23 are located in
Albertsons. The average deposits of these supermarket locations are
significantly higher than comparable average deposits for branches of most other
major banks throughout the United States. In 1998, our supermarket banking
network generated $40 million of consumer loan applications, or 23% of the total
Oklahoma application volume in the Consumer Banking Division.

    Consumer Banking targets two classes of customers: consumer households and
businesses with sales under $1 million. The Division's deposit base is stable,
with customers over 55 years of age accounting for more than 70% of deposits.
The borrower base is also attractive, with customers between 35 and 55 years of
age accounting for over 62% of the Division's total loan portfolio. The small
business customers we serve are a broad and diverse customer class, generally
with annual revenues under $1 million. The Division typically handles credit
relationships for small businesses with borrowing needs of up to $150,000.

    In Tulsa and Oklahoma City, the Consumer Banking Division has long been an
established market leader. In New Mexico, Bank of Albuquerque is the fourth
largest bank in the city and fifth largest in the state in terms of deposits.

    Our Consumer Banking Division competitors include:

    o  large, multi-state bank holding companies and their divisions operating
       in Oklahoma;

    o  credit unions;

    o  smaller community banks that compete for small business customers; and



                                     - 25 -
<PAGE>   29


    o  national brokerage firms and home equity lenders.

This Division's recent initiatives include:

    o  Strategic Selling Initiative. In 1998, the Consumer Division retained
       Action Systems, Inc., a major strategy consulting firm, to develop a
       system to better measure and manage profitability. The new system enables
       our branches to create weekly performance targets and tactics to identify
       customers for cross-selling and retention efforts. This initiative has
       aided in the repricing of a number of lower-profitability accounts, while
       insulating high-value customers from the effects of these price changes.

    o  New branch/call center automation. In 1998, we began replacing our branch
       and call center automated systems with Unisys systems. By September 1999,
       these new platform and teller systems will be in place throughout the
       Division. The new systems will provide improved sales presentations,
       simplify the account opening process for multiple products and provide a
       link into a new consumer loan processing system that will improve loan
       turnaround time and efficiency.

    o  Remote Teller System. Since September 1998, the Division has been pilot
       testing Remote Teller technology. This technology allows us to replace
       some or all of our traditional teller windows with a two-way video
       connection and a pneumatic tube-delivery system (similar to drive-ins)
       that connects to teller workstations.

    o  24-Hour ExpressBank. In 1995, we developed the 24-hour ExpressBank that
       serves the Oklahoma, New Mexico and Arkansas markets with full sales and
       service seven days a week, 24 hours a day. In 1998, the 24-hour
       ExpressBank generated $39 million of consumer loan application volume, or
       23% of total Oklahoma application volume in the Consumer Banking
       Division. We expect that our 24-hour ExpressBank will begin providing
       services to our Dallas area customers in the second quarter of 1999.

    o  On-line banking services. In 1998, we introduced two web sites which
       enable customers to apply for consumer loans, On-line Banking and On-line
       BillPay, check mortgage rates and download account information. The web
       sites, www.bankofoklahoma.com and www.bankofalbuquerque.com, also support
       our branding strategy at the local level. We also plan to launch web
       sites for Bank of Texas and Bank of Arkansas in mid-year 1999 and to
       initiate an on-line brokerage service in the early part of the third
       quarter of 1999, which will be available to active BOSC, Inc. retail
       customers. We do not incorporate the contents of the websites into this
       prospectus.

MORTGAGE BANKING DIVISION

    The following table provides summary historical financial data on the
Mortgage Banking Division:

<TABLE>
<CAPTION>
                                                                                                     THREE MONTHS ENDED
                                                             YEAR ENDED DECEMBER 31,                      MARCH 31,
                                                       -------------------------------------      ------------------------
                                                          1996          1997         1998           1998           1999
                                                       ---------     ---------     ---------      ---------      ---------
                                                                                 (in thousands)
<S>                                                    <C>           <C>           <C>            <C>            <C>
RESULTS OF OPERATIONS:
  Net interest income ............................     $   4,247     $   5,099     $   6,264      $   1,212      $     994
  Noninterest income .............................        28,189        34,208        44,379          9,868          9,926
                                                       ---------     ---------     ---------      ---------      ---------
  Total ..........................................        32,436        39,307        50,643         11,080         10,920
  Noninterest expense ............................        27,750        33,204        41,863          9,501          9,261
  Provision for loan losses ......................           119           165           130             33           --
  Provision for impairment of mortgage servicing
     rights ......................................           361         4,100        (2,290)         3,000           --
                                                       ---------     ---------     ---------      ---------      ---------
  Income before income taxes .....................     $   4,206     $   1,838     $  10,940      $  (1,454)     $   1,659
                                                       =========     =========     =========      =========      =========
  Average assets .................................     $ 520,559     $ 386,985     $ 350,362      $ 378,799      $ 305,660
  Average  equity ................................        26,396        28,723        30,556         29,505         25,705
</TABLE>

    The Mortgage Banking Division is a full-service, prime mortgage banking
company which reports to the Consumer Banking Division. Through Mortgage
Banking, we originate, purchase and service individual residential mortgage
loans and acquire bulk mortgage servicing portfolios.

    Mortgage Banking is organized along three functional lines, each of which
is managed by an experienced veteran of the mortgage industry:

    o  Retail Production;

    o  Servicing; and

    o  Financial.


                                     - 26 -
<PAGE>   30


    The Division's primary strategic focus is to use technology to improve
customer service and operating efficiency by constantly evaluating and updating
our mortgage servicing systems, as well as exploring new ways to improve
production and reduce servicing costs. While we are the market leader in
mortgage servicing in Oklahoma, we are focused on expanding our business
outside of our home state. We service a $6.7 billion mortgage portfolio, with
pending acquisitions expected to add an additional $577 million to the
portfolio. We are currently positioning ourselves to offer our full range of
mortgage products in the State of Texas.

    Mortgage Banking's primary markets for originating new mortgages are
Oklahoma, Arkansas, Kansas and New Mexico. In 1998, we originated $850 million
in direct retail mortgage loans. In Oklahoma, we have lending outlets in
Oklahoma City, Tulsa, Owasso, Enid, Ponca City and Lawton. In Arkansas, through
our Bank of Arkansas subsidiary, we have offices in Fayetteville, Little Rock
and Bentonville. We also have operations in the greater Kansas City
metropolitan area and, through our Bank of Albuquerque subsidiary, in
Albuquerque.

    The Division's customers consist of individuals who are financing home
purchases and homeowners who are refinancing their existing mortgages. We
actively market our services directly to these consumers and through referrals
from our extensive local home builder and realtor network.

    Mortgage Banking has the largest share of mortgage originations in
Oklahoma. Our significant retail origination market share in Oklahoma has also
opened up opportunities to expand outside the state.

    We compete with local and national banks, mortgage brokers and credit
unions.

This Division's recent initiatives include:

    o  Creation of a Portfolio Retention Department. Mortgage Banking is a
       regional "originator" of home loans, and a national "servicer" of such
       loans, with approximately 88,000 loans serviced in 49 states and the
       District of Columbia. To take advantage of this potential customer base
       for new and refinancing mortgage lending, a "Portfolio Retention"
       department was formed in 1998 with the purpose of serving this customer
       base by offering refinance lending and the origination of new mortgages.
       This operation is conducted through in-bound telemarketing
       representatives, with additional contacts generated through Internet
       channels. In 1998, the Portfolio Retention Department generated
       approximately 684 loans with a total principal amount of over $70
       million.

    o  Broader automated underwriting. In all of its lending locations, Mortgage
       Banking continues to expand its automated underwriting capabilities
       through the use of proprietary credit-scoring based systems of Fannie Mae
       and Freddie Mac. These systems, which are integrated with Mortgage
       Banking's own automated origination systems, allow for increased
       productivity in processing and underwriting, thereby leading to more
       timely loan approvals for mortgage customers.

    o  Expansion into Little Rock and Kansas City. As a result of our 1998
       retail expansion program, Mortgage Banking expanded the coverage area of
       its mortgage origination businesses to both the Little Rock and the
       Kansas City metropolitan areas. Our expansion efforts in these markets
       were primarily through three acquisitions:

       -- In March 1998, we acquired Suburban Mortgage Co. in the Kansas City
          area, which became part of the Mortgage Banking Division.

       -- In August 1998, we acquired Arkansas Fidelity Mortgage in Little Rock,
          which now operates as Bank of Arkansas Mortgage Group in concert with
          our offices in Fayetteville and Bentonville, Arkansas.

       -- In March 1999, we acquired First Mortgage Investors, Inc., which
          expands our presence in the greater Kansas City metropolitan area.

    o  Hedging of interest rate exposure in the servicing portfolio. In 1998,
       the Mortgage Banking Division implemented a program that uses futures
       contracts and call and put options to hedge against the effect of falling
       interest rates on the fair value of its mortgage servicing rights
       portfolio. At March 31, 1999, realized hedging gains totaled $9.6
       million, net of accumulated amortization, while unrealized losses on open
       hedging positions totaled $3.1 million



                                     - 27 -

<PAGE>   31

TRUST SERVICES DIVISION

    The following table provides summary historical financial data on the Trust
Services Division:

<TABLE>
<CAPTION>
                                                                              THREE MONTHS ENDED
                                          YEAR ENDED DECEMBER 31,                  MARCH 31,
                                          -----------------------            ---------------------
                                        1996         1997         1998         1998         1999
                                        ----         ----         ----         ----         ----
                                                             (in thousands)
<S>                                   <C>          <C>          <C>          <C>          <C>
RESULTS OF OPERATIONS:
  Net interest income ...........     $  6,618     $  8,324     $ 10,079     $  2,074     $  2,511
  Noninterest income ............       26,902       30,084       37,928        8,809        9,961
                                      --------     --------     --------     --------     --------
  Total .........................       33,520       38,408       48,007       10,883       12,472
  Noninterest expense ...........       25,779       28,532       35,419        8,573        9,880
  Provision for loan losses .....          130          180          125           31         --
                                      --------     --------     --------     --------     --------
  Income before income taxes ....     $  7,611     $  9,696     $ 12,463     $  2,279     $  2,592
                                      ========     ========     ========     ========     ========
  Average assets ................     $219,851     $242,886     $295,660     $274,766     $306,223
  Average equity ................       20,898       24,233       30,188       27,657       33,542
</TABLE>

    Our Trust Services Division provides institutional, investment and
retirement products and services to affluent individuals and businesses,
non-profit organizations and governmental entities. We are now responsible for
more than $15 billion in assets.

    Our Trust Services Division consists of four units:

    o  PRIVATE FINANCIAL SERVICES ("PFS"). PFS targets individuals with a net
       worth of more than $1 million or an annual income of $200,000 or greater.
       We serve our market with a number of products and services, such as:

       -- deposit and cash management accounts;

       -- customized loans;

       -- full service brokerage;

       -- mutual fund asset allocation;

       -- private portfolio management; and

       -- personal trust and estate planning.

PFS serves 7,000 Oklahoma households. Collectively, the PFS business units
have grown revenue at an average rate of 18% per year since 1995.

The primary focus of PFS is to provide customized products and services to the
most affluent individuals within its chosen markets. This group's strategy
relies on building and maintaining highly-trained sales groups that focus on
client development and are compensated based upon attaining specific performance
measures. We also cross-sell other services to our PFS customers. Currently,
approximately 31% of our PFS customers use one or more of our other banking
services.

    o  INSTITUTIONAL AND EMPLOYEE BENEFITS. Institutional and Employee Benefits
       targets clients who require a full line of retirement plan products and
       services, as well as trustee, custody and investment management services
       for foundations and endowments. Our target market for 401(k) plan
       services includes firms with at least 50 employees in the local market
       and at least 500 employees in the national market. Our trust/custody area
       focuses on local non-profit organizations, pension plans and public
       entities that seek a local provider. We are the largest provider of
       institutional and employee benefits in Oklahoma.

This group's primary strategy is to build market share by cross-selling its full
line of retirement plan products and services to our broad customer base, as
well as to new customer groups gained through acquisitions.

    o  TRUST INVESTMENTS. Trust Investments is responsible for individual money
       management and for management of our American Performance Funds. It
       primarily targets retail customers, 401(k) plans and other pension plans.

Our American Performance Fund mutual fund family consists of ten funds which are
designed for retail investors. These funds have nearly $1.6 billion in assets
and grew approximately 18% in 1998. The Short-Term Income Fund ranked number one
in the U.S. for 1998, and the Growth Equity Fund ranked in the seventh, sixth
and fourth percentiles nationally for the last one, two and three-year periods,
respectively.



                                     - 28 -
<PAGE>   32

At year-end 1998, the group managed $5.6 billion in discretionary assets,
ranking us as the largest discretionary asset manager in Oklahoma. Our 356
customers for our 401(k) service rank us among the 40 largest providers in the
United States with in-house trust services.

    o  CORPORATE TRUST. Corporate Trust targets governmental bodies and
       companies requiring bond trustees, registrars, paying agents and escrow
       agents. Corporate Trust is a leader in the Oklahoma market in serving the
       fiduciary needs of governmental bodies and companies. Given our
       established strength in the Oklahoma market, our primary strategy is to
       expand these services into Texas, New Mexico and Arkansas.

    The Trust Services Division's primary markets are Oklahoma, Texas, New
Mexico and Arkansas. We have regional offices in Tulsa, Oklahoma City, Dallas
and Sherman, Texas and plan to open additional offices this year in
Fayetteville, Arkansas and Albuquerque.

    The Division's primary competitors are other banks and other financial
service providers, such as brokerage houses, national mutual fund companies,
private money management firms and insurance companies.

This Division's recent initiatives include:

    o  Workplace availability of insurance products. In November 1997, we
       introduced workplace availability for insurance products, which
       facilitates mass-market delivery of life, health and disability
       insurance products to customers. This initiative complements traditional
       pension/401(k) plan delivery and takes advantage of existing commercial
       banking relationships. In 1998, 34% of our total insurance revenue
       attributable to insurance was derived through workplace delivery.

    o  Foundations Mutual Fund asset allocation account. The full launch of our
       Foundations Mutual Fund asset allocation product began in March 1998.
       This product features ten distinct model portfolios of proprietary and
       nonproprietary mutual funds and is marketed by both trust and brokerage
       sales professionals to emerging affluent customers. This product tailors
       investment portfolios to the risk tolerance, time horizon and specific
       objectives of the investor.

    o  401(k)/Self Directed Option product. In 1996, we introduced a 401(k)/Self
       Directed Option product in response to plan participants' desire to
       exercise more control over their account balances. Our program offers
       core mutual fund options and a self-directed brokerage account option
       integrated with daily valuation, voice response and consolidated
       reporting. The target market for this product includes primarily
       corporate retirement pools with over $25 million in assets. We market
       this product nationally and have established customer relationships in
       several markets including Chicago, New York, Los Angeles and Dallas.
       Target customers include professional firms in the legal, medical,
       engineering, technology, architecture, accounting and financial fields.
       We presently have nine customers in our 401(k)/SDO program throughout six
       different states.

OTHER FINANCIAL SERVICES

    Other Financial Services includes our TransFund and BOSC, Inc. businesses
and Bank of Texas, Bank of Albuquerque and Bank of Arkansas.

TRANSFUND

    TransFund, our electronic card processing unit, provides merchants and
financial institutions with a full line of ATM, debit/credit cards and merchant
payment processing products.

    TransFund consists of four units:

    o  Operations and Technology;

    o  Sales and Marketing;

    o  Customer Service; and

    o  Financial Administration.

    TransFund's primary strategic goal is to increase market share both within
Oklahoma and in contiguous states by introducing new products and services to
current and potential customers. In addition, we continue to employ new
technology in an effort to improve customer responsiveness, increase
information and communication flow and maintain our position as a low cost
service provider.



                                     - 29 -
<PAGE>   33
    In our ATM/debit card business, we processed 58 million debit card
transactions in 1998, representing transactions conducted by more than one
million cardholders. In 1998, we served 238 financial institution customers in
Oklahoma, Kansas, Missouri, Arkansas, Texas, Colorado, New Mexico and Nevada. We
process transactions at approximately 995 ATMs located in these eight states.
In addition, through alliances with other processors, we offer our customers
access to more than 432,000 ATMs worldwide and debit card purchase capability at
more than 15 million merchant locations worldwide.

    TransFund markets products to a variety of merchants and financial
institutions. We focus on smaller financial institutions, a segment not heavily
targeted by our larger competitors. Additionally, we focus on the small to
mid-sized merchant market segment. In the merchant payment business, we
processed approximately 3.9 million merchant sales in 1998 with a value of $390
million at more than 5,900 merchant locations.

    TransFund's superior customer service and responsiveness has enabled us to
increase our market share significantly over the past few years. For the period
1995 through 1998, the number of debit transactions processed in the United
States grew 26.9% compounded annually, while the number of cardholders in the
United States increased at a compounded annual rate of 28.2%. Over the same
time period, we experienced compounded annual growth rates of 34.4% and 37.5%,
respectively, in the number of merchant locations and the dollar volume of
merchant payments processed. During 1998, TransFund's transaction volume grew
11.3% while total ATM transactions grew 2.2% nationally. While we have the
number one market share in Oklahoma, much of our growth in the past few years
has been in contiguous states.

    Our primary competitors are ATM/debit card processors and regional
electronic funds transfer networks. Our competitors have similar capabilities
to ours in terms of cost, product features and functionality. In the merchant
payment processing business, our major competitors are large national
commercial banks.

TransFund's recent initiatives include:

    o  Business debit cards. In 1998, we began offering the TransFund Business
       Check Card. This product was developed to target the purchasing and cash
       management needs of businesses with annual revenue of less than $10
       million and fewer than 100 employees. The business check card simplifies
       cash management and tracking of smaller business expenses, separates
       business and personal expenses and is widely accepted at merchant
       locations. It also helps our financial institution clients strengthen and
       expand their commercial relationships with small businesses.

    o  Direct debit point-of-sale. TransFund began offering direct debit
       point-of-sale purchase capability in 1998 for our financial institution
       clients that require a PIN-based debit card for purchases at merchant
       locations. We currently have relationships with the Interlink and PULSE
       networks to facilitate this PIN-based debit card product.

    o  Off-line debit cards. The TransFund Check Card is a signature-based card,
       which is linked to a cardholder's checking account and routed through the
       VISA payment system. This card can be used to make purchases at more than
       15 million merchant locations worldwide. During the last two years,
       TransFund has focused on introducing this product to most of our
       financial institution clients. At year-end 1998, 229 of our client
       financial institutions, or 96% of our total clients, used this product.

BOSC, INC.

    BOSC, Inc., a subsidiary of BOK Financial Corporation, is a full-service
securities firm with specialized expertise in public and municipal finance,
asset backed securities and private placements. BOSC is authorized to deal in
and underwrite a broader range of securities than traditional banks.

    BOSC is comprised of three divisions:

    o  the Retail Brokerage Division is responsible for retail customer sales
       and brokerage activity;

    o  the Institutional Investments Division executes securities transactions
       with other banks, corporations, foundations and public sector entities;
       and

    o  the Leo Oppenheim Division specializes in public and municipal finance
       activity, including financial advisory and underwriting services.

    In 1998, we consolidated Leo Oppenheim and two of our existing securities
companies into one full-service securities firm. BOSC's strategy is to be the
leading underwriter and dealer in Oklahoma public and municipal securities, to
play a leading role in asset-backed transactions in Oklahoma and to provide
medium-size corporate clients access to the capital markets. We intend to grow
selectively into surrounding markets, particularly with our Retail Brokerage
and Public Finance units.



                                     - 30 -
<PAGE>   34

    The 35 retail financial consultants of BOSC, Inc. serve more than 22,000
households, primarily in Oklahoma, as well as in Texas, Arkansas and
Albuquerque. Institutional sales, trading and underwriting activity is based out
of four primary locations: Oklahoma City, Tulsa, Little Rock and Fayetteville,
Arkansas. Our 32 institutional sales representatives and eight fixed-income
traders focus on Oklahoma and contiguous states. The Leo Oppenheim Division has
eight investment bankers in Oklahoma, three in Arkansas and two in Texas.

    The three BOSC divisions are further organized according to their primary
customer segments:

    o  the Retail Brokerage Division operates as a full-service broker/dealer.
       The principal products the Division offers are mutual funds, annuities,
       fixed-income securities and equities;

    o  the Institutional Investment Division focuses on Oklahoma and its
       contiguous states. In 1998, the mix of revenue from securities sales
       included approximately 25% from financial institutions, 16% from
       foundations and trusts, 15% from governmental entities and 11% from
       corporations. In 1998, approximately 64% of the revenue earned by the
       Institutional Investments Division was generated from Oklahoma-based
       institutional customers, but we have recently seen strong growth from
       outside of Oklahoma; and

    o  the Leo Oppenheim Division specializes in municipal finance, asset-backed
       securities and private placement activities. Among its clients are many
       of the largest issuers of municipal debt in Oklahoma. Although the
       Division is growing into adjacent states, the majority of its 1999
       revenue is expected to be derived from Oklahoma-based customers.

    The Leo Oppenheim Division is the market leader in the underwriting of
Oklahoma and Arkansas school bonds and Oklahoma housing bonds. With BOSC's
appointment as the sole underwriter of the Oklahoma Water Resource Board, we
hope to expand our market share in other public finance areas. We have one of
the largest networks of sales representatives in Oklahoma specializing in
public and municipal securities, and we have been particularly successful in
placing double-tax-exempt bonds with our customer base.

    Primary competitors for BOSC include:

    o  other full-service broker/dealers, financial planning firms and
       electronic brokerage firms, which compete with BOSC's Retail Brokerage
       Division;

    o  regional and national securities dealers, which compete with BOSC's
       Institutional Investment Division; and

    o  regional and national firms engaged in public finance underwriting in
       Oklahoma and its contiguous states and several small municipal financial
       advisory firms based in Oklahoma, which compete with BOSC's Oppenheim
       Division.

BOSC's recent initiatives include:

    o  Section 20, Tier II Authorization. We recently secured Tier II approval
       from the Federal Reserve Board, allowing us to expand BOSC's underwriting
       activity into the corporate debt market. This additional capability
       significantly enhances our position as a niche investment banking firm
       which focuses on public finance and asset-backed transactions in the
       region. As the only remaining provider of such services based in
       Oklahoma, we believe we have significant competitive advantages relative
       to out-of-state firms.

    o  Internet access to brokerage accounts. BOSC plans to offer our retail
       clients access to their brokerage accounts through Pershing's "Net
       Exchange Client" system. This service provides Internet access for
       account review, equity research, stock trade order entry, stock quote,
       market news and other information. Our clients will be able to access
       this system through a link from our current Web Page. We anticipate
       offering this service early in the third quarter of 1999.

BANKING SUBSIDIARIES

    We operate six out-of-state banking subsidiaries:

    o  Bank of Texas, which operates primarily in the Dallas/Forth Worth
       metropolitan area;

    o  Bank of Albuquerque, which serves as our hub in the largest and
       fastest-growing market in New Mexico; and

    o  Bank of Arkansas, which operates primarily in northwest Arkansas.

    o  Mid-Cities National Bank, Canyon Creek National Bank and Swiss Avenue
       State Bank, all recently acquired, which are based in the Dallas/Fort
       Worth metropolitan area.



                                     - 31 -
<PAGE>   35

    These subsidiaries have similar lines of business and focus on similar
market segments as Bank of Oklahoma. While tailored for the unique
characteristics of these markets and operating environments, our strategy in
these markets closely resembles the strategy we have pursued successfully in
Oklahoma. We plan to build these subsidiaries into banks with significant
expertise in selected niche products and industries, while offering a community
bank level of service quality.

    The primary products and services offered by Bank of Texas, Bank of
Albuquerque and Bank of Arkansas include middle-market and small- business
banking, consumer banking, trust services, treasury services and retail
investments through BOSC. Our primary customer focus is on small businesses and
middle-market corporations that have been affected by disruptions in their
banking services due to consolidations in the banking industry. We also offer
our products and services to retail customers, large corporations and public
and nonprofit entities.

    Primary competitors of our banking subsidiaries consist of various
community, regional, national and international banks operating in their
respective geographic areas, as well as other financial services companies.

    Market position and recent initiatives for each of our primary banking
subsidiaries are:

    o  Bank of Texas

       -- Bank of Texas currently has $404 million in deposits and a loan
          portfolio of approximately $318 million. Our three recent
          acquisitions in the Dallas/Fort Worth area, which we anticipate
          merging with Bank of Texas in the second quarter of 2000, increased
          our total assets in this area to approximately $977 million from $566
          million at March 31, 1999. They also have increased our deposits in
          the area from $404 million to $756 million, giving us an approximate
          1.2% share in this $53.9 billion deposit market.

       -- Recent initiatives include expansion in the Dallas/Fort Worth
          metropolitan area, as well as the establishment of a merchant banking
          unit. This unit will be located in our Dallas office. Initial business
          development for this unit will focus upon customers and prospects of
          Bank of Texas.

   o   Bank of Albuquerque

       -- Bank of Albuquerque currently has $420 million in deposits and a loan
          portfolio of approximately $147 million. It is the fourth largest bank
          in the City of Albuquerque and the fifth largest in the State of New
          Mexico in terms of deposits.

       -- Recent initiatives include expanding middle-market commercial banking
          to more fully service the middle-market customer segment, introducing
          on-line debit cards and launching an Internet site, which will enable
          customers to use various banking services via the Internet.

    o  Bank of Arkansas

       -- Bank of Arkansas currently has $87 million in deposits and a loan
          portfolio of approximately $76 million. It grew its total deposits by
          17.7% and net loans by 48.2% in 1998. Furthermore, Bank of Arkansas
          has become a significant employee benefit plan administrator in
          northwest Arkansas.

       -- Recent initiatives include expansion in the Ft. Smith, Arkansas
          market, establishment of a loan production office in Little Rock,
          addition of a local trust administrator for our northwest Arkansas
          employee benefit plans and ongoing efforts to enhance the sale of our
          treasury service products.



                                     - 32 -
<PAGE>   36

                                   MANAGEMENT

DIRECTORS, EXECUTIVE OFFICERS AND CERTAIN KEY EMPLOYEES

    The following table presents certain information with respect to the
executive officers, directors and certain key employees of BOK Financial as of
the date of this prospectus.

<TABLE>
<CAPTION>
         NAME                AGE          TITLE
         ----                ---          -----
<S>                          <C>  <C>
George B. Kaiser.........     56   Chairman of the Board
Stanley A. Lybarger......     49   President, Chief Executive Officer, and
                                   Director
James A. White...........     55   Executive Vice President and Chief
                                   Financial Officer
W. Wayne Allen...........     63   Director
C. Fred Ball, Jr.........     55   Director, President and Chief Executive Officer,
                                   Bank of Texas
James E. Barnes..........     65   Director
Sharon J. Bell*..........     49   Director
Luke R. Corbett..........     52   Director
Robert H. Donaldson......     56   Director
William E. Durrett.......     68   Director
James O. Goodwin.........     59   Director
V. Burns Hargis..........     53   Director, Vice Chairman
Howard E. Janzen.........     45   Director
E. Carey Joullian, IV         39   Director
Robert J. LaFortune*.....     72   Director
Philip C. Lauinger, Jr.*      63   Director
Frank A. McPherson*......     66   Director
Steve E. Moore*..........     53   Director
J. Larry Nichols.........     56   Director
Ronald J. Norick.........     57   Director
Robert L. Parker, Sr.....     75   Director
James W. Pielsticker.....     61   Director
E.C. Richards............     49   Director
James A. Robinson........     70   Director
L. Francis Rooney, III...     45   Director
David J. Tippeconnic*....     59   Director
Tom E. Turner............     60   Director, Chairman, Bank of Texas
Robert L. Zemanek........     49   Director
Jeffrey R. Dunn..........     36   Chairman, President, Bank of Arkansas
Paul M. Elvir............     59   Executive Vice President, Bank of Oklahoma
Mark W. Funke............     43   President, Bank of Oklahoma, Oklahoma City
Eugene A. Harris.........     57   Executive Vice President, Chief Credit
                                   Officer
H. James Holloman........     48   Executive Vice President, Bank of Oklahoma
David L. Laughlin........     46   Senior Vice President and President,
                                   Mortgage Banking
John C. Morrow...........     43   Senior Vice President, Financial Accounting
                                   & Reporting
Steven E. Nell...........     37   Senior Vice President, Corporate Controller
W. Jeffrey Pickryl.......     47   Executive Vice President, Bank of Oklahoma
Norman W. Smith..........     52   Executive Vice President, Bank of Oklahoma
Gregory K. Symons........     46   President, Bank of Albuquerque
Charles D. Williamson....     52   Executive Vice President, Bank of Oklahoma
</TABLE>

- ----------
* Member, Risk Oversight and Audit Committee



                                     - 33 -
<PAGE>   37

    George B. Kaiser. Mr. Kaiser has served as a Director of BOK Financial
since 1991 and serves as Chairman of the Board of BOK Financial and Bank of
Oklahoma. He also serves as President and principal owner of Kaiser-Francis Oil
Company, an independent oil and gas exploration and production company with
interests in 22 states and two provinces. Kaiser-Francis also owns Fountains
Continuum of Care, Inc., which holds interests in senior housing communities in
fifteen states.

    Stanley A. Lybarger. Mr. Lybarger has served as a Director of BOK Financial
since 1991. He also serves as President and Chief Executive Officer of BOK
Financial and Bank of Oklahoma. He has been with Bank of Oklahoma for 25 years.
Previously, he was President of Bank of Oklahoma's Oklahoma City Regional Office
and Executive Vice President of Bank of Oklahoma with responsibility for
corporate banking.

    James A. White. Mr. White is a Director of Bank of Oklahoma and Executive
Vice President, Chief Financial Officer and Treasurer of BOK Financial and Bank
of Oklahoma. He became Chief Financial Officer of BOK Financial and Bank of
Oklahoma in 1992. He formerly served as President and Chief Executive Officer of
First National Bank & Trust Co. of Tulsa, and currently is Chairman of the Board
of Hillcrest Healthcare System.

    W. Wayne Allen. Mr. Allen has served as a Director of BOK Financial since
1992. He also serves as Chairman and Director of Phillips Petroleum Company.
From 1993 until 1995, he served as a member of the Board of Directors of the
Federal Reserve Bank of Kansas City.

    C. Fred Ball, Jr. Mr. Ball has served as a Director of BOK Financial since
April, 1999. Mr. Ball is President and CEO of the Bank of Texas and is
responsible for Commercial Banking in the Dallas area. Before joining Bank of
Oklahoma in 1997, he was Executive Vice President of Comerica Bank-Texas and
later President of Comerica Securities Inc.

    James E. Barnes. Mr. Barnes has served as a Director of BOK Financial since
1991. He is retired Chairman of the Board, President, and Chief Executive
Officer of MAPCO Inc., which has subsequently merged with Williams, Inc. In
addition, he is a Director of Parker Drilling Co., Kansas City Southern
Industries, Inc. and SBC Communications, Inc.

    Sharon J. Bell. Ms. Bell has served as a Director of BOK Financial since
1993. She is also an Attorney and Managing Partner at Rogers and Bell in Tulsa,
Oklahoma. She serves as a Trustee and General Counsel to Chapman-McFarlin
Interests. Previously, she was a Director and President of Red River Oil
Company.

    Luke R. Corbett. Mr. Corbett has served as a Director of BOK Financial since
April, 1999. He serves as Chairman and Chief Executive Officer of Kerr-McGee
Corporation.

    Robert H. Donaldson. Mr. Donaldson has served as a Director of BOK Financial
since 1995. He is a Professor and former President of the University of Tulsa in
Tulsa, Oklahoma.

    William E. Durrett. Mr. Durrett has served as a Director of BOK Financial
since 1991. He also serves as Senior Chairman of the Board of American Fidelity
Corporation and American Fidelity Assurance Company. He is also a Director of
Oklahoma Gas & Electric Company and Chairman of the Board of Integris Health.

    James O. Goodwin. Mr. Goodwin has served as a Director of BOK Financial
since 1995. He serves as Chief Executive Officer of Oklahoma Eagle Publishing
Co. He is also the Sole Proprietor of Goodwin & Goodwin Law Firm in Tulsa,
Oklahoma.

    V. Burns Hargis. Mr. Hargis has served as a Director of BOK Financial since
1993. He also serves as Vice Chairman of BOK Financial and Bank of Oklahoma and
Director of BOSC. Formerly, he was an Attorney and Of Counsel to the law firm of
McAfee & Taft in Oklahoma City, Oklahoma.

    Howard E. Janzen. Mr. Janzen has served as a Director of BOK Financial since
1998. He is also President and Chief Executive Officer of Williams
Communications, a subsidiary of Williams, Inc.

    E. Carey Joullian, IV. Mr. Joullian has served as a Director of BOK
Financial since 1995. He also serves as President of Mustang Fuel Corporation
and Subsidiaries. In addition, he serves as President and Manager of Joullian &
Co., Inc.

    Robert J. LaFortune. Mr. LaFortune has served as a Director of BOK Financial
since 1993. He is self-employed in the investment and management of personal
financial holdings. He is also a Director of Williams, Inc.

    Philip C. Lauinger, Jr. Mr. Lauinger has served as a Director of BOK
Financial since 1991. He also serves as Chairman and Chief Executive Officer of
Lauinger Publishing Company. Previously, he was Chairman of the Board and Chief
Executive Officer of PennWell Publishing Co.

    Frank A. McPherson. Mr. McPherson has served as a Director of BOK Financial
since 1996. He also served as Chairman of the Board and Chief Executive Officer
of Kerr-McGee Corporation from 1983 to 1997. He is a member of the Board of
Directors of Kimberly-Clark Corp., Conoco Inc.,



                                     - 34 -
<PAGE>   38

Tri-Continental Corporation, Seligman Quality Fund, Inc., Seligman Select
Municipal Fund, Inc. and Seligman Group of Mutual Funds and is a former Director
of the Federal Reserve Bank of Kansas City.

    Steven E. Moore. Mr. Moore has served as a Director of BOK Financial since
1998. He also serves as Chairman, President and Chief Executive Officer of OGE
Energy Corp. In addition, he is Director of the Oklahoma City Chamber of
Commerce, Oklahoma State Chamber of Commerce and Edison Electric Institute.

    J. Larry Nichols. Mr. Nichols has served as a Director of BOK Financial
since 1997. He is the President and Chief Executive Officer of Devon Energy. He
also serves as Director of Independent Petroleum Association of America and the
Domestic Petroleum Counsel. He is on the Board of Governors for the American
Stock Exchange. In addition, he serves as Director of Smedvig ASA, CMI
Corporation and Caribou Communications Company.

    Ronald J. Norick. Mr. Norick has served as a Director of BOK Financial since
April, 1999. He is Controlling Manager, Norick Investments Company, L.L.C. He
previously served as Mayor of Oklahoma City from 1987 until 1998 and was
President of Norick Brothers, Inc. from 1981 to 1992. In addition, he is a
Director of Sport Haley, Inc., Oklahoma Medical Holdings, Ltd., and the Oklahoma
City Chamber of Commerce.

    Robert L. Parker, Sr. Mr. Parker has served as a Director of BOK Financial
since 1991. He is the Chairman and Director of Parker Drilling Co. In addition,
he serves as a Director of Weatherford-Enterra Corp., Clayton Williams Energy,
Inc. and Norwest Bank of Texas-Kerrville.

    James W. Pielsticker. Mr. Pielsticker has served as a Director of BOK
Financial since 1996. He is the President of Arrow Trucking Co.

    E.C. Richards. Mr. Richards has served as a Director of BOK Financial since
1997. He is also Executive Vice President and Chief Operating Officer for Sooner
Pipe and Supply Corporation.

    James A. Robinson. Mr. Robinson has served as a Director of BOK Financial
since 1993. He is self-employed in the investment and management of personal
financial holdings and in the ranching business.

    L. Francis Rooney, III. Mr. Rooney has served as a Director of BOK Financial
since 1995. He is Chairman of the Board and Chief Executive Officer of Manhattan
Construction Company.

    David J. Tippeconnic. Mr. Tippeconnic has served as a Director of BOK
Financial since 1998. He is the President, Chief Executive Officer and Director
of CITGO Petroleum Corporation. In addition, he is the Director of the American
Petroleum Institute, St. Francis Health Systems, the Boy Scouts of America and
Southdown, Inc.

    Tom E. Turner. Mr. Turner has served as a Director of BOK Financial since
1998. He is the Chairman of Bank of Texas, NA. Prior to the Bank of Texas, he
served as Chairman and Chief Executive Officer of the First National Bank of
Park Cities in Dallas, Texas, which was acquired by BOK Financial on February
12, 1997. He had been the Chief Executive Officer of FNB Park Cities since 1984.

    Robert L. Zemanek. Mr. Zemanek has served as a Director of BOK Financial
since 1994. He is the President of Energy Delivery, at Central & South West
Services. Previously, he served as the President, Chief Executive Officer and
Director of Public Service Company of Oklahoma and as Director of Central and
Southwest Service, Inc., Ash Creek Mining Company and the University of Tulsa.

    Jeffrey R. Dunn. Mr. Dunn is Chairman and President of Bank of Arkansas.
Prior to becoming President of Bank of Arkansas, he served as Senior Vice
President of Commercial Lending. He has been with Bank of Oklahoma for ten
years.

    Paul M. Elvir. Mr. Elvir is the Executive Vice President and Manager of the
Bank of Oklahoma Operations and Technology Division. Before joining Bank of
Oklahoma in 1997, he was the President of Liberty Payments Services, Inc., a
subsidiary of Banc One Services Corporation. He had previously served as an
Executive Vice President of Banc One Services Corporation.

    Mark W. Funke. Mr. Funke is President of the Bank of Oklahoma, Oklahoma City
and heads our Commercial Banking Division in Oklahoma City. He also heads our
Business Banking Group, which manages our statewide small-business banking
efforts and all of our Community Banking Offices. He joined BOK Financial in
1984 as Vice President in the financial institutions department and was named to
his current position in 1997. Before joining BOK Financial, he was a commercial
lender with Republic Bank in Houston for seven years.



                                     - 35 -
<PAGE>   39

    Eugene A. Harris. Mr. Harris has served as a Director of Bank of Oklahoma
since 1991. He is also the Director and Executive Vice President of Bank of
Oklahoma, Chief Credit Officer and Manager of the Credit Administration
Division. He has been with Bank of Oklahoma for 17 years.

    H. James Holloman. Mr. Holloman is the Executive President of Bank of
Oklahoma and Manager of Trust Services. Before joining Bank of Oklahoma, he
spent 12 years at First Union National Bank in Charlotte, NC. He has been with
Bank of Oklahoma since 1985.

    David L. Laughlin. Mr. Laughlin is the Senior Vice President and President
of the Mortgage Banking Division. He joined BOK Financial in 1986 as the
Secondary Marketing Manager in charge of retail production and secondary
marketing, and he became President of Mortgage Banking in 1993. He has served
two terms on the Fannie Mae Advisory Board and is a past President of the
Oklahoma Mortgage Bankers' Association and the Tulsa Mortgage Bankers
Association.

    John C. Morrow. Mr. Morrow is Senior Vice President and serves as Director
of Financial Accounting and Reporting. He joined Bank of Oklahoma in 1993. He
was previously with Ernst & Young for 10 years.

    Steven E. Nell. Mr. Nell is Senior Vice President and serves as Corporate
Controller. He joined Bank of Oklahoma in 1992. He was previously with Ernst &
Young for eight years.

    W. Jeffrey Pickryl. Mr. Pickryl is the Executive Vice President responsible
for Corporate Banking in Tulsa, as well as statewide energy and real estate
lending. Before joining Bank of Oklahoma in 1997, he was President and Chief
Credit Officer for Liberty Bancorp, Inc. in Tulsa, where he worked for 14 years.
He was previously with Arizona Bank in Phoenix.

    Norman W. Smith. Mr. Smith is the Executive Vice President of Bank of
Oklahoma and manages the Consumer Banking Division. In addition to BOKF's branch
network, he is responsible for mortgage operations, corporate marketing and
corporate Community Reinvestment Act activities. Before joining Bank of Oklahoma
in 1991, he was Senior Vice President and Manager, Branch Sales and Services
Division, at Ameritrust Bank in Cleveland, Ohio.

    Gregory K. Symons. Mr. Symons is the President of the Bank of Albuquerque
and is responsible for Corporate Banking in New Mexico. He previously served as
Bank of Oklahoma's Senior Vice President of Regional Banking and Commercial
Lending/Sales. He has been with Bank of Oklahoma since 1976 and was named to his
current position in 1998.

    Charles D. Williamson. Mr. Williamson is the Executive Vice President of
Capital Markets of Bank of Oklahoma and Chairman and Chief Executive Officer of
BOSC. Before joining Bank of Oklahoma six years ago, he was the Manager of the
Investment Division at First Interstate Bank of Arizona and the Manager of the
Investment Division at First Interstate Bank of Oklahoma.



                                     - 36 -
<PAGE>   40

                       PRINCIPAL AND SELLING SHAREHOLDERS


    OUR PRINCIPAL SHAREHOLDER

    As of the date of this prospectus, our principal shareholder, Mr. George B.
Kaiser, beneficially owns 74.1% of our common stock after giving effect to
conversion of 249,490,880 shares of our Series A Preferred Stock owned by him.
Mr. Kaiser has been our Chairman since 1991. He is also the owner and CEO of
Kaiser-Francis Oil Co., an oil and gas exploration and production company that
he has managed for more than 25 years. Kaiser-Francis also owns Fountains
Continuum of Care, Inc., which holds interests in senior housing communities in
15 states.

    SELLING SHAREHOLDERS

    The following table identifies shareholders that will be offering their
common stock and the number of shares to be sold by each shareholder, as well as
the number of shares beneficially owned before and after the offering. The
selling shareholders are former shareholders of First Bancshares of Muskogee,
Inc. which we acquired on June 30, 1999. All selling shareholders will own less
than one percent of our common stock before and after completion of the
offering.

<TABLE>
<CAPTION>
                                                   SHARES OWNED        SHARES          SHARES OWNED
                                                 PRIOR TO OFFERING   BEING OFFERED     AFTER OFFERING
                                                 -----------------   -------------     --------------
               NAME                                    NUMBER           NUMBER             NUMBER
               ----                                    ------           ------             ------
<S>                                                  <C>             <C>                <C>
Jill Krumme Burns ................................         0            37,261                  0
Chris L. Condley(1)...............................         0            35,058                  0
Diane Krumme Cox .................................         0            37,261                  0
Marilyn Dougall ..................................         0            16,170                  0
Pam L. Ford (2)...................................         0             3,343                  0
Edwin L. or Elaine Gage(3)........................         0            65,621                  0
Paul Glover ......................................         0            20,777                  0
Christopher R. Guthery ...........................         0             2,204                  0
David Barclay Guthery ............................         0             2,204                  0
David or Jeannie Guthery .........................         0            83,851                  0
Carolyn A. Krumme ................................         0            16,341                  0
Catherine Krumme .................................         0            21,922                  0
Cynthia A. Krumme ................................         0             8,443                  0
David W. Krumme ..................................         0            39,922                  0
George W. Krumme .................................     1,068            34,971              1,068
J.B. Krumme Family Trust .........................         0            48,479                  0
Matthew Krumme ...................................         0            21,922                  0
Molly Krumme .....................................         0             2,662                  0
R. H. Krumme .....................................         0           112,383                  0
Robert B. Krumme .................................         0            88,115                  0
Robert B., as Custodian for John P.A. ............
  Krumme .........................................         0            16,341                  0
Virginia F. Krumme ...............................         0            28,618                  0
Courtney Lamont ..................................         0            35,172                  0
Courtney Lamont Irrevocable Trust ................         0            21,464                  0
Abbie Leonard ....................................         0             1,431                  0
Amy Leonard ......................................         0            35,172                  0
Amy Leonard Irrevocable Trust ....................         0            21,464                  0
Austin Leonard Irrevocable Trust .................         0             1,431                  0
Carlene C. Leonard Trust .........................         0            25,070                  0
Cecil Elleen Leonard Revocable Trust .............         0            48,651                  0
Eric Leonard .....................................         0             1,431                  0
Kevin Leonard Irrevocable Trust ..................         0             1,431                  0
Harry E. Leonard Trust ...........................         0            25,070                  0
Harry E. Leonard, Jr(4)...........................         2            68,912                  2
Michael Stephens Leonard Revocable Trust(5).......         0           166,354                  0
Robert E. List ...................................         0            68,397                  0
Victor R. McMillen ...............................         0            16,141                  0
V. David Miller ..................................         0            80,560                  0
C.R. Morris ......................................         0            28,618                  0
David W. Morris ..................................         0             5,724                  0
Gil L. Morris ....................................         0             5,724                  0
Grant J. Morris ..................................         0             5,724                  0
Jennie D. Morris for the Benefit of Alexis R
Morris ...........................................         0             8,242                  0
Jennie D. Morris for the Benefit of Zachary R
Morris ...........................................         0             8,242                  0
W.L. Morris(6)....................................         0           123,086                  0
Margaret  Pickett ................................         0            48,479                  0
Sally D. Prince ..................................         0            16,170                  0
John A. Schilt(7).................................         0               430                  0
Glen S. Scott ....................................         0               430                  0
Bob Smith ........................................         0           336,889                  0
Michael G. Smith .................................         0            28,618                  0
J. Steve Thompson(7)..............................         0               430                  0
J. Walker Trust, QTIP ............................         0            14,309                  0
J. Walker Trust ..................................         0            37,204                  0
Mike Webb ........................................         0            76,324                  0
Vicky Wilcoxen ...................................         0               430                  0
David W. Wood ....................................         0             7,155                  0
Robert N. Yaffe(8)................................     4,428           257,561              4,428
</TABLE>


                                     - 37 -
<PAGE>   41
(1) Senior Executive Vice President and Director of our subsidiary, First
    National Bank and Trust Company of Muskogee.

(2) Executive Vice President, Chief Financial Officer and Advisory Director of
    our subsidiary, First National Bank and Trust Company of Muskogee.

(3) Edwin L. Gage serves as a Director of our subsidiary, First National Bank
    and Trust Company of Muskogee.

(4) President and Director of our subsidiary, First Muskogee Insurance Corp.;
    Chairman of the Board of our subsidiary, First National Bank and Trust
    Company of Muskogee.

(5) Vice-President and Director of our subsidiary, First Muskogee Insurance
    Corp.; President and Chief Executive Officer of our subsidiary, First
    National Bank and Trust Company of Muskogee.

(6) Vice President of our subsidiary, Bank of Oklahoma, National Association.

(7) Director of our subsidiaries, First National Bank and Trust Company of
    Muskogee and First Muskogee Insurance Corp.

(8) Director of our subsidiary, First National Bank and Trust Company of
    Muskogee.



                                     - 38 -
<PAGE>   42

                          DESCRIPTION OF CAPITAL STOCK

    The following descriptions of our capital stock are not complete. You should
also read our Amended and Restated Certificate of Incorporation, our Bylaws and
the General Corporation Act of the State of Oklahoma. We have filed copies of
our Certificate of Incorporation and Bylaws with the SEC. These documents are
incorporated by reference into the registration statement of which this
prospectus is a part.

    We have 3,500,000,000 shares of capital stock authorized, of which
2,500,000,000 shares are common stock, $0.00006 par value, and 1,000,000,000
shares are preferred stock, $0.00005 par value. As of June 25, 1999, we had
47,553,759 shares of common stock issued and outstanding and 250,000,000
shares of preferred stock issued and outstanding as a single series of Series A
Preferred Stock.

COMMON STOCK

    Each holder of shares 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 our liquidation or dissolution, the holders of our common stock
will be entitled to share ratably in our assets that are legally available for
distribution to shareholders after payment of liabilities. Holders of
outstanding Series A Preferred Stock are entitled to dividend and/or liquidation
preferences. Holders of other series of preferred stock may likewise be entitled
to dividend and 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, holders of our common stock do not have cumulative voting rights. We
cannot further call or assess shares of our common stock.

SERIES A PREFERRED STOCK

    The Series A Preferred Stock has no voting rights under the Certificate of
Incorporation and under Oklahoma corporate law would only have the right to vote
in the event of a proposed amendment to the Certificate of Incorporation
altering or changing the special rights and preferences of the Series A
Preferred Stock, changing the par value or increasing or decreasing the number
of authorized shares.

    The holders of outstanding shares of our Series A Preferred Stock are
entitled to receive cumulative cash dividends at the annual rate of ten percent
of the $0.06 liquidation preference value per share, when and as declared by our
Board of Directors. Any shares of Series A Preferred Stock may be redeemed by us
at any time, provided that all regulatory requirements are met and all accrued
dividends are paid. Holders of our Series A Preferred Stock may convert their
shares to our common stock at any time at a ratio of 2.39 shares of common stock
for each 100 shares of Series A Preferred Stock. This ratio has been adjusted to
account for the two for one stock split which was issued February 22, 1999 and
also gives effect to the 1 for 100 reverse stock split of common stock effected
December 17, 1991 and the November 18, 1993, November 17, 1994, November 27,
1995, November 27, 1996, November 19, 1997 and November 25, 1998 BOKF 3% common
stock dividends payable by the issuance of our common stock. Holders of our
preferred stock have no sinking fund or preemptive rights.

PREFERRED STOCK

    Our Board of Directors has the authority to determine and alter the rights,
preferences, privileges and restrictions granted to or imposed upon any 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 those holders as provided by the General Business Corporation Act of
the State of Oklahoma.

    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.

    If applicable, the terms on which our preferred stock may be convertible
into or exchangeable for our common stock or our other securities will be
described in the applicable Certificate of Determination. The terms will include
provisions as to whether conversion or exchange is



                                     - 39 -
<PAGE>   43

mandatory, at the option of the holder, or at our option, 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.

DIRECTORS' LIABILITY

    Article VI of our Bylaws provide for indemnification of directors to the
fullest extent authorized by Oklahoma Law. Section 1031 of the Oklahoma General
Business Corporation Act Authorizes a corporation to indemnify its officers,
employees and agents against expenses, including attorneys' fees, judgments,
fines, and amounts paid in settlement actually and reasonably incurred, whether
in civil, criminal, administrative, or investigative proceedings, by him or her
in a manner he or she reasonably believed to be in or not opposed to the best
interests of the corporation, and, with respect to any criminal action or
proceeding, had no reasonable cause to believe his or her conduct was unlawful.
Pursuant to statutory and bylaw provisions, we have purchased insurance against
certain costs of indemnification of its officers and directors.

TRANSFER AGENT AND REGISTRAR

    The Bank of New York acts as transfer agent and registrar for our common
stock and our Series A Preferred Stock.



                                     - 40 -
<PAGE>   44

                              PLAN OF DISTRIBUTION

    The selling shareholders or their respective pledgees, donees, transferees
or other successors in interest may, from time to time, sell all or a portion of
the shares on the Nasdaq National Market, in privately negotiated transactions
or otherwise. Shares may be sold at fixed prices that may be changed, at market
prices prevailing at the time of sale, at prices related to such market prices
or negotiated prices. The shares may be sold by the selling shareholders by one
or more of the following methods:

    o  block trades in which the broker or dealer so engaged will attempt to
       sell the shares as agent but may position and resell a portion of the
       block as principal to facilitate the transaction;

    o  purchases by a broker or dealer as principal and resale by such broker or
       dealer for its account pursuant to this prospectus;

    o  ordinary brokerage transactions and transactions in which the broker
       solicits purchasers;

    o  privately negotiated transactions;

    o  short sales;

    o  through the writing of options on the shares; and

    o  a combination of any such methods of sale.

    In effecting sales, brokers and dealers engaged by the selling shareholders
may arrange for other brokers or dealers to participate. Broker-dealers may
agree with the selling shareholders to sell a specified number of such shares at
a stipulated price per share. To the extent that such broker-dealer is unable to
do so in acting as agent for a selling shareholder, it may agree to purchase as
principal any unsold shares at the stipulated price. Broker-dealers who acquire
shares as principals may thereafter resell such shares from time to time in
transactions in the Nasdaq National market at prices and on terms then
prevailing at time of sale, at prices related to the then-current market price
or in negotiated transactions. Broker-dealers may use block transactions and
sales to and through broker-dealers, including transactions of the nature
described above.

    From time to time, one or more of the selling shareholders may pledge,
hypothecate or grant a security interest in some of all of the shares owned by
them. The pledges, secured parties or persons to whom such securities have been
hypothecated will, upon foreclosure in the event of default, be deemed to be
selling shareholders. The number of selling shareholder's shares offered under
this prospectus will decrease as and when it takes such actions. The plan of
distribution for such selling shareholder's shares will otherwise remain
unchanged. In addition, a selling shareholder may, from time to time, sell short
our common stock and in such instances, this prospectus may be delivered in
connection with such short sales and the shares offered under this prospectus
may be used to cover such short sales.

    To the extent required under the Securities Act the aggregate amount of
selling shareholders' shares of our common stock being offered and the terms of
the offering, the names of any such agents, brokers, dealers or underwriters and
any applicable commission with respect to a particular offer will be set forth
in a accompanying prospectus supplement. Any underwriters, dealers, brokers or
agents participating in the distribution of our common stock may receive
compensation in the form of underwriting discounts, concessions, commissions or
fees from a selling shareholder and/or purchasers of selling shareholders'
shares of common stock, for whom they may act (which compensation to a
particular broker-dealer might be in excess of customary commissions).

    The selling shareholders and any broker-dealers or agents that participate
with the selling shareholders in the sales of the shares may be deemed to be
"underwriters" within the meaning of the Securities Act in connection with such
sales. In such event, any commission received by such broker-dealers or agents
and any profit on the resale of the shares purchased by them may be deemed to be
an underwriting commission or discount under the Securities Act.

    A selling shareholder may enter into hedging transactions with
broker-dealers and the broker-dealers may engage in short sales of the common
stock in the course of hedging the positions they assume with such selling
shareholder, including any connection with distributions of the common stock by
such broker-dealers. A selling shareholder may enter into option or other
transactions with broker-dealers that involve the delivery of the shares offered
hereby to the broker-dealers, who may then resell or otherwise transfer such
shares. A selling shareholder may also loan or pledge the shares offered hereby
to the broker-dealer and the broker-dealer may sell the shares hereby so loaned
or upon a default may sell or otherwise transfer the pledged shares offered
hereby.



                                     - 41 -
<PAGE>   45

    The selling shareholders and any other persons participating in the sale or
distribution of the shares will be subject to applicable provisions of the
Securities Exchange Act and the rules and the regulations thereunder, which
provisions may limit the timing of purchases and sales of any of the sales by
selling shareholders or any other such person. The foregoing may affect the
marketability of the shares.

    In order to comply with securities laws of certain states, if applicable,
the shares offered by this prospectus may be sold in such jurisdictions only
through registered or licensed brokers or dealers. In addition, in certain
states the shares may not be sold unless they have been registered or qualified
for sale or an exemption from the registration or qualification requirements is
available and is complied with.

    We will make copies of this prospectus available to the selling shareholders
and have informed the selling shareholders that they must deliver a copy of this
prospectus to each purchaser of the shares prior to or at the time of any sale.
We have agreed with the selling shareholders to keep this prospectus effective
until the earlier of (i) the sale of all of the shares or (ii)
June 30, 2001.

                                  LEGAL MATTERS

    The validity of the shares of common stock in respect of which this
prospectus is being delivered will be passed on for us by Frederic Dorwart,
Lawyers, Tulsa, Oklahoma.

                                     EXPERTS

    Ernst & Young LLP, independent auditors, have audited our consolidated
financial statements included in our Annual Report on Form 10-K for the years
ended December 31, 1998, 1997, and 1996, as set forth in their report, which is
incorporated by reference. Our financial statements are incorporated by
reference, as well as included, in reliance on Ernst & Young LLP's report, given
on their authority as experts in accounting and auditing.

                       WHERE YOU CAN FIND MORE INFORMATION

    We file reports, proxy statements, and other information with the SEC. You
may read and copy these reports, proxy statements, and other information
concerning us 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 ourselves. Our common stock is quoted on the Nasdaq National Market.
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 that we filed with the
SEC. You can obtain the full registration statement from the SEC as indicated
above, or from us.

    The SEC allows us 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 that we file with the SEC 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:

    o  Annual Report on Form 10-K for the year ended December 31, 1998.

    o  Quarterly Report on Form 10-Q for the three months ended March 31, 1999.

    We also incorporate by reference any future filings made with the SEC
pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange Act until we file
a post-effective amendment that 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.
Requests should be directed to Chief Financial Officer, BOK Financial
Corporation, Bank of Oklahoma Tower, Boston Avenue at Second Street, Tulsa,
Oklahoma 74172, (telephone number 918-588-6717) ([email protected]).



                                     - 42 -
<PAGE>   46
                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

    The following are the estimated expenses to be incurred by BOK Financial
Corporation in connection with the Offer described in this Registration
Statement:


<TABLE>
<S>                                          <C>
SEC registration fee....................     $ 16,649
Printing and engraving expense..........        6,500
Fees and expenses of transfer agent.....        1,000
Accounting fees and expenses............       10,000
Legal fees and expenses.................       35,000
Miscellaneous...........................        5,000
                                             --------
          Total ........................     $ 74,149
                                             ========
</TABLE>

    BOK Financial Corporation will bear all costs relating to the registration
of the shares as related to the selling shareholders. The selling shareholders
shall pay all legal fees and underwriting discounts related to subsequent
offerings.

ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS

    The Oklahoma Business Corporation Act and Article VI of the Bylaws of BOK
Financial Corporation provide BOK Financial Corporation with broad powers and
authority to indemnify its directors and officers and to purchase and maintain
insurance for such purposes. Pursuant to such statutory and Bylaw provisions,
BOK Financial Corporation has purchased insurance against certain costs of
indemnification of its officers and directors.

ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

    (a) Exhibits.

<TABLE>
<CAPTION>
EXHIBIT NUMBER                   DESCRIPTION OF EXHIBITS
- --------------                   -----------------------
<S>                <C>

    3           --  The Certificate of Incorporation of BOK Financial
                    Corporation, incorporated by reference to (i) Amended and
                    Restated Certificate of Incorporation of BOK Financial
                    Corporation filed with the Oklahoma Secretary of State on
                    May 28, 1991, filed as Exhibit 3.0 to S-1 Registration
                    Statement No. 33-90450, and (ii) Amendment attached as
                    Exhibit A to Information Statement and prospectus supplement
                    filed November 20, 1991.

    3.1         --  Bylaws of BOK Financial Corporation, incorporated by
                    reference to Exhibit 3.1 of S-1 Registration Statement No.
                    33-90450.

    4           --  The rights of the holders of the Common Stock and Preferred
                    Stock of BOK Financial Corporation are set forth in its
                    Certificate of Incorporation.

    5*          --  Opinion of Frederic Dorwart, Lawyers

    23*         --  Consent of Independent Auditors--Ernst & Young LLP.

    24          --  Power of Attorney (contained on page II-7)

    27          --  Financial Data Schedule for ended December 31, 1998,
                    incorporated by reference to Exhibit 27.0 of Form 10-K for
                    the fiscal year ended December 31, 1998.

    27.1        --  Restated Financial Data Schedule, incorporated by
                    reference to Exhibit 27.1 of Form 10-Q for the fiscal
                    quarter ended March 31, 1999.
</TABLE>


<PAGE>   47

<TABLE>
<S>              <C>
    99           -- Additional Exhibits.

    99.1         -- Undertakings incorporated by reference into S-8
                    Registration Statement No. 33-44121 for Bank of Oklahoma
                    Master Thrift Plan and Trust, incorporated by reference to
                    Exhibit 99.1 of Form 10-K for the fiscal year ended
                    December 31, 1993.

    99.2         -- Undertakings incorporated by reference into S-8
                    Registration Statement No. 33-44122 for BOK Financial
                    Corporation 1991 Special Stock Option Plan, incorporated by
                    reference to Exhibit 99.2 of Form 10-K for the fiscal year
                    ended December 31, 1993.

    99.3         -- Undertakings incorporated by reference into S-8
                    Registration Statement No. 33-55312 for BOK Financial
                    Corporation 1992 Stock Option Plan, incorporated by
                    reference to Exhibit 99.3 of Form 10-K for the fiscal year
                    ended December 31, 1993.

    99.4         -- Undertakings incorporated by reference into S-8
                    Registration Statement No. 33-70102 for BOK Financial
                    Corporation 1993 Stock Option Plan, incorporated by
                    reference to Exhibit 99.4 of Form 10-K for the fiscal year
                    ended December 31, 1993.

    99.5         -- Undertakings incorporated by reference into S-8
                    Registration Statement No. 33-79834 for BOK Financial
                    Corporation 1994 Stock Option Plan, incorporated by
                    reference to Exhibit 99.5 of Form 10-K for the fiscal year
                    ended December 31, 1994.

    99.6         -- Undertakings incorporated by reference into S-8
                    Registration Statement No. 33-79836 for BOK Financial
                    Corporation Directors' Stock Compensation Plan,
                    incorporated by reference to Exhibit 99.6 of Form 10-K for
                    the fiscal year ended December 31, 1994.

    99.7         -- Undertakings incorporated by reference into S-8
                    Registration Statement No. 33-32642 for BOK Financial
                    Corporation 1997 Stock Option Plan, Incorporated by
                    reference to Exhibit 99.7 of Form 10-K for the fiscal year
                    ended December 31, 1997.
</TABLE>

- ----------
    *  Filed herewith.

    (b) Financial Statement Schedules.

    All schedules either are not applicable or the information required thereby
is included in the financial statements or notes thereto.

ITEM 17. UNDERTAKINGS.

    (a) The undersigned registrant hereby undertakes:

        (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 the 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 and of the
          estimated maximum offering range



                                      II-2
<PAGE>   48


          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 20% 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 (a)(1)(I) and (a)(1)(ii) do not
          apply if 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 registrant pursuant to
          Section 13 or Section 15(d) of the Securities Exchange Act of 1934
          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.

    (b)   The undersigned registrant hereby undertakes that, for purposes of
          determining any liability under the Securities Act of 1933, each
          filing of the registrant's annual report pursuant to Section 13(a) or
          Section 15(d) of the Securities Exchange Act of 1934 that is
          incorporated by reference in the registration statement 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.

    (c)   Insofar as indemnification for liabilities arising under the
          Securities Act of 1933 may be permitted to directors, officers and
          controlling persons of the registrant pursuant to the foregoing
          provisions, or otherwise, the registrant has been advised that in the
          opinion of the Commission 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 the registrant of expenses incurred or paid
          by a director, officer or controlling person of the registrant 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, the registrant 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
          of 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>   49

                                   SIGNATURES

    Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Registration Statement or Amendment to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of Tulsa,
State of Oklahoma, on June 29, 1999.

BOK FINANCIAL CORPORATION

By: /s/ STANLEY A. LYBARGER
    --------------------------------------------
                 Stanley A. Lybarger
       President and Chief Executive Officer

    Pursuant to the requirements of the Securities Act of 1933, as amended,
this Amendment to the Registration Statement has been signed below by the
following persons in the capacities and on the date indicated.


<TABLE>
<CAPTION>
               SIGNATURE                              Title               Date
               ---------                              -----               ----
<S>                                       <C>                             <C>
 /s/ GEORGE B. KAISER                     Chairman of the Board of BOK    6/29/99
- -------------------------------             Financial Corporation
George B. Kaiser

/s/ STANLEY A. LYBARGER                   President, Chief Executive      6/29/99
- -------------------------------             Officer,-and Director of
Stanley A. Lybarger                         BOK Financial Corporation

/s/ JAMES A. WHITE                        Executive Vice President and    6/29/99
- -------------------------------             Chief-Financial Officer of
James A. White                              BOK Financial Corporation

/s/ JOHN C. MORROW                        Senior Vice President and       6/29/99
- -------------------------------             Director-of Financial
John C. Morrow                              Accounting and Reporting
                                            of BOK Financial
                                            Corporation

/s/ STEVEN E. NELL                        Senior Vice President and       6/29/99
- -------------------------------             Corporate Controller of
Steven E. Nell                              BOK Financial Corporation

/s/ W. WAYNE ALLEN                        Director of BOK Financial       6/29/99
- -------------------------------             Corporation
W. Wayne Allen

                                          Director of BOK Financial
- -------------------------------             Corporation
James E. Barnes


/s/ SHARON J. BELL                        Director of BOK Financial       6/29/99
- -------------------------------             Corporation
Sharon J. Bell

/s/ C. FRED BALL, JR.                     Director of BOK Financial       6/29/99
- -------------------------------             Corporation
C. Fred Ball, Jr.

                                          Director of BOK Financial
- -------------------------------             Corporation
Luke R. Corbett
</TABLE>


                                      II-4

<PAGE>   50



<TABLE>
<S>                                       <C>
/s/ ROBERT H. DONALDSON                   Director of BOK Financial       6/29/99
- -------------------------------             Corporation
Robert H. Donaldson

                                          Director of BOK Financial       6/29/99
- -------------------------------             Corporation
William E. Durrett

/s/ JAMES O. GOODWIN                      Director of BOK Financial       6/29/99
- -------------------------------             Corporation
James O. Goodwin

/s/ V. BURNS HARGIS                       Vice Chairman and Director      6/29/99
- -------------------------------             of-BOK-Financial
V. Burns Hargis                             Corporation

/s/ HOWARD E. JANZEN                      Director of BOK Financial       6/29/99
- -------------------------------             Corporation
Howard E. Janzen

                                          Director of BOK Financial
- -------------------------------             Corporation
E. Carey Joullian, IV

/s/ ROBERT J. LAFORTUNE                   Director of BOK Financial       6/29/99
- -------------------------------             Corporation
Robert J. LaFortune

/s/ PHILIP C. LAUINGER, JR.               Director of BOK Financial       6/29/99
- -------------------------------             Corporation
Philip C. Lauinger, Jr.

/s/ FRANK A. MCPHERSON                    Director of BOK Financial       6/29/99
- -------------------------------             Corporation
Frank A. McPherson

                                          Director of BOK Financial
- -------------------------------             Corporation
Steven E. Moore

                                          Director of BOK Financial
- -------------------------------             Corporation
J. Larry Nichols

/s/ RONALD J. NORICK                      Director of BOK Financial       6/29/99
- -------------------------------             Corporation
Ronald J. Norick

                                          Director of BOK Financial
- -------------------------------             Corporation
Robert L. Parker, Sr.

                                          Director of BOK Financial
- -------------------------------             Corporation
James W. Pielsticker
</TABLE>



                                      II-5

<PAGE>   51

<TABLE>
<S>                                       <C>
/s/ E. C. RICHARDS                        Director of BOK Financial       6/29/99
- -------------------------------             Corporation
E.C. Richards

                                          Director of BOK Financial
- -------------------------------             Corporation
James A. Robinson

                                          Director of BOK Financial
- -------------------------------             Corporation
L. Francis Rooney, III

                                          Director of BOK Financial
- -------------------------------             Corporation
David J. Tippeconnic

/s/ TOM E. TURNER                         Director of BOK Financial       6/29/99
- -------------------------------             Corporation
Tom E. Turner

                                          Director of BOK Financial
- -------------------------------             Corporation
Robert L. Zemanek
</TABLE>


                                      II-6
<PAGE>   52


                                POWER OF ATTORNEY

    Each person whose signature appears below hereby authorizes George B.
Kaiser and James A. White, or either of them, to file one or more amendments
(including post-effective amendments which may be held pursuant to Rule 462(b)
under the Securities Act of 1933) to Registration Statement number , which
amendments may make such changes in the Registration Statement as Mr. Kaiser or
Mr. White deems appropriate, and each such person hereby appoints George B.
Kaiser and James A. White, or either of them, as attorney-in-fact to execute in
the name and on behalf of each person individually, and in each capacity stated
below, any such amendment to the Registration Statement.


<TABLE>
<CAPTION>
               SIGNATURE                              TITLE               DATE
               ---------                              -----               ----
<S>                                       <C>                             <C>
/s/ GEORGE B. KAISER                      Chairman of the Board of BOK    6/29/99
- -------------------------------             Financial Corporation
               George B. Kaiser

/S/ STANLEY A. LYBARGER                   President, Chief Executive      6/29/99
- -------------------------------             Officer,-and Director of
            Stanley A. Lybarger             BOK Financial Corporation

/s/ JAMES A. WHITE                        Executive Vice President and    6/29/99
- -------------------------------             Chief-Financial Officer of
                 James A. White             BOK Financial Corporation

/S/ JOHN C. MORROW                        Senior Vice President and       6/29/99
- -------------------------------             Director-of Financial
                 John C. Morrow             Accounting and Reporting
                                            of BOK Financial
                                            Corporation

/S/ STEVEN E. NELL                        Senior Vice President and       6/29/99
- -------------------------------             Corporate Controller of
                 Steven E. Nell             BOK Financial Corporation

/s/ W. WAYNE ALLEN                        Director of BOK Financial       6/29/99
- -------------------------------             Corporation
                 W. Wayne Allen

                                          Director of BOK Financial
- -------------------------------             Corporation
               James E. Barnes

/s/ SHARON J. BELL                        Director of BOK Financial       6/29/99
- -------------------------------             Corporation
                 Sharon J. Bell

/s/ C. FRED BALL, JR.                     Director of BOK Financial       6/29/99
- -------------------------------             Corporation, President and
              C. Fred Ball, Jr.             Chief Executive Officer,
                                            Bank of Texas

                                          Director of BOK Financial       6/29/99
- -------------------------------             Corporation
                Luke R. Corbett

/s/ ROBERT H. DONALDSON                   Director of BOK Financial       6/29/99
- -------------------------------             Corporation
            Robert H. Donaldson
</TABLE>


                                      II-7
<PAGE>   53



<TABLE>
<S>                                       <C>
                                          Director of BOK Financial
- -------------------------------             Corporation
             William E. Durrett

/s/ JAMES O. GOODWIN                      Director of BOK Financial       6/29/99
- -------------------------------             Corporation
               James O. Goodwin

/s/ V. BURNS HARGIS                       Vice Chairman and Director      6/29/99
- -------------------------------             of-BOK-Financial
                V. Burns Hargis             Corporation

/s/ HOWARD E. JANZEN                      Director of BOK Financial       6/29/99
- -------------------------------             Corporation
               Howard E. Janzen

                                          Director of BOK Financial
- -------------------------------             Corporation
          E. Carey Joullian, IV

/s/ ROBERT J. LAFORTUNE                   Director of BOK Financial       6/29/99
- -------------------------------             Corporation
            Robert J. LaFortune

/s/ PHILLIP C. LAUINGER, JR.             Director of BOK Financial        6/29/99
- -------------------------------             Corporation
         Philip C. Lauinger, Jr

/s/ FRANK A. MCPHERSON                  Director of BOK Financial         6/29/99
- -------------------------------             Corporation
            Frank A. McPherson

                                          Director of BOK Financial
- -------------------------------             Corporation
                Steven E. Moore

                                          Director of BOK Financial
- -------------------------------             Corporation
               J. Larry Nichols

/s/ RONALD J. NORICK                      Director of BOK Financial       6/29/99
- -------------------------------             Corporation
               Ronald J. Norick

                                          Director of BOK Financial
- -------------------------------             Corporation
          Robert L. Parker, Sr.

                                          Director of BOK Financial
- -------------------------------             Corporation
           James W. Pielsticker

/s/ E. C. RICHARDS                        Director of BOK Financial       6/29/99
- -------------------------------             Corporation
                  E.C. Richards

                                          Director of BOK Financial
- -------------------------------             Corporation
              James A. Robinson
</TABLE>



                                      II-8
<PAGE>   54


<TABLE>
<S>                                       <C>
                                          Director of BOK Financial
- -------------------------------             Corporation
        L. Francis Rooney, III

                                          Director of BOK Financial
- -------------------------------             Corporation
           David J. Tippeconnic

/s/ TOM E. TURNER                         Director of BOK Financial      6/29/99
- -------------------------------             Corporation
                  Tom E. Turner

                                          Director of BOK Financial
- -------------------------------             Corporation
              Robert L. Zemanek
</TABLE>



                                      II-9
<PAGE>   55



                                INDEX TO EXHIBITS

<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER                    DESCRIPTION OF EXHIBITS
- ---------                   -----------------------
<S>            <C>
    5          --   Opinion of Frederic Dorwart, Lawyers

   23          --   Consent of Independent Auditors--Ernst & Young LLP
</TABLE>

<PAGE>   1
                                                                     EXHIBIT 5


Opinion of Frederic Dorwart, Lawyers



                                  July 2, 1999



BOK Financial Corporation
Bank of Oklahoma Tower
Boston Avenue at Second Street
Tulsa, Oklahoma  74172

         RE:  REGISTRATION STATEMENT ON FORM S-3

Ladies and Gentlemen:

         We have examined the Registration Statement on Form S-3 to be filed by
you with the Securities and Exchange Commission in connection with the
registration under the Securities Act of 1933, as amended, of 2,371,809 shares
of your common stock to be offered for the sale for the benefit of certain
selling shareholders. The shares are to be sold from time to time by the selling
shareholders as described in the Registration Statement. As your counsel in
connection with these transactions, we have examined the proceedings taken and
proposed to be taken in connection with the issue in sale of the shares.

         It is our opinion that the shares, when issued as described in the
Registration Statement, will be legally and validly issued, fully paid, and
non-assessable.

         We consent to the use of this opinion as an exhibit to the
Registration Statement, including the prospectus constituting a part thereof
and any amendment thereto.

                                   Sincerely,


                              /s/ FREDERIC DORWART

                                Frederic Dorwart




<PAGE>   1
                                                                      EXHIBIT 23


                        CONSENT OF INDEPENDENT AUDITORS


We consent to the reference to our firm under the caption "Experts" in the
Registration Statement Form S-3 No. 333-________ and related Prospectus of BOK
Financial Corporation for the registration of 2,371,809 shares of its common
stock and to the incorporation by reference therein of our report dated
January 26, 1999, with respect to the consolidated financial statements of BOK
Financial Corporation included in its Annual Report (Form 10-K) for the year
ended December 31, 1998, filed with the Securities and Exchange Commission.


                                                    /s/ ERNST & YOUNG LLP


Tulsa, Oklahoma
July 2, 1999



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