MARSHALL & ILSLEY CORP/WI/
10-K, 1999-03-10
NATIONAL COMMERCIAL BANKS
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549
 
                               ----------------
 
                                   FORM 10-K
 
                               ----------------
 
[X] ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIESEXCHANGE
  ACT OF 1934
 
                  For the fiscal year ended December 31, 1998
 
                                      OR
 
[_] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
  EXCHANGE ACT OF 1934
 
                          Commission File No. 0-1220
 
                         MARSHALL & ILSLEY CORPORATION
            (Exact name of registrant as specified in its charter)
 
               Wisconsin                             39-0968604
    (State or other jurisdiction of               (I.R.S. Employer
    incorporation or organization)               Identification No.)
 
        770 North Water Street
         Milwaukee, Wisconsin                           53202
    (Address of principal executive                  (Zip Code)
               offices)
 
Registrant's telephone number, including area code: (414) 765-7801
 
  Securities registered pursuant to Section 12(b) of the Act: None
  Securities registered pursuant to Section 12(g) of the Act:
 
                         Common Stock--$1.00 par value
                               (Title of Class)
 
  Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to
such filing requirements for the past 90 days. Yes X  No
 
  Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to
the best of registrant's knowledge, in definitive proxy or information
statements incorporated by reference in Part III of this Form 10-K or any
amendment to this Form 10-K. [_]
 
  The aggregate market value of the voting stock held by nonaffiliates of the
registrant is $6,286,077,000 as of January 29, 1999. The number of shares of
common stock outstanding as of January 29, 1999 is 106,094,123.
 
                      DOCUMENTS INCORPORATED BY REFERENCE
 
  Part III incorporates information by reference from the Proxy Statement for
the registrant's Annual Meeting of Shareholders to be held on April 27, 1999.
<PAGE>
 
                                    PART I
 
ITEM 1. BUSINESS
 
                                    General
 
  Marshall & Ilsley Corporation ("M&I" or the "Corporation"), incorporated in
Wisconsin in 1959, is a registered bank holding company under the Bank Holding
Company Act of 1956 (the "BHCA"). As of December 31, 1998, M&I had
consolidated total assets of approximately $21.6 billion and consolidated
total deposits of approximately $15.9 billion, making M&I the second largest
bank holding company headquartered in Wisconsin. The executive offices of M&I
are located at 770 North Water Street, Milwaukee, Wisconsin 53202 (telephone
number (414) 765-7801).
 
  M&I's principal assets are the stock of its bank and nonbank subsidiaries
and the assets of its Data Services Division ("M&I Data Services"). M&I's
subsidiaries include 27 commercial banks, one federal savings bank and a
number of companies engaged in businesses that the Federal Reserve Board (the
"FRB") has determined to be closely-related or incidental to the business of
banking. M&I provides its subsidiaries with financial and managerial
assistance in such areas as budgeting, tax planning, compliance assistance,
asset and liability management, investment administration and portfolio
planning, business development, advertising and human resources management.
 
  M&I's bank and savings association subsidiaries provide a full range of
banking services to individuals, businesses and governments throughout
Wisconsin, and in the Phoenix, Arizona metropolitan area, and the northern
Chicago, Illinois suburbs. These subsidiaries offer retail, institutional,
international, business and correspondent banking, investment and trust
services through the operation of over 230 banking offices in Wisconsin, 13
offices in Arizona and 6 offices in Illinois. The M&I bank and saving
association subsidiaries hold a significant portion of their mortgage and
investment portfolios indirectly through their ownership interest in direct
and indirect subsidiaries. M&I Marshall & Ilsley Bank ("M&I Bank") is M&I's
largest bank subsidiary, with consolidated assets as of December 31, 1998 of
approximately $9.4 billion.
 
  M&I Data Services and three nonbank subsidiaries are major suppliers of
financial and data processing services and software to banking, financial and
related organizations. M&I Data Services provides services and software to
over 650 financial institution customers in the United States, as well as
institutions in numerous foreign countries. M&I's nonbank subsidiaries operate
a variety of bank-related businesses, including those providing investment
management services, insurance services, trust services, equipment lease
financing, commercial and residential mortgage banking, home equity financing,
venture capital, brokerage services and financial advisory services. M&I
Investment Management Corp. offers a full range of asset management services
to M&I's trust company subsidiaries, the Marshall Funds and other individual,
business and institutional customers. M&I's trust company subsidiaries provide
trust and employee benefit plan services to customers in Wisconsin, Arizona
and Florida. M&I First National Leasing Corp. and M&I Leasing Corp. of
Michigan lease a variety of equipment and machinery to large and small
businesses. M&I Dealer Finance, Inc. provides lease financing. M&I Mortgage
Corp. originates, purchases, sells and services residential mortgages. M&I
Home Equity Corp. and M&I Home Equity Corp. of Minnesota provide consumer home
equity loans. The Richter-Schroeder Company originates and services long-term
commercial real estate loans for institutional investors. M&I Capital Markets
Group L.L.C. provides venture capital, financial advisory and strategic
planning services to customers, including assistance in connection with the
private placement of securities, raising funds for expansion, leveraged buy-
outs, divestitures, mergers and acquisitions and small business investment
company transactions. M&I Brokerage Services, Inc., a broker-dealer registered
with the National Association of Securities Dealers and the Securities and
Exchange Commission, provides brokerage and other investment related services
to a variety of retail and commercial customers.
 
  On April 1, 1998, M&I acquired Advantage Bancorp, Inc., a Wisconsin
corporation ("Advantage") and Advantage's federal savings bank affiliate for
3,981,152 shares of M&I Common Stock. The acquisition contributed
approximately $0.5 billion of loans and $0.7 billion of deposits. The
transaction was accounted for as a pooling-of-interests.
 
                                       1
<PAGE>
 
                         Principal Sources of Revenue
 
  The table below shows the amount and percentages of M&I's total consolidated
operating revenues resulting from interest on loans and leases, interest on
investment securities and fees for data processing services for each of the
last three years ($ in thousands):
 
<TABLE>
<CAPTION>
                                                 Interest on       Fees for Data
                          Interest on Loans       Investment         Processing
                              and Leases          Securities          Services
                         -------------------- ------------------ ------------------
                                     Percent            Percent            Percent
                                    of Total           of Total           of Total    Total
                                    Operating          Operating          Operating Operating
Year Ended December 31     Amount   Revenues   Amount  Revenues   Amount  Revenues   Revenues
- ----------------------   ---------- --------- -------- --------- -------- --------- ----------
<S>                      <C>        <C>       <C>      <C>       <C>      <C>       <C>
1998.................... $1,085,829   49.6%   $346,012   15.8%   $412,632   18.8%   $2,190,377
1997....................    921,161   50.4     297,156   16.2     343,846   18.8     1,828,802
1996....................    804,951   51.7     239,668   15.4     268,526   17.2     1,557,095
</TABLE>
 
  M&I business segment information is contained in Note 19 of the Notes to the
Consolidated Financial Statements contained in Item 8, Consolidated Financial
Statements and Supplementary Data.
 
                                  Competition
 
  M&I and its subsidiaries face substantial competition from hundreds of
competitors in the markets they serve, some of which are larger and have
greater resources than M&I. M&I's bank subsidiaries compete for deposits and
other sources of funds and for credit relationships with other banks, savings
associations, credit unions, finance companies, mutual funds, life insurance
companies (and other long-term lenders) and other financial and non-financial
companies located both within and outside M&I's primary market area, many of
which offer products functionally equivalent to bank products. M&I's non-bank
operations compete with numerous banks, finance companies, data servicing
companies, leasing companies, mortgage bankers, brokerage firms, financial
advisors, trust companies, mutual funds and investment bankers in Wisconsin
and throughout the United States.
 
  The market for the banking technology services offered by M&I Data Services
is national in scope. In any given geographic area, M&I Data Services'
competitors vary in size and include national, regional and local operations.
While historically the bank data processing industry has been highly
decentralized, there is an accelerating trend toward consolidation in the
industry, resulting in fewer companies competing over larger geographic
regions. As consolidation continues, successful companies in this business are
likely to increase substantially in size as the scale of activity necessary to
compete increases.
 
                                   Employees
 
  As of December 31, 1998, M&I and its subsidiaries employed in the aggregate
approximately 10,756 employees. M&I considers employee relations to be
excellent. None of the employees of M&I or its subsidiaries are represented by
a collective bargaining group.
 
                          Supervision and Regulation
 
  As a registered bank holding company, M&I is subject to regulation and
examination by the FRB under the BHCA. M&I's state bank subsidiaries are
subject to regulation and examination by the Wisconsin Department of Financial
Institutions, or in the case of M&I Thunderbird Bank, the Arizona State
Banking Department. In addition, all of M&I's state chartered banks are
regulated by the FRB. M&I's federal savings bank subsidiary is subject to
regulation and examination by the Office of Thrift Supervision. M&I's national
bank subsidiary is subject to regulation and examination by the Office of the
Comptroller of the Currency. In addition, all of M&I's bank subsidiaries are
subject to examination by the FDIC.
 
                                       2
<PAGE>
 
  Under FRB policy, M&I is expected to act as a source of financial strength
to each of its bank subsidiaries and to commit resources to support each bank
subsidiary in circumstances when it might not do so absent such requirements.
In addition, there are numerous federal and state laws and regulations which
regulate the activities of M&I and its bank subsidiaries, including
requirements and limitations relating to capital and reserve requirements,
permissible investments and lines of business, transactions with affiliates,
loan limits, mergers and acquisitions, issuances of securities, dividend
payments, inter-affiliate liabilities, extensions of credit and branch
banking. Information regarding capital requirements for bank holding companies
and tables reflecting M&I's regulatory capital position at December 31, 1998
can be found in Note 13 of the Notes to the Consolidated Financial Statements
contained in Item 8, Consolidated Financial Statements and Supplementary Data.
 
  The federal regulatory agencies have broad power to take prompt corrective
action if a depository institution fails to maintain certain capital levels.
In addition, a bank holding company's controlled insured depository
institutions are liable for any loss incurred by the FDIC in connection with
the default of, or any FDIC-assisted transaction involving, an affiliated
insured bank or savings association. Current federal law provides that
adequately capitalized and managed bank holding companies from any state may
acquire banks and bank holding companies located in any other state, subject
to certain conditions. Banks are permitted to create interstate branching
networks in states that do not "opt out" of interstate branching.
 
  The laws and regulations to which M&I is subject are constantly under review
by Congress, regulatory agencies and state legislatures. These laws and
regulations may be changed dramatically in the future, which could affect the
ability of bank holding companies to engage in certain activities such as
nationwide banking, securities underwriting and insurance, the amount of
capital that banks and bank holding companies must maintain, premiums paid for
deposit insurance and other matters directly affecting earnings. It is not
certain which changes will occur, if any, or the effect such changes will have
on the profitability of M&I, its ability to compete effectively or the
composition of the financial services industry. The earnings and business of
M&I and its bank subsidiaries also are affected by the general economic and
political conditions in the United States and abroad and by the monetary and
fiscal policies of various federal agencies. The FRB impacts the competitive
conditions under which M&I operates by determining the cost of funds obtained
from money market sources for lending and investing and by exerting influence
on interest rates and credit conditions. In addition, legislative and economic
factors can be expected to have an ongoing impact on the competitive
environment within the financial services industry. The impact of fluctuating
economic conditions and federal regulatory policies on the future
profitability of M&I and its subsidiaries cannot be predicted with certainty.
 
                       Selected Statistical Information
 
  Statistical information relating to M&I and its subsidiaries on a
consolidated basis is set forth as follows:
 
  (1) Average Balance Sheets and Analysis of Net Interest Income for each of
      the last three years is included in Item 7, Management's Discussion and
      Analysis of Financial Position and Results of Operations.
 
  (2) Analysis of Changes in Interest Income and Interest Expense for each of
      the last two years is included in Item 7, Management's Discussion and
      Analysis of Financial Position and Results of Operations.
 
  (3) Nonaccrual, Past Due and Restructured Loans and Leases for each of the
      last five years is included in Item 7, Management's Discussion and
      Analysis of Financial Position and Results of Operations.
 
  (4) Summary of Loan and Lease Loss Experience for each of the last five
      years is included in Item 7, Management's Discussion and Analysis of
      Financial Position and Results of Operations.
 
  (5) Return on Average Shareholders' Equity, Return on Average Assets and
      other statistical ratios for each of the last five years can be found
      in Item 6, Selected Financial Data.
 
                                       3
<PAGE>
 
  The following tables set forth certain statistical information relating to
M&I and its subsidiaries on a consolidated basis.
 
                             Investment Securities
 
  The amortized cost of M&I's consolidated investment securities, other than
trading and other short-term investments, at December 31 of each year are ($
in thousands):
 
<TABLE>
<CAPTION>
                                                  1998       1997       1996
                                               ---------- ---------- ----------
<S>                                            <C>        <C>        <C>
U.S. Treasury and government agencies......... $3,658,730 $4,051,239 $3,112,647
States and political subdivisions.............  1,051,712    926,129    770,456
Other.........................................    304,174    326,329    287,726
                                               ---------- ---------- ----------
                                               $5,014,616 $5,303,697 $4,170,829
                                               ========== ========== ==========
</TABLE>
 
  The maturities, at amortized cost, and weighted average yields (for tax-
exempt obligations on a fully taxable basis assuming a 35% tax rate) of
investment securities at December 31, 1998 are ($ in thousands):
 
<TABLE>
<CAPTION>
                                            After One but    After Five but
                                             Within Five       Within Ten      After Ten
                         Within One Year        Years            Years           Years            Total
                         ----------------  ----------------  --------------  --------------  ----------------
                           Amount   Yield    Amount   Yield   Amount  Yield   Amount  Yield    Amount   Yield
                         ---------- -----  ---------- -----  -------- -----  -------- -----  ---------- -----
<S>                      <C>        <C>    <C>        <C>    <C>      <C>    <C>      <C>    <C>        <C>
U.S. Treasury and
 government agencies.... $1,256,605 6.75%  $2,239,892 6.76%  $159,962 6.33%  $  2,271 7.24%  $3,658,730 6.74%
States and political
 subdivisions...........     56,630 6.42      271,140 6.79    339,226 7.02    384,716 7.39    1,051,712 7.06
Other...................     59,613 7.32       94,826 7.10      8,094 7.49    141,641 5.07      304,174 6.21
                         ---------- ----   ---------- ----   -------- ----   -------- ----   ---------- ----
                         $1,372,848 6.76%  $2,605,858 6.78%  $507,282 6.81%  $528,628 6.77%  $5,014,616 6.77%
                         ========== ====   ========== ====   ======== ====   ======== ====   ========== ====
</TABLE>
 
                           Types of Loans and Leases
 
  M&I's consolidated loans and leases, classified by type, at December 31 of
each year are ($ in thousands):
 
<TABLE>
<CAPTION>
                            1998        1997        1996       1995       1994
                         ----------- ----------- ---------- ---------- ----------
<S>                      <C>         <C>         <C>        <C>        <C>
Commercial, financial
 and agricultural....... $ 4,025,663 $ 3,346,101 $2,904,341 $2,917,406 $2,661,190
Industrial development
 revenue bonds..........      52,174      49,126     32,241     29,358     31,796
Real estate:
  Construction..........     425,442     458,670    394,228    386,235    436,582
  Mortgage:
    Residential.........   4,045,022   4,146,416  2,560,936  2,325,805  2,554,790
    Commercial..........   3,667,924   3,450,897  2,477,652  2,286,537  2,154,212
                         ----------- ----------- ---------- ---------- ----------
      Total mortgage....   7,712,946   7,597,313  5,038,588  4,612,342  4,709,002
Personal................   1,166,541   1,161,608  1,181,846  1,169,920  1,184,810
Lease financing.........     613,400     489,094    331,505    277,680    256,690
                         ----------- ----------- ---------- ---------- ----------
                          13,996,166  13,101,912  9,882,749  9,392,941  9,280,070
Less:
  Allowance for loan and
   lease losses.........     226,052     208,651    161,659    166,815    159,506
                         ----------- ----------- ---------- ---------- ----------
Net loans and leases.... $13,770,114 $12,893,261 $9,721,090 $9,226,126 $9,120,564
                         =========== =========== ========== ========== ==========
</TABLE>
 
                                       4
<PAGE>
 
                    Loan and Lease Balances and Maturities
 
  The analysis of selected loan and lease maturities at December 31, 1998 and
the rate structure for the categories indicated are ($ in thousands):
 
<TABLE>
<CAPTION>
                                                                       Rate Structure of Loans and
                                           Maturity                     Leases Due After One Year
                         -------------------------------------------- ------------------------------
                                      Over One                        With Pre-    With
                          One Year  Year Through Over Five            determined Floating
                          Or Less    Five Years    Years     Total       Rate      Rate     Total
                         ---------- ------------ --------- ---------- ---------- -------- ----------
<S>                      <C>        <C>          <C>       <C>        <C>        <C>      <C>
Commercial, financial
 and agricultural....... $2,618,613  $1,285,707  $121,343  $4,025,663 $1,207,999 $199,051 $1,407,050
Industrial development
 revenue bonds..........     18,472       6,880    26,822      52,174     24,914    8,788     33,702
Real estate--
 construction...........    240,966     184,476       --      425,442     99,963   84,513    184,476
Lease financing.........    123,566     430,190    59,644     613,400    485,185    4,649    489,834
                         ----------  ----------  --------  ---------- ---------- -------- ----------
                         $3,001,617  $1,907,253  $207,809  $5,116,679 $1,818,061 $297,001 $2,115,062
                         ==========  ==========  ========  ========== ========== ======== ==========
</TABLE>
- --------
Notes:
(1) Scheduled repayments are reported in the maturity category in which the
    payments are due based on the terms of the loan agreements. Demand loans,
    loans having no stated schedule of repayments and no stated maturity, and
    over-drafts are reported as due in one year or less.
(2) Amounts shown for the rate structure of loans and leases due after one
    year include the estimated effect arising from the use of interest rate
    swaps.
 
            Nonaccrual, Past Due and Restructured Loans and Leases
 
  Generally, a loan is placed on nonaccrual if payment of interest is more
than 60 days delinquent and the loan has been determined by management to be a
"problem" loan. In addition, loans which are past due 90 days or more as to
interest or principal are also placed on nonaccrual. Exceptions to these rules
are generally only for loans fully collateralized by readily marketable
securities or other relatively risk free collateral.
 
                      Potential Problem Loans and Leases
 
  At December 31, 1998 the Corporation had $20.1 million of loans for which
payments are presently current, but the borrowers are experiencing serious
financial problems. These loans are subject to constant management attention
and their classification is reviewed on a quarterly basis.
 
                                   Deposits
 
  The average amount of and the average rate paid on selected deposit
categories for each of the years ended December 31 is as follows ($ in
thousands):
 
<TABLE>
<CAPTION>
                                1998              1997              1996
                          ----------------- ----------------- -----------------
                            Amount    Rate    Amount    Rate    Amount    Rate
                          ----------- ----- ----------- ----- ----------- -----
<S>                       <C>         <C>   <C>         <C>   <C>         <C>
Noninterest bearing
 demand deposits......... $ 2,545,724       $ 2,301,097       $ 2,116,197
Interest bearing demand
 deposits................   1,129,725 1.85%   1,017,535 1.89%     990,125 1.82%
Savings deposits.........   5,145,798 4.02%   3,921,297 3.88%   3,513,382 3.67%
Time deposits............   5,935,968 5.67%   4,999,866 5.78%   4,277,808 5.74%
                          -----------       -----------       -----------
Total deposits........... $14,757,215       $12,239,795       $10,897,512
                          ===========       ===========       ===========
</TABLE>
 
                                       5
<PAGE>
 
  The maturity distribution of time deposits issued in amounts of $100,000 and
over and outstanding at December 31, 1998 ($ in thousands) is:
 
<TABLE>
   <S>                                                               <C>
   Three months or less............................................. $  392,158
   Over three and through six months................................    267,877
   Over six and through twelve months...............................    303,061
   Over twelve months...............................................    545,523
                                                                     ----------
                                                                     $1,508,619
                                                                     ==========
</TABLE>
 
  At December 31, 1998, time deposits issued by foreign offices totaled $1.18
billion.
 
                             Short-Term Borrowings
 
  Information related to M&I's funds purchased and security repurchase
agreements for the last three years is as follows ($ in thousands):
 
<TABLE>
<CAPTION>
                                               1998        1997        1996
                                            ----------  ----------  ----------
   <S>                                      <C>         <C>         <C>
   Amount outstanding at year end.......... $1,712,165  $1,486,665  $1,418,858
   Average amount outstanding during the
    year...................................  2,042,371   1,820,744   1,094,464
   Maximum amount outstanding at any
    month's end............................  2,541,006   1,987,883   1,585,907
   Weighted average interest rate at year
    end....................................       4.39%       5.70%       5.70%
   Weighted average interest rate during
    the year...............................       5.36%       5.51%       5.27%
</TABLE>
 
                   Summary of Loan and Lease Loss Experience
 
  The following should be read in conjunction with Item 7, Management's
Discussion and Analysis of Financial Position and Results of Operations.
 
  The overall adequacy of the allowance for loan and lease losses is evaluated
through three levels of analysis. The first level focuses primarily on
assessments of individual credits based on the Corporation's credit grading
system which classifies loans and leases in a manner similar to that of bank
regulatory examiners. Management of the Corporation's affiliate banks, and
leasing subsidiaries are responsible for ongoing updating of assigned credit
grades and are required to perform a formal analysis and report on their
portfolios on a quarterly basis. This analysis considers several factors
including: changes in collateral values as well as detailed reviews of
specific large loan and lease relationships. For loans deemed to be impaired
due to an expectation that all contractual payments will probably not be
received estimates of loss are provided which take into account expected
payment performance and the estimated value of collateral. A formula allowance
is also calculated by applying loss factors to outstanding loans and leases
based on the internal risk grade of the loans or leases. Loss factors are
based on historical loss experience and may be adjusted for significant
factors that, in management's judgment, affect the collectibility of the
portfolio as of the evaluation date. Changes in risk grades of both performing
and nonperforming loans affect the amount of the formula allowance.
 
  The second level of analysis focuses on pools of homogeneous loans and
portfolio segments such as consumer installment, residential mortgage and home
equity and personal leasing. This analysis considers historical loss
experience and trends in payment performance (delinquencies). Loss factors for
pooled loans and leases are based on historical loss experience and may be
adjusted for significant factors that, in management's judgment, affect the
expected losses in the portfolio(s) as of the evaluation date.
 
  The third level of analysis results in an unallocated allowance that
recognizes the model and estimation risk associated with formula and specific
allowances. This element is based on management's evaluation of various
conditions, the effects of which are not directly measurable in determining
the formula and specific allowances.
 
                                       6
<PAGE>
 
The evaluation of the inherent loss regarding these conditions involves a
higher degree of uncertainty because they are not identified with specific
problem credits or portfolio segments. Such factors existing as of the
evaluation date include: general economic and business conditions affecting
key lending areas, credit quality trends including trends in nonperforming
loans expected to result from existing conditions, collateral values, loan
volumes and concentrations, portfolio seasoning, specific industry conditions
within portfolio segments, recent loss experience in particular segments of
the portfolio and portfolio growth in new markets.
 
  Management's assigned credit grades, quarterly reporting and portfolio
evaluations are subject to independent monitoring by the Corporation's credit
review group. Through periodic review of affiliate credit grading and
administration, analysis of management's quarterly reporting, and ongoing
monitoring of portfolio and economic trends, this group provides support in
confirming the adequacy of the allowance. The adequacy of the allowance is
also reviewed as part of the regulatory examination process.
 
  The allowance for loan and lease losses is based on estimates of probable
losses inherent in the loan and lease portfolio. The amount actually observed
for these losses can vary significantly from the estimated amounts. By
assessing the probable estimated losses on a quarterly basis, management is
able to adjust specific and inherent loss estimates based on recent
information as it becomes available.
 
  Consolidated net charge-offs were $9.7 million in 1998 compared with $13.4
million in 1997 and $ 20.4 million in 1996. Approximately $5.2 million of the
net charge-off activity in 1998 was incurred in the fourth quarter. Excluding
one large recovery, net charge-offs in 1998 would have been approximately
$14.0 million which is consistent with prior years.
 
  The provision for loan and lease losses was $27.1 million in 1998 compared
with $17.6 million in 1997. The increase reflects increased diversity in the
loan portfolio (growth in loan types and newer geographical markets with
higher expected loss factors or losses), loan portfolio growth of $900
million, the general increase in nonaccrual loans throughout the year
(especially in the fourth quarter), increased net charge-offs in the fourth
quarter, the impact of Asian and Latin American economies on selected
customers and signs of softening in the domestic economy. At December 31,
1998, the allowance for loan and lease losses amounted to $226.1 million and
is considered adequate based on the analyses previously discussed.
 
  The Corporation's charge-off level for 1999 will continue to be affected by
the numerous factors previously discussed. The Corporation anticipates charge-
off levels in 1999 to be higher than 1998 and generally higher than recent
historical charge-off levels. There are currently no known material loans
believed to be in imminent danger of deteriorating or defaulting which would
give rise to a large near-term charge-off; however, in the event a large loan
or loans deteriorate unexpectedly or actual losses in industry segments within
the portfolio are negatively impacted by the economy, declining collateral
values or an increase in delinquencies, loss levels could be significantly
adversely affected.
 
                          Forward-Looking Statements
 
  This report contains statements that may constitute forward-looking
statements within the meaning of the Private Securities Litigation Reform Act
of 1995, such as statements other than historical facts contained or
incorporated by reference in this report. These statements speak of M&I's
plans, goals, beliefs or expectations, refer to estimates or use similar
terms. Future filings by M&I with the Securities and Exchange Commission, and
statements other than historical facts contained in written material, press
releases and oral statements issued by, or on behalf of, M&I may also
constitute forward-looking statements.
 
  Forward-looking statements are subject to significant risks and
uncertainties, and M&I's actual results may differ materially from the results
discussed in such forward-looking statements. Factors that might cause actual
results to differ from the results discussed in forward-looking statements
include, but are not limited to:
 
  . General economic conditions, either nationally or in the states in which
    M&I does business;
 
                                       7
<PAGE>
 
  . Legislation or regulatory changes which adversely affect the businesses
    in which M&I is engaged;
 
  . Changes in the interest rate environment which reduce interest margins;
 
  . Changes in securities markets with respect to the market value of
    financial assets and the level of volatility in certain markets such as
    foreign exchange;
 
  . Significant increases in competition in the banking and financial
    services industry resulting from industry consolidation, regulatory
    changes and other factors, as well as actions taken by particular
    competitors;
 
  . M&I's success in continuing to generate significant levels of new
    business in its existing markets and in identifying and penetrating
    targeted markets;
 
  . Changes in consumer spending, borrowing and saving habits;
 
  . Technological changes;
 
  . Acquisitions and unanticipated occurrences which delay or reduce the
    expected benefits of acquisitions;
 
  . M&I's ability to continue to fund and accomplish technological
    innovation, improve processes and controls and attract and retain capable
    staff in order to deal with the Year 2000 Issue;
 
  . The ability of M&I's various vendors and others with whom M&I interacts
    to address the Year 2000 Issue on a timely basis and in a manner that
    allows them to continue normal business operations and furnish products,
    services or data to M&I without disruption;
 
  . M&I's ability to increase market share and control expenses;
 
  . The effect of compliance with legislation or regulatory changes;
 
  . The effect of changes in accounting policies and practices; and
 
  . The costs and effects of unanticipated litigation and of unexpected or
    adverse outcomes in such litigation.
 
  All forward-looking statements contained in this report are based upon
information presently available and M&I assumes no obligation to update any
forward-looking statement.
 
ITEM 2. PROPERTIES
 
  M&I and M&I Marshall & Ilsley Bank ("M&I Bank") occupy offices on all or
portions of 16 floors of a 21-story building located at 770 North Water
Street, Milwaukee, Wisconsin. A subsidiary of M&I Bank owns the building and
its adjacent 10-story parking lot and leases the remaining floors to a
professional tenant. In addition, various subsidiaries of M&I lease commercial
office space in downtown Milwaukee office buildings near the 770 North Water
Street facility. M&I Bank also owns or leases various branch offices located
in Milwaukee and in surrounding suburban communities. M&I has 26 subsidiary
banks throughout Wisconsin. M&I Thunderbird Bank, a wholly-owned bank
subsidiary of M&I, is located in Phoenix, Arizona and has 13 offices in
Phoenix and the surrounding Maricopa County communities. M&I Bank FSB, a
federal savings bank subsidiary of M&I, is located in Zion, Illinois and has 6
offices in the northern Chicago, Illinois suburbs. The subsidiary banks and
savings association occupy modern facilities which are owned or leased. M&I
owns a data processing facility located in Brown Deer, a suburb of Milwaukee,
from which M&I Data Services conducts data processing activities. M&I owns an
160,000 square foot facility in Milwaukee that houses the software development
teams of M&I Data Services. Properties leased by M&I for M&I Data Services
also include commercial office space in Brown Deer, a data processing site in
Oak Creek, Wisconsin, and processing centers and sales offices in various
cities throughout the United States.
 
ITEM 3. LEGAL PROCEEDINGS
 
  M&I is not currently involved in any material pending legal proceedings
other than litigation of a routine nature and various legal matters which are
being defended and handled in the ordinary course of business.
 
                                       8
<PAGE>
 
ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS
 
  Not applicable.
 
                      Executive Officers of the Registrant
 
<TABLE>
<CAPTION>
 Name of Officer                              Office
 ---------------                              ------
 <C>               <S>
 J.B. Wigdale      Chairman of the Board since December 1992, Chief Executive
  Age 62           Officer since October 1992, Director since December 1988,
                   Vice Chairman of the Board, December 1988 to December 1992,
                   Marshall & Ilsley Corporation; Chairman of the Board since
                   January 1989, Chief Executive Officer since 1987, Director
                   since 1981, M&I Marshall & Ilsley Bank; Director-M&I First
                   National Leasing Corp., M&I Mortgage Corp., M&I Data
                   Services, M&I Insurance Services, Inc., M&I Brokerage
                   Services, Inc., M&I Capital Markets Group L.L.C. and
                   Marshall & Ilsley Trust Company.
 
 D.J. Kuester      Director since February 1994, President since 1987, Marshall
  Age 57           & Ilsley Corporation; President and Director since January
                   1989, M&I Marshall & Ilsley Bank; Chairman of the Board and
                   Director, M&I Data Services; Director-M&I Support Services
                   Corp. and M&I New England, Inc.; Director and President-M&I
                   Insurance Company of Arizona, Inc.
 
 G.H. Gunnlaugsson Director since February 1994, Executive Vice President and
  Age 54           Chief Financial Officer since 1987, Marshall & Ilsley
                   Corporation; Vice President of M&I Marshall & Ilsley Bank
                   since 1976; Vice President and Director-M&I Insurance
                   Company of Arizona, Inc.; Director-M&I Mortgage Corp., M&I
                   Data Services, M&I Insurance Services, Inc., M&I Brokerage
                   Services, Inc., M&I Capital Markets Group L.L.C. and M&I
                   Bank FSB.
 
 G.D. Strelow      Senior Vice President and Human Resources Director of
  Age 64           Marshall & Ilsley Corporation since 1993; Vice President and
                   Human Resources Director of M&I Marshall & Ilsley Bank since
                   1980.
 
 M.A. Hatfield     Senior Vice President since 1993, Secretary since 1981 and
  Age 53           Treasurer from 1986 to May 1995, Marshall & Ilsley
                   Corporation; Vice President and Secretary, M&I Marshall &
                   Ilsley Bank; Director-M&I Support Services Corp.; Secretary-
                   M&I First National Leasing Corp., M&I Capital Markets Group
                   L.L.C., Marshall & Ilsley Trust Company, M&I Investment
                   Management Corp., Marshall & Ilsley Trust Company of
                   Florida, M&I Insurance Services, Inc., M&I EastPoint
                   Technology, Inc. and M&I Brokerage Services, Inc.; Secretary
                   and Director-M&I Insurance Company of Arizona, Inc., M&I
                   Data Services, M&I New England, Inc., Richter-Schroeder
                   Company, Inc. and M&I Bank FSB; Secretary and Treasurer, M&I
                   Mortgage Corp.
 
 P.R. Justiliano   Senior Vice President since 1994 and Corporate Controller
  Age 48           since April 1989, Vice President, 1986 to 1994, Marshall &
                   Ilsley Corporation; Director and Treasurer, M&I Insurance
                   Company of Arizona, Inc.; Director-M&I Bank FSB.
 
 J.L. Delgadillo   Senior Vice President of Marshall & Ilsley Corporation since
  Age 46           1993; Chief Executive Officer since January 1998 and
                   Director of M&I Data Services since 1994; President and
                   Chief Operating Officer of M&I Data Services since 1993;
                   Senior Vice President of M&I Data Services from 1989 to
                   1993; Director and Executive Vice President-M&I EastPoint
                   Technology, Inc.; Director and President-M&I New England,
                   Inc.
 
 D.R. Jones        Senior Vice President since December 1993, Vice President
  Age 53           and Affiliate Bank Manager since May 1993, Vice President
                   and South Regional Manager from March 1989 to May 1993,
                   Marshall & Ilsley Corporation; Director-M&I Support Services
                   Corp.
 
 T.M. Bolger       Senior Vice President and Chief Credit Officer since 1994,
  Age 49           Marshall & Ilsley Corporation; Executive Vice President
                   since 1997, M&I Marshall & Ilsley Bank; Director-Richter-
                   Schroeder Company, Inc. and M&I Bank FSB.
</TABLE>
 
                                       9
<PAGE>
 
<TABLE>
<CAPTION>
    Name of
    Officer                                 Office
    -------                                 ------
 
 <C>           <S>
 D.H. Wilson   Senior Vice President and Treasurer since December 1996, Vice
  Age 39       President and Treasurer since 1995, Marshall & Ilsley
               Corporation; Vice President, Treasury from June 1992 to May
               1995, ABN AMRO/LaSalle National Bank; Director-M&I Custody of
               Nevada, Inc.
 
 T.J. O'Neill  Senior Vice President since April 1997, Marshall & Ilsley
  Age 38       Corporation; Senior Vice President since 1997, Vice President
               since 1990, M&I Marshall & Ilsley Bank; President and Director,
               M&I Bank FSB and M&I Dealer Finance, Inc.; Director-M&I Support
               Services Corp.
 
 J.V. Williams Senior Vice President since December 1997, Marshall & Ilsley
  Age 54       Corporation; Executive Vice President and Chief Operating
               Officer since January 1999, Marshall & Ilsley Trust Company;
               President, Chief Executive Officer and Director since January
               1996, M&I Insurance Services, Inc.; Senior Vice President since
               1994, M&I Marshall & Ilsley Bank; President, Chief Executive
               Officer and Director since February 1989, M&I Brokerage
               Services, Inc.; Director-M&I Investment Management Corp. and M&I
               Portfolio Services, Inc.
</TABLE>
 
                                    PART II
 
ITEM 5. MARKET FOR REGISTRANT'S COMMON STOCK AND RELATED STOCKHOLDER MATTERS
 
                                 Stock Listing
 
  M&I's common stock is traded under the symbol "MRIS" on the Nasdaq National
Market, and quotations are supplied by the National Association of Securities
Dealers. Common dividends declared and the price range for M&I's common stock
for each of the last five years can be found in Item 8, Consolidated Financial
Statements, Quarterly Financial Information and Supplementary Data.
 
  A discussion of the regulatory restrictions on the payment of dividends can
be found under Item 7, Management's Discussion and Analysis of Financial
Position and Results of Operations, and in Note 13 to Item 8, Consolidated
Financial Statements.
 
                           Holders of Common Equity
 
  At December 31, 1998, M&I had approximately 21,410 record holders of its
Common Stock.
 
 
                                      10
<PAGE>
 
ITEM 6. SELECTED FINANCIAL DATA
 
                        Consolidated Summary of Earnings
               Years ended December 31 ($000's except share data)
 
<TABLE>
<CAPTION>
                                1998       1997       1996      1995     1994
                             ---------- ---------- ---------- -------- --------
<S>                          <C>        <C>        <C>        <C>      <C>
Interest Income:
  Loans and Leases.........  $1,085,829 $  921,161 $  804,951 $817,247 $713,904
  Investment Securities:
    Taxable................     280,377    240,238    198,787  146,498  127,927
    Tax Exempt.............      52,969     45,420     30,718   18,112   16,693
  Other Short-term
   Investments.............      14,869     13,514     11,365   14,439    9,590
                             ---------- ---------- ---------- -------- --------
      Total Interest
       Income..............   1,434,044  1,220,333  1,045,821  996,296  868,114
Interest Expense:
  Deposits.................     564,540    460,418    392,473  363,488  274,211
  Short-term Borrowings....     126,624    111,193     63,892   48,390   39,978
  Long-term Borrowings.....      66,810     54,175     53,615   63,701   38,870
                             ---------- ---------- ---------- -------- --------
      Total Interest
       Expense.............     757,974    625,786    509,980  475,579  353,059
                             ---------- ---------- ---------- -------- --------
Net Interest Income........     676,070    594,547    535,841  520,717  515,055
Provision for Loan and
 Lease Losses..............      27,090     17,633     15,634   16,558   25,627
                             ---------- ---------- ---------- -------- --------
Net Interest Income After
 Provision for Loan and
 Lease Losses..............     648,980    576,914    520,207  504,159  489,428
Other Income:
  Data Processing Services.     412,632    343,846    268,526  213,914  159,418
  Trust Services...........      88,496     78,595     70,190   64,176   59,720
  Net Securities Gains
   (Losses)................      30,783      4,127     15,471    5,189   (5,752)
  Other....................     224,422    181,901    157,087  146,319  151,256
                             ---------- ---------- ---------- -------- --------
      Total Other Income...     756,333    608,469    511,274  429,598  364,642
Other Expense:
  Salaries and Benefits....     523,606    460,164    392,711  352,466  330,720
  Merger/Restructuring.....      23,373        --         --       --    75,228
  Other....................     393,049    337,047    320,821  268,353  268,360
                             ---------- ---------- ---------- -------- --------
      Total Other Expense..     940,028    797,211    713,532  620,819  674,308
                             ---------- ---------- ---------- -------- --------
Income Before Taxes........     465,285    388,172    317,949  312,938  179,762
Provision for Income Taxes.     163,962    131,487    111,314  111,247   77,784
                             ---------- ---------- ---------- -------- --------
Income Before Extraordinary
 Items.....................     301,323    256,685    206,635  201,691  101,978
Extraordinary Items........         --         --         --       --    11,542
                             ---------- ---------- ---------- -------- --------
      Net Income...........  $  301,323 $  256,685 $  206,635 $201,691 $113,520
                             ========== ========== ========== ======== ========
</TABLE>
 
                                       11
<PAGE>
 
                  Consolidated Summary of Earnings--continued
               Years ended December 31 ($000's except share data)
 
<TABLE>
<CAPTION>
                                         1998    1997    1996    1995    1994
                                        ------  ------  ------  ------  ------
<S>                                     <C>     <C>     <C>     <C>     <C>
Per Share:
  Basic Net Income Before Extraordinary
   Items............................... $ 2.79  $ 2.62  $ 2.12  $ 2.04  $ 1.01
  Basic Net Income After Extraordinary
   Items...............................   2.79    2.62    2.12    2.04    1.13
  Diluted Net Income Before
   Extraordinary Items.................   2.61    2.43    1.98    1.91    0.96
  Diluted Net Income After
   Extraordinary Items.................   2.61    2.43    1.98    1.91    1.07
  Common Dividends Declared............  0.860   0.785   0.720   0.645   0.590
Other Significant Data:
  Year-End Common Stock Price.......... $58.44  $62.13  $34.63  $26.00  $19.00
  Return on Average Shareholders'
   Equity Before Extraordinary Items...  14.13%  16.49%  15.03%  15.91%   8.63%
  Return on Average Shareholders'
   Equity After Extraordinary Items....  14.13   16.49   15.03   15.91    9.61
  Return on Average Assets Before
   Extraordinary Items.................   1.45    1.51    1.41    1.48    0.78
  Return on Average Assets After
   Extraordinary Items.................   1.45    1.51    1.41    1.48    0.86
  Dividend Payout Ratio................  32.95   32.30   36.36   33.77   55.14
  Average Equity to Average Assets
   Ratio...............................  10.26    9.15    9.39    9.27    8.98
  Ratio of Earnings to Fixed Charges*
    Excluding Interest on Deposits.....   3.25x   3.21x   3.52x   3.62x   3.10x
    Including Interest on Deposits.....   1.60x   1.61x   1.61x   1.65x   1.50x
</TABLE>
- --------
   * See Exhibit 12 for detailed computation of these ratios.
 
                                       12
<PAGE>
 
                      Consolidated Average Balance Sheets
               Years ended December 31 ($000's except share data)
 
<TABLE>
<CAPTION>
                              1998         1997         1996         1995         1994
                          ------------  -----------  -----------  -----------  -----------
<S>                       <C>           <C>          <C>          <C>          <C>
Assets:
 Cash and Due from
  Banks.................  $    652,988  $   614,824  $   586,985  $   588,012  $   621,598
 Short-term
  Investments...........       247,049      206,295      188,082      237,094      212,503
 Trading Securities.....        43,404       40,822       25,264       10,346        4,528
 Investment Securities:
   Taxable..............     4,317,668    3,570,225    3,104,010    2,405,046    2,373,398
   Tax Exempt...........     1,078,333      913,130      668,913      374,014      351,026
 Loans and Leases:
   Commercial...........     3,749,518    3,128,568    2,947,631    2,842,688    2,691,284
   Real Estate..........     7,967,626    6,309,818    5,139,926    5,268,669    4,980,686
   Personal.............     1,154,110    1,147,203    1,148,511    1,165,852    1,205,786
   Lease Financing......       532,043      394,024      293,448      262,566      256,344
                          ------------  -----------  -----------  -----------  -----------
 Total Loans and
  Leases................    13,403,297   10,979,613    9,529,516    9,539,775    9,134,100
 Allowance for Loan and
  Lease Losses..........       216,456      174,525      166,886      166,350      150,148
                          ------------  -----------  -----------  -----------  -----------
 Net Loans and Leases...    13,186,841   10,805,088    9,362,630    9,373,425    8,983,952
 Other Assets...........     1,263,890      851,030      709,803      681,997      601,766
                          ------------  -----------  -----------  -----------  -----------
     Total Assets.......  $ 20,790,173  $17,001,414  $14,645,687  $13,669,934  $13,148,771
                          ============  ===========  ===========  ===========  ===========
Liabilities and
 Shareholders' Equity:
 Noninterest Bearing
  Deposits..............  $  2,545,724  $ 2,301,097  $ 2,116,197  $ 2,003,662  $ 2,070,874
 Interest Bearing
  Deposits:
   Savings and NOW
    Accounts............     2,140,380    1,915,888    1,905,775    2,078,354    2,488,347
   Money Market Savings.     4,135,143    3,022,944    2,597,732    2,113,550    1,645,052
   CDs of $100 or more..     1,547,816    1,334,532      933,164      693,345      499,941
   Other................     4,388,152    3,665,334    3,344,644    3,393,785    3,440,167
                          ------------  -----------  -----------  -----------  -----------
 Total Deposits.........    14,757,215   12,239,795   10,897,512   10,282,696   10,144,381
 Short-term Borrowings..     2,357,161    2,017,829    1,218,177      850,258      973,909
 Long-term Borrowings...     1,046,321      787,819      823,397      959,022      594,870
 Accrued Expenses and
  Other Liabilities.....       496,439      399,605      331,743      310,332      254,442
 Shareholders' Equity...     2,133,037    1,556,366    1,374,858    1,267,626    1,181,169
                          ------------  -----------  -----------  -----------  -----------
     Total Liabilities
      and Shareholders'
      Equity............  $ 20,790,173  $17,001,414  $14,645,687  $13,669,934  $13,148,771
                          ============  ===========  ===========  ===========  ===========
Other Significant Data:
 Book Value Per Share
  at Year End...........  $      19.88  $     17.94  $     13.75  $     13.34  $     11.38
 Average Common Shares
  Outstanding...........   105,918,139   95,831,283   95,895,547   97,794,476   99,028,495
 Shareholders of Record
  at Year End*..........        21,410       21,157       18,460       18,659       18,919
 Employees at Year
  End*..................        10,756       10,227        8,995        9,079        8,634
Historically Reported
 Credit Quality Ratios:*
 Net Loan and Lease
  Charge-offs to
  Average Loans and
  Leases................          0.07%        0.13%        0.23%        0.10%        0.05%
 Total Nonperforming
  Loans and Leases** &
  OREO to End of Period
  Loans and Leases &
  OREO..................          0.85         0.70         0.81         0.79         0.80
 Allowance for Loan and
  Lease Losses to End
  of Period Loans and
  Leases................          1.62         1.62         1.68         1.82         1.75
 Allowance for Loan and
  Lease Losses to Total
  Nonperforming Loans
  and Leases**..........           206          275          225          261          265
</TABLE>
- --------
   * Not restated for acquisitions accounted for as pooling of interests.
  ** Loans and leases nonaccrual, restructured, and past due 90 days or more.
 
                                       13
<PAGE>
 
                             Yield & Cost Analysis
                 Years ended December 31 (Tax equivalent basis)
 
<TABLE>
<CAPTION>
                                                 1998  1997  1996  1995  1994
                                                 ----  ----  ----  ----  -----
<S>                                              <C>   <C>   <C>   <C>   <C>
Average Rates Earned:
  Loans & Securitized ARMs...................... 8.09% 8.36% 8.41% 8.58%  7.84%
  Investment Securities--Taxable................ 6.26  6.62  6.29  6.09   5.39
  Investment Securities--Tax Exempt............. 7.44  7.40  6.76  6.89   6.86
  Trading Securities............................ 5.13  5.01  4.83  5.05   5.39
  Short-term Investments........................ 5.13  5.57  5.40  5.89   4.41
Average Rates Paid:
  Interest Bearing Deposits..................... 4.62% 4.63% 4.47% 4.39%  3.40%
  Short-term Borrowings......................... 5.37  5.51  5.24  5.69   4.10
  Long-term Borrowings.......................... 6.39  6.88  6.51  6.64   6.53
  M&I Marshall & Ilsley Bank Average Prime Rate. 8.35  8.44  8.27  8.83   7.15
Summary Yield and Cost Analysis:
 (As a % of Average Assets)
  Average Yield................................. 7.02% 7.31% 7.25% 7.37%  6.68%
  Average Cost.................................. 3.64  3.68  3.48  3.48   2.69
                                                 ----  ----  ----  ----  -----
  Net Interest Income........................... 3.38  3.63  3.77  3.89   3.99
  Provision for Loan and Lease Losses........... 0.13  0.10  0.11  0.12   0.19
                                                 ----  ----  ----  ----  -----
  Net Interest Income After Provision for Loan
   and Lease Losses............................. 3.25  3.53  3.66  3.77   3.80
  Net Securities Gains (Losses)................. 0.15  0.02  0.11  0.04  (0.04)
  Other Income.................................. 3.49  3.55  3.39  3.10   2.82
  Other Expense................................. 4.52  4.68  4.88  4.54   5.14
                                                 ----  ----  ----  ----  -----
  Income Before Income Taxes.................... 2.37  2.42  2.28  2.37   1.44
  Provision for Income Taxes.................... 0.92  0.91  0.87  0.89   0.66
                                                 ----  ----  ----  ----  -----
  Income Before Extraordinary Items............. 1.45% 1.51% 1.41% 1.48%  0.78%
                                                 ====  ====  ====  ====  =====
    Net Income.................................. 1.45% 1.51% 1.41% 1.48%  0.86%
                                                 ====  ====  ====  ====  =====
</TABLE>
 
                                       14
<PAGE>
 
ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL POSITION AND RESULTS
       OF OPERATIONS
 
  Net income in 1998 amounted to $301.3 million or $2.61 per share on a
diluted basis. The return on average assets and return on average equity were
1.45% and 14.13%, respectively. By comparison, 1997 net income was $256.7
million, diluted earnings per share was $2.43, the return on average assets
was 1.51% and the return on average equity was 16.49%. For the year ended
December 31, 1996, net income was $206.6 million or $1.98 per share diluted
and the returns on average assets and average equity were 1.41% and 15.03%,
respectively.
 
  On April 1, 1998, the Corporation completed the merger with Advantage
Bancorp, Inc. ("Advantage") a Kenosha, Wisconsin based savings and loan
holding company by issuing 1.2 shares of the Corporation's Common Stock for
each share of Advantage Common Stock. At the time of merger, Advantage had
consolidated assets of $1.0 billion. The transaction was accounted for as a
pooling of interests. In conjunction with this transaction, the Corporation
recorded a merger/restructuring charge of approximately $16.3 million ($23.4
million before-tax). See Note 3 of Notes to Consolidated Financial Statements
for the detailed description of the merger/restructuring charge.
 
  The results of operations and average financial position for 1998 and 1997
also include the effects of the acquisition of Security Capital Corporation
("Security") from the date of merger which was October 1, 1997. M&I paid
approximately $376 million in cash and issued 12.3 million shares of its
common stock in a transaction that was accounted for as a purchase. Security
had approximately $2.2 billion of consolidated loans and $2.3 billion of
consolidated deposits at the time of merger.
 
  Net income for 1996 includes special one-time charges relating to the
Savings Association Insurance Fund (SAIF) recapitalization assessment, the
write-off of in-process research and development costs acquired in conjunction
with the purchase of EastPoint Technology, Inc., and the write-off of
intangibles by Advantage.
 
  The following is a summary of the unusual items reported in 1998 and 1996
and the comparative operating income, earnings per share and return on average
equity based on operating income for 1998, 1997, and 1996.
 
<TABLE>
<CAPTION>
                                                          1998    1997    1996
                                                         ------  ------  ------
                                                           ($ in millions,
                                                           except per share
                                                                data)
<S>                                                      <C>     <C>     <C>
Net Income.............................................. $301.3  $256.7  $206.6
Special Charges
  Merger/Restructuring Charges..........................   16.3     --      --
  SAIF Assessment.......................................    --      --      4.4
  Intangible Asset Writedown............................    --      --      3.0
  Acquired In-Process Research and Development..........    --      --      7.9
                                                         ------  ------  ------
Total Special Charges...................................   16.3     --     15.3
                                                         ------  ------  ------
Operating Income........................................ $317.6  $256.7  $221.9
                                                         ======  ======  ======
Operating Income Per Share
  Basic................................................. $ 2.94  $ 2.62  $ 2.28
  Diluted............................................... $ 2.76  $ 2.43  $ 2.12
Operating Income to Average Equity......................  14.89%  16.49%  16.14%
</TABLE>
 
  The following reconciles operating income to operating income before
amortization of intangibles ("tangible operating income"). Amortization
includes amortization of goodwill and core deposit premiums and is net of
negative goodwill accretion and the income tax benefit or expense, if any,
related to each component. These calculations were specifically formulated by
the Corporation and may not be comparable to similarly titled measures
reported by other companies.
 
                                      15
<PAGE>
 
    Summary Consolidated Tangible Operating Income and Financial Statistics
                    ($ in millions, except per share data)
 
<TABLE>
<CAPTION>
                                                          1998    1997    1996
                                                         ------  ------  ------
<S>                                                      <C>     <C>     <C>
Operating Income........................................ $317.6  $256.7  $221.9
Amortization, Net of Tax................................   21.0     8.5     4.6
                                                         ------  ------  ------
Tangible Operating Income............................... $338.6  $265.2  $226.5
                                                         ======  ======  ======
Tangible Operating Income Per Share
  Basic................................................. $ 3.14  $ 2.71  $ 2.33
  Diluted............................................... $ 2.94  $ 2.51  $ 2.17
Return on Average Tangible Assets.......................   1.65%   1.57%   1.55%
Return on Average Tangible Equity.......................  18.48%  18.35%  17.02%
</TABLE>
 
  Operating Income Statement Components as a Percent of Average Total Assets
 
  The following table presents a summary of the major elements of the
consolidated operating income statements for the years ended December 31,
1998, 1997 and 1996. Each of the elements is stated as a percent of
consolidated average total assets outstanding for the respective year and,
where appropriate, is converted to a fully taxable equivalent basis (FTE). The
results exclude the special charges in 1998 and 1996 as previously discussed.
 
<TABLE>
<CAPTION>
                                                            1998   1997   1996
                                                            -----  -----  -----
<S>                                                         <C>    <C>    <C>
Interest Income............................................  7.02%  7.31%  7.25%
Interest Expense........................................... (3.64) (3.68) (3.48)
                                                            -----  -----  -----
Net Interest Income........................................  3.38   3.63   3.77
Provision for Loan and Lease Losses........................ (0.13) (0.10) (0.11)
Net Securities Gains.......................................  0.15   0.02   0.11
Other Income...............................................  3.49   3.55   3.39
Other Expense.............................................. (4.41) (4.68) (4.71)
                                                            -----  -----  -----
Income Before Income Taxes.................................  2.48   2.42   2.45
Income Taxes............................................... (0.95) (0.91) (0.93)
                                                            -----  -----  -----
Operating Income To Average Assets.........................  1.53%  1.51%  1.52%
                                                            =====  =====  =====
</TABLE>
 
                              Net Interest Income
 
  Net interest income in 1998 amounted to $676.1 million, an increase of $81.6
million or 13.7% compared with net interest income of $594.5 million in 1997.
 
  Average earning assets in 1998 amounted to $19.1 billion compared to $15.7
billion in 1997, an increase of $3.4 billion or 21.5%. Average loans and
leases, excluding the effect of securitizing adjustable rate mortgage loans
(ARMs) increased $2.7 billion or 23.5% of which, approximately $1.7 billion is
attributable to the Security merger. The remaining growth in average earning
assets was primarily attributable to investment securities. Approximately $840
million of the growth in investment securities is attributable to the Security
merger.
 
  Average interest bearing liabilities increased $2.9 billion or 22.5% in 1998
compared to 1997. Average interest bearing deposits increased $2.3 billion or
22.9%. Average short-term borrowings increased $339 million while average
long-term borrowings increased $259 million. Average noninterest bearing
deposits increased $245 million or 10.6% in 1998 compared to the prior year.
The Security merger accounted for approximately $1.8 billion of the growth in
average deposits, $129 million of the growth in average short-term borrowings
and increased average long-term borrowings by approximately $348 million.
 
                                      16
<PAGE>
 
  In 1998, $132 million of FHLB advances matured. Approximately $75 million
was refinanced with new FHLB advances. During 1997, the holder of the
Corporation's 8.5% convertible subordinated notes converted $16.8 million of
the notes to Series A convertible preferred stock and the remaining $130.0
million of the Corporation's banking subsidiaries' Bank Notes matured and were
refinanced primarily with short-term borrowings and brokered certificates of
deposit. In addition, $104.3 million of the Corporation's Medium Term Notes
Series B and C matured and were refinanced with Medium Term Notes Series C and
D. Medium Term maturities amounted to $1.8 million in 1998.
 
  The growth and composition of the Corporation's average loan and lease
portfolio for the current year and prior two years are reflected in the
following table. The securitized ARM loans that are classified as investment
securities available for sale are included to provide a more meaningful
comparison ($ in millions):
 
<TABLE>
<CAPTION>
                                                                     Percent
                                                                      Growth
                                                                    -----------
                                                                    1998  1997
                                                                     vs    vs
                                        1998      1997      1996    1997  1996
                                      --------- --------- --------- ----  -----
<S>                                   <C>       <C>       <C>       <C>   <C>
Commercial Loans....................  $ 3,749.5 $ 3,128.6 $ 2,947.6 19.8%   6.1%
Real Estate Loans:
  Construction......................      421.3     405.5     308.7  3.9   31.4
  Commercial Mortgages..............    3,545.1   2,787.7   2,341.2 27.2   19.1
  Residential Mortgages.............    4,001.3   3,116.6   2,490.1 28.4   25.2
  Securitized ARM Loans.............      919.3     618.2     483.5 48.7   27.9
                                      --------- --------- --------- ----  -----
Total Real Estate Loans & ARMs......    8,887.0   6,928.0   5,623.5 28.3   23.2
Personal Loans:
  Student Loans.....................      268.8     280.8     293.0 (4.3)  (4.2)
  Other Personal Loans..............      885.3     866.4     855.5  2.2    1.3
                                      --------- --------- --------- ----  -----
Total Personal Loans................    1,154.1   1,147.2   1,148.5  0.6   (0.1)
Lease Financing Receivables:
  Commercial........................      329.6     292.0     260.5 12.9   12.1
  Personal..........................      202.4     102.0      32.9 98.4  210.0
                                      --------- --------- --------- ----  -----
Total Lease Financing Receivables...      532.0     394.0     293.4 35.0   34.3
                                      ========= ========= ========= ====  =====
Total Consolidated Average Loans,
 Leases & ARMs......................  $14,322.6 $11,597.8 $10,013.0 23.5%  15.8%
                                      ========= ========= ========= ====  =====
Total Consolidated Average Loans and
 Leases.............................  $13,403.3 $10,979.6 $ 9,529.5 22.1%  15.2%
                                      ========= ========= ========= ====  =====
</TABLE>
 
  As previously discussed, the annual loan growth is largely attributable to
the Security merger. Adjusting for Security's 1997 pre-merger average balances
total consolidated average loans, leases and ARM's grew approximately $618.0
million or 4.5% in 1998, with commercial loans growing approximately $574.2
million or 18.1%, commercial real estate loans increasing approximately $186.8
million or 5.6%, lease financing receivables growing approximately $124.7
million or 30.6%, and construction loans growing approximately $15.7 million
or 3.9%. Partially offsetting those increases were reductions of approximately
$270.3 million or 5.2% in residential real estate loans and ARMs and
approximately $13.1 million or 1.1% for personal loans. The decrease in
residential real estate and ARM loans reflects the effect of increased
prepayments associated with customer refinancings to fixed rate loans in
response to the recent interest rate environment. Generally, the Corporation
sells fixed rate residential real estate loans in the secondary market. One to
four family residential real estate loans sold to investors amounted to $2.2
billion in 1998 compared to $0.8 billion in 1997 and $0.5 billion in 1996.
 
  During 1998, approximately $259 million of ARM loans were converted into
government guaranteed agency pool securities. ARM loans totaling approximately
$218 million and $224 million were securitized in 1997 and 1996, respectively,
and in 1997 approximately $580 million of securitized ARMs were acquired in
the Security merger.
 
                                      17
<PAGE>
 
  The growth and composition of the Corporation's consolidated average
deposits for the current year and prior two years are reflected below ($ in
millions):
 
<TABLE>
<CAPTION>
                                                           Percent
                                                            Growth
                                                          -----------
                                                          1998  1997
                                                          vs.    vs.
                              1998      1997      1996    1997  1996
                            --------- --------- --------- ----  -----
<S>                         <C>       <C>       <C>       <C>   <C>
Noninterest Bearing
  Commercial..............  $ 1,658.2 $ 1,499.5 $ 1,370.0 10.6%   9.5%
  Personal................      508.9     452.3     432.6 12.5    4.6
  Other...................      378.6     349.3     313.6  8.4   11.4
                            --------- --------- --------- ----  -----
Total Noninterest Bearing
 Deposits.................    2,545.7   2,301.1   2,116.2 10.6    8.7
Interest Bearing
  Savings and NOW.........    2,140.4   1,915.9   1,905.8 11.7    0.5
  Money Market............    4,135.1   3,022.9   2,597.7 36.8   16.4
  Other CDs & Time........    4,388.2   3,665.4   3,344.6 19.7    9.6
  CDs Greater than
   $100,000...............      816.5     703.9     647.6 16.0    8.7
  Brokered CDs............      731.3     630.6     285.6 16.0  120.8
                            --------- --------- --------- ----  -----
Total Interest Bearing
 Deposits.................   12,211.5   9,938.7   8,781.3 22.9   13.2
                            --------- --------- --------- ----  -----
Total Consolidated Average
 Deposits.................  $14,757.2 $12,239.8 $10,897.5 20.6%  12.3%
                            ========= ========= ========= ====  =====
</TABLE>
 
  Money market savings exhibited the greatest growth when comparing average
deposits in 1998 to average deposits in 1997. Average Money Market savings
increased $1.1 billion in 1998 over 1997, of which, approximately $0.6 billion
of the increase is attributable to the Security merger.
 
  The increase in Other CD's & Time in 1998 compared with 1997 reflects, in
part, issuance of Callable CD's to customers and a $300.4 million or 121.4%
increase in foreign time deposits, primarily eurodollar deposits.
 
  The Corporation has a brokered CD program to acquire longer-term CDs with
maturities of one year or more in order to provide a stable source of funds
that over time is less costly than Bank Notes. During the second quarter of
1997, the Corporation began issuing brokered CDs that are callable at the
option of the Corporation. Concurrently with the callable issues, the
Corporation entered into receive fixed interest rate swaps which are callable
at the option of the counterparties. The call provisions are generally
exercisable one year after issuance. Brokered callable CDs averaged $254.6
million and $34.2 million in 1998 and 1997, respectively, and amounted to
$278.2 million and $124.8 million at December 31 of those years. The brokered
callable CDs together with the interest rate swaps, provide term liquidity at
rates below LIBOR.
 
  During 1997, M&I disposed of seven branches. Deposits and loans aggregating
approximately $64 million and $5 million, respectively were divested in 1997.
As part of the Corporation's banking initiatives, certain bank branches were
voluntarily divested of during the second half of 1996. Such branches disposed
of in 1996 had combined deposits and loans of approximately $26 million and
$14 million, respectively.
 
  The net interest margin (FTE) as a percent of average earning assets was
3.69% in 1998 compared to 3.94% in 1997, a decrease of 25 basis points. The
yield on earning assets decreased 26 basis points from 7.94% in 1997 to 7.68%
in 1998 while the cost of interest bearing liabilities decreased 6 basis
points from 4.91% in 1997 to 4.85% in 1998.
 
  The yield on loans, leases and securitized ARMs was 8.09% in 1998 compared
to 8.36% in 1997, a decrease of 27 basis points. The decline in yield
reflects, in part, continued run-off of higher yielding loans and securitized
ARMs as well as accelerated amortization of purchase accounting premiums
assigned to acquired loans due to prepayments and refinancings in response to
the interest rate environment. Excluding the effects of the premium
amortization, the yields on loans, leases and securitized ARMs would have been
8.17% and 8.36% in 1998 and 1997, respectively. Premium amortization
associated with Security purchase accounting adjustments for fixed rate
mortgage and home equity loans amounted to $11.2 million in 1998 compared to
$0.7 million in 1997. Net
 
                                      18
<PAGE>
 
interest income may continue to be adversely affected if the current
prepayment experience continues. Loan and lease growth offset the yield
decline and netted approximately $187.8 million or 87% of the increase in
interest on earning assets.
 
  The remaining increase in interest on earning assets is primarily
attributable to investment securities. The total yield on the investment
security portfolio, excluding securitized ARMs, decreased by approximately 27
basis points in 1998 compared to 1997 reducing interest income by $11.9
million; however, the average balance of such investment securities, excluding
fair value adjustments for securities available for sale, increased $585.5
million or 15.3% increasing interest income by $39.9 million. Premium
amortization associated with Security purchase accounting adjustments for
investment securities was $7.9 million in 1998 compared to $1.4 million in
1997.
 
  The net yield on interest earning assets was 3.80% in 1998 and 3.96% in 1997
excluding the Security purchase accounting premium amortization.
 
  The increase in the volume of interest bearing deposits accounted for $100.4
million or 76.0% of the increase in interest paid on interest bearing
liabilities in 1998. The decrease in cost of borrowings was offset by the
increase in the average balance resulting in a net reduction to the interest
margin of $28.1 million.
 
  At December 31, 1998, the Corporation had $725 million in notional amount of
standard receive fixed/pay floating interest rate swaps, $25 million in
notional amount of an interest rate floor and $25 million in notional amount
of an interest rate cap designated as hedges against the interest rate
volatility associated with variable rate loans, variable rate deposits and
variable rate debt. In addition the Corporation had $292 million of notional
value of receive fixed/pay floating rate swaps designated as hedges to offset
fixed rate callable CDs.
 
  For 1998, the effect on net interest income and the yield on interest
earning assets resulting from the swaps, net of cap and floor premium
amortization, was a positive $5.13 million and 3 basis points, respectively,
compared with a positive $2.62 million and 2 basis points, respectively, in
1997.
 
  In late December, 1998, the Corporation purchased $400.0 million of single
premium bank-owned life insurance policies which insure the lives of certain
officers and employees. The Corporation is utilizing this vehicle to fund
future employee benefit obligations. These purchases were funded by the
maturities and sales of investment securities classified as available for
sale. The net realizable values of bank-owned life insurance policies are a
component of other assets in the consolidated balance sheets and periodic
increases in the values are included as a component of other income. These
transactions have the effect of reducing the Corporation's net interest income
(and margin) and increasing its other income. The balance at December 31, 1997
of $54.9 million represents bank-owned life insurance acquired in the Security
merger.
 
  Net interest income in 1997 amounted to $594.5 million, an increase of $58.7
million or 11.0% compared with net interest income of $535.8 million in 1996.
 
  Average earning assets in 1997 amounted to $15.7 billion compared to $13.5
billion in 1996, an increase of $2.2 billion or 16.2%. Average loans and
leases, excluding the effect of securitizing ARMs increased $1.6 billion or
15.8% of which, approximately $580 million is attributable to the Security
merger. The remaining growth in average earning assets was primarily
attributable to investment securities. Approximately $280 million of the
growth is attributable to the Security merger while the remainder reflects the
Corporation's intent to increase the portfolio size with higher yielding and
longer-term securities to adjust the rate sensitivity and leverage of the
consolidated balance sheet. During 1997, the Corporation's banking affiliates
repositioned investment securities through the sale and purchase of
approximately $400 million of securities available for sale.
 
  Average interest bearing liabilities increased $1.9 billion or 17.8% in 1997
compared to 1996. Average interest bearing deposits increased $1.2 billion or
13.2%. Average short-term borrowings increased $799.7 million while average
long-term borrowings decreased $35.6 million. Average noninterest bearing
deposits increased $184.9 million or 8.7% in 1997 compared to the prior year.
The Security merger accounted for approximately $590 million of the growth in
average deposits, $43 million of the growth in average short-term borrowings
and increased average long-term borrowings by approximately $116 million.
 
                                      19
<PAGE>
 
  The net interest margin (FTE) as a percent of average earning assets was
3.94% in 1997 compared to 4.09% in 1996, a decrease of 15 basis points. The
yield on earning assets increased 7 basis points from 7.87% in 1996 to 7.94%
in 1997 while the cost of interest bearing liabilities increased 20 basis
points from 4.71% in 1996 to 4.91% in 1997.
 
  The yield on loans, leases and securitized ARMs decreased 5 basis points in
1997 compared to 1996. Loan and lease growth offset the yield decline and
contributed approximately $132.8 million or 73% of the increase in interest on
earning assets.
 
  The remaining increase in interest on earning assets is primarily
attributable to investment securities. The total yield on the investment
security portfolio, excluding securitized ARMs, increased by approximately 43
basis points in 1997 compared to 1996 and the average balance of such
investment securities, excluding fair value adjustments for securities
available for sale, increased $557.0 million or 17.0%.
 
  The increase in the volume and cost of interest bearing deposits accounted
for $67.9 million or 59% of the increase in interest paid on interest bearing
liabilities in 1997. The decrease in volume of long-term borrowings was offset
by the increase in cost resulting in a net increase in interest paid of $0.6
million. The average cost of short-term borrowings increased 27 basis points
and together with the increase in average volume accounted for $47.3 million
of the increase in interest paid on interest bearing liabilities.
 
  As more fully described in Note 12 to the Consolidated Financial Statements
contained in Item 8 herein, in December 1996 the Corporation formed a Trust
and issued $200 million of 7.65% cumulative preferred capital securities. For
financial statement purposes, the capital securities are classified as long-
term borrowings and the distributions as interest expense that caused, in
part, the average cost of long-term borrowings to increase in 1997 compared to
1996.
 
                                      20
<PAGE>
 
          Average Balance Sheets and Analysis of Net Interest Income
 
  The Corporation's consolidated average balance sheets, interest earned and
interest paid, and the average interest rates earned and paid for each of the
last three years are presented in the following table. Securitized ARM loans
that are classified as investment securities available for sale are included
with loans and leases to provide a more meaningful comparison ($ in
thousands):
 
<TABLE>
<CAPTION>
                                       1998                            1997                            1996
                          ------------------------------- ------------------------------- -------------------------------
                                                  Average                         Average                         Average
                                                   Yield                           Yield                           Yield
                                        Interest    or                  Interest    or                  Interest    or
                            Average     Earned/    Cost     Average     Earned/    Cost     Average     Earned/    Cost
                            Balance       Paid      (3)     Balance       Paid      (3)     Balance       Paid      (3)
                          -----------  ---------- ------- -----------  ---------- ------- -----------  ---------- -------
<S>                       <C>          <C>        <C>     <C>          <C>        <C>     <C>          <C>        <C>
Loans, leases, and
 securitized ARMs (1,2).  $14,322,551  $1,156,569  8.09%  $11,597,804  $  968,788  8.36%  $10,013,023  $  841,419  8.41%
Investment securities:
 Taxable................    3,398,414     211,562  6.26     2,952,034     194,481  6.62     2,620,503     164,098  6.29
 Tax exempt (1).........    1,078,333      77,212  7.44       913,130      66,372  7.40       668,913      44,984  6.76
Interest bearing
 deposits in other
 banks..................       28,704       1,466  5.11        28,838       1,527  5.30        28,767       1,505  5.23
Funds sold and security
 resale agreements......       38,738       2,218  5.73        89,809       5,091  5.67        73,104       4,193  5.74
Trading securities (1)..       43,404       2,225  5.13        40,822       2,046  5.01        25,264       1,221  4.83
Other short-term
 investments............      179,607       8,982  5.00        87,648       4,880  5.57        86,211       4,465  5.18
                          -----------  ----------  ----   -----------  ----------  ----   -----------  ----------  ----
   Total interest
    earning assets......   19,089,751   1,460,234  7.68%   15,710,085   1,243,185  7.94%   13,515,785   1,061,885  7.87%
Cash and demand deposits
 due from banks.........      652,988                         614,824                         586,985
Premises and equipment,
 net....................      357,040                         334,617                         316,382
Other assets............      906,850                         516,413                         393,421
Allowance for loan and
 lease losses...........     (216,456)                       (174,525)                       (166,886)
                          -----------                     -----------                     -----------
   Total assets.........  $20,790,173                     $17,001,414                     $14,645,687
                          ===========                     ===========                     ===========
Savings and interest
 bearing demand
 deposits...............  $ 6,275,523  $  227,795  3.63%  $ 4,938,832  $  171,511  3.47%  $ 4,503,507  $  146,935  3.26%
Other time deposits.....    4,388,152     246,768  5.62     3,665,334     209,651  5.72     3,344,644     191,557  5.73
CDs greater than $100,
 brokered and callable
 CDs....................    1,547,816      89,977  5.81     1,334,532      79,256  5.94       933,164      53,981  5.78
                          -----------  ----------  ----   -----------  ----------  ----   -----------  ----------  ----
Total interest bearing
 deposits...............   12,211,491     564,540  4.62     9,938,698     460,418  4.63     8,781,315     392,473  4.47
Short-term borrowings...    2,357,161     126,624  5.37     2,017,829     111,193  5.51     1,218,177      63,892  5.24
Long-term borrowings....    1,046,321      66,810  6.39       787,819      54,175  6.88       823,397      53,615  6.51
                          -----------  ----------  ----   -----------  ----------  ----   -----------  ----------  ----
   Total interest
    bearing liabilities.   15,614,973     757,974  4.85%   12,744,346     625,786  4.91%   10,822,889     509,980  4.71%
Noninterest bearing
 deposits...............    2,545,724                       2,301,097                       2,116,197
Other liabilities.......      496,439                         399,605                         331,743
Shareholders' equity....    2,133,037                       1,556,366                       1,374,858
                          -----------                     -----------                     -----------
   Total liabilities and
    shareholders'
    equity..............  $20,790,173                     $17,001,414                     $14,645,687
                          ===========                     ===========                     ===========
   Net interest income..               $  702,260                      $  617,399                      $  551,905
                                       ==========                      ==========                      ==========
   Net yield on interest
    earning assets......                           3.69%                           3.94%                           4.09%
                                                   ====                            ====                            ====
</TABLE>
- -------
Notes:
(1) Fully taxable equivalent basis, assuming a Federal income tax rate of 35%
    for all years presented, and excluding disallowed interest expense.
(2) Loans and leases on nonaccrual status have been included in the
    computation of average balances.
(3) Based on average balances excluding fair value adjustments for available
    for sale securities.
 
                                      21
<PAGE>
 
          Analysis of Changes in Interest Income and Interest Expense
 
  The effect on interest income and interest expense due to volume and rate
changes in 1998 and 1997 are outlined in the following table. Changes not due
solely to either volume or rate are allocated to rate ($ in thousands):
<TABLE>
<CAPTION>
                                1998 versus 1997                1997 versus 1996
                         ------------------------------- -------------------------------
                         Increase (Decrease)             Increase (Decrease)
                          due to Change in                due to Change in
                         -------------------             -------------------
                          Average   Average    Increase   Average   Average    Increase
                         Volume (2)   Rate    (Decrease) Volume (2)   Rate    (Decrease)
                         ---------- --------  ---------- ---------- --------  ----------
<S>                      <C>        <C>       <C>        <C>        <C>       <C>
Interest on earning
 assets:
  Loans, leases, and
   securitized
   ARMs (1).............  $227,138  $(39,357)  $187,781   $132,753  $(5,384)   $127,369
Investment securities:
  Taxable...............    29,393   (12,312)    17,081     20,517     9,866     30,383
  Tax-exempt (1)........    10,469       371     10,840     15,602     5,786     21,388
Interest bearing
 deposits in other
 banks..................        (7)      (54)      ( 61)         4        18         22
Funds sold and security
 resale agreements......    (2,896)       23     (2,873)       959       (61)       898
Trading securities (1)..       129        50        179        751        74        825
Other short-term
 investments............     5,122    (1,020)     4,102         74       341        415
                          --------  --------   --------   --------  --------   --------
    Total interest
     income change......  $269,348  $(52,299)  $217,049   $170,660  $ 10,640   $181,300
                          ========  ========   ========   ========  ========   ========
Expense on interest
 bearing liabilities:
  Savings and interest
   bearing demand
   deposits.............  $ 46,383  $  9,901   $ 56,284   $ 14,192  $ 10,384   $ 24,576
  Other time deposits...    41,345    (4,228)    37,117     18,376      (282)    18,094
  CDs greater than $100,
   brokered and callable
   CDs..................    12,669    (1,948)    10,721     23,199     2,076     25,275
                          --------  --------   --------   --------  --------   --------
  Total interest bearing
   deposits.............   100,397     3,725    104,122     55,767    12,178     67,945
  Short-term borrowings.    18,697    (3,266)    15,431     41,902     5,399     47,301
  Long-term borrowings..    17,785    (5,150)    12,635     (2,316)    2,876        560
                          --------  --------   --------   --------  --------   --------
    Total interest
     expense change.....  $136,879  $ (4,691)  $132,188   $ 95,353  $ 20,453   $115,806
                          ========  ========   ========   ========  ========   ========
</TABLE>
- --------
Notes:
(1) Fully taxable equivalent basis, assuming a Federal income tax rate of 35%
    for all years presented, and excluding disallowed interest expense.
(2) Based on average balances excluding fair value adjustments for available
    for sale securities.
 
            Provision for Loan and Lease Losses and Credit Quality
 
  Nonperforming assets at December 31, 1998, were $118.7 million compared to
$92.1 million at December 31, 1997, an increase of $26.6 million or 28.9%.
Nonperforming assets at December 31, 1996 were $80.7 million. At the time of
merger, Security had nonperforming assets of approximately $5.5 million, of
which, approximately $5.0 million was nonaccrual residential real estate
loans. Nonaccrual loans and leases, the largest component of nonperforming
assets increased $34.4 million since year-end 1997 and increased $37.9 million
since December 31, 1996. Renegotiated loans and leases at December 31, 1998
were $1.0 million compared to $1.3 million at December 31, 1997. Loans and
leases past due 90 days or more were $7.6 million at the end of 1998 compared
to $8.2 million at the end of 1997. Other real estate owned amounted to $8.8
million at December 31, 1998, compared to $15.6 million at December 31, 1997,
and $8.1 million at December 31, 1996. At December 31, 1998, 1997, and 1996,
approximately $3.2 million, $11.7 million and $2.2 million, respectively, of
other real estate consisted of closed branch facilities. The increase in 1997
is attributable to the Security merger. The majority of Security's branch and
operations facilities were closed due to customer service and operating
overlap.
 
                                      22
<PAGE>
 
  Throughout 1998, the balance of loans placed on nonaccrual have been
increasing. In addition, in the fourth quarter of 1998, one larger commercial
loan totaling $25.9 million was placed on nonaccrual. Nonaccrual loans secured
by real estate increased $9.5 million compared to 1997. Commercial real estate
loans on nonaccrual accounted for $6.9 million and residential real estate
loans, including home equity, accounted for $2.0 million of the increase.
Nonaccrual lease financing receivables and personal loans decreased compared
to the prior year.
 
  Net charge-offs in 1998 amounted to $9.7 million or .07% of average loans
and leases compared to $13.4 million or .12% of average loans and leases in
1997. Excluding one large recovery in 1998, net charge-offs would have been
$14.0 million or .10% of average loans which is consistent with the prior
year. Net charge-offs in the fourth quarter of 1998 amounted to $5.2 million.
 
                    Consolidated Credit Quality Information
                             December 31, ($000's)
 
<TABLE>
<CAPTION>
                                 1998      1997      1996      1995      1994
                               --------  --------  --------  --------  --------
<S>                            <C>       <C>       <C>       <C>       <C>
Nonperforming Assets by Type
Loans and Leases:
  Nonaccrual.................  $101,346  $ 66,945  $ 63,459  $ 52,972  $ 47,842
  Renegotiated...............       978     1,338     1,819     3,087     4,172
  Past Due 90 Days or More...     7,631     8,238     7,366     8,184     9,093
                               --------  --------  --------  --------  --------
  Total Nonperforming Loans
   and Leases................   109,955    76,521    72,644    64,243    61,107
Other Real Estate Owned......     8,751    15,573     8,052    11,103    14,720
                               --------  --------  --------  --------  --------
    Total Nonperforming
     Assets..................  $118,706  $ 92,094  $ 80,696  $ 75,346  $ 75,827
                               ========  ========  ========  ========  ========
Allowance for Loan and Lease
 Losses......................  $226,052  $208,651  $161,659  $166,815  $159,506
                               ========  ========  ========  ========  ========
Consolidated Statistics
Net Charge-offs to Average
 Loans and Leases............      0.07%     0.12%     0.21%     0.10%     0.06%
Total Nonperforming Loans and
 Leases to Total Loans and
 Leases......................      0.79      0.58      0.74      0.68      0.66
Total Nonperforming Assets to
 Total Loans and Leases and
 Other Real Estate Owned.....      0.85      0.70      0.82      0.80      0.82
Allowance for Loan and Lease
 Losses to Total Loans and
 Leases......................      1.62      1.59      1.64      1.78      1.72
Allowance for Loan and Lease
 Losses to Nonperforming
 Loans and Leases............       206       273       223       260       261
</TABLE>
 
                                      23
<PAGE>
 
           Major Categories of Nonaccrual Loans and Leases ($000's)
 
<TABLE>
<CAPTION>
                              December 31, 1998           December 31, 1997
                          --------------------------- ---------------------------
                                     % of                        % of
                                     Loan     % of               Loan     % of
                          Nonaccrual Type  Nonaccrual Nonaccrual Type  Nonaccrual
                          ---------- ----  ---------- ---------- ----  ----------
<S>                       <C>        <C>   <C>        <C>        <C>   <C>
Commercial
Commercial...............  $ 39,131  1.0%     38.6%    $12,431   0.4%     18.5%
Lease Financing
 Receivables.............     2,895  0.5       2.9       3,855   0.8       5.8
                           --------  ---     -----     -------   ---     -----
    Total Commercial.....    42,026  0.9      41.5      16,286   0.4      24.3
Real Estate
Construction and Land
 Development.............     1,952  0.5       1.9       1,329   0.3       2.0
Commercial Real Estate...    21,586  0.6      21.3      14,696   0.4      22.0
Residential Real Estate..    33,117  0.8      32.7      31,117   0.8      46.5
                           --------  ---     -----     -------   ---     -----
    Total Real Estate....    56,655  0.7      55.9      47,142   0.6      70.5
Personal.................     2,665  0.2       2.6       3,517   0.3       5.2
                           --------  ---     -----     -------   ---     -----
    Total................  $101,346  0.7%    100.0%    $66,945   0.5%    100.0%
                           ========  ===     =====     =======   ===     =====
</TABLE>
 
  Reconciliation of Consolidated Allowance for Loan and Lease Losses ($000's)
 
<TABLE>
<CAPTION>
                                   1998     1997     1996      1995      1994
                                 -------- -------- --------  --------  --------
<S>                              <C>      <C>      <C>       <C>       <C>
Allowance for Loan and Lease
 Losses at Beginning
 of Year........................ $208,651 $161,659 $166,815  $159,506  $138,723
Provision for Loan and Lease
 Losses.........................   27,090   17,633   15,634    16,558    25,627
Allowance of Banks Acquired.....      --    42,773      --      2,843       518
Allowance Transfer for Loan
 Securitizations................      --       --      (440)   (2,275)      --
Loans and Leases Charged-off:
  Commercial....................    6,401    8,474   16,294     5,225     3,362
  Real Estate--Construction.....      352       87       13       407       737
  Real Estate--Mortgage.........    5,115    3,907    3,446     2,914     4,060
  Personal......................    7,886    7,868    6,390     5,783     4,410
  Leases........................    1,191    1,166    2,397       875       907
                                 -------- -------- --------  --------  --------
Total Charge-offs...............   20,945   21,502   28,540    15,204    13,476
Recoveries on Loans and Leases:
  Commercial....................    6,708    4,176    3,231     2,123     3,682
  Real Estate--Construction.....      164       53        9        39         6
  Real Estate--Mortgage.........    1,369    1,097    2,483     1,035     2,556
  Personal......................    2,690    2,501    2,355     2,167     1,793
  Leases........................      325      261      112        23        77
                                 -------- -------- --------  --------  --------
Total Recoveries................   11,256    8,088    8,190     5,387     8,114
                                 -------- -------- --------  --------  --------
Net Loans and Leases Charged-
 off............................    9,689   13,414   20,350     9,817     5,362
                                 -------- -------- --------  --------  --------
Allowance for Loan and Lease
 Losses at End of Year.......... $226,052 $208,651 $161,659  $166,815  $159,506
                                 ======== ======== ========  ========  ========
</TABLE>
 
  The amount of the provision for loan and lease losses charged to operating
expense for the year ended December 31, 1998, is the amount necessary to bring
the allowance for loan and lease losses at December 31, 1998, to a level
believed adequate by management to absorb current estimated probable losses in
the loan and lease portfolio. To serve as a basis for determining the
provision, M&I maintains an extensive credit risk monitoring process that
considers several factors including: current economic conditions affecting
loan and lease
 
                                      24
<PAGE>
 
customers, the payment performance of individual large loans and pools of
homogeneous small loans, portfolio seasoning, changes in collateral values,
and detailed reviews of specific large loan and lease relationships. For large
loans deemed to be impaired due to an expectation that all contractual
payments will probably not be received, impairment is measured by comparing
the recorded investment in the loan to the loans effective interest rate, the
fair value of the collateral or the loans observable market price.
 
  The provision for loan and lease losses amounted to $27.1 million in 1998,
$17.6 million in 1997, and $15.6 million in 1996. The increase in the
provision in 1998 reflects the increase in nonaccrual loans throughout the
year, increased net charge-off levels in the fourth quarter of 1998 (.15% of
average loans), increased diversity in the loan portfolio (loan type and
geographical presence), the impact of Asian and Latin American economies on
selected customers and maintenance of risk-based reserve coverage. See
"Summary of Loan and Lease Loss Experience" contained in Item 1, Part 1 for
additional discussion.
 
                                 Other Income
 
  Total noninterest income amounted to $756.3 million in 1998 compared to
$608.5 million in 1997, an increase of $147.8 million or 24.3%.
 
  Fees from data processing services increased $68.8 million or 20.0% from
$343.8 million in 1997 to $412.6 million in 1998. Processing fees in 1998
increased $41.0 million or 17.1% over 1997. Software revenue increased $17.6
million or 33.5%. Conversion fees increased $7.1 million. Buyout fees, which
vary from year to year, increased $2.9 million. Fees from other services such
as contract programming and consulting were relatively unchanged. Revenue
growth levels in 1999 may be below historical patterns due to the loss of a
significant customer because of an acquisition, and general reluctance of
potential customers to change their information processing or application
systems with year 2000 rapidly approaching.
 
  Fees from trust services were $88.5 million in 1998 compared to $78.6
million in 1997, an increase of $9.9 million or 12.6%. Personal trust fees
increased 6.8%, or $2.8 million, while all other major categories experienced
revenue growth in excess of 13% over the prior year. Commercial trust fees
increased $3.8 million and outsourcing fees increased $1.4 million.
 
  Fees for other customer services increased $19.1 million or 14.3% from 1997
and amounted to $152.8 million in 1998. Fee income from loans increased $11.3
million due in part to increased loan prepayment penalties and fees received
on fixed rate loans sold in the secondary market. Service charges on deposits
increased $3.8 million. Credit card, debit card and ATM fees increased $3.0
million and brokerage, insurance and annuity fees increased $2.4 million.
 
  Net securities gains in 1998 amounted to $30.8 million. The Corporation's
Capital Markets Group had net realized gains from their security portfolio of
$23.6 million. Also during 1998, the Corporation and its banking affiliates
had net securities gains of $7.2 million from the sale of equity securities
and debt securities available for sale.
 
  Other miscellaneous income amounted to $71.7 million in 1998 compared to
$48.2 million in 1997, an increase of $23.5 million. Gains from the sale of
mortgage loans increased $21.7 million in 1998 and amounted to $34.2 million.
Deposit premiums from sales of bank branches of $7.6 million in 1997 were
offset by increases in gains on sales of fixed assets and earnings on funded
deferred compensation plans. The increase in the net realizable value for
bank-owned life insurance policies amounted to $3.9 million in 1998 compared
to $0.8 million in 1997.
 
  Total noninterest income amounted to $608.5 million in 1997 compared to
$511.3 million in 1996, an increase of $97.2 million or 19.0%.
 
                                      25
<PAGE>
 
  Fees from data processing services increased $75.3 million or 28.0% from
$268.5 million in 1996 to $343.8 million in 1997. Processing fees increased
$55.4 million or 30.2%. Conversion revenue of $14.1 million was relatively
unchanged. Fees from other services such as contract programming and
consulting increased $3.3 million and software revenue increased $11.5 million
or 28.2%. Buyout fees, which vary from year to year, increased $5.1 million
and amounted to $11.3 million in 1997.
 
  Fees from trust services were $78.6 million in 1997 compared to $70.2
million in 1996, an increase of $8.4 million or 12.0%. All major categories
experienced revenue growth in excess of 10% over the prior year. Personal
trust fees increased $4.1 million and commercial trust fees increased $2.8
million.
 
  Fees for other customer services increased $11.1 million or 9.0%. Service
charges on deposits increased $3.1 million and amounted to $57.9 million in
1997. Credit card, debit card and ATM fees of $25.1 million in 1997 increased
$2.4 million. Brokerage and insurance fees increased $2.6 million.
 
  Net securities gains in 1997 amounted to $4.1 million. During 1997 the
Corporation's Capital Markets Group had net realized securities gains of $6.7
million. Also during 1997, the Corporation's banking affiliates had net
securities losses of $4.4 million from the sale of available for sale
investment securities as previously discussed and the Corporation had net
securities gains of $1.8 million from the sale of equity securities.
 
  Other miscellaneous income amounted to $48.2 million in 1997 compared to
$34.5 million in 1996, an increase of $13.7 million. Deposit premiums from
sales of bank branches were $7.6 million in 1997 compared to $1.5 million in
1996. Gains from the sale of mortgage loans increased $4.5 million in 1997 and
amounted to $12.6 million. Foreign exchange revenue increased $1.1 million in
1997 compared to the prior year.
 
                                 Other Expense
 
  Total other expense before merger/restructuring charges amounted to $916.7
million in 1998, an increase of $119.5 million or 15.0% from $797.2 million in
1997. Including these charges, total other expense for 1998 amounted to $940.0
million. Total other expense, before special charges, amounted to $689.6
million in 1996. See Note 3 to the Consolidated Financial Statements contained
in Item 8 for a description of the 1998 merger/restructuring charges.
 
  The increase in expenses is primarily attributable to the Corporation's
nonbanking businesses, particularly its data processing business segment
("Data Services"). Data Services expense growth of $70.6 million or 19.3% in
1998 compared to 1997 represents approximately 59% of the Corporations total
operating expense growth and reflects the cost of adding processing capacity
and other related costs associated with increased revenue growth as well as
continued work on Year 2000. See "Year 2000" for additional discussion of the
activities and costs related to this project.
 
  Expenses of the Corporation's banking business in 1997 included the cost of
integrating Security into M&I. M&I added approximately 400 full-time
equivalent employees as a direct result of the merger excluding job
opportunities offered former Security employees for open job positions that
existed prior to the merger. In total, it is estimated that 570 M&I positions
were filled by former Security employees. At the time of merger, Security
employed approximately 850 employees on a full-time equivalent basis. During
the fourth quarter of 1997, many former Security employees were temporarily
retained to assist in implementing systems and operations conversions,
attending to special customers needs and other issues to ensure that the
integration was as effective and efficient as possible.
 
  The merger with Security was an in-market acquisition which entailed a
significant amount of customer service and operating overlap. The Corporation
closed the majority of Security's branch and operating facilities in addition
to the reduction in work force described above resulting in lower operating
expenses.
 
  Expenses of the Corporation's banking business in 1996 include the cost of
implementing certain initiatives in the areas of retail and small business
lending, loan and deposit operational support consolidation and product
 
                                      26
<PAGE>
 
and service distribution networks. These initiatives will enable more
competitive pricing and achieve improved cost efficiencies. In 1996, these
banking initiative expenses amounted to $4.7 million.
 
  Expense control is sometimes measured in the financial services industry by
the efficiency ratio statistic. The efficiency ratio is calculated by taking
total other expense (excluding special charges) divided by the sum of total
other income (excluding securities gains or losses other than for the Capital
Markets Group) and net interest income on a fully taxable equivalent basis.
The Corporation's efficiency ratios for the years ended December 31, 1998,
1997, and 1996 were:
 
 
<TABLE>
<CAPTION>
                         Efficiency Ratios                     1998  1997  1996
      -------------------------------------------------------- ----  ----  ----
      <S>                                                      <C>   <C>   <C>
      Consolidated Corporation................................ 63.2% 64.9% 64.6%
      Consolidated Corporation Excluding Data Services:
        Including Intangible Amortization..................... 53.1% 56.1% 56.8%
        Excluding Intangible Amortization..................... 48.5% 54.3% 55.8%
</TABLE>
 
  Total salaries and benefits expense amounted to $523.6 million for 1998
compared to $460.2 million in 1997, an increase of $63.4 million or 13.8%. The
data processing business contributed approximately $42.5 million or 67% of the
increase. During 1998, Data Services had average full-time equivalent
employees and contract programmers of 3,926 compared to 3,496 in the prior
year. Salaries and benefits of the Corporation's residential mortgage banking
group increased $3.7 million or 41.9%. Loan production in 1998 was $3.4
billion, an increase of 120% from last year. Salaries and benefits for Trust
Services increased $5.5 million or 16.6% compared to 1997 which reflects
increased costs for outsourcing and other services associated with revenue
growth.
 
  Net occupancy and equipment expenses increased $17.8 million in 1998 when
compared to 1997. Data Services activity resulted in approximately $13.7
million or 77% of the 1998 increase in occupancy and equipment costs.
Additional depreciation and maintenance associated with equipment additions
and telecommunications equipment and charges accounted for $11.9 million of
Data Services' increase.
 
  Software expense amounted to $22.2 million in 1998 compared to $19.7 million
in 1997, an increase of $2.5 million or 12.6%. This increase is primarily
related to Data Services growth which accounted for $1.4 million of the
increase. Data Services growth consisted of additional and more costly
operating software associated with CPU upgrades as well as additional
application software including software used for the Year 2000 project.
 
  Professional services increased $8.0 million or 46% over 1997. Data Services
accounted for $2.6 million of the increase. Banking and all others accounted
for the remainder of the increase.
 
  Amortization of intangibles increased $22.1 million primarily as a result of
the Security transaction and accelerated amortization of mortgage servicing
rights due to prepayments associated with refinancings.
 
  Other expenses amounted to $106.9 million in 1998 compared to $104.2 million
in the prior year, an increase of $2.7 million or 2.6%.
 
  Other expense is affected by the capitalization of costs, net of
amortization, associated with software development and data processing
conversions. The amount of capitalized software development costs and
capitalized conversion costs net of their respective amortization declined
$3.3 million and $1.4 million in 1998 compared to 1997. During 1997,
capitalized software impairment writedowns amounted to $2.4 million.
 
  Total other expense amounted to $797.2 million in 1997, an increase of
$107.6 million or 15.6% from $689.6 million in 1996 before the three special
charges as previously discussed. Including these special charges, total other
expense for 1996 amounted to $713.5 million.
 
                                      27
<PAGE>
 
  Total salaries and benefits expense amounted to $460.2 million for 1997
compared to $392.7 million in 1996, an increase of $67.5 million or 17.2%. The
data processing business contributed approximately $46.6 million or 69% of the
increase. During 1997, Data Services had average full-time equivalent
employees and contract programmers of 3,496 compared to 2,810 in the prior
year.
 
  Net occupancy and equipment expenses increased $10.0 million in 1997 when
compared to 1996. Data Services activity resulted in substantially all of this
increase. Additional depreciation and maintenance associated with equipment
additions and telecommunications equipment and charges accounted for $8.1
million of Data Services' increase. Also during 1997, Data Services completed
a 160,000 square foot facility in addition to upgrades to its existing
facilities.
 
  Software expense amounted to $19.7 million in 1997 compared to $15.2 million
in 1996, an increase of $4.5 million or 29.4%. This increase is primarily
related to Data Services growth which accounted for $3.8 million of the
increase. Data Services growth consisted of additional and more costly
operating software associated with CPU upgrades as well as additional
application software including software used for the Year 2000 project.
 
  As previously discussed, the Corporation paid $7.1 million in one-time SAIF
assessments in 1996 which is the primary reason for the decline in payments to
regulatory agencies in 1997 compared to 1996.
 
  Processing charges expense increased $5.5 million or 28.1% from $19.8
million in 1996 to $25.3 million in 1997. Both banking and Data Services
experienced increased costs in processing charges.
 
  Amortization of intangible assets increased $2.5 million in 1997 over 1996
due to an additional $8.0 million expense as a result of the Security
transaction in 1997 which was partially offset by a $4.7 million special, one-
time writedown of intangible assets in 1996 by Advantage Bancorp.
 
  Other expenses amounted to $104.2 million in 1997 compared to $103.7 million
in the prior year, an increase of $0.5 million. Excluding the $12.1 million
write-off of acquired in-process technology attributable to the EastPoint
acquisition in 1996, other expenses increased $12.6 million in 1997 when
compared to the prior year. Other operating expenses associated with Data
Services revenue growth increased $8.4 million. Customer related expense for
banking increased $2.2 million in 1997 compared with 1996. Lease buyouts and
writedowns associated with branch closures decreased $0.8 million.
 
  Other expense is also affected by the capitalization of costs, net of
amortization, associated with software development and customer data
processing conversions. The amount of capitalized software development costs,
net of amortization and impairment writedowns, increased $6.9 million in 1997
compared to the prior year. The impact of capitalized customer conversion
activity, net of amortization, declined $2.2 million as customers continue to
pay for conversions upfront. Capitalized software costs are amortized over
their estimated useful lives. Despite the Corporation's monitoring of its
ability to recover its investment in software, the ever increasing change in
technology increases the possibility of obsolescence and may necessitate
impairment writedowns. As previously discussed, capitalized software
impairment writedowns were $2.4 million in 1997.
 
                             Income Tax Provision
 
  The provision for income taxes was $164.0 million in 1998, $131.5 million in
1997 and $111.3 million in 1996. The effective tax rate in 1998 was 35.2%
compared to 33.9% in 1997 and 35.0% in 1996. The increase in the effective tax
rate in 1998 is due, in part, to the increase in amortization and elements of
the merger/restructuring charge which are not deductible for income tax
purposes.
 
                               Capital Resources
 
  Shareholders' equity was $2.24 billion or 10.40% of total consolidated
assets at December 31, 1998, compared to $2.02 billion or 9.86% of total
consolidated assets at December 31, 1997. Earnings, net of dividends paid, was
the major source of the increase.
 
                                      28
<PAGE>
 
  The Corporation and its affiliates continue to have a strong capital base
and the Corporation's regulatory capital ratios continue to be significantly
above the defined minimum regulatory ratios. See Note 13 to the Consolidated
Financial Statements contained in Item 8 herein for the Corporation's
comparative capital ratios and the capital ratios of its significant
subsidiaries.
 
  The Corporation's subsidiaries, primarily its banking subsidiaries, are
restricted by regulations from making distributions above prescribed amounts.
In addition, banking subsidiaries are limited in making loans and advances to
the Corporation. At December 31, 1998, approximately $69.9 million and $69.3
million were available for distribution without regulatory approval from the
Corporation's banking and nonbanking subsidiaries, respectively.
 
  Under Federal Reserve Board policy, the Corporation is expected to act as a
source of financial strength to each subsidiary bank in circumstances when it
might not do so absent such policy.
 
  In April 1997, $16.8 million of 8.5% convertible subordinated notes were
converted into 1,922,114 shares of common stock. As provided for in the note
agreement, the noteholder subsequent to conversion, exchanged the common
shares acquired by conversion of the debt for 168,185 shares of the
Corporation's Series A preferred stock.
 
  The Corporation had a Stock Repurchase Program under which up to 6 million
shares could be repurchased annually. In connection with the acquisition of
Advantage Bancorp, Inc., the Company rescinded its stock repurchase program
effective March 16, 1998. The total shares purchased in 1998 were 0.6 million
shares. On January 12, 1999, the Corporation announced its intentions to
purchase up to 6 million shares annually. The shares will be acquired to have
treasury shares available for issuance pursuant to employee benefit plans and
for other corporate needs. Any such purchases may be conducted through open
market or privately negotiated transactions. The price, timing and actual
number of shares purchased will depend on market conditions.
 
                                   Year 2000
 
  Year 2000 is the term used to describe the fact that many existing computer
programs use only two digits to identify a year in a date field. These
programs were designed and developed without considering the impact of the
upcoming change in the century. If not corrected, many computer applications
could fail or create erroneous results by or at the year 2000. The term also
refers to devices with imbedded technology that are time sensitive and may
fail to recognize year 2000 correctly. This issue affects virtually all
companies and organizations.
 
  The Corporation recognizes the need to ensure its operations and income
stream will not be adversely impacted by year 2000 related events. The Board
of Directors receive periodic updates on plan revisions, progress achieved
compared to targets and the costs involved. Also, the Corporation Internal
Audit Group is evaluating the processes and procedures used to address the
problem and the progress being made. Proactive "information sharing" is
encouraged by the Corporation, both internally and externally, through an
employee newsletter, written communications and regional workshops with
customers, the Corporation's Web site, trade groups, vendors, utilities and
the government.
 
  The Corporation has made it a priority to resolve any potential business
issues connected with year 2000 and has made solid progress toward protecting
itself from the risks associated with it. However, despite the detailed
planning, execution and verification steps taken by the Corporation, there can
be no assurance that all issues have been identified or successfully resolved.
 
  The following is a summary of the risks, state of readiness, contingency
plans and estimated costs for addressing year 2000. For purposes of this
discussion, the summary has been segregated between Data Services and the
remainder of the Corporation and Subsidiaries. The Corporation's banking
affiliates are heavily reliant on Data Services with respect to their core
processing systems (loans and deposits).
 
                                      29
<PAGE>
 
                                 DATA SERVICES
 
  Data Services is in the business of developing, maintaining, and running
software serving the financial services industry. Banking institutions
comprise the majority of its customers. Future data processing revenue is
critically dependent upon successfully implementing the necessary changes to
ensure year 2000 compliance.
 
  Data Services began developing its plan to address Year 2000 in 1996. Data
Services employs approximately 150 full-time equivalent employees who are
dedicated to the Year 2000 project and maintains a dedicated code renovation
center and testing facility. Code modifications and testing have been
completed for licensed software and upgrades have been distributed to
customers. Service bureau code modifications were completed in December 1997.
In September and October of 1998 the service bureau core application systems
were converted and are now running on year 2000 compliant software. "19xx"
testing and system verification have been completed by a selected group of
customers. Additional "20xx" testing and verification are currently in process
with customer acceptance expected in March 1999. M&I's banking affiliates are
participants in both of these testing phases. Data Services will continue
testing to ensure other modifications and enhancements implemented prior to
Year 2000 are compliant. Because Data Services is in a technology business, it
is heavily reliant on software and hardware products. Data Services is in the
process of inventorying and validating year 2000 compliance for all third-
party software and computer hardware including mainframe, open systems,
network and desktop equipment.
 
  With the most critical phase of the year 2000 project almost complete, the
physical infrastructure including elevators, security systems, heating and air
conditioning is being assessed. The majority of testing, system modifications
and infrastructure changes will be completed in the second quarter of 1999.
 
  In August 1998 Data Services received ITAA*2000 certification from the
Information Technology Association of America. The program examines processes
and methods used by companies to perform their year 2000 software conversions.
In addition, Data Services progress and plans are subject to periodic review
and evaluation by banking regulatory agencies.
 
  In August 1998 Data Services adopted a "Year 2000 Contingency Strategy" plan
which is an expansion of their pre-existing "Services Continuity Recovery"
plan. This plan includes an analysis of "most reasonably likely year 2000
worst case scenarios" and their planned solutions to those scenarios. The plan
follows all the Federal Financial Institutions Examination Council's (FFIEC)
guidelines. Examples of these scenarios and planned solutions are, a power
interruption at a data processing facility mitigated by an onsite generator,
and simultaneous disasters at all data processing locations mitigated by the
use of a prearranged third party facility.
 
            CORPORATION AND SUBSIDIARIES (Excluding Data Services)
 
  The Corporation and its other affiliates began addressing Year 2000 in 1997.
The overall process is being coordinated through M&I Support Services which
has a dedicated function addressing the issue. Their mission includes
providing an overall plan, communicating and documenting the process and
reporting of progress including periodic reporting to the banking affiliates
primary regulator(s). In addition, a coordinator has been appointed from each
affiliate bank and division of the Corporation. In some cases external
resources or consultants are contracted for assistance with the project or for
specific business line solutions. Planning of the project was completed in
June 1997. The inventory of hardware, software, electronic equipment and
building systems was completed in January 1998. Designated "Mission Critical
Software" has been renovated and is in the validation phase which is projected
to be completed in the first quarter of 1999.
 
  The risk assessment phase of analyzing vendor readiness, and testing
hardware is substantially complete. The plan for renovation of systems is in
process. This phase includes developing an action plan for each inventory
item, developing hardware and "Non-Mission Critical" software upgrades and/or
replacement schedules and implementation. Major items in this group needing
upgrades or replacement include PCs, ATMs
 
                                      30
<PAGE>
 
and their related networks. The remaining phases include testing of
implementation, certification of hardware, software, office machines and
building systems. The Corporation anticipates this process to be completed in
the second quarter of 1999.
 
  The Corporation also has a risk that major loan customers may incur year
2000 problems that might inhibit their ability to repay their obligations or
affect the Corporation's ability to access collateral in the event of default.
All customers with loans exceeding a specified threshold amount have been sent
a year 2000 questionnaire designed to summarize their state of readiness.
Additional mailings or phone contact is being made with loan customers that
have not responded to initial requests for information. Those responding to
the mail surveys or contacted by phone have been assessed and assigned a risk
factor for year 2000 readiness. These assessments have become a part of the
Corporation's ongoing Credit Review process. Applicants for certain types and
sizes of new loans are required to submit similar information which will be
used in the underwriting and monitoring processes.
 
  Although M&I has had contingency plans (disaster recovery) in place covering
major business disruptions like power outages and communications or computer
system failures for some time, in January 1998, the Corporation began to
revise these plans to specifically include year 2000 issues. As a part of this
process the Corporation is identifying a list of "most reasonably likely worst
case scenarios" and action plans to minimize business disruption if they were
to occur. The major scenarios identified take into account the Corporation's
dependency on utilities, government and customer behavior over which it has
very limited control. Reviews have been made of the year 2000 programs and
contingency plans of the Federal Reserve and major utilities. Periodic updates
of their progress in following their year 2000 readiness timetables are being
made. Contingency plan revisions are expected to be completed in the second
quarter of 1999.
 
                            YEAR 2000 RELATED COSTS
 
  The majority of Data Services' contracts do not provide for additional
reimbursement over and above the previously contracted maintenance amounts.
The current estimate of the Corporation's total net direct cost for the year
2000 effort as outlined above is approximately $40 million with Data Services
representing approximately 88% of that amount. Approximately $25 million or
63% has been expensed through December 31, 1998. The cost for the years ended
December 31, 1998, 1997 and 1996 were $15 million, $7 million, and $3 million,
respectively. Prior periods amounts have been restated to conform with the
additional guidance issued by the Securities and Exchange Commission on
November 9, 1998, which, among other things, more clearly defines the types of
expenses that should be disclosed. Replacement equipment and software are
being capitalized or expensed in accordance with the Corporation's normal
accounting policies. The effect of writing off the net book value of equipment
or software that is not Year 2000 compliant is included in the above
estimates.
 
ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
 
  Market risk arises from exposure to changes in interest rates, exchange
rates, commodity prices, and other relevant market rate or price risk. The
Corporation faces market risk through trading and other than trading
activities. While market risk that arises from trading activities in the form
of foreign exchange and interest rate risk is immaterial to the Corporation,
market risk from other than trading activities in the form of interest rate
risk is measured and managed through a number of methods. The Corporation uses
financial modeling techniques which measure the sensitivity of future earnings
and the change in fair value due to changing rate environments to measure
interest rate risk. Policies established by the Corporate Asset/Liability
Committee and approved by the Corporate Board of Directors limit exposure for
both earnings and fair value at risk. General interest rate movements are used
to develop sensitivity as the Corporation feels it has no primary exposure to
a specific point on the yield curve. These limits are based on the
Corporation's exposure to a 100 basis point immediate and sustained parallel
rate move, either upward or downward. The Corporation manages interest rate
risk through the use of a limited array of derivative financial instruments.
These instruments allow the Corporation to produce
 
                                      31
<PAGE>
 
the desired balance sheet repricing structure while simultaneously meeting the
desired objectives of both its borrowing and depositing customers. For
additional information on the Corporation's derivative financial instruments
and foreign exchange position, see Note 17 to the Consolidated Financial
Statements contained in Item 8 herein.
 
 Interest Rate Risk
 
  In order to measure earnings and fair value sensitivity to changing rates,
the Corporation uses three different measurement tools including static gap
analysis, simulation of earnings, and market value sensitivity (fair value at
risk). The static gap analysis starts with contractual repricing information
for assets, liabilities and off-balance sheet instruments. These items are
then combined with repricing estimations for administered rate (NOW, Savings,
and Money Market accounts) and non rate related products (DDA accounts, Other
Assets and Other Liabilities) to create a baseline repricing balance sheet. In
addition to the contractual information, residential mortgage whole loan
product and mortgage-backed securities are adjusted based on industry
estimates of prepayment speeds that capture the expected prepayment of
principle above the contractual amount based on how far away the contractual
coupon is from market coupon rates. The resulting static gap is the base for
the earnings sensitivity calculation. The following table represents the
Corporation's consolidated static gap position as of December 31, 1998 ($ in
millions):
 
<TABLE>
<CAPTION>
                           1-90     91-180    181-270   271-360             1 Year
                           Days      Days      Days      Days     Subtotal     +     Total
                          -------   -------   -------   -------   --------  ------- -------
<S>                       <C>       <C>       <C>       <C>       <C>       <C>     <C>
Loans and Leases........  $ 5,530   $ 1,079   $   819   $   723   $ 8,151   $ 5,619 $13,770
Securities..............      317       374       378       325     1,394     3,712   5,106
Other Interest Bearing
 Assets.................      232       --        --        --        232       --      232
Other Assets............      --        --        --        --        --      2,458   2,458
                          -------   -------   -------   -------   -------   ------- -------
    Total Assets........  $ 6,079   $ 1,453   $ 1,197   $ 1,048   $ 9,777   $11,789 $21,566
                          =======   =======   =======   =======   =======   ======= =======
Rate Sensitive
 Liabilities............  $ 8,927   $ 1,132   $   969   $   638   $11,666   $ 4,316 $15,982
Non Rate Sensitive
 Liabilities & Equity...      --        --        --        --        --      5,584   5,584
                          -------   -------   -------   -------   -------   ------- -------
Total Liabilities &
 Equity.................  $ 8,927   $ 1,132   $   969   $   638   $11,666   $ 9,900 $21,566
                          =======   =======   =======   =======   =======   ======= =======
Gap.....................  $(2,848)  $   321   $   228   $   410             $ 1,889
Cumulative Gap..........   (2,848)   (2,527)   (2,299)   (1,889)
Cumulative Gap as a % of
 Total Assets...........   (13.21)%  (11.72)%  (10.66)%   (8.76)%
Total Off Balance Sheet.  $  (877)  $   150   $    66   $   106   $  (555)  $   555 $   --
Gap.....................  $(3,725)  $   471   $   294   $   516             $ 2,444
Cumulative Gap..........   (3,725)   (3,254)   (2,960)   (2,444)
Cumulative Gap as a % of
 Total Assets...........   (17.27)%  (15.09)%  (13.73)%  (11.33)%
</TABLE>
- --------
Notes:
(1) Off-balance sheet information does not include $50 million of interest
    rate caps and floors.
(2) The interest rate sensitivity assumptions for demand deposits, savings
    accounts, money market accounts, and NOW accounts are based on current and
    historical experiences regarding portfolio retention and interest rate
    repricing behavior. Based on these experiences, a portion of these
    balances is considered to be long-term and fairly stable and is therefore
    included in the "1 year +" category.
 
  The static gap analysis provides a representation of the Corporations
earnings sensitivity to changes in interest rates. Interest rate risk of
embedded positions including prepayment and early withdrawal options, lagged
interest rate changes, administered interest rate products, and cap and floor
options within products require a more dynamic measuring tool to capture
earnings and fair value risk. Earnings simulation and fair value sensitivity
analysis are used to create a more complete assessment of interest rate risk.
 
                                      32
<PAGE>
 
  Along with the static gap analysis, determining the sensitivity of future
earnings to a hypothetical +/- 100 basis point parallel rate shock can be
accomplished through the use of simulation modeling. In addition to the
assumptions used to create the static gap, simulation of earnings includes the
modeling of the balance sheet as an ongoing entity. Future business
assumptions involving administered rate products, prepayments for future rate
sensitive balances, and the reinvestment of maturing assets and liabilities
are included. These items are then modeled to project income based on a
hypothetical change in interest rates. The resulting pretax income for the
next 12 month period is compared to the pretax income amount calculated using
flat rates. This difference represents the Corporation's earnings sensitivity
to a +/- 100 basis point parallel rate shock. The following table illustrates
these amounts as of December 31, 1998, which are within the limits established
by the Corporation:
 
<TABLE>
<CAPTION>
      Hypothetical Change                                       Impact to 1998
      in Interest Rates                                        Pretax Net Income
      -------------------                                      -----------------
      <S>                                                      <C>
      100 basis point Shock Up................................       (8.6%)
      100 basis point Shock Down..............................        5.9%
</TABLE>
 
  These results are based solely on immediate and sustained parallel changes
in market rates and do not reflect the earnings sensitivity that may arise
from other factors such as changes in the shape of the yield curve, the change
in spread between key market rates, or accounting recognition for impairment
of certain intangibles. The above results are also considered to be
conservative estimates due to the fact that no management action to mitigate
potential income variances are included within the simulation process. This
action would include, but would not be limited to, adjustments to the
repricing characteristics of any on or off balance sheet item with regard to
short-term rate projections and current market value assessments.
 
  Another component of interest rate risk, fair value at risk, is determined
by the Corporation through the technique of simulating the fair value of
equity in changing rate environments. This technique involves determining the
present value of all contractual asset and liability cash flows (adjusted for
prepayments) based on a predetermined discount rate. The net result of all
these balance sheet items determine the fair value of equity. The fair value
of equity resulting from the current flat rate scenario is compared to the
fair value of equity calculated using discount rates +/- 100 basis points from
flat rates to determine the fair value of equity at risk. Currently, fair
value of equity at risk is less than 2.5% of the market value of the
Corporation as of December 31, 1998.
 
  In September 1998 the Corporation began acting as an intermediary for swap
agreements on behalf of its customers. These are derivative financial
instruments and are matched off by the Corporation to eliminate exposure to
market risk. These interest rate swaps held for trading included $35 million
in notional amount of receive fixed and $35 million in notional amount of pay
fixed at December 31, 1998.
 
 Equity Risk
 
  In addition to interest rate risk, the Corporation incurs market risk in the
form of equity risk. M&I's Capital Markets Group invests in private, medium-
sized companies to help establish new businesses or recapitalize existing
ones. Exposure to the change in equity values for the companies that are held
in their portfolio exists, but due to the nature of the investments, cannot be
quantified within acceptable levels of precision.
 
  M&I Trust Services administers more than $47 billion in assets and directly
manages a portfolio of more than $9 billion. Exposure exists to changes in
equity values due to the fact that fee income is partially based on equity
balances. While this exposure is present, quantification remains difficult due
to the number of other variables affecting fee income. Interest rate changes
can also have an effect on fee income for the above stated reasons.
 
  In addition to the above market risks, material limitations exist in
determining the overall net market risk exposure of the Corporation.
Computation of prospective effects of hypothetical interest rate changes are
based on many assumptions, including levels of market interest rates,
predicted prepayment speeds, and projected decay rates of core deposits. Other
items, such as post retirement benefit obligations can also have fair value at
risk exposure due to changes in interest rates. Therefore, the above outcomes
should not be relied upon as indicative of actual results.
 
                                      33
<PAGE>
 
ITEM 8. CONSOLIDATED FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA FOR YEARS
       ENDED DECEMBER 31, 1998, 1997, AND 1996
 
                          Consolidated Balance Sheets
                     December 31 ($000's except share data)
 
<TABLE>
<CAPTION>
                                                            1998        1997
                                                         ----------- -----------
<S>                                                      <C>         <C>
Assets
Cash and Cash Equivalents:
  Cash and Due from Banks..............................  $   760,405 $   817,491
  Funds Sold and Security Resale Agreements............       34,616      34,586
  Money Market Funds...................................      111,717      65,986
                                                         ----------- -----------
Total Cash and Cash Equivalents........................      906,738     918,063
Investment Securities:
  Trading Securities, at Market Value..................       34,046      43,644
  Other Short-term Investments, at Cost which
   Approximates Market Value...........................       51,971      37,018
  Other Available for Sale, at Market Value............    4,049,421   4,208,616
  Held to Maturity, Market Value $1,095,048 ($1,203,872
   in 1997)............................................    1,056,233   1,176,688
                                                         ----------- -----------
Total Investment Securities............................    5,191,671   5,465,966
Loans and Leases, Net of Unearned Income of $128,680
 ($98,979 in 1997).....................................   13,996,166  13,101,912
Less: Allowance for Loan and Lease Losses..............      226,052     208,651
                                                         ----------- -----------
Net Loans and Leases...................................   13,770,114  12,893,261
Premises and Equipment.................................      360,345     351,423
Goodwill and Core Deposit Intangibles..................      317,414     329,592
Other Intangibles......................................       18,119      27,374
Accrued Interest and Other Assets......................    1,001,892     516,479
                                                         ----------- -----------
    Total Assets.......................................  $21,566,293 $20,502,158
                                                         =========== ===========
Liabilities and Shareholders' Equity
Deposits:
  Noninterest Bearing..................................  $ 2,929,195 $ 2,753,320
  Interest Bearing.....................................   12,990,724  12,267,008
                                                         ----------- -----------
    Total Deposits.....................................   15,919,919  15,020,328
Short-term Borrowings..................................    2,077,285   2,047,086
Accrued Expenses and Other Liabilities.................      530,828     516,779
Long-term Borrowings...................................      794,482     895,536
                                                         ----------- -----------
    Total Liabilities..................................   19,322,514  18,479,729
Shareholders' Equity:
  Series A Convertible Preferred Stock, $1.00 par
   value, 2,000,000 Shares Authorized; 685,314 Shares
   Issued; Liquidation Preference $68,531..............          685         685
  Common Stock, $1.00 par value, 160,000,000 Shares
   Authorized; 112,757,546 Shares Issued (113,185,374
   in 1997)............................................      112,757     113,185
  Additional Paid-in Capital...........................      621,795     620,899
  Retained Earnings....................................    1,664,123   1,460,646
  Less: Treasury Stock, at Cost, 6,654,170 Shares
   (7,765,169 in 1997).................................      194,046     215,787
    Deferred Compensation..............................       19,637       9,297
    Net Unrealized Securities Gains
    Net of Taxes.......................................       58,102      52,098
                                                         ----------- -----------
    Total Shareholders' Equity.........................    2,243,779   2,022,429
                                                         ----------- -----------
    Total Liabilities and Shareholders' Equity.........  $21,566,293 $20,502,158
                                                         =========== ===========
</TABLE>
 
   The accompanying notes are an integral part of the Consolidated Financial
                                  Statements.
 
                                       34
<PAGE>
 
                       Consolidated Statements of Income
               Years ended December 31 ($000's except share data)
 
<TABLE>
<CAPTION>
                                                  1998       1997       1996
                                               ---------- ---------- ----------
<S>                                            <C>        <C>        <C>
Interest Income
Loans and Leases.............................. $1,085,829 $  921,161 $  804,951
Investment Securities:
  Taxable.....................................    280,377    240,238    198,787
  Exempt from Federal Income Taxes............     52,969     45,420     30,718
Trading Securities............................      2,203      2,016      1,202
Other Short-term Investments..................     12,666     11,498     10,163
                                               ---------- ---------- ----------
    Total Interest Income.....................  1,434,044  1,220,333  1,045,821
Interest Expense
Deposits......................................    564,540    460,418    392,473
Short-term Borrowings.........................    126,624    111,193     63,892
Long-term Borrowings..........................     66,810     54,175     53,615
                                               ---------- ---------- ----------
    Total Interest Expense....................    757,974    625,786    509,980
                                               ---------- ---------- ----------
Net Interest Income...........................    676,070    594,547    535,841
Provision for Loan and Lease Losses...........     27,090     17,633     15,634
                                               ---------- ---------- ----------
Net Interest Income After Provision for Loan
 and Lease Losses.............................    648,980    576,914    520,207
Other Income
Data Processing Services......................    412,632    343,846    268,526
Trust Services................................     88,496     78,595     70,190
Other Customer Services.......................    152,762    133,658    122,594
Net Securities Gains..........................     30,783      4,127     15,471
Other.........................................     71,660     48,243     34,493
                                               ---------- ---------- ----------
    Total Other Income........................    756,333    608,469    511,274
Other Expense
Salaries and Employee Benefits................    523,606    460,164    392,711
Net Occupancy.................................     44,181     41,252     40,759
Equipment.....................................    103,180     88,358     78,803
Software Expenses.............................     22,181     19,702     15,222
Payments to Regulatory Agencies...............      4,834      3,518     10,741
Processing Charges............................     25,286     25,295     19,752
Supplies and Printing.........................     18,679     16,990     16,015
Professional Services.........................     25,326     17,348     17,979
Amortization of Intangibles...................     42,457     20,388     17,867
Merger/Restructuring..........................     23,373        --         --
Other.........................................    106,925    104,196    103,683
                                               ---------- ---------- ----------
    Total Other Expense.......................    940,028    797,211    713,532
                                               ---------- ---------- ----------
Income Before Income Taxes....................    465,285    388,172    317,949
Provision for Income Taxes....................    163,962    131,487    111,314
                                               ---------- ---------- ----------
Net Income.................................... $  301,323 $  256,685 $  206,635
                                               ========== ========== ==========
Net Income Per Common Share
Basic......................................... $     2.79 $     2.62 $     2.12
Diluted.......................................       2.61       2.43       1.98
</TABLE>
 
   The accompanying notes are an integral part of the Consolidated Financial
                                  Statements.
 
                                       35
<PAGE>
 
                     Consolidated Statements of Cash Flows
                        Years ended December 31 ($000's)
 
<TABLE>
<CAPTION>
                                            1998         1997         1996
                                         -----------  -----------  -----------
<S>                                      <C>          <C>          <C>
Cash Flows From Operating Activities
Net Income.............................  $   301,323  $   256,685  $   206,635
Adjustments to Reconcile Net Income to
 Net Cash Provided by Operating
 Activities:
  Depreciation and Amortization........      111,392       63,935       56,094
  Provision for Loan and Lease Losses..       27,090       17,633       15,634
  Gains on Sales of Assets.............      (77,183)     (33,585)     (31,854)
  Proceeds from Sales of Trading
   Securities and Loans Held for
   Resale..............................    5,211,992    4,220,597    4,078,854
  Purchases of Trading Securities and
   Loans Held for Resale...............   (5,245,240)  (4,237,853)  (4,102,499)
  Other................................      (59,464)     (12,638)      17,326
                                         -----------  -----------  -----------
    Total Adjustments..................      (31,413)      18,089       33,555
                                         -----------  -----------  -----------
Net Cash Provided by Operating
 Activities............................      269,910      274,774      240,190
Cash Flows From Investing Activities
Net (Increase) Decrease in Shorter Term
 Securities............................      (14,450)       6,050       52,447
Proceeds from Maturities of Longer Term
 Securities............................    1,461,553      789,324      912,229
Proceeds from Sales of Securities
 Available for Sale....................      160,474      797,270      797,890
Purchases of Longer Term Securities....   (1,054,290)  (1,373,780)  (2,379,186)
Decrease in Loans Due to Divestitures..          --         4,546       13,729
Net Increase in Loans..................   (1,016,336)    (978,960)    (683,065)
Purchases of Assets to be Leased.......     (317,862)    (295,185)    (171,395)
Principal Payments on Lease
 Receivables...........................      242,227      197,372      145,095
Purchases of Premises and Equipment,
 Net...................................      (60,811)     (68,829)     (53,383)
Acquisitions Accounted for as
 Purchases, Net of Cash Equivalents
 Acquired                                     (5,170)    (236,399)         --
Purchase of Bank-Owned Life Insurance..     (400,000)         --           --
Other..................................       14,997       11,741      (18,945)
                                         -----------  -----------  -----------
Net Cash Used in Investing Activities..     (989,668)  (1,146,850)  (1,384,584)
Cash Flows From Financing Activities
Decrease in Deposits Due to
 Divestitures..........................          --       (56,294)     (25,874)
Net Increase in Deposits...............      899,591    1,064,439      703,019
Proceeds from Issuance of Commercial
 Paper.................................      779,653      455,726      641,754
Principal Payments on Commercial Paper.     (829,077)    (360,374)    (669,091)
Net Increase (Decrease) in Other Short-
 term Borrowings.......................       41,210      (46,517)   1,022,799
Proceeds from Issuance of Long-term
 Debt..................................       87,573      182,371      317,835
Payment of Long-term Debt..............     (159,963)    (346,064)    (519,589)
Dividends Paid.........................      (97,241)     (79,272)     (70,966)
Purchase of Common Stock...............      (29,633)     (64,430)    (180,053)
Proceeds from the Issuance of Common
 Stock.................................       15,086       23,538       13,305
Other..................................        1,234          --             7
                                         -----------  -----------  -----------
Net Cash Provided by Financing
 Activities............................      708,433      773,123    1,233,146
                                         -----------  -----------  -----------
Net Increase (Decrease) in Cash and
 Cash Equivalents......................      (11,325)     (98,953)      88,752
Cash and Cash Equivalents, Beginning of
 Year..................................      918,063    1,017,016      928,264
                                         -----------  -----------  -----------
Cash and Cash Equivalents, End of Year.  $   906,738  $   918,063  $ 1,017,016
                                         ===========  ===========  ===========
Supplemental Cash Flow Information:
Cash Paid During the Year for:
  Interest.............................  $   759,231  $   607,614  $   506,184
  Income Taxes.........................      141,553      103,716      103,847
</TABLE>
 
   The accompanying notes are an integral part of the Consolidated Financial
                                  Statements.
 
                                       36
<PAGE>
 
                Consolidated Statements of Shareholders' Equity
                           ($000's except share data)
 
<TABLE>
<CAPTION>
                                                                                                Unrealized
                         Compre-                      Additional             Treasury  Deferred Securities
                         hensive  Preferred  Common    Paid-in    Retained    Common   Compen-  Gains Net
                          Income    Stock    Stock     Capital    Earnings    Stock     sation   of Taxes
                         -------- --------- --------  ---------- ----------  --------  -------- ----------
<S>                      <C>      <C>       <C>       <C>        <C>         <C>       <C>      <C>
Balance, December 31,
 1995, As Previously
 Reported..............       --    $349    $ 99,494   $190,287  $1,075,789  $128,459   $1,090   $21,247
Adjustment to
 Retroactively Restate
 for 1998 Business
 Combination Accounted
 for as a Pooling of
 Interests.............       --     --        4,157     20,976      72,304       --     2,797     2,196
                                    ----    --------   --------  ----------  --------   ------   -------
Balance, December 31,
 1995, Restated........       --     349     103,651    211,263   1,148,093   128,459    3,887    23,443
Comprehensive Income:
 Net Income............  $206,635    --          --         --      206,635       --       --        --
 Unrealized Gains on
  Securities:
   Unrealized
    Securities Gains
    Net of Taxes of
    $1,651.............     3,085    --          --         --          --        --       --        --
   Reclassification
    Adjustment for
    Losses Included in
    Net Income Net of
    Income Tax Benefit
    of $970............     1,822    --          --         --          --        --       --        --
                         --------
     Total Unrealized
      Gains on
      Securities.......     4,907    --          --         --          --        --       --      4,907
                         --------
Comprehensive Income...  $211,542    --          --         --          --        --       --        --
                         ========
Transactions by
 Affiliates Prior to
 Combination...........       --     --          --         --       (1,088)      --       --        --
Issuance of 1,922,114
 Treasury Common Shares
 on Conversion of
 Convertible Notes.....       --     --          --     (25,660)        --    (42,517)     --        --
Issuance of 168,185
 Preferred Shares on
 Conversion of
 1,922,114 Common
 Shares................       --     168         --      42,349         --     42,517      --        --
Issuance of 1,049,700
 Common and Treasury
 Common Shares Under
 Stock Option and
 Restricted Stock
 Plans.................       --     --           67     (8,637)       (315)  (22,422)     141       --
Acquisition of
 6,218,671 Common
 Shares................       --     --         (294)    (7,659)        --    173,106      --        --
Dividends Declared on
 Preferred Stock--$7.99
 Per Share.............       --     --          --         --       (3,827)      --       --        --
Dividends Declared on
 Common Stock--$0.72
 Per Share.............       --     --          --         --      (66,051)      --       --        --
Repayment of ESOP Loan.       --     --          --         --          --        --      (281)      --
Net Change in Deferred
 Compensation..........       --     --          --         140         --        --      (373)      --
Income Tax Benefit for
 Compensation Expense
 for Tax Purposes in
 Excess of Amounts
 Recognized for
 Financial Reporting
 Purposes..............       --     --          --       6,527         --        --       --        --
Other..................       --     --          --         --         (174)      --       --        --
                                    ----    --------   --------  ----------  --------   ------   -------
Balance, December 31,
 1996..................             $517    $103,424   $218,323  $1,283,273  $279,143   $3,374   $28,350
                                    ====    ========   ========  ==========  ========   ======   =======
</TABLE>
 
   The accompanying notes are an integral part of the Consolidated Financial
                                  Statements.
 
                                       37
<PAGE>
 
                Consolidated Statements of Shareholders' Equity
                           ($000's except share data)
 
<TABLE>
<CAPTION>
                                                                                                 Unrealized
                         Compre-                       Additional             Treasury  Deferred Securities
                         hensive   Preferred  Common    Paid-in    Retained    Common   Compen-  Gains Net
                          Income     Stock    Stock     Capital    Earnings    Stock     sation   of Taxes
                         --------  --------- --------  ---------- ----------  --------  -------- ----------
<S>                      <C>       <C>       <C>       <C>        <C>         <C>       <C>      <C>
Balance, December 31,
 1996..................       --     $517    $103,424   $218,323  $1,283,273  $279,143   $3,374   $28,350
Comprehensive Income:
 Net Income............  $256,685     --          --         --      256,685       --       --        --
 Unrealized Gains on
  Securities:
   Unrealized
    Securities Gains
    Net of Taxes of
    $14,254............    24,945     --          --         --          --        --       --        --
   Reclassification
    Adjustment for
    Gains Included in
    Net Income Net of
    Taxes of $600......    (1,197)    --          --         --          --        --       --        --
                         --------
     Total Unrealized
      Gains on
      Securities.......    23,748     --          --         --          --        --       --     23,748
                         --------
Comprehensive Income...  $280,433     --          --         --          --        --       --        --
                         ========
Transactions by
 Affiliates Prior to
 Combination...........       --      --          --         --       (1,297)      --       --        --
Issuance of 9,808,255
 Common Shares and
 2,515,955 Treasury
 Common Shares in the
 Acquisition of
 Security Capital
 Corporation
 ("Security")..........       --      --        9,809    406,726         --    (66,806)     --        --
Common Shares Held for
 Deferred Compensation
 and Retirement Plans
 Assumed in the
 Acquisition of
 Security--148,997
 Common Shares.........       --      --          --         --          --        --     5,559       --
Issuance of 1,922,114
 Treasury Common Shares
 on Conversion of
 Convertible Notes.....       --      --          --     (33,868)        --    (50,725)     --        --
Issuance of 168,185
 Preferred Shares on
 Conversion of
 1,922,114 Common
 Shares................       --      168         --      50,557         --     50,725      --        --
Issuance of 1,880,929
 Common and Treasury
 Common Shares Under
 Stock Option and
 Restricted Stock
 Plans.................       --      --           18    (24,623)        (40)  (48,800)     155       --
Acquisition of
 1,298,633 Common
 Shares................       --      --          (66)   (12,075)        --     52,250      --        --
Dividends Declared on
 Preferred Stock--$8.78
 Per Share.............       --      --          --         --       (5,671)      --       --        --
Dividends Declared on
 Common Stock--$0.785
 Per Share.............       --      --          --         --      (72,304)      --       --        --
Repayment of ESOP Loan.       --      --          --         --          --        --      (332)      --
Net Change in Deferred
 Compensation..........       --      --          --         155         --        --       541       --
Income Tax Benefit for
 Compensation Expense
 for Tax Purposes in
 Excess of Amounts
 Recognized for
 Financial Reporting
 Purposes..............       --      --          --      15,704         --        --       --        --
                                     ----    --------   --------  ----------  --------   ------   -------
Balance, December 31,
 1997..................              $685    $113,185   $620,899  $1,460,646  $215,787   $9,297   $52,098
                                     ====    ========   ========  ==========  ========   ======   =======
</TABLE>
 
   The accompanying notes are an integral part of the Consolidated Financial
                                  Statements.
 
                                       38
<PAGE>
 
                Consolidated Statements of Shareholders' Equity
                           ($000's except share data)
 
<TABLE>
<CAPTION>
                                                                                                  Unrealized
                                                                                                  Securities
                         Compre-                       Additional             Treasury  Deferred    Gains
                         hensive   Preferred  Common    Paid-in    Retained    Common   Compen-     Net of
                          Income     Stock    Stock     Capital    Earnings    Stock     sation     Taxes
                         --------  --------- --------  ---------- ----------  --------  --------  ----------
<S>                      <C>       <C>       <C>       <C>        <C>         <C>       <C>       <C>
Balance, December 31,
 1997..................       --     $ 685   $113,185   $620,899  $1,460,646  $215,787  $ 9,297    $52,098
Comprehensive Income:
 Net Income............  $301,323      --         --         --      301,323       --       --         --
 Unrealized Gains on
  Securities:
   Unrealized
    Securities Gains
    Net of Taxes of
    $6,367.............    11,262      --         --         --          --        --       --         --
   Reclassification
    Adjustment for
    Gains Included in
    Net Income Net of
    Taxes of $2,940....    (5,258)     --         --         --          --        --       --         --
                         --------
     Total Unrealized
      Gains on
      Securities.......     6,004      --         --         --          --        --       --       6,004
                         --------
Comprehensive Income...  $307,327      --         --         --          --        --       --         --
                         ========
Transactions by
 Affiliates Prior to
 Combination...........       --       --         --         --         (327)      --       --         --
Issuance of 526,200
 Treasury Common Shares
 in the 1998 Business
 Combination...........       --       --        (526)   (14,255)        --    (14,781)     --         --
Issuance of 1,133,564
 Common and Treasury
 Common Shares Under
 Stock Option and
 Restricted Stock
 Plans.................       --       --         139    (10,830)       (592)  (28,151)   1,728        --
Acquisition of 697,247
 Common Shares.........       --       --         (41)       821         --     33,770     (486)       --
Dividends Declared on
 Preferred Stock--$9.63
 Per Share.............       --       --         --         --       (6,603)      --       --         --
Dividends Declared on
 Common Stock--$0.86
 Per Share.............       --       --         --         --      (90,311)      --       --         --
Repayment of ESOP Loan.       --       --         --       1,246         --        --    (1,373)       --
Merger/Restructuring
 Charge................       --       --         --       9,893         --        --       --         --
Transfer of 246,854
 Treasury Common Shares
 to Directors' Deferred
 Compensation Trust....       --       --         --         --          --    (12,608)  12,608        --
Net Change in Deferred
 Compensation..........       --       --         --         175         (10)       29   (2,136)       --
Income Tax Benefit for
 Compensation Expense
 for Tax Purposes in
 Excess of Amounts
 Recognized for
 Financial Reporting
 Purposes..............       --       --         --      13,846         --        --       --         --
Other..................       --       --         --         --           (3)      --        (1)       --
                                     -----   --------   --------  ----------  --------  -------    -------
Balance, December 31,
 1998..................              $ 685   $112,757   $621,795  $1,664,123  $194,046  $19,637    $58,102
                                     =====   ========   ========  ==========  ========  =======    =======
</TABLE>
 
   The accompanying notes are an integral part of the Consolidated Financial
                                  Statements.
 
                                       39
<PAGE>
 
                  Notes to Consolidated Financial Statements
 
         December 31, 1998, 1997, and 1996 ($000's except share data)
 
  Marshall & Ilsley Corporation ("M&I" or the "Corporation") is a bank and
savings and loan holding company that provides financial services to a wide
variety of corporate, institutional, government and individual customers. The
Corporation's principal activities consist of banking and data processing
services. Banking services, lending and accepting deposits from retail and
commercial customers, are provided through 26 banks located in Wisconsin, one
federally chartered thrift located in Illinois and one bank in Arizona.
Financial and data processing services and software sales are provided through
the Data Services Division of the Corporation and three other nonbank
subsidiaries. Other financial services provided by M&I include personal
property lease financing; investment management and advisory services;
commercial and residential mortgage banking; venture capital and financial
advisory services; trust services to residents of Wisconsin, Arizona and
Florida; and brokerage and insurance services. M&I's largest affiliates and
principal operations are in Wisconsin however, it has activities in other
markets, particularly in certain neighboring Midwestern states, and in Arizona
and Florida.
 
1. Summary of Significant Accounting Policies
 
  Estimates--The preparation of financial statements in conformity with
generally accepted accounting principles requires management to make estimates
and assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reported periods. Actual results could differ from those estimates.
 
  Consolidation principles--The Consolidated Financial Statements include the
accounts of Marshall & Ilsley Corporation and all subsidiaries. All
significant intercompany balances and transactions are eliminated in
consolidation. Certain amounts in the 1997 and 1996 Consolidated Financial
Statements have been reclassified to conform with the 1998 presentation.
 
  Cash and cash equivalents--For purposes of the Consolidated Financial
Statements, the Corporation defines cash equivalents as short-term investments
which have an original maturity of three months or less and are readily
convertible into cash.
 
  Securities--Securities, when purchased, are designated as Trading,
Investment Securities Held to Maturity, or Investment Securities Available for
Sale and remain in that category until they are sold or mature. The specific
identification method is used in determining the cost of securities sold.
 
  Investment Securities Held to Maturity are carried at cost, adjusted for
amortization of premiums and accretion of discounts. Investment Securities
Available for Sale are carried at fair value with fair value adjustments net
of the related income tax effects reported as a separate component of
shareholders' equity. Short-term Investments, other than Trading Securities,
are carried at cost, which approximates market value. Trading Securities are
carried at fair value, with adjustments to the carrying value reflected in the
Consolidated Statements of Income.
 
  Loans and leases--Interest on loans, other than direct financing leases, is
recognized as income based on the loan principal outstanding during the
period. Unearned income on financing leases is recognized over the lease term
on a basis that results in an approximate level rate of return on the lease
investment. Loans are generally placed on nonaccrual status when they are past
due 90 days as to either interest or principal. When a loan is placed on
nonaccrual status, previously accrued and uncollected interest is charged to
interest income on loans. A nonaccrual loan may be restored to an accrual
basis when interest and principal payments are brought current and
collectibility of future payments is not in doubt.
 
  The Corporation defers and amortizes fees and certain incremental direct
costs, primarily salary and employee benefit expenses, over the contractual
term of the loan or lease as an adjustment to the yield. The unamortized net
fees and costs are reported as part of the loan balance outstanding.
 
                                      40
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
  Allowance for loan and lease losses--The allowance for loan and lease losses
is maintained at a level believed adequate by management to absorb estimated
probable losses in the loan and lease portfolio. Management's determination of
the adequacy of the allowance is based on a continual review of the loan and
lease portfolio, loan and lease loss experience, economic conditions, growth
and composition of the portfolio, and other relevant factors. As a result of
management's continual review, the allowance is adjusted through provisions
for loan and lease losses charged against income.
 
  Premises and equipment--Land is recorded at cost. Premises and equipment are
recorded at cost and depreciated principally on the straight-line method with
annual rates varying from 2% to 10% for buildings and 10% to 35% for
equipment. Long-lived assets which are considered impaired are carried at fair
value and long-lived assets to be disposed of are carried at the lower of the
carrying amount or fair value less cost to sell. Maintenance and repairs are
charged to expense and betterments are capitalized.
 
  Other real estate owned--Other real estate owned includes assets that have
been acquired in satisfaction of debts and bank branch premises held for sale.
Other real estate acquired in satisfaction of debts is recorded at fair value,
less estimated selling costs, and bank branch premises are recorded at the
lower of cost or fair value, less estimated selling costs, at the date of
transfer. Valuation adjustments required at the date of transfer for assets
acquired in satisfaction of debts are charged to the allowance for loan and
lease losses, whereas any valuation adjustments on premises are reported in
other expense. Subsequent to transfer, other real estate owned is carried at
the lower of cost or fair value, less estimated selling costs, based upon
periodic evaluations. Rental income from properties and gains on sales are
included in other income, and property expenses, which include carrying costs,
required valuation adjustments and losses on sales, are recorded in other
expense. At December 31, 1998 and 1997, other real estate amounted to $8,751
and $15,573, respectively.
 
  Mortgage servicing--Fees related to the servicing of mortgage loans are
recorded as income when payments are received from mortgagors. Mortgage loans
held for sale to investors are carried at the lower of cost or market,
determined on an aggregate basis, based on outstanding firm commitments
received for such loans or on current market prices. Mortgage loans held for
sale amounted to $137,295 at December 31, 1998 and $74,948 at December 31,
1997.
 
  Data processing services--Data processing and related revenues are accrued
and recognized when earned.
 
  Revenues attributable to the licensing of software are generally recognized
upon delivery and performance of certain contractual obligations, provided
that no significant vendor obligations remain and collection of the resulting
receivable is deemed probable. Service revenues from customer maintenance fees
for ongoing customer support and product updates are recognized ratably over
the term of the maintenance period. Service revenues from training and
consulting are recognized when the services are performed. Conversion revenue
is recognized ratably over the contract period, which may exceed one year.
 
  Direct costs associated with the production of computer software which will
be marketed or used in data processing operations are capitalized and
amortized on the straight-line method over the estimated economic life of the
product, generally four years. Such capitalized costs are periodically
evaluated for impairment and adjusted to net realizable value when impairment
is indicated. Direct costs associated with customer system conversions to the
data services operations are capitalized and amortized on the straight-line
method over the terms, generally five to seven years, of the related servicing
contract. Routine maintenance of software products including maintenance
required for the year 2000, design costs and development costs incurred prior
to establishment of a product's technological feasibility for software to be
sold, are expensed as incurred.
 
                                      41
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
  Net unamortized costs at December 31 were:
 
<TABLE>
<CAPTION>
                                                                  1998    1997
                                                                 ------- -------
      <S>                                                        <C>     <C>
      Software.................................................  $55,655 $43,426
      Conversions..............................................   12,359  14,729
                                                                 ------- -------
      Total....................................................  $68,014 $58,155
                                                                 ======= =======
</TABLE>
 
  Amortization expense was $18,340, $15,020, and $9,851, for 1998, 1997, and
1996, respectively.
 
  Intangibles--Unamortized intangibles resulting from acquisitions consists of
goodwill, core deposit premiums, purchased data processing contract rights and
mortgage servicing rights . The Corporation recognizes as separate assets
rights to service mortgage loans when the loans are purchased or originated
and sold with servicing retained. Mortgage servicing rights are amortized over
the periods during which the corresponding mortgage servicing revenues are
anticipated to be generated. Purchased data processing contract rights
represent the costs to acquire the rights to data processing and software
distribution. Such costs are generally amortized over the average contract
lives, which range from 5 to 8 years. Goodwill is amortized on the straight-
line basis over periods ranging from 15 to 25 years while core deposit
premiums are amortized principally on an accelerated basis over periods
ranging up to 10 years. The Corporation continually evaluates whether later
events and circumstances have occurred to indicate that the carrying value of
intangibles should be reduced for possible impairment and utilizes estimates
of undiscounted net income over the remaining life to measure recoverability.
A valuation allowance is established through a charge to income to the extent
that the fair value of any stratum of its mortgage servicing rights is less
than its carrying value.
 
  The Corporation also has negative goodwill included in other liabilities,
the majority of which arose from an acquisition in 1992. Negative goodwill
amounted to $5,932 and $7,494 at December 31, 1998 and 1997, respectively. The
negative goodwill is being accreted on a straight-line basis over a period of
10 years and amounted to $1,562, $1,562, and $1,568 in 1998, 1997, and 1996.
 
  Long-term borrowings--The guaranteed preferred beneficial interest of the
Corporation's special purpose finance subsidiary which holds as its sole
asset, junior subordinated deferrable interest debentures issued by the
Corporation, is classified as long-term borrowings and shown net of its
related discount. The distributions, including the related accretion of
discount, are classified as interest expense for purposes of the Consolidated
Financial Statements.
 
  Interest risk management instruments--As a service to customers and as part
of its asset/liability management activities, the Corporation may enter into
interest rate futures, forwards, swaps, floors, caps and option contracts.
These derivative financial instruments are carried at fair value unless the
instrument qualifies for hedge accounting treatment. Fair value adjustments on
risk management instruments carried at fair value are reflected in other
income. Gains and losses realized on futures and forward contracts qualifying
as hedges are deferred and amortized over the terms of the related assets or
liabilities and are included as adjustments to interest income or expense.
Settlement on interest rate swaps and option contracts are recognized over the
lives of the agreements as adjustments to interest income or expense.
 
  The hedge accounting method is applied to interest rate swaps that meet the
hedge criteria which is discussed below. Under this method, accrued income or
expense associated with the swap is recognized as a component of the interest
income or expense of the hedged asset or liability. Unrealized gains and
losses are recognized on a basis that is consistent with the method of
accounting for the hedged asset or liability. Unrealized gains or losses are
not recognized for hedged assets or liabilities carried at amortized cost.
Unrealized gains and losses on derivative financial instruments which hedge
investment securities available for sale are reported as a component of
shareholders' equity, net of applicable income tax effects.
 
                                      42
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
  The criteria to qualify an interest rate swap for the hedge accounting
method is as follows:
 
  1. The swap must be designated as a hedge and reduce the interest rate risk
     of the designated asset or liability.
 
  2. The notional amount of the swap must be less than or equal to the
     amortized cost of the asset or liability to be hedged.
 
  3. The swap must achieve its intended objective of converting the yield on
     the hedged asset or liability to the desired rate. This criteria is
     assumed to have been met if the interest rate on the hedged asset or
     liability is identical to the offsetting rate on the swap. If the two
     rates are not identical, the correlation between the levels of the two
     rates since inception of the swap must be measured to ensure that the
     swap is meeting its intended objective.
 
  If an interest risk management instrument is terminated or ceases to qualify
for the hedge accounting method, any realized or unrealized gain or loss at
that time is deferred and amortized over the remaining period of the original
hedge. Any subsequent realized or unrealized gains or losses on instruments
that no longer meet the hedge criteria are included in the determination of
net income. If the item being hedged is sold, any deferred or unrealized gain
or loss on the interest risk management instrument at the time of sale is
considered in the determination of the gain or loss on the sale. If the
interest risk management instrument is not terminated, it must be carried at
fair value on a prospective basis, with changes in fair value included in the
determination of periodic net income.
 
  Cash flows from interest risk management instruments are reported in the
Consolidated Statements of Cash Flows as operating activities.
 
  Foreign exchange contracts--Foreign exchange contracts include such
commitments as foreign currency spot, forward, future and option contracts.
Foreign exchange contracts and the premiums on options written or sold are
carried at market value, with realized and unrealized gains and losses
included in other income.
 
  Earnings per share--In February 1997, the Financial Accounting Standards
Board (FASB) issued Statement of Financial Accounting Standards ("SFAS") No.
128, "Earnings Per Share." This statement established new standards for
computing and presenting earnings per share which was adopted by the
Corporation in the fourth quarter of 1997. Comparative earnings per share for
prior years and all interim periods presented conform with the computational
requirements of SFAS 128.
 
  New accounting pronouncement--
 
  In June 1998, the Financial Accounting Standards Board issued Statement of
  Financial Standards No. 133, Accounting for Derivative Instruments and
  Hedging Activities. The Statement establishes accounting and reporting
  standards requiring that every derivative instrument (including certain
  derivative instruments embedded in contracts) be recorded in the balance
  sheet as either an asset or liability measured at its fair value. The
  Statement requires that changes in the derivatives fair value be recognized
  currently in earnings unless specific hedge accounting criteria are met.
  Special accounting for qualifying hedges typically allows a derivative's
  gains and losses to offset related results on the hedged item in the income
  statement, and requires that a company must formally document, designate,
  and assess the effectiveness of transactions that receive hedge accounting
  treatment.
 
  Statement 133 is effective for fiscal years beginning after June 15, 1999.
  A company may also implement the Statement as of the beginning of any
  quarter after issuance. Statement 133 cannot be applied retroactively.
  Statement 133 must be applied to (a) derivative instruments and (b) certain
  derivative instruments embedded in hybrid contracts that were issued,
  acquired, or substantively modified after December 31, 1997 (and, at the
  company's election, before January 1, 1998).
 
                                      43
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
  The statement could increase volatility in earnings and other comprehensive
  income. The Corporation believes that based on their existing derivative
  instruments, the impact of adopting Statement 133 on its financial
  statements will not be material. The Corporation has not determined the
  timing or method of adoption.
 
2. Earnings Per Share
 
  A reconciliation of the numerators and denominators of the basic and diluted
per share computations are as follows (dollars and shares in thousands, except
per share data):
 
<TABLE>
<CAPTION>
                                                 Year Ended December 31, 1998
                                               --------------------------------
                                                              Average     Per-
                                                 Income       Shares     Share
                                               (Numerator) (Denominator) Amount
                                               ----------- ------------- ------
<S>                                            <C>         <C>           <C>
Net Income....................................  $301,323
Convertible Preferred Dividends...............    (6,603)
                                                --------
Basic Earnings Per Share
  Income Available to Common Shareholders.....  $294,720      105,810    $2.79
                                                                         =====
Effect of Dilutive Securities
  Convertible Preferred Stock.................     6,603        7,677
  Stock Option, Restricted Stock and
   Performance Plans..........................       --         1,753
                                                --------      -------
Diluted Earnings Per Share
  Income Available to Common Shareholders Plus
   Assumed Conversions........................  $301,323      115,240    $2.61
                                                                         =====
</TABLE>
 
<TABLE>
<CAPTION>
                                                 Year Ended December 31, 1997
                                               --------------------------------
                                                              Average     Per-
                                                 Income       Shares     Share
                                               (Numerator) (Denominator) Amount
                                               ----------- ------------- ------
<S>                                            <C>         <C>           <C>
Net Income....................................  $256,685
Convertible Preferred Dividends...............    (5,671)
                                                --------
Basic Earnings Per Share
  Income Available to Common Shareholders.....  $251,014       95,651    $2.62
                                                                         =====
Effect of Dilutive Securities
  Convertible Preferred Stock.................     5,671        7,208
  8.5% Convertible Debt.......................       233          469
  Stock Option, Restricted Stock and
   Performance Plans..........................       --         2,099
  Forward Repurchase Contract.................       --           120
                                                --------      -------
Diluted Earnings Per Share
  Income Available to Common Shareholders Plus
   Assumed Conversions........................  $256,918      105,547    $2.43
                                                                         =====
</TABLE>
 
                                      44
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
 
<TABLE>
<CAPTION>
                                                 Year Ended December 31, 1996
                                               --------------------------------
                                                              Average     Per-
                                                 Income       Shares     Share
                                               (Numerator) (Denominator) Amount
                                               ----------- ------------- ------
<S>                                            <C>         <C>           <C>
Net Income....................................  $206,635
Convertible Preferred Dividends...............    (3,827)
                                                --------
Basic Earnings Per Share
  Income Available to Common Shareholders.....  $202,808       95,629    $2.12
                                                                         =====
Effect of Dilutive Securities
  Convertible Preferred Stock.................     3,827        5,277
  8.5% Convertible Debt.......................     1,161        2,400
  Stock Option, Restricted Stock and
   Performance Plans..........................       --         1,724
  Forward Repurchase Contract.................       --             4
                                                --------      -------
Diluted Earnings Per Share
  Income Available to Common Shareholders Plus
   Assumed Conversions........................  $207,796      105,034    $1.98
                                                                         =====
</TABLE>
 
  Options to purchase shares of common stock not included in the computation
of diluted net income per share because the options' exercise price was
greater than the average market price of the common shares for the year ended
December 31, are as follows:
 
<TABLE>
<CAPTION>
Grant Date                              Exercise Price   1998     1997    1996
- ----------                              -------------- --------- ------- -------
<S>                                     <C>            <C>       <C>     <C>
06/05/96...............................    $28.333           --      --   27,071
12/12/96...............................     31.875           --      --  789,050
10/01/97...............................     50.125           --    3,500     --
12/11/97...............................     57.000       954,350 996,450     --
04/28/98...............................     57.625        59,000     --      --
06/11/98...............................     53.719         8,000     --      --
                                                       --------- ------- -------
    Total Options Excluded from Earnings Per Share     1,021,350 999,950 816,121
                                                       ========= ======= =======
</TABLE>
 
3. Business Combinations
 
  The Corporation has consummated the following business combinations during
the three years ended December 31, 1998:
 
<TABLE>
<CAPTION>
                                                     Consideration
                                                  -------------------
                                                             Common   Method of
Organization                    Date Consummated    Cash     Stock    Accounting
- ------------                    ----------------- -------- ---------- ----------
<S>                             <C>               <C>      <C>        <C>
Moneyline Express.............. December 31, 1998 $  6,750        --   Purchase
Advantage Bancorp, Inc......... April 1, 1998          --   3,981,152  Pooling
Security Capital Corporation... October 1, 1997    375,806 12,324,210  Purchase
EastPoint Technology, Inc...... August 7, 1996      25,508        --   Purchase
</TABLE>
 
  Moneyline Express, Inc. ("Moneyline"), is a wholly-owned subsidiary of
Travelers Express Company, Inc. that specializes in electronic bill payment.
Moneyline provides consumer bill-payment processing to more than 700 financial
institution customers including M&I's home-banking customers. The Corporation,
through its Data Services Division, acquired certain assets of Moneyline in a
cash transaction accounted for as a purchase. The total purchase price is
contingent on the attainment of agreed-upon objectives.
 
                                      45
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
  The April 1, 1998 merger of Advantage Bancorp, Inc. ("Advantage") with and
into the Corporation was a tax-free reorganization accounted for as a pooling
of interests. In accordance with the terms of the merger, each share of
Advantage Common Stock was converted into a right to receive 1.2 shares of the
Corporation's Common Stock.
 
  The accompanying consolidated financial statements have been restated to
give effect to the merger with Advantage. Certain adjustments have been made
to conform the presentation of Advantage's information with that of the
Corporation. A reconciliation of net interest income and net income of the
Corporation as previously reported for that period in the accompanying
Consolidated Financial Statements as restated for the 1998 pooling of
interests is as follows:
 
<TABLE>
<CAPTION>
                                                                 Year Ended
                                                                December 31,
                                                              -----------------
                                                                1997     1996
                                                              -------- --------
                                                                 (Unaudited)
      <S>                                                     <C>      <C>
      Net Interest Income:
      Corporation, as previously reported.................... $564,047 $505,719
      Advantage Bancorp, Inc.................................   30,500   30,122
                                                              -------- --------
      Combined............................................... $594,547 $535,841
                                                              ======== ========
      Net Income:
      Corporation, as previously reported.................... $245,144 $203,430
      Advantage Bancorp, Inc.................................   11,541    3,205
                                                              -------- --------
      Combined............................................... $256,685 $206,635
                                                              ======== ========
</TABLE>
 
  In conjunction with this transaction the Corporation recorded a
merger/restructuring charge of $23.4 million ($16.3 million after-tax). The
table below summarizes the merger/restructuring charge recorded on April 1,
1998:
 
<TABLE>
<CAPTION>
                                                                    $ in Millions
                                                                    -------------
      <S>                                                           <C>
      Severance & Benefits.........................................     $15.4
      Investment Advisor & Other Professional Fees.................       3.1
      System Conversion & Contract Cancellation Fees...............       2.4
      Facilities & Equipment.......................................       1.9
      Other........................................................        .6
                                                                        -----
          Total Merger/Restructuring Charge........................     $23.4
                                                                        =====
</TABLE>
 
  Severance and benefits include non-cash accelerated benefit vesting of $10.4
million for stock options, $1.2 million for an employee stock ownership plan
(ESOP) and $0.4 million for a bank incentive stock plan. A portion of the
expense was credited to additional paid-in capital. Executive employment
contract payouts were $1.9 million. Severance and retention payments amounted
to $1.5 million. Accrued employment contract and severance expenses included
costs for 114 employees that were not given permanent employment with the
Corporation subsequent to the merger in accordance with the approved plan for
the on-going activities of the combined company. Severance associated with
involuntary terminations was based on M&I's severance policies which was
communicated to all affected employees. All severance was paid in 1998.
 
  Investment advisor fees were $2.0 million and other legal, accounting and
consulting fees were $1.1 million. All professional fees represent amounts
incurred to consummate the merger.
 
                                      46
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
  System conversion costs of $1.5 million represent costs associated with the
one time conversion and standardization of Advantage's records to M&I's data
processing systems. Contract cancellation fees mainly represent fees paid to
service bureaus for early termination of Advantage's long term data processing
contracts.
 
  As part of the merger, duplicative branch, loan production and
administrative facilities were closed and will be sold and in the case of
leases, terminated. In addition, certain excess furniture, computer and other
equipment is in the process of being disposed of.
 
  The plan for the on-going activities of the combined company is
substantially complete and there have not been any material adjustments to the
merger/restructuring charge.
 
  Security Capital Corporation ("Security") was the parent of Security Bank
S.S.B., a community-oriented financial institution. At September 30, 1997,
Security had consolidated assets of approximately $3.6 billion and
consolidated total deposits of approximately $2.3 billion.
 
  This merger was accounted for using the purchase method of accounting. Total
consideration to Security shareholders was approximately $860 million
consisting of cash and Common Stock of the Corporation. Identifiable
intangibles recorded in the transaction amounted to $48.7 million and
consisted of core deposit premiums which are being amortized on an accelerated
basis over approximately ten years and mortgage servicing rights. The amount
of goodwill recorded in the transaction amounted to $255.0 million and is
being amortized on a straight-line basis over twenty five years.
 
  The merger with Security was an in-market acquisition which entailed a
significant amount of customer service and operating overlap. The plan for the
on-going activities of the combined company, as approved, included the
involuntary termination of certain Security employees across all groups,
closure of the majority of Security branch and operations facilities, and
termination of certain duplicative service contracts such as data processing
contracts. Severance associated with involuntary terminations was based on the
severance plan contained in the merger agreement which was communicated to all
affected employees.
 
  The plan is substantially complete except for the disposal of 8 remaining
closed facilities and $4.0 million remaining employment contracts and
severance which will be paid over the terms of the severance agreements.
 
  Such exit costs recognized as liabilities assumed in the merger consisted of
the following:
 
<TABLE>
<CAPTION>
                                                                   $ in Millions
                                                                   -------------
      <S>                                                          <C>
      Employment Contracts and Severance from Involuntary
       Terminations...............................................     $15.8
      Lease Terminations/Buyouts..................................       1.6
      Service Contract Terminations/Buyouts (primarily data
       processing)................................................       1.2
                                                                       -----
          Total Liabilities Recognized for Exit Costs.............     $18.6
                                                                       =====
</TABLE>
 
  There have not been any material adjustments to the exit cost liabilities
assumed in the merger and there are no known unresolved issues that would
affect the purchase cost allocations.
 
  EastPoint Technology, Inc., purchased in 1996, is a software development
company specializing in client/server technology. The allocation of the
purchase price to the various classes of assets was determined on the basis of
an opinion expressed by a nationally recognized independent appraisal firm.
The value determined for in-process research and development, where
technological feasibility had not yet been established or was not believed to
have an alternative future use, was immediately expensed while the values of
completed technology and other assets, including the resulting goodwill, are
being amortized over their estimated useful lives.
 
  Acquired in-process research and development expensed during 1996 amounted
to $12.1 million and is included in other expense in the Consolidated
Statements of Income.
 
                                      47
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
  The results of operations for the acquired companies accounted for as
purchases are included in the Consolidated Financial Statements from the dates
of acquisition. The information below presents, on a pro forma basis, certain
historical information for the Corporation, adjusted for the Security
transaction, as if the transaction had been consummated on the first of
January of the indicated year.
 
<TABLE>
<CAPTION>
                                                           Year Ended December
                                                                   31,
                                                          ---------------------
                                                             1997       1996
                                                          ---------- ----------
                                                               (Unaudited)
      <S>                                                 <C>        <C>
      Pro Forma Corporation and Security
        Total Revenues (Interest Income plus Other
         Income)......................................... $2,042,753 $1,800,923
        Net Income.......................................    218,829    202,056
        Net Income Per Share
          Basic.......................................... $     2.03 $     1.84
          Diluted........................................       1.90       1.73
</TABLE>
 
  The pro forma net income shown above for 1997 includes certain merger
related expenses incurred by Security prior to consummation of the merger.
Merger related expenses, net of gains from required branch divestitures,
incurred by Security in 1997, prior to the merger, were approximately $47.5
million on an after tax basis or approximately $0.41 on a diluted per share
basis.
 
4. Cash and Due from Banks
 
  At December 31, 1998, $146,275 of cash and due from banks was restricted,
primarily due to requirements of the Federal Reserve System to maintain
certain reserve balances.
 
5. Other Short-term Investments
 
  Other short-term investments at December 31 were:
 
<TABLE>
<CAPTION>
                                                                 1998    1997
                                                                ------- -------
      <S>                                                       <C>     <C>
      Commercial paper......................................... $21,400 $ 6,950
      Interest bearing deposits in other banks.................  30,571  30,068
                                                                ------- -------
          Total other short-term investments................... $51,971 $37,018
                                                                ======= =======
</TABLE>
 
6. Securities
 
  The book and market values of securities at December 31 were:
 
<TABLE>
<CAPTION>
                                           1998                  1997
                                   --------------------- ---------------------
                                   Amortized    Market   Amortized    Market
                                      Cost      Value       Cost      Value
                                   ---------- ---------- ---------- ----------
<S>                                <C>        <C>        <C>        <C>
Investment Securities Available
 for Sale:
  U.S. Treasury and government
   agencies....................... $3,658,730 $3,723,703 $3,882,574 $3,930,884
  States and political
   subdivisions...................        147        148        485        487
  Mortgage backed securities......    153,892    154,306     31,449     31,816
  Other...........................    145,614    171,264    212,501    245,429
                                   ---------- ---------- ---------- ----------
    Total......................... $3,958,383 $4,049,421 $4,127,009 $4,208,616
                                   ========== ========== ========== ==========
Investment Securities Held to
 Maturity:
  U.S. Treasury and government
   agencies....................... $      --  $      --  $  168,665 $  171,537
  States and political
   subdivisions...................  1,051,565  1,090,380    925,644    948,870
  Other...........................      4,668      4,668     82,379     83,465
                                   ---------- ---------- ---------- ----------
    Total......................... $1,056,233 $1,095,048 $1,176,688 $1,203,872
                                   ========== ========== ========== ==========
</TABLE>
 
 
                                      48
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
  The unrealized gains and losses of securities at December 31 were:
 
<TABLE>
<CAPTION>
                                           1998                  1997
                                   --------------------- ---------------------
                                   Unrealized Unrealized Unrealized Unrealized
                                     Gains      Losses     Gains      Losses
                                   ---------- ---------- ---------- ----------
<S>                                <C>        <C>        <C>        <C>
Investment Securities Available
 for Sale:
  U.S. Treasury and government
   agencies.......................  $72,791     $7,818    $64,861    $16,551
  States and political
   subdivisions...................        1        --           3          1
  Mortgage backed securities......      489         75        367        --
  Other...........................   25,831        181     33,227        299
                                    -------     ------    -------    -------
    Total.........................  $99,112     $8,074    $98,458    $16,851
                                    =======     ======    =======    =======
Investment Securities Held to
 Maturity:
  U.S. Treasury and government
   agencies.......................  $   --      $  --     $ 3,126    $   254
  States and political
   subdivisions...................   38,906         91     23,542        316
  Other...........................      --         --       1,240        154
                                    -------     ------    -------    -------
    Total.........................  $38,906     $   91    $27,908    $   724
                                    =======     ======    =======    =======
</TABLE>
 
  The book value and market value of securities by contractual maturity at
December 31, 1998 were:
 
<TABLE>
<CAPTION>
                                     Investment Securities Investment Securities
                                      Available for Sale     Held to Maturity
                                     --------------------- ---------------------
                                     Amortized    Market   Amortized    Market
                                        Cost      Value       Cost      Value
                                     ---------- ---------- ---------- ----------
   <S>                               <C>        <C>        <C>        <C>
   Within one year.................. $1,316,165 $1,337,059 $   56,683 $   57,051
   From one through five years......  2,331,250  2,373,215    274,608    282,334
   From five through ten years......    167,256    169,894    340,026    354,671
   After ten years..................    143,712    169,253    384,916    400,992
                                     ---------- ---------- ---------- ----------
       Total........................ $3,958,383 $4,049,421 $1,056,233 $1,095,048
                                     ========== ========== ========== ==========
</TABLE>
 
  The gross realized gains and losses amounted to $31,421 and $638 in 1998,
$14,976 and $10,849 in 1997, and $23,045 and $7,574 in 1996, respectively.
 
  At December 31, 1998, securities with a value of approximately $859,418 were
pledged to secure public deposits, short-term borrowings, and for other
purposes required by law.
 
  During 1998 and 1997, approximately $259 million and $218 million,
respectively, of adjustable rate mortgage loans (ARMs) were securitized and
transferred to investment securities available for sale. The Corporation has
agreed to guarantee the first 4% of the loan pools securitized through
government agencies against potential loss. Since inception of the program,
approximately $1,155 million of ARMs have been securitized by M&I and no
losses have been incurred. These are noncash transactions for purposes of the
Consolidated Statements of Cash Flows.
 
                                      49
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
7. Loans and Leases
 
  Loans and Leases at December 31 were:
 
<TABLE>
<CAPTION>
                                                           1998        1997
                                                        ----------- -----------
      <S>                                               <C>         <C>
      Commercial, financial, and agricultural.......... $ 4,077,837 $ 3,395,227
      Real estate:
        Construction...................................     425,442     458,670
        Residential mortgage...........................   4,045,022   4,146,416
        Commercial mortgage............................   3,667,924   3,450,897
      Personal.........................................   1,166,541   1,161,608
      Lease financing..................................     613,400     489,094
                                                        ----------- -----------
          Total loans and leases....................... $13,996,166 $13,101,912
                                                        =========== ===========
</TABLE>
 
  The Corporation's lending activities are concentrated primarily in the
Midwest. Approximately 4% of its portfolio consists of loans granted to
customers located in Arizona. The Corporation had $0.3 million in foreign
credits at December 31, 1998. The Corporation's loan portfolio consists of
business loans extending across many industry types, as well as loans to
individuals. As of December 31, 1998, total loans to any group of customers
engaged in similar activities and having similar economic characteristics, as
defined by standard industrial classifications, did not exceed 10% of total
loans.
 
  The Corporation evaluates the credit risk of each customer on an individual
basis and, where deemed appropriate, collateral is obtained. Collateral varies
by individual loan customer but may include accounts receivable, inventory,
real estate, equipment, deposits, personal and government guaranties, and
general security agreements. Access to collateral is dependent upon the type
of collateral obtained. On an on-going basis, the Corporation monitors its
collateral and the collateral value related to the loan balance outstanding.
 
  An analysis of loans outstanding to directors and officers, including their
related interests, of the Corporation and its significant subsidiaries for
1998 is presented below. All of these loans were made in the ordinary course
of business with normal credit terms, including interest rates and collateral.
The beginning balance has been adjusted to reflect the activity of newly-
appointed directors and executive officers.
 
  Loans to Directors and Executive Officers:
 
<TABLE>
      <S>                                                             <C>
      Balance, beginning of year....................................  $ 170,408
      New loans.....................................................    194,539
      Repayments....................................................   (125,459)
                                                                      ---------
      Balance, end of year..........................................  $ 239,488
                                                                      =========
</TABLE>
 
8. Allowance for Loan and Lease Losses
 
  An analysis of the allowance for loan and lease losses follows:
 
<TABLE>
<CAPTION>
                                                     1998      1997      1996
                                                   --------  --------  --------
      <S>                                          <C>       <C>       <C>
      Balance, beginning of year.................. $208,651  $161,659  $166,815
      Allowance of banks acquired.................      --     42,773       --
      Provision charged to expense................   27,090    17,633    15,634
      Loan securitization transfer................      --        --       (440)
      Charge-offs.................................  (20,945)  (21,502)  (28,540)
      Recoveries..................................   11,256     8,088     8,190
                                                   --------  --------  --------
      Balance, end of year........................ $226,052  $208,651  $161,659
                                                   ========  ========  ========
</TABLE>
 
 
                                      50
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
  As of December 31, 1998 and 1997, nonaccrual loans and leases totaled
$101,346 and $66,945, respectively.
 
  At December 31, 1998 and 1997 the Corporation's recorded investment in
impaired loans and leases and the related valuation allowance are as follows:
 
<TABLE>
<CAPTION>
                                              1998                 1997
                                      -------------------- --------------------
                                       Recorded  Valuation  Recorded  Valuation
                                      Investment Allowance Investment Allowance
                                      ---------- --------- ---------- ---------
<S>                                   <C>        <C>       <C>        <C>
Total impaired loans and leases
 (Nonaccrual and renegotiated).......  $102,324             $ 68,283
Loans and leases excluded from
 individual evaluation...............   (39,655)             (39,827)
                                       --------             --------
Impaired loans evaluated.............  $ 62,669             $ 28,456
                                       ========             ========
Valuation allowance required.........  $  4,132    $836     $  6,124   $2,666
No valuation allowance required......    58,537     --        22,332      --
                                       --------    ----     --------   ------
Impaired loans evaluated.............  $ 62,669    $836     $ 28,456   $2,666
                                       ========    ====     ========   ======
</TABLE>
 
  The recorded investment in impaired loans for which no allowance is required
is net of applications of cash interest payments and net of previous direct
writedowns of $4,813 in 1998 and $6,137 in 1997 against the loan balance
outstanding. The required valuation allowance is included in the allowance for
loan and lease losses in the Consolidated Balance Sheets.
 
  The average recorded investment in total impaired loans and leases for the
years ended December 31, 1998 and 1997 amounted to $81,154 and $66,285,
respectively.
 
  Interest payments received on impaired loans and leases are recorded as
interest income unless collection of the remaining recorded investment is
doubtful at which time payments received are recorded as reductions of
principal. Interest income recognized on total impaired loans and leases
amounted to $6,808 in 1998, $3,678 in 1997, and $6,585 in 1996. The gross
income that would have been recognized had such loans and leases been
performing in accordance with their original terms would have been $8,795 in
1998, $6,328 in 1997, and $10,074 in 1996.
 
9. Premises and Equipment
 
  The composition of premises and equipment at December 31 was:
 
<TABLE>
<CAPTION>
                                                                1998     1997
                                                              -------- --------
      <S>                                                     <C>      <C>
      Land................................................... $ 46,557 $ 45,823
      Buildings and leasehold improvements...................  312,349  295,350
      Furniture and equipment................................  405,303  369,353
                                                              -------- --------
                                                               764,209  710,526
      Less accumulated depreciation..........................  403,864  359,103
                                                              -------- --------
          Total premises and equipment....................... $360,345 $351,423
                                                              ======== ========
</TABLE>
 
  Depreciation expense was $66,107 in 1998, $59,254 in 1997, and $53,726 in
1996.
 
  The Corporation leases certain of its facilities and equipment. Rent expense
under such operating leases was $39,338 in 1998, $30,723 in 1997, and $26,263
in 1996, respectively.
 
                                      51
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
  The future minimum lease payments under operating leases that have initial
or remaining noncancellable lease terms in excess of one year for 1999 through
2003 are $15,902, $11,465, $8,673, $7,017, and $6,477, respectively.
 
10. Deposits
 
  The composition of deposits at December 31 was:
 
<TABLE>
<CAPTION>
                                                           1998        1997
                                                        ----------- -----------
      <S>                                               <C>         <C>
      Noninterest bearing demand....................... $ 2,929,195 $ 2,753,320
      Savings and NOW..................................   6,768,523   5,858,845
      Other time deposits $100 and over................   1,508,619   1,463,643
      Other time deposits under $100...................   4,713,582   4,944,520
                                                        ----------- -----------
          Total deposits............................... $15,919,919 $15,020,328
                                                        =========== ===========
</TABLE>
 
  At December 31, 1998, the scheduled maturities for other time deposits were:
 
<TABLE>
      <S>                                                             <C>
      1999........................................................... $4,932,838
      2000...........................................................    648,233
      2001...........................................................    224,404
      2002...........................................................     85,476
      2003 and thereafter............................................    331,250
                                                                      ----------
                                                                      $6,222,201
                                                                      ==========
</TABLE>
 
11. Short-term Borrowings
 
  Short-term borrowings at December 31 were:
 
<TABLE>
<CAPTION>
                                                            1998       1997
                                                         ---------- ----------
      <S>                                                <C>        <C>
      Funds purchased and security repurchase
       agreements....................................... $1,712,165 $1,486,665
      U.S. Treasury demand notes........................     58,618    229,245
      Commercial paper..................................     60,162    109,586
      Current maturities of long-term borrowings........    242,735    204,322
      Other.............................................      3,605     17,268
                                                         ---------- ----------
          Total short-term borrowings................... $2,077,285 $2,047,086
                                                         ========== ==========
</TABLE>
 
  Unused lines of credit, primarily to support commercial paper borrowings,
were $40,000 at December 31, 1998 and 1997, respectively.
 
                                      52
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
12. Long-term Borrowings
 
  Long-term borrowings at December 31 were:
<TABLE>
<CAPTION>
                                                             1998       1997
                                                          ---------- ----------
      <S>                                                 <C>        <C>
      Corporation:
      6.375% subordinated notes due in 2003.............. $   99,654 $   99,590
      Medium-term Series B, C and D notes................    101,930    103,680
      7.65% cumulative company-obligated mandatorily
       redeemable capital trust pass-through securities..    199,096    199,063
      Other..............................................     13,090     15,676
      Subsidiaries:
      Borrowings from Federal Home Loan Bank (FHLB):
        Floating rate advances...........................    300,000    350,000
        Fixed rate advances..............................    280,487    287,677
      Nonrecourse notes..................................     26,830     27,704
      9.75% obligation under capital lease due through
       2006..............................................      3,825      4,145
      Other..............................................     12,305     12,323
                                                          ---------- ----------
                                                           1,037,217  1,099,858
      Less current maturities............................    242,735    204,322
                                                          ---------- ----------
          Total long-term borrowings..................... $  794,482 $  895,536
                                                          ========== ==========
</TABLE>
 
  The 6.375% subordinated notes are not redeemable prior to maturity and
qualify as "Tier 2" or supplementary capital for regulatory capital purposes.
Interest is payable semiannually.
 
  The Corporation has filed registration statements with the Securities and
Exchange Commission to issue medium-term unsecured and unsubordinated series
notes. These issues may have maturities which range from 9 months to 30 years
from the date of issue, at a fixed or floating rate.
 
  At December 31, 1998, there were $27,130 of medium-term Series C notes
outstanding. The medium-term Series C notes have fixed interest rates of 6.26%
to 6.75% and mature at various amounts and times through 2002. No additional
borrowings may occur under the Series C notes. At December 31, 1998, medium-
term Series D notes outstanding amounted to $74,800 with fixed interest rates
of 6.11% to 6.64%. Series D notes mature at various times and amounts in 1999
through 2002. Approximately $75.2 million of unissued Series D notes are
remaining and available to be issued in the future.
 
  In December 1996, the Corporation formed M&I Capital Trust A (the "Trust")
and issued $200 million in liquidation or principal amount of cumulative
preferred capital securities. Holders of the capital securities are entitled
to receive cumulative cash distributions at an annual rate of 7.65% payable
semiannually.
 
  Concurrently with the issuance of the capital securities, the Trust invested
the proceeds, together with the consideration paid by the Corporation for the
common interest in the Trust, in junior subordinated deferrable interest
debentures ("subordinated debt") issued by the Corporation. The subordinated
debt, which represents the sole asset of the Trust, bears interest at an
annual rate of 7.65% payable semiannually and matures on December 1, 2026.
 
  The subordinated debt is junior in right of payment to all present and
future senior indebtedness of the Corporation. The Corporation may redeem the
subordinated debt in whole or in part at any time on or after December 1, 2006
at specified call premiums, and at par on or after December 1, 2016. In
addition, in certain circumstances the subordinated debt may be redeemed at
par upon the occurrence of certain events. The Corporation's right to redeem
the subordinated debt is subject to regulatory approval.
 
                                      53
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
  The Corporation has the right, subject to certain conditions, to defer
payments of interest on the subordinated debt for extension periods, each
period not exceeding ten consecutive semiannual periods. As a consequence of
the Corporation's extension of the interest payment period, distributions on
the capital securities would be deferred. In the event the Corporation
exercises its right to extend an interest payment period, the Corporation is
prohibited from making dividend or any other equity distributions during such
extension period.
 
  The payment of distributions, liquidation of the Trust or payment upon the
redemption of the capital securities are guaranteed by the Corporation.
 
  The Corporation, as owner of the common interest in the Trust, has the right
at any time to terminate the Trust, subject to certain conditions. In
circumstances other than maturity or redemption of the subordinated debt, the
subordinated debt would be distributed to the holders of the Trust securities
on a pro rata basis in liquidation of the holders' interests in the Trust.
 
  The capital securities qualify as "Tier 1" capital for regulatory capital
purposes.
 
  Fixed rate FHLB advances were assumed in conjunction with the April 1, 1998
Advantage merger and mature at various times in 1999 through 2007. A portion
of the advances are subject to periodic principal payments. $28.5 million may
be repaid without penalty at six month intervals. All other advances are
subject to a prepayment penalty if they are repaid prior to maturity.
Borrowings from FHLB were also assumed in conjunction with the October 1, 1997
Security merger.
 
  The floating rate advances mature in increments of $50 million at various
times in 1999 through 2001. The interest rate is reset monthly based on the
London Interbank Offered Rate (LIBOR). One floating rate advance in the amount
of $50 million is callable by FHLB semiannually after November 1997 upon ten
days notice. The fixed rate advances have interest rates which range from
5.03% to 8.86% and mature at various times in 1999 through 2012. A portion of
the fixed rate advances are subject to periodic principal payments. Fixed rate
advances in the amount of $100 million are callable every three months
beginning in February 1998 upon five days notice. A portion of the FHLB
borrowings can be prepaid.
 
  The Corporation is required to maintain unencumbered first mortgage loans
and mortgage-related securities such that the outstanding balance of FHLB
advances does not exceed 60% of the book value of this collateral. In
addition, a portion of these advances are collaterized by all FHLB stock.
 
  The nonrecourse notes are reported net of prepaid interest and represent
borrowings by the leasing subsidiary from banks and other financial
institutions. These notes have a weighted average interest rate of 8.44% at
December 31, 1998 and are due in installments over varying periods through
2005. Lease financing receivables at least equal to the amount of the notes
are pledged as collateral.
 
  During 1997, $16,819 of the Corporation's 8.5% convertible subordinated
notes were converted by the holder into 1,922,114 shares of the Corporation's
common stock. The common stock acquired by the conversions of the notes were
exchanged for 168,185 shares of the Corporation's Series A convertible
preferred stock. These are noncash transactions for purposes of the
Consolidated Statements of Cash Flows.
 
  Scheduled maturities of long-term borrowings are: $313,874, $139,665,
$28,638, and $102,376 for 2000 through 2003, respectively.
 
13. Shareholders' Equity
 
  The Corporation has 5,000,000 shares of preferred stock authorized, of which
the Board of Directors has designated 2,000,000 shares as Series A
convertible, with a $100 value per share for conversion purposes. Series
 
                                      54
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
A is nonvoting preferred stock. The same cash dividends will be paid on Series
A as would have been paid on the common stock exchanged for Series A. Except
under limited circumstances, the holder may not sell, transfer or otherwise
dispose of stock acquired by conversion, and then, only under prescribed
conditions and subject to the Corporation's right of first refusal.
 
  The holder has the option to convert Series A into common stock at the same
ratio that the common stock was exchanged for Series A. The Corporation has
issued 685,314 shares of its Series A convertible preferred stock in exchange
for 7,677,185 shares of common stock.
 
  The preferred stock is treated as a common stock equivalent in all
applicable per share calculations.
 
  In 1998, the Corporation began sponsoring a deferred compensation plan for
its non-employee directors and the non-employee directors of its affiliates.
Participants may elect to have their deferred fees used to purchase M&I common
stock with dividend reinvestment. Such shares will be distributed to plan
participants in accordance with the plan provisions. At December 31, 1998,
246,854 shares of M&I common stock were held in a grantor trust. The aggregate
cost of such shares is included in Deferred Compensation as a reduction of
shareholders' equity in the Consolidated Balance Sheets and amounted to
$12,608 at December 31, 1998.
 
  In conjunction with the Security merger, the Corporation assumed certain
deferred compensation and nonqualified retirement plans for former directors
and executive officers of Security. At December 31, 1998 and 1997, 119,069 and
157,821 common shares of M&I Stock were maintained in a grantor trust with
such shares to be distributed to plan participants in accordance with the
provisions of the plans. The aggregate cost of such shares of $5,065 and
$6,166 at December 31, 1998 and 1997, respectively is included in Deferred
Compensation as a reduction of shareholders' equity in the Consolidated
Balance Sheets.
 
  Federal banking regulatory agencies have established capital adequacy rules
which take into account risk attributable to balance sheet assets and off-
balance sheet activities. All banks and bank holding companies must meet a
minimum total risk-based capital ratio of 8%. Of the 8% required, at least
half must be comprised of core capital elements defined as Tier 1 capital. The
federal banking agencies also have adopted leverage capital guidelines which
banking organizations must meet. Under these guidelines, the most highly rated
banking organizations must meet a minimum leverage ratio of at least 3% Tier 1
capital to total assets, while lower rated banking organizations must maintain
a ratio of at least 4% to 5%. Failure to meet minimum capital requirements can
initiate certain mandatory--and possibly additional discretionary--actions by
regulators that, if undertaken, could have a direct material effect on the
Consolidated Financial Statements.
 
  At December 31, 1998 and 1997, the most recent notification from the Federal
Reserve Board categorized the Corporation as well capitalized under the
regulatory framework for prompt corrective action. There are no conditions or
events since that notification that management believes have changed the
Corporation's category.
 
  To be well capitalized under the regulatory framework, the Tier 1 capital
ratio must meet or exceed 6%, the Total capital ratio must meet or exceed 10%
and the leverage ratio must meet or exceed 5%.
 
                                      55
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
  The Corporation's risk-based capital and leverage ratios are as follows ($
in millions):
 
<TABLE>
<CAPTION>
                                        Risk-Based Capital Ratios
                           ----------------------------------------------------
                            As of December 31, 1998    As of December 31, 1997
                           --------------------------  ------------------------
                                Amount        Ratio        Amount       Ratio
                           ---------------- ---------  -------------- ---------
<S>                        <C>              <C>        <C>            <C>
Tier 1 capital...........  $        2,059.9     12.78% $      1,821.7     12.34%
Tier 1 capital adequacy
 minimum requirement.....             644.8      4.00           590.5      4.00
                           ---------------- ---------  -------------- ---------
Excess...................  $        1,415.1      8.78% $      1,231.2      8.34%
                           ================ =========  ============== =========
Total capital............  $        2,341.7     14.53% $      2,106.5     14.27%
Total capital adequacy
 minimum requirement.....           1,289.6      8.00         1,180.9      8.00
                           ---------------- ---------  -------------- ---------
Excess...................  $        1,052.1      6.53% $        925.6      6.27%
                           ================ =========  ============== =========
Risk-adjusted assets.....  $       16,120.5            $     14,761.7
                           ================            ==============
<CAPTION>
                                             Leverage Ratio
                           ----------------------------------------------------
                            As of December 31, 1998    As of December 31, 1997
                           --------------------------  ------------------------
                                Amount        Ratio        Amount       Ratio
                           ---------------- ---------  -------------- ---------
<S>                        <C>              <C>        <C>            <C>
Tier 1 capital to
 adjusted total assets...  $        2,059.9      9.86% $      1,821.7      9.21%
Minimum leverage adequacy
 requirement.............     626.9-1,044.8 3.00-5.00     593.5-989.2 3.00-5.00
                           ---------------- ---------  -------------- ---------
Excess...................  $1,433.0-1,015.1 6.86-4.86% $1,228.2-832.5 6.21-4.21%
                           ================ =========  ============== =========
Adjusted average total
 assets..................  $       20,896.2            $     19,784.3
                           ================            ==============
</TABLE>
 
  All of the Corporation's banking subsidiaries' risk-based capital and
leverage ratios meet or exceed the defined minimum requirements, and have been
deemed well capitalized as of December 31, 1998 and 1997. The following table
presents the risk-based capital ratios for the Corporation's significant
banking subsidiaries:
 
<TABLE>
<CAPTION>
                                                          Tier
           Subsidiary                                       1    Total  Leverage
           ----------                                     -----  -----  --------
      <S>                                                 <C>    <C>    <C>
      M&I Marshall & Ilsley Bank
        December 31, 1998................................  9.42% 10.67%   7.14%
        December 31, 1997................................ 10.56  11.85    7.95
      M&I Bank of Southern Wisconsin
        December 31, 1998................................  9.23  10.48    7.47
        December 31, 1997................................  9.65  10.90    7.70
</TABLE>
 
  Banking subsidiaries are restricted by banking regulations from making
dividend distributions above prescribed amounts and are limited in making
loans and advances to the Corporation. At December 31, 1998, the retained
earnings of subsidiaries available for distribution as dividends without
regulatory approval was approximately $139.2 million.
 
14. Income Taxes
 
  Total income tax expense for the years ended December 31, 1998, 1997, and
1996 was allocated as follows:
 
<TABLE>
<CAPTION>
                                                     1998      1997      1996
                                                   --------  --------  --------
      <S>                                          <C>       <C>       <C>
      Income before income taxes.................  $163,962  $131,487  $111,314
      Shareholders' Equity:
        Compensation expense for tax purposes in
         excess of amounts recognized for
         financial reporting purposes............   (13,846)  (15,704)   (6,527)
        Unrealized gains on investment securities
         available for sale......................     3,427    13,654     2,621
                                                   --------  --------  --------
                                                   $153,543  $129,437  $107,408
                                                   ========  ========  ========
</TABLE>
 
                                      56
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
  The current and deferred portions of the provision for income taxes were:
 
<TABLE>
<CAPTION>
                                                      1998      1997     1996
                                                    --------  -------- --------
      <S>                                           <C>       <C>      <C>
      Current:
        Federal.................................... $140,649  $109,942 $ 99,226
        State......................................   20,556     9,766   13,274
                                                    --------  -------- --------
                                                     161,205   119,708  112,500
      Deferred:
        Federal....................................    3,565     4,847   (1,682)
        State......................................     (808)    6,932      496
                                                    --------  -------- --------
                                                       2,757    11,779   (1,186)
                                                    --------  -------- --------
          Total provision for income taxes......... $163,962  $131,487 $111,314
                                                    ========  ======== ========
</TABLE>
 
  The following is a reconciliation between the amount of the provision for
income taxes and the amount of tax computed by applying the statutory Federal
income tax rate (35%):
 
<TABLE>
<CAPTION>
                                                    1998      1997      1996
                                                  --------  --------  --------
      <S>                                         <C>       <C>       <C>
      Tax computed at statutory rates............ $162,850  $135,860  $111,282
      Increase (decrease) in taxes resulting
       from:
        Federal tax-exempt income................  (15,836)  (13,224)   (9,547)
        State income taxes, net of Federal tax
         benefit.................................   13,082    10,853     9,079
        Other....................................    3,866    (2,002)      500
                                                  --------  --------  --------
          Total provision for income taxes....... $163,962  $131,487  $111,314
                                                  ========  ========  ========
</TABLE>
 
  The tax effects of temporary differences that give rise to significant
elements of the deferred tax assets and deferred tax liabilities at December
31, are as follows:
 
<TABLE>
<CAPTION>
                                                              1998      1997
                                                            --------  --------
      <S>                                                   <C>       <C>
      Deferred tax assets:
        Deferred compensation.............................. $ 29,856  $ 29,227
        Allowance for loan and lease losses................   82,922    74,853
        Accrued postretirement benefits....................   23,830    21,483
        Other..............................................   44,229    45,993
                                                            --------  --------
          Total deferred tax assets before valuation
           allowance.......................................  180,837   171,556
        Valuation allowance................................  (11,341)  (10,467)
                                                            --------  --------
          Net deferred tax assets..........................  169,496   161,089
      Deferred tax liabilities:
        Lease revenue reporting............................   61,317    40,754
        Deferred expense, net of unearned income...........   22,339    19,953
        Premises and equipment, principally due to
         depreciation......................................   15,090    18,115
        Pension funding versus expense.....................    5,234     5,105
        Purchase accounting adjustments....................   21,039    39,724
        Unrealized gains and losses........................   32,936    29,509
        Other..............................................   28,282    25,592
                                                            --------  --------
          Total deferred tax liabilities...................  186,237   178,752
                                                            --------  --------
          Net deferred tax liability....................... $ 16,741  $ 17,663
                                                            ========  ========
</TABLE>
 
 
                                      57
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
  The valuation allowance has been provided to reduce certain state deferred
tax assets to the amount of tax benefit management believes it will more
likely than not realize.
 
  The amount of income tax expense related to net securities gains or losses
amounted to $11,136, $1,630, and $6,441, in 1998, 1997, and 1996,
respectively.
 
15. Stock Option and Restricted Stock Plans
 
  The Corporation has Executive Stock Option and Restricted Stock Plans which
provide for the grant of nonqualified and incentive stock options, stock
appreciation rights and rights to purchase restricted shares to key employees
at prices ranging from not less than the par value of the common shares to the
market value of the shares at the date of grant.
 
  The nonqualified and incentive stock option plans generally provide for the
grant of options to purchase shares of the Corporation's common stock for a
period of ten years from the date of grant. Options granted generally become
exercisable over a period of two years from the date of grant however, options
granted to Directors of the Corporation vest immediately and options granted
after 1996 provide accelerated or immediate vesting for grants to individuals
who meet certain age and years of service criteria at the date of grant.
 
  Activity relating to nonqualified and incentive stock options was:
 
<TABLE>
<CAPTION>
                                                                     Weighted-
                                                                      Average
                                              Number    Option Price Exercise
                                            of Shares    Per Share     Price
                                            ----------  ------------ ---------
   <S>                                      <C>         <C>          <C>
   Shares under option at December 31,
    1995...................................  6,590,960  $ 5.19-26.19  $16.31
   Options granted.........................    881,392   25.63-31.88   31.33
   Options lapsed or surrendered...........    (70,038)   8.54-26.19   18.90
   Options exercised....................... (1,040,700)   5.19-26.19   12.85
                                            ----------  ------------  ------
   Shares under option at December 31,
    1996...................................  6,361,614  $ 5.19-31.88  $18.93
   Options granted.........................  1,635,755   11.56-57.00   40.10
   Options lapsed or surrendered...........    (35,338)  19.25-31.88   28.97
   Options exercised....................... (1,862,429)   5.19-31.88   13.53
                                            ----------  ------------  ------
   Shares under option at December 31,
    1997...................................  6,099,602  $ 7.67-57.00  $26.19
   Options granted.........................  1,312,150   45.88-57.63   52.06
   Options lapsed or surrendered...........    (59,003)   7.67-57.63   49.57
   Options exercised....................... (1,102,814)   7.67-40.13   15.01
                                            ----------  ------------  ------
   Shares under option at December 31,
    1998...................................  6,249,935  $ 7.67-57.63  $33.38
                                            ==========  ============  ======
</TABLE>
 
                                      58
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
  The range of options outstanding at December 31, 1998 were:
<TABLE>
<CAPTION>
                                                              Weighted-
                                                               Average
                                        Weighted-Average      Remaining
                Number of Shares         Exercise Price      Contractual
    Price    -----------------------    ----------------        Life
    Range    Outstanding Exercisable Outstanding Exercisable (In Years)
    -----    ----------- ----------- ----------- ----------- -----------
   <S>       <C>         <C>         <C>         <C>         <C>
   $ 5-12       429,783     429,783    $10.75      $10.75        1.3
    13-18       889,770     889,770     16.21       16.21        3.0
    19-25     1,350,412   1,350,412     20.73       20.73        5.3
    26-32     1,278,470   1,278,470     29.34       29.34        7.5
    33-50        39,000      31,500     39.24       37.82        8.6
   Over $50   2,262,500     779,600     54.15       55.46        9.5
              ---------   ---------    ------      ------        ---
              6,249,935   4,759,535    $33.38      $27.10        6.7
              =========   =========    ======      ======        ===
</TABLE>
 
  Options exercisable at December 31, 1997 and 1996 were 4,845,927 and
5,199,113, respectively. The weighted average exercise price for options
exercisable was $20.26 at December 31, 1997 and $16.47 at December 31, 1996.
 
  In October 1995, the Financial Accounting Standards Board issued Statement
of Financial Accounting Standards No. 123 (SFAS 123), "Accounting for Stock-
Based Compensation." This standard established financial accounting and
reporting standards for stock based employee compensation plans.
 
  SFAS 123 defines a fair value based method of accounting for employee stock
option or similar equity instruments. Under the fair value based method,
compensation cost is measured at the grant date based on the fair value of the
award using an option-pricing model that takes into account the stock price at
the grant date, the exercise price, the expected life of the option, the
volatility of the underlying stock, expected dividends and the risk-free
interest rate over the expected life of the option. The resulting compensation
cost is recognized over the service period, which is usually the vesting
period.
 
  Compensation cost can also be measured and accounted for using the intrinsic
value based method of accounting prescribed in Accounting Principles Board
Opinion No. 25 (APBO 25), "Accounting for Stock Issued to Employees." Under
the intrinsic value based method, compensation cost is the excess, if any, of
the quoted market price of the stock at grant date or other measurement date
over the amount paid to acquire the stock.
 
  The largest difference between SFAS 123 and APBO 25 as it relates to the
Corporation is the amount of compensation cost attributable to the
Corporation's fixed stock option plans. Under APBO 25 no compensation cost is
recognized for fixed stock option plans because the exercise price is equal to
the quoted market price at the date of grant and therefore there is no
intrinsic value. SFAS 123 compensation cost would equal the calculated fair
value of the options granted.
 
  As permitted by SFAS 123, the Corporation continues to measure compensation
cost for such plans using the accounting method prescribed by APBO 25.
 
                                      59
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
  Had compensation cost for the Corporation's options granted after January 1,
1995 been determined consistent with SFAS 123, the Corporation's net income
and earnings per share would have been reduced to the following pro forma
amounts:
 
<TABLE>
<CAPTION>
                                                       1998     1997     1996
                                                     -------- -------- --------
      <S>                                            <C>      <C>      <C>
      Net income
        As reported................................. $301,323 $256,685 $206,635
        Pro forma...................................  292,227  251,310  203,896
      Basic earnings per share
        As reported................................. $   2.79 $   2.62 $   2.12
        Pro forma...................................     2.70     2.57     2.09
      Diluted earnings per share
        As reported................................. $   2.61 $   2.43 $   1.98
        Pro forma...................................     2.54     2.39     1.96
</TABLE>
 
  The fair value of each option grant was estimated as of the date of grant
using the Black-Scholes option pricing model. The resulting compensation cost
was amortized over the vesting period. The fair value of options assumed in
the Security merger were included in the determination of total consideration.
No compensation cost associated with such options was included in determining
pro forma net income in 1998 and 1997.
 
  The grant date fair values and assumptions used to determine such value are
as follows:
 
<TABLE>
<CAPTION>
                                           1998         1997         1996
                                        -----------  -----------  -----------
      <S>                               <C>          <C>          <C>
      Weighted-average grant date fair
       value........................... $     13.31  $     14.80  $      8.17
      Assumptions:
        Risk-free interest rates.......   4.53-5.88%   5.75-6.81%   5.48-6.91%
        Expected volatility............ 18.38-22.01% 17.03-18.47% 19.30-20.72%
        Expected term (in years).......         6.0          6.0          6.0
        Expected dividend yield........        1.69%        1.42%        2.25%
</TABLE>
 
  Activity relating to the Corporation's Restricted Purchase Rights was:
 
<TABLE>
<CAPTION>
                                                          December 31
                                                   ---------------------------
                                                     1998      1997     1996
                                                   --------  --------  -------
      <S>                                          <C>       <C>       <C>
      Restricted stock purchase rights
       outstanding--Beginning of Year............    10,500    15,000    5,000
      Restricted stock purchase rights granted...    20,250    14,000   19,000
      Restricted stock purchase rights exercised.   (30,750)  (18,500)  (9,000)
                                                   --------  --------  -------
      Restricted stock purchase rights
       outstanding--End of Year..................       --     10,500   15,000
      Weighted-average grant date market value...  $  56.40  $  54.08  $ 30.08
      Aggregate compensation expense.............  $    556  $    474  $   444
      Unamortized deferred compensation..........  $  1,964  $    966  $   825
</TABLE>
 
  Restrictions on stock issued pursuant to the exercise of stock purchase
rights lapse within a seven year period. Accordingly, the compensation related
to issuance of the rights is deferred and amortized over the vesting period.
Unamortized deferred compensation is reflected as a reduction of shareholders'
equity.
 
  Shares reserved for the granting of options and stock purchase rights at
December 31, 1998 were 3,363,939.
 
 
                                      60
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
  The Corporation also has a Long-term Incentive Plan. Under the plan,
performance units may be awarded from time to time. Once awarded, additional
performance units will be credited to each participant based on dividends paid
by the Corporation on its common stock. At the end of a designated vesting
period, participants will receive an amount equal to some percent (0%-275%) of
the initial performance units credited plus those additional units credited as
dividends based on the established performance criteria. Units awarded to
certain executives of the Corporation were 103,250 in 1998, 104,750 in 1997,
and 88,650 in 1996. The vesting period is three years from the date the
performance units were awarded. At December 31, 1998, based on the performance
criteria, without regard to the vesting, approximately $5,679 would be due to
the participants under the 1997 and 1998 awards. In addition, the amount
payable to participants under the 1996 award which was fully vested, was
$4,147 at December 31, 1998.
 
  Compensation expense in 1998 associated with the accelerated vesting of
Advantage's stock options outstanding amounted to $10,372 which is included in
Merger/Restructuring in the Consolidated Statements of Income.
 
16. Employee Retirement and Health Plans
 
  The Corporation has a defined contribution retirement plan and an incentive
savings plan for substantially all employees. The retirement plan provides for
a guaranteed contribution to eligible participants equal to 2% of
compensation. At the Corporation's option, a profit sharing amount may also be
contributed and may vary from year to year up to a maximum of 6% of eligible
compensation. Under the incentive savings plan, employee contributions up to
6% of eligible compensation are matched up to 50% by the Corporation based on
the Corporation's return on equity as defined by the plan. Total expense
relating to these plans was $32,108, $31,804, and $24,410 in 1998, 1997, and
1996, respectively.
 
  The Corporation also has supplemental retirement plans to provide retirement
benefits to certain of its key executives. Total expense relating to these
plans amounted to $1,393 in 1998, $1,567 in 1997, and $1,456 in 1996.
 
  Security sponsored a trusteed defined benefit pension plan, and defined
contribution ESOP plan for substantially all of its employees. In conjunction
with the merger, such plans were terminated for accounting purposes. During
1998, distributions of approximately $91.1 million were made to former
participants of the plans in the form of lump sum payments and annuity
purchases. Final distributions to former participants in the plan are in the
process of being completed. Security also sponsored a defined contribution
401(k) plan that merged with the Corporation's incentive savings plan in
October of 1998.
 
  Advantage also sponsored a defined contribution ESOP plan for substantially
all of its employees. In conjunction with the merger, such plan was terminated
and distributions were made to the former participants in the plan. Advantage
sponsored a defined contribution 401(k) plan that merged with the
Corporation's incentive savings plan at October 1, 1998. Total expense
relating to these plans amounted to $127, $319, and $325 in 1998, 1997 and
1996, respectively. In addition, expense associated with the termination of
the ESOP in 1998 amounted to $1,246 which is included in Merger/Restructuring
in the Consolidated Statements of Income.
 
  The Corporation sponsors a defined benefit health plan that provides health
care benefits to eligible current and retired employees. Eligibility for
retiree benefits is dependent upon age, years of service, and participation in
the health plan during active service. The plan is contributory and in 1997
the plan was amended. Employees hired or retained from mergers after September
1, 1997 will be granted access to the Corporation's plan upon retirement
however, such retirees must pay 100% of the cost of health care benefits. The
plan continues to contain other cost-sharing features such as deductibles and
coinsurance. The plan is not funded.
 
                                      61
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
  The changes during the year of the accumulated postretirement benefit
obligation (APBO) for retiree health benefits are as follows:
 
<TABLE>
<CAPTION>
                                                               1998     1997
                                                              -------  -------
      <S>                                                     <C>      <C>
      APBO, beginning of year................................ $51,702  $43,495
      Service cost...........................................   3,475    2,794
      Interest cost on APBO..................................   3,804    3,158
      Plan amendments........................................     --    (2,264)
      Actuarial (gains) / losses.............................  (8,268)   4,490
      Change due to acquisitions/divestitures................     (58)   1,154
      Benefits paid..........................................  (1,479)  (1,125)
                                                              -------  -------
      APBO, end of year......................................  49,176   51,702
      Unrecognized net gain / (loss).........................   5,100   (3,168)
      Unrecognized prior service cost........................   1,992    2,197
                                                              -------  -------
      Accrued postretirement benefit cost.................... $56,268  $50,731
                                                              =======  =======
      Weighted average discount rate used in determining
       APBO..................................................    7.00%    7.50%
                                                              =======  =======
</TABLE>
 
  The assumed health care cost trend for 1999 was 6.75%. The rate was assumed
to decrease gradually to 5.00% for 2006 and remain at that level thereafter.
 
  Net periodic postretirement benefit cost for the years ended December 31,
1998, 1997, and 1996 includes the following components:
 
<TABLE>
<CAPTION>
                                                          1998    1997    1996
                                                         ------  ------  ------
      <S>                                                <C>     <C>     <C>
      Service cost...................................... $3,475  $2,794  $3,553
      Interest on APBO..................................  3,804   3,158   3,322
      Net amortization and deferral.....................   (263)    (89)    146
                                                         ------  ------  ------
                                                         $7,016  $5,863  $7,021
                                                         ======  ======  ======
</TABLE>
 
  The assumed health care cost trend rate has a significant effect on the
amounts reported for the health care plans. A one percentage point change on
assumed health care cost trend rates would have the following effects:
 
<TABLE>
<CAPTION>
                                                            One        One
                                                         Percentage Percentage
                                                           Point      Point
                                                          Increase   Decrease
                                                         ---------- ----------
      <S>                                                <C>        <C>
      Effect on total of service and interest cost
       components.......................................   $1,416    $(1,146)
      Effect on postretirement benefit obligation.......    7,946     (6,430)
</TABLE>
 
                                      62
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
17. Financial Instruments with Off-Balance Sheet Risk
 
  Financial instruments with off-balance sheet risk at December 31 were:
 
<TABLE>
<CAPTION>
                                                            1998       1997
                                                         ---------- ----------
      <S>                                                <C>        <C>
      Financial instruments whose amounts represent
       credit risk:
        Commitments to extend credit:
          To commercial customers....................... $5,684,137 $5,036,705
          To individuals................................  1,368,879  1,233,196
        Standby letters of credit, net of
         participations.................................    426,905    383,510
        Commercial letters of credit....................     16,361     14,533
        Mortgage loans sold with recourse...............      2,502      3,419
      Financial instruments whose amounts exceed the
       amount of credit risk:
        Foreign exchange contracts:
          Commitments to purchase foreign exchange......    506,191    418,871
          Commitments to deliver foreign exchange.......    510,690    421,575
          Options written/purchased.....................      7,603      5,338
      Interest risk management instruments:
        Interest rate swaps.............................  1,017,000    665,000
        Interest rate floor.............................     25,000     25,000
        Interest rate cap...............................     25,000     25,000
</TABLE>
 
  Commitments to extend credit are agreements to lend to a customer as long as
there is no violation of any condition established in the contract.
Commitments generally have fixed expiration dates and may require payment of a
fee. The majority of the Corporation's commitments to extend credit generally
provide for the interest rate to be determined at the time the commitment is
utilized. Since many of the commitments are expected to expire without being
drawn upon, the total commitment amounts do not necessarily represent future
cash requirements.
 
  The Corporation evaluates each customer's credit worthiness on an individual
basis. Collateral obtained, if any, upon extension of credit, is based upon
management's credit evaluation of the customer. Collateral requirements and
the ability to access collateral is generally similar to that required on
loans outstanding as discussed in Note 7.
 
  Standby and commercial letters of credit are contingent commitments issued
by the Corporation to support the financial obligations of a customer to a
third party. Standby letters of credit are issued to support public and
private financing, and other financial or performance obligations of
customers. Commercial letters of credit are issued to support payment
obligations of a customer as buyer in a commercial contract for the purchase
of goods. Letters of credit have maturities which generally reflect the
maturities of the underlying obligations. The credit risk involved in issuing
letters of credit is the same as that involved in extending loans to
customers. If deemed necessary, the Corporation holds various forms of
collateral to support letters of credit.
 
  Certain mortgage loans sold to government agencies have limited recourse
provisions.
 
  Foreign exchange contracts are commitments to purchase or deliver foreign
currency at a specified exchange rate. The Corporation enters into foreign
exchange contracts primarily in connection with trading activities to enable
customers involved in international trade to hedge their exposure to foreign
currency fluctuations and to minimize the Corporation's own exposure to
foreign currency fluctuations resulting from the above. Foreign exchange
contracts include such commitments as foreign currency spot, forward, future
and, to a much lesser
 
                                      63
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
extent, option contracts. The risks in these transactions arise from the
ability of the counterparties to perform under the terms of the contracts and
the risk of trading in a volatile commodity. The Corporation actively monitors
all transactions and positions against predetermined limits established on
traders and types of currency to ensure reasonable risk taking.
 
  The Corporation's market risk from unfavorable movements in currency
exchange rates is minimized by essentially matching commitments to deliver
foreign currencies with commitments to purchase foreign currencies.
 
  At December 31, 1998, the Corporation's foreign currency position resulting
from foreign exchange contracts by major currency was as follows ($000's US):
 
<TABLE>
<CAPTION>
                                                        Commitments Commitments
                                                        To Deliver  To Purchase
                                                          Foreign     Foreign
                                                         Exchange    Exchange
                                                        ----------- -----------
      <S>                                               <C>         <C>
      Currency
      Deutsche Mark....................................  $135,168    $134,455
      English Pound Sterling...........................    90,363      90,132
      Japanese Yen.....................................    75,370      72,496
      Netherland Guilder...............................    62,876      62,850
      Swiss Franc......................................    29,471      29,333
      Canadian Dollar..................................    27,397      27,298
      Norwegian Kroner.................................    23,585      23,582
      French Franc.....................................    20,042      20,121
      Belgian Franc....................................    12,256      12,196
      Swedish Kronor...................................     9,763       9,761
      Australian Dollar................................     9,436       9,406
      Italian Lire.....................................     7,261       6,929
      Finnish Markka...................................     2,000       2,000
      New Zealand Dollar...............................     1,231       1,205
      Danish Kronor....................................     1,197       1,211
      Portuguese Escudo................................     1,184       1,183
      All Other........................................     2,090       2,033
                                                         --------    --------
          Total........................................  $510,690    $506,191
                                                         ========    ========
      Average Amount of Contracts To Deliver/Purchase
       Foreign Exchange................................  $598,852    $594,170
                                                         ========    ========
</TABLE>
 
  These amounts do not represent the actual credit or market exposure.
 
  Interest rate swaps are contractual agreements between counterparties to
exchange interest payment streams based on notional principal amounts over a
set period of time. Swap agreements normally involve the exchange of fixed and
floating rate payment obligations without the exchange of the underlying
principal amounts.
 
                                      64
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
  The Corporation enters into interest rate swaps to manage the interest rate
volatility associated with variable rate loans and brokered callable CDs at
the Corporation's affiliate banks. The Corporation also enters into interest
swaps in connection with trading activities to enable customers to manage
their interest rate risks. The Corporation's market risk from unfavorable
movements in interest rates associated with trading swaps is minimized by
concurrently entering into offsetting positions with nearly identical notional
values, terms and indexes. Interest rate swaps held for Trading consisted of
$35 million in notional amount of received fixed and $35 million in notional
amount of pay fixed at December 31, 1998. At December 31, 1998, the
Corporation's interest rate swap portfolio held for other than trading
consisted of the following ($ in millions):
 
 
<TABLE>
<CAPTION>
                                         Remaining Maturity in Years
                             ----------------------------------------------------
                                                                     Over
                                                                      5
   Other                     0-1 Yrs 1-2 Yrs 2-3 Yrs 3-4 Yrs 4-5 Yrs Yrs   Total
   -----                     ------- ------- ------- ------- ------- ----  ------
   <S>                       <C>     <C>     <C>     <C>     <C>     <C>   <C>
   Notional value..........   $210    $120    $171    $ 75    $194   $247  $1,017
   Weighted average receive
    rate...................   6.22%   6.13%   6.34%   5.38%   5.79%  6.09%   6.05%
   Weighted average pay
    rate (variable)........   5.29%   5.23%   5.25%   5.34%   5.24%  5.18%   5.24%
</TABLE>
 
  The impact on net interest income from interest rate swaps in 1998 and 1997
was a positive $5.21 million and $2.52 million, respectively.
 
  Interest caps and floors are contracts with notional principal amounts that
require the seller, in exchange for a fee, to make payments to the purchaser
if a specified market rate rises/falls above/below the fixed ceiling or floor
or index rate on specified future dates.
 
  The Corporation purchases standard interest rate caps and floors to manage
the interest volatility associated with variable rate loans and variable rate
borrowings. At December 31, 1998, the Corporation was party to one interest
rate floor contract and one interest rate cap contract which are summarized as
follows ($ in millions):
 
<TABLE>
<CAPTION>
                                                          Weighted-Average
                                                      ---------------------------
                                             Notional Strike          Remaining
      Type                                    Amount   Rate   Index  Term (years)
      ----                                   -------- ------  -----  ------------
      <S>                                    <C>      <C>     <C>    <C>
      Floor.................................  $25.0   5.250%  5.250%     2.98
      Cap...................................   25.0   6.000   5.313      0.76
</TABLE>
 
  No payments were received in 1998 and the effect of amortization of the fee
premiums were not material.
 
  The market risk due to potential fluctuations in interest rates is inherent
in swap, cap and floor agreements. Credit risk arises from the potential
failure of counterparties to perform in accordance with the terms of the
contracts. The Corporation maintains risk management policies that define
parameters of acceptable market risk within the framework of its overall
asset/liability management strategies and monitor and limit exposure to credit
risk. The Corporation believes its credit and settlement procedures serve to
minimize its exposure to credit risk. Credit exposure resulting from swaps,
caps and floors is represented by their fair value amounts, increased by an
estimate of potential adverse position exposure arising from changes over time
in interest rates, maturities and other relevant factors. At December 31, 1998
the estimated credit exposure arising from swaps, caps and floors was
approximately $19.4 million.
 
                                      65
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
18. Fair Value of Financial Instruments
 
  The book values and estimated fair values for on and off-balance sheet
financial instruments as of December 31, 1998 and 1997 are reflected below:
 
              Balance Sheet Financial Instruments ($ in millions)
 
<TABLE>
<CAPTION>
                                               1998                1997
                                        ------------------- -------------------
                                          Book      Fair      Book      Fair
                                          Value     Value     Value     Value
                                        --------- --------- --------- ---------
<S>                                     <C>       <C>       <C>       <C>
Financial Assets:
  Cash and short-term investments...... $   958.7 $   958.7 $   955.1 $   955.1
  Trading securities...................      34.0      34.0      43.6      43.6
  Investment securities available for
   sale................................   4,049.4   4,049.4   4,208.6   4,208.6
  Investment securities held to
   maturity............................   1,056.2   1,095.0   1,176.7   1,203.9
  Net loans............................  13,770.1  14,338.5  12,893.3  13,222.3
  Interest receivable..................     179.3     179.3     152.7     152.7
Financial Liabilities:
  Deposits.............................  15,919.9  16,061.5  15,020.3  15,105.1
  Short-term borrowings................   1,834.6   1,834.6   1,842.8   1,842.8
  Long-term borrowings.................   1,037.2   1,100.4   1,099.9   1,120.2
  Interest payable.....................      97.2      97.2      98.5      98.5
</TABLE>
 
  Where readily available, quoted market prices were utilized by the
Corporation. If quoted market prices were not available, fair values were
based on estimates using present value or other valuation techniques. These
techniques were significantly affected by the assumptions used, including the
discount rate and estimates of future cash flows. The calculated fair value
estimates, therefore, cannot be substantiated by comparison to independent
markets and, in many cases, could not be realized upon immediate settlement of
the instrument. SFAS 107 excludes certain financial instruments and all
nonfinancial assets and liabilities from its disclosure requirements.
Accordingly, the aggregate fair value amounts presented do not represent the
underlying value of the entire Corporation.
 
  The following methods and assumptions were used in estimating the fair value
for financial instruments.
 
 Cash and Short-term Investments
 
  The carrying amounts reported for cash and short-term investments
approximates the fair values for those assets.
 
 Trading and Investment Securities
 
  Fair value is based on quoted market prices or dealer quotes. See Note 6,
Securities, for additional information.
 
 Loans
 
  Loans that reprice or mature within three months of December 31 were
assigned fair values based on their book value. Market values were used on
performing loans where available. Most remaining loan balances were assigned
fair values based on a discounted cash flow analysis. The discount rate was
based on the treasury yield curve, with rate adjustments for credit quality,
cost and profit factors.
 
                                      66
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
 Deposits
 
  The fair value for demand deposits or any interest bearing deposits with no
fixed maturity date was considered to be equal to the carrying value. Time
deposits with defined maturity dates were considered to have a fair value
equal to the book value if the maturity date was within three months of
December 31. The remaining time deposits were assigned fair values based on a
discounted cash flow analysis using discount rates which approximate interest
rates currently being offered on time deposits with comparable maturities.
 
 Borrowings
 
  Short-term borrowings are carried at cost which approximates fair value.
Long-term debt was generally valued using a discounted cash flow analysis with
a discount rate based on current incremental borrowing rates for similar types
of arrangements or, if not readily available, based on a build up approach
similar to that used for loans and deposits. Long-term borrowings include
their related current maturities.
 
            Off-Balance Sheet Financial Instruments ($ in millions)
 
  Fair values of loan commitments and letters of credit have been estimated
based on the equivalent fees, net of expenses, that would be charged for
similar contracts and customers at December 31.
 
<TABLE>
<CAPTION>
                                                                       1998 1997
                                                                       ---- ----
      <S>                                                              <C>  <C>
      Loan commitments................................................ $1.3 $0.7
      Letters of credit...............................................  3.3  2.2
</TABLE>
 
  Foreign exchange contracts are carried at market value (U.S. dollar
equivalent of the underlying contract). The fair value of options
written/purchased are based on the market value as of the reporting date.
 
<TABLE>
<CAPTION>
                                                                   1998   1997
                                                                  ------ ------
      <S>                                                         <C>    <C>
      Commitments to purchase foreign exchange................... $506.2 $418.9
      Commitments to deliver foreign exchange....................  510.7  421.6
      Options written/purchased..................................    1.8    0.0
</TABLE>
 
  Interest rate swaps, caps and floors are assigned a value based on a
discounted cash flow analysis utilizing the forward yield curve.
 
<TABLE>
<CAPTION>
                                                                      1998  1997
                                                                      ----- ----
      <S>                                                             <C>   <C>
      Interest rate swaps............................................ $13.1 $4.2
      Interest rate floor............................................   0.4  0.2
      Interest rate cap..............................................   0.0  0.1
</TABLE>
 
  See Note 17 for additional information on off-balance sheet financial
instruments.
 
19. Business Segments
 
  Effective January 1, 1998, M&I adopted Statement of Financial Accounting
Standards No. 131, Disclosures about Segments of an Enterprise and Related
Information (SFAS 131). SFAS 131 superseded SFAS 14, Financial Reporting for
Segments of a Business Enterprise. SFAS 131 establishes standards for the way
that public business enterprises report information about operating segments
in annual financial statements and requires that those enterprises report
selected information about operating segments in interim financial reports.
SFAS 131 also establishes standards for related disclosures about products and
services, geographic areas and major customers. The adoption of SFAS 131 did
not affect results of operations or financial position, but did affect the
disclosure of segment information.
 
                                      67
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
  Generally, the Corporation organizes its segments based on legal entities
and segregates the Data Services Division of the Corporation. Each entity
offers a variety of products and services to meet the needs of its customers
and the particular market served. Each entity or division has its own
president and is separately managed subject to adherence to Corporate
policies. Discrete financial information is reviewed by senior management to
assess performance on a monthly basis. Certain segments are combined and
consolidated for purposes of assessing financial performance.
 
  The Corporation evaluates the profit or loss performance of its segments
based on operating income. Operating income is after-tax income excluding
nonrecurring charges and charges for services from the holding company,
excluding its Data Services Division. Operating income for the banking
entities and certain other entities also excludes certain assets, liabilities,
equity, revenues and expenses associated with adjustments, charges or credits
arising from acquisitions accounted for as purchases (hereinafter called
acquisition costs). The accounting policies of the Corporation's segments are
the same as those described in Note 1. Intersegment revenues may be based on
cost, current market prices or negotiated prices between the providers and
receivers of services.
 
  Based on the way the Corporation organizes its segments and the requirements
of SFAS 131 the Corporation has determined that it has two reportable
segments. Information with respect to M&I's segments is as follows ($ in
millions):
 
Banking
 
  Banking represents the aggregation of twenty-six separately chartered banks
located in Wisconsin, one bank in Arizona, one federally chartered thrift
headquartered in Illinois and an operational support subsidiary. Banking
consists of accepting deposits, making loans and providing other services such
as cash management, foreign exchange and correspondent banking to a variety of
commercial and retail customers. Products and services are provided through a
variety of delivery channels including traditional branches, supermarket
branches, telephone centers, ATMs and the internet. In addition, the
Corporation's larger affiliate banks provide numerous services such as cash
management, regional credit, and centralized accounting to M&I's community
banking affiliates. Intrasegment revenues, expenses and assets have been
eliminated in the following information.
 
<TABLE>
<CAPTION>
                                       1998       1997       1996
                                     ---------  ---------  ---------
      <S>                            <C>        <C>        <C>
      Revenue:
        Net interest income......... $   664.8  $   579.6  $   520.8
        Other revenues:
          Unaffiliated customers....     167.4      133.3      121.9
          Affiliated customers......      13.5        8.4        8.3
                                     ---------  ---------  ---------
            Total revenues..........     845.7      721.3      651.0
      Expenses:
        Intersegment charges........      91.1       77.5       69.7
        Other operating expense.....     297.6      278.8      274.5
                                     ---------  ---------  ---------
            Total expenses..........     388.7      356.3      344.2
      Provision for loan and lease
       losses.......................      26.1       16.7       15.3
      Income tax expense............     145.9      117.5       99.9
                                     ---------  ---------  ---------
      Operating income.............. $   285.0  $   230.8  $   191.6
                                     =========  =========  =========
      Identifiable assets........... $20,215.8  $19,270.1  $14,898.4
                                     =========  =========  =========
      Net purchases of premises and
       equipment.................... $    28.3  $    29.9  $    17.8
                                     =========  =========  =========
      Return on Tangible Equity.....      18.2%      18.9%      17.6%
                                     =========  =========  =========
</TABLE>
 
                                      68
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
  The following tables present revenue and operating income by line of
business for Banking. This information is based on the Corporation's product
profitability measurement system and is an aggregation of the revenues and
expenses associated with the products and services within each line of
business. Net interest income is derived from the Corporation's internal funds
transfer pricing system, expenses are allocated based on available transaction
volumes and the provision for loan and lease losses is allocated based on
credit risk. Equity is assigned to products and services on a basis that
considers market, operational and reputation risk. Information for 1996 is not
available ($ in millions) :
 
<TABLE>
<CAPTION>
                                         Commercial Retail   Investments  Total
      1998                                Banking   Banking   and Other  Banking
      ----                               ---------- -------  ----------- -------
      <S>                                <C>        <C>      <C>         <C>
      Revenue:
        Net interest income.............   $303.7   $289.4     $ 71.7    $664.8
        Other revenue...................     49.0     70.3       61.6     180.9
                                           ------   ------     ------    ------
          Total revenues................   $352.7   $359.7     $133.3    $845.7
                                           ======   ======     ======    ======
      Percent of Total..................     41.7%    42.5%      15.8%    100.0%
                                           ======   ======     ======    ======
      Operating Income..................   $148.5   $ 91.2     $ 45.3    $285.0
                                           ======   ======     ======    ======
      Percent of Total..................     52.1%    32.0%      15.9%    100.0%
                                           ======   ======     ======    ======
      Return on Tangible Equity.........     23.1%    20.1%                18.2%
                                           ======   ======               ======
 
<CAPTION>
      1997
      ----
      <S>                                <C>        <C>      <C>         <C>
      Revenue:
        Net interest income.............   $266.9   $254.5     $ 58.2    $579.6
        Other revenue...................     45.1     55.5       41.1     141.7
                                           ------   ------     ------    ------
          Total revenues................   $312.0   $310.0     $ 99.3    $721.3
                                           ======   ======     ======    ======
      Percent of Total..................     43.3%    43.0%      13.7%    100.0%
                                           ======   ======     ======    ======
      Operating Income..................   $132.7   $ 75.0     $ 23.1    $230.8
                                           ======   ======     ======    ======
      Percent of Total..................     57.5%    32.5%      10.0%    100.0%
                                           ======   ======     ======    ======
      Return on Tangible Equity.........     24.5%    20.4%                18.9%
                                           ======   ======               ======
</TABLE>
 
                                      69
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
Data Services
 
  Data Services includes the Data Services Division of the Corporation as well
as three nonbank subsidiaries. Data Services provides data processing
services, develops and sells software and provides consulting services to M&I
affiliates as well as banks, thrifts, credit unions, trust companies and other
financial services companies throughout the world although its activities are
primarily domestic. In addition, Data Services derives revenue from the
Corporation's credit card merchant operations. The majority of Data Services
revenue is derived from internal and external processing. Intrasegment
revenues, expenses and assets have been eliminated in the following
information.
 
<TABLE>
<CAPTION>
                                                      1998     1997     1996
                                                     -------  -------  -------
      <S>                                            <C>      <C>      <C>
      Revenue:
        Net interest expense.......................  $  (2.5) $  (2.8) $  (3.5)
        Other revenues:
          Unaffiliated customers...................    424.8    354.3    269.1
          Affiliated customers.....................     85.1     77.7     77.1
                                                     -------  -------  -------
            Total revenues.........................    507.4    429.2    342.7
      Expenses:
        Intersegment charges.......................      2.3      2.0      1.4
        Other operating expense....................    437.2    366.6    297.3
                                                     -------  -------  -------
            Total expenses.........................    439.5    368.6    298.7
      Income tax expense...........................     28.2     24.9     18.0
                                                     -------  -------  -------
      Operating income.............................  $  39.7  $  35.7  $  26.0
                                                     =======  =======  =======
      Identifiable assets..........................  $ 361.0  $ 327.3  $ 289.5
                                                     =======  =======  =======
      Net purchases of premises and equipment......  $  29.2  $  33.4  $  31.7
                                                     =======  =======  =======
      Return on Equity.............................     20.5%    21.8%    20.4%
                                                     =======  =======  =======
</TABLE>
 
                                      70
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
All Others
 
  M&I's primary other operating segments includes Trust Services, Mortgage
Banking (residential and commercial), Capital Markets Group, Brokerage and
Insurance Services and Commercial Leasing. Trust Services provide investment
management and advisory services as well as personal, commercial and corporate
trust services in Wisconsin, Florida and Arizona. Capital Markets Group
provide venture capital and advisory services. Intrasegment revenues, expenses
and assets for the entities that comprise Trust Services and Capital Markets
Group have been eliminated in the following information.
 
<TABLE>
<CAPTION>
                                                          1998    1997    1996
                                                         ------  ------  ------
      <S>                                                <C>     <C>     <C>
      Revenue:
        Net interest income............................. $ 34.6  $ 28.1  $ 22.7
        Other revenues:
          Unaffiliated customers........................  157.8   116.1   118.6
          Affiliated customers..........................   23.0    13.6     8.7
                                                         ------  ------  ------
            Total revenues..............................  215.4   157.8   150.0
      Expenses:
        Intersegment charges............................   28.3    20.5    19.0
        Other operating expense.........................  104.9    81.8    71.7
                                                         ------  ------  ------
            Total expenses..............................  133.2   102.3    90.7
      Provision for loan and lease losses...............    1.0     0.9     0.3
      Income tax expense................................   31.9    21.0    23.3
                                                         ------  ------  ------
      Operating income.................................. $ 49.3  $ 33.6  $ 35.7
                                                         ======  ======  ======
      Identifiable assets............................... $647.9  $592.2  $487.6
                                                         ======  ======  ======
      Net purchases of premises and equipment........... $  1.3  $  4.2  $  2.9
                                                         ======  ======  ======
      Return on Tangible Equity.........................   26.2%   20.1%   24.7%
                                                         ======  ======  ======
</TABLE>
 
  Total Revenues by type in All Others consist of the following:
 
<TABLE>
<CAPTION>
                                                             1998   1997   1996
                                                            ------ ------ ------
      <S>                                                   <C>    <C>    <C>
      Trust Services....................................... $ 90.4 $ 78.9 $ 70.6
      Residential Mortgage Banking.........................   48.6   28.3   23.7
      Capital Markets......................................   33.4   14.9   25.1
      Brokerage and Insurance..............................   18.1   15.0   11.3
      Commercial Leasing...................................   13.7   12.5   12.7
      Commercial Mortgage Banking..........................    7.3    4.7    3.5
      Others...............................................    3.9    3.5    3.1
                                                            ------ ------ ------
            Total.......................................... $215.4 $157.8 $150.0
                                                            ====== ====== ======
</TABLE>
 
                                      71
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
  Segment information reconciled to the Consolidated Financial Statements is as
follows ($ in millions):
 
<TABLE>
<CAPTION>
                              1998      1997      1996
                            --------  --------  --------
<S>                         <C>       <C>       <C>
Revenues:
  Banking.................  $  845.7  $  721.3  $  651.0
  Data Services...........     507.4     429.2     342.7
  All Others..............     215.4     157.8     150.0
  Corporate overhead......      (4.9)     (8.0)     (3.6)
  Acquisition costs.......     (10.2)      1.2       1.9
  Intersegment
   eliminations...........    (121.0)    (98.5)    (94.9)
                            --------  --------  --------
Consolidated revenues.....  $1,432.4  $1,203.0  $1,047.1
                            ========  ========  ========
Expenses:
  Banking.................  $  388.7  $  356.3  $  344.2
  Data Services...........     439.5     368.6     298.7
  All Others..............     133.2     102.3      90.7
  Corporate overhead......      49.5      57.6      44.6
  Acquisition costs.......      26.7      10.9       6.3
  Merger/restructuring....      23.4       --        --
  Purchased research and
   development............       --        --       12.1
  SAIF assessment.........       --        --        7.1
  Write-off intangibles...       --        --        4.7
  Intersegment
   eliminations...........    (121.0)    (98.5)    (94.9)
                            ========  ========  ========
Consolidated expenses.....  $  940.0  $  797.2  $  713.5
                            ========  ========  ========
Provision for loan and
 lease losses:
  Banking.................  $   26.1  $   16.7  $   15.3
  All Others..............       1.0       0.9       0.3
                            --------  --------  --------
Consolidated provision for
 loan and lease losses....  $   27.1  $   17.6  $   15.6
                            ========  ========  ========
Income tax expense
 (benefit):
  Banking.................  $  145.9  $  117.5  $   99.9
  Data Services...........      28.2      24.9      18.0
  All Others..............      31.9      21.0      23.3
  Corporate overhead......     (24.9)    (29.7)    (20.0)
  Acquisition costs.......     (10.0)     (2.2)     (1.2)
  Merger/restructuring....      (7.1)      --        --
  Purchased research and
   development............       --        --       (4.2)
  SAIF assessment.........       --        --       (2.7)
  Write-off intangibles...       --        --       (1.8)
                            --------  --------  --------
Consolidated income tax
 expense..................  $  164.0  $  131.5  $  111.3
                            ========  ========  ========
</TABLE>
 
                                       72
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
<TABLE>
<CAPTION>
                                                  1998       1997       1996
                                                ---------  ---------  ---------
<S>                                             <C>        <C>        <C>
Net income (loss):
  Operating income:
    Banking.................................... $   285.0  $   230.8  $   191.6
    Data Services..............................      39.7       35.7       26.0
    All Others.................................      49.3       33.6       35.7
  Corporate overhead...........................     (29.5)     (35.9)     (28.2)
  Acquisition costs............................     (26.9)      (7.5)      (3.2)
  Merger/restructuring.........................     (16.3)       --         --
  Purchased research and development...........       --         --        (7.9)
  SAIF assessment..............................       --         --        (4.4)
  Write-off intangibles........................       --         --        (3.0)
                                                ---------  ---------  ---------
Consolidated net income........................ $   301.3  $   256.7  $   206.6
                                                =========  =========  =========
Assets:
  Banking...................................... $20,215.8  $19,270.1  $14,898.4
  Data Services................................     361.0      327.3      289.5
  All Others...................................     647.9      592.2      487.6
  Corporate overhead...........................     196.6      160.5      217.0
  Acquisition costs............................     290.7      303.8       41.0
  Intersegment eliminations....................    (145.7)    (151.7)    (137.6)
                                                ---------  ---------  ---------
Consolidated assets............................ $21,566.3  $20,502.2  $15,795.9
                                                =========  =========  =========
Depreciation and amortization:
  Banking...................................... $    19.1  $    12.2  $    22.4
  Data Services................................      67.6       62.2       50.2
  All Others...................................     (15.6)     (23.8)     (24.0)
  Corporate overhead...........................       3.2        3.7        2.9
  Acquisition costs............................      37.1        9.6        4.6
                                                ---------  ---------  ---------
Consolidated depreciation and amortization..... $   111.4  $    63.9  $    56.1
                                                =========  =========  =========
Purchases of premises and equipment, net:
  Banking...................................... $    28.3  $    29.9  $    17.8
  Data Services................................      29.2       33.4       31.7
  All Others...................................       1.3        4.2        2.9
  Corporate overhead...........................       2.0        1.3        1.0
                                                ---------  ---------  ---------
Consolidated purchases of premises
 and equipment, net............................ $    60.8  $    68.8  $    53.4
                                                =========  =========  =========
</TABLE>
 
                                       73
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
20. Condensed Financial Information--Parent Corporation Only
 
                           Condensed Balance Sheets
                                  December 31
 
<TABLE>
<CAPTION>
                                                             1998       1997
                                                          ---------- ----------
<S>                                                       <C>        <C>
Assets
Cash and cash equivalents................................ $   77,036 $   64,275
Data processing services receivables.....................    101,826     88,969
Indebtedness of nonbank affiliates.......................    330,152    275,786
Investments in affiliates:
  Banks..................................................  1,825,131  1,793,153
  Nonbanks...............................................    261,317    233,048
Premises and equipment, net..............................    125,345    124,502
Other assets.............................................    204,339    165,459
                                                          ---------- ----------
    Total assets......................................... $2,925,146 $2,745,192
                                                          ========== ==========
Liabilities and Shareholders' Equity
Commercial paper issued.................................. $   60,162 $  109,586
Other liabilities........................................    201,249    188,981
Long-term borrowings:
  7.65% Junior Subordinated Deferrable Interest
   Debentures due to M&I Capital Trust A.................    205,282    205,249
  Other..................................................    214,674    218,947
                                                          ---------- ----------
    Total Long-term borrowings...........................    419,956    424,196
                                                          ---------- ----------
    Total liabilities....................................    681,367    722,763
Shareholders' equity.....................................  2,243,779  2,022,429
                                                          ---------- ----------
    Total liabilities and shareholders' equity........... $2,925,146 $2,745,192
                                                          ========== ==========
</TABLE>
 
  Scheduled maturities of long-term borrowings are $32,497 in 1999, $24,328 in
2000, $33,469 in 2001, $24,616 in 2002, and $100,111 in 2003. See Note 12 for
a description of the junior subordinated debt due to M&I Capital Trust A.
 
                                      74
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
                         Condensed Statements of Income
                            Years Ended December 31
 
<TABLE>
<CAPTION>
                                                     1998      1997      1996
                                                   --------  --------  --------
<S>                                                <C>       <C>       <C>
Income
Cash dividends:
  Bank affiliates................................  $186,149  $255,670  $225,425
  Nonbank affiliates.............................    67,114    37,034    11,687
Interest from affiliates.........................    19,061    16,846    13,560
Data processing income...........................   476,543   406,594   335,127
Service fees and other...........................    64,406    52,983    38,215
                                                   --------  --------  --------
    Total income.................................   813,273   769,127   624,014
Expense
Interest.........................................    32,979    33,416    23,016
Salaries and employee benefits...................   270,704   237,647   180,574
Administrative and general.......................   213,596   171,039   151,939
                                                   --------  --------  --------
    Total expense................................   517,279   442,102   355,529
Income before income taxes and equity in
 undistributed net income of affiliates..........   295,994   327,025   268,485
Provisions for income taxes......................    17,034    10,864    11,669
                                                   --------  --------  --------
Income before equity in undistributed net income
 of affiliates...................................   278,960   316,161   256,816
Equity in undistributed net income of affiliates,
 net of dividends paid:
  Banks..........................................    44,611   (54,404)  (64,352)
  Nonbanks.......................................   (22,248)   (5,072)   14,171
                                                   --------  --------  --------
    Net income...................................  $301,323  $256,685  $206,635
                                                   ========  ========  ========
</TABLE>
 
                                       75
<PAGE>
 
            Notes to Consolidated Financial Statements--(Continued)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
 
                       Condensed Statements of Cash Flows
                            Years Ended December 31
 
<TABLE>
<CAPTION>
                                                   1998       1997      1996
                                                ----------  --------  --------
<S>                                             <C>         <C>       <C>
Cash Flows From Operating Activities
Net income..................................... $  301,323  $256,685  $206,635
Noncash items included in income:
  Equity in undistributed net income of
   affiliates..................................    (22,363)   59,476    50,181
  Depreciation and amortization................     68,059    62,996    51,515
  Merger/Restructuring.........................     11,615       --        --
  Other........................................    (56,698)   (2,456)   14,761
                                                ----------  --------  --------
Net cash provided by operating activities......    301,936   376,701   323,092
Cash Flows From Investing Activities
  Increases in indebtedness of affiliates...... (1,463,424) (822,662) (140,684)
  Decreases in indebtedness of affiliates......  1,409,058   730,926   135,324
  Increases in investments in affiliates.......     (5,434)      (24)  (27,756)
  Net capital expenditures.....................    (30,850)  (22,049)  (44,292)
  Acquisitions accounted for as purchases, net
   of cash equivalents acquired................     (5,170) (259,462)      --
  Purchase of Bank-Owned Life Insurance........    (32,625)      --        --
  Other........................................     14,420    17,575   (73,837)
                                                ----------  --------  --------
Net cash used in investing activities..........   (114,025) (355,696) (151,245)
Cash Flows From Financing Activities
  Dividends paid...............................    (97,241)  (79,272)  (70,966)
  Proceeds from issuance of commercial paper...    779,653   455,726   641,754
  Principal payments on commercial paper.......   (829,077) (360,374) (669,091)
  Proceeds from issuance of long-term debt.....        --    101,131   197,628
  Payments on long-term debt...................    (13,913) (114,414)  (72,417)
  Purchase of common stock.....................    (29,633)  (64,430) (180,053)
  Proceeds from exercise of stock options......     15,086    23,538    13,305
  Other........................................        (25)      960       632
                                                ----------  --------  --------
Net cash used in financing activities..........   (175,150)  (37,135) (139,208)
                                                ----------  --------  --------
Net increase (decrease) in cash and cash
 equivalents...................................     12,761   (16,130)   32,639
Cash and cash equivalents, beginning of year...     64,275    80,405    47,766
                                                ----------  --------  --------
Cash and cash equivalents, end of year......... $   77,036  $ 64,275  $ 80,405
                                                ==========  ========  ========
</TABLE>
 
                                       76
<PAGE>
 
                  Quarterly Financial Information (Unaudited)
 
          December 31, 1998, 1997 and 1996 ($000's except share data)
 
  Following is unaudited financial information for each of the calendar
quarters during the years ended December 31, 1998 and 1997.
 
<TABLE>
<CAPTION>
                           Quarter Ended
                -----------------------------------
                Dec. 31  Sept. 30 June 30  March 31
                -------- -------- -------- --------
<S>     <C>     <C>      <C>      <C>      <C>
1998
Total Interest
 Income........ $358,701 $362,509 $358,747 $354,087
Net Interest
 Income........  173,989  169,467  168,013  164,601
Provision for
 Loan Losses...   12,588    4,769    4,868    4,865
Income before
 Income Taxes..  128,153  122,613   96,645  117,874
Net Income.....   83,470   80,155   62,192   75,506
Net Income Per
 Share:*
  Basic........ $   0.77 $   0.74 $   0.57 $   0.70
  Diluted......     0.72     0.70     0.54     0.66
1997
Total Interest
 Income........ $363,257 $294,020 $286,402 $276,654
Net Interest
 Income........  173,398  143,284  140,884  136,981
Provision for
 Loan Losses...    4,478    4,348    4,396    4,411
Income before
 Income Taxes..  114,950   97,877   89,266   86,079
Net Income.....   75,165   64,780   59,404   57,336
Net Income Per
 Share:*
  Basic........ $   0.70 $   0.68 $   0.63 $   0.61
  Diluted......     0.65     0.63     0.58     0.56
 
</TABLE>
 
<TABLE>
<CAPTION>
                                                1998   1997   1996   1995  1994
                                                ----- ------ ------ ------ -----
<S>                                             <C>   <C>    <C>    <C>    <C>
Common Dividends Declared
First Quarter.................................. $0.20 $0.185 $0.165 $0.150 $0.14
Second Quarter.................................  0.22  0.200  0.185  0.165  0.15
Third Quarter..................................  0.22  0.200  0.185  0.165  0.15
Fourth Quarter.................................  0.22  0.200  0.185  0.165  0.15
                                                ----- ------ ------ ------ -----
                                                $0.86 $0.785 $0.720 $0.645 $0.59
                                                ===== ====== ====== ====== =====
</TABLE>
- --------
*  May not add due to rounding
 
                             Price Range of Stock
                             (Low and High Close)
 
<TABLE>
<CAPTION>
                                        1998     1997    1996    1995     1994
                                      -------- -------- ------- ------- --------
<S>                                   <C>      <C>      <C>     <C>     <C>
First Quarter
  Low................................ $53 1/4  $32 3/4  $24 5/8 $18 1/8 $20
  High...............................  59 1/2   40 1/4   26 1/4  21 3/4  23 3/4
Second Quarter
  Low................................  50 7/16  35 1/16  24 7/8  19 7/8  19 1/4
  High...............................  61 5/8   42 1/2   28 1/8  22 3/4  22 1/4
Third Quarter
  Low................................  44       40 7/8   25 1/2  22 1/8  19 5/8
  High...............................  59       52 5/8   30 1/8  26 1/4  21 3/4
Fourth Quarter
  Low................................  40 1/2   50 1/16  30      24      18
  High...............................  58 7/16  62 1/8   35 3/8  26 3/8  20 9/16
</TABLE>
 
                                      77
<PAGE>
 
                   REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
To the Shareholders and the Board of Directors of Marshall & Ilsley
Corporation:
 
  We have audited the accompanying consolidated balance sheets of Marshall &
Ilsley Corporation (a Wisconsin corporation) and subsidiaries as of December
31, 1998 and 1997, and the related consolidated statements of income,
shareholders' equity and cash flows for the years ended December 31, 1998,
1997 and 1996. These consolidated financial statements are the responsibility
of the Corporation's management. Our responsibility is to express an opinion
on these consolidated financial statements based on our audits.
 
  We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to
obtain reasonable assurance about whether the consolidated financial
statements are free of material misstatement. An audit includes examining, on
a test basis, evidence supporting the amounts and disclosures in the
consolidated financial statements. An audit also includes assessing the
accounting principles used and significant estimates made by management, as
well as evaluating the overall financial statement presentation. We believe
that our audits provide a reasonable basis for our opinion.
 
  In our opinion, the consolidated financial statements referred to above
present fairly, in all material respects, the financial position of Marshall &
Ilsley Corporation and subsidiaries as of December 31, 1998 and 1997, and the
results of their operations and their cash flows for the years ended December
31, 1998, 1997 and 1996, in conformity with generally accepted accounting
principles.
 
                                          /s/ Arthur Andersen LLP
 
Milwaukee, Wisconsin,
January 29, 1999
 
                                      78
<PAGE>
 
ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
FINANCIAL DISCLOSURE
 
  Not applicable.
 
                                   PART III
 
ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT
 
  Incorporated herein by reference to M&I's definitive proxy statement for the
Annual Meeting of Shareholders to be held on April 27, 1999, except for
information as to executive officers which is set forth in Part I of this
report.
 
ITEM 11. EXECUTIVE COMPENSATION
 
  Incorporated herein by reference to M&I's definitive proxy statement for the
Annual Meeting of Shareholders to be held on April 27, 1999.
 
ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT
 
  Incorporated herein by reference to M&I's definitive proxy statement for the
Annual Meeting of Shareholders to be held on April 27, 1999.
 
ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS
 
  Incorporated herein by reference to M&I's definitive proxy statement for the
Annual Meeting of Shareholders to be held on April 27, 1999.
 
                                    PART IV
 
ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K
 
  (a)1. Financial Statements
 
      Consolidated Financial Statements:
              Balance Sheets--December 31, 1998 and 1997
              Statements of Income--years ended December 31, 1998, 1997, and
              1996
              Statements of Cash Flows--years ended December 31, 1998, 1997,
              and 1996
              Statements of Shareholders' Equity--years ended December 31,
              1998, 1997 and 1996
              Notes to Consolidated Financial Statements
              Report of Independent Public Accountants
 
    2. Financial Statement Schedules
 
      All schedules are omitted because they are not required, not
      applicable or the required information is contained elsewhere.
 
    3. Exhibits
 
      See Index to Exhibits of this Form 10-K which is incorporated herein
      by reference.
 
  (b)Reports on Form 8-K
 
        Not applicable.
<PAGE>
 
                                  SIGNATURES
 
  Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed
on its behalf by the undersigned, thereunto duly authorized.
 
                                          MARSHALL & ILSLEY CORPORATION
 
                                                  /s/  J. B. Wigdale
                                          By: _________________________________
                                                       J. B. Wigdale
                                                   Chairman of the Board
 
                                          Date: March 1, 1999
 
  Pursuant to the requirements of the Securities Exchange Act of 1934, this
report has been signed below by the following persons on behalf of the
registrant and in the capacities and on the dates indicated:
 
        /s/ J. B. Wigdale              Chairman of the         Date: March 1,
- -------------------------------------   Board and a                 1999
            J. B. Wigdale               Director (Chief
                                        Executive
                                        Officer)
 
     /s/ G. H. Gunnlaugsson            Executive Vice          Date: March 1,
- -------------------------------------   President and a             1999
         G. H. Gunnlaugsson             Director (Chief
                                        Financial
                                        Officer)
 
      /s/ P. R. Justiliano             Senior Vice             Date: March 1,
- -------------------------------------   President and               1999
          P. R. Justiliano              Corporate
                                        Controller
                                        (Principal
                                        Accounting
                                        Officer)
 
 
Directors: Richard A. Abdoo, Oscar C. Boldt, Wendell F. Bueche, Jon F. Chait,
           Glenn A. Francke, G. H. Gunnlaugsson, Burleigh E. Jacobs, D.J.
           Kuester, Katharine C. Lyall, Edward L. Meyer, Jr., Don R. O'Hare,
           San W. Orr, Jr., Peter M. Platten, III, J.A. Puelicher, Robert A.
           Schaefer, Stuart W. Tisdale, J. B. Wigdale, James O. Wright and Gus
           A. Zuehlke.
 
 
        /s/ M. A. Hatfield
By___________________________________                       Date: March 1, 1999
            M. A. Hatfield
         As Attorney-in-Fact*
 
- --------
*Pursuant to authority granted by powers of attorney, copies of which are
filed herewith.
 
                                      80
<PAGE>
 
                         MARSHALL & ILSLEY CORPORATION
                                        
                               INDEX TO EXHIBITS
                                 (Item 14(a)3)

                                      ITEM
                                      ----
                                        
(3)  (a)  Restated Articles of Incorporation, incorporated by reference to M&I's
          Quarterly Report on Form 10-Q for the quarter ended June 30, 1994, SEC
          File No. 0-1220

     (b)  By-laws, as amended, incorporated by reference to M&I's Annual Report
          on Form 10-K for the year ended December 31, 1995, SEC File No. 0-1220

(4)  (a)  Indenture between M&I and Chemical Bank (as successor to Manufacturers
          Hanover Trust Company) dated as of November 15, 1985 ("Senior
          Indenture"), incorporated by reference to M&I's Registration Statement
          on Form S-3 (Registration No. 33-21377), as supplemented by the First
          Supplemental Indenture to the Senior Indenture dated as of May 31,
          1990, incorporated by reference to M&I's Current Report on Form 8-K
          dated May 31, 1990, and as supplemented by the Second Supplemental
          Indenture to the Senior Indenture dated as of July 15, 1993,
          incorporated by reference to M&I's Quarterly Report on Form 10-Q for
          the quarter ended June 30, 1993, SEC File No. 0-1220

     (b)  Form of Medium Term Notes, Series C, and Series D issued pursuant to
          the Senior Indenture, included in Exhibit 4(a)

     (c)  Indenture between M&I and Chemical Bank dated as of July 15, 1993
          ("Subordinated Indenture"), incorporated by reference to M&I's
          Quarterly Report on Form 10-Q for the quarter ended June 30, 1993, SEC
          File No. 0-1220

     (d)  Form of Subordinated Note issued pursuant to the Subordinated
          Indenture, included in Exhibit 4(c)

     (e)  Investment Agreement between M&I and The Northwestern Mutual Life
          Insurance Company dated August 30, 1985, incorporated by reference to
          M&I's Current Report on Form 8-K dated May 20, 1985, SEC File No. 0-
          1220

     (f)  Designation of Rights and Preferences of holders of Series A Preferred
          Stock, incorporated by reference to M&I's Current Report on Form 8-K
          dated May 20, 1985, SEC File No. 0-1220

     (g)  Amended and Restated Declaration of Trust dated as of December 9, 1996
          among Marshall & Ilsley Corporation, as Sponsor, The Chase Manhattan
          Bank, as Institutional Trustee, Chase Manhattan Bank Delaware, as
          Delaware Trustee, the Regular Trustees identified thereon, and the
          holders from time to time of undivided interests in the assets of the
          Trust, incorporated by reference to M&I's Registration Statement on
          Form S-4 dated January 15, 1997, SEC Reg. No. 333-19809

     (h)  Indenture, dated as of December 9, 1996, between Marshall & Ilsley
          Corporation and The Chase Manhattan Bank, as Indenture Trustee,
          incorporated by reference to M&I's Registration Statement on Form S-4
          dated January 15, 1997, SEC Reg. No. 333-19809
<PAGE>
 
     (i)  First Supplemental Indenture, dated as of December 9, 1996, between
          Marshall & Ilsley Corporation and The Chase Manhattan Bank, as
          Indenture Trustee, incorporated by reference to M&I's Registration
          Statement on Form S-4 dated January 15, 1997, SEC Reg. No. 333-19809

     (j)  Form of Capital Security Certificate for M&I Capital Trust A, included
          as Exhibit A-2 to Exhibit 4(h)

     (k)  Capital Securities Guarantee Agreement, dated as of December 9, 1996,
          between Marshall & Ilsley Corporation and The Chase Manhattan Bank, as
          Guarantee Trustee, incorporated by reference to M&I's Registration
          Statement on Form S-4 dated January 15, 1997, SEC Reg. No. 333-19809

     (l)  Registration Rights Agreement dated December 2, 1996, by and among
          Marshall & Ilsley Corporation, M&I Capital Trust A and Salomon
          Brothers Inc, as Representative of the Initial Purchasers,
          incorporated by reference to M&I's Registration Statement on Form S-4
          dated January 15, 1997, SEC Reg. No. 333-19809

     (m)  Form of Subordinated Debt Security, included as part of Exhibit 4(j)

(10) (a)  1983 Executive Stock Option and Restricted Stock Plan, as amended,
          incorporated by reference to M&I's Annual Report on Form 10-K for the
          fiscal year ended December 31, 1987, SEC File No. 0-1220*

     (b)  1985 Executive Stock Option and Restricted Stock Plan, as amended,
          incorporated by reference to M&I's Annual Report on Form 10-K for the
          fiscal year ended December 31, 1987, SEC File No. 0-1220*

     (c)  M&I Marshall & Ilsley Bank Supplementary Retirement Benefits Plan,
          incorporated by reference to M&I's Annual Report on Form 10-K for the
          fiscal year ended December 31, 1983, SEC File No. 0-1220*

     (d)  Consulting Agreement and Supplemental Retirement Plan dated as of
          October 1, 1986 between M&I and Mr. J.A. Puelicher, incorporated by
          reference to M&I's Annual Report on Form 10-K for the fiscal year
          ended December 31, 1986, SEC File No. 0-1220*

     (e)  Amendment to Consulting Agreement and Supplemental Retirement Plan
          dated as of August 13, 1992, between M&I and Mr. J.A. Puelicher,
          incorporated by reference to M&I's Annual Report on Form 10-K for the
          fiscal year ended December 31, 1993, SEC File No. 0-1220*

     (f)  Deferred Compensation Trust between Marshall & Ilsley Corporation and
          Bessemer Trust Company dated April 28, 1987, as amended, incorporated
          by reference to M&I's Annual Report on Form 10-K for the fiscal year
          ended December 31, 1988, SEC File No. 0-1220*

     (g)  1986 Non-Qualified Stock Option Plan of M&I and related Stock Option
          Agreement between M&I and Mr. J.A. Puelicher, incorporated by
          reference to M&I's Annual Report on Form 10-K for the fiscal year
          ended December 31, 1986, SEC File No. 0-1220*

     (h)  Form of employment agreements, dated November 5, 1990, between M&I and
          Messrs. Gunnlaugsson, Kuester, Strelow and Wigdale incorporated by
          reference to M&I's Annual Report on Form 10-K for the fiscal year
          ended December 31, 1990, SEC File No. 0-1220*

     (i)  Employment agreement, dated November 5, 1990, between M&I and Mr.
          Michael A. Hatfield incorporated by reference to M&I's Annual Report
          on Form 10-K for the fiscal year ended December 31, 1990, SEC File No.
          0-1220*

                                       2
<PAGE>
 
     (j)  Restricted Stock Plan of Marshall & Ilsley Corporation, incorporated
          by reference to M&I's Annual Report on Form 10-K for the fiscal year
          ended December 31, 1988, SEC File No. 0-1220*

     (k)  1989 Executive Stock Option and Restricted Stock Plan, incorporated by
          reference to M&I's Annual Report on Form 10-K for the fiscal year
          ended December 31, 1988, as amended by M&I's Annual Report on Form 10-
          K for the fiscal year ended December 31, 1990, SEC File No. 0-1220*

     (l)  Marshall & Ilsley Corporation Nonqualified Retirement Benefit Plan,
          incorporated by reference to M&I's Annual Report on Form 10-K for the
          fiscal year ended December 31, 1991, SEC File No. 0-1220*

     (m)  Marshall & Ilsley Corporation Supplemental Retirement Benefits Plan,
          incorporated by reference to M&I's Annual Report on Form 10-K for the
          fiscal year ended December 31, 1991, SEC File No. 0-1220*

     (n)  Marshall & Ilsley Trust Company Supplemental Retirement Benefits Plan,
          incorporated by reference to M&I's Annual Report on Form 10-K for the
          fiscal year ended December 31, 1991, SEC File No. 0-1220*

     (o)  Supplemental Retirement Agreement dated December 10, 1992, between M&I
          and Mr. J.A. Puelicher, incorporated by reference to M&I's Annual
          Report on Form 10-K for the fiscal year ended December 31, 1992, SEC
          File No. 0-1220*

     (p)  Amendment to Supplemental Retirement Agreement dated December 16,
          1993, between M&I and Mr. J.A. Puelicher, incorporated by reference to
          M&I's Annual Report on Form 10-K for the fiscal year ended December
          31, 1993, SEC File No. 0-1220*

     (q)  Marshall & Ilsley Corporation 1993 Executive Stock Option Plan, as
          amended, incorporated by reference to M&I's Annual Report on Form 10-K
          for the fiscal year ended December 31, 1995, SEC File No. 0-1220.*

     (r)  Marshall & Ilsley Corporation 1995 Directors Stock Option Plan,
          incorporated by reference to M&I's Proxy Statement for the 1995 Annual
          Meeting of Shareholders, SEC File No. 0-1220*

     (s)  Marshall & Ilsley Corporation Assumption Agreement dated May 31, 1994
          assuming rights, obligations and interests of Valley Bancorporation
          under various stock option plans, incorporated by reference to M&I's
          Registration Statement on Form S-8 (Reg. No. 33-53897)*

     (t)  Valley Bancorporation 1992 Outside Directors' Stock Option Plan,
          incorporated by reference to the Valley 1992 Proxy Statement*

     (u)  Employment agreement between M&I and Mr. Peter M. Platten, III,
          incorporated by reference to M&I's Registration Statement on Form S-4
          (Reg. No. 33-51753)*

     (v)  Letter agreement dated January 25, 1994 between Valley Bancorporation
          and Mr. Peter M. Platten, III incorporated by reference to M&I's
          Annual Report on Form 10-K for the fiscal year ended December 31,
          1994, SEC File No. 0-1220*

     (w)  Employment agreement, dated as of December 14, 1995, between M&I and
          Ms. Patricia R. Justiliano incorporated by reference to M&I's Annual
          Report on Form 10-K for the fiscal year ended December 31, 1995, SEC
          File No. 0-1220*

                                       3
<PAGE>
 
     (x)  Marshall & Ilsley Corporation 1997 Executive Stock Option and
          Restricted Stock Plan, incorporated by reference to M&I's Proxy
          Statement for the 1997 Annual Meeting of Shareholders*

     (y)  Marshall & Ilsley Corporation Executive Deferred Compensation Plan,
          incorporated by reference to M&I's Annual Report on Form 10-K for the
          fiscal year ended December 31, 1996, SEC File No. 0-1220*

     (z)  Deferred Compensation Trust II between Marshall & Ilsley Corporation
          and Marshall & Ilsley Trust Company, incorporated by reference to
          M&I's Annual Report on Form 10-K for the fiscal year ended December
          31, 1996, SEC File No. 0-1220*

     (aa) Marshall & Ilsley Corporation Annual Executive Incentive Compensation
          Plan, incorporated by reference to M&I's Proxy Statement for the 1997
          Annual Meeting of Shareholders*

     (bb) Marshall & Ilsley Corporation Amended and Restated Supplementary
          Retirement Benefits Plan, incorporated by reference to M&I's Annual
          Report on Form 10-K for the fiscal year ended December 31, 1996, SEC
          File No. 0-1220*

     (cc) Security Capital Corporation 1993 Incentive Stock Option Plan,
          incorporated by reference to M&I's Registration Statement on Form S-8
          (Reg. No. 333-36909)*

     (dd) Security Bank S.S.B. Deferred Compensation Plans for Key Executive
          Officers and Directors, incorporated by reference to Security Capital
          Corporation's Registration Statement on Form S-1 (Reg. No. 33-68982)*

     (ee) Security Bank S.S.B. Supplemental Pension Plan, incorporated by
          reference to Security Capital Corporation's Registration Statement on
          Form S-1 (Reg. No. 33-68982)*

     (ff) Directors Deferred Compensation Plan, incorporated by reference to
          M&I's Proxy Statement for the 1998 Annual Meeting of Shareholders*

     (gg) Marshall & Ilsley Corporation 1994 Long-Term Incentive Plan for
          Executives, as amended, incorporated by reference to M&I's Annual
          Report on Form 10-K for the fiscal year ended December 31, 1997, SEC
          File No. 0-1220*

     (hh) Amendment to Consulting Agreement and Supplemental Retirement Plan
          dated as of December 11, 1997, between M&I and Mr. J.A. Puelicher,
          incorporated by reference to M&I's Annual Report on Form 10-K for the
          fiscal year ended December 31, 1997, SEC File No. 0-1220*

     (ii) Employment agreement, dated December 11, 1997, between M&I and Mr.
          Delgadillo, incorporated by reference to M&I's Annual Report on Form
          10-K for the fiscal year ended December 31, 1997, SEC File No. 0-1220*

     (jj) Employment agreement, dated November 5, 1990, between M&I and Mr. D.R.
          Jones, incorporated by reference to M&I's Annual Report on Form 10-K
          for the fiscal year ended December 31, 1997, SEC File No. 0-1220*

     (kk) Amendment to Employment Agreement dated April 3, 1995, between M&I and
          Mr. D.R. Jones, incorporated by reference to M&I's Annual Report on
          Form 10-K for the fiscal year ended December 31, 1997, SEC File No. 0-
          1220*

     (ll) Employment agreement, dated June 12, 1997, between M&I and Mr. T.M.
          Bolger, incorporated by reference to M&I's Annual Report on Form 10-K
          for the fiscal year ended December 31, 1997, SEC File No. 0-1220*

                                       4
<PAGE>
 
     (mm) Employment agreement, dated October 16, 1997, between M&I and Mr. D.H.
          Wilson, incorporated by reference to M&I's Annual Report on Form 10-K
          for the fiscal year ended December 31, 1997, SEC File No. 0-1220*

     (nn) Employment agreement, dated January 12, 1999, between M&I and Mr. T.M.
          Bolger*

     (oo) Form of Employment agreements between M&I and Messrs. O'Neill and
          Williams*

(11) Computation of Net Income Per Common Share, incorporated by reference to
     Note 2 of Notes to Consolidated Financial Statements included in Item 8,
     Consolidated Financial Statements.

(12) Computation of Ratio of Earnings to Fixed Charges

(21) Subsidiaries

(23) Consent of Arthur Andersen LLP

(24) Powers of Attorney

(27) Financial Data Schedule

M&I will provide a copy of any instrument defining the rights of holders of
long-term debt to the Commission upon request.
_____________

* Management contract or compensatory plan or arrangement.

                                       5

<PAGE>
 
                                                                  Exhibit 10(nn)

                              EMPLOYMENT AGREEMENT
                            DATED JANUARY 12, 1999,
                        BETWEEN M&I AND MR. T.M. BOLGER


<PAGE>
 
                              EMPLOYMENT AGREEMENT
                              --------------------
                                        

     THIS AGREEMENT, entered into as of the 12th day of January, 1999, by and
between MARSHALL & ILSLEY CORPORATION (the "Company"), and THOMAS M. BOLGER (the
"Executive") (hereinafter collectively referred to as "the parties").

                             W I T N E S S E T H :

     WHEREAS, the Board of Directors of the Company (the "Board") recognizes
that the possibility of a Change of Control (as hereinafter defined in Section
2) exists and that the threat of or the occurrence of a Change of Control can
result in significant distractions of its key management personnel because of
the uncertainties inherent in such a situation; and

     WHEREAS, the Board has determined that it is essential and in the best
interest of the Company and its shareholders to retain the services of the
Executive in the event of a threat or occurrence of a Change of Control and to
ensure his continued dedication and efforts in such event without undue concern
for his personal financial and employment security; and

     WHEREAS, in order to induce the Executive to remain in the employ of the
Company, particularly in the event of a threat of or the occurrence of a Change
of Control, the Company desires to enter into this Agreement with the Executive.

     NOW, THEREFORE, in consideration of the respective agreements of the
parties contained herein, it is agreed as follows:

     1.  Employment Term.  (a) The "Employment Terms shall commence on the first
date during the Protected Period (as defined in Section 1(c), below) on which a
Change of Control (as defined in Section 2, below) occurs (the "Effective Date")
and shall expire on the third anniversary of the Effective Date; provided,
however, that at the end of each day of the Employment Term the Employment Term
shall automatically be extended for one (1) day unless either the Company or the
Executive shall have given written notice to the other at least thirty (30) days
prior thereto that the Employment Term shall not be so extended; and provided,
further, that the Employment Term shall not be automatically extended beyond the
first day of the month following the month in which the Executive attains age
sixty-five (65).

     (b)  Notwithstanding anything contained in this Agreement to the contrary,
if the Executive's employment is terminated prior to the Effective Date and the
Executive reasonably demonstrates that such termination (i) was at the request
of a third party who has indicated an intention or taken steps reasonably
calculated to effect a Change of Control, or (ii) otherwise occurred in
connection with or in anticipation of a Change of Control, then for all purposes
of this Agreement, the Effective Date shall mean the date immediately prior to
the date of such termination of the Executive's employment.

<PAGE>
 
     (c) For purposes of this Agreement, the "Protected Period" shall be the
three (3) year period commencing on the date hereof, provided, however, that at
the end of each day the Protected Period shall be automatically extended for one
(1) day unless at least thirty (30) days prior thereto the Company shall have
given written notice to the Executive that the Protected Period shall not be so
extended; and provided, further, that notwithstanding any such notice by the
Company not to extend, the Protected Period shall not end if prior to the
expiration thereof any third party has indicated an intention or taken steps
reasonably calculated to effect a Change of Control, in which event the
Protected Period shall end only after such third party publicly announces that
it has abandoned all efforts to effect a Change of Control.

     2.  Change of Control.  For purposes of this Agreement, a "Change of
Control" shall mean the first to occur of the following:

     (a) The acquisition by any individual, entity or "group" (within the
meaning of Section 13(d)(3) or 14(d)(2) of the Securities Exchange Act of 1934,
as amended (the "Exchange Act")) of beneficial ownership (within the meaning of
Rule 13d-3 promulgated under the Exchange Act) of thirty-three percent (33%) or
more of either (i) the then outstanding shares of common stock of the Company
(the "Outstanding Company Common Stock") or (ii) the combined voting power of
the then outstanding voting securities of the Company entitled to vote generally
in the election of directors (the "Outstanding Company Voting Securities");
provided, however, that the following acquisitions of common stock shall not
constitute a Change of Control:  (i) any acquisition directly from the Company
(excluding an acquisition by virtue of the exercise of a conversion privilege or
by one person or a group of persons acting in concert), (ii) any acquisition by
the Company, (iii) any acquisition by any employee benefit plan (or related
trust) sponsored or maintained by the Company or any corporation controlled by
the Company or (iv) any acquisition by any corporation pursuant to a
reorganization, merger or consolidation which would not be a Change of Control
under subsection (c) of this Section 2; or

     (b) Individuals who, as of the date hereof, constitute the Board (the
"Incumbent Board") cease for any reason to constitute at least a majority of the
Board; provided, however, that any individual becoming a director subsequent to
the date hereof whose election, or nomination for election by the Company's
shareholders, was approved by a vote of at least a majority of the directors
then comprising the Incumbent Board shall be considered as though such
individual were a member of the Incumbent Board, but excluding, for this
purpose, any such individual whose initial assumption of office occurs as a
result of either an actual or threatened "election contest" or other actual or
threatened "solicitation" (as such terms are used in Rule 14a-11 of Regulation
14A promulgated under the Exchange Act) of proxies or consents by or on behalf
of a person other than the Incumbent Board; or

     (c) Approval by the shareholders of the Company of a reorganization,
merger or consolidation, unless, following such reorganization, merger or
consolidation, (i) more than two-thirds (2/3) of, respectively, the then
outstanding shares of common stock of the corporation resulting from such
reorganization, merger or consolidation and the combined voting power of the
then outstanding voting securities of such corporation entitled to vote
generally in the election of directors is then beneficially owned, directly or
indirectly, by all or substantially all of 
<PAGE>
 
the individuals and entities who were the beneficial owners, respectively, of
the Outstanding Company Common Stock and Outstanding Company Voting Securities
immediately prior to such reorganization, merger or consolidation in
substantially the same proportions as their ownership, immediately prior to such
reorganization, merger or consolidation, (ii) no person (excluding the Company,
any employee benefit plan (or related trust) of the Company or such corporation
resulting from such reorganization, merger or consolidation and any person
beneficially owning, immediately prior to such reorganization, merger or
consolidation, directly or indirectly, thirty-three percent (33%) or more of the
Outstanding Company Common Stock or Outstanding Voting Securities, as the case
may be) beneficially owns, directly or indirectly, thirty-three percent (33%) or
more of, respectively, the then outstanding shares of common stock of the
corporation resulting from such reorganization, merger or consolidation or the
combined voting power of the then outstanding voting securities of such
corporation, entitled to vote generally in the election of directors and (iii)
at least a majority of the members of the board of directors of the corporation
resulting from such reorganization, merger or consolidation were members of the
Incumbent Board at the time of the execution of the initial agreement providing
for such reorganization, merger or consolidation; or

     (d) Approval by the shareholders of the Company of (i) a complete
liquidation or dissolution of the Company or (ii) the sale or other disposition
of all or substantially all of the assets of the Company, other than to a
corporation, with respect to which following such sale or other disposition, (A)
more than two-thirds (2/3) of, respectively, the then outstanding shares of
common stock of such corporation and the combined voting power of the then
outstanding voting securities of such corporation entitled to vote generally in
the election of directors is then beneficially owned, directly or indirectly, by
all or substantially all of the individuals and entities who were the beneficial
owners, respectively, of the Outstanding Company Common Stock and Outstanding
Company Voting Securities immediately prior to such sale or other disposition in
substantially the same proportion as their ownership, immediately prior to such
sale or other disposition, of the Outstanding Company Common Stock and
Outstanding Company Voting Securities, as the case may be, (B) no person
(excluding the Company and any employee benefit plan (or related trust) of the
Company or such corporation and any person beneficially owning, immediately
prior to such sale or other disposition, directly or indirectly, thirty-three
percent (33%) or more of the Outstanding Company Common Stock or Outstanding
Company Voting Securities, as the case may be) beneficially owns, directly or
indirectly, thirty-three percent (33%) or more of, respectively, the then
outstanding shares of common stock of such corporation or the combined voting
power of the then outstanding voting securities of such corporation entitled to
vote generally in the election of directors and (C) at least a majority of the
members of the board of directors of such corporation were members of the
Incumbent Board at the time of the execution of the initial agreement or action
of the Board providing for such sale or other disposition of assets of the
Company.

     3.  Employment.  (a) Subject to the provisions of Section 3, hereof, the
Company agrees to continue to employ the Executive and the Executive agrees to
remain in the employ of the Company during the Employment Term.  During the
Employment Term, Executive's position (including status, offices, titles and
reporting requirements), authority, duties and responsibilities shall be at
least commensurate in all material respects with the most significant of those
held or 
<PAGE>
 
assigned at any time during the twelve (12) month period immediately preceding
the Effective Date, and Executive's services shall be performed at the location
where Executive was employed immediately preceding the Effective Date or at any
office or location less than thirty-five (35) miles from such location, unless
mutually agreed to in writing by the parties.

     (b) Excluding periods of vacation and sick leave to which the Executive is
entitled, during the Employment Term the Executive agrees to devote full time
attention to the business and affairs of the Company to the extent necessary to
discharge the responsibilities assigned to the Executive hereunder, provided
that the Executive may take reasonable amounts of time to (i) serve on
corporate, civil or charitable boards or committees, and (ii) deliver lectures,
fulfill speaking engagements or teach at educational institutions, if such
activities do not significantly interfere with the performance of the
Executive's responsibilities hereunder.  It is expressly understood and agreed
that to the extent any such activities have been conducted by the Executive
prior to the Effective Date, the continued conduct of such activities (or the
conduct of activities similar in nature and scope) subsequent to the Effective
Date shall not thereafter be deemed to interfere with the performance of
Executive's responsibilities hereunder.

     4.  Compensation.  (a)  Base Salary.  During the Employment Term, the
Executive shall receive an annual base salary ("Annual Base Salary"), which
shall be paid at a monthly rate, at least equal to twelve (12) times the highest
monthly base salary paid or payable to the Executive by the Company and its
affiliated companies in respect of the twelve (12) month period immediately
preceding the month in which the Effective Date occurs.  During the Employment
Term, the Annual Base Salary shall be reviewed at least annually and shall be
increased at any time and from time to time as shall be substantially consistent
with increases in base salary generally awarded in the ordinary course of
business to other peer executives of the Company and its affiliated companies.
Any increase in Annual Base Salary shall not serve to limit or reduce any other
obligation to the Executive under this Agreement.  Annual Base Salary shall not
be reduced after any such increase and the term Annual Base Salary as utilized
in this Agreement shall refer to Annual Base Salary as so increased.  As used in
this Agreement, the term "affiliated companies" shall include any company
controlled by, controlling or under common control with the Company.

     (b) Annual Bonus.  In addition to Annual Base Salary, the Executive shall
be awarded, for each fiscal year ending during the Employment Term, an annual
bonus (the "Annual Bonus") in cash at least equal to the average annualized (for
any fiscal year consisting of less than twelve (12) full months or with respect
to which the Executive has been employed by the Company for less than twelve
(12) full months) bonuses paid or payable, including any amounts which were
deferred under any plans of the Company and its affiliated companies, to the
Executive by the Company and its affiliated companies in respect of the three
(3) fiscal years immediately preceding the fiscal year in which the Effective
Date occurs (the "Recent Average Bonus").  Each such Annual Bonus shall be paid
no later than seventy-five (75) days after the end of the fiscal year for which
the Annual Bonus is awarded, unless the Executive shall elect to defer the
receipt of such Annual Bonus under any plan or arrangement of the Company
allowing therefor.
<PAGE>
 
     (c) Incentive, Savings and Retirement Plans.  During the Employment Term,
the Executive shall be entitled to participate in all incentive, savings and
retirement plans, practices, policies and programs applicable generally to other
peer executives of the Company and its affiliated companies, but in no event
shall such plans, practices, policies and programs provide the Executive with
incentive opportunities (measured with respect to both regular and special
incentive opportunities, to the extent, if any, that such distinction is
applicable), savings opportunities and retirement benefit opportunities, in each
case, less favorable, in the aggregate, than the most favorable of those
provided by the Company and its affiliated companies for the Executive under
such plans, practices, policies and programs as in effect at any time during the
twelve (12) month period immediately preceding the Effective Date, or, if more
favorable to the Executive, those provided generally at any time after the
Effective Date to other peer executives of the Company and its affiliated
companies.

     (d) Benefit Plans.  During the Employment Term, the Executive and/or the
Executive's family, as the case may be, shall be eligible for participation in
and shall receive all benefits under benefit plans, practices, policies and
programs provided by the Company and its affiliated companies (including,
without limitation, medical, prescription drug, dental, disability, salary
continuance, employee life, group life, accidental death and travel accident
insurance plans and programs) to the extent applicable generally to other peer
executives of the Company and its affiliated companies and their families; but
in no event shall such plans, practices, policies and programs provide the
Executive with benefits which are less favorable, in the aggregate, than the
most favorable of such plans, practices, policies and programs in effect for the
Executive and his family at any time during the twelve (12) month period
immediately preceding the Effective Date or, if more favorable to the Executive,
those provided generally at any time after the Effective Date to other peer
executives of the Company and its affiliated companies and their families.

     (e) Expenses.  During the Employment Term, the Executive shall be entitled
to receive prompt reimbursement for all reasonable expenses incurred by the
Executive in accordance with the most favorable policies, practices and
procedures of the Company and its affiliated companies in effect for the
Executive at any time during the twelve (12) month period immediately preceding
the Effective Date or, if more favorable to the Executive, as in effect
generally at any time thereafter with respect to other peer executives of the
Company and its affiliated companies.

     (f) Fringe Benefits.  During the Employment Term, the Executive shall be
entitled to fringe benefits (including but not limited to Company cars, club
dues and physical examinations) in accordance with the most favorable plans,
practices, programs and policies of the Company and its affiliated companies in
effect for the Executive at any time during the twelve (12) month period
immediately preceding the Effective Date or, if more favorable to the Executive,
as in effect generally at any time thereafter with respect to other peer
executives of the Company and its affiliated companies.

     (g) Office and Support Staff.  During the Employment Term, the Executive
shall be entitled to an office or offices of a size and with furnishings and
other appointments, and to exclusive personal secretarial and other assistance,
at least equal to the most favorable of the 
<PAGE>
 
foregoing provided to the Executive by the Company and its affiliated companies
at any time during the twelve (12) month period immediately preceding the
Effective Date or, if more favorable to the Executive, as provided generally at
any time thereafter with respect to other peer executives of the Company and its
affiliated companies.

     (h) Vacation and Sick Leave.  During the Employment Term, the Executive
shall be entitled to paid vacation and sick leave (without loss of pay) in
accordance with the most favorable plans, policies, programs and practices of
the Company and its affiliated companies as in effect for the Executive at any
time during the twelve (12) month period immediately preceding the Effective
Date or, if more favorable to the Executive, as in effect generally at any time
thereafter with respect to other peer executives of the Company and its
affiliated companies.

     (i) Restrictions.  As of the Effective Date, all restrictions limiting the
exercise, transferability or other incidents of ownership of any outstanding
award, including but not limited to restricted stock, options, stock
appreciation rights, or other property or rights of the Company granted to the
Executive shall lapse, and such awards shall become fully vested and be held by
the Executive free and clear of all such restrictions.  This provision shall
apply to all such property or rights notwithstanding the provisions of any other
plan or agreement, unless the effect of the application of this provision to a
particular right or property would result in such right or property failing to
qualify for favorable tax treatment under the particular section of the Internal
Revenue Code for which it was designed to qualify, or would result in the loss
of favorable securities law treatment for participants under the plan pursuant
to which the award was granted.

     5.  Termination of Employment.  During the Employment Term, the Executive's
employment hereunder may be terminated under the following circumstances:

     (a) Death or Disability.  The Executive's employment shall terminate
automatically upon the Executive's death during the Employment Term.  If the
Company determines in good faith that the Disability of the Executive has
occurred during the Employment Term (pursuant to the definition of Disability
set forth below), it may give to the Executive written notice in accordance with
Section 5 of this Agreement of its intention to terminate the Executive's
employment.  In such event, the Executive's employment with the Company shall
terminate effective on the thirtieth (30th) day after receipt of such notice by
the Executive (the "Disability Effective Date"), provided that, within thirty
(30) days after such receipt, the Executive shall not have returned to full-time
performance of the Executive's duties.  For purposes of this Agreement,
"Disability" shall mean the absence of the Executive from the Executive's duties
with the Company on a full-time basis for one hundred eighty (180) consecutive
business days as a result of incapacity due to mental or physical illness which
is determined to be total and permanent by a physician selected by the Company
or its insurers and acceptable to the Executive or the Executive's legal
representative, provided if the parties are unable to agree, the parties shall
request the Dean of the Medical College of Wisconsin to choose such physician.

     (b) Cause.  The Company may terminate the Executive's employment for
"Cause."  A termination for Cause is a termination evidenced by a resolution
adopted in good faith by a 
<PAGE>
 
majority of the Board that the Executive (i) willfully, deliberately and
continually failed to substantially perform his duties under Section 3, above
(other than a failure resulting from the Executive's incapacity due to physical
or mental illness) which failure constitutes gross misconduct, and results in
and was intended to result in demonstrable material injury to the Company,
monetary or otherwise, or (ii) committed acts of fraud and dishonesty
constituting a felony, as determined by a final judgment or order of a court of
competent jurisdiction, and resulting or intended to result in gain to or
personal enrichment of the Executive at the Company's expense, provided,
however, that no termination of the Executive's employment shall be for Cause as
set forth in (i), above, until (a) Executive shall have had at least sixty (60)
days to cure any conduct or act alleged to provide Cause for termination after a
written notice of demand has been delivered to the Executive specifying in
detail the manner in which the Executive's conduct violates this Agreement, and
(b) the Executive shall have been provided an opportunity to be heard by the
Board (with the assistance of the Executive's counsel if the Executive so
desires). No act, or failure to act, on the Executive's part, shall be
considered "willful" unless he has acted or failed to act in bad faith and
without a reasonable belief that his action or failure to act was in the best
interest of the Company. Notwithstanding anything contained in this Agreement to
the contrary, no failure to perform by the Executive after Notice of Termination
is given by the Executive shall constitute Cause for purposes of this Agreement.

     (c) Good Reason.

          (1) The Executive may terminate his employment for Good Reason.  For
     purposes of this Agreement, "Good Reason" shall mean the occurrence after a
     Change of Control of any of the events or conditions described in
     Subsections (i) through (vi) hereof:

               (i) A change in the Executive's status, title, position or
          responsibilities (including reporting responsibilities) which, in the
          Executive's reasonable judgment, does not represent a promotion from
          his status, title, position or responsibilities as in effect
          immediately prior thereto; the assignment to the Executive of any
          duties or responsibilities which, in the Executive's reasonable
          judgment, are inconsistent with his status, title, position or
          responsibilities in effect immediately prior to such assignment; or
          any removal of the Executive from or failure to reappoint or reelect
          him to any position, except in connection with the termination of his
          employment for Disability, Cause, as a result of his death or by the
          Executive other than for Good Reason;

               (ii) Any failure by the Company to comply with any of the
          provisions of Section 4 of this Agreement.

               (iii) The insolvency or the filing (by any party, including the
          Company) of a petition for bankruptcy of the Company;

               (iv) Any material breach by the Company of any provision of this
          Agreement;
<PAGE>
 
               (v) Any purported termination of the Executive's employment for
          Cause by the Company which does not comply with the terms of Section 5
          of this Agreement; and

               (vi) The failure of the Company to obtain an agreement,
          satisfactory to the Executive, from any successor or assign of the
          Company, to assume and agree to perform this Agreement, as
          contemplated in Section 10 hereof.

          (2) Any event or condition described in Section 5(c)(1) which occurs
     prior to the Effective Date but which the Executive reasonably demonstrates
     (i) was at the request of a third party who has indicated an intention or
     taken steps reasonably calculated to effect a Change of Control, or (ii)
     otherwise arose in connection with or in anticipation of a Change of
     Control, shall constitute Good Reason for purposes of this Agreement
     notwithstanding that it occurred prior to the Effective Date.

          (3) The Executive's right to terminate his employment pursuant to
     this Section 5(c) shall not be affected by his incapacity due to physical
     or mental illness.  The Executive's continued employment or failure to give
     Notice of Termination shall not constitute consent to, or a waiver of
     rights with respect to, any circumstances constituting Good Reason
     hereunder.

          (4) For purposes of this Section 5(c), any good faith determination
     of Good Reason made by the Executive shall be conclusive.  Anything in this
     Agreement to the contrary notwithstanding, a termination by the Executive
     for any reason or for no reason during the sixty (60) day period commencing
     on the date six (6) months after the Effective Date shall be deemed to be a
     termination by the Executive for Good Reason for all purposes of this
     Agreement.

     (d) Voluntary Termination.  The Executive may voluntarily terminate his
employment hereunder at any time.

     (e) Notice of Termination.  Any purported termination by the Company or by
the Executive (other than by death of the Executive) shall be communicated by
Notice of Termination to the other.  For purposes of this Agreement, a "Notice
of Termination" shall mean a written notice which (i) indicates the specific
termination provision in this Agreement relied upon, (ii) to the extent
applicable, sets forth in reasonable detail the facts and circumstances claimed
to provide a basis for termination of the Executive's employment under the
provision so indicated, and (iii) the Termination Date.  For purposes of this
Agreement, no such purported termination of employment shall be effective
without such Notice of Termination.

     (f) Termination Date, etc.  "Termination Date" shall mean in the case of
the Executive's death, his date of death, or in all other cases, the date
specified in the Notice of Termination subject to the following:

          (1) If the Executive's employment is terminated by the Company, the
     date specified in the Notice of Termination shall be at least thirty (30)
     days after the date the 
<PAGE>
 
     Notice of Termination is given to the Executive, provided, however, that in
     the case of Disability, the Executive shall not have returned to the full-
     time performance of his duties during such period of at least thirty (30)
     days;

          (2) If the Executive's employment is terminated for Good Reason, the
     date specified in the Notice of Termination shall not be more than sixty
     (60) days after the date the Notice of Termination is given to the Company;
     and

          (3) In the event that within thirty (30) days following the date of
     receipt of the Notice of Termination, one party notifies the other that a
     dispute exists concerning the basis for termination, the Executive's
     employment hereunder shall not be terminated except after the dispute is
     finally resolved and a Termination Date is determined either by a mutual
     written agreement of the parties, or by a binding and final judgment order
     or decree of a court of competent jurisdiction (the time for appeal
     therefrom having expired and no appeal having been perfected).

     6.  Obligations of the Company Upon Termination.

     (a) Good Reason; Other Than for Cause, Death or Disability.  If, during
the Employment Term, the Company shall terminate the Executive's employment
other than for Cause or Disability or the Executive shall terminate employment
for Good Reason:

          (i) The Company shall pay to the Executive in a lump sum in cash
     within five (5) days after the Termination Date the aggregate of the
     following amounts:

               A. The sum of:

                    (1) The Executive's Annual Base Salary through the
               Termination Date to the extent not theretofore paid.

                    (2) The product of (x) the higher of (I) the Recent Average
               Bonus and (II) the Annual Bonus paid or payable, including any
               amount deferred, (and annualized for any fiscal year consisting
               of less than twelve (12) full months or for which the Executive
               has been employed for less than twelve (12) full months) for the
               most recently completed fiscal year during the Employment Period,
               if any (such higher amount being referred to as the "Highest
               Annual Bonus.) and (y) a fraction, the numerator of which is the
               number of days completed in the current fiscal year through the
               Termination Date, and the denominator of which is 365; and

                    (3) Any compensation previously deferred by the Executive
               (together with any accrued interest or earnings thereon) and any
               accrued vacation pay, in each case to the extent not theretofore
               paid.

               The sum of the amounts described in Clauses (1), (2) and (3)
          shall be hereinafter referred to as the "Accrued Obligations";
<PAGE>
 
               B. The amount equal to the product of (1) three and (2) the sum
          of (x) the Executive's Annual Base Salary (increased for this purpose
          by any Section 401(k) deferrals, cafeteria plan elections, or other
          deferrals that would have increased Executive's Annual Base Salary if
          paid in cash to Executive when earned) and (y) the Executive's Highest
          Annual Bonus;

               C. A separate lump-sum supplemental retirement benefit equal to
          the difference between (1) the actuarial equivalent (utilizing for
          this purpose the most favorable to the Executive actuarial assumptions
          and Company contribution history with respect to the applicable
          retirement plan, incentive plans, savings plans and other plans
          described in Section 4(c) (or any successor plan thereto) (the
          "Retirement Plans") during the twelve (12) month period immediately
          preceding the Effective Date) of the benefit payable under the
          Retirement Plans and any supplemental and/or excess retirement plan
          providing benefits for the Executive (the "SERP") which the Executive
          would receive if the Executive's employment continued for an
          additional three (3) years after the Termination Date with annual
          compensation equal to the sum of the Annual Base Salary and Highest
          Annual Bonus, assuming for this purpose that all accrued benefits and
          contributions are fully vested and that benefit accrual formulas and
          Company contributions are no less advantageous to the Executive than
          those in effect during the twelve (12) month period immediately
          preceding the Effective Date, and (2) the actuarial equivalent
          (utilizing for this purpose the actuarial assumptions utilized with
          respect to the Retirement Plans during the twelve (12) month period
          immediately preceding the Effective Date) of the Executive's actual
          benefit (paid or payable), if any, under the Retirement Plans and the
          SERP.  For example, if there were a termination today this
          supplemental retirement benefit would be interpreted with respect to
          two plans in existence today as follows: (i) with respect to the
          Retirement Growth Plan of the Company, the Executive would receive no
          less than three times eight percent (8%) of the maximum compensation
          that can be taken into account under the Plan assuming Executive's
          compensation is as set forth above, and (ii) with respect to the
          incentive Savings Plan of the Company, the Executive would receive no
          less than three times an annual Company match of fifty percent (50%)
          of Employee's maximum allowable contribution to the Plan assuming
          Executive's compensation is as set forth above; and

               D. The amount equal to the product of (i) three and (ii) the sum
          of (x) the imputed income reflected on Executive's W-2 attributable to
          the car provided to Executive by the Company or its affiliates for the
          last calendar year ending before the Effective Date and (y) the club
          dues for Executive paid by the Company or its affiliates attributable
          to such year.

          (ii) For thirty-six (36) months after the Termination Date, or such
     longer period as any plan, program, practice or policy may provide, the
     Company shall continue benefits to the Executive and/or the Executive's
     family at least equal to those which would have been provided to them in
     accordance with the plans, programs, practices and 
<PAGE>
 
     policies described in Section 4(d) of this Agreement if the Executive's
     employment had not been terminated in accordance with the most favorable
     plans, practices, programs or policies of the Company and its affiliated
     companies applicable generally to other peer executives and their families
     during the twelve (12) month period immediately preceding the Effective
     Date or, if more favorable to the Executive, as in effect generally at any
     time thereafter with respect to other peer executives of the Company and
     its affiliated companies and their families; provided, however, that if the
     Executive becomes reemployed with another employer and is eligible to
     receive medical or other benefits under another employer provided plan, the
     medical and other benefits described herein shall be secondary to those
     provided under such other plan during such applicable period of
     eligibility, provided that the aggregate coverage of the combined benefit
     plans is no less favorable to the Executive, in terms of amounts and
     deductibles and costs to him, than the coverage required hereunder. For
     purposes of determining eligibility of the Executive for retiree benefits
     pursuant to such plans, practices, programs and policies, the Executive
     shall be considered to have remained employed until the end of such thirty-
     six (36) month period and to have retired on the last day of such period.

          (iii) The Executive shall have the right to purchase the car provided
     to him by the Company or its affiliates during the twelve (12) month period
     immediately preceding the Effective Date (or a comparable car acceptable to
     the Executive if such car is no longer owned by the Company or its
     affiliates), at the book value thereof on the Termination Date, exercisable
     within thirty (30) days after the Termination Date; and if the car is not
     purchased, Executive shall return the car to the Company.

          (iv) The Executive shall have the right to use reasonable office and
     secretarial assistance for a period of twelve (12) months after the
     Termination Date.

          (v) The Executive shall have the option of purchasing any life
     insurance owned by the Company or its affiliates on the life of Executive
     for the Company's investment in the contract, exercisable at any time
     within thirty (30) days after the Termination Date; and the Company agrees
     during the Employment Term not to terminate, sell, transfer or otherwise
     dispose of any such insurance without first allowing Executive the
     opportunity to exercise such option.

          (vi) To the extent not theretofore paid or provided, the Company
     shall timely pay or provide to the Executive any other amounts or benefits
     required to be paid or provided or which the Executive is eligible to
     receive pursuant to this Agreement under any plan, program, policy or
     practice or contract or agreement of the Company and its affiliated
     companies (such other amounts and benefits shall be hereinafter referred to
     as the "Other Benefits.).

     (b) Death.  If the Executive's employment is terminated by reason of the
Executive's death during the Employment Term, this Agreement shall terminate
without further obligations to the Executive's legal representatives under this
Agreement, except that the Company shall pay or provide the Accrued Obligations,
six (6) months of Annual Base Salary, and the Other 
<PAGE>
 
Benefits. The Accrued obligations shall be paid to the Executive's estate or
beneficiary, as applicable, in a lump sum in cash within thirty (30) days of the
Termination Date. The six (6) months of Annual Base Salary shall be paid during
the six (6) month period following the Termination Date on a monthly basis. With
respect to the provision of Other Benefits, the term Other Benefits as utilized
in this Section 6(b) shall include, and the Executive's family shall be entitled
to receive, benefits at least equal to the most favorable benefits provided by
the Company and any of its affiliated companies to surviving families of peer
executives of the Company and such affiliated companies under such plans,
programs, practices and policies relating to family death benefits, if any, as
in effect with respect to other peer executives and their families at any time
during the twelve (12) month period immediately preceding the Effective Date or,
if more favorable to the Executive and/or the Executive's family, as in effect
on the date of the Executive's death with respect to other peer executives of
the Company and its affiliated companies and their families.

     (c) Disability.  If the Executive's employment is terminated by reason of
the Executive's Disability during the Employment Term, this Agreement shall
terminate without further obligations to the Executive, except that the Company
shall pay or provide the Accrued Obligations and the Other Benefits.  The
Accrued Obligations shall be paid to the Executive in a lump sum in cash within
thirty (30) days of the Termination Date.  With respect to the provision of
Other Benefits, the term Other Benefits as utilized in this Section 6(c) shall
include, and the Executive shall be entitled after the Disability Effective Date
to receive, disability and other benefits at least equal to the most favorable
of those generally provided by the Company and its affiliated companies to
disabled executives and/or their families in accordance with such plans,
programs, practices and policies relating to disability, if any, as in effect
generally with respect to other peer executives and their families at any time
during the twelve (12) month period immediately preceding the Effective Date or,
if more favorable to the Executive and/or the Executive's family, as in effect
at any time thereafter generally with respect to other peer executives of the
Company and its affiliated companies and their families.

     (d) Cause; Other Than for Good Reason.  If the Executive's employment
shall be terminated for Cause during the Employment Term, or if the Executive
voluntarily terminates employment during the Employment Term for other than Good
Reason, this Agreement shall terminate without further obligations to the
Executive other than the obligation to pay to the Executive Annual Base Salary
through the Date of Termination, any other amounts earned or accrued through the
Termination Date, and the amount of any compensation previously deferred by the
Executive, in each case to the extent theretofore unpaid; provided that if
Executive voluntarily terminates Executive shall receive the benefits normally
provided upon normal or early retirement with respect to other peer Executives
and their families to the extent he qualifies therefore.  All salary or
compensation hereunder shall be paid to the Executive in a lump sum in cash
within thirty (30) days of the Date of Termination.

     (e) If any of the payments referred to in this Section 6 are not paid
within the time specified after the Termination Date (hereinafter a "Delinquent
Payment"), in addition to such principal sum, the Company will pay to the
Executive interest on all such Delinquent Payments 
<PAGE>
 
computed at the prime rate as announced from time to time by M&I Marshall &
Ilsley Bank, or its successor, compounded monthly.

     7.  No Mitigation.  In no event shall the Executive be obligated to seek
other employment or take any other action by way of mitigation of the amounts
payable to the Executive under any of the provisions of this Agreement and such
amounts shall not be reduced (except to the extent set forth in Section
6(a)(ii)) whether or not the Executive obtains other employment.

     8.  Excise Tax Payments.

     (a) Notwithstanding anything contained in this Agreement to the contrary,
in the event that any payment or distribution to or for the benefit of the
Executive, whether paid or payable or distributed or distributable pursuant to
the terms of this Agreement or otherwise in connection with, or arising out of,
his employment with the Company (a "Payment" or "Payments"), would be subject to
the excise tax imposed by Section 4999 of the Internal Revenue Code of 1986, as
amended (the "Code")), or any interest or penalties are incurred by the
Executive with respect to such excise tax (such excise tax, together with any
interest and penalties, are collectively referred to as the "Excise Tax"), then
the Executive shall be entitled to receive an additional payment (a "Gross-Up
Payment") in an amount such that after payment by the Executive of all taxes
(including any interest or penalties imposed with respect to such taxes),
including any Excise Tax, imposed upon the Gross-Up Payment, the Executive
retains an amount of the Gross-Up Payment equal to the Excise Tax imposed upon
the Payments.

     (b) A determination shall be made as to whether and when a Gross-Up
Payment is required pursuant to this Section 8 and the amount of such Gross-Up
Payment, such determination to be made within fifteen (15) business days of the
Termination Date, or such other time as requested by the Company or by the
Executive (provided the Executive reasonably believes that any of the Payments
may be subject to the Excise Tax).  Such determination shall be made by a
national independent accounting firm selected by the Executive (the "Accounting
Firm").  All fees, costs and expenses (including, but not limited to, the cost
of retaining experts) of the Accounting Firm shall be borne by the Company and
the Company shall pay such fees, costs and expenses as they become due.  The
Accounting Firm shall provide detailed supporting calculations, acceptable to
the Executive, both to the Company and the Executive.  The Gross-Up Payment, if
any, as determined pursuant to this Section 8(b) shall be paid by the Company to
the Executive within five (5) business days of the receipt of the Accounting
Firm's determination.  If the Accounting Firm determines that no Excise Tax is
payable by the Executive with respect to a Payment or Payments, it shall furnish
the Executive with an unqualified opinion that no Excise Tax will be imposed
with respect to any such Payment or Payments.  Any such initial determination by
the Accounting Firm of the Gross-Up Payment shall be binding upon the Company
and the Executive subject to the application of Section 8(c).

     (c) As a result of the uncertainty in the application of Sections 4999 and
280G of the Code, it is possible that a Gross-Up Payment (or a portion thereof)
will be paid which should not have been paid (an "Overpayment") or a Gross-Up
Payment (or a portion thereof) which should have been paid will not have been
paid (an "Underpayment").  An Underpayment shall be 
<PAGE>
 
deemed to have occurred upon notice (formal or informal) to the Executive from
any governmental taxing authority that the tax liability of the Executive
(whether in respect of the then current taxable year of the Executive or in
respect of any prior taxable year of the Executive) may be increased by reason
of the imposition of the Excise Tax on a Payment or Payments with respect to
which the Company has failed to make a sufficient Gross-Up Payment. An
Overpayment shall be deemed to have occurred upon a "Final Determination" (as
hereinafter defined) that the Excise Tax shall not be imposed upon a Payment or
Payments with respect to which the Executive had previously received a Gross-Up
Payment. A Final Determination shall be deemed to have occurred when the
Executive has received from the applicable governmental taxing authority a
refund of taxes or other reduction in his tax liability by reason of the
Overpayment and upon either (i) the date a determination is made by, or an
agreement is entered into with, the applicable governmental taxing authority
which finally and conclusively binds the Executive and such taxing authority, or
in the event that a claim is brought before a court of competent jurisdiction,
the date upon which a final determination has been made by such court and either
all appeals have been taken and finally resolved or the time for all appeals has
expired or (ii) the expiration of the statute of limitations with respect to the
Executive's applicable tax return. If an Underpayment occurs, the Executive
shall promptly notify the Company and the Company shall pay to the Executive at
least five (5) business days prior to the date on which the applicable
governmental taxing authority has requested payment, an additional Gross-Up
Payment equal to the amount of the Underpayment plus any interest and penalties
imposed on the Underpayment. If an Overpayment occurs, the amount of the
Overpayment shall be treated as a loan by the Company to the Executive and the
Executive shall, within ten (10) business days of the occurrence of such
Overpayment, pay to the Company the amount of the Overpayment plus interest at
an annual rate equal to the rate provided for in Section 1274(b)(2)(B) of the
Code from the date the Gross-Up Payment (to which the Overpayment relates) was
paid to the Executive.

     (d) Notwithstanding anything contained in this Agreement to the contrary,
in the event it is determined that an Excise Tax will be imposed on any Payment
or Payments, the Company shall pay to the applicable governmental taxing
authorities as Excise Tax withholding, the amount of the Excise Tax that the
Company has actually withheld from the Payment or Payments.

     9.  Unauthorized Disclosure.  The Executive shall not make any Unauthorized
Disclosure while employed by the Company and for the two-year period subsequent
to the termination of his employment with the Company.  For purposes of this
Agreement, "Unauthorized Disclosure" shall mean disclosure by the Executive
without the consent of the Board to any person, other than an employee of the
Company or a person to whom disclosure is reasonably necessary or appropriate in
connection with the performance by the Executive of his duties as an executive
of the Company or as may be legally required, of any confidential information
obtained by the Executive while in the employ of the Company (including, but not
limited to, any confidential information with respect to any of the Company's
customers or methods of operation) the disclosure of which he knows or has
reason to believe will be materially injurious to the Company; provided,
however, that such term shall not include the use or disclosure by the
Executive, without consent, of any information known generally to the public
(other than as a 
<PAGE>
 
result of disclosure by him in violation of this Section 9) or any information
not otherwise considered confidential by a reasonable person engaged in the same
business as that conducted by the Company. Notwithstanding the foregoing, the
Executive's obligation hereunder not to make any Unauthorized Disclosure shall
continue after the end of the two-year period following his termination of
employment with the Company as regards any information which is a trade secret
as defined in Section 134.90 of the Wisconsin Statutes. In no event shall an
asserted violation of this Section 9 constitute a basis for deferring or
withholding any amounts otherwise payable to the Executive under this Agreement.

     10.  Successors and Assigns.

     (a) This Agreement shall be binding upon and shall inure to the benefit of
the Company, its successors and assigns and the Company shall require any
successor or assign (whether direct or indirect, by purchase, merger,
consolidation or otherwise) to expressly assume and agree to perform this
Agreement in the same manner and to the same extent that the Company would be
required to perform if no such succession or assignment had taken place.  The
term "Company" as used herein shall include such successors and assigns.  The
term "successors and assigns" as used herein shall mean a corporation or other
entity acquiring all or substantially all the assets and business of the Company
(including this Agreement) whether by operation of law or otherwise.

     (b) Neither this Agreement nor any right or interest hereunder shall be
assignable or transferable by the Executive, his beneficiaries or legal
representatives, except by will or by the laws of descent and distribution.
This Agreement shall inure to the benefit of and be enforceable by the
Executive's legal representative.

     11.  Fees and Expenses.  From and after the Effective Date, the Company
shall pay all legal fees and related expenses (including the costs of experts,
evidence and counsel) reasonably incurred by the Executive as they become due as
a result of (i) the Executive's termination of employment (including all such
fees and expenses, if any, incurred in contesting or disputing any such
termination of employment), (ii) the Executive's hearing before the Board as
contemplated in Section 5(b) of this Agreement, (iii) the Executive's seeking to
obtain or enforce any right or benefit provided by this Agreement or by any
other plan or arrangement maintained by the Company under which the Executive is
or may be entitled to receive benefits or (iv) a dispute between the Executive
and the Internal Revenue Service (or any other taxing authority) with regard to
an "Underpayment" (as defined in Section 8 of this Agreement).

     12.  Notice.  For the purposes of this Agreement, notices and all other
communications provided for in the Agreement (including the Notice of
Termination) shall be in writing and shall be deemed to have been duly given
when personally delivered or sent by certified mail, return receipt requested,
postage prepaid, if to the Company, to Marshall & Ilsley Corporation, 770 North
Water Street, Milwaukee, Wisconsin 53202, or if to Executive, to the address set
forth below Executive's signature, or to such other address as the party may be
notified, provided that all notices to the Company shall be directed to the
attention of the Board with a copy to the Secretary of the Company.  All notices
and communications shall be deemed to have been 
<PAGE>
 
received on the date of delivery thereof or on the third business day after the
mailing thereof, except that notice of change of address shall be effective only
upon receipt.

     13.  Non-Exclusivity of Rights.  Nothing in this Agreement shall prevent or
limit the Executive's continuing or future participation in any benefit, bonus,
incentive or other plan or program provided by the Company or any of its
subsidiaries for which the Executive may qualify.  Amounts which are vested
benefits or which the Executive is otherwise entitled to receive under any plan
or program of the Company or any of its subsidiaries shall be payable in
accordance with such plan or program, except as explicitly modified by this
Agreement.

     14.  Settlement of Claims.  The Company's obligation to make the payments
provided for in this Agreement and otherwise to perform its obligations
hereunder shall not be affected by any circumstances, including, without
limitation, any set-off, counterclaim, recoupment, defense or other right which
the Company may have against the Executive or others.

     15.  Miscellaneous.  No provision of this Agreement may be modified, waived
or discharged unless such waiver, modification or discharge is agreed to in
writing and signed by the Executive and the Company.  No waiver by either party
hereto at any time of any breach by the other party hereto of, or compliance
with, any condition or provision of this Agreement to be performed by such other
party shall be deemed a waiver of similar or dissimilar provisions or conditions
at the same or at any prior or subsequent time.  No agreement or
representations, oral or otherwise, express or implied, with respect to the
subject matter hereof have been made by either party which are not expressly set
forth in this Agreement.

     16.  Employment.  The Executive and the Company acknowledge that the
employment of the Executive by the Company is "at will" and prior to the
Effective Date, may be terminated by either the Executive or the Company at any
time.  Moreover, if prior to the Effective Date, the Executive's employment with
the company terminates then the Executive shall have no further rights under
this Agreement.

     17.  Governing Law.  This Agreement shall be governed by and construed and
enforced in accordance with the laws of the State of Wisconsin without giving
effect to the conflict of law principles thereof.

     18.  Severability.  The provisions of this Agreement shall be deemed
severable and the invalidity or unenforceability of any provision shall not
affect the validity or enforceability of the other provisions hereof.

     19.  Entire Agreement.  This Agreement constitutes the entire agreement
between the parties hereto and supersedes all prior agreements, if any,
understandings and arrangements, oral or written, between the parties hereto
with respect to the subject matter hereof.  In consideration of the terms,
conditions and benefits to be provided under this Agreement, the Executive
hereby expressly waives all rights under that certain Employment Agreement
between the Executive and the Company dated November 16, 1987.
<PAGE>
 
     20.  Headings.  The headings herein contained are for reference only and
shall not affect the meaning or interpretation of any provision of this
Agreement.

     21.  Modification.  No provision of this Agreement may be modified, waived
or discharged unless such modification, waiver or discharge is agreed to in
writing signed by both the Executive and the Company.

     22.  Withholding.  The Company shall be entitled to withhold from amounts
paid to the Executive hereunder any federal, estate or local withholding or
other taxes or charges which it is, from time to time, required to withhold.
The Company shall be entitled to rely on an opinion of counsel if any question
as to the amount or requirement of any such withholding shall arise.

<PAGE>
 
     IN WITNESS WHEREOF, the Company has caused this Agreement to be executed by
its duly authorized officer and the Executive has executed this Agreement as of
the day and year first above written.

                                    MARSHALL & ILSLEY CORPORATION


                                    By: __________________________
ATTEST:                                 Title:

_______________________________ 
Secretary
                                    EXECUTIVE:


                                    ______________________________
                                    Thomas M. Bolger

                                    Address: _____________________
                                             _____________________

<PAGE>
 
                                                                  Exhibit 10(oo)

                         FORM OF EMPLOYMENT AGREEMENTS
                  BETWEEN M&I AND MESSRS. O'NEILL AND WILLIAMS


<PAGE>
 
                              EMPLOYMENT AGREEMENT
                                        
     THIS AGREEMENT, entered into as of the ___ day of ___________, 1999, by and
between MARSHALL & ILSLEY CORPORATION (the "Company"), and _______________ the
"Executive") (hereinafter collectively referred to as "the parties").

                               W I T E S S E T H:

     WHEREAS, the Board of Directors of the Company (the "Board") recognizes
that the possibility of a Change of Control (as hereinafter defined in Section
2) exists and that the threat of or the occurrence of a Change of Control can
result in significant distractions of its key management personnel because of
the uncertainties inherent in such a situation; and

     WHEREAS, the Board has determined that it is essential and in the best
interest of the Company and its shareholders to retain the services of the
Executive in the event of a threat or occurrence of a Change of Control and to
ensure his continued dedication and efforts in such event without undue concern
for his personal financial and employment security; and

     WHEREAS, in order to induce the Executive to remain in the employ of the
Company, particularly in the event of a threat of or the occurrence of a Change
of Control, the Company desires to enter into this Agreement with the Executive.

     NOW, THEREFORE, in consideration of the respective agreements of the
parties contained herein, it is agreed as follows:

     1.  Employment Term.

          (a)  The "Employment Term" shall commence on the first date during the
Protected Period (as defined in Section l(c), below) on which a Change of
Control (as defined in Section 2, below) occurs (the "Effective Date") and shall
expire on the second anniversary of the Effective Date; provided, however, that
at the end of each day of the Employment Term the Employment Term shall
automatically be extended for one (I ) day unless either the Company or the
Executive shall have given written notice to the other at least thirty (30) days
prior thereto that the Employment Term shall not be so extended; and provided,
further, that the Employment Term shall not be automatically extended beyond the
first day of the month following the month in which the Executive attains age
sixty-five (65).

          (b)  Notwithstanding anything contained in this Agreement to the
contrary, if the Executive's employment is terminated prior to the Effective
Date and the Executive reasonably demonstrates that such termination (i) was at
the request of a third party who has indicated an intention or taken steps
reasonably calculated to effect a Change of Control, or (ii) otherwise occurred
in connection with or in anticipation of a Change of Control, then for all
purposes of this Agreement, the Effective Date shall mean the date immediately
prior to the date of such termination of the Executive's employment.

<PAGE>
 
          (c)  For purposes of this Agreement, the "Protected Period" shall be
the two (2) year period commencing on the date hereof, provided, however, that
at the end of each day the Protected Period shall be automatically extended for
one (1) day unless at least thirty (30) days prior thereto the Company shall
have given written notice to the Executive that the Protected Period shall not
be so extended; and provided, further, that notwithstanding any such notice by
the Company not to extend, the Protected Period shall not end if prior to the
expiration thereof any third party has indicated an intention or taken steps
reasonably calculated to effect a Change of Control, in which event the
Protected Period shall end only after such third party publicly announces that
it has abandoned all efforts to effect a Change of Control.

     2.  Chance of Control.  For purposes of this Agreement, a "Change of
Control, shall mean the first to occur of the following:

          (a)  The acquisition by any individual, entity or "group" (within the
meaning of Section 13(d)(3) or 1 4(d)(2) of the Securities Exchange Act of 1934,
as amended (the "Exchange Act")) of beneficial ownership (within the meaning of
Rule 1 3d-3 promulgated under the Exchange Act) of thirty-three percent (33%) or
more of either (i) the then outstanding shares of common stock of the Company
(the "Outstanding Company Common Stock") or (ii) the combined voting power of
the then outstanding voting securities of the Company entitled to vote generally
in the election of directors (the "Outstanding Company Voting Securities");
provided, however, that the following acquisitions of common stock shall not
constitute a Change of Control: (i) any acquisition directly from the Company
(excluding an acquisition by virtue of the exercise of a conversion privilege or
by one person or a group of persons acting in concert), (ii) any acquisition by
the Company, (iii) any acquisition by any employee benefit plan (or related
trust) sponsored or maintained by the Company or any corporation controlled by
the Company or (iv) any acquisition by any corporation pursuant to a
reorganization, merger or consolidation which would not be a Change of Control
under subsection (c) of this Section 2; or

          (b)  Individuals who, as of the date hereof, constitute the Board (the
"Incumbent Board") cease for any reason to constitute at least a majority of the
Board; provided, however, that any individual becoming a director subsequent to
the date hereof whose election, or nomination for election by the Company's
shareholders, was approved by a vote of at least a majority of the directors
then comprising the Incumbent Board shall be considered as though such
individual were a member of the Incumbent Board, but excluding, for this
purpose, any such individual whose initial assumption of office occurs as a
result of either an actual or threatened "election contest" or other actual or
threatened "solicitation" (as such terms are used in Rule 14a-11 of Regulation
14A promulgated under the Exchange Act) of proxies or consents by or on behalf
of a person other than the Incumbent Board; or

          (c)  Approval by the shareholders of the Company of a reorganization,
merger or consolidation, unless, following such reorganization, merger or
consolidation, (i) more than two-thirds (2/3) of, respectively, the then
outstanding shares of common stock of the corporation resulting from such
reorganization, merger or consolidation and the combined voting power of the
then outstanding voting securities of such corporation entitled to vote
generally in the election of directors is then beneficially owned, directly or
indirectly, by all or substantially all of 

<PAGE>
 
the individuals and entities who were the beneficial owners, respectively, of
the Outstanding Company Common Stock and Outstanding Company Voting Securities
immediately prior to such reorganization, merger or consolidation m
substantially the same proportions as their ownership, immediately prior to such
reorganization, merger or consolidation, (ii) no person (excluding the Company,
any employee benefit plan (or related trust) of the Company or such corporation
resulting from such reorganization, merger or consolidation and any person
beneficially owning, immediately prior to such reorganization, merger or
consolidation, directly or indirectly, thirty-three percent (33%) or more of the
Outstanding Company Common Stock or Outstanding Voting Securities, as the case
may be) beneficially owns, directly or indirectly, thirty-three percent (33%) or
more of, respectively, the then outstanding shares of common stock of the
corporation resulting from such reorganization, merger or consolidation or the
combined voting power of the then outstanding voting securities of such
corporation, entitled to vote generally in the election of directors and (iii)
at least a majority of the members of the board of directors of the corporation
resulting from such reorganization, merger or consolidation were members of the
Incumbent Board at the time of the execution of the initial agreement providing
for such reorganization, merger or consolidation; or

          (d)  Approval by the shareholders of the Company of (i) a complete
liquidation or dissolution of the Company or (ii) the sale or other disposition
of all or substantially all of the assets of the Company, other than to a
corporation, with respect to which following such sale or other disposition, (A)
more than two-thirds (2/3) of, respectively, the then outstanding shares of
common stock of such corporation and the combined voting power of the then
outstanding voting securities of such corporation entitled to vote generally in
the election of directors is then beneficially owned, directly or indirectly, by
all or substantially all of the individuals and entities who were the beneficial
owners, respectively, of the Outstanding Company Common Stock and Outstanding
Company Voting Securities immediately prior to such sale or other disposition in
substantially the same proportion as their ownership, immediately prior to such
sale or other disposition, of the Outstanding Company Common Stock and
Outstanding Company Voting Securities, as the case may be, (B) no person
(excluding the Company and any employee benefit plan (or related trust) of the
Company or such corporation and any person beneficially owning, immediately
prior to such sale or other disposition, directly or indirectly, thirty-three
percent (33%) or more of the Outstanding Company Common Stock or Outstanding
Company Voting Securities, as the case may be) beneficially owns, directly or
indirectly, thirty-three percent (33%) or more of, respectively, the then
outstanding shares of common stock of such corporation or the combined voting
power of the then outstanding voting securities of such corporation entitled to
vote generally in the elect on of directors and (C) at least a majority of the
members of the board of directors of such corporation were members of the
Incumbent Board at the time of the execution of the initial agreement or action
of the Board providing for such sale or other disposition of assets of the
Company.

     3.  Employment.

          (a)  Subject to the provisions of Section 3, hereof, the Company 
agrees to continue to employ the Executive and the Executive agrees to remain in
the employ of the Company during the Employment Term. During the Employment
Term, the Executive shall be employed
<PAGE>
 
as _____________________ of M&I Corporation or in such other executive capacity
as may be mutually agreed to in writing by the parties. During the Employment
Term, Executive's position (including status, offices, titles and reporting
requirements), authority, duties and responsibilities shall be at least
commensurate in all material respects with the most significant of those held or
assigned at any time during the twelve ( t 2) month period immediately preceding
the Effective Date, and Executive's services shall be performed at the location
where Executive was employed immediately preceding the Effective Date or at any
office or location less than thirty-five (35) miles from such location, unless
mutually agreed to in writing by the parties.

          (b)  Excluding periods of vacation and sick leave to which the
Executive is entitled, during the Employment Term the Executive agrees to devote
full time attention to the business and affairs of the Company to the extent
necessary to discharge the responsibilities assigned to the Executive hereunder,
provided that the Executive may take reasonable amounts of time to (i) serve on
corporate, civil or charitable boards or committees, and (ii) deliver lectures,
fulfill speaking engagements or teach at educational institutions, if such
activities do not significantly interfere with the performance of the
Executive's responsibilities hereunder.  It is expressly understood and agreed
that to the extent any such activities have been conducted by the Executive
prior to the Effective Date, the continued conduct of such activities (or the
conduct of activities similar in nature and scope) subsequent to the Effective
Date shall not thereafter be deemed to interfere with the performance of
Executive's responsibilities hereunder.

     4.  Compensation.

          (a)  Base Salary.  During the Employment Term, the Executive shall
receive an annual base salary ("Annual Base Salary"), which shall be paid at a
monthly rate, at least equal to twelve (12) times the highest monthly base
salary paid or payable to the Executive by the Company and its affiliated
companies in respect of the twelve (12) month period immediately preceding the
month in which the Effective Date occurs.  During the Employment Term, the
Annual Base Salary shall be reviewed at least annually and shall be increased at
any time and from time to time as shall be substantially consistent with
increases in base salary generally awarded in the ordinary course of business to
other peer executives of the Company and its affiliated companies.  Any increase
in Annual Base Salary shall not serve to limit or reduce any other obligation to
the Executive under this Agreement.  Annual Base Salary shall not be reduced
after any such increase and the term Annual Base Salary as utilized in this
Agreement shall refer to Annual Base Salary as so increased.  As used in this
Agreement, the term "affiliated companies" shall include any company controlled
by, controlling or under common control with the Company.

          (b)  Annual Bonus.  In addition to Annual Base Salary, the Executive
shall be awarded, for each fiscal year ending during the Employment Term, an
annual bonus (the "Annual Bonus") in cash at least equal to the average
annualized (for any fiscal year consisting of less than twelve (12) full months
or with respect to which the Executive has been employed by the Company for less
than twelve (12) full months bonuses paid or payable, including any amounts
which were deferred under any plans of the Company and its affiliated companies,
to the Executive by the Company and its affiliated companies in respect of the
three (3) fiscal years 

<PAGE>
 
immediately preceding the fiscal year in which the Effective Date occurs (the
"Recent Average Bonus"). Each such Annual Bonus shall be paid no later than
seventy-five (75) days after the end of the fiscal year for which the Annual
Bonus is awarded, unless the Executive shall elect to defer the receipt of such
Annual Bonus under any plan or arrangement of the Company allowing therefor.

          (c)  Incentive.  Savings and Retirement Plans.  During the Employment
Term, the Executive shall be entitled to participate in all incentive, savings
and retirement plans, practices, policies and programs applicable generally to
other peer executives of the Company and its affiliated companies, but in no
event shall such plans, practices, policies and programs provide the Executive
with incentive opportunities (measured with respect to both regular and special
incentive opportunities, to the extent, if any, that such distinction is
applicable), savings opportunities and retirement benefit opportunities, in each
case, less favorable, in the aggregate, than the most favorable of those
provided by the Company and its affiliated companies for the Executive under
such plans, practices, policies and programs as in effect at any time during the
twelve ( 12) month period immediately preceding the Effective Date, or, if more
favorable to the Executive, those provided generally at any time after the
Effective Date to other peer executives of the Company and its affiliated
companies.

          (d)  Benefit Plans.  During the Employment Term, the Executive and/or
the Executive's family, as the case may be, shall be eligible for participation
in and shall receive all benefits under benefit plans, practices, policies and
programs provided by the Company and its affiliated companies (including,
without limitation, medical, prescription drug, dental, disability, salary
continuance, employee life, group life, accidental death and travel accident
insurance plans and programs) to the extent applicable generally to other peer
executives of the Company and its affiliated companies and their families; but
in no event shall such plans, practices, policies and programs provide the
Executive with benefits which are less favorable, in the aggregate, than the
most favorable of such plans, practices, policies and programs in effect for the
Executive and his family at any time during the twelve (12) month period
immediately preceding the Effective Date or, if more favorable to the Executive,
those provided generally at any time after the Effective Date to other peer
executives of the Company and its affiliated companies and their families.

          (e)  Expenses.  During the Employment Term, the Executive shall be
entitled to receive prompt reimbursement for all reasonable expenses incurred by
the Executive in accordance with the most favorable policies, practices and
procedures of the Company and its affiliated companies in effect for the
Executive at any time during the twelve ( 12) month period immediately preceding
the Effective Date or, if more favorable to the Executive, as in effect
generally at any time thereafter with respect to other peer executives of the
Company and its affiliated companies.

          (f)  Fringe Benefits.  During the Employment Term, the Executive shall
be entitled to fringe benefits (including but not limited to Company cars, club
dues and physical examinations) in accordance with the most favorable plans,
practices, programs and policies of the Company and its affiliated companies in
effect for the Executive at any time during the twelve (12) month period
immediately preceding the Effective Date or, if more favorable to the 

<PAGE>
 
Executive, as in effect generally at any time thereafter with respect to other
peer executives of the Company and its affiliated companies.

          (g)  Vacation and Sick Leave.  During the Employment Term, the
Executive shall be entitled to paid vacation and sick leave (without loss of
pay) in accordance with the most favorable plans, policies, programs and
practices of the Company and its affiliated companies as in effect for the
Executive at any time during the twelve ( 12) month period immediately preceding
the Effective Date or, if more favorable to the Executive, as in effect
generally at any time thereafter with respect to other peer executives of the
Company and its affiliated companies.

          (h)  Restrictions.  As of the Effective Date, all restrictions 
limiting the exercise, transferability or other incidents of ownership of any
outstanding award, including but not limited to restricted stock, options, stock
appreciation rights, or other property or rights of the Company granted to the
Executive shall lapse, and such awards shall become fully vested and be held by
the Executive free and clear of all such restrictions. This provision shall
apply to all such property or rights notwithstanding the provisions of any other
plan or agreement, unless the effect of the application of this provision to a
particular right or property would result in such right or property failing to
qualify for favorable tax treatment under the particular section of the Internal
Revenue Code for which it was designed to qualify, or would result in the loss
of favorable securities law treatment for participants under the plan pursuant
to which the award was granted.

     5.  Termination of Employment.  During the Employment Term, the Executive's
employment hereunder may be terminated under the following circumstances:

          (a)  Death or Disability.  The Executive's employment shall terminate
automatically upon the Executive's death during the Employment Term.  If the
Company determines in good faith that the Disability of the Executive has
occurred during the Employment Term (pursuant to the definition of Disability
set forth below), it may give to the Executive written notice in accordance with
Section 5 of this Agreement of its intention to terminate the Executive's
employment.  In such event, the Executive's employment with the Company shall
terminate effective on the thirtieth (30th) day after receipt of such notice by
the Executive (the "Disability Effective Date"), provided that, within thirty
(30) days after such receipt, the Executive shall not have resumed to full-time
performance of the Executive's duties.  For purposes of this Agreement,
"Disability" shall mean the absence of the Executive from the Executive's duties
with the Company on a full-time basis for one hundred eighty ( 180) consecutive
business days as a result of incapacity due to mental or physical illness which
is determined to be total and permanent by a physician selected by the Company
or its insurers and acceptable to the Executive or the Executive's legal
representative, provided if the parties are unable to agree, the parties shall
request the Dean of the Medical College of Wisconsin to choose such physician.

          (b)  Cause.  The Company may terminate the Executive's employment for
"Cause." A termination for Cause is a termination evidenced by a resolution
adopted in good faith by a majority of the Board that the Executive (i)
willfully, deliberately and continually 
<PAGE>
 
failed to substantially perform his duties under Section 3, above (other than a
failure resulting from the Executive's incapacity due to physical or mental
illness) which failure constitutes gross misconduct, and results in and was
intended to result in demonstrable material injury to the Company, monetary or
otherwise, or (ii) committed acts of fraud and dishonesty constituting a felony,
as determined by a final judgment or order of a court of competent jurisdiction,
and resulting or intended to result in gain to or personal enrichment of the
Executive at the Company's expense, provided, however, that no termination of
the Executive's employment shall be for Cause as set forth in (i), above, until
(a) Executive shall have had at least sixty (60) days to cure any conduct or act
alleged to provide Cause for termination after a written notice of demand has
been delivered to the Executive specifying in detail the manner in which the
Executive's conduct violates this Agreement, and (b) the Executive shall have
been provided an opportunity to be heard by the Board (with the assistance of
the Executive's counsel if the Executive so desires). No act, or failure to act,
on the Executive's part, shall be considered "willful" unless he has acted or
failed to act in bad faith and without a reasonable belief that his action or
failure to act was in the best interest of the Company. Notwithstanding anything
contained in this Agreement to the contrary, no failure to perform by the
Executive after Notice of Termination is given by the Executive shall constitute
Cause for purposes of this Agreement.

          (c)  Good Reason.

          (1)  The Executive may terminate his employment for Good Reason.  For
purposes of this Agreement, "Good Reason" shall mean the occurrence after a
Change of Control of any of the events or conditions described in Subsections
(i) through (vi) hereof:

          (i)  A change in the Executive's status, title, position or
responsibilities (including reporting responsibilities) which, in the
Executive's reasonable judgment, does not represent a promotion from his status,
title, position or responsibilities as in effect immediately prior thereto; the
assignment to the Executive of any duties or responsibilities which, in the
Executive's reasonable judgment, are inconsistent with his status, title,
position or responsibilities in effect immediately prior to such assignment; or
any removal of the Executive from or failure to reappoint or reelect him to any
position, except in connection with the termination of his employment for
Disability, Cause, as a result of his death or by the Executive other than for
Good Reason;

          (ii)  Any failure by the Company to comply with any of the provisions
of Section 4 of this Agreement.

          (iii)  The insolvency or the filing (by any party, including the
Company) of a petition for bankruptcy of the Company;

          (iv)  Any material breach by the Company of any provision of this
Agreement;

          (v)  Any purported termination of the Executive's employment for Cause
by the Company which does not comply with the terms of Section 5 of this
Agreement; and

<PAGE>
 
          (vi)  The failure of the Company to obtain an agreement, satisfactory
to the Executive, from any successor or assign of the Company, to assume and
agree to perform this Agreement, as contemplated in Section I O hereof.

          (2)  Any event or condition described in Section 5(c) ( I ) which
occurs prior to the Effective Date but which the Executive reasonably
demonstrates (i) was at the request of a third party who has indicated an
intention or taken steps reasonably calculated to effect a Change of Control, or
(ii) otherwise arose in connection with or in anticipation of a Change of
Control, shall constitute Good Reason for purposes of this Agreement
notwithstanding that it occurred prior to the Effective Date.

          (3)  The Executive's right to terminate his employment pursuant to
this Section 5(c) shall not be affected by his incapacity due to physical or
mental illness.  The Executive's continued employment or failure to give Notice
of Termination shall not constitute consent to, or a waiver of rights with
respect to, any circumstances constituting Good Reason hereunder.

          (4)  For purposes of this Section 5(c), any good faith determination
of Good Reason made by the Executive shall be conclusive.

          (d)  Voluntary Termination.  The Executive may voluntarily terminate
his employment hereunder at any time.

          (e)  Notice of Termination.  Any purported termination by the Company
or by the Executive (other than by death of the Executive) shall be communicated
by Notice of Termination to the other.  For purposes of this Agreement, a
"Notice of Termination" shall mean a written notice which (i) indicates the
specific termination provision in this Agreement relied upon, (ii) to the extent
applicable, sets forth in reasonable detail the facts and circumstances claimed
to provide a basis for termination of the Executive's employment under the
provision so indicated, and (iii) the Termination Date.  For purposes of this
Agreement, no such purported termination of employment shall be effective
without such Notice of Termination.

          (f)  Termination Date, Etc.  "Termination Date" shall mean in the case
of the Executive's death, his date of death, or in all other cases, the date
specified in the Notice of Termination subject to the following:

          (1)  If the Executive's employment is terminated by the Company, the
date specified in the Notice of Termination shall be at least thirty (30) days
after the date the Notice of Termination is given to the Executive, provided,
however, that in the case of Disability, the Executive shall not have returned
to the full-time performance of his duties during such period of at least thirty
(30) days;

          (2)  If the Executive's employment is terminated for Good Reason, the
date specified in the Notice of Termination shall not be more than sixty (60)
days after the date the Notice of Termination is given to the Company; and
<PAGE>
 
          (3)  In the event that within thirty (30) days following the date of
receipt of the Notice of Termination, one party notifies the other that a
dispute exists concerning the basis for termination, the Executive's employment
hereunder shall not be terminated except after the dispute is finally resolved
and a Termination Date is determined either by a mutual written agreement of the
parties, or by a binding and final judgment order or decree of a court of
competent jurisdiction (the time for appeal therefrom having expired and no
appeal having been perfected).

     6.  Obligations of the Company Upon Termination.

          (a)  Good Reason; Other Than for Cause, Death or Disability.  If,
during the Employment Term, the Company shall terminate the Executive's
employment other than for Cause or Disability or the Executive shall terminate
employment for Good Reason:

          (i)  The Company shall pay to the Executive in a lump sum in cash
within five (5) days after the Termination Date the aggregate of the following
amounts:

          A.  The sum of:

          (1)  The Executive's Annual Base Salary through the Termination Date
to the extent not theretofore paid.

          (2)  The product of (x) the higher of (1) the Recent Average Bonus and
(11) the Annual Bonus paid or payable, including any amount deferred, (and
annualized for any fiscal year consisting of less than twelve ( 12) full months
or for which the Executive has been employed for less than twelve ( 12) full
months) for the most recently completed fiscal year during the Employment
Period, if any (such higher amount being referred to as the "Highest Annual
Bonus") and (y) a fraction, the numerator of which is the number of days
completed in the current fiscal year through the Termination Date, and the
denominator of which is 365; and

          (3)  Any compensation previously deferred by the Executive (together
with any accrued interest or earnings thereon) and any accrued vacation pay, in
each case to the extent not theretofore paid.

     The sum of the amounts described in Clauses ( I ), (2) and (3 ) shall be
hereinafter referred to as the "Accrued Obligations."

          B.  The amount equal to the product of (1) two and (2) the sum of (x)
the Executive's Annual Base Salary (increased for this purpose by any Section
401(k) deferrals, cafeteria plan elections, or other deferrals that would have
increased Executive's Annual Base Salary if paid in cash to Executive when
earned) and (y)the Executive's Highest Annual Bonus;

          C.  A separate lump-sum supplemental retirement benefit equal to the
difference between ( I ) the actuarial equivalent (utilizing for this purpose
the most favorable to the Executive actuarial assumptions and Company
contribution history with respect to the applicable 

<PAGE>
 
retirement plan, incentive plans, savings plans and other plans described in
Section 4(c) (or any successor plan thereto) (the "Retirement Plans") during the
twelve (12) month period immediately preceding the Effective Date) of the
benefit payable under the Retirement Plans and any supplemental and/or excess
retirement plan providing benefits for the Executive (the "SERP") which the
Executive would receive if the Executive's employment continued for an
additional two (2) years after the Termination Date with annual compensation
equal to the sum of the Annual Base Salary and Highest Annual Bonus, assuming
for this purpose that all accrued benefits and contributions are fully vested
and that benefit accrual formulas and Company contributions are no less
advantageous to the Executive than those in effect during the twelve (12) month
period immediately preceding the Effective Date, and (2) the actuarial
equivalent (utilizing for this purpose the actuarial assumptions utilized with
respect to the Retirement Plans during the twelve (12) month period immediately
preceding the Effective Date) of the Executive's actual benefit (paid or
payable), if any, under the Retirement Plans and the SERP. For example, if there
were a termination today this supplemental retirement benefit would be
interpreted with respect to two plans m existence today as follows: (i) with
respect to the Retirement Growth Plan of the Company, the Executive would
receive no less than two times eight percent (8%) of the maximum compensation
that can be taken into account under the Plan assuming Executive's compensation
is as set forth above, and (ii) with respect to the Incentive Savings Plan of
the Company, the Executive would receive no less than two times an annual
Company match of fifty percent (50%) of Employee's maximum allowable
contribution to the Plan assuming Executive's compensation is as set forth
above; D. The amount equal to the product of (i) two and (ii) the sum of (x) the
imputed income reflected on Executive's W-2 attributable to the car provided to
Executive by the Company or its affiliates for the last calendar year ending
before the Effective Date and (y) the club dues for Executive paid by the
Company or its affiliates attributable to such year.

          (ii)  For twenty-four (24) months after the Termination Date, or such
longer period as any plan, program, practice or policy may provide, the Company
shall continue benefits to the Executive and/or the Executive's family at least
equal to those which would have been provided to them in accordance with the
plans, programs, practices and policies described in Section 4(d) of this
Agreement if the Executive's employment had not been terminated in accordance
with the most favorable plans, practices, programs or policies of the Company
and its affiliated companies applicable generally to other peer executives and
their families during the twelve ( 12) month period immediately preceding the
Effective Date or, if more favorable to the Executive, as in effect generally at
any time thereafter with respect to other peer executives of the Company and its
affiliated companies and their families; provided, however, that if the
Executive becomes reemployed with another employer and is eligible to receive
medical or other benefits under another employer provided plan, the medical and
other benefits described herein shall be secondary to those provided under such
other plan during such applicable period of eligibility, provided that the
aggregate coverage of the combined benefit plans is no less favorable to the
Executive, in terms of amounts and deductibles and costs to him, than the
coverage required hereunder.  For purposes of determining eligibility of the
Executive for retiree benefits pursuant to such plans, practices, programs and
policies, the Executive shall be considered to have remained employed until the
end of such twenty-four (24) month period and to have retired on the last day of
such period.
<PAGE>
 
          (iii)  The Executive shall have the right to purchase the car provided
to him by the Company or its affiliates during the twelve (12) month period
immediately preceding the Effective Date (or a comparable car acceptable to the
Executive if such car is no longer owned by the Company or its affiliates), at
the book value thereof on the Termination Date, exercisable within thirty (30)
days after the Termination Date; and if the car is not purchased, Executive
shall return the car to the Company.

          (iv)  To the extent not theretofore paid or provided, the Company
shall timely pay or provide to the Executive any other amounts or benefits
required to be paid or provided or which the Executive is eligible to receive
pursuant to this Agreement under any plan, program, policy or practice or
contract or agreement of the Company and its affiliated companies (such other
amounts and benefits shall be hereinafter referred to as the "Other Benefits").

          (b)  Death.  If the Executive's employment is terminated by reason of
the Executive's death during the Employment Term, this Agreement shall terminate
without further obligations to the Executive's legal representatives under this
Agreement, except that the Company shall pay or provide the Accrued Obligations,
six (6) months of Annual Base Salary, and the Other Benefits.  The Accrued
Obligations shall be paid to the Executive's estate or beneficiary, as
applicable, in a lump sum in cash within thirty (30) days of the Termination
Date.  The six (6) months of Annual Base Salary shall be paid during the six (6)
month period following the Termination Date on a monthly basis.  With respect to
the provision of Other Benefits, the term Other Benefits as utilized in this
Section 6(b) shall include, and the Executive's family shall be entitled to
receive, benefits at least equal to the most favorable benefits provided by the
Company and any of its affiliated companies to surviving families of peer
executives of the Company and such affiliated companies under such plans,
programs, practices and policies relating to family death benefits, if any, as
in effect with respect to other peer executives and their families at any time
during the twelve ( 12) month period immediately preceding the Effective Date
or, if more favorable to the Executive and/or the Executive's family, as in
effect on the date of the Executive's death with respect to other peer
executives of the Company and its affiliated companies and their families.

          (c)  Disability.  If the Executive's employment is terminated by
reason of the Executive's Disability during the Employment Term, this Agreement
shall terminate without further obligations to the Executive, except that the
Company shall pay or provide the Accrued Obligations and the Other Benefits.
The Accrued Obligations shall be paid to the Executive in a lump sum in cash
within thirty (30) days of the Termination Date.  With respect to the provision
of Other Benefits, the term Other Benefits as utilized in this Section 6(c)
shall include, and the Executive shall be entitled after the Disability
Effective Date to receive, disability and other benefits at least equal to the
most favorable of those generally provided by the Company and its affiliated
companies to disabled executives and/or their families in accordance with such
plans, programs, practices and policies relating to disability, if any, as in
effect generally with respect to other peer executives and their families at any
time during the twelve (12) month period immediately preceding the Effective
Date or, if more favorable to the Executive and/or the 

<PAGE>
 
Executive's family, as in effect at any time thereafter generally with respect
to other peer executives of the Company and its affiliated companies and their
families.

          (d)  Cause; Other Than for Good Reason.  If the Executive's employment
shall be terminated for Cause during the Employment Term, or if the Executive
voluntarily terminates employment during the Employment Term for other than Good
Reason, this Agreement shall terminate without further obligations to the
Executive other than the obligation to pay to the Executive Annual Base Salary
through the Date of Termination, any other amounts earned or accrued through the
Termination Date, and the amount of any compensation previously deferred by the
Executive, in each case to the extent theretofore unpaid; provided that if
Executive voluntarily terminates Executive shall receive the benefits normally
provided upon normal or early retirement with respect to other peer Executives
and their families to the extent he qualifies therefore.  All salary or
compensation hereunder shall be paid to the Executive in a lump sum in cash
within thirty (30) days of the Date of Termination.

          (e)  If any of the payments referred to in this Section 6 are not paid
within the time specified after the Termination Date (hereinafter a "Delinquent
Payment"), in addition to such principal sum, the Company will pay to the
Executive interest on all such Delinquent Payments computed at the prime rate as
announced from time to time by M&I Marshall 8L Ilsley Bank, or its successor,
compounded monthly.

     7.  No Mitigation.  In no event shall the Executive be obligated to seek
other employment to take any other action by way of mitigation of the amounts
payable to the Executive under any of the provisions of this Agreement and such
amounts shall not be reduced (except to the extent set forth in Section
6(a)(ii)) whether or not the Executive obtains other employment.

     8.  Unauthorized Disclosure.  The Executive shall not make any Unauthorized
Disclosure.  For purposes of this Agreement, "Unauthorized Disclosure" shall
mean disclosure by the Executive without the consent of the Board to any person,
other than an employee of the Company or a person to whom disclosure is
reasonably necessary or appropriate in connection with the performance by the
Executive of his duties as an executive of the Company or as may be legally
required, of any confidential information obtained by the Executive while in the
employ of the Company (including, but not limited to, any confidential
information with respect to any of the Company's customers or methods of
operation) the disclosure of which he knows or has reason to believe will be
materially injurious to the Company; provided, however, that such term shall not
include the use or disclosure by the Executive, without consent, of any
information known generally to the public (other than as a result of disclosure
by him in violation of this Section 8) or any information not otherwise
considered confidential by a reasonable person engaged in the same business as
that conducted by the Company.  In no event shall an asserted violation of this
Section 8 constitute a basis for deferring or withholding any amounts otherwise
payable to the Executive under this Agreement.

<PAGE>
 
     9.  Successors and Assigns.

         (a)  This Agreement shall be binding upon and shall inure to the
benefit of the Company, its successors and assigns and the company shall require
any successor or assign (whether direct or indirect, by purchase, merger,
consolidation or otherwise) to expressly assume and agree to perform this
Agreement in the same manner and to the same extent that the Company would be
required to perform if no such succession or assignment had taken place.  The
term "Company" as used herein shall include such successors and assigns.  The
term "successors and assigns" as used herein shall mean a corporation or other
entity acquiring all or substantially all the assets and business of the Company
(including this Agreement) whether by operation of law or otherwise.

          (b)  Neither this Agreement nor any right or interest hereunder shall
be assignable or transferable by the Executive, his beneficiaries or legal
representatives, except by will or by the laws of descent and distribution.
This Agreement shall inure to the benefit of and be enforceable by the
Executive's legal representative.

     10.  Fees and Expenses.  From and after the Effective Date, the Company
shall pay all legal fees and related expenses (including the costs of experts,
evidence and counsel) reasonably incurred by the Executive as they become due as
a result of (i) the Executive's termination of employment (including all such
fees and expenses, if any, incurred in contesting or disputing any such
termination of employment), (ii) the Executive's hearing before the Board as
contemplated in Section 5(b) of this Agreement or (iii) the Executive's seeking
to obtain or enforce any right or benefit provided by this Agreement or by any
other plan or arrangement maintained by the Company under which the Executive is
or may be entitled to receive benefits.

     11.  Notice.  For the purposes of this Agreement, notices and all other
communications provided for in the Agreement (including the Notice of
Termination) shall be in writing and shall be deemed to have been duly given
when personally delivered or sent by certified mail, return receipt requested,
postage prepaid, if to the Company, to Marshall & Ilsley Corporation, 770 North
Water Street, Milwaukee, Wisconsin 53202, or if to Executive, to the address set
forth below Executive's signature, or to such other address as the party may be
notified, provided that all notices to the Company shall be directed to the
attention of the Board with a copy to the Secretary of the Company.  All notices
and communications shall be deemed to have been received on the date of delivery
thereof or on the third business day after the mailing thereof, except that
notice of change of address shall be effective only upon receipt.

     12.  Non-Exclusivity of Rights.  Nothing in this Agreement shall prevent or
limit the Executive's continuing or future participation in any benefit, bonus,
incentive or other plan or program provided by the Company or any of its
subsidiaries for which the Executive may qualify.  Amounts which are vested
benefits or which the Executive is otherwise entitled to receive under any plan
or program of the Company or any of its subsidiaries shall be payable in
accordance with such plan or program, except as explicitly modified by this
Agreement.

<PAGE>
 
     13.  Settlement of Claims.  The Company's obligation to make the payments
provided for in this Agreement and otherwise to perform its obligations
hereunder shall not be affected by any circumstances, including, without
limitation, any set-off, counterclaim, recoupment, defense or other right which
the Company may have against the Executive or others.

     14.  Miscellaneous.  No provision of this Agreement may be modified, waived
or discharged unless such waiver, modification or discharge is agreed to in
writing and signed by the Executive and the Company.  No waiver by either party
hereto at any time of any breach by the other party hereto of, or compliance
with, any condition or provision of this Agreement to be performed by such other
party shall be deemed a waiver of similar or dissimilar provisions or conditions
at the same or at any prior or subsequent time.  No agreement or
representations, oral or otherwise, express or implied, with respect to the
subject matter hereof have been made by either party which are not expressly set
forth in this Agreement.

     15.  Employment.  The Executive and the Company acknowledge that the
employment of the Executive by the Company is "at will" and prior to the
Effective Date, may be terminated by either the Executive or the Company at any
time.  Moreover, if prior to the Effective Date, the Executive's employment with
the Company terminates then the Executive shall have no further rights under
this Agreement.

     16.  Governing Law.  This Agreement shall be governed by and construed and
enforced in accordance with the laws of the State of Wisconsin without giving
effect to the conflict of law principles thereof.

     17.  Severability.  The provisions of this Agreement shall be deemed
severable and the invalidity or unenforceability of any provision shall not
affect the validity or enforceability of the other provisions hereof.

     18.  Entire Agreement.  This Agreement constitutes the entire agreement
between the parties hereto and supersedes all prior agreements, if any,
understandings and arrangements, oral or written, between the parties hereto
with respect to the subject matter hereof.

     19.  Headings.  The headings herein contained are for reference only and
shall not affect the meaning or interpretation of any provision of this
Agreement.

     20.  Modification.  No provision of this Agreement may be modified, waived
or discharged unless such modification, waiver or discharge is agreed to in
writing signed by both the Executive and the Company.

     21.  Withholding.  The Company shall be entitled to withhold from amounts
paid to the Executive hereunder any federal, estate or local withholding or
other taxes or charges which it is, from time to time, required to withhold.
The Company shall be entitled to rely on an opinion of counsel if any question
as to the amount or requirement of any such withholding shall arise.

<PAGE>
 
     22.  Limitation on Payments.

          (a)  Within fifteen (15) business days of the Termination Date, an
independent national accounting hum designated by the Company (the "Accounting
Firm") shall compute whether there would be any "excess parachute payments"
payable to the Executive, within the meaning of Section 280G of the Internal
Revenue Code of 1986, as amended (the "Code"), taking into account the total
"parachute payments," within the meaning of Section 280G of the Code, payable to
the Executive by the Company or any successor thereto under this Agreement and
any other plan, agreement or otherwise.  If there would be any excess parachute
payments, the Accounting Firm will compute the net after-tax proceeds to the
Executive, taking into account the excise tax imposed by Section 4999 of the
Code, if (i) the payments hereunder were reduced, but not below zero, such that
the total parachute payments payable to the Executive would not exceed 299% of
the "base amount" as defined in Section 280G of the Code, or (ii) the payments
hereunder were not reduced.  If reducing the payments hereunder would result in
a greater after-tax amount to the Executive, such lesser amount shall be paid to
the Executive.  If not reducing the payments hereunder would result in a greater
after-tax amount to the Executive, such payments shall not be reduced.  The
determination by the Accounting Firm shall be binding upon the Company and the
Executive subject to the application of Section 22(b) hereof.

          (b)  As a result of the uncertainty m the application of Sections 280G
of the Code, it is possible that excess parachute payments will be paid when
such payment would result in a lesser after-tax amount to the Executive; this is
not the intent hereof.  In such cases, the payment of any excess parachute
payments will be void ab initio as regards any such excess.  Any excess will be
treated as a loan by the Company to the Executive.  The Executive will return
the excess to the Company, within fifteen (I 5) business days of any
determination by the Accounting Firm that excess parachute payments have been
paid when not so intended, with interest at an annual rate equal to the rate
provided in Section 1274(b)(2)(B) of the Code (or 120% of such rate if the
Accounting Firm determines that such rate is necessary to avoid an excise tax
under Section 4999 of the Code) from the date the Executive received the excess
until it is repaid to the Company.

          (c)  All fees, costs and expenses (including, but not limited to, the
cost of retaining experts) of the Accounting Firm shall be borne by the Company
and the Company shall pay such fees, costs and expenses as they become due. In
performing the computations required hereunder, the Accounting Firm shall assume
that taxes will be paid for state and federal purposes at the highest possible
marginal tax rates which could be applicable to the Executive in the yeah of
receipt of the payments, unless the Executive agrees otherwise."
<PAGE>
 
     IN WITNESS WHEREOF, the Company has caused this Agreement to be executed by
its duly authorized officer and the Executive has executed this Agreement as of
the day and year first above written.

                                    MARSHALL & ILSLEY CORPORATION


                                    By:___________________________
                                    James B. Wigdale, Chairman
ATTEST:


________________________________ 
Michael A. Hatfield, Secretary
                                    EXECUTIVE:


                                    ____________________________________
                                    Signature

                                    Address:____________________________

                                            ____________________________

<PAGE>
 
                                                                      Exhibit 12
 
                         Marshall & Ilsley Corporation
               Computation of Ratio of Earnings to Fixed Charges
                                    ($000's)
 
<TABLE>
<CAPTION>
                                                               Years Ended December 31,
                                                   ----------------------------------------------------
                                                      1998        1997       1996      1995      1994
                                                   ----------  ----------  --------  --------  --------
<S>                                                <C>         <C>         <C>       <C>       <C>
Earnings:
Earnings before income taxes and extraordinary
 items...........................................  $  465,285  $  388,172  $317,949  $312,938  $179,762
Fixed charges, excluding interest on deposits....     206,546     175,609   126,261   119,412    85,767
                                                   ----------  ----------  --------  --------  --------
Earnings including fixed charges but excluding
 interest on deposits............................     671,831     563,781   444,210   432,350   265,529
Interest on deposits.............................     564,540     460,418   392,473   363,488   274,211
                                                   ----------  ----------  --------  --------  --------
Earnings including fixed charges and interest on
 deposits........................................  $1,236,371  $1,024,199  $836,683  $795,838  $539,740
                                                   ==========  ==========  ========  ========  ========
Fixed Charges:
Interest Expense:
  Short-term borrowings..........................  $  126,624  $  111,193  $ 63,892  $ 48,390  $ 39,978
  Long-term borrowings...........................      66,810      54,175    53,615    63,701    38,870
  One-third of rental expense for all operating
  leases (the amount deemed representative
  of the interest factor)........................      13,112      10,241     8,754     7,321     6,919
                                                   ----------  ----------  --------  --------  --------
Fixed charges excluding interest on deposits.....     206,546     175,609   126,261   119,412    85,767
Interest on deposits.............................     564,540     460,418   392,473   363,488   274,211
                                                   ----------  ----------  --------  --------  --------
Fixed charges including interest on deposits.....  $  771,086  $  636,027  $518,734  $482,900  $359,978
                                                   ==========  ==========  ========  ========  ========
Ratio of Earnings to Fixed Charges:
Excluding interest on deposits...................        3.25x       3.21x     3.52x     3.62x     3.10x
Including interest on deposits...................        1.60x       1.61x     1.61x     1.65x     1.50x
</TABLE>


<PAGE>
 
                                                                      Exhibit 21

                         MARSHALL & ILSLEY CORPORATION

                                  SUBSIDIARIES

                               February 26, 1999

Subsidiaries Organized in Wisconsin
- -----------------------------------

M&I Bank (Ashland)
M&I Bank (Superior)
M&I Bank of Burlington
M&I Bank of Eagle River
M&I Bank of LaCrosse
M&I Bank of Mayville
M&I Bank of Menomonee Falls
M&I Bank of Racine
M&I Bank of Shawano
M&I Bank of Southern Wisconsin
M&I Bank Fox Valley
M&I Bank Northeast
M&I Bank South
M&I Bank South Central
M&I Central Bank & Trust
M&I Central State Bank
M&I Citizens American Bank
M&I Community State Bank
M&I First American Bank
M&I Lake Country Bank
M&I Lakeview Bank
M&I Marshall & Ilsley Bank
M&I Merchants Bank
M&I Mid-State Bank
M&I Northern Bank
M&I Brokerage Services, Inc.
M&I Building Corp.
M&I Capital Markets Group L.L.C.
M&I Dealer Finance, Inc.
M&I Financial Corp.
M&I First National Leasing Corp.
M&I Home Equity Corp.
M&I Investment Management Corp.
M&I Mortgage Corp.
M&I Support Services Corp.
Loujo Company
Marshall & Ilsley Trust Company
Richter-Schroeder Company, Inc.
The 780 North Corp.

Subsidiaries Incorporated in Arizona
- ------------------------------------

M&I Thunderbird Bank
M&I Insurance Company of Arizona, Inc.
M&I Marshall & Ilsley Trust Company of Arizona
Community Life Insurance Company

Subsidiaries Organized in Delaware
- ----------------------------------

M&I Ventures L.L.C.

Subsidiaries Incorporated in Florida
- ------------------------------------

Marshall & Ilsley Trust Company of Florida

Subsidiaries Incorporated in Massachusetts
- ------------------------------------------

M&I New England, Inc.

Subsidiaries Incorporated in Michigan
- -------------------------------------

M&I Leasing Corp. of Michigan

Subsidiaries Incorporated in Minnesota
- --------------------------------------

M&I Home Equity Corp. of Minnesota

Subsidiaries Incorporated in Nevada
- -----------------------------------

     The registrant has 87 subsidiaries which primarily hold, manage and service
investment and mortgage portfolios.

Subsidiaries Incorporated in New Hampshire
- ------------------------------------------
 
M&I EastPoint Technology, Inc.
 
Subsidiaries Incorporated in Malaysia
- -------------------------------------
 
M&I Asia Pacific Sdn. Bhd.
 
Subsidiaries Organized Under the Laws of the United States
- ----------------------------------------------------------
 
M&I Bank FSB
M&I First National Bank (West Bend)
M&I National Trust Company

<PAGE>
 
                                                                      Exhibit 23

                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
                   -----------------------------------------


As independent public accountants, we hereby consent to the inclusion in this
Form 10-K for the year ended December 31, 1998, of our report dated January 29,
1999.  It should be noted that we have not audited any financial statements of
Marshall & Ilsley Corporation and subsidiaries subsequent to December 31, 1998,
or performed any audit procedures subsequent to the date of our report.

We also consent to the incorporation by reference of such report in the
following Registration Statements of Marshall & Ilsley Corporation ("M&I"):

     No. 2-89605 (Form S-8) pertaining to the M&I 1983 Executive Stock Option
          and Restricted Stock Plan,
     No. 33-2642 (Form S-8) pertaining to the M&I 1985 Executive Stock Option
          and Restricted Stock Plan,
     No. 33-3415 (Form S-8) pertaining to the M&I Retirement Growth Plan,
     No. 33-33090 (Form S-8) pertaining to the M&I 1988 Restricted Stock Plan,
     No. 33-33153 (Form S-8) pertaining to the M&I 1989 Executive Stock Option
          and Restricted Stock Plan,
     No. 33-53155 (Form S-8) pertaining to the M&I 1993 Executive Stock Option
          Plan,
     No. 33-53897 (Form S-8) pertaining to the stock option plans of Valley
          Bancorporation assumed by M&I,
     No. 33-55317 (Form S-8) pertaining to the M&I 1994 Long-Term Incentive Plan
          for Executives,
     No. 33-58787 (Form S-8) pertaining to the M&I 1995 Directors Stock Option
          Plan,
     No. 333-02017 (Form S-8) pertaining to the M&I 1986 Non-qualified Stock
          Option Plan,
     No. 333-36909 (Form S-8) pertaining to the M&I 1997 Executive Stock Option
          and Restricted Stock Plan and to the Security Capital Corporation 1993
          Incentive Stock Option Plan assumed by M&I,
     No. 333-49195 (Form S-8) pertaining to the M&I Amended and Restated 1994
          Long-Term Incentive Plan for Executives, the M&I Amended and Restated
          Directors Deferred Compensation Plan and to the stock option plans of
          Advantage Bancorp, Inc. assumed by M&I,
     No. 2-80293 (Form S-3) pertaining to shares of M&I held by those persons
          named in such Registration Statement,
     No. 33-21377 (Form S-3) pertaining to the issuance by M&I of Debt
          Securities,
     No. 33-64054 (Form S-3) pertaining to the issuance by M&I of Debt
          Securities, and
     No. 33-64425 (Form S-3) pertaining to the issuance by M&I of Debt
          Securities.



Milwaukee, Wisconsin,                             ARTHUR ANDERSEN LLP
March 5, 1999

<PAGE>
                                                                      Exhibit 24

                          DIRECTOR'S POWER OF ATTORNEY
                                (1998 Form 10-K)


     The undersigned director of Marshall & Ilsley Corporation designates each
of J.B. Wigdale and M.A. Hatfield, with the power of substitution, as his true
and lawful attorney-in-fact for the purpose of:  (i) executing in his name and
on his behalf Marshall & Ilsley Corporation's Form 10-K for the fiscal year
ended December 31, 1998 and any related amendments and/or supplements; (ii)
generally doing all things in his name and on his behalf in his capacity as a
director to enable Marshall & Ilsley Corporation to comply with the provisions
of the Securities Exchange Act of 1934, as amended, and all requirements of the
Securities and Exchange Commission; and (iii) ratifying and confirming his
signature as it may be signed by the attorney-in-fact to the Form 10-K and any
related amendments and/or supplements.

     Dated this 11th day of February, 1999.



                              /s/ Glenn A. Francke
                              --------------------
                              Glenn A. Francke
<PAGE>
 
                          DIRECTOR'S POWER OF ATTORNEY
                                (1998 Form 10-K)


     The undersigned director of Marshall & Ilsley Corporation designates each
of J.B. Wigdale and M.A. Hatfield, with the power of substitution, as his true
and lawful attorney-in-fact for the purpose of:  (i) executing in his name and
on his behalf Marshall & Ilsley Corporation's Form 10-K for the fiscal year
ended December 31, 1998 and any related amendments and/or supplements; (ii)
generally doing all things in his name and on his behalf in his capacity as a
director to enable Marshall & Ilsley Corporation to comply with the provisions
of the Securities Exchange Act of 1934, as amended, and all requirements of the
Securities and Exchange Commission; and (iii) ratifying and confirming his
signature as it may be signed by the attorney-in-fact to the Form 10-K and any
related amendments and/or supplements.

     Dated this 11th day of February, 1999.



                              /s/ James O. Wright
                              -------------------
                              James O. Wright
<PAGE>
 
                          DIRECTOR'S POWER OF ATTORNEY
                                (1998 Form 10-K)


     The undersigned director of Marshall & Ilsley Corporation designates each
of J.B. Wigdale and M.A. Hatfield, with the power of substitution, as his true
and lawful attorney-in-fact for the purpose of:  (i) executing in his name and
on his behalf Marshall & Ilsley Corporation's Form 10-K for the fiscal year
ended December 31, 1998 and any related amendments and/or supplements; (ii)
generally doing all things in his name and on his behalf in his capacity as a
director to enable Marshall & Ilsley Corporation to comply with the provisions
of the Securities Exchange Act of 1934, as amended, and all requirements of the
Securities and Exchange Commission; and (iii) ratifying and confirming his
signature as it may be signed by the attorney-in-fact to the Form 10-K and any
related amendments and/or supplements.

     Dated this 11th day of February, 1999.



                              /s/ Wendell F. Bueche
                              ---------------------
                              Wendell F. Bueche
<PAGE>
 
                          DIRECTOR'S POWER OF ATTORNEY
                                (1998 Form 10-K)


     The undersigned director of Marshall & Ilsley Corporation designates each
of J.B. Wigdale and M.A. Hatfield, with the power of substitution, as his true
and lawful attorney-in-fact for the purpose of:  (i) executing in his name and
on his behalf Marshall & Ilsley Corporation's Form 10-K for the fiscal year
ended December 31, 1998 and any related amendments and/or supplements; (ii)
generally doing all things in his name and on his behalf in his capacity as a
director to enable Marshall & Ilsley Corporation to comply with the provisions
of the Securities Exchange Act of 1934, as amended, and all requirements of the
Securities and Exchange Commission; and (iii) ratifying and confirming his
signature as it may be signed by the attorney-in-fact to the Form 10-K and any
related amendments and/or supplements.

     Dated this 11th day of February, 1999.



                              /s/ Robert A. Schaefer
                              ----------------------
                              Robert A. Schaefer
<PAGE>
  
                          DIRECTOR'S POWER OF ATTORNEY
                                (1998 Form 10-K)


     The undersigned director of Marshall & Ilsley Corporation designates each
of J.B. Wigdale and M.A. Hatfield, with the power of substitution, as his true
and lawful attorney-in-fact for the purpose of:  (i) executing in his name and
on his behalf Marshall & Ilsley Corporation's Form 10-K for the fiscal year
ended December 31, 1998 and any related amendments and/or supplements; (ii)
generally doing all things in his name and on his behalf in his capacity as a
director to enable Marshall & Ilsley Corporation to comply with the provisions
of the Securities Exchange Act of 1934, as amended, and all requirements of the
Securities and Exchange Commission; and (iii) ratifying and confirming his
signature as it may be signed by the attorney-in-fact to the Form 10-K and any
related amendments and/or supplements.

     Dated this 12th day of February, 1999.



                              /s/ Jack F. Kellner
                              -------------------
                              Jack F. Kellner

<PAGE>
 
                          DIRECTOR'S POWER OF ATTORNEY
                                (1998 Form 10-K)


     The undersigned director of Marshall & Ilsley Corporation designates each
of J.B. Wigdale and M.A. Hatfield, with the power of substitution, as his true
and lawful attorney-in-fact for the purpose of:  (i) executing in his name and
on his behalf Marshall & Ilsley Corporation's Form 10-K for the fiscal year
ended December 31, 1998 and any related amendments and/or supplements; (ii)
generally doing all things in his name and on his behalf in his capacity as a
director to enable Marshall & Ilsley Corporation to comply with the provisions
of the Securities Exchange Act of 1934, as amended, and all requirements of the
Securities and Exchange Commission; and (iii) ratifying and confirming his
signature as it may be signed by the attorney-in-fact to the Form 10-K and any
related amendments and/or supplements.

     Dated this 11th day of February, 1999.



                              /s/ D.J. Kuester
                              ----------------
                              D.J. Kuester

<PAGE>
 
                          DIRECTOR'S POWER OF ATTORNEY
                                (1998 Form 10-K)


     The undersigned director of Marshall & Ilsley Corporation designates each
of J.B. Wigdale and M.A. Hatfield, with the power of substitution, as his true
and lawful attorney-in-fact for the purpose of:  (i) executing in his name and
on his behalf Marshall & Ilsley Corporation's Form 10-K for the fiscal year
ended December 31, 1998 and any related amendments and/or supplements; (ii)
generally doing all things in his name and on his behalf in his capacity as a
director to enable Marshall & Ilsley Corporation to comply with the provisions
of the Securities Exchange Act of 1934, as amended, and all requirements of the
Securities and Exchange Commission; and (iii) ratifying and confirming his
signature as it may be signed by the attorney-in-fact to the Form 10-K and any
related amendments and/or supplements.

     Dated this 11th day of February, 1999.



                              /s/ Oscar C. Boldt
                              ------------------
                              Oscar C. Boldt

<PAGE>
 
                          DIRECTOR'S POWER OF ATTORNEY
                                (1998 Form 10-K)


     The undersigned director of Marshall & Ilsley Corporation designates each
of J.B. Wigdale and M.A. Hatfield, with the power of substitution, as his true
and lawful attorney-in-fact for the purpose of:  (i) executing in his name and
on his behalf Marshall & Ilsley Corporation's Form 10-K for the fiscal year
ended December 31, 1998 and any related amendments and/or supplements; (ii)
generally doing all things in his name and on his behalf in his capacity as a
director to enable Marshall & Ilsley Corporation to comply with the provisions
of the Securities Exchange Act of 1934, as amended, and all requirements of the
Securities and Exchange Commission; and (iii) ratifying and confirming his
signature as it may be signed by the attorney-in-fact to the Form 10-K and any
related amendments and/or supplements.

     Dated this 11th day of February, 1999.



                              /s/ G.H. Gunnlaugsson
                              ---------------------
                              G.H. Gunnlaugsson

<PAGE>
 
                          DIRECTOR'S POWER OF ATTORNEY
                                (1998 Form 10-K)


     The undersigned director of Marshall & Ilsley Corporation designates each
of J.B. Wigdale and M.A. Hatfield, with the power of substitution, as his true
and lawful attorney-in-fact for the purpose of:  (i) executing in his name and
on his behalf Marshall & Ilsley Corporation's Form 10-K for the fiscal year
ended December 31, 1998 and any related amendments and/or supplements; (ii)
generally doing all things in his name and on his behalf in his capacity as a
director to enable Marshall & Ilsley Corporation to comply with the provisions
of the Securities Exchange Act of 1934, as amended, and all requirements of the
Securities and Exchange Commission; and (iii) ratifying and confirming his
signature as it may be signed by the attorney-in-fact to the Form 10-K and any
related amendments and/or supplements.

     Dated this 12th day of February, 1999.



                              /s/ Gus A. Zuehlke
                              ------------------
                              Gus A. Zuehlke

<PAGE>
 
                          DIRECTOR'S POWER OF ATTORNEY
                                (1998 Form 10-K)


     The undersigned director of Marshall & Ilsley Corporation designates each
of J.B. Wigdale and M.A. Hatfield, with the power of substitution, as his true
and lawful attorney-in-fact for the purpose of:  (i) executing in his name and
on his behalf Marshall & Ilsley Corporation's Form 10-K for the fiscal year
ended December 31, 1998 and any related amendments and/or supplements; (ii)
generally doing all things in his name and on his behalf in his capacity as a
director to enable Marshall & Ilsley Corporation to comply with the provisions
of the Securities Exchange Act of 1934, as amended, and all requirements of the
Securities and Exchange Commission; and (iii) ratifying and confirming his
signature as it may be signed by the attorney-in-fact to the Form 10-K and any
related amendments and/or supplements.

     Dated this 11th day of February, 1999.



                              /s/ Burleigh E. Jacobs
                              ----------------------
                              Burleigh E. Jacobs

<PAGE>
 
                          DIRECTOR'S POWER OF ATTORNEY
                                (1998 Form 10-K)


     The undersigned director of Marshall & Ilsley Corporation designates each
of J.B. Wigdale and M.A. Hatfield, with the power of substitution, as his true
and lawful attorney-in-fact for the purpose of:  (i) executing in his name and
on his behalf Marshall & Ilsley Corporation's Form 10-K for the fiscal year
ended December 31, 1998 and any related amendments and/or supplements; (ii)
generally doing all things in his name and on his behalf in his capacity as a
director to enable Marshall & Ilsley Corporation to comply with the provisions
of the Securities Exchange Act of 1934, as amended, and all requirements of the
Securities and Exchange Commission; and (iii) ratifying and confirming his
signature as it may be signed by the attorney-in-fact to the Form 10-K and any
related amendments and/or supplements.

     Dated this 11th day of February, 1999.



                              /s/ Jon F. Chait
                              ----------------
                              Jon F. Chait

<PAGE>
 
                          DIRECTOR'S POWER OF ATTORNEY
                                (1998 Form 10-K)


     The undersigned director of Marshall & Ilsley Corporation designates each
of J.B. Wigdale and M.A. Hatfield, with the power of substitution, as his true
and lawful attorney-in-fact for the purpose of:  (i) executing in his name and
on his behalf Marshall & Ilsley Corporation's Form 10-K for the fiscal year
ended December 31, 1998 and any related amendments and/or supplements; (ii)
generally doing all things in his name and on his behalf in his capacity as a
director to enable Marshall & Ilsley Corporation to comply with the provisions
of the Securities Exchange Act of 1934, as amended, and all requirements of the
Securities and Exchange Commission; and (iii) ratifying and confirming his
signature as it may be signed by the attorney-in-fact to the Form 10-K and any
related amendments and/or supplements.

     Dated this 11th day of February, 1999.



                              /s/ Stuart W. Tisdale
                              ---------------------
                              Stuart W. Tisdale

<PAGE>
 
                          DIRECTOR'S POWER OF ATTORNEY
                                (1998 Form 10-K)


     The undersigned director of Marshall & Ilsley Corporation designates each
of J.B. Wigdale and M.A. Hatfield, with the power of substitution, as his true
and lawful attorney-in-fact for the purpose of:  (i) executing in his name and
on his behalf Marshall & Ilsley Corporation's Form 10-K for the fiscal year
ended December 31, 1998 and any related amendments and/or supplements; (ii)
generally doing all things in his name and on his behalf in his capacity as a
director to enable Marshall & Ilsley Corporation to comply with the provisions
of the Securities Exchange Act of 1934, as amended, and all requirements of the
Securities and Exchange Commission; and (iii) ratifying and confirming his
signature as it may be signed by the attorney-in-fact to the Form 10-K and any
related amendments and/or supplements.

     Dated this 11th day of February, 1999.



                              /s/ Richard A. Abdoo
                              --------------------
                              Richard A. Abdoo

<PAGE>
 
                          DIRECTOR'S POWER OF ATTORNEY
                                (1998 Form 10-K)


     The undersigned director of Marshall & Ilsley Corporation designates each
of J.B. Wigdale and M.A. Hatfield, with the power of substitution, as his true
and lawful attorney-in-fact for the purpose of:  (i) executing in his name and
on his behalf Marshall & Ilsley Corporation's Form 10-K for the fiscal year
ended December 31, 1998 and any related amendments and/or supplements; (ii)
generally doing all things in his name and on his behalf in his capacity as a
director to enable Marshall & Ilsley Corporation to comply with the provisions
of the Securities Exchange Act of 1934, as amended, and all requirements of the
Securities and Exchange Commission; and (iii) ratifying and confirming his
signature as it may be signed by the attorney-in-fact to the Form 10-K and any
related amendments and/or supplements.

     Dated this 11th day of February, 1999.



                              /s/ J.B. Wigdale
                              ----------------
                              J.B. Wigdale

<PAGE>
 
                          DIRECTOR'S POWER OF ATTORNEY
                                (1998 Form 10-K)


     The undersigned director of Marshall & Ilsley Corporation designates each
of J.B. Wigdale and M.A. Hatfield, with the power of substitution, as his true
and lawful attorney-in-fact for the purpose of:  (i) executing in his name and
on his behalf Marshall & Ilsley Corporation's Form 10-K for the fiscal year
ended December 31, 1998 and any related amendments and/or supplements; (ii)
generally doing all things in his name and on his behalf in his capacity as a
director to enable Marshall & Ilsley Corporation to comply with the provisions
of the Securities Exchange Act of 1934, as amended, and all requirements of the
Securities and Exchange Commission; and (iii) ratifying and confirming his
signature as it may be signed by the attorney-in-fact to the Form 10-K and any
related amendments and/or supplements.

     Dated this 11th day of February, 1999.



                              /s/ Don R. O'Hare
                              -----------------
                              Don R. O'Hare

<PAGE>
 
                          DIRECTOR'S POWER OF ATTORNEY
                                (1998 Form 10-K)


     The undersigned director of Marshall & Ilsley Corporation designates each
of J.B. Wigdale and M.A. Hatfield, with the power of substitution, as her true
and lawful attorney-in-fact for the purpose of:  (i) executing in her name and
on her behalf Marshall & Ilsley Corporation's Form 10-K for the fiscal year
ended December 31, 1998 and any related amendments and/or supplements; (ii)
generally doing all things in her name and on her behalf in her capacity as a
director to enable Marshall & Ilsley Corporation to comply with the provisions
of the Securities Exchange Act of 1934, as amended, and all requirements of the
Securities and Exchange Commission; and (iii) ratifying and confirming her
signature as it may be signed by the attorney-in-fact to the Form 10-K and any
related amendments and/or supplements.

     Dated this 11th day of February, 1999.



                              /s/ Katharine C. Lyall
                              ----------------------
                              Katharine C. Lyall

<PAGE>
 
                          DIRECTOR'S POWER OF ATTORNEY
                                (1998 Form 10-K)


     The undersigned director of Marshall & Ilsley Corporation designates each
of J.B. Wigdale and M.A. Hatfield, with the power of substitution, as his true
and lawful attorney-in-fact for the purpose of:  (i) executing in his name and
on his behalf Marshall & Ilsley Corporation's Form 10-K for the fiscal year
ended December 31, 1998 and any related amendments and/or supplements; (ii)
generally doing all things in his name and on his behalf in his capacity as a
director to enable Marshall & Ilsley Corporation to comply with the provisions
of the Securities Exchange Act of 1934, as amended, and all requirements of the
Securities and Exchange Commission; and (iii) ratifying and confirming his
signature as it may be signed by the attorney-in-fact to the Form 10-K and any
related amendments and/or supplements.

     Dated this 23rd day of February, 1999.



                              /s/ J.A. Puelicher
                              ------------------
                              J.A. Puelicher

<PAGE>
  
                          DIRECTOR'S POWER OF ATTORNEY
                                (1998 Form 10-K)


     The undersigned director of Marshall & Ilsley Corporation designates each
of J.B. Wigdale and M.A. Hatfield, with the power of substitution, as his true
and lawful attorney-in-fact for the purpose of:  (i) executing in his name and
on his behalf Marshall & Ilsley Corporation's Form 10-K for the fiscal year
ended December 31, 1998 and any related amendments and/or supplements; (ii)
generally doing all things in his name and on his behalf in his capacity as a
director to enable Marshall & Ilsley Corporation to comply with the provisions
of the Securities Exchange Act of 1934, as amended, and all requirements of the
Securities and Exchange Commission; and (iii) ratifying and confirming his
signature as it may be signed by the attorney-in-fact to the Form 10-K and any
related amendments and/or supplements.

     Dated this 12th day of February, 1999.



                              /s/ J.P. Bolduc
                              ---------------
                              J.P. Bolduc

<PAGE>
 
                          DIRECTOR'S POWER OF ATTORNEY
                                (1998 Form 10-K)


     The undersigned director of Marshall & Ilsley Corporation designates each
of J.B. Wigdale and M.A. Hatfield, with the power of substitution, as his true
and lawful attorney-in-fact for the purpose of:  (i) executing in his name and
on his behalf Marshall & Ilsley Corporation's Form 10-K for the fiscal year
ended December 31, 1998 and any related amendments and/or supplements; (ii)
generally doing all things in his name and on his behalf in his capacity as a
director to enable Marshall & Ilsley Corporation to comply with the provisions
of the Securities Exchange Act of 1934, as amended, and all requirements of the
Securities and Exchange Commission; and (iii) ratifying and confirming his
signature as it may be signed by the attorney-in-fact to the Form 10-K and any
related amendments and/or supplements.

     Dated this 11th day of February, 1999.



                              /s/ Peter M. Platten, III
                              -------------------------
                              Peter M. Platten, III

<PAGE>
  
                          DIRECTOR'S POWER OF ATTORNEY
                                (1998 Form 10-K)


     The undersigned director of Marshall & Ilsley Corporation designates each
of J.B. Wigdale and M.A. Hatfield, with the power of substitution, as his true
and lawful attorney-in-fact for the purpose of:  (i) executing in his name and
on his behalf Marshall & Ilsley Corporation's Form 10-K for the fiscal year
ended December 31, 1998 and any related amendments and/or supplements; (ii)
generally doing all things in his name and on his behalf in his capacity as a
director to enable Marshall & Ilsley Corporation to comply with the provisions
of the Securities Exchange Act of 1934, as amended, and all requirements of the
Securities and Exchange Commission; and (iii) ratifying and confirming his
signature as it may be signed by the attorney-in-fact to the Form 10-K and any
related amendments and/or supplements.

     Dated this 12th day of February, 1999.



                              /s/ James F. Kress
                              ------------------
                              James F. Kress

<PAGE>
 
                          DIRECTOR'S POWER OF ATTORNEY
                                (1998 Form 10-K)


     The undersigned director of Marshall & Ilsley Corporation designates each
of J.B. Wigdale and M.A. Hatfield, with the power of substitution, as his true
and lawful attorney-in-fact for the purpose of:  (i) executing in his name and
on his behalf Marshall & Ilsley Corporation's Form 10-K for the fiscal year
ended December 31, 1998 and any related amendments and/or supplements; (ii)
generally doing all things in his name and on his behalf in his capacity as a
director to enable Marshall & Ilsley Corporation to comply with the provisions
of the Securities Exchange Act of 1934, as amended, and all requirements of the
Securities and Exchange Commission; and (iii) ratifying and confirming his
signature as it may be signed by the attorney-in-fact to the Form 10-K and any
related amendments and/or supplements.

     Dated this 11th day of February, 1999.



                              /s/ San W. Orr, Jr.
                              -------------------
                              San W. Orr, Jr.

<PAGE>
 
                          DIRECTOR'S POWER OF ATTORNEY
                                (1998 Form 10-K)


     The undersigned director of Marshall & Ilsley Corporation designates each
of J.B. Wigdale and M.A. Hatfield, with the power of substitution, as his true
and lawful attorney-in-fact for the purpose of:  (i) executing in his name and
on his behalf Marshall & Ilsley Corporation's Form 10-K for the fiscal year
ended December 31, 1998 and any related amendments and/or supplements; (ii)
generally doing all things in his name and on his behalf in his capacity as a
director to enable Marshall & Ilsley Corporation to comply with the provisions
of the Securities Exchange Act of 1934, as amended, and all requirements of the
Securities and Exchange Commission; and (iii) ratifying and confirming his
signature as it may be signed by the attorney-in-fact to the Form 10-K and any
related amendments and/or supplements.

     Dated this 11th day of February, 1999.



                              /s/ Edward L. Meyer, Jr.
                              ------------------------
                              Edward L. Meyer, Jr.


<TABLE> <S> <C>

<PAGE>
 
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<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
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                              685
                                    112,757
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<INTEREST-INCOME-NET>                          676,070
<LOAN-LOSSES>                                   27,090
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<EXPENSE-OTHER>                                940,028
<INCOME-PRETAX>                                465,285
<INCOME-PRE-EXTRAORDINARY>                     301,323
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
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<EPS-PRIMARY>                                     2.79
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<YIELD-ACTUAL>                                    3.69
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<CHARGE-OFFS>                                   20,945
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<ALLOWANCE-DOMESTIC>                           226,052
<ALLOWANCE-FOREIGN>                                  0
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</TABLE>


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