MERCANTILE BANCORPORATION INC
10-K405/A, 1999-06-29
NATIONAL COMMERCIAL BANKS
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==============================================================================
                   SECURITIES AND EXCHANGE COMMISSION
                         WASHINGTON, D.C. 20549

                              FORM 10-K/A

       AMENDMENT NO. 1 TO ANNUAL REPORT PURSUANT TO SECTION 13 OF
                   THE SECURITIES EXCHANGE ACT OF 1934

 FOR THE FISCAL YEAR ENDED DECEMBER 31, 1998     COMMISSION FILE NO. 1-11792

                      MERCANTILE BANCORPORATION INC.
          (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

                    MISSOURI                       43-0951744
            (STATE OF INCORPORATION)             (IRS EMPLOYER
                                              IDENTIFICATION NO.)

                  P.O. BOX 524                    63166-0524
              ST. LOUIS, MISSOURI                 (ZIP CODE)
   (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)

REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: 314-418-2525

SECURITIES REGISTERED PURSUANT TO        NAME OF EXCHANGE ON WHICH REGISTERED:
 SECTION 12(b) OF THE ACT:
   (1) COMMON STOCK ($0.01 PAR VALUE)    (1) NEW YORK STOCK EXCHANGE
   (2) PREFERRED STOCK PURCHASE RIGHTS   (2) NEW YORK STOCK EXCHANGE

SECURITIES REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT:  None

INDICATE BY CHECK MARK WHETHER THE REGISTRANT (1) HAS FILED ALL REPORTS
REQUIRED TO BE FILED BY SECTION 13 OF THE SECURITIES EXCHANGE ACT OF 1934
DURING THE PRECEDING 12 MONTHS, 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. [X]

STATE THE AGGREGATE MARKET VALUE OF THE VOTING STOCK HELD BY NON-AFFILIATES OF
THE REGISTRANT AS OF  JUNE 17, 1999:
COMMON STOCK, $0.01 PAR VALUE, $7,524,087,509.

INDICATE THE NUMBER OF SHARES OUTSTANDING OF EACH OF THE REGISTRANT'S CLASSES
OF COMMON STOCK, AS OF JUNE 17, 1999:
COMMON STOCK $0.01 PAR VALUE, 158,156,398 SHARES OUTSTANDING.

                   DOCUMENTS INCORPORATED BY REFERENCE

THE FOLLOWING DOCUMENTS ARE INCORPORATED BY REFERENCE:  NOT APPLICABLE.

==============================================================================


<PAGE>
<PAGE>

The "Exhibit Index" as previously filed with the Form 10-K is hereby amended
by inserting the following entries:

      No. 2-1     Agreement and Plan of Merger by and between Mercantile
                  Bancorporation Inc. and Firstar Corporation dated as
                  of April 30, 1999.<F**>

      No. 23-2    Consent of KPMG LLP (relating to report dated June 23,
                  1999, Mercantile Bancorporation Inc. Horizon
                  Investment and Savings Plan and Trust Financial
                  Statements).<F*>

      No. 99-1    Report of the Independent Auditors KPMG LLP dated June
                  23, 1999; Statements of Net Assets Available for Plan
                  Benefits of Mercantile Bancorporation Inc. Horizon
                  Investment and Savings Plan and Trust as of December
                  31, 1998 and 1997; Statements of Changes in Net Assets
                  Available For Plan Benefits for the years then ended;
                  and the Notes and Schedules thereto.<F*>

      No. 99-2    Stock Option Agreement, dated April 30, 1999, between
                  Firstar Corporation, a Wisconsin corporation
                  ("Issuer"), and Mercantile Bancorporation Inc., a
                  Missouri corporation ("Grantee").<F**>

      No. 99-3    Stock Option Agreement, dated April 30, 1999, between
                  Mercantile Bancorporation Inc., a Missouri corporation
                  ("Issuer"), and Firstar Corporation, a Wisconsin
                  Corporation ("Grantee").<F**>

[FN]
<F*>  Filed herewith.
<F**> Filed with the Registrant's Quarterly Report on Form 10-Q for the
      quarter ended March 31, 1999 dated May 14, 1999.


                              
<PAGE>
<PAGE>

                              SIGNATURES

     Pursuant to the requirements of the Securities Exchange Act of 1934,
the Registrant has duly caused this amendment to be signed on its behalf by
the undersigned, thereunto duly authorized.




                                  MERCANTILE BANCORPORATION INC.
                                  (Registrant)



Date: June 29, 1999               By: /s/ John W. McClure
                                      ---------------------------
                                      John W. McClure
                                      Vice Chairman and Chief
                                        Financial Officer


                              
<PAGE>
<PAGE>

                          EXHIBIT INDEX


     EXHIBIT NO.                    DESCRIPTION

      No. 2-1        Agreement and Plan of Merger by and between
                     Mercantile Bancorporation Inc. and Firstar
                     Corporation dated as of April 30, 1999, as filed
                     as Exhibit 2 to the Registrant's Quarterly Report
                     on Form 10-Q for the quarter ended March 31, 1999,
                     is incorporated herein by reference.

      No. 3-1(a)     Restated Articles of Incorporation of the
                     Registrant, as amended and currently in effect,
                     filed as Exhibit 3 to Registrant's Quarterly Report
                     on Form 10-Q for the quarter ended March 31, 1997,
                     are incorporated herein by reference.

      No. 3-1(b)     Certificate of Designation, Preferences and Rights
                     of Series B Junior Participating Preferred Stock of
                     the Registrant filed as Exhibit 3-1(b) to
                     Registrant's Quarterly Report on Form 10-Q for the
                     quarter ended June 30, 1998 (Commission File No.
                     1-11792), is incorporated herein by reference.

      No. 3-2        By-Laws of the Registrant, as amended and currently
                     in effect, filed as Exhibit 3.2 to Amendment No. 2
                     to Registrant's Registration Statement on Form 4
                     (No. 333-17757), are incorporated herein by
                     reference.

      No. 4-1        Form of Indenture Regarding Subordinated Securities
                     between the Registrant and The First National Bank
                     of Chicago as Trustee, filed on March 31, 1992 as
                     Exhibit 4.1 to Registrant's Report on Form 8-K
                     dated September 24, 1992 (Commission File No.
                     1-11792), is incorporated herein by reference.

      No. 4-2        Rights Agreement dated as of May 20, 1998, between
                     Registrant and Harris Trust and Savings Bank, as
                     Rights Agent (including as an exhibit thereto the
                     form of Rights Certificate) filed as Exhibit 4-2 to
                     the Registrant's Quarterly Report on Form 10-Q for
                     the quarter ended June 30, 1998 (Commission File
                     No. 1-11792), is incorporated herein by
                     reference.

      No. 4-3        Form of Indenture Regarding Senior Debt Securities,
                     filed as Exhibit 4.1 to Registrant's Registration
                     Statement on Form S-3 (No. 333-25775), is
                     incorporated herein by reference.

      No. 4-4        Form of Indenture Regarding Subordinated Debt
                     Securities, filed as Exhibit 4.2 to Registrant's
                     Registration Statement on Form S-3 (No. 333-25775),
                     is incorporated herein by reference.

      No. 4-5        Indenture, dated February 4, 1997; First
                     Supplemental Indenture, dated February 4, 1997, and
                     Supplemental Indenture of First Supplemental
                     Indenture, dated May 22, 1997, between the Company,
                     as issuer, and The Chase Manhattan Bank, as
                     Indenture Trustee, filed as Exhibits 4.5, 4.6 and
                     4.12, respectively, to the Company's Registration
                     Statement on Form S-4 (No. 333-25131), are
                     incorporated herein by reference.

      No. 10-1       The Mercantile Bancorporation Inc. 1987 Stock
                     Option Plan, as amended, filed as Exhibit 10-3 to
                     Registrant's Annual Report on Form 10-K for the
                     year ended December 31, 1989 (Commission File No.
                     1-11792), is incorporated herein by
                     reference. <F+>




<PAGE>
<PAGE>

      No. 10-2       The Mercantile Bancorporation Inc. Amended and
                     Restated Executive Incentive Compensation Plan,
                     filed as Annex H to Registrant's definitive Proxy
                     Statement for the 1997 Annual Meeting of
                     Shareholders, is incorporated herein by
                     reference. <F+>

      No. 10-3       The Mercantile Bancorporation Inc. Employee Stock
                     Purchase Plan, filed as Exhibit 10-7 to Registrant's
                     Annual Report on Form 10-K for the year ended December
                     31, 1989 (Commission File No. 1-11792), is
                     incorporated herein by reference. <F+>

      No. 10-4       The Mercantile Bancorporation Inc. 1991 Employee
                     Incentive Plan, filed as Exhibit 10-7 to Registrant's
                     Annual Report on Form 10-K for the year ended December
                     31, 1990 (Commission File No. 1-11792), is
                     incorporated herein by reference. <F+>

      No. 10-5       Amendment Number One to the Mercantile Bancorporation
                     Inc. 1991 Employee Incentive Plan, filed as Exhibit
                     10-6 to Registrant's Report on Form 10-K for the year
                     ended December 31, 1994 (Commission File No. 1-11792),
                     is incorporated herein by reference. <F+>

      No. 10-6       The Mercantile Bancorporation Inc. Amended and
                     Restated Stock Incentive Plan, filed as Annex G to
                     Registrant's definitive Proxy Statement for the 1997
                     Annual Meeting of Shareholders (Commission File No.
                     1-11792), is incorporated herein by reference. <F+>

      No. 10-7       The Mercantile Bancorporation Inc. 1994 Stock
                     Incentive Plan for Non-Employee Directors, filed as
                     Appendix E to Registrant's definitive Proxy Statement
                     for the 1994 Annual Meeting of Shareholders
                     (Commission File No. 1-11792), is incorporated herein
                     by reference. <F+>

      No. 10-8       The Mercantile Bancorporation Inc. Amended and
                     Restated Voluntary Deferred Compensation Plan, filed
                     as Exhibit 10.1 to Registrant's Registration Statement
                     on Form S-8 (File No. 333-47713), is incorporated
                     herein by reference. <F+>

      No. 10-9       Mercantile Bancorporation Inc. Supplemental Retirement
                     Plan, filed as Exhibit 10-12 to Registrant's Annual
                     Report on Form 10-K for the year ended December 31,
                     1992 (Commission File No. 1-11792), is incorporated
                     herein by reference. <F+>

      No. 10-10      Mercantile Bancorporation Inc. Voluntary Deferred
                     Compensation Plan for Non-Employee Affiliate Directors
                     and Advisory Directors, filed as Exhibit 10.3 to
                     Registrant's Registration Statement on Form S-8 (File
                     No. 333-47713), is incorporated herein by reference. <F+>

      No. 10-11      Mercantile Bancorporation Inc. Amended and Restated
                     Stock Incentive Plan for Non-Employee Directors, filed
                     as Exhibit 10.2 to Registrant's Registration Statement
                     on Form S-8 (File No. 333-47713), is incorporated
                     herein by reference. <F+>

      No. 10-12      Employment Agreement for Thomas H. Jacobsen, as
                     amended and restated, filed as Exhibit 10.9 to
                     Registrant's Annual Report on Form 10-K for the year
                     ended December 31, 1997 (Commission File No. 1-11792),
                     is incorporated herein by reference. <F+>




<PAGE>
<PAGE>

      No. 10-13      Form of Change of Control Employment Agreement for
                     John W. McClure, W. Randolph Adams, John Q. Arnold and
                     Certain Other Executive Officers, filed as Exhibit 10-
                     10 to Registrant's Report on Form 10-K for the year
                     ended December 31, 1989 (Commission File No. 1-11792),
                     is incorporated herein by reference. <F+>

      No. 10-14      Employment Agreement for Alvin J. Siteman, dated
                     November 18, 1996, filed as Exhibit 10.3 to
                     Registrant's Report on Form 10-Q for the quarter ended
                     March 31, 1997 (Commission File No. 1-11792), is
                     incorporated herein by reference. <F+>

      No. 10-15      Employment Agreement for John P. Dubinsky, dated
                     October 27, 1996, filed as Exhibit 10.4 to
                     Registrant's Report on Form 10-Q for the quarter ended
                     March 31, 1997 (Commission File No. 1-11792), is
                     incorporated herein by reference. <F+>

      No. 13         Excerpts from Annual Report of the Registrant to its
                     Shareholders for the year ended December 31, 1998. <F*>

      No. 21         Subsidiaries of the Registrant as of February 26,
                     1998. <F*>

      No. 23-1       Consent of KPMG LLP. <F*>

      No. 23-2       Consent of KPMG LLP (relating to report dated June 23,
                     1999, Mercantile Bancorporation Inc. Horizon
                     Investment and Savings Plan and Trust Financial
                     Statements.)

      No. 24         Power of Attorney (on signature page). <F*>

      No. 27         Financial Data Schedule. <F*>

      No. 99-1       Report of the Independent Auditors KPMG LLP dated June
                     23, 1999; Statements of Net Assets Available for Plan
                     Benefits of Mercantile Bancorporation Inc. Horizon
                     Investment and Savings Plan and Trust as of December
                     31, 1998 and 1997; Statements of Changes in Net Assets
                     Available For Plan Benefits for the years then ended;
                     and the Notes and Schedules thereto.

      No. 99-2       Stock Option Agreement, dated April 30, 1999, between
                     Firstar Corporation, a Wisconsin corporation
                     ("Issuer") and Mercantile Bancorporation Inc., a
                     Missouri corporation ("Grantee"), as filed as Exhibit 99.1
                     to the Registrant's Quarterly Report on Form 10-Q for the
                     quarter ended March 31, 1999, is incorporated herein by
                     reference.

      No. 99-3       Stock Option Agreement, dated April 30, 1999, between
                     Mercantile Bancorporation Inc., a Missouri corporation
                     ("Issuer"), and Firstar Corporation, a Wisconsin
                     Corporation ("Grantee"), as filed as Exhibit 99.2 to the
                     Registrant's Quarterly Report on Form 10-Q for the quarter
                     ended March 31, 1999, is incorporated herein by reference.
[FN]
<F*> Filed with the Registrant's Annual Report on Form 10-K for the year
     ended December 31, 1998.

<F+> Management contract or compensatory plan or arrangement.



<PAGE>

                        EXHIBIT 23-2
                        ------------

<PAGE>
<PAGE>


                   INDEPENDENT AUDITORS' CONSENT


The Board of Directors
Mercantile Bancorporation Inc.:

Plan Administrator
Mercantile Bancorporation Inc.
  Horizon Investment and Savings Plan and Trust:


We consent to incorporation by reference in the Registration Statement
(No. 33-35139) on Form S-8 of Mercantile Bancorporation Inc. related to
the Mercantile Bancorporation Inc. Horizon Investment and Savings Plan
and Trust of our report dated June 23, 1999, relating to the statements
of net assets available for plan benefits of the Mercantile
Bancorporation Inc. Horizon Investment and Savings Plan and Trust as of
December 31, 1998 and 1997, and the related statements of changes in net
assets available for plan benefits for the years then ended and the
related schedules, which report appears in the 1998 Annual Report on
Form 10-K/A, of Mercantile Bancorporation Inc.


                                   /s/ KPMG LLP


St. Louis, Missouri
June 28, 1999


<PAGE>

                        EXHIBIT 99-1
                        ------------





<PAGE>
<PAGE>




               MERCANTILE BANCORPORATION INC.
               HORIZON INVESTMENT AND SAVINGS
                       PLAN AND TRUST

             Financial Statements and Schedules

                 December 31, 1998 and 1997

        (With Independent Auditors' Report Thereon)


                              
<PAGE>
<PAGE>

                         MERCANTILE BANCORPORATION INC.
                  HORIZON INVESTMENT AND SAVINGS PLAN AND TRUST


<TABLE>
                        TABLE OF CONTENTS AND DEFINITIONS
<CAPTION>
                                                                                          PAGE
<S>                                                                                         <C>
TABLE OF CONTENTS:
   Independent Auditors' Report                                                             1

   Statement of Net Assets Available for Plan Benefits, December 31, 1998                   2

   Statement of Net Assets Available for Plan Benefits, December 31, 1997                   3

   Statement of Changes in Net Assets Available for Plan Benefits,
      Year ended December 31, 1998                                                          4

   Statement of Changes in Net Assets Available for Plan Benefits,
      Year ended December 31, 1997                                                          5

   Notes to Financial Statements, December 31, 1998 and 1997                                6

<CAPTION>
                                                                               SCHEDULE
<S>                                                                              <C>       <C>
   Item 27a:
      Schedule of Assets Held for Investment Purposes, December 31, 1998           1       13

      Schedule of Assets Held for Investment Purposes Which
        Were Both Acquired and Disposed of Within the Plan Year                  <F*>

   Item 27b - Schedule of Loans or Fixed Income Obligations                      <F*>

   Item 27c - Schedule of Leases in Default or Classified as Uncollectible       <F*>

   Item 27d - Schedule of Reportable Transactions, Year ended
      December 31, 1998                                                            2       14

   Item 27e - Schedule of Nonexempt Transactions                                 <F*>

<FN>
<F*> There were no assets held for investment purposes which were both acquired and disposed of
     within the plan year ended December 31, 1998, and no nonexempt transactions during the
     year ended December 31, 1998 which require separate disclosure. There were no known loans,
     fixed income obligations, or leases in default or classified as uncollectible which have
     not been reported during the year ended December 31, 1998.
</TABLE>

DEFINITIONS:

   Plan                 - Mercantile Bancorporation Inc. Horizon Investment
                          and Savings Plan and Trust
   Trustee              - Mercantile Bank N.A.
   ERISA                - Employee Retirement Income Security Act of 1974
   Mercantile (or the
     Company)           - Mercantile Bancorporation Inc. and subsidiaries
   Plan Administrator   - Mercantile Employee Benefits Committee




<PAGE>
<PAGE>

                INDEPENDENT AUDITORS' REPORT

Mercantile Employee Benefits Committee
Mercantile Bancorporation Inc.
  Horizon Investment and Savings Plan and Trust:


We have audited the accompanying statements of net assets available for
plan benefits of the Mercantile Bancorporation Inc. Horizon Investment
and Savings Plan and Trust as of December 31, 1998 and 1997, and the
related statements of changes in net assets available for plan benefits
for the years then ended. These financial statements are the
responsibility of the Plan's management. Our responsibility is to
express an opinion on these 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 financial statements are
free of material misstatement. An audit includes examining, on a test
basis, evidence supporting the amounts and disclosures in the financial
statements. An audit also includes assessing the accounting principles
used and significant estimates made by management, as well as evaluating
the overall financial statement presentation. We believe that our audits
provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present
fairly, in all material respects, the net assets available for plan
benefits as of December 31, 1998 and 1997, and the changes in net assets
available for plan benefits for the years then ended in conformity with
generally accepted accounting principles.

Our audits were performed for the purpose of forming an opinion on the
basic financial statements taken as a whole. The supplemental
information included in Schedules 1 and 2 is presented for the purpose
of additional analysis and is not a required part of the basic financial
statements but is supplementary information required by the Department
of Labor's Rules and Regulations for Reporting and Disclosure under the
Employee Retirement Income Security Act of 1974. The fund information in
the statements of net assets available for plan benefits and the
statements of changes in net assets available for plan benefits is
presented for purposes of additional analysis rather than to present the
net assets available for plan benefits and the changes in net assets
available for plan benefits of each fund. The supplemental schedules and
fund information have been subjected to the auditing procedures applied
in the audits of the basic financial statements and, in our opinion, are
fairly stated in all material respects in relation to the basic
financial statements taken as a whole.


                                   /s/ KPMG LLP


June 23, 1999
St. Louis, Missouri




                              
<PAGE>
<PAGE>

<TABLE>
                                       MERCANTILE BANCORPORATION INC.
                                HORIZON INVESTMENT AND SAVINGS PLAN AND TRUST

                             Statement of Net Assets Available for Plan Benefits

                                              December 31, 1998
<CAPTION>
                                                                                  PARTICIPANT-DIRECTED FUNDS
                                                           ----------------------------------------------------------------------
                                                                                           GROWTH       GOVERNMENT
                                                             GROWTH                         AND            AND           MONEY
                                                             EQUITY        BALANCED        INCOME       CORPORATE        MARKET
                                                              FUND           FUND           FUND        BOND FUND         FUND
                                                           ----------     ----------     ----------     ----------     ----------
<S>                                                        <C>            <C>            <C>            <C>            <C>
Assets:
   Total noninterest-bearing cash                          $       --             --             --             --             --

   Receivables:
     Employer contributions                                        --             --             --             --             --
     Participant contributions                                 28,845         63,845        172,024         24,313         22,415
     Accrued income                                             3,440         56,570         48,772         46,089         54,714
                                                           ----------     ----------     ----------     ----------     ----------

           Total receivables                                   32,285        120,415        220,796         70,402         77,129
                                                           ----------     ----------     ----------     ----------     ----------

   Investments at fair value:
     Interest-bearing cash (including
       money market funds)                                      2,286          1,726          1,707          1,688     14,607,267
     Value of interest in registered
       investment companies                                 8,477,318     31,730,033     60,073,362     10,307,920             --
     Common stock                                                  --             --             --             --             --
     Loans to participants                                         --             --             --             --             --
     Other                                                         --             --             --             --             --
                                                           ----------     ----------     ----------     ----------     ----------

           Total investments                                8,479,604     31,731,759     60,075,069     10,309,608     14,607,267
                                                           ----------     ----------     ----------     ----------     ----------

           Total assets                                     8,511,889     31,852,174     60,295,865     10,380,010     14,684,396

Liabilities - accrued expenses                                  1,173          3,388          6,673          1,166          2,008
                                                           ----------     ----------     ----------     ----------     ----------

           Net assets available
             for plan benefits                             $8,510,716     31,848,786     60,289,192     10,378,844     14,682,388
                                                           ==========     ==========     ==========     ==========     ==========

<CAPTION>
                                                                 PARTICIPANT-DIRECTED FUNDS
                                                          -----------------------------------------
                                                                                                         NONPAR-
                                                           SMALL CAP     MERCANTILE        INTER-       TICIPANT-
                                                             EQUITY        STOCK          NATIONAL       DIRECTED
                                                              FUND          FUND            FUND          FUNDS          TOTAL
                                                          -----------    -----------      ---------     ----------    -----------
<S>                                                        <C>           <C>              <C>           <C>           <C>
Assets:
   Total noninterest-bearing cash                                  --             --             --         12,573         12,573

   Receivables:
     Employer contributions                                        --        384,596             --             --        384,596
     Participant contributions                                 66,329        186,458         30,798             --        595,027
     Accrued income                                                 9      1,516,529             51         46,315      1,772,489
                                                           ----------    -----------      ---------     ----------    -----------

           Total receivables                                   66,338      2,087,583         30,849         46,315      2,752,112
                                                           ----------    -----------      ---------     ----------    -----------

   Investments at fair value:
     Interest-bearing cash (including
       money market funds)                                      2,057        308,467          1,808        138,446     15,065,452
     Value of interest in registered
       investment companies                                13,333,528             --      6,866,521             --    130,788,682
     Common stock                                                  --    226,222,830             --      3,653,192    229,876,022
     Loans to participants                                         --             --             --      8,066,838      8,066,838
     Other                                                         --             --             --         13,488         13,488
                                                           ----------    -----------      ---------     ----------    -----------

           Total investments                               13,335,585    226,531,297      6,868,329     11,871,964    383,810,482
                                                           ----------    -----------      ---------     ----------    -----------

           Total assets                                    13,401,923    228,618,880      6,899,178     11,930,852    386,575,167

Liabilities - accrued expenses                                 14,213         32,703            994             --         62,318
                                                           ----------    -----------      ---------     ----------    -----------

           Net assets available
             for plan benefits                             13,387,710    228,586,177      6,898,184     11,930,852    386,512,849
                                                           ==========    ===========      =========     ==========    ===========

See accompanying notes to financial statements.
</TABLE>
                                2

    
<PAGE>
<PAGE>

<TABLE>
                                       MERCANTILE BANCORPORATION INC.
                                HORIZON INVESTMENT AND SAVINGS PLAN AND TRUST

                             Statement of Net Assets Available for Plan Benefits

                                              December 31, 1997
<CAPTION>
                                                                                   PARTICIPANT-DIRECTED FUNDS
                                                           ----------------------------------------------------------------------
                                                                                           GROWTH        GOVERNMENT
                                                             GROWTH                          AND            AND          MONEY
                                                             EQUITY        BALANCED        INCOME        CORPORATE       MARKET
                                                              FUND           FUND           FUND         BOND FUND        FUND
                                                           ----------     ----------     ----------      ---------     ----------
<S>                                                        <C>            <C>            <C>             <C>           <C>
Assets:
   Total noninterest-bearing cash                          $       --            940            470             --             --

   Receivables:
     Employer contributions                                        --             --             --             --             --
     Accrued income                                             2,485         66,967         81,340         41,481         59,077
     Interfund transfers                                        1,522        124,660        320,245         43,669         42,905
                                                           ----------     ----------     ----------      ---------     ----------

           Total receivables                                    4,007        191,627        401,585         85,150        101,982
                                                           ----------     ----------     ----------      ---------     ----------

   Investments at fair value:
     Interest-bearing cash (including
       money market funds)                                      9,446            579          5,645             57     13,947,792
     Value of interest in registered
       investment companies                                 4,372,071     27,691,361     50,224,411      9,147,640             --
     Common stock                                                  --             --             --             --             --
     Loans to participants                                         --             --             --             --             --
     Other                                                         --             --             --             --             --
                                                           ----------     ----------     ----------      ---------     ----------

           Total investments                                4,381,517     27,691,940     50,230,056      9,147,697     13,947,792
                                                           ----------     ----------     ----------      ---------     ----------

Liabilities:
   Accrued expenses                                               341          3,032          2,161          1,573          1,924
   Interfund transfers                                         68,811             --             --             --             --
                                                           ----------     ----------     ----------      ---------     ----------

           Total liabilities                                   69,152          3,032          2,161          1,573          1,924
                                                           ----------     ----------     ----------      ---------     ----------

           Net assets available
             for plan benefits                             $4,316,372     27,881,475     50,629,950      9,231,274     14,047,850
                                                           ==========     ==========     ==========      =========     ==========


<PAGE>
CAPTION>
                                                                 PARTICIPANT-DIRECTED FUNDS
                                                          -----------------------------------------
                                                                                                          NONPAR-
                                                           SMALL CAP     MERCANTILE        INTER-        TICIPANT-
                                                            EQUITY         STOCK          NATIONAL       DIRECTED
                                                             FUND           FUND            FUND          FUNDS          TOTAL
                                                          -----------    -----------      ---------     ----------    -----------
<S>                                                        <C>           <C>              <C>           <C>           <C>
Assets:
   Total noninterest-bearing cash                                  --            470             --             --          1,880

   Receivables:
     Employer contributions                                        --      5,702,174             --             --      5,702,174
     Accrued income                                               112      1,332,584             85          3,752      1,587,883
     Interfund transfers                                      136,419        422,161         64,063             --      1,155,644
                                                           ----------    -----------      ---------     ----------    -----------

           Total receivables                                  136,531      7,456,919         64,148          3,752      8,445,701
                                                           ----------    -----------      ---------     ----------    -----------

   Investments at fair value:
     Interest-bearing cash (including
       money market funds)                                        877        592,932          1,142      1,413,427     15,971,897
     Value of interest in registered
       investment companies                                12,841,759             --      5,301,944             --    109,579,186
     Common stock                                                  --    285,308,617             --             --    285,308,617
     Loans to participants                                         --             --             --      8,837,826      8,837,826
     Other                                                         --             --             --         13,489         13,489
                                                           ----------    -----------      ---------     ----------    -----------

           Total investments                               12,842,636    285,901,549      5,303,086     10,264,742    419,711,015
                                                           ----------    -----------      ---------     ----------    -----------

Liabilities:
   Accrued expenses                                             2,088         32,215            821             --         44,155
   Interfund transfers                                         11,154             --             --      1,075,679      1,155,644
                                                           ----------    -----------      ---------     ----------    -----------

           Total liabilities                                   13,242         32,215            821      1,075,679      1,199,799
                                                           ----------    -----------      ---------     ----------    -----------

           Net assets available
             for plan benefits                             12,965,925    293,326,723      5,366,413      9,192,815    426,958,797
                                                           ==========    ===========      =========     ==========    ===========

See accompanying notes to financial statements.
</TABLE>
                                3

<PAGE>
<PAGE>

<TABLE>
                                       MERCANTILE BANCORPORATION INC.
                                HORIZON INVESTMENT AND SAVINGS PLAN AND TRUST

                       Statement of Changes in Net Assets Available for Plan Benefits

                                        Year ended December 31, 1998
<CAPTION>
                                                                                    PARTICIPANT-DIRECTED FUNDS
                                                           ----------------------------------------------------------------------
                                                                                           GROWTH       GOVERNMENT
                                                             GROWTH                         AND            AND           MONEY
                                                             EQUITY         BALANCED       INCOME       CORPORATE        MARKET
                                                              FUND            FUND          FUND        BOND FUND         FUND
                                                           ----------     ----------     ----------     ----------     ----------
<S>                                                        <C>            <C>            <C>            <C>            <C>
Additions:
   Contributions from:
     Employer                                              $       --             --             --             --             --
     Participants                                             552,839      1,781,041      4,902,030        706,532        632,157
                                                           ----------     ----------     ----------     ----------     ----------

           Total contributions                                552,839      1,781,041      4,902,030        706,532        632,157
                                                           ----------     ----------     ----------     ----------     ----------

   Earnings (loss) on investments:
     Interest:
       Interest-bearing cash (including money market
         funds)                                                 1,550          2,926          6,162          1,091        680,060
       Loans to participants                                       --             --             --             --             --
                                                           ----------     ----------     ----------     ----------     ----------

           Total interest                                       1,550          2,926          6,162          1,091        680,060

     Common stock dividends                                        --             --             --             --             --
     Net appreciation (depreciation) in fair value of
       investments in common stock                                 --             --             --             --             --
     Net investment appreciation (depreciation) in fair
       value of investments in registered investment
       companies                                            1,746,727      3,201,171      6,689,048        812,241             --
     Other income                                                   3             18             32              6              9
                                                           ----------     ----------     ----------     ----------     ----------

           Total earnings (loss) on investments             1,748,280      3,204,115      6,695,242        813,338        680,069
                                                           ----------     ----------     ----------     ----------     ----------

           Total additions                                  2,301,119      4,985,156     11,597,272      1,519,870      1,312,226
                                                           ----------     ----------     ----------     ----------     ----------

Deductions:
   Administrative expenses                                      4,483         17,260         38,864          5,071          7,781
   Benefit payments to participants or beneficiaries          879,858      2,557,634      5,079,363      1,091,397      4,231,691
                                                           ----------     ----------     ----------     ----------     ----------

           Total deductions                                   884,341      2,574,894      5,118,227      1,096,468      4,239,472
                                                           ----------     ----------     ----------     ----------     ----------

           Net increase (decrease) in net assets
             available for plan benefits prior to
             transfers                                      1,416,778      2,410,262      6,479,045        423,402     (2,927,246)

Transfers to the Plan                                       1,267,469      1,117,321      3,321,247        374,649      4,108,574
Interfund transfers, net                                    1,510,097        439,728       (141,050)       349,519       (546,790)
                                                           ----------     ----------     ----------     ----------     ----------

           Net increase (decrease) in net assets
             available for plan benefits                    4,194,344      3,967,311      9,659,242      1,147,570        634,538

Net assets available for plan benefits:
   Beginning of year                                        4,316,372     27,881,475     50,629,950      9,231,274     14,047,850
                                                           ----------     ----------     ----------     ----------     ----------

   End of year                                             $8,510,716     31,848,786     60,289,192     10,378,844     14,682,388
                                                           ==========     ==========     ==========     ==========     ==========


<PAGE>
<CAPTION>
                                                                 PARTICIPANT-DIRECTED FUNDS
                                                          -----------------------------------------
                                                                                                         NONPAR-
                                                           SMALL CAP     MERCANTILE        INTER-       TICIPANT-
                                                            EQUITY          STOCK         NATIONAL       DIRECTED
                                                             FUND           FUND            FUND          FUNDS          TOTAL
                                                          -----------    -----------      ---------     ----------    -----------
<S>                                                        <C>           <C>              <C>           <C>           <C>
Additions:
   Contributions from:
     Employer                                                      --      9,894,517             --             --      9,894,517
     Participants                                           2,019,403      6,370,038        900,829          6,117     17,870,986
                                                           ----------    -----------      ---------     ----------    -----------

           Total contributions                              2,019,403     16,264,555        900,829          6,117     27,765,503
                                                           ----------    -----------      ---------     ----------    -----------

   Earnings (loss) on investments:
     Interest:
       Interest-bearing cash (including money market
         funds)                                                 2,043         62,187          1,171        107,831        865,021
     Loans to participants                                         --             --             --        825,785        825,785
                                                           ----------    -----------      ---------     ----------    -----------

           Total interest                                       2,043         62,187          1,171        933,616      1,690,806

     Common stock dividends                                        --      5,988,124             --         47,114      6,035,238
     Net appreciation (depreciation) in fair value of
       investments in common stock                                 --    (72,727,821)            --        574,558    (72,153,263)
     Net investment appreciation (depreciation) in fair
       value of investments in registered investment
       companies                                           (1,244,531)            --        950,677             --     12,155,333
     Other income                                                   9             --              4        102,353        102,434
                                                           ----------    -----------      ---------     ----------    -----------

           Total earnings (loss) on investments            (1,242,479)   (66,677,510)       951,852      1,657,641    (52,169,452)
                                                           ----------    -----------      ---------     ----------    -----------

           Total additions                                    776,924    (50,412,955)     1,852,681      1,663,758    (24,403,949)
                                                           ----------    -----------      ---------     ----------    -----------

Deductions:
   Administrative expenses                                     22,689        193,088          5,345          3,177        297,758
   Benefit payments to participants or beneficiaries        1,303,886     31,896,939        571,646     11,577,200     59,189,614
                                                           ----------    -----------      ---------     ----------    -----------

           Total deductions                                 1,326,575     32,090,027        576,991     11,580,377     59,487,372
                                                           ----------    -----------      ---------     ----------    -----------

           Net increase (decrease) in net assets
             available for plan benefits prior to
             transfers                                       (549,651)   (82,502,982)     1,275,690     (9,916,619)   (83,891,321)

Transfers to the Plan                                         818,300     17,129,897        234,375     15,073,541     43,445,373
Interfund transfers, net                                      153,136        632,539         21,706     (2,418,885)            --
                                                           ----------    -----------      ---------     ----------    -----------

           Net increase (decrease) in net assets
             available for plan benefits                      421,785    (64,740,546)     1,531,771      2,738,037    (40,445,948)

Net assets available for plan benefits:
   Beginning of year                                       12,965,925    293,326,723      5,366,413      9,192,815    426,958,797
                                                           ----------    -----------      ---------     ----------    -----------

   End of year                                             13,387,710    228,586,177      6,898,184     11,930,852    386,512,849
                                                           ==========    ===========      =========     ==========    ===========


See accompanying notes to financial statements.
</TABLE>
                                4

<PAGE>
<PAGE>

<TABLE>
                                       MERCANTILE BANCORPORATION INC.
                                HORIZON INVESTMENT AND SAVINGS PLAN AND TRUST

                       Statement of Changes in Net Assets Available for Plan Benefits

                                        Year ended December 31, 1997
<CAPTION>
                                                                                   PARTICIPANT-DIRECTED FUNDS
                                                            ---------------------------------------------------------------------
                                                                                           GROWTH        GOVERNMENT
                                                             GROWTH                         AND             AND          MONEY
                                                             EQUITY        BALANCED        INCOME        CORPORATE       MARKET
                                                              FUND           FUND           FUND         BOND FUND        FUND
                                                            ---------     ----------     ----------      ----------     ---------
<S>                                                        <C>            <C>            <C>             <C>           <C>
Additions:
   Contributions from:
     Employer                                              $       --             --             --             --             --
     Participants                                               2,387      1,755,877      4,354,171        571,115        888,576
                                                           ----------     ----------     ----------      ---------     ----------

           Total contributions                                  2,387      1,755,877      4,354,171        571,115        888,576
                                                           ----------     ----------     ----------      ---------     ----------

   Earnings on investments:
     Interest:
       Interest-bearing cash (including money market
         funds)                                                   411          2,600          4,664          1,436        586,842
       Certificates of deposit                                     --             --             --             --            737
       Loans to participants                                       --             --             --             --             --
                                                           ----------     ----------     ----------      ---------     ----------

           Total interest                                         411          2,600          4,664          1,436        587,579

     Common stock dividends                                        --             --             --             --             --
     Net appreciation in fair value of
       investments in common stock                                 --             --             --             --             --
     Net investment appreciation (depreciation) in fair
       value of investments in registered investment
       companies                                              (25,404)     4,169,602     10,259,961        672,878             --
     Other income                                                  --          5,648         17,772             59             --
                                                           ----------     ----------     ----------      ---------     ----------

           Total earnings on investments                      (24,993)     4,177,850     10,282,397        674,373        587,579
                                                           ----------     ----------     ----------      ---------     ----------

           Total additions                                    (22,606)     5,933,727     14,636,568      1,245,488      1,476,155
                                                           ----------     ----------     ----------      ---------     ----------

Deductions:
   Administrative expenses                                        341         22,307         36,355          8,455         11,021
   Benefit payments to participants or beneficiaries          325,072      2,486,574      3,080,210        812,541      1,867,589
                                                           ----------     ----------     ----------      ---------     ----------

           Total deductions                                   325,413      2,508,881      3,116,565        820,996      1,878,610
                                                           ----------     ----------     ----------      ---------     ----------

           Net increase (decrease) in net assets
             available for plan benefits prior to
             transfers                                       (348,019)     3,424,846     11,520,003        424,492       (402,455)

Transfers to the Plan                                       4,331,323      1,215,320      2,516,976        546,464      3,943,976
Interfund transfers, net                                      333,068       (571,526)      (389,861)       218,695        554,764
                                                           ----------     ----------     ----------      ---------     ----------

           Net increase in net assets
             available for plan benefits                    4,316,372      4,068,640     13,647,118      1,189,651      4,096,285

Net assets available for plan benefits:
   Beginning of year                                               --     23,812,835     36,982,832      8,041,623      9,951,565
                                                           ----------     ----------     ----------      ---------     ----------

   End of year                                             $4,316,372     27,881,475     50,629,950      9,231,274     14,047,850
                                                           ==========     ==========     ==========      =========     ==========

<PAGE>
<CAPTION>
                                                                 PARTICIPANT-DIRECTED FUNDS
                                                          -----------------------------------------
                                                                                                          NONPAR-
                                                           SMALL CAP     MERCANTILE        INTER-        TICIPANT-
                                                            EQUITY         STOCK          NATIONAL       DIRECTED
                                                             FUND           FUND            FUND           FUNDS         TOTAL
                                                          -----------    -----------      ---------      ---------    -----------
<S>                                                        <C>           <C>              <C>            <C>          <C>
Additions:
   Contributions from:
     Employer                                                      --     10,821,114             --          3,799     10,824,913
     Participants                                           1,959,909      4,146,377        961,615            848     14,640,875
                                                           ----------    -----------      ---------      ---------    -----------

           Total contributions                              1,959,909     14,967,491        961,615          4,647     25,465,788
                                                           ----------    -----------      ---------      ---------    -----------

   Earnings on investments:
     Interest:
       Interest-bearing cash (including money market
         funds)                                                 2,040         39,606          1,250        152,038        790,887
       Certificates of deposit                                     --             --             --             --            737
       Loans to participants                                       --             --             --        783,730        783,730
                                                           ----------    -----------      ---------      ---------    -----------

           Total interest                                       2,040         39,606          1,250        935,768      1,575,354

     Common stock dividends                                        --      4,704,859             --         32,515      4,737,374
     Net appreciation in fair value of
       investments in common stock                                 --    113,817,305             --      1,561,769    115,379,074
     Net investment appreciation (depreciation) in fair
       value of investments in registered investment
       companies                                            2,121,670             --        156,711        493,317     17,848,735
     Other income                                               2,905              1            883        208,342        235,610
                                                           ----------    -----------      ---------      ---------    -----------

           Total earnings on investments                    2,126,615    118,561,771        158,844      3,231,711    139,776,147
                                                           ----------    -----------      ---------      ---------    -----------

           Total additions                                  4,086,524    133,529,262      1,120,459      3,236,358    165,241,935
                                                           ----------    -----------      ---------      ---------    -----------

Deductions:
   Administrative expenses                                     10,733        145,745          3,914          5,285        244,156
   Benefit payments to participants or beneficiaries          789,301     15,883,396        349,836      3,767,103     29,361,622
                                                           ----------    -----------      ---------      ---------    -----------

           Total deductions                                   800,034     16,029,141        353,750      3,772,388     29,605,778
                                                           ----------    -----------      ---------      ---------    -----------

           Net increase (decrease) in net assets
             available for plan benefits prior to
             transfers                                      3,286,490    117,500,121        766,709       (536,030)   135,636,157

Transfers to the Plan                                         640,946     41,887,472        518,459         74,300     55,675,236
Interfund transfers, net                                   (1,006,118)      (927,908)        74,924      1,713,962             --
                                                           ----------    -----------      ---------      ---------    -----------

           Net increase in net assets
             available for plan benefits                    2,921,318    158,459,685      1,360,092      1,252,232    191,311,393

Net assets available for plan benefits:
   Beginning of year                                       10,044,607    134,867,038      4,006,321      7,940,583    235,647,404
                                                           ----------    -----------      ---------      ---------    -----------

   End of year                                             12,965,925    293,326,723      5,366,413      9,192,815    426,958,797
                                                           ==========    ===========      =========      =========    ===========

See accompanying notes to financial statements.
</TABLE>
                                5


<PAGE>
<PAGE>

                   MERCANTILE BANCORPORATION INC.
           HORIZON INVESTMENT AND SAVINGS PLAN AND TRUST

                   Notes to Financial Statements

                    December 31, 1998 and 1997


(1)  DESCRIPTION OF THE PLAN

     The following description of the Plan provides only general
     information. Interested parties should refer to the plan document
     for a more complete description of the Plan's provisions.

          GENERAL

          The Plan, which was adopted in 1969, is a defined
          contribution plan which covers all employees of Mercantile
          who have completed one year of eligible service or employees
          with an account balance resulting from a qualified rollover.
          The Plan is subject to the provisions of ERISA and
          structured to incorporate the provisions available under
          Section 401(k) of the Internal Revenue Code, which allows
          member and sponsor contributions to be excluded from federal
          and state income taxation within certain prescribed limits.
          The Plan Administrator, appointed by the Mercantile Board of
          Directors, manages and directs the operation of the Plan.

          CONTRIBUTIONS

          Each participant may contribute 1% to 15% of their annual
          compensation (subject to federal limits) and may elect to
          have their contributions invested and allocated earnings
          reinvested to their account in the following separate
          investment funds within the Plan:

          *    Growth Equity Fund, which invests in the Arch Growth
               Equity Portfolio. The Arch Growth Equity Portfolio is
               a mutual fund that invests in common stocks of proven
               mid-to-large-sized companies.

          *    Balanced Fund, which invests in the Arch Balanced
               Portfolio. The Arch Balanced Portfolio is a mutual
               fund that invests in fixed-income securities and
               equity securities.

          *    Growth and Income Fund, which invests in the Arch
               Growth and Income Equity Portfolio. The Arch Growth
               and Income Equity Portfolio is a mutual fund that
               primarily invests in broadly diversified equity
               securities.

          *    Government and Corporate Bond Fund, which invests in
               the Arch Government and Corporate Bond Portfolio. The
               Arch Government and Corporate Bond Portfolio is a
               mutual fund that primarily invests in debt obligations
               with maturity dates of one year or more.

          *    Money Market Fund, which invests in the Arch Money
               Market Portfolio Trust Shares. The Arch Money Market
               Portfolio Trust Shares is a mutual fund that primarily
               invests in fixed income obligations with maturity
               dates of less than one year.

          *    Small Cap Equity Fund which invests in the Arch Small
               Cap Equity Portfolio. The Arch Small Cap Equity
               Portfolio is a mutual fund that invests in common
               stocks of emerging or established small-to-medium-
               sized companies.

          *    Mercantile Stock Fund, which invests in the common
               stock of Mercantile.


                               6                         (Continued)




<PAGE>
<PAGE>

                 MERCANTILE BANCORPORATION INC.
          HORIZON INVESTMENT AND SAVINGS PLAN AND TRUST

               Notes to Financial Statements

                 December 31, 1998 and 1997

          *    International Fund, which invests in the Arch
               International Equity Portfolio. The Arch International
               Equity Portfolio is a mutual fund that invests in a
               diversified portfolio of international stocks.

          Subject to the provisions of the Plan prior to January 1,
          1998, each participant is eligible to receive employer
          contributions. Mercantile's contribution has both a matching
          and incentive component. As a matching component, Mercantile
          contributes 50% of a participant's contribution up to a
          maximum employer contribution equal to 3% of a participant's
          salary. Mercantile's incentive contribution is based on a
          formula using a return-on-assets ratio. Incentive
          contributions cannot exceed 6% of the total compensation
          paid to participants during a plan year. Both the matching
          and the incentive contributions are invested in the
          Mercantile Stock Fund. The plan document was amended and
          restated effective January 1, 1998. Beginning January 1,
          1998, Mercantile contributes 100% of a participant's
          contribution up to an employer contribution equal to 3% of a
          participant's salary plus 50% of a participant's
          contribution up to an employer contribution equal to the
          next 3% of a participant's salary. Mercantile's incentive
          component is no longer applicable effective January 1, 1998.

          PARTICIPANT ACCOUNTS

          Each participant account is credited with the participant's
          contribution, an allocation of employer contributions, and
          an allocation of plan earnings net of administrative
          expenses. Allocations are based on participant compensation
          or account balances, as defined in the plan document. The
          benefit to which a participant is entitled is the benefit
          that can be provided from the participant's account.

          NONPARTICIPANT-DIRECTED FUNDS

          Included in nonparticipant-directed funds are a Loan Fund,
          Insurance Fund, several temporary funds, and Suspense Fund.
          The Loan Fund allows participating employees to borrow
          money, within specified limits, in the form of interest-
          bearing promissory notes from the Plan to be repaid over a
          period not to exceed five years for general loans or 10
          years for mortgage loans. The Insurance Fund relates only to
          certain employees who were merged into the Plan via
          acquisition activity. The Insurance Fund provides for the
          payment of a participant's life insurance premiums via pre-
          tax contributions. The temporary funds capture and
          distribute assets received from plans merged into the Plan.
          The Suspense Fund captures and distributes contributions,
          administrative expenses, and benefit payments to
          participants or beneficiaries.

          VESTING

          Participants are fully vested in their account balances,
          including employer matching and incentive contributions.

          BENEFIT PAYMENTS

          Upon termination of employment, participants with an account
          balance less than $5,000 are paid in a lump sum. Participants
          with an account balance of $5,000 or more, upon

                                7                           (Continued)



<PAGE>
<PAGE>

                  MERCANTILE BANCORPORATION INC.
          HORIZON INVESTMENT AND SAVINGS PLAN AND TRUST

               Notes to Financial Statements

                 December 31, 1998 and 1997

          termination of employment, may elect to be paid the balance
          of their account, either immediately or upon retirement, in
          a lump sum or installments over a period not to exceed 10
          years in accordance with plan provisions.

(2)  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

          BASIS OF ACCOUNTING

          The accompanying financial statements have been prepared on
          an accrual basis, with the exception of benefits which are
          recorded when paid, and present the net assets available for
          plan benefits and changes in those assets. The preparation
          of the accompanying financial statements in conformity with
          generally accepted accounting principles requires the Plan's
          management to make estimates and assumptions that affect the
          reported amounts in the financial statements. Actual results
          could differ from those estimates.

          VALUATION OF INVESTMENTS

          The Plan's investments are stated at current (or fair)
          value. Securities traded on a national securities exchange,
          including Mercantile Bancorporation Inc. common stock, are
          valued at the last reported sales price on the last business
          day of the plan year.

          Interest in registered investment companies represents units
          of participation in Arch Mutual Funds (subsequently renamed
          the Mercantile Mutual Funds effective March 31, 1999).
          Interest-bearing cash represents units of participation in
          the Arch Money Market Portfolio Trust Shares. Units of Arch
          Mutual Funds and Arch Money Market Portfolio Trust Shares
          are valued at quoted market prices which represent the net
          asset value of shares held by the Plan as provided by BYSIS
          Fund Services, the administrator of Arch Funds, Inc.

          Loans to participants represent the unpaid principal of
          employee loans and are valued at cost which approximates
          fair value.

          INVESTMENT TRANSACTIONS

          Investment purchases and sales are recorded on a trade-date
          basis (date the order to buy or sell is executed). The
          realized gains or losses on investments are determined
          principally using the average cost of the individual
          security issue as a basis. Average cost is based on the
          market value of the security at the beginning of the year
          and the acquisition cost of any purchases made during the
          year.

          Interest income is recorded on the accrual basis. Dividends
          are recorded on the ex-dividend date. Uninvested moneys
          within each fund are temporarily invested in the Arch Money
          Market Portfolio Trust Shares.

          COSTS OF PLAN ADMINISTRATION

          Fees and expenses incurred by the Trustee and the Plan's
          management in the administration of the Plan are paid by
          Mercantile and from plan assets. Expenses solely
          attributable to the investment of plan funds are paid from
          plan assets.

                                8                         (Continued)



<PAGE>
<PAGE>

                   MERCANTILE BANCORPORATION INC.
           HORIZON INVESTMENT AND SAVINGS PLAN AND TRUST

                   Notes to Financial Statements

                     December 31, 1998 and 1997

(3)  INVESTMENTS

     The Plan's investments are maintained in a trust fund managed by
     the Trustee on behalf of the Plan. The investments and changes
     therein of this trust fund have been reported to the Plan by the
     Trustee. The following table presents the fair value of
     investments at December 31, 1998 and 1997. Investments that
     represent 5% or more of the Plan's assets are separately
     identified:

<TABLE>
<CAPTION>
                                                                   1998              1997
                                                               ------------       -----------
<S>                                                            <C>                <C>
     Investments at fair value as determined by quoted
         market price:
            Cash equivalents                                   $ 15,065,452        15,971,897
            Interest in registered investment companies:
               Arch Balanced Portfolio                           31,730,033        27,691,361
               Arch Growth and Income Equity Portfolio           60,073,362        50,224,411
               Other                                             38,985,287        31,663,414
            Common stocks -
               Mercantile Bancorporation Inc., 4,983,762
                  and 4,639,165 shares, respectively            229,876,022       285,308,617
                                                               ------------       -----------

                                                                375,730,156       410,859,700

     Investments at estimated fair value                          8,080,326         8,851,315
                                                               ------------       -----------

                     Total investments                         $383,810,482       419,711,015
                                                               ============       ===========
</TABLE>

     During 1998 and 1997, the Plan's investments, exclusive of
     investments in registered investment companies, appreciated
     (depreciated) in fair value as follows:

<TABLE>
<CAPTION>
                                                   1998                           1997
                                        --------------------------       -----------------------
                                         REALIZED      UNREALIZED        REALIZED    UNREALIZED
                                        -----------    -----------       ---------   -----------
<S>                                     <C>            <C>               <C>         <C>
     Net appreciation (depreciation)
         in fair value of investments
         - investments at fair value
         as determined by quoted
         market price - common
         stocks                         $(3,455,111)   (68,698,152)      3,134,261   112,244,813
                                        ===========    ===========       =========   ===========
</TABLE>

                                9                             (Continued)





<PAGE>
<PAGE>


                   MERCANTILE BANCORPORATION INC.
           HORIZON INVESTMENT AND SAVINGS PLAN AND TRUST

                   Notes to Financial Statements

                     December 31, 1998 and 1997

(4)  RECONCILIATION OF FINANCIAL STATEMENTS TO FORM 5500

     The following is a reconciliation of net assets available for plan
     benefits per the financial statements to Form 5500:

<TABLE>
<CAPTION>
                                                                   1998               1997
                                                               ------------       -----------
<S>                                                            <C>                <C>
     Net assets available for plan benefits per the
         financial statements                                  $386,512,849       426,958,797

      Amounts allocated to withdrawing participants              (9,558,213)      (11,122,033)
                                                               ------------       -----------
      Net assets available for plan benefits per the
         Form 5500                                             $376,954,636       415,836,764
                                                               ============       ===========
</TABLE>

     The following is a reconciliation of benefits paid to participants
     per the financial statements to Form 5500:

<TABLE>
<CAPTION>
                                                                   1998               1997
                                                                -----------        ----------
<S>                                                             <C>                <C>
     Benefits paid to participants per the financial
         statements                                             $59,189,614        29,361,622
     Add amounts allocated to withdrawing participants at
         December 31, current year                                9,558,213        11,122,033
     Less amounts allocated to withdrawing participants at
         December 31, prior year                                (11,122,033)       (2,688,173)
                                                                -----------        ----------

     Benefits paid to participants per the Form 5500            $57,625,794        37,795,482
                                                                ===========        ==========
</TABLE>

     Amounts allocated to withdrawing participants are recorded on the
     Form 5500 for benefit claims that have been processed and approved
     for payment prior to December 31 but not yet paid as of that date.

                                10                          (Continued)



<PAGE>
<PAGE>

                   MERCANTILE BANCORPORATION INC.
           HORIZON INVESTMENT AND SAVINGS PLAN AND TRUST

                   Notes to Financial Statements

                     December 31, 1998 and 1997


(5)  TRANSFERS TO THE PLAN

     During 1998 and 1997, the following plans merged into the Plan.
     The mergers were related to Mercantile's corporate acquisitions:

<TABLE>
<CAPTION>
                                                                                            EFFECTIVE                 TOTAL
                                                                                               DATE                PLAN ASSETS
                                                                                        -----------------          -----------
<S>                                                                                     <C>                        <C>
     1998 plan mergers:
         Horizon Bancorp, Inc. Employee Stock
            Ownership & Savings Plan                                                    November 18, 1998          $16,371,803
         Roosevelt Bank Employees' Savings & Profit Sharing Plan                          January 1, 1998           22,335,458
         Kirksville Federal Savings Bank 401(k)
            Plan                                                                          January 1, 1998            2,788,651
         Homecorp, Inc. Employee Stock Ownership
            & 401(k) Plan                                                                    July 1, 1998            1,949,461
                                                                                                                   -----------

               Total transfers to the Plan                                                                         $43,445,373
                                                                                                                   ===========
     1997 plan mergers:
         First Financial Corporation of America
            Profit Sharing Trust                                                          January 1, 1997           $1,718,501
         Peoples State Bank Employee Savings and
            Profit Sharing Plan                                                           January 1, 1997            1,074,608
         Today's Bancorp, Inc. Employees Stock
            Ownership Plan                                                                  March 3, 1997            3,845,310
         Regional Bancshares, Inc. 401(k) Plan                                               July 1, 1997              969,953
         First City National Bank 401(k) Plan                                                July 3, 1997              112,434
         Mark Twain Bancshares, Inc. Savings
            Challenge Plan                                                               November 5, 1997           47,954,430
                                                                                                                   -----------

               Total transfers to the Plan                                                                         $55,675,236
                                                                                                                   ===========
</TABLE>

(6)  RELATED PARTY TRANSACTIONS

     On various dates during 1997, the Plan purchased and sold shares
     of Mercantile common stock at fair value for investment in the
     Plan's Mercantile Stock Fund.

     Certain plan investments are shares of mutual funds managed by
     Mercantile Bank N.A., a wholly owned subsidiary of Mercantile.
     Mercantile Bank N.A. is the trustee of the Plan and, therefore,
     these transactions qualify as party-in-interest transactions.

                                11                          (Continued)




<PAGE>
<PAGE>

                   MERCANTILE BANCORPORATION INC.
           HORIZON INVESTMENT AND SAVINGS PLAN AND TRUST

                   Notes to Financial Statements

                    December 31, 1998 and 1997

(7)  INCOME TAX STATUS

     The Internal Revenue Service has determined and informed
     Mercantile by a letter dated August 7, 1996, that the Plan and
     related trust are designed in accordance with applicable sections
     of the Internal Revenue Code (IRC) and, therefore, are exempt from
     federal income taxes.  The Plan has been amended and restated
     since receiving the tax determination letter.  However, the Plan
     Administrator and the Plan's tax counsel believe that the Plan is
     designed and is currently being operated in compliance with the
     applicable requirements of the IRC.

(8)  PLAN TERMINATION

     While Mercantile has not expressed any intent to terminate the
     Plan or discontinue contributions, it may do so at any time,
     subject to the provisions set forth in ERISA.

(9)  SUBSEQUENT EVENTS (UNAUDITED)

     In September 1998, Mercantile acquired First Financial
     Bancorporation. In conjunction with the acquisition, the First
     National Bank Iowa Salary Reduction Profit Sharing Plan merged
     into the Plan effective January 1999. The fair value of the assets
     merged into the Plan was approximately $6,620,000.

     In August 1998, Mercantile acquired Financial Services Corporation
     of the Midwest. In conjunction with the acquisition, the Rock
     Island Bank Saving Trust Plan merged into the Plan effective
     January 1999.  The fair value of the assets merged into the Plan
     was approximately $5,614,000.

     In July 1998, Mercantile acquired CBT Corporation. In conjunction
     with the acquisition, the CBT Savings and Profit Sharing Plan and
     CBT Money Purchase Pension Plan merged into the Plan effective
     January 1999.  The fair value of the assets merged into the Plan
     was approximately $11,306,000 and $1,863,000, respectively.

     Also in July 1998, Mercantile acquired Firstbank of Illinois Co.
     In conjunction with the acquisition, the First Bank of Illinois
     Profit Sharing Plan, Central Bank Profit Sharing Plan, and Central
     Bank Frozen 401(k) Plan merged into the Plan effective January
     1999. The fair value of the assets merged into the Plan was
     approximately $54,916,000, $4,617,000, and $361,000, respectively.

     On April 30, 1999, a definitive Agreement and Plan of Merger by
     and between Mercantile and Firstar Corporation (Firstar) was
     signed.  Mercantile will merge with and into Firstar in a
     transaction intended to be a tax-free reorganization.  Firstar,
     headquartered in Milwaukee, is a $38 billion-asset bank holding
     company with approximately 720 full-service banking offices in
     Ohio, Wisconsin, Kentucky, Illinois, Indiana, Iowa, Minnesota,
     Tennessee, and Arizona.  The transaction is expected to close in
     the fourth quarter of 1999.

                                12






<PAGE>
<PAGE>
                                                             SCHEDULE 1
<TABLE>

                                           MERCANTILE BANCORPORATION INC.
                                   HORIZON INVESTMENT AND SAVINGS PLAN AND TRUST

                            Item 27a -- Schedule of Assets Held for Investment Purposes

                                                  December 31, 1998
<CAPTION>
    SHARES OR                                                                                               CURRENT
      UNITS                                                                             COST                 VALUE
  --------------                                                                    ------------          -----------
<S>                  <C>                                                            <C>                   <C>
                     Cash equivalents - Arch Money Market Portfolio
  15,065,452<F*>        Trust Shares                                                $ 15,065,452           15,065,452
                                                                                    ------------          -----------
                     Registered investment companies:
     531,876<F*>        Arch International Equity Portfolio                            6,217,130            6,866,521
   1,049,058<F*>        Arch Small Cap Equity Portfolio                               13,361,561           13,333,528
     978,910<F*>        Arch Government and Corporate Bond Portfolio                  10,087,987           10,307,921
   2,639,770<F*>        Arch Balanced Portfolio                                       29,558,414           31,730,033
   3,252,483<F*>        Arch Growth and Income Equity Portfolio                       53,024,965           60,073,362
     437,426<F*>        Arch Growth Equity Portfolio                                   7,586,924            8,477,317
                                                                                    ------------          -----------

                                                                                     119,836,981          130,788,682
                                                                                    ------------          -----------

   4,983,762<F*>     Mercantile Bancorporation Inc. common stock                     106,083,292          229,876,022

                     Loans to participants -- general purpose and residential
   8,066,838           loans (interest rates range from 6.25% to 10.50%)               8,066,838            8,066,838

     150,023         Equitable Life Insurance                                              7,390               13,488
                                                                                    ------------          -----------

                            Total assets held for investment purposes               $249,059,953          383,810,482
                                                                                    ============          ===========

<FN>
<F*>Represents party-in-interest transaction allowable under ERISA regulations.

See accompanying independent auditors' report.
</TABLE>

                                13





<PAGE>
<PAGE>
                                                           SCHEDULE 2

<TABLE>
                                              MERCANTILE BANCORPORATION INC.
                                      HORIZON INVESTMENT AND SAVINGS PLAN AND TRUST

                                     Item 27d -- Schedule of Reportable Transactions

                                              Year ended December 31, 1998
<CAPTION>
                                                                                                                          EXPENSES
                                                                                                                          INCURRED
      IDENTITY OF                                                         PURCHASE       SELLING              LEASE         WITH
     PARTY INVOLVED                   DESCRIPTION OF ASSET                 PRICE          PRICE               RENTAL    TRANSACTION
- -------------------------------  -------------------------------------- ------------   ------------           ------    -----------
<S>                              <C>                                    <C>            <C>                      <C>        <C>
Arch Money Market
  Portfolio Trust Shares   <F*>  Purchases of Arch Money Market
                                   Portfolio Trust Shares               $108,707,611             --             --             --

Arch Money Market
  Portfolio Trust Shares   <F*>  Sales of Arch Money Market
                                   Portfolio Trust Shares                         --    109,644,667             --             --

MTC Master Money Market
  Account                  <F*>  Purchases of MTC Master Money
                                   Market Account                          1,071,095             --             --             --

MTC Master Money Market
  Account                  <F*>  Sales of MTC Master Money Market
                                   Account                                        --      1,071,095             --             --

Mercantile Bancorporation
  Inc.                     <F*>  Purchases of Mercantile Bancorporation
                                   Inc. common stock                      19,454,589             --             --         22,696

Mercantile Bancorporation
  Inc.                     <F*>  Sales of Mercantile Bancorporation
                                   Inc. common stock                              --      2,208,128             --          3,022

Arch Balanced Portfolio    <F*>  Purchases of Arch Balanced Portfolio
                                   shares                                  6,426,903             --             --             --

Arch Balanced Portfolio    <F*>  Sales of Arch Balanced Portfolio
                                   shares                                         --      2,715,462             --             --

Arch Small Capital Equity
  Portfolio                <F*>  Purchases of Arch Small Cap Equity
                                   Portfolio shares                        2,974,451             --             --             --

Arch Small Capital Equity
  Portfolio                <F*>  Sales of Arch Small Cap Equity Portfolio
                                   shares                                         --      1,184,700             --             --

Arch Government and
  Corporate Bond
  Portfolio                <F*>  Purchases of Arch Government and
                                   Corporate Bond Portfolio shares         2,631,410             --             --             --

Arch Government and
  Corporate Bond
  Portfolio                <F*>  Sales of Arch Government and Corporate
                                   Bond Portfolio shares                          --      1,560,300             --             --

Arch International
  Equity Portfolio
  shares                   <F*>  Purchases of Arch International Equity
                                   Portfolio shares                        1,927,996             --             --             --

Arch International
  Equity Portfolio
  shares                   <F*>  Sales of Arch International Equity
                                   Portfolio shares                               --        912,800             --             --

Arch Growth and Income
  Equity Portfolio         <F*>  Purchases of Arch Growth and Income
                                   Equity Portfolio shares                13,470,853             --             --             --

Arch Growth and Income
  Equity Portfolio         <F*>  Sales of Arch Growth and Income
                                   Equity Portfolio shares                        --      5,560,418             --             --

Arch Growth Equity
  Portfolio                <F*>  Purchases of Arch Growth Equity
                                   Portfolio shares                        3,742,849             --             --             --

Arch Growth Equity
  Portfolio                <F*>  Sales of Arch Growth Equity
                                   Portfolio shares                               --        600,500             --             --
                                                                        ============    ===========            ====        =======

<PAGE>
<CAPTION>
                                                                                       CURRENT VALUE
                                                                            COST        OF ASSET ON
        IDENTITY OF                                                          OF         TRANSACTION     NET GAIN
       PARTY INVOLVED                     DESCRIPTION OF ASSET             ASSETS           DATE        OR (LOSS)
- -------------------------------  --------------------------------------  -----------    -----------     ---------
<S>                              <C>                                     <C>            <C>             <C>
Arch Money Market
  Portfolio Trust Shares   <F*>  Purchases of Arch Money Market
                                   Portfolio Trust Shares                108,707,611    108,707,611           --

Arch Money Market
  Portfolio Trust Shares   <F*>  Sales of Arch Money Market
                                   Portfolio Trust Shares                109,644,667    109,644,667           --

MTC Master Money Market
  Account                  <F*>  Purchases of MTC Master Money
                                   Market Account                          1,071,095      1,071,095           --

MTC Master Money Market
  Account                  <F*>  Sales of MTC Master Money Market
                                   Account                                 1,071,095      1,071,095           --

Mercantile Bancorporation
  Inc.                     <F*>  Purchases of Mercantile Bancorporation
                                   Inc. common stock                      19,454,589     19,454,589           --

Mercantile Bancorporation
  Inc.                     <F*>  Sales of Mercantile Bancorporation
                                   Inc. common stock                         242,365      2,208,128     1,965,763

Arch Balanced Portfolio    <F*>  Purchases of Arch Balanced Portfolio
                                   shares                                  6,426,903      6,426,903           --

Arch Balanced Portfolio    <F*>  Sales of Arch Balanced Portfolio
                                   shares                                  2,461,992      2,715,462       253,470

Arch Small Capital Equity
  Portfolio                <F*>  Purchases of Arch Small Cap Equity
                                   Portfolio shares                        2,974,451      2,974,451           --

Arch Small Capital Equity
  Portfolio                <F*>  Sales of Arch Small Cap Equity Portfolio
                                   shares                                  1,249,440      1,184,700       (64,740)

Arch Government and
  Corporate Bond
  Portfolio                <F*>  Purchases of Arch Government and
                                   Corporate Bond Portfolio shares         2,631,410      2,631,410           --

Arch Government and
  Corporate Bond
  Portfolio                <F*>  Sales of Arch Government and Corporate
                                   Bond Portfolio shares                   1,520,335      1,560,300        39,965

Arch International
  Equity Portfolio
  shares                   <F*>  Purchases of Arch International Equity
                                   Portfolio shares                        1,927,996      1,927,996           --

Arch International
  Equity Portfolio
  shares                   <F*>  Sales of Arch International Equity
                                   Portfolio shares                          810,465        912,800       102,335

Arch Growth and Income
  Equity Portfolio         <F*>  Purchases of Arch Growth and Income
                                   Equity Portfolio shares                13,470,853     13,470,853           --

Arch Growth and Income
  Equity Portfolio         <F*>  Sales of Arch Growth and Income
                                   Equity Portfolio shares                 4,850,731      5,560,418       709,687

Arch Growth Equity
  Portfolio                <F*>  Purchases of Arch Growth Equity
                                   Portfolio shares                        3,742,849      3,742,849           --

Arch Growth Equity
  Portfolio                <F*>  Sales of Arch Growth Equity
                                   Portfolio shares                          555,926        600,500        44,574
                                                                         ===========    ===========     =========

<FN>
<F*> Represents party-in-interest transaction allowable under ERISA regulations.


See accompanying independent auditors' report.
</TABLE>

                                14


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