MERCANTILE BANCORPORATION INC
S-4/A, 1997-05-23
NATIONAL COMMERCIAL BANKS
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<PAGE>
 
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MAY 23, 1997
                                                     REGISTRATION NO. 333-25131
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549
                                ---------------
                                AMENDMENT NO. 1
                                      TO
                                   FORM S-4
                            REGISTRATION STATEMENT
                                     UNDER
                          THE SECURITIES ACT OF 1933
                                ---------------
    MERCANTILE BANCORPORATION INC.        MERCANTILE CAPITAL TRUST I
(EXACT NAME OF REGISTRANT AS SPECIFIED
            IN ITS CHARTER)
                                    (EXACT NAME OF REGISTRANT AS SPECIFIED
                                                IN ITS CHARTER)
               MISSOURI                            DELAWARE
    (STATE OR OTHER JURISDICTION OF     (STATE OR OTHER JURISDICTION OF
    INCORPORATION OR ORGANIZATION)      INCORPORATION OR ORGANIZATION)
                 6712                                6719
     (PRIMARY STANDARD INDUSTRIAL        (PRIMARY STANDARD INDUSTRIAL
      CLASSIFICATION CODE NUMBER)         CLASSIFICATION CODE NUMBER)
              43-0951744                          43-1769411
 (I.R.S. EMPLOYER IDENTIFICATION NO.)(I.R.S. EMPLOYER IDENTIFICATION NO.)
             P.O. BOX 524                        P.O. BOX 524
    ST. LOUIS, MISSOURI 63166-0524      ST. LOUIS, MISSOURI 63166-0524
            (314) 425-2525                      (314) 425-2525
   (ADDRESS, INCLUDING ZIP CODE, AND
TELEPHONE NUMBER, INCLUDING AREA CODE,
  OR REGISTRANT'S PRINCIPAL EXECUTIVE
               OFFICES)
                                       (ADDRESS, INCLUDING ZIP CODE, AND
                                    TELEPHONE NUMBER, INCLUDING AREA CODE,
                                      OR REGISTRANT'S PRINCIPAL EXECUTIVE
                                                   OFFICES)
                                ---------------
                             JON W. BILSTROM, ESQ.
                         GENERAL COUNSEL AND SECRETARY
                        MERCANTILE BANCORPORATION INC.
                                 P.O. BOX 524
                        ST. LOUIS, MISSOURI 63166-0524
                                (314) 425-2525
(NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)
                                ---------------
                                  COPIES TO:
            JOHN Q. ARNOLD                     ROBERT M. LAROSE, ESQ.
        CHIEF FINANCIAL OFFICER                    THOMPSON COBURN
    MERCANTILE BANCORPORATION INC.                   SUITE 3400
             P.O. BOX 524                       ONE MERCANTILE CENTER
    ST. LOUIS, MISSOURI 63166-0524            ST. LOUIS, MISSOURI 63101
            (314) 425-2525                         (314) 552-6000
                                ---------------
  APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE OF THE SECURITIES TO THE
PUBLIC: As soon as practicable after the effective date of this Registration
Statement.
  If the securities being registered on this Form are being offered in
connection with the formation of a holding company and there is compliance
with General Instruction G, check the following box. [_]
                        CALCULATION OF REGISTRATION FEE
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                                 PROPOSED
                                                                 PROPOSED         MAXIMUM
                                                AMOUNT           MAXIMUM         AGGREGATE        AMOUNT OF
          TITLE OF EACH CLASS OF                 TO BE        OFFERING PRICE     OFFERING        REGISTRATION
        SECURITIES TO BE REGISTERED           REGISTERED      PER UNIT(/1/)     PRICE(/1/)         FEE(/2/)
- -------------------------------------------------------------------------------------------------------------
<S>                                        <C>                <C>            <C>                <C>
Floating Rate Capital Trust Pass-
 through Securities (TRUPS(TM)) of
 Mercantile Capital Trust I...............    $150,000,000         100%         $150,000,000       $45,455
- -------------------------------------------------------------------------------------------------------------
Floating Rate Junior Subordinated Defer-
 rable
 Interest Debentures due 2027 of Mercan-
 tile
 Bancorporation Inc.(/3/).................         --              --                --              N/A
- -------------------------------------------------------------------------------------------------------------
Mercantile Bancorporation Inc. Guarantee
 with
 respect to Capital Securities(/4/).......         --              --                --              N/A
- -------------------------------------------------------------------------------------------------------------
Total(/5/)................................  $150,000,000(/6/)      100%       $150,000,000(/6/)    $45,455
- -------------------------------------------------------------------------------------------------------------
</TABLE>
- -------------------------------------------------------------------------------
(1) Estimated solely for the purpose of computing the registration fee.
(2) The Registrant previously paid $45,455 with the original filing on April
    14, 1997.
(3) The Junior Subordinated Deferrable Interest Debentures due 2027 (the
    "Subordinated Debt Securities") were originally purchased by Mercantile
    Capital Trust I with the proceeds of the sale of the Capital Trust Pass-
    through Securities (the "Old Capital Securities"). No separate
    consideration will be received for the Subordinated Debt Securities which
    may be distributed upon any liquidation of Mercantile Capital Trust I.
(4) No separate consideration will be received for the Mercantile
    Bancorporation Inc. Guarantee.
(5) This Registration Statement is deemed to cover the Subordinated Debt
    Securities of Mercantile Bancorporation Inc., the rights of holders of
    Subordinated Debt Securities of Mercantile Bancorporation Inc. under the
    Indenture, the rights of holders of Old Capital Securities of Mercantile
    Capital Trust I under an Amended and Restated Declaration of Trust and the
    rights of holders of the Old Capital Securities under the Guarantee.
(6) Such amount represents the initial offering price of the Old Capital
    Securities to be exchanged hereunder and the principal amount of
    Subordinated Debt Securities that may be distributed upon any liquidation
    of Mercantile Capital Trust I.
                                ---------------
  THE REGISTRANTS HEREBY AMEND THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANTS
SHALL FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS
REGISTRATION STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH
SECTION 8(A) OF THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT
SHALL BECOME EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID
SECTION 8(A), MAY DETERMINE.
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>
 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A         +
+REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE   +
+SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY  +
+OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT        +
+BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR   +
+THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE      +
+SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE    +
+UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF  +
+ANY SUCH STATE.                                                               +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
                    
                 SUBJECT TO COMPLETION, DATED MAY 23, 1997     
 
PROSPECTUS
 
                                                                            LOGO
 
                           MERCANTILE CAPITAL TRUST I
 
OFFER TO EXCHANGE ITS FLOATING RATE CAPITAL
TRUST PASS-THROUGH SECURITIESSM
WHICH HAVE BEEN REGISTERED UNDER THE SECURITIES
ACT OF 1933 FOR ANY AND
       
ALL OF ITS OUTSTANDING FLOATING RATE CAPITAL
TRUST PASS-THROUGH SECURITIESSM
     (LIQUIDATION AMOUNT $1,000 PER CAPITAL
                   SECURITY)
    FULLY AND UNCONDITIONALLY GUARANTEED, AS
              DESCRIBED HEREIN, BY
       
                         MERCANTILE BANCORPORATION INC.
 
                                  -----------
 
       THE EXCHANGE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 5:00 P.M.,
             
          NEW YORK CITY TIME, ON JUNE 27, 1997, UNLESS EXTENDED.     
 
                                  -----------
 
  Mercantile Capital Trust I, a trust formed under the laws of the State of
Delaware (the "Trust"), hereby offers, upon the terms and subject to the
conditions set forth in this Prospectus (as the same may be amended or
supplemented from time to time, the "Prospectus") and in the accompanying
Letter of Transmittal (which together constitute the "Exchange Offer"), to
exchange up to $150,000,000 aggregate liquidation amount of its Floating Rate
Capital Trust Pass-through Securitiessm (the "New Capital Securities") which
have been registered under the Securities Act of 1933, as amended (the
"Securities Act"), pursuant to a Registration Statement (as
                                                        (continued on next page)
 
  SEE "RISK FACTORS" COMMENCING ON PAGE 17 FOR INFORMATION THAT SHOULD BE
CONSIDERED BY HOLDERS WHO TENDER OLD CAPITAL SECURITIES (AS HEREINAFTER
DEFINED) IN THE EXCHANGE OFFER.
 
THE SECURITIES OFFERED BY THIS PROSPECTUS  ARE NOT SAVINGS OR DEPOSIT ACCOUNTS,
 ARE NOT OBLIGATIONS OF OR GUARANTEED  BY ANY BANKING OR NON-BANKING AFFILIATE
  OF MERCANTILE  BANCORPORATION INC. (EXCEPT  TO THE EXTENT  THAT NEW CAPITAL
   SECURITIES ARE GUARANTEED BY  MERCANTILE BANCORPORATION INC. AS DESCRIBED
    HEREIN), ARE NOT INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION OR
    ANY  OTHER GOVERNMENT  AGENCY AND  INVOLVE INVESTMENT RISKS,  INCLUDING
     POSSIBLE LOSS OF PRINCIPAL.
 
                                  -----------
 
THESE SECURITIES  HAVE NOT BEEN APPROVED  OR DISAPPROVED BY THE  SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
  AND EXCHANGE COMMISSION OR ANY  STATE SECURITIES COMMISSION PASSED UPON  THE
  ACCURACY  OR ADEQUACY OF  THIS PROSPECTUS. ANY  REPRESENTATION TO THE  CON-
   TRARY IS A CRIMINAL OFFENSE.
 
  The New Capital Securities and the Old Capital Securities (together, the
"Capital Securities"), represent beneficial interests in the Trust. Mercantile
Bancorporation Inc., a Missouri corporation (the "Company" or "MBI"), is the
owner of all of the beneficial interests represented by common securities of
the Trust (as defined herein) (the "Common Securities" and, collectively with
the Capital Securities, the "Trust Securities"). The Chase Manhattan Bank is
the Institutional Trustee of the Trust. The Trust exists for the sole purpose
of issuing the Trust Securities and investing the proceeds thereof in the Old
Subordinated Debt Securities and New Subordinated Debt Securities (together,
the "Subordinated Debt Securities"). The Subordinated Debt Securities will
mature on February 1, 2027.
 
                   The date of this Prospectus is     , 1997.
<PAGE>
 
(Continued from cover page)
 
defined herein) of which this Prospectus constitutes a part, for a like
liquidation amount of its outstanding Floating Rate Capital Trust Pass-through
Securitiessm (the "Old Capital Securities"), of which $150,000,000 aggregate
liquidation amount is outstanding. Pursuant to the Exchange Offer, the Company
is also exchanging its guarantee of the payment of Distributions (as defined
herein) and payments on liquidation or redemption of the Old Capital
Securities (the "Old Guarantee") for a like guarantee of the New Capital
Securities (the "New Guarantee") and all of its Floating Rate Junior
Subordinated Deferrable Interest Debentures due 2027 (the "Old Subordinated
Debt Securities"), of which $154,640,000 aggregate principal amount is
outstanding, for a like aggregate principal amount of its Floating Rate Junior
Subordinated Deferrable Interest Debentures due 2027 (the "New Subordinated
Debt Securities"), which New Guarantee and New Subordinated Debt Securities
also have been registered under the Securities Act. The Old Capital
Securities, the Old Guarantee and the Old Subordinated Debt Securities are
collectively referred to herein as the "Old Securities" and the New Capital
Securities, the New Guarantee and the New Subordinated Debt Securities are
collectively referred to herein as the "New Securities."
 
  The terms of the New Securities are identical in all material respects to
the respective terms of the Old Securities, except that (i) the New Securities
will have been registered under the Securities Act and therefore will not be
subject to certain restrictions on transfer applicable to the Old Securities
and (ii) will not provide for an increase in the Distribution rate thereon.
The New Capital Securities are being offered for exchange in order to satisfy
certain obligations of MBI and the Trust under the Registration Rights
Agreement dated as of January 29, 1997 (the "Registration Rights Agreement")
among MBI, the Trust and Salomon Brothers Inc, as representative of the
Initial Purchasers (as defined herein) of the Old Capital Securities. In the
event that the Exchange Offer is consummated, any Old Capital Securities which
remain outstanding after consummation of the Exchange Offer and the New
Capital Securities issued in the Exchange Offer will vote together as a single
class for purposes of determining whether holders of the requisite percentage
in outstanding liquidation amount thereof have taken certain actions or
exercised certain rights under the Declaration (as defined herein).
 
  The New Subordinated Debt Securities and the New Guarantee when issued will
be an unsecured obligation of the Company and will be subordinate and junior
in right of payment to other indebtedness of the Company, as described herein.
Upon an event of default under the Declaration in respect of the Trust, the
holders of Capital Securities issued by the Trust will have a preference over
the holders of the Common Securities of the Trust with respect to payments in
respect of Distributions and payments upon redemption, liquidation and
otherwise.
 
  Holders of the Capital Securities are entitled to receive cumulative cash
Distributions accruing from the date of original issuance of the Old Capital
Securities, and (subject to the extensions of distribution payment periods
described below) payable quarterly in arrears on the first day of February,
May, August and November of each year, commencing May 1, 1997, at a variable
annual rate equal to LIBOR (as defined herein) plus 0.85% on the liquidation
amount of $1,000 per Capital Security ("Distributions"). The payment of
Distributions on the Capital Securities out of moneys held by the Trust and
payments on liquidation of the Trust or the redemption of the Capital
Securities, as set forth below, are guaranteed by the Company (the
"Guarantee") as described herein. The Guarantee covers payments of
Distributions and other payments on the Capital Securities only if and to the
extent that the Trust has funds available therefor, which funds will not be
available except to the extent the Company has made payments of interest or
principal or other payments on the Subordinated Debt Securities held by the
Trust.
 
  The Guarantee, when taken together with the Company's obligations under the
Subordinated Debt Securities, the Declaration and the Indenture (as defined
herein), including the Company's obligations to pay costs, expenses, debts and
other obligations of the Trust (other than with respect to the Trust
Securities), provides a full and unconditional guarantee on a subordinated
basis by the Company of amounts due on the Capital Securities. See "Risk
Factors--Guarantee Covers Distributions and Other Payments Only to the Extent
the Trust Has Available Funds; Related Remedies." The obligations of the
Company under the Guarantee and the Subordinated Debt Securities are
subordinate and junior in right of payment to all present and future Senior
 
                                       2
<PAGE>
 
(Continued from cover page)
Indebtedness (as defined herein) of the Company and are also effectively
subordinate to claims of creditors of the Company's subsidiaries. As of
December 31, 1996, the Company had approximately $78 million of Senior
Indebtedness. There are no terms in the Subordinated Debt Securities, the
Capital Securities or the Guarantee that limit the ability of the Company or
its subsidiaries to incur additional indebtedness, liabilities and
obligations, including such indebtedness that ranks senior to the Subordinated
Debt Securities and the Guarantee. The holders of the Common Securities will
be entitled to receive distributions upon any liquidation of the Trust pro
rata with the holders of the Capital Securities, except that if a Declaration
Event of Default (as defined herein) has occurred and is continuing, the
Capital Securities shall have a preference over the Common Securities.
 
  The distribution rate and the distribution payment dates and other payment
dates for the Capital Securities will correspond to the interest rate and
interest payment dates and other payment dates on the Subordinated Debt
Securities held by the Trust, which are the sole assets of the Trust. As a
result, if no principal or interest is paid on the Subordinated Debt
Securities, the Trust will not have sufficient funds to make distributions on
the Capital Securities, and the Guarantee will not apply for distributions for
which the Trust has insufficient funds available.
 
  The Company has the right, subject to the conditions set forth herein, to
defer payments of interest on the Subordinated Debt Securities by extending
the interest payment period on such Subordinated Debt Securities at any time
and from time to time for up to 20 consecutive quarterly periods (each such
extended interest payment period, an "Extension Period"), provided that no
Extension Period may extend beyond the maturity of the Subordinated Debt
Securities. If interest payments are so deferred, distributions on the Capital
Securities and the Common Securities will also be deferred and the Company
(subject to certain exceptions set forth herein) will not be permitted to
declare or pay any such distributions with respect to the Company's capital
stock (which currently consists of common shares) or to make any payment with
respect to debt securities of the Company that rank pari passu with or junior
to the Subordinated Debt Securities. During any such Extension Period,
interest will continue to accrue on the Subordinated Debt Securities (and the
amount of distributions to which holders of the Capital Securities are
entitled will accumulate) at a variable annual rate equal to LIBOR plus 0.85%
for United States federal income tax purposes in respect of such deferred
interest. As a result, during any Extension Period, holders of the Capital
Securities will be required to include the deferred amounts in their gross
income for United States federal income tax purposes in advance of receipt of
cash Distributions with respect to such deferred interest payments. There
could be multiple Extension Periods of varying lengths, each up to 20
consecutive quarterly periods, throughout the term of the Subordinated Debt
Securities. See "Description of the Subordinated Debt Securities--Option to
Extend Interest Payment Period," "Risk Factors--Option to Extend Interest
Payment Period for Up to Five Years and Consequent Deferral of Distributions
on Capital Securities" and "United States Federal Income Taxation--US
Holders--Original Issue Discount."
 
  The Subordinated Debt Securities are redeemable by the Company at par, plus
accrued and unpaid interest to the date of redemption, in whole or in part, at
any time and from time to time, on or after February 1, 2007. In addition, in
certain circumstances described herein, upon the occurrence and continuation
of a Tax Event or a Capital Treatment Event (each as defined herein), the
Subordinated Debt Securities also are redeemable by the Company at any time,
within 90 days of the occurrence of such Tax Event or Capital Treatment Event,
in whole or in part, at par, together with accrued and unpaid interest thereon
to the date of the redemption. Any redemption prior to maturity is subject to
the Company having received prior approval from the Board of Governors of the
Federal Reserve System (the "Federal Reserve"), if then required under
applicable capital guidelines or policies of the Federal Reserve. Upon
redemption by the Company or at maturity of the Subordinated Debt Securities,
the Trust must redeem on a pro rata basis its Trust Securities having an
aggregate liquidation amount equal to the aggregate principal amount of the
Subordinated Debt Securities so redeemed or matured at a redemption price
equal to $1,000 per Trust Security, plus accrued and unpaid Distributions on
such Trust Securities to the date fixed for redemption (the "Redemption
Price"). See "Description of the Capital Securities--Redemption." The Capital
Securities will be redeemed upon maturity of the Subordinated Debt Securities,
whereupon the Trust will be dissolved. See "Description of the Subordinated
Debt Securities."
 
                                       3
<PAGE>
 
(Continued from cover page)
 
  The Company, as the holder of all of the outstanding Common Securities, has
the right at any time, subject to the receipt of prior approval by the Federal
Reserve if then required under applicable capital guidelines or policies of
the Federal Reserve, to dissolve the Trust (including, without limitation,
upon the occurrence of a Tax Event or a Capital Treatment Event) and, after
satisfaction of liabilities to creditors of the Trust (to the extent not
satisfied by the Company), the Subordinated Debt Securities must be
distributed to the holders of the Trust Securities, on a pro rata basis, in
accordance with the aggregate stated liquidation amount thereof, in
liquidation of the Trust.
 
  In the event of the voluntary or involuntary dissolution of the Trust, other
than in connection with a redemption or the maturity of the Subordinated Debt
Securities as described above, after satisfaction of liabilities to creditors
of the Trust (to the extent not satisfied by the Company), the holders of the
Capital Securities generally will be entitled to receive the stated
liquidation amount thereof plus accrued and unpaid distributions thereon to
the date of payment, unless, in connection with such dissolution, the
Subordinated Debt Securities held by the Trust are distributed to the holders
of the Trust Securities issued by the Trust as would be required in certain
circumstances. See "Description of the Capital Securities--Liquidation
Distribution Upon Dissolution."
 
  The Capital Securities and the Subordinated Debt Securities will be issued
and may be transferred only in blocks having a stated liquidation amount or an
aggregate principal amount, as the case may be, of not less than $100,000 (100
Capital Securities). See "Description of the Capital Securities--Restrictions
on Transfer" and "Description of the Subordinated Debt Securities--
Restrictions on Transfer."
 
  Neither the Capital Securities nor the Subordinated Debt Securities will be
listed on a national securities exchange or quoted on an inter-dealer
quotation service after the Exchange Offer.
 
  Based on interpretations by the staff of the Securities and Exchange
Commission (the "Commission"), as set forth in no-action letters issued to
third parties, the Company and the Trust believe that the New Capital
Securities issued pursuant to the Exchange Offer may be offered for resale,
resold or otherwise transferred by holders thereof (other than any holder that
is an "affiliate" of the Company or the Trust as defined under Rule 405 of the
Securities Act) without compliance with the registration and prospectus
delivery provisions of the Securities Act, provided that such New Capital
Securities are acquired in the ordinary course of such holders' business and
such holders are not engaged in, and do not intend to engage in, a
distribution of such New Capital Securities and have no arrangement or
understanding with any person to participate in the distribution of such New
Capital Securities. However, the staff of the Commission has not considered
the Exchange Offer in the context of a no-action letter, and there can be no
assurance that the staff of the Commission would make a similar determination
with respect to the Exchange Offer as in such other circumstances. By
tendering the Old Capital Securities in exchange for New Capital Securities,
each holder, other than a broker-dealer, will represent to the Company and the
Trust that: (i) it is not an affiliate of either the Company or the Trust (as
defined under Rule 405 of the Securities Act); (ii) any New Capital Securities
to be received by it were acquired in the ordinary course of its business; and
(iii) it is not engaged in, and does not intend to engage in, a distribution
of the New Capital Securities and has no arrangement with any person to
participate in the distribution (within the meaning of the Securities Act) of
the New Capital Securities.
 
  Each broker-dealer that receives New Capital Securities for its own account
pursuant to the Exchange Offer must acknowledge that it will deliver a
prospectus in connection with any resale of such New Capital Securities. The
Letter of Transmittal states that by so acknowledging and by delivering a
prospectus, a broker-dealer will not be deemed to admit that it is an
"underwriter" within the meaning of the Securities Act. This Prospectus, as it
may be amended or supplemented from time to time, may be used by a broker-
dealer in connection with resales of New Capital Securities received in
exchange for Old Capital Securities where such Old Capital Securities were
acquired by such broker-dealer as a result of market-making activities or
other trading activities. The Company and the Trust have agreed that, starting
on the date on which the Exchange Offer is consummated and
 
                                       4
<PAGE>
 
(Continued from cover page)
ending on the close of business one year after such date, they will make this
Prospectus available to any broker-dealer for use in connection with any such
resale. See "Plan of Distribution."
 
  THIS PROSPECTUS AND THE RELATED LETTER OF TRANSMITTAL CONTAIN IMPORTANT
INFORMATION. HOLDERS OF OLD CAPITAL SECURITIES ARE URGED TO READ THIS
PROSPECTUS AND THE RELATED LETTER OF TRANSMITTAL CAREFULLY BEFORE DECIDING
WHETHER TO TENDER THEIR OLD CAPITAL SECURITIES PURSUANT TO THE EXCHANGE OFFER.
   
  Old Capital Securities may be tendered for exchange on or prior to 5:00
p.m., New York City time, on June 27, 1997 (such time on such date being
hereinafter called the "Expiration Date"), unless the Exchange Offer is
extended by MBI and the Trust (in which case the term "Expiration Date" shall
mean the latest date and time to which the Exchange Offer is extended).
Tenders of Old Capital Securities may be withdrawn at any time on or prior to
the Expiration Date. The Exchange Offer is not conditioned upon any minimum
liquidation amount of Old Capital Securities being tendered for exchange.
However, the Exchange Offer is subject to certain events and conditions which
may be waived by MBI or the Trust and to the terms and provisions of the
Registration Rights Agreement. Old Capital Securities may be tendered in whole
or in part having a liquidation amount of not less than $100,000 (100 Capital
Securities) and any integral multiple of $1,000 liquidation amount (1 Capital
Security) in excess thereof. MBI has agreed to pay all expenses of the
Exchange Offer. See "The Exchange Offer--Fees and Expenses." Each New Capital
Security will pay cumulative Distributions from the most recent Distribution
Date (as defined below) on the Old Capital Securities surrendered in exchange
for such New Capital Securities or, if no Distributions have been paid on such
Old Capital Securities, from February 4, 1997. Holders of the Old Capital
Securities whose Old Capital Securities are accepted for exchange will not
receive accumulated Distributions on such Old Capital Securities for any
period from and after the last Distribution Date on such Old Capital
Securities prior to the original issue date of the New Capital Securities or,
if no such Distributions have been paid, will not receive any accumulated
Distributions on such Old Capital Securities, and will be deemed to have
waived the rights to receive any Distributions on such Old Capital Securities
accumulated from and after such Distribution Date or, if no such Distributions
have been paid or duly provided for, from and after February 4, 1997. This
Prospectus, together with the Letter of Transmittal, is being sent to all
registered holders of Old Capital Securities as of May 28, 1997.     
 
  Neither MBI nor the Trust will receive any cash proceeds from the issuance
of the New Capital Securities offered hereby. No dealer-manager is being used
in connection with this Exchange Offer. See "Use of Proceeds" and "Plan of
Distribution."
 
                                       5
<PAGE>
 
                             AVAILABLE INFORMATION
 
  MBI is subject to the informational requirements of the Securities Exchange
Act of 1934, as amended (the "Exchange Act"), and, in accordance therewith,
files with the Commission reports, proxy statements and other information.
Such reports, proxy statements and other information filed with the Commission
by MBI can be inspected and copied at the public reference facilities
maintained by the Commission at 450 Fifth Street, N.W., Washington, D.C. 20549
and at the Commission's regional offices located at Suite 1300, Seven World
Trade Center, New York, New York 10048 and Suite 1400, Citicorp Center, 500
West Madison Street, Chicago, Illinois 60661. The Commission maintains an
Internet site on the World Wide Web containing reports, proxy and information
statements and other information filed electronically by MBI with the
Commission. The address of the World Wide Web site maintained by the
Commission is http://www.sec.gov. MBI Common Stock is listed on the New York
Stock Exchange (the "NYSE"), and such reports, proxy statements and other
information concerning MBI are available for inspection and copying at the
offices of the NYSE, 20 Broad Street, New York, New York 10005.
 
  No separate financial statements of the Trust have been included herein. The
Company and the Trust do not consider that such financial statements would be
material to holders of the Capital Securities because the Trust is a newly
formed special purpose entity, has virtually no operating history or
independent operations and is not engaged in and does not propose to engage in
any activity other than holding as trust assets the Subordinated Debt
Securities and issuing the Trust Securities. See "Mercantile Capital Trust I,"
"Description of the Capital Securities," "Description of the Subordinated Debt
Securities" and "Description of the Guarantee." In addition, the Company does
not expect that the Trust will file reports under the Exchange Act with the
Commission.
 
  This Prospectus constitutes a part of a registration statement on Form S-4
(the "Registration Statement") filed by the Company and the Trust with the
Commission under the Securities Act. This Prospectus does not contain all the
information set forth in the Registration Statement, certain parts of which
are omitted in accordance with the rules and regulations of the Commission,
and reference is hereby made to the Registration Statement and to the exhibits
relating thereto for further information with respect to the Company and the
Capital Securities. Any statements contained herein concerning the provisions
of any document are not necessarily complete, and, in each instance, reference
is made to the copy of such document filed as an exhibit to the Registration
Statement or otherwise filed with the Commission. Each such statement is
qualified in its entirety by such reference.
 
               INCORPORATION OF CERTAIN INFORMATION BY REFERENCE
   
  THIS PROSPECTUS INCORPORATES BY REFERENCE DOCUMENTS RELATING TO MBI WHICH
ARE NOT PRESENTED HEREIN OR DELIVERED HEREWITH. IN ADDITION, THIS PROSPECTUS
INCORPORATES BY REFERENCE DOCUMENTS RELATING TO ROOSEVELT FINANCIAL GROUP,
INC. ("ROOSEVELT"), A DELAWARE CORPORATION AND SAVINGS AND LOAN HOLDING
COMPANY, WHICH RECENTLY ENTERED INTO A DEFINITIVE AGREEMENT WITH MBI TO BE
ACQUIRED BY MBI. SUCH DOCUMENTS, EXCLUDING EXHIBITS UNLESS SPECIFICALLY
INCORPORATED THEREIN, ARE AVAILABLE WITHOUT CHARGE TO ANY PERSON TO WHOM THIS
PROSPECTUS IS DELIVERED, UPON WRITTEN OR ORAL REQUEST, TO JON W. BILSTROM,
GENERAL COUNSEL AND SECRETARY, MERCANTILE BANCORPORATION INC., P.O. BOX 524,
ST. LOUIS, MISSOURI 63166-0524, TELEPHONE (314) 425-2525. IN ORDER TO ENSURE
TIMELY DELIVERY OF THE DOCUMENTS, ANY REQUEST SHOULD BE MADE BY JUNE 20, 1997.
       
  The following documents filed with the Commission by MBI under the Exchange
Act are incorporated herein by reference:     
     
  (i) Annual Report on Form 10-K for the year ended December 31, 1996;     
     
  (ii) Quarterly Report on Form 10-Q for the quarter ended March 31, 1997;
              
  (iii) Current Reports on Form 8-K dated May 2, 1997 and May 13, 1997 and
        Current Report on Form 8-K/A dated May 22, 1997; and     
     
  (iv) Amendment No. 1 to MBI's Registration Statement on Form S-4 (File No.
       333-25131), filed on May 19, 1997.     
 
                                       6
<PAGE>
 
   
  The following document filed with the Commission by Roosevelt under the
Exchange Act is incorporated herein by reference: Annual Report on Form 10-K
for the year ended December 31, 1996, as amended on Form 10-K/A on March 14,
1997 and on Form 10-K/A-2 on April 29, 1997.     
   
  All documents filed by MBI and Roosevelt pursuant to Sections 13(a), 13(c),
14 and 15(d) of the Exchange Act after the date hereof and prior to the
termination of the Exchange Offer shall be deemed to be incorporated by
reference herein and made a part hereof from the date any such document is
filed. The information relating to MBI and Roosevelt contained in this
Prospectus does not purport to be complete and should be read together with
the information in the documents incorporated by reference herein. Any
statement contained herein or in a document incorporated herein by reference
shall be deemed to be modified or superseded for purposes hereof to the extent
that a subsequent statement contained herein or in any other subsequently
filed document incorporated by reference herein modifies or supersedes such
statement. Any such statement so modified or superseded shall not be deemed,
except as so modified or superseded, to constitute a part hereof. Any
statements contained in this Prospectus involving matters of opinion, whether
or not expressly so stated, are intended as such and not as representations of
fact.     
 
  As used herein, the terms "Prospectus" and "herein" mean this Prospectus,
including such documents incorporated or deemed to be incorporated herein by
reference, as the same may be amended, supplemented or otherwise modified from
time to time. Statements contained in this Prospectus as to the contents of
any contract or other document referred to herein do not purport to be
complete, and where reference is made to the particular provisions of such
contract or other document, such provisions are qualified in all respect by
reference to all of the provisions of such contract or other document.
 
                                       7
<PAGE>
 
                                    SUMMARY
 
  The following summary is qualified in its entirety by, and should be read in
conjunction with, the more detailed information and the financial statements,
including the notes thereto, appearing elsewhere or incorporated by reference
herein. Prospective investors should consider carefully the factors set forth
herein under "Risk Factors." As used in this Prospectus, the "Company" includes
Mercantile Bancorporation Inc. and its respective predecessors and
subsidiaries, except as the context otherwise may require.
 
                         MERCANTILE BANCORPORATION INC.
   
  The Company is a registered bank holding company headquartered in St. Louis,
Missouri and was incorporated under the laws of the State of Missouri in 1970.
At March 31, 1997, the Company, directly or through its subsidiaries, owned all
of the capital stock of Mercantile Bank National Association, based in
St. Louis, Missouri and 27 other commercial banks and one federally chartered
thrift, all of which operate from 467 banking offices and 427 Fingertip Banking
automated teller machines located throughout Missouri, Illinois, Iowa, Arkansas
and eastern Kansas.     
 
  The Company's services concentrate in three major lines of business--
consumer, corporate and trust and investment advisory services. The Company
also operates non-banking subsidiaries that provide related financial services,
including investment management, brokerage services and asset-based lending.
   
  The Company has one acquisition transaction currently pending; the proposed
acquisition of Roosevelt, which is headquartered in St. Louis, Missouri. For
further information regarding the pending acquisition of Roosevelt, see "Recent
Developments."     
 
  The Company is a legal entity separate and distinct from Mercantile Bank
National Association and the Company's other banking subsidiaries
(collectively, the "Banking Subsidiaries") and affiliates. Because the Company
is a bank holding company, its rights and the rights of its creditors and
shareholders, including the holders of its Subordinated Debt Securities and the
Guarantee, to participate in the assets of any subsidiary upon its liquidation
or recapitalization will be subject to the prior claims of such subsidiary's
creditors except to the extent that the Company may itself be a creditor having
recognized claims against such subsidiary, in which case it will share in such
subsidiary's assets along with other creditors.
 
  There are various legal and regulatory limitations on the extent to which the
Company's Banking Subsidiaries may extend credit, pay dividends or otherwise
supply funds to the Company. The approval of the Office of the Comptroller of
the Currency (the "OCC") is required if total dividends declared by a national
bank in any calendar year should exceed net profits for that year combined with
its retained net profits for the preceding two years. Moreover, banks may not
pay dividends in excess of their undivided profits. In determining whether and
to what extent to pay dividends, each Banking Subsidiary must also consider the
effect of dividend payments on applicable risk-based capital and leverage
requirements as well as policy statements of the federal regulatory agencies to
the effect that, generally, banking organizations should pay dividends out of
current operating earnings. The Company's state-chartered Banking Subsidiaries
are subject to similar restrictions under their respective state laws. While
the specific standards vary from state to state, the Company's Banking
Subsidiaries are generally permitted to pay dividends only from net profits,
and then, only after first deducting losses and credit write-offs. All of the
applicable state statutes prohibit the payment of dividends if such a payment
would impair capital. In addition there are numerous governmental requirements
and regulations that affect the activities of the Company and its bank and non-
bank subsidiaries. See the discussion in Part 1, Item 1 of the Company's Form
10-K for the year ended December 31, 1996 under the caption "Supervision and
Regulation."
 
  The principal executive offices of the Company are located at One Mercantile
Center, P.O. Box 524, St. Louis, MO 63166-0524 (telephone number (314) 425-
2525).
 
                                       8
<PAGE>
 
 
                           MERCANTILE CAPITAL TRUST I
 
  The Trust is a statutory business trust created under Delaware law pursuant
to (i) a declaration of trust dated as of January 28, 1997 (the "Initial
Declaration"), and (ii) the filing of a certificate of trust with the Delaware
Secretary of State on January 28, 1997. The Trust's business and affairs are
conducted by its trustees: initially, The Chase Manhattan Bank, as
Institutional Trustee (as defined herein) and Chase Manhattan Bank Delaware, as
Delaware Trustee (as defined herein). The Trust exists for the exclusive
purposes of (i) issuing the Trust Securities, (ii) investing the gross proceeds
from the sale of the Common Securities and the Capital Securities to acquire
the Subordinated Debt Securities, and (iii) engaging in only those other
activities necessary or incidental thereto, which may include engaging in the
Exchange Offer. Accordingly, the Subordinated Debt Securities will be the sole
assets of the Trust, and payments under the Subordinated Debt Securities will
be the sole revenues of the Trust. All of the Common Securities are owned by
the Company. The principal place of business of the Trust is c/o Mercantile
Bancorporation Inc., One Mercantile Center, P.O. Box 524, St. Louis, MO 63166-
0524 (telephone number (314) 425-2525).
 
                               THE EXCHANGE OFFER
 
The Exchange Offer....  Up to $150,000,000 aggregate liquidation amount of New
                        Capital Securities are being offered in exchange for a
                        like aggregate liquidation amount of Old Capital Secu-
                        rities. Old Capital Securities may be tendered for ex-
                        change in whole or in part in a liquidation amount of
                        $100,000 (100 Capital Securities) or any integral mul-
                        tiple of $1,000 in excess thereof. MBI and the Trust
                        are making the Exchange Offer in order to satisfy their
                        obligations under the Registration Rights Agreement re-
                        lating to the Old Capital Securities. For a description
                        of the procedures for tendering Old Capital Securities,
                        see "The Exchange Offer--Procedures for Tendering Old
                        Capital Securities."
 
Expiration Date.......     
                        5:00 p.m., New York City time, on June 27, 1997 (such
                        time on such date being hereinafter called the "Expira-
                        tion Date"); unless the Exchange Offer is extended by
                        MBI and the Trust (in which case the term "Expiration
                        Date" shall mean the latest date and time to which the
                        Exchange Offer is extended). See "The Exchange Offer--
                        Expiration Date, Extensions, Amendments."     
 
Conditions to the       The Exchange Offer is subject to certain conditions,
 Exchange.............  which may be waived by MBI and the Trust in their sole
                        discretion. The Exchange Offer is not conditioned upon
                        any minimum liquidation amount of Old Capital Securi-
                        ties being tendered. See "The Exchange Offer--Condi-
                        tions to the Exchange Offer."
 
                        MBI and the Trust reserve the right in their sole and
                        absolute discretion, subject to applicable law, at any
                        time and from time to time, (i) to delay the acceptance
                        of the Old Capital Securities, (ii) to terminate the
                        Exchange Offer if certain specified conditions have not
                        been satisfied, (iii) to extend the Expiration Date of
                        the Exchange Offer and retain all Old Capital Securi-
                        ties tendered pursuant to the Exchange Offer, subject,
                        however, to the right of holders of Old Capital Securi-
                        ties to withdraw their tendered Old Capital Securities,
                        or (iv) to waive any condition or otherwise amend the
                        terms of the Exchange Offer in any respect. See "The
                        Exchange Offer--Expiration Date, Extensions, Amend-
                        ments."
 
                                       9
<PAGE>
 
 
Listing...............  Neither the Capital Securities nor the Subordinated
                        Debt Securities will be listed on a national securities
                        exchange or quoted on an inter-dealer quotation service
                        after the Exchange Offer.
 
Withdrawal Rights.....  Tenders of Old Capital Securities may be withdrawn at
                        any time on or prior to the Expiration Date by deliver-
                        ing a written notice of such withdrawal to the Exchange
                        Agent (as defined herein) in conformity with certain
                        procedures as set forth below under "The Exchange Of-
                        fer--Withdrawal Rights."
 
Procedures for
 Tendering Old
 Capital Securities...
                        Tendering holders of Old Capital Securities must com-
                        plete and sign a Letter of Transmittal in accordance
                        with the instructions contained therein and forward the
                        same by mail, facsimile transmission or hand delivery,
                        together with any other required documents, to the Ex-
                        change Agent, either with the Old Capital Securities to
                        be tendered or in compliance with the specified proce-
                        dures for guaranteed delivery of Old Capital Securi-
                        ties. Certain brokers, dealers, commercial banks, trust
                        companies and other nominees may also effect tenders by
                        book-entry transfer. Holders of Old Capital Securities
                        registered in the name of a broker, dealer, commercial
                        bank, trust company or other nominee are urged to con-
                        tact such person promptly if they wish to tender Old
                        Capital Securities pursuant to the Exchange Offer. See
                        "The Exchange Offer--Procedures for Tendering Old Capi-
                        tal Securities."
 
                        Letters of Transmittal and certificates representing
                        Old Capital Securities should not be sent to MBI or the
                        Trust. Such documents should only be sent to the Ex-
                        change Agent. Questions regarding how to tender and re-
                        quests for information should be directed to the Ex-
                        change Agent. See "The Exchange Offer--Exchange Agent."
 
Resales of New
 Capital Securities...
                        Based on interpretations by the staff of the Commis-
                        sion, as set forth in no-action letters issued to third
                        parties, the Company and the Trust believe that holders
                        of Old Capital Securities (other than any holder that
                        is an "affiliate" of the Company or the Trust as de-
                        fined under Rule 405 of the Securities Act) who ex-
                        change their Old Capital Securities for New Capital Se-
                        curities pursuant to the Exchange Offer may offer such
                        New Capital Securities for resale, resell such New Cap-
                        ital Securities and otherwise transfer such New Capital
                        Securities without compliance with the registration and
                        prospectus delivery provisions of the Securities Act,
                        provided that such New Capital Securities are acquired
                        in the ordinary course of such holders' business and
                        such holders are not engaged in, and do not intend to
                        engage in, a distribution of such New Capital Securi-
                        ties and have no arrangement or understanding with any
                        person to participate in the distribution of such New
                        Capital Securities. However, the staff of the Commis-
                        sion has not considered the Exchange Offer in the con-
                        text of a no-action letter, and there can be no assur-
                        ance that the staff of the Commission would make a sim-
                        ilar determination with respect to the Exchange Offer.
                        Each broker-dealer that receives New Capital Securities
                        for its own account in exchange for Old Capital Securi-
                        ties, where such Old Capital Securities were acquired
                        by such broker-dealer as a result of market-making ac-
                        tivities or other trading activities, must acknowledge
                        that it will deliver a prospectus in connection with
                        any resale of such New Capital Securities. See "Plan of
                        Distribution."
 
                                       10
<PAGE>
 
 
Exchange Agent........  The exchange agent with respect to the Exchange Offer
                        is The Chase Manhattan Bank (the "Exchange Agent"). The
                        address, and telephone and facsimile numbers of the Ex-
                        change Agent are set forth in "The Exchange Offer--Ex-
                        change Agent" and in the Letter of Transmittal.
 
Use of Proceeds.......  Neither MBI nor the Trust will receive any cash pro-
                        ceeds from the issuance of the New Capital Securities
                        offered hereby. See "Use of Proceeds."
 
Certain United States
 Federal Income Tax
 Considerations;
 ERISA Consideration..
                        Holders of Old Capital Securities should review the in-
                        formation set forth under "United States Federal Income
                        Taxation" and "ERISA Considerations" prior to tendering
                        Old Capital Securities in the Exchange Offer.
 
                             THE CAPITAL SECURITIES
 
Securities Offered....  $150,000,000 aggregate liquidation amount of New Capi-
                        tal Securities (liquidation amount $1,000 per Capital
                        Security). The terms of the New Capital Securities are
                        identical in all material respects to the terms of the
                        Old Capital Securities, except that the New Capital Se-
                        curities have been registered under the Securities Act
                        and therefor are not subject to certain restrictions on
                        transfer applicable to the Old Capital Securities and
                        will not provide for an increase in the Distribution
                        rate thereon.
 
General...............  The Capital Securities represent undivided beneficial
                        interests in the Trust's assets, which consist solely
                        of the Subordinated Debt Securities. The Subordinated
                        Debt Securities, in which the proceeds of the Trust Se-
                        curities are invested, mature on February 1, 2027, un-
                        less the Subordinated Debt Securities are redeemed by
                        the Company prior to such maturity as described under
                        "Description of the Capital Securities--Redemption."
 
Distributions.........  Holders of the Capital Securities will be entitled to
                        receive cumulative cash Distributions at a variable an-
                        nual rate equal to LIBOR plus 0.85% on the stated liq-
                        uidation amount of $1,000 per Capital Security, accru-
                        ing from the original date of issuance of the Old Capi-
                        tal Securities, and (subject to the extension of dis-
                        tribution payment periods described below) will be pay-
                        able quarterly, in arrears, on the first day of Febru-
                        ary, May, August and November of each year, commencing
                        May 1, 1997. See "Description of the Capital Securi-
                        ties--Distributions."
 
Option to Extend
 Interest Payment
 Period...............
                        The Company has the right, at any time, subject to cer-
                        tain conditions, to defer payments of interest on the
                        Subordinated Debt Securities for Extension Periods,
                        each not exceeding 20 consecutive quarterly periods;
                        provided that no Extension Period may extend beyond the
                        maturity date of the Subordinated Debt Securities. As a
                        consequence of the Company's extension of the interest
                        payment period on the Subordinated Debt Securities,
                        distributions on the Capital Securities would be de-
                        ferred but interest would continue to accrue during any
                        such Extension Period to the extent permitted by law.
                        In the event the Company exercises its right to extend
                        an interest payment period, then
 
                                       11
<PAGE>
 
                        during any Extension Period, subject to certain excep-
                        tions, (i) the Company shall not declare or pay any
                        dividend on, make any distributions with respect to, or
                        redeem, purchase, acquire or make a liquidation payment
                        with respect to, any of its capital stock or rights to
                        acquire such capital stock or make any guarantee pay-
                        ments (other than payments on the Guarantee and the
                        Common Securities Guarantee (as defined herein)) with
                        respect to the foregoing and (ii) the Company shall not
                        make any payment of interest on or principal of (or
                        premium, if any, on), or repay, repurchase or redeem,
                        any debt securities issued by the Company which rank
                        pari passu with or junior to the Subordinated Debt Se-
                        curities. Upon the termination of any Extension Period
                        and the payment of all amounts then due, the Company
                        may commence a new Extension Period, subject to certain
                        requirements. See "Description of the Subordinated Debt
                        Securities--Option to Extend Interest Payment Period."
                        Should an Extension Period occur with respect to the
                        Capital Securities, holders of the Capital Securities
                        will continue to recognize interest income at a vari-
                        able annual rate equal to LIBOR plus 0.85%, compounded
                        quarterly for United States federal income tax purposes
                        notwithstanding the deferred receipt of payments which
                        accrue during the Extension Period. As a result, such
                        holders will be required to include such amounts in
                        gross income for United States federal income tax pur-
                        poses in advance of the receipt of cash, and such hold-
                        ers will not receive the cash from the Trust related to
                        such income if such holders dispose of the Capital Se-
                        curities prior to the record date for payment of dis-
                        tributions. See "United States Federal Income Taxa-
                        tion--US Holders--Original Issue Discount."
 
Liquidation...........  The Company, as the holder of all of the Common Securi-
                        ties, has the right at any time to dissolve the Trust
                        (including, without limitation, upon the occurrence of
                        a Tax Event or a Capital Treatment Event), subject to
                        certain conditions (including the receipt of prior ap-
                        proval by the Federal Reserve if then required under
                        applicable capital guidelines or policies of the Fed-
                        eral Reserve), with the result that, after satisfaction
                        of liabilities to creditors of the Trust (to the extent
                        not satisfied by the Company), the Subordinated Debt
                        Securities would be distributed to the holders of the
                        Trust Securities on a pro rata basis in accordance with
                        the respective stated liquidation amounts thereof, in
                        liquidation of the Trust. In addition, the Trust will
                        be dissolved and liquidated under certain other circum-
                        stances. See "Description of the Capital Securities--
                        Liquidation Distribution Upon Dissolution."
 
Liquidation Amount....  In the event of the voluntary or involuntary dissolu-
                        tion of the Trust, after satisfaction of liabilities to
                        creditors of the Trust (to the extent not satisfied by
                        the Company) holders of the Capital Securities will be
                        entitled to receive $1,000 per Capital Security plus an
                        amount equal to accrued and unpaid distributions
                        thereon to the date of payment, unless the Subordinated
                        Debt Securities are distributed to holders of the Trust
                        Securities in exchange therefor. If such liquidation
                        distribution can be paid only in part because the Trust
                        has insufficient assets available to pay in full the
                        aggregate liquidation distribution, then the amounts
                        payable directly by the Trust on the Capital Securities
                        shall be paid on a pro rata basis. The holders of the
                        Common Securities will be entitled to receive distribu-
                        tions upon any such liquidation pro rata with the hold-
                        ers of the Capital Securities, except that if a Decla-
                        ration Event
 
                                       12
<PAGE>
 
                        of Default (as defined herein) has occurred and is con-
                        tinuing, the Capital Securities shall have a priority
                        over the Common Securities. See "Description of the
                        Capital Securities--Liquidation Distribution Upon Dis-
                        solution."
 
Maturity..............  Upon the repayment of the Subordinated Debt Securities
                        at maturity, the proceeds from such repayment will be
                        applied by the Institutional Trustee to redeem a like
                        amount of the Trust Securities, upon the terms and con-
                        ditions described herein. See "Description of the Capi-
                        tal Securities--Redemption."
 
Optional Redemption...  The Company has the right to redeem the Subordinated
                        Debt Securities, in whole or in part, at any time or
                        from time to time on or after February 1, 2007, at par,
                        together with accrued and unpaid interest to the date
                        of redemption, subject to the Company having received
                        prior approval from the Federal Reserve if then re-
                        quired under applicable capital guidelines or policies
                        of the Federal Reserve. See "Description of the Subor-
                        dinated Debt Securities--Redemption." Upon the redemp-
                        tion of the Subordinated Debt Securities, the proceeds
                        of such redemption will be applied by the Institutional
                        Trustee to redeem a like amount of the Trust Securities
                        pro rata at the applicable Redemption Price, upon the
                        terms and conditions described herein. See "Description
                        of the Capital Securities--Redemption."
 
Tax Event or Capital
 Treatment Event
 Redemption...........
                        If at any time a Tax Event or a Capital Treatment Event
                        should occur and be continuing, the Company may, within
                        90 days of the occurrence of such Tax Event or Capital
                        Treatment Event, redeem the Subordinated Debt Securi-
                        ties in whole or in part in certain circumstances de-
                        scribed herein at a redemption price equal to par plus
                        accrued and unpaid interest to the redemption date,
                        subject to the Company having received prior approval
                        from the Federal Reserve if then required under appli-
                        cable capital guidelines or policies of the Federal Re-
                        serve. Upon the redemption of the Subordinated Debt Se-
                        curities, the proceeds of such redemption will be ap-
                        plied by the Institutional Trustee to redeem a like
                        amount of the Trust Securities on a pro rata basis,
                        upon the terms and conditions described herein. See
                        "Description of the Capital Securities--Redemption."
 
The Guarantee.........  The payment of Distributions out of moneys held by the
                        Trust, payments on liquidation of the Trust and payment
                        upon the redemption of the Capital Securities are guar-
                        anteed by the Company as described herein under "De-
                        scription of the Guarantee." The Guarantee covers pay-
                        ments of Distributions and other payments on the Capi-
                        tal Securities only if and to the extent that the Trust
                        has funds available therefor, which funds will not be
                        available except to the extent the Company has made
                        payments of interest or principal or other payments on
                        the Subordinated Debt Securities. The Guarantee, when
                        taken together with the Company's obligations under the
                        Subordinated Debt Securities, the Declaration and the
                        Indenture (including its obligations to pay costs, ex-
                        penses, debts and other liabilities of the Trust (other
                        than with respect to the Trust Securities)), provides a
                        full and unconditional guarantee on a subordinated ba-
                        sis by the Company of amounts due on the Capital Secu-
                        rities. The Company has also agreed separately to guar-
                        antee the obligations of the Trust with respect to the
                        Common Securities as described herein under "Descrip-
                        tion of the Guarantee--General."
 
                                       13
<PAGE>
 
 
Ranking...............  The Common Securities will rank pari passu with, and
                        payments thereon will be made pro rata with, the Capi-
                        tal Securities, except that upon the occurrence and
                        during the continuance of a Declaration Event of De-
                        fault, the rights of the holders of the Common Securi-
                        ties to receive payment of Distributions and payments
                        upon liquidation, redemption or otherwise will be sub-
                        ordinated to the rights of the holders of the Capital
                        Securities. See "Description of the Capital Securi-
                        ties--General." The Subordinated Debt Securities will
                        be unsecured and subordinate and junior in right of
                        payment to the extent and in the manner set forth in
                        the Indenture to all Senior Indebtedness of the Compa-
                        ny. See "Description of the Subordinated Debt Securi-
                        ties." The Guarantee will constitute an unsecured obli-
                        gation of the Company and will rank subordinate and ju-
                        nior in right of payment to the extent and in the man-
                        ner set forth in the Guarantee to all Senior Indebted-
                        ness of the Company. The Company's obligations under
                        the Guarantee and the Subordinated Debt Securities are
                        also effectively subordinate to claims of creditors of
                        the Company's subsidiaries. See "Description of the
                        Guarantee."
 
Voting Rights.........  Holders of the Capital Securities will have limited
                        voting rights relating generally to the modification of
                        the Capital Securities and the Guarantee and the exer-
                        cise of the Trust's rights as the holder of the Subor-
                        dinated Debt Securities. Holders of the Capital Securi-
                        ties will not be entitled to appoint, remove or replace
                        the Institutional Trustee or the Delaware Trustee ex-
                        cept upon the occurrence of an Indenture Event of De-
                        fault (as defined herein) described herein. See "De-
                        scription of the Capital Securities--Voting Rights" and
                        "Removal of Issuer Trustees; Appointment of Succes-
                        sors."
 
Rating................  The Capital Securities are expected to be rated "BBB-"
                        by Standard & Poor's Ratings Services ("S&P") and "a3"
                        by Moody's Investors Service, Inc. ("Moody's"). A secu-
                        rity rating is not a recommendation to buy, sell or
                        hold securities and may be subject to revision or with-
                        drawal at any time by the assigning rating organiza-
                        tion.
 
Use of Proceeds.......  Neither MBI nor the Trust will receive any cash pro-
                        ceeds from the issuance of the New Capital Securities
                        offered hereby. MBI's proceeds from the sale of the
                        Subordinated Debt Securities were added to the general
                        funds of MBI and may be used to fund the proposed re-
                        purchases of the shares of the Company's common stock
                        (which are expected to be reissued by the Company in
                        connection with the proposed consummation of the acqui-
                        sition of Roosevelt) and the balance, if any, for gen-
                        eral corporate purposes, including, without limitation,
                        the reduction of indebtedness, investments in and ad-
                        vances to subsidiaries and possible future acquisitions
                        of bank and non-bank entities. Although the Company
                        from time to time evaluates potential acquisitions, it
                        currently has no understandings, commitments or agree-
                        ments with respect to any acquisitions, except with re-
                        spect to Mark Twain and Roosevelt. See "Recent Develop-
                        ments."
 
Transfer                The Capital Securities have been, and will be, issued
 Restrictions.........  and will be transferable only in blocks having an ag-
                        gregate liquidation amount of not less than $100,000
                        (100 Capital Securities) and any integral multiple of
                        $1,000 liquidation amount (1 Capital Security) in ex-
                        cess thereof See "Description of the Capital Securi-
                        ties--Restrictions on Transfer."
 
                                       14
<PAGE>
 
 
Absence of Market for
 the Capital
 Securities...........
                        The New Capital Securities will be a new issue of secu-
                        rities for which there is currently no market. There
                        can be no assurance as to the development or liquidity
                        of any market for the Capital Securities.
 
  For additional information with respect to the Capital Securities, see
"Description of the Capital Securities," "Description of the Subordinated Debt
Securities," "Description of the Guarantee" and "United States Federal Income
Taxation."
 
                                  RISK FACTORS
 
  Prospective investors should carefully consider the matters set forth under
"Risk Factors."
 
                         MERCANTILE BANCORPORATION INC.
                      SELECTED CONSOLIDATED FINANCIAL DATA
 
  The following table sets forth for the years indicated certain summary
historical consolidated financial information for MBI. The balance sheet data
and income statement data included in the summary financial data as of and for
the five years ended December 31, 1996 are taken from the supplemental audited
consolidated financial statements of MBI as of the end of and for each such
year. The balance sheet data and income statement data included in the summary
financial data as of and for the three months ended March 31, 1997 and 1996 are
taken from the supplemental unaudited consolidated financial statements as of
the end of and for such periods. The data for each of the above periods include
all adjustments which are, in the opinion of the management of MBI, necessary
to present a fair statement of these periods and are of a normal recurring
nature. Results for the three months ended March 31, 1997 are not necessarily
indicative of results for the entire year. The table also sets forth pro forma
combined consolidated financial information as of and for the three months
ended March 31, 1997, reflecting such financial information as if the
acquisitions of Roosevelt and Regional Bancshares, Inc. ("Regional"), an
Illinois corporation and bank holding company that was acquired by MBI on March
5, 1997, had occurred as of January 1, 1996. The following information should
be read in conjunction with the supplemental consolidated financial statements
of MBI, and the related notes thereto, and the unaudited pro forma combined
consolidated financial information, including the notes thereto, included in
documents incorporated herein by reference. See "Incorporation of Certain
Information by Reference."
 
                                       15
<PAGE>
 
 
<TABLE>   
<CAPTION>
                           ALL ENTITIES
                             PRO FORMA
                              COMBINED    AS OF OR FOR THE
                          CONSOLIDATED AS   THREE MONTHS
                           OF OR FOR THE        ENDED                            AS OF OR FOR THE
                           THREE MONTHS       MARCH 31                        YEAR ENDED DECEMBER 31
                               ENDED      ------------------  ----------------------------------------------------------
                          MARCH  31, 1997   1997      1996       1996        1995        1994        1993        1992
                          --------------- --------  --------  ----------  ----------  ----------  ----------  ----------
<S>                       <C>             <C>       <C>       <C>         <C>         <C>         <C>         <C>
PER COMMON SHARE DATA
Net income(1)...........     $   0.95     $   0.98  $   0.21  $     3.17  $     3.62  $     3.10  $     2.71  $     2.33
Dividends declared......         0.43         0.43      0.41        1.64        1.32        1.12        0.99        0.93
Book value at period
 end....................        26.26        24.76     23.98       25.11       24.44       21.71       20.12       18.16
Average shares
 outstanding
 (thousands)............       82,575       76,575    78,484      77,292      77,170      74,882      73,445      68,997
EARNINGS (THOUSANDS)
Interest income.........     $534,406     $398,462  $381,923  $1,552,863  $1,516,156  $1,311,928  $1,269,680  $1,316,560
Interest expense........      286,342      186,501   181,385     724,910     715,466     521,542     508,469     628,837
                             --------     --------  --------  ----------  ----------  ----------  ----------  ----------
Net interest income.....      248,064      211,961   200,538     827,953     800,690     790,386     761,211     687,723
Provision for possible
 loan losses............       19,083       18,443    34,149      73,015      41,533      48,791      70,384      88,238
Other income............      100,452       88,100    69,795     337,480     311,649     272,368     290,380     264,534
Other expense...........      201,074      165,595   203,696     718,668     640,519     645,011     666,067     616,159
Income taxes............       49,838       41,028    15,403     128,535     149,898     135,896     114,768      83,773
                             --------     --------  --------  ----------  ----------  ----------  ----------  ----------
Net income before
 extraordinary items....     $ 78,521     $ 74,995  $ 17,085  $  245,215  $  280,389  $  233,056  $  200,172  $  164,087
                             ========     ========  ========  ==========  ==========  ==========  ==========  ==========
ENDING BALANCE SHEET
 (MILLIONS)
Total assets............     $ 29,831     $ 22,078  $ 20,933  $   22,030  $   20,883  $   19,397  $   18,878  $   18,398
Earning assets..........       27,592       20,373    19,284      20,061      18,997      17,904      17,390      16,846
Investment securities...        7,755        4,847     5,103       4,746       4,964       4,895       5,234       5,148
Loans and leases, net of
 unearned income........       19,523       15,213    13,861      14,953      13,703      12,764      11,637      11,183
Deposits................       22,661       17,354    16,423      17,336      16,172      15,137      15,435      15,295
Long-term debt..........        1,326          452       328         305         344         351         340         365
Shareholders' equity....        2,128        1,882     1,883       1,946       1,915       1,643       1,510       1,322
Reserve for possible
 loan losses............          256          231       243         230         232         245         233         224
SELECTED RATIOS
Return on average
 assets.................         1.05%        1.38%     0.33%       1.16%       1.39%       1.22%       1.08%       0.93%
Return on average
 equity.................        14.45        15.63      3.50       12.95       15.64       14.66       14.06       13.32
Net interest rate
 margin(2)..............         3.64         4.36      4.27        4.34        4.38        4.61        4.58        4.36
Equity to assets........         7.13         8.52      8.99        8.83        9.17        8.47        8.00        7.19
Reserve for possible
 loan losses to:
 Outstanding loans......         1.31         1.52      1.75        1.54        1.69        1.92        2.00        2.00
 Non-performing loans...       271.59       273.18    271.46      318.99      241.79      552.34      289.13      155.54
Dividend payout ratio...        45.26        43.88       --        51.74       36.46       36.13       36.53       39.91
</TABLE>    
- -------
   
(1) Based on weighted average common shares outstanding.     
   
(2) Taxable-equivalent basis. Includes tax-equivalent adjustment of $3,855,000,
    $4,179,000, $16,353,000, $17,758,000, $17,962,000, $18,598,000 and
    $17,891,000 for March 31, 1997 and 1996, and December 31, 1996, 1995, 1994,
    1993 and 1992, respectively. These adjustments are based upon a federal tax
    rate of 35% for all periods except 1992, when a federal tax rate of 34% was
    used.     
       
                                       16
<PAGE>
 
                                 RISK FACTORS
 
  Prior to making an investment decision with respect to the New Capital
Securities or tendering the Old Capital Securities in the Exchange Offer,
prospective purchasers of the New Capital Securities and holders of the Old
Capital Securities should carefully review the information contained elsewhere
in this Prospectus and should particularly consider the following matters:
 
RANKING OF SUBORDINATE OBLIGATIONS UNDER THE GUARANTEE AND THE SUBORDINATED
DEBT SECURITIES
   
  The obligations of the Company under the Guarantee and the Subordinated Debt
Securities are subordinate and junior in right of payment to all present and
future Senior Indebtedness of the Company. No payment of principal (including
redemption payments, if any) or interest on the Subordinated Debt Securities
may be made if (i) any Senior Indebtedness of the Company is not paid when due
and any applicable grace period with respect to such default has ended with
such default not having been cured or waived or ceasing to exist or (ii) the
maturity of any Senior Indebtedness of the Company has been accelerated
because of a default. As of March 31, 1997, the Company had approximately
$227.0 million of Senior Indebtedness. There are no terms in the Capital
Securities, the Subordinated Debt Securities or the Guarantee that limit the
ability of the Company or its subsidiaries to incur additional indebtedness,
liabilities and obligations, including such indebtedness that ranks senior to
the Subordinated Debt Securities and the Guarantee. See "Description of the
Guarantee--Status of the Guarantee" and "Description of the Subordinated Debt
Securities."     
 
  Because the Company is a bank holding company, the Subordinated Debt
Securities and the Guarantee are effectively subordinated to all existing and
future liabilities, including trade payables, of the Company's subsidiaries,
except to the extent that the Company is a creditor of the subsidiaries
recognized as such. There are also various legal limitations on the extent to
which the Company's Banking Subsidiaries may extend credit, pay dividends or
otherwise supply funds to the Company or various of its affiliates.
 
GUARANTEE COVERS DISTRIBUTIONS AND OTHER PAYMENTS ONLY TO THE EXTENT THE TRUST
HAS AVAILABLE FUNDS; RELATED REMEDIES
 
  The terms of the New Guarantee will be those set forth in the Old Guarantee
and those made part of the Guarantee by the Trust Indenture Act of 1939, as
amended (the "Trust Indenture Act"), under which The Chase Manhattan Bank is
acting as trustee (the "Guarantee Trustee"). The Old Guarantee will be
qualified under the Trust Indenture Act upon the effectiveness of the Exchange
Offer Registration Statement with respect to the Guarantee. The Guarantee
Trustee will hold the Guarantee for the benefit of the holders of the Capital
Securities.
 
  The Guarantee guarantees to the holders of the Capital Securities the
following payments, to the extent not paid by the Trust: (i) any accrued and
unpaid Distributions required to be paid on the Capital Securities, to the
extent the Trust has funds available therefor; (ii) the Redemption Price,
including all accrued and unpaid Distributions to the date of redemption, with
respect to the Capital Securities called for redemption by the Trust, to the
extent the Trust has funds available therefor; and (iii) upon a voluntary or
involuntary dissolution, winding-up or termination of the Trust (other than in
connection with the Distribution of the Subordinated Debt Securities to the
holders of the Capital Securities in exchange therefor), the lesser of (a) the
aggregate of the liquidation amount and all accrued and unpaid Distributions
on the Capital Securities to the date of the payment, to the extent the Trust
has funds available therefor and (b) the amount of assets of the Trust
remaining available for distribution to holders of the Capital Securities in
liquidation of the Trust. The Guarantee is subordinated as described under "--
Ranking of Subordinate Obligations Under the Guarantee and the Subordinated
Debt Securities." The holders of a majority in liquidation amount of the
Capital Securities have the right to direct the time, method and place of
conducting any proceeding for any remedy available to the Guarantee Trustee or
to direct the exercise of any trust or power conferred upon the Guarantee
Trustee under the Guarantee. A holder of record of the Capital Securities may
institute a legal proceeding directly against the Company to enforce the
Guarantee Trustee's rights without first instituting any legal proceeding
against the Trust, the Guarantee Trustee
 
                                      17
<PAGE>
 
or any other person or entity. If the Company were to default on its
obligation to pay amounts payable on the Subordinated Debt Securities, the
Trust would lack available funds for the payment of Distributions or amounts
payable on redemption of the Capital Securities or otherwise, and, in such
event, holders of the Capital Securities would not be able to rely upon the
Guarantee for payment of such amounts. Instead, each holder of the Capital
Securities would rely on the enforcement (i) by the Institutional Trustee of
its rights as registered holder of the Subordinated Debt Securities against
the Company pursuant to the terms of the Subordinated Debt Securities or (ii)
by such holder of the Capital Securities of its right against the Company to
enforce payments of principal and interest on the Subordinated Debt Securities
having an aggregate principal amount equal to the aggregate liquidation amount
of Capital Securities of such holder. See "Description of the Capital
Securities," "Description of the Guarantee" and "Description of the
Subordinated Debt Securities." The Declaration provides that each holder of
the Capital Securities, by acceptance thereof, agrees to the provisions of the
Guarantee, including the subordination provisions thereof, and the Indenture.
 
ENFORCEMENT OF CERTAIN RIGHTS BY HOLDERS OF CAPITAL SECURITIES
 
  If a Declaration Event of Default with respect to the Trust occurs and is
continuing, then the holders of the Capital Securities would, except as
provided below, rely on the enforcement by the Institutional Trustee of its
rights as holder of the Subordinated Debt Securities against the Company. The
holders of a majority in liquidation amount of the Capital Securities will
have the right to direct the time, method and place of conducting any
proceeding for any remedy available to the Institutional Trustee with respect
to the Capital Securities or to direct the exercise of any trust or power
conferred upon the Institutional Trustee under the Declaration, including the
right to direct the Institutional Trustee to exercise the remedies available
to it as holder of the Subordinated Debt Securities. If the Institutional
Trustee fails to enforce its rights under the Subordinated Debt Securities
after the holders of a majority in liquidation amount of the Capital
Securities have so directed the Institutional Trustee, a holder of record of
the Capital Securities may, to the fullest extent permitted by law, institute
a legal proceeding directly against the Company to enforce the rights of the
Institutional Trustee under the Subordinated Debt Securities, without first
instituting any legal proceeding against such Institutional Trustee or any
other person.
 
  Notwithstanding the foregoing, if a Declaration Event of Default has
occurred and is continuing and such event is attributable to the failure of
the Company to pay interest or principal on the Subordinated Debt Securities
on the respective dates such interest or principal is payable, after giving
effect to any Extension Period (or in the case of redemption, on the
redemption date), then a holder of record of the Capital Securities may
institute directly against the Company a proceeding for enforcement of
payment, on or after the respective due dates specified in the Subordinated
Debt Securities, to such holder directly of the principal of or interest on
the Subordinated Debt Securities having an aggregate principal amount equal to
the aggregate liquidation amount of the Capital Securities of such holder (a
"Direct Action"). In connection with such Direct Action, the Company will be
subrogated to the rights of such holder of the Capital Securities under the
Declaration to the extent of any payment made by the Company to such holder of
the Capital Securities in such Direct Action; provided, however, that no such
subrogation right may be exercised so long as a Declaration Event of Default
has occurred and is continuing. The holders of the Capital Securities will not
be able to exercise directly any other remedy available to the holders of the
Subordinated Debt Securities. See "Description of the Capital Securities--
Declaration Events of Default."
 
OPTION TO EXTEND INTEREST PAYMENT PERIOD FOR UP TO FIVE YEARS AND CONSEQUENT
DEFERRAL OF DISTRIBUTIONS ON CAPITAL SECURITIES
 
  The Company has the right under the Indenture to defer payments of interest
on the Subordinated Debt Securities by extending the interest payment period,
at any time and from time to time, subject to certain conditions, for
Extension Periods, each not exceeding 20 consecutive quarterly periods,
provided that no Extension Period may extend beyond the stated maturity of the
Subordinated Debt Securities. During each such Extension Period, quarterly
Distributions on the Capital Securities would also be deferred (but would
continue to accrue at a variable annual rate equal to LIBOR plus 0.85%,
despite such deferral, with interest thereon
 
                                      18
<PAGE>
 
compounded quarterly to the fullest extent permitted by law) by the Trust. In
the event that the Company exercises this right to defer interest payments on
the Subordinated Debt Securities, and such deferral is continuing, or if there
shall have occurred and be continuing any Indenture Event of Default or if the
Company shall be in default with respect to the payment of its obligations
under the Guarantee, (a) the Company shall not declare or pay dividends on, or
make a distribution with respect to, or redeem, purchase or acquire, or make a
liquidation payment with respect to, any of the Company's capital stock (other
than (i) purchases or acquisitions of shares of any such capital stock or
rights to acquire such capital stock in connection with the satisfaction by
the Company of its obligations under any employee benefit plans, (ii) as a
result of a reclassification of the Company's capital stock or rights to
acquire such capital stock or the exchange or conversion of one class or
series of capital stock of the Company or rights to acquire such capital stock
for another class or series of the Company's capital stock or rights to
acquire such capital stock, (iii) the purchase of fractional interests in
shares of the Company's capital stock pursuant to the conversion or exchange
provisions of such capital stock or the security being converted or exchanged,
(iv) dividends and distributions made on the Company's capital stock or rights
to acquire such capital stock with the Company's capital stock or rights to
acquire such capital stock, or (v) any declaration of a dividend in connection
with the implementation of a shareholder rights plan, or the issuance of stock
under any such plan in the future, or the redemption or repurchase of any such
rights pursuant thereto), or make guarantee payments (other than payments
under the Guarantee and the Common Securities Guarantee) in respect of the
foregoing and (b) the Company shall not make any payment of interest,
principal or premium, if any, on or repay, repurchase or redeem any debt
securities issued by the Company that rank pari passu with or junior to the
Subordinated Debt Securities. Prior to the termination of any such Extension
Period, the Company may further extend the interest payment period, provided
that each such Extension Period, together with all such previous and further
extensions thereof, may not exceed 20 consecutive quarterly periods or extend
beyond the maturity of the Subordinated Debt Securities. Upon the termination
of any Extension Period and the payment of all amounts then due, the Company
may commence a new Extension Period, subject to the terms set forth herein.
See "Description of the Capital Securities" and "Description of the
Subordinated Debt Securities."
 
  During each Extension Period, if any, each holder of the Capital Securities
will continue to accrue income (as original issue discount ("OID")) in respect
of the deferred interest allocable to its Capital Securities for United States
federal income tax purposes, which will be allocated but not distributed. In
such event, each holder of the Capital Securities will recognize income for
United States federal income tax purposes in advance of the receipt of cash,
and will not receive cash related to such income from the Trust if such holder
disposes of its Capital Securities prior to the record date for payment of
such deferred interest. See "United States Federal Income Taxation--US
Holders--Original Issue Discount."
 
  The Company has no current intention of exercising its right to defer
payments of interest on the Subordinated Debt Securities. However, should the
Company determine to exercise such right in the future, the market price of
the Capital Securities is likely to be affected. A holder that disposes of its
Capital Securities during an Extension Period, therefore, might not receive
the same return on its investment as a holder that continues to hold its
Capital Securities. In addition, as a result of the existence of the Company's
right to defer interest payments, the market price, if any, of the Capital
Securities (which represent undivided beneficial interests in the Subordinated
Debt Securities) may be more volatile than the market price of other similar
securities where the issuer does not have such right to defer interest
payments.
 
PROPOSED TAX LEGISLATION
 
  On February 6, 1997, President Clinton proposed certain tax law changes that
would, among other things, generally deny corporate issuers a deduction for
interest in respect of certain debt obligations (the "Proposed Legislation")
if such debt obligations have a maximum term in excess of 15 years and are not
shown as indebtedness on the issuer's applicable consolidated balance sheet.
As currently proposed, the Proposed Legislation would be effective generally
for instruments issued on or after the date of first Congressional committee
action. Under current law, the Company will be able to deduct interest on the
Subordinated Debt Securities and, based upon the effective date of the
Proposed Legislation as it is currently proposed, it is expected
 
                                      19
<PAGE>
 
that if the Proposed Legislation were enacted, such legislation would not
apply retroactively to the Subordinated Debt Securities. However, if the
Proposed Legislation is enacted with retroactive effect with respect to the
Subordinated Debt Securities, the Company would not be entitled to an interest
deduction with respect to the Subordinated Debt Securities. There can be no
assurance that the Proposed Legislation, if enacted, will not apply
retroactively to the Subordinated Debt Securities or that other legislation
enacted after the date hereof will not otherwise adversely affect the ability
of the Company to deduct the interest payable on the Subordinated Debt
Securities. Accordingly, there can be no assurance that a Tax Event will not
occur. See "Description of the Capital Securities--Redemption" and
"Description of the Subordinated Debt Securities--Proposed Tax Legislation."
 
REDEMPTION; DISTRIBUTION
 
  The Company, as the holder of all of the outstanding Common Securities, has
the right at any time (including, without limitation, upon the occurrence of a
Tax Event or a Capital Treatment Event) to dissolve the Trust, and, after
satisfaction of liabilities to creditors of the Trust (to the extent not paid
by the Company), cause the Subordinated Debt Securities to be distributed to
the holders of the Trust Securities on a pro rata basis in accordance with the
respective liquidation amounts thereof, in liquidation of the Trust. See
"Description of the Capital Securities--Liquidation Distribution Upon
Dissolution." In certain circumstances described herein, the Company will have
the right to redeem the Subordinated Debt Securities, in whole or in part, in
which event the Trust will redeem the Trust Securities having an aggregate
liquidation amount equal to the aggregate principal amount of the Subordinated
Debt Securities redeemed by the Company on a pro rata basis. The exercise of
such rights is subject to the Company having received prior approval from the
Federal Reserve, if then required under applicable capital guidelines or
policies of the Federal Reserve. See "Description of the Capital Securities--
Redemption;" and "--Liquidation Distribution Upon Dissolution."
 
  Under current United States federal income tax law, a distribution of the
Subordinated Debt Securities upon the dissolution of the Trust generally would
not be a taxable event to holders of the Capital Securities. However, a
dissolution of the Trust in which holders of the Capital Securities receive
cash would be a taxable event to such holders. See "United States Federal
Income Taxation--US Holders--Receipt of Subordinated Debt Securities or Cash
Upon Liquidation of the Trust."
 
  There can be no assurance as to the market prices for the Capital Securities
or the Subordinated Debt Securities that may be distributed in exchange for
the Capital Securities if a dissolution and liquidation of the Trust were to
occur. Accordingly, the Capital Securities that an investor may purchase,
whether in this Exchange Offer or in the secondary market, or the Subordinated
Debt Securities that a holder of the Capital Securities may receive on
dissolution and liquidation of the Trust, may trade at a discount to the price
paid to purchase the Capital Securities offered hereby. Because the ability of
the Trust to pay amounts due on the Capital Securities is wholly dependent
upon the Company's making payments on the Subordinated Debt Securities as and
when required, and because holders of the Capital Securities may receive the
Subordinated Debt Securities upon dissolution and liquidation of the Trust,
prospective purchasers of the New Capital Securities and holders of the Old
Capital Securities are also making an investment decision with regard to the
Subordinated Debt Securities and should carefully review all the information
regarding the Subordinated Debt Securities contained herein and evaluate the
credit risk of the Company. See "Description of the Capital Securities" and
"Description of the Subordinated Debt Securities."
 
CONSEQUENCES OF HIGHLY LEVERAGED TRANSACTION
 
  The Indenture does not contain any provisions that afford holders of the
Subordinated Debt Securities protection in the event of a highly leveraged
transaction, including a change of control, or other similar transactions
involving the Company that may adversely affect such holders. See "Description
of the Subordinated Debt Securities."
 
                                      20
<PAGE>
 
LIMITED VOTING RIGHTS
 
  Holders of the Capital Securities have limited voting rights relating
generally to the modification of the Capital Securities and the Guarantee and
the exercise of the Trust's rights as the holder of the Subordinated Debt
Securities. Holders of the Capital Securities are not entitled to appoint,
remove or replace the Institutional Trustee or the Delaware Trustee except
upon the occurrence of an Indenture Event of Default described herein. The
Institutional Trustee and the holders of a majority of the Common Securities
may amend the Declaration without the consent of the holders of the Capital
Securities to ensure that the Trust will be classified for United States
federal income tax purposes as a grantor trust and will not be required to be
registered as an investment company under the 1940 Act (as defined herein),
even if such action adversely affects the interests of such holders. See
"Description of the Capital Securities--Voting Rights" and "--Removal of
Issuer Trustees; Appointment of Successors."
 
CONSEQUENCES OF A FAILURE TO EXCHANGE OLD CAPITAL SECURITIES
 
  The Old Capital Securities have not been registered under the Securities Act
or any state securities laws and therefore may not be offered, sold or
otherwise transferred except in compliance with the registration requirements
of the Securities Act and any other applicable securities laws, or pursuant to
an exemption therefrom or in a transaction not subject thereto, and in each
case in compliance with certain other conditions and restrictions. Old Capital
Securities which remain outstanding after consummation of the Exchange Offer
will continue to bear a legend reflecting such restrictions on transfer. In
addition, upon consummation of the Exchange Offer, holders of Old Capital
Securities which remain outstanding will not be entitled to any rights to have
such Old Capital Securities registered under the Securities Act or to any
similar rights under the Registration Rights Agreement. MBI and the Trust do
not intend to register under the Securities Act any Old Capital Securities
which remain outstanding after consummation of the Exchange Offer.
 
  To the extent that Old Capital Securities are tendered and accepted in the
Exchange Offer, any trading market for Old Capital Securities which remain
outstanding after the Exchange Offer could be adversely affected.
 
  The New Capital Securities and any Old Capital Securities which remain
outstanding after consummation of the Exchange Offer will constitute a single
series of Capital Securities under the Declaration and, accordingly, will vote
together as a single class for purposes of determining whether holders of the
requisite percentage in outstanding liquidation amount thereof have taken
certain actions or exercised certain rights under the Declaration.
 
  The Old Capital Securities provide that, if the Exchange Offer is not
consummated within 150 days of the original issues of the Old Capital
Securities, the Distribution rate borne by the Old Capital Securities will
increase by 0.25% per annum (to a maximum increase of 0.75%) commencing on the
151st day after the original issuance of the Old Capital Securities, until the
Exchange Offer is consummated. Following consummation of the Exchange Offer,
the Old Capital Securities will not be entitled to any increase in the
Distribution rate thereon. The New Capital Securities will not be entitled to
any such increase in the interest rate thereon.
 
ABSENCE OF PUBLIC MARKET
 
  The Old Capital Securities were issued to, and the Company believes are
currently owned by, a relatively small number of beneficial owners. The Old
Capital Securities have not been registered under the Securities Act and will
continue to be subject to restrictions on transferability to the extent that
they are not exchanged for the New Capital Securities. Although the New
Capital Securities will generally be permitted to be resold or otherwise
transferred by the holders (who are not affiliates of MBI or the Trust)
without compliance with the registration requirements under the Securities
Act, they will constitute a new issue of securities with no established
trading market. Capital Securities may be transferred by the holders thereof
only in blocks having a liquidation amount of not less than $100,000 (100
Capital Securities). Accordingly, no assurance can be given that an active
public or other market will develop for the New Capital Securities or the Old
Capital Securities. If
 
                                      21
<PAGE>
 
an active public market does not develop, the market price and liquidity of
the New Capital Securities may be adversely affected.
 
  If a public trading market develops for the New Capital Securities, future
trading prices of such securities will depend on many factors, including,
among other things, prevailing interest rates, results of operations and the
market for similar securities. Depending on prevailing interest rates, the
market for similar securities and other factors, including the financial
condition of MBI, the New Capital Securities may trade at a discount. Neither
the New Capital Securities nor the New Subordinated Debt Securities will be
listed on a national securities exchange or quoted on an inter-dealer
quotation service after the Exchange Offer.
 
  Notwithstanding the registration of the New Capital Securities in the
Exchange Offer, holders who are "affiliates" (as defined under Rule 405 of the
Securities Act) of MBI or the Trust may publicly offer for sale or resell the
New Capital Securities only in compliance with the provisions of Rule 144
under the Securities Act or any other available exemptions under the
Securities Act.
 
  Each broker-dealer that receives New Capital Securities for its own account
in exchange for Old Capital Securities, where such Old Capital Securities were
acquired by such broker-dealer as a result of market-making activities or
other trading activities, must acknowledge that it will deliver a prospectus
in connection with any resale of such New Capital Securities. See "Plan of
Distribution."
 
EXCHANGE OFFER PROCEDURES
 
  Issuance of the New Capital Securities in exchange for Old Capital
Securities pursuant to the Exchange Offer will be made only after a timely
receipt by the Exchange Agent of such Old Capital Securities, a properly
completed and duly executed Letter of Transmittal and all other required
documents. Therefore, holders of the Old Capital Securities desiring to tender
such Old Capital Securities in exchange for New Capital Securities should
allow sufficient time to ensure timely delivery. The Company, the Trust, the
Institutional Trustee, the Indenture Trustee and the Exchange Agent are under
no duty to give notification of defects or irregularities with respect to the
tenders of Old Capital Securities for exchange.
 
                                      22
<PAGE>
 
                        MERCANTILE BANCORPORATION INC.
 
  The Company is a registered bank holding company headquartered in St. Louis,
Missouri and incorporated under the laws of the State of Missouri in 1970. At
March 31, 1997, the Company, directly or through its subsidiaries, owned all
of the capital stock of Mercantile Bank National Association, based in St.
Louis, Missouri and 27 other commercial banks and one federally chartered
thrift, all of which operate from 467 banking offices and 427 Fingertip
Banking automated teller machines located throughout Missouri, Illinois, Iowa,
Arkansas and eastern Kansas.
 
  The Company's services concentrate in three major lines of business--
consumer, corporate and trust and investment advisory services. The Company
also operates non-banking subsidiaries that provide related financial
services, including investment management, brokerage services and asset-based
lending.
 
  The Company has one acquisition transaction currently pending; the proposed
acquisition of Roosevelt, which is headquartered in St. Louis, Missouri. For
further information regarding the pending acquisitions of Roosevelt, see
"Recent Developments."
 
  The Company is a legal entity separate and distinct from Mercantile Bank
National Association and the Company's other Banking Subsidiaries and
affiliates. Because the Company is a holding company, its rights and the
rights of its creditors and shareholders, including the holders of its
Subordinated Debt Securities and the Guarantee, to participate in the assets
of any subsidiary upon its liquidation or recapitalization will be subject to
the prior claims of such subsidiary's creditors except to the extent that the
Company may itself be a creditor having recognized claims against such
subsidiary, in which case it will share in such subsidiary's assets along with
other creditors.
 
  There are various legal and regulatory limitations on the extent to which
the Company's Banking Subsidiaries may extend credit, pay dividends or
otherwise supply funds to the Company. The approval of the OCC is required if
total dividends declared by a national bank in any calendar year should exceed
net profits for that year combined with its retained net profits for the
preceding two years. Moreover, banks may not pay dividends in excess of their
undivided profits. In determining whether and to what extent to pay dividends,
each Banking Subsidiary must also consider the effect of dividend payments on
applicable risk-based capital and leverage requirements as well as policy
statements of the federal regulatory agencies to the effect that, generally,
banking organizations should pay dividends out of current operating earnings.
The Company's state-chartered Banking Subsidiaries are subject to similar
restrictions under their respective state laws. While the specific standards
vary from state to state, the Company's Banking Subsidiaries are generally
permitted to pay dividends only from net profits, and then, only after first
deducting losses and credit write-offs. All of the applicable state statutes
prohibit the payment of dividends if such a payment would impair capital. In
addition there are numerous governmental requirements and regulations that
affect the activities of the Company and its bank and non-bank subsidiaries.
See the discussion in Part 1, Item 1 of the Company's Form 10-K for the year
ended December 31, 1996 under the caption "Supervision and Regulation."
 
                                      23
<PAGE>
 
                              RECENT DEVELOPMENTS
   
  As of March 31, 1997, the Company reported, on a restated consolidated
basis, total assets of $22.1 billion, total deposits of $17.4 billion and
shareholders' equity of $1.9 billion, compared with total assets of $20.9
billion, total deposits of $16.4 billion and shareholders' equity of $1.9
billion, as of March 31, 1996. The Company reported, on a restated
consolidated basis, net income of $0.98 per share for the three months ended
March 31, 1997, compared with $0.21 per share (which includes one-time
acquisition charges) for the comparable period of 1996.     
   
  During the fourth quarter of 1996, the Company announced the execution of a
definitive agreement to acquire Roosevelt, a Delaware corporation and a
savings and loan holding company. The definitive agreement is dated December
23, 1996 and the transaction is expected to close during the third quarter of
1997. Such transaction is subject to prior approval of the stockholders of
Roosevelt and appropriate regulatory approvals.     
   
  Roosevelt, with its executive offices in St. Louis, Missouri, owns Roosevelt
Bank which operates from 81 locations in Missouri, Kansas and Illinois. As of
March 31, 1997, Roosevelt reported, on a consolidated basis, total assets of
$7.5 billion, total deposits of $5.3 billion and total stockholders' equity of
$469.6 million. Upon consummation of the transaction, the Company will issue
up to 13 million shares (net of up to 7 million reissued treasury shares) of
its common stock at an exchange ratio of .4211 for each share of Roosevelt
common stock, or $22.00 per share in cash, as consideration in the
acquisition. The Roosevelt transaction will be accounted for as a purchase.
       
  On April 25, 1997, Mercantile completed the acquisition of Mark Twain
Bancshares, Inc. ("Mark Twain"), a Missouri corporation and bank holding
company. This acquisition was accounted for under the pooling-of-interests
method of accounting. As of March 31, 1997, Mark Twain reported, on a
consolidated basis, total assets of $3.2 billion, total deposits of $2.5
billion and shareholders' equity of $320.4 million.     
   
  In connection with the acquisition of Mark Twain, Mercantile restated its
consolidated financial statements as of and for the years ended December 31,
1996, 1995 and 1994 and as of and for the three months ended March 31, 1997
and 1996. MBI filed supplemental financial statements as of and for the years
ended December 31, 1996, 1995 and 1994 and as of and for the three months
ended March 31, 1997 and 1996 in a Current Report on Form 8-K dated May 13,
1997, which has been incorporated by reference into this Prospectus.     
 
                                      24
<PAGE>
 
                                 CAPITALIZATION
   
  The following table sets forth the unaudited consolidated capitalization of
the Company and its subsidiaries as of March 31, 1997, and "as adjusted" to
reflect, on a pro forma basis as of such date, the application of the net
proceeds from the sale of the Old Capital Securities and the consummation of
the acquisitions of Roosevelt and Regional.     
 
<TABLE>   
<CAPTION>
                                                         MARCH 31, 1997
                                                 ---------------------------
                                                             AS ADJUSTED AND
                                                   ACTUAL     ACQUISITIONS
                                                 ----------  ---------------
                                                     (DOLLARS IN THOUSANDS)
<S>                                              <C>         <C>             <C>
Long-Term Debt.................................. $  451,982    $1,325,982
                                                 ----------    ----------
Shareholders' Equity:
  Common Stock..................................    396,963       426,963
  Capital Surplus...............................    233,384       507,884
  Retained Earnings.............................  1,432,824     1,374,648
  Treasury Stock, at Cost.......................   (181,251)     (181,251)
                                                 ----------    ----------
    Total Shareholders' Equity..................  1,881,920     2,128,244
                                                 ----------    ----------
    Total Capitalization........................ $2,333,902    $3,454,226
                                                 ==========    ==========
</TABLE>    
 
                                       25
<PAGE>
 
                             ACCOUNTING TREATMENT
 
  For financial reporting purposes, the Trust will be treated as a subsidiary
of the Company and, accordingly, the accounts of the Trust will be included in
the consolidated financial statements of the Company. The Capital Securities
will be presented in the consolidated balance sheet of the Company as a
component of long-term debt. The Company will record Distributions payable on
the Capital Securities as interest expense in its consolidated statement of
income.
                       
                    RATIO OF EARNINGS TO FIXED CHARGES     
 
<TABLE>   
<CAPTION>
                                   THREE MONTHS     YEAR ENDED DECEMBER 31,
                                      ENDED      -----------------------------
                                  MARCH 31, 1997 1996  1995  1994  1993  1992
                                  -------------- ----- ----- ----- ----- -----
<S>                               <C>            <C>   <C>   <C>   <C>   <C>
Ratio of Earnings to Fixed
 Charges(1)
  Excluding Interest on Deposits.     4.00x      3.75x 3.88x 4.70x 5.40x 4.27x
  Including Interest on Deposits.     1.62x      1.51x 1.59x 1.69x 1.60x 1.39x
</TABLE>    
- --------
   
(1) For purposes of calculating the ratio of earnings to fixed charges,
    earnings consist of earnings before income taxes plus interest and one-
    third of rental expense. Fixed charges, excluding interest on deposits,
    consists of interest on indebtedness and one-third of rental expense
    (which is deemed representative of the interest factor). Fixed charges,
    including interest on deposits, consists of the foregoing items plus
    interest on deposits.     
 
                                USE OF PROCEEDS
   
  Neither MBI nor the Trust will receive any cash proceeds from the issuance
of the New Capital Securities offered hereby. In consideration for issuing the
New Capital Securities in exchange for the Old Capital Securities as described
in this Prospectus, the Trust will receive Old Capital Securities in like
liquidation amount. The Old Capital Securities surrendered in exchange for the
New Capital Securities will be retired and cancelled. The net proceeds to the
Trust from the offering of the Old Capital Securities was approximately $147.0
million (after payment of the expenses of the offering and the Initial
Purchasers' compensation). All of the net proceeds from the sale of the
Capital Securities were invested by the Trust in the Old Subordinated Debt
Securities. The Company intends to use the net proceeds from the sale of the
Old Subordinated Debt Securities to fund the proposed repurchases of the
shares of the Company's common stock (which are expected to be reissued by the
Company in connection with the proposed consummation of the acquisition of
Roosevelt) and the balance, if any, for general corporate purposes, including,
without limitation, the reduction of indebtedness, investments in and advances
to subsidiaries and possible future acquisitions of bank and non-bank
subsidiaries. Although the Company from time to time evaluates potential
acquisitions, it currently has no understandings, commitments or agreements
with respect to any acquisitions, except with respect to Roosevelt. See
"Recent Developments." Pending such application, the net proceeds were
invested in short-term investment grade obligations.     
 
                                      26
<PAGE>
 
                          MERCANTILE CAPITAL TRUST I
 
  The Trust is a statutory business trust created under Delaware law pursuant
to (i) the Initial Declaration (as such Initial Declaration was amended and
restated, the "Declaration") and (ii) the filing of a certificate of trust for
the Trust with the Delaware Secretary of State on January 28, 1997. The
Trust's business and affairs are conducted by its trustees. Pursuant to the
Declaration, at least one trustee of the Trust is required to be an entity
that maintains its principal place of business in the State of Delaware (the
"Delaware Trustee") and at least one trustee is required to be a financial
institution that is unaffiliated with the Company and is eligible and acts as
property trustee and as indenture trustee pursuant to the terms set forth
therein (the "Institutional Trustee" and together with the Delaware Trustee,
the "Issuer Trustees"). The Chase Manhattan Bank is initially serving as
Institutional Trustee and Chase Manhattan Bank Delaware is initially serving
as Delaware Trustee. In addition, three individuals who are employees or
officers of or affiliated with the holder of the majority of the Common
Securities, are acting as administrators with respect to the Trust (the
"Administrators"). The Administrators were selected by the holders of a
majority of the Common Securities. See "Description of the Capital
Securities--Miscellaneous." The Trust exists for the exclusive purposes of (i)
issuing the Trust Securities representing undivided beneficial interests in
the assets of the Trust, (ii) investing the gross proceeds of such Trust
Securities in the Subordinated Debt Securities and (iii) engaging in only
those other activities necessary or incidental thereto, which may include
engaging in the Exchange Offer. All of the Common Securities of the Trust are
and will continue to be directly or indirectly owned by the Company. The
Common Securities of the Trust rank pari passu, and payments will be made
thereon pro rata, with the Capital Securities of the Trust except that upon
the occurrence and continuation of a Declaration Event of Default, the rights
of the holders of the Common Securities to payment from the Trust in respect
of distributions and payments upon liquidation, redemption and otherwise will
be subordinated to the rights of the holders of the Capital Securities. The
Trust has a term of approximately 55 years, but may earlier dissolve as
provided in the Declaration. The Company, as the holder of all of the
outstanding Common Securities, has the right at any time to dissolve the Trust
(including, without limitation, upon the occurrence of a Tax Event) and, after
satisfaction of liabilities to creditors of the Trust, cause the Subordinated
Debt Securities to be distributed to the holders of the Trust Securities on a
pro rata basis in accordance with the respective liquidation amounts thereof,
in liquidation of the Trust.
 
  The Institutional Trustee holds title to the Subordinated Debt Securities
for the benefit of the holders of the Trust Securities and has the power to
exercise all rights, powers and privileges under the Indenture as the holder
of the Subordinated Debt Securities. In addition, the Institutional Trustee
maintains exclusive control of a separate, segregated, non-interest bearing
trust account (the "Property Account") to hold all payments made in respect of
the Subordinated Debt Securities for the benefit of the holders of the Trust
Securities issued by the Trust. The Institutional Trustee will make payments
of distributions and payments on liquidation, redemption and otherwise to the
holders of record of the Trust Securities out of funds from the Property
Account. Holders of the Capital Securities are not entitled to appoint, remove
or replace the Institutional Trustee or the Delaware Trustee except upon the
occurrence of an Indenture Event of Default. See "Description of the Capital
Securities--Voting Rights" and "Removal of Trustees; Appointment of
Successors." The Company, as borrower under the Indenture, has covenanted to
pay all costs, expenses, debts and other obligations related to the Trust
(other than in respect of the Trust Securities). See "Description of the
Subordinated Debt Securities--Miscellaneous." The rights of the holders of the
Capital Securities of the Trust, including economic rights, rights to
information and voting rights, are set forth in the Declaration, the Delaware
Business Trust Act, as amended (the "Trust Act"), and the Trust Indenture Act.
See "Description of the Capital Securities."
 
                                      27
<PAGE>
 
                              THE EXCHANGE OFFER
 
PURPOSE AND EFFECT OF THE EXCHANGE OFFER
 
  In connection with the sale of the Old Capital Securities, MBI and the Trust
entered into the Registration Rights Agreement with the Initial Purchasers,
pursuant to which MBI and the Trust agreed to file and to use their best
efforts to cause to become effective with the Commission a registration
statement with respect to the exchange of the Old Capital Securities for
capital securities with terms identical in all material respects to the terms
of the Old Capital Securities. A copy of the Registration Rights Agreement has
been filed as an exhibit to the Registration Statement of which this
Prospectus is a part.
 
  The Exchange Offer is being made to satisfy the contractual obligations of
MBI and the Trust under the Registration Rights Agreement. The form and terms
of the New Capital Securities are the same as the form and terms of the Old
Capital Securities except that the New Capital Securities have been registered
under the Securities Act and therefore will not be subject to certain
restrictions on transfer applicable to the Old Capital Securities and will not
provide, under certain circumstances, for any increase in the Distribution
rate thereon. In that regard, the Old Capital Securities provide, among other
things, that, if the Exchange Offer is not consummated by July 4, 1997, the
Distribution rate borne by the Old Capital Securities commencing on July 5,
1997, will increase by 0.25% per annum (to a maximum increase of 0.75%) until
the Exchange Offer is consummated. Upon consummation of the Exchange Offer,
holders of Old Capital Securities will not be entitled to any increase in the
Distribution rate thereon or any further registration rights under the
Registration Rights Agreement, except under limited circumstances. See "Risk
Factors--Consequences of a Failure to Exchange Old Capital Securities."
 
  The Exchange Offer is not being made to, nor will the Company accept tenders
for exchange from, holders of Old Capital Securities in any jurisdiction in
which the Exchange Offer or the acceptance thereof would not be in compliance
with the securities or blue sky laws of such jurisdiction.
 
  Unless the context requires otherwise, the term "holder" with respect to the
Exchange Offer means any person in whose name the Old Capital Securities are
registered on the books of the Company or any other person who has obtained a
properly completed bond power from the registered holder, or any participant
in The Depository Trust Company ("DTC") whose name appears on a security
position listing as a holder of Old Capital Securities (which, for purposes of
the Exchange Offer, include beneficial interests in the Old Capital
Securities, held by direct or indirect participants in The Depository Trust
Company and Old Capital Securities held in definitive form).
 
  Pursuant to the Exchange Offer, MBI will exchange as soon as practicable
after the date hereof the Old Guarantee for the New Guarantee and all of the
Old Subordinated Debt Securities, of which $154,640,000 aggregate principal
amount is outstanding, for a like aggregate principal amount of the New
Subordinated Debt Securities. The New Guarantee and New Subordinated Debt
Securities have been registered under the Securities Act.
 
TERMS OF THE EXCHANGE
 
  The Company hereby offers, upon the terms and subject to the conditions set
forth in this Prospectus and in the accompanying Letter of Transmittal, to
exchange up to $150,000,000 aggregate liquidation amount of New Capital
Securities for a like aggregate liquidation amount of Old Capital Securities
properly tendered on or prior to the Expiration Date and not properly
withdrawn in accordance with the procedures described below. The Company will
issue, promptly after the Expiration Date, an aggregate liquidation amount of
up to $150,000,000 of New Capital Securities in exchange for a like principal
amount of outstanding Old Capital Securities tendered and accepted in
connection with the Exchange Offer. Holders may tender their Old Capital
Securities in whole or in part in a liquidation amount of not less than
$100,000 or any integral multiple of $1,000 in excess thereof.
 
 
                                      28
<PAGE>
 
  The Exchange Offer is not conditioned upon any minimum liquidation amount of
Old Capital Securities being tendered. As of the date of this Prospectus,
$150,000,000 aggregate liquidation amount of the Old Capital Securities is
outstanding.
 
  Holders of Old Capital Securities do not have any appraisal or dissenters'
rights in connection with the Exchange Offer. Old Capital Securities which are
not tendered for or are tendered but not accepted in connection with the
Exchange Offer will remain outstanding and will not be entitled to any further
registration rights under the Registration Rights Agreement, except under
limited circumstances. See "Risk Factors--Consequences of a Failure to
Exchange Old Capital Securities."
 
  If any tendered Old Capital Securities are not accepted for exchange because
of an invalid tender, the occurrence of certain other events set forth herein
or otherwise, certificates for any such unaccepted Old Capital Securities will
be returned, without expense, to the tendering holder thereof promptly after
the Expiration Date.
 
  Holders who tender Old Capital Securities in connection with the Exchange
Offer will not be required to pay brokerage commissions or fees or, subject to
the instructions in the Letter of Transmittal, transfer taxes with respect to
the exchange of Old Capital Securities in connection with the Exchange Offer.
MBI will pay all charges and expenses, other than certain applicable taxes
described below, in connection with the Exchange Offer. See "--Fees and
Expenses."
 
  NEITHER THE BOARD OF DIRECTORS OF MBI NOR ANY OF THE TRUSTEES OF THE TRUST
MAKES ANY RECOMMENDATION TO HOLDERS OF OLD CAPITAL SECURITIES AS TO WHETHER TO
TENDER OR REFRAIN FROM TENDERING ALL OR ANY PORTION OF THEIR OLD CAPITAL
SECURITIES PURSUANT TO THE EXCHANGE OFFER. IN ADDITION, NO ONE HAS BEEN
AUTHORIZED TO MAKE ANY SUCH RECOMMENDATION. HOLDERS OF OLD CAPITAL SECURITIES
MUST MAKE THEIR OWN DECISION WHETHER TO TENDER PURSUANT TO THE EXCHANGE OFFER
AND, IF SO, THE AGGREGATE AMOUNT OF OLD CAPITAL SECURITIES TO TENDER AFTER
READING THIS PROSPECTUS AND THE LETTER OF TRANSMITTAL AND CONSULTING WITH
THEIR ADVISERS, IF ANY, BASED ON THEIR FINANCIAL POSITION AND REQUIREMENTS.
 
EXPIRATION DATE, EXTENSIONS, AMENDMENTS
   
  The term "Expiration Date" means 5:00 p.m., New York City time, on June 27,
1997 unless the Exchange Offer is extended by MBI and the Trust (in which case
the term "Expiration Date" shall mean the latest date and time to which the
Exchange Offer is extended).     
 
  MBI and the Trust expressly reserve the right in their sole and absolute
discretion, subject to applicable law, at any time and from time to time, (i)
to delay the acceptance of the Old Capital Securities for exchange, (ii) to
terminate the Exchange Offer (whether or not any Old Capital Securities have
theretofore been accepted for exchange) if MBI and the Trust determine, in
their sole and absolute discretion, that any of the events or conditions
referred to under "--Conditions to the Exchange Offer" has occurred or exists
or has not been satisfied, (iii) to extend the Expiration Date of the Exchange
Offer and retain all Old Capital Securities tendered pursuant to the Exchange
Offer, subject, however, to the right of holders of Old Capital Securities to
withdraw their tendered Old Capital Securities as described under "--
Withdrawal Rights", and (iv) to waive any condition or otherwise amend the
terms of the Exchange Offer in any respect. If the Exchange Offer is amended
in a manner determined by MBI and the Trust to constitute a material change,
or if MBI and the Trust waive a material condition of the Exchange Offer, MBI
and the Trust will promptly disclose such amendment by means of a prospectus
supplement that will be distributed to the registered holders of the Old
Capital Securities, and MBI and the Trust will extend the Exchange Offer to
the extent required by Rule 14e-1 under the Exchange Act.
 
  Any such delay in acceptance, extension, termination or amendment will be
followed promptly by oral or written notice thereof to the Exchange Agent (any
such oral notice to be promptly confirmed in writing) and by
 
                                      29
<PAGE>
 
making a public announcement thereof, and such announcement in the case of an
extension will be made no later than 9:00 a.m., New York City time, on the
next business day after the previously scheduled Expiration Date. Without
limiting the manner in which MBI and the Trust may choose to make any public
announcement and subject to applicable laws, MBI and the Trust shall have no
obligation to publish, advertise or otherwise communicate any such public
announcement other than by issuing a release to an appropriate news agency.
 
ACCEPTANCE FOR EXCHANGE AND ISSUANCE OF NEW CAPITAL SECURITIES
 
  Upon the terms and subject to the conditions of the Exchange Offer, the
Trust will exchange, and will issue to the Exchange Agent, New Capital
Securities for Old Capital Securities validly tendered and not withdrawn
(pursuant to the withdrawal rights described under "--Withdrawal Rights")
promptly after the Expiration Date.
 
  In all cases, delivery of New Capital Securities in exchange for Old Capital
Securities tendered and accepted for exchange pursuant to the Exchange Offer
will be made only after timely receipt by the Exchange Agent of (i) Old
Capital Securities or a book-entry confirmation of a book-entry transfer of
Old Capital Securities into the Exchange Agent's account at DTC, (ii) the
Letter of Transmittal (or facsimile thereof), properly completed and duly
executed, with any required signature guarantees, and (iii) any other
documents required by the Letter of Transmittal.
 
  The term "book-entry confirmation" means a timely confirmation of a book-
entry transfer of Old Capital Securities into the Exchange Agent's account at
DTC.
 
  Subject to the terms and conditions of the Exchange Offer, the Trust will be
deemed to have accepted for exchange, and thereby exchanged, Old Capital
Securities validly tendered and not withdrawn as, if and when the Trust gives
oral or written notice to the Exchange Agent (any such oral notice to be
promptly confirmed in writing) of the Trust's acceptance of such Old Capital
Securities for exchange pursuant to the Exchange Offer. The Exchange Agent
will act as agent for the Trust for the purpose of receiving tenders of Old
Capital Securities, Letters of Transmittal and related documents, and as agent
for tendering holders for the purpose of receiving Old Capital Securities,
Letters of Transmittal and related documents and transmitting New Capital
Securities to validly tendered holders. Such exchange will be made promptly
after the Expiration Date. If for any reason whatsoever, acceptance for
exchange or the exchange of any Old Capital Securities tendered pursuant to
the Exchange Offer is delayed (whether before or after the Trust's acceptance
for exchange of Old Capital Securities) or the Trust extends the Exchange
Offer or is unable to accept for exchange or exchange Old Capital Securities
tendered pursuant to the Exchange Offer, then, without prejudice to the
Trust's rights set forth herein, the Exchange Agent may, nevertheless, on
behalf of the Trust and subject to Rule 14e-1(c) under the Exchange Act,
retain tendered Old Capital Securities and such Old Capital Securities may not
be withdrawn except to the extent tendering holders are entitled to withdrawal
rights as described under "--Withdrawal Rights."
 
  Pursuant to the Letter of Transmittal, a holder of Old Capital Securities
will warrant and agree in the Letter of Transmittal that it has full power and
authority to tender, exchange, sell, assign and transfer Old Capital
Securities, that the Trust will acquire good, marketable and unencumbered
title to the tendered Old Capital Securities, free and clear of all liens,
restrictions, charges and encumbrances, and the Old Capital Securities
tendered for exchange are not subject to any adverse claims or proxies. The
holder also will warrant and agree that it will, upon request, execute and
deliver any additional documents deemed by the Trust or the Exchange Agent to
be necessary or desirable to complete the exchange, sale, assignment and
transfer of the Old Capital Securities tendered pursuant to the Exchange
Offer.
 
PROCEDURES FOR TENDERING OLD CAPITAL SECURITIES
 
  Valid Tender. Except as set forth below, in order for Old Capital Securities
to be validly tendered pursuant to the Exchange Offer, either (i) a properly
completed and duly executed Letter of Transmittal (or facsimile thereof), with
any required signature guarantees and any other required documents, must be
received by the Exchange Agent at the address set forth under "--Exchange
Agent," on or prior to the Expiration Date and (a)
 
                                      30
<PAGE>
 
tendered Old Capital Securities must be received by the Exchange Agent, or (b)
such Old Capital Securities must be tendered pursuant to the procedures for
book-entry transfer set forth below and a book-entry confirmation must be
received by the Exchange Agent, in each case on or prior to the Expiration
Date, or (ii) the guaranteed delivery procedures set forth below must be
complied with.
 
  If less than all of the Old Capital Securities are tendered, a tendering
holder should fill in the amount of Old Capital Securities being tendered in
the appropriate box on the Letter of Transmittal. The entire amount of Old
Capital Securities delivered to the Exchange Agent will be deemed to have been
tendered unless otherwise indicated.
 
  THE METHOD OF DELIVERY OF CERTIFICATES, THE LETTER OF TRANSMITTAL AND ALL
OTHER REQUIRED DOCUMENTS, IS AT THE OPTION AND SOLE RISK OF THE TENDERING
HOLDER, AND DELIVERY WILL BE DEEMED MADE ONLY WHEN ACTUALLY RECEIVED BY THE
EXCHANGE AGENT. IF DELIVERY IS BY MAIL, REGISTERED MAIL, RETURN RECEIPT
REQUESTED, PROPERLY INSURED, OR AN OVERNIGHT DELIVERY SERVICE IS RECOMMENDED.
IN ALL CASES, SUFFICIENT TIME SHOULD BE ALLOWED TO ENSURE TIMELY DELIVERY.
 
  Book-Entry Transfer. The Exchange Agent will establish an account with
respect to the Old Capital Securities at DTC for purposes of the Exchange
Offer within two business days after the date of this Prospectus. Any
financial institution that is a participant in DTC's book-entry transfer
facility system may make a book-entry delivery of the Old Capital Securities
by causing DTC to transfer such Old Capital Securities into the Exchange
Agent's account at DTC in accordance with DTC's procedures for transfers.
However, although delivery of Old Capital Securities may be effected through
book-entry transfer into the Exchange Agent's account at DTC, the Letter of
Transmittal (or facsimile thereof), properly completed and duly executed, with
any required signature guarantees and any other required documents, must in
any case be delivered to and received by the Exchange Agent at its address set
forth under "--Exchange Agent" on or prior to the Expiration Date, or the
guaranteed delivery procedure set forth below must be complied with.
 
DELIVERY OF DOCUMENTS TO DTC DOES NOT CONSTITUTE DELIVERY TO THE EXCHANGE
AGENT
 
  Signature Guarantees. Certificates for the Old Capital Securities need not
be endorsed and signature guarantees on the Letter of Transmittal are
unnecessary unless (a) a certificate for the Old Capital Securities is
registered in a name other than that of the person surrendering the
certificate or (b) such registered holder completes the box entitled "Special
Issuance Instructions" or "Special Delivery Instructions" in the Letter of
Transmittal. In the case of (a) or (b) above, such certificates for Old
Capital Securities must be duly endorsed or accompanied by a properly executed
bond power, with the endorsement or signature on the bond power and on the
Letter of Transmittal guaranteed by a firm or other entity identified in Rule
17Ad-15 under the Exchange Act as an "eligible guarantor institution,"
including (as such terms are defined therein): (i) a bank; (ii) a broker,
dealer, municipal securities broker or dealer or government securities broker
or dealer; (iii) a credit union; (iv) a national securities exchange,
registered securities association or clearing agency; or (v) a savings
association that is a participant in a Securities Transfer Association (an
"Eligible Institution"), unless surrendered on behalf of such Eligible
Institution. See Instruction 1 to the Letter of Transmittal.
 
  Guaranteed Delivery. If a holder desires to tender Old Capital Securities
pursuant to the Exchange Offer and the certificates for such Old Capital
Securities are not immediately available or time will not permit all required
documents to reach the Exchange Agent on or before the Expiration Date, or the
procedures for book-entry transfer cannot be completed on a timely basis, such
Old Capital Securities may nevertheless be tendered, provided that all of the
following guaranteed delivery procedures are complied with:
 
    (i) such tenders are made by or through an Eligible Institution;
 
                                      31
<PAGE>
 
    (ii) a properly completed and duly executed Notice of Guaranteed
  Delivery, substantially in the form accompanying the Letter of Transmittal,
  is received by the Exchange Agent, as provided below, on or prior to
  Expiration Date; and
 
    (iii) the certificates (or book-entry confirmation) representing all
  tendered Old Capital Securities, in proper form for transfer, together with
  a properly completed and duly executed Letter of Transmittal (or facsimile
  thereof), with any required signature guarantees and any other documents
  required by the Letter of Transmittal, are received by the Exchange Agent
  within three New York Stock Exchange trading days after the date of
  execution of such Notice of Guaranteed Delivery.
 
  The Notice of Guaranteed Delivery may be delivered by hand, or transmitted
by facsimile or mail to the Exchange Agent and must include a guarantee by an
Eligible Institution in the form set forth in such notice.
 
  Notwithstanding any other provision hereof, the delivery of New Capital
Securities in exchange for Old Capital Securities tendered and accepted for
exchange pursuant to the Exchange Offer will in all cases be made only after
timely receipt by the Exchange Agent of Old Capital Securities, or of a book-
entry confirmation with respect to such Old Capital Securities, and a properly
completed and duly executed Letter of Transmittal (or facsimile thereof),
together with any required signature guarantees and any other documents
required by the Letter of Transmittal. Accordingly, the delivery of New
Capital Securities might not be made to all tendering holders at the same
time, and will depend upon when Old Capital Securities, book-entry
confirmations with respect to Old Capital Securities and other required
documents are received by the Exchange Agent.
 
  The Trust's acceptance for exchange of Old Capital Securities tendered
pursuant to any of the procedures described above will constitute a binding
agreement between the tendering holder and the Trust upon the terms and
subject to the conditions of the Exchange Offer.
 
  Determination of Validity. All questions as to the form of documents,
validity, eligibility (including time of receipt) and acceptance for exchange
of any tendered Old Capital Securities will be determined by the Trust, in its
sole discretion, whose determination shall be final and binding on all
parties. The Trust reserves the absolute right, in its sole and absolute
discretion, to reject any and all tenders determined by it not to be in proper
form or the acceptance of which, or exchange for, may, in the view of counsel
to the Trust, be unlawful. The Trust also reserves the absolute right, subject
to applicable law, to waive any of the conditions of the Exchange Offer as set
forth under "--Conditions to the Exchange Offer" or any condition or
irregularity in any tender of Old Capital Securities of any particular holder
whether or not similar conditions or irregularities are waived in the case of
other holders.
 
  The Trust's interpretation of the terms and conditions of the Exchange Offer
(including the Letter of Transmittal and the instructions thereto) will be
final and binding. No tender of Old Capital Securities will be deemed to have
been validly made until all irregularities with respect to such tender have
been cured or waived. Neither the Trust, any affiliates or assigns of the
Trust, the Exchange Agent nor any other person shall be under any duty to give
any notification of any irregularities in tenders or incur any liability for
failure to give any such notification.
 
  If any Letter of Transmittal, endorsement, bond power, power of attorney or
any other document required by the Letter of Transmittal is signed by a
trustee, executor, administrator, guardian, attorney-in-fact, officer of a
corporation or other person acting in a fiduciary or representative capacity,
such person should so indicate when signing, and unless waived by the Trust,
evidence satisfactory to the Trust, in its sole discretion, of such person's
authority to so act must be submitted.
 
  A beneficial owner of Old Capital Securities that are held by or registered
in the name of a broker, dealer, commercial bank, trust company or other
nominee or custodian is urged to contact such entity promptly if such
beneficial holder wishes to participate in the Exchange Offer.
 
                                      32
<PAGE>
 
RESALES OF NEW CAPITAL SECURITIES
 
  Based on interpretations by the staff of the Commission, as set forth in no-
action letters issued to third parties, the Company and the Trust believe that
holders of Old Capital Securities (other than any holder that is an
"affiliate" of the Company or the Trust as defined under Rule 405 of the
Securities Act) who exchange their Old Capital Securities for New Capital
Securities pursuant to the Exchange Offer may offer such New Capital
Securities for resale, resell such New Capital Securities and otherwise
transfer such New Capital Securities without compliance with the registration
and prospectus delivery provisions of the Securities Act, provided that such
New Capital Securities are acquired in the ordinary course of such holders'
business and such holders are not engaged in, and do not intend to engage in,
a distribution of such New Capital Securities and have no arrangement or
understanding with any person to participate in the distribution of such New
Capital Securities. However, the staff of the Commission has not considered
the Exchange Offer in the context of a no-action letter, and there can be no
assurance that the staff of the Commission would make a similar determination
with respect to the Exchange Offer. Each broker-dealer that receives New
Capital Securities for its own account in exchange for Old Capital Securities,
where such Old Capital Securities were acquired by such broker-dealer as a
result of market-making activities or other trading activities, must
acknowledge that it will deliver a prospectus in connection with any resale of
such New Capital Securities. See "Plan of Distribution."
 
WITHDRAWAL RIGHTS
 
  Except as otherwise provided herein, tenders of Old Capital Securities may
be withdrawn at any time on or prior to the Expiration Date.
 
  In order for a withdrawal to be effective, a written, telegraphic or
facsimile transmission of such notice of withdrawal must be timely received by
the Exchange Agent at one of its addresses set forth under "Exchange Agent" on
or prior to the Expiration Date. Any such notice of withdrawal must specify
the name of the person who tendered the Old Capital Securities to be
withdrawn, the aggregate principal amount of Old Capital Securities to be
withdrawn, and (if certificates for such Old Capital Securities have been
tendered) the name of the registered holder of the Old Capital Securities as
set forth on the Old Capital Securities, if different from that of the person
who tendered such Old Capital Securities. If Old Capital Securities have been
delivered or otherwise identified to the Exchange Agent, then prior to the
physical release of such Old Capital Securities, the tendering holder must
submit the serial numbers shown on the particular Old Capital Securities to be
withdrawn and the signature on the notice of withdrawal must be guaranteed by
an Eligible Institution, except in the case of Old Capital Securities tendered
for the account of an Eligible Institution. If Old Capital Securities have
been tendered pursuant to the procedures for book-entry transfer set forth in
"Procedures for Tendering Old Capital Securities," the notice of withdrawal
must specify the name and number of the account at DTC to be credited with the
withdrawal of Old Capital Securities, in which case a notice of withdrawal
will be effective if delivered to the Exchange Agent by written, telegraphic
or facsimile transmission. Withdrawals of tenders of Old Capital Securities
may not be rescinded. Old Capital Securities properly withdrawn will not be
deemed validly tendered for purposes of the Exchange Offer, but may be
retendered at any subsequent time on or prior to the Expiration Date by
following any of the procedures described above under "Procedures for
Tendering Old Capital Securities."
 
  All questions as to the validity, form and eligibility (including time of
receipt) of such withdrawal notices will be determined by the Trust, in its
sole discretion, whose determination shall be final and binding on all
parties. Neither the Trust, any affiliates or assigns of the Trust, the
Exchange Agent or any other person shall be under any duty to give any
notification of any irregularities in any notice of withdrawal or incur any
liability for failure to give any such notification. Any Old Capital
Securities that have been tendered but which are withdrawn will be returned to
the holder thereof promptly after withdrawal.
 
DISTRIBUTIONS ON THE NEW CAPITAL SECURITIES
 
  Holders of Old Capital Securities whose Old Capital Securities are accepted
for exchange will not receive accumulated Distributions on such Old Capital
Securities for any period from and after the last Distribution Date with
respect to such Old Capital Securities prior to the original issue date of the
New Capital Securities or, if no
 
                                      33
<PAGE>
 
such Distributions have been made, will not receive any accumulated
Distributions on such Old Capital Securities, and will be deemed to have
waived the right to receive any Distributions on such Old Capital Securities
accumulated from and after such Distribution Date or, if no such Distributions
have been made, from and after February 4, 1997.
 
CONDITIONS TO THE EXCHANGE OFFER
 
  Notwithstanding any other provisions of the Exchange Offer, or any extension
of the Exchange Offer, MBI and the Trust will not be required to accept for
exchange, or to exchange, any Old Capital Securities for any New Capital
Securities, and, as described below, may terminate the Exchange Offer (whether
or not any Old Capital Securities have theretofore been accepted for exchange)
or may waive any conditions to or amend the Exchange Offer, if any of the
following conditions have occurred or exist or have not been satisfied:
 
    (a) there shall occur a change in the current interpretation by the staff
  of the Commission which permits the New Capital Securities issued pursuant
  to the Exchange Offer in exchange for Old Capital Securities to be offered
  for resale, resold and otherwise transferred by holders thereof (other than
  broker-dealers and any such holder which is an "affiliate" of MBI or the
  Trust within the meaning of Rule 405 under the Securities Act) without
  compliance with the registration and prospectus delivery provisions of the
  Securities Act provided that such New Capital Securities are acquired in
  the ordinary course of such holders' business and such holders have no
  arrangement or understanding with any person to participate in the
  distribution of such New Capital Securities;
 
    (b) any action or proceeding shall have been instituted or threatened in
  any court or by or before any governmental agency or body with respect to
  the Exchange Offer which, in MBI's and the Trust's judgment, would
  reasonably be expected to impair the ability of MBI and the Trust to
  proceed with the Exchange Offer;
 
    (c) any law, statute, rule or regulation shall have been adopted or
  enacted which, in MBI's and the Trust's judgment, would reasonably be
  expected to impair the ability of MBI and the Trust to proceed with the
  Exchange Offer;
 
    (d) a banking moratorium shall have been declared by United States
  federal or any state banking authorities which, in MBI's and the Trust's
  judgment, would reasonably be expected to impair the ability of MBI and the
  Trust to proceed with the Exchange Offer;
 
    (e) trading on the New York Stock Exchange or generally in the United
  States over-the-counter market shall have been suspended by Order of the
  Commission or any other governmental authority which, in MBI's and the
  Trust's judgment, would reasonably be expected to impair the ability of MBI
  and the Trust to proceed with the Exchange Offer;
 
    (f) a stop order shall have been issued by the Commission or any state
  securities authority suspending the effectiveness of the Registration
  Statement or proceedings shall have been initiated or, to the knowledge of
  MBI or the Trust, threatened for that purpose or that any governmental
  approval has not been obtained, which approval MBI and the Trust shall, in
  their sole discretion, deem necessary for the consummation of the Exchange
  Offer as contemplated hereby; or
 
    (g) any change, or any development involving a prospective change, in the
  business or financial affairs of MBI and the Trust or any of their
  subsidiaries have occurred which, in the sole judgment of MBI and the
  Trust, might materially impair the ability of MBI and the Trust to proceed
  with the Exchange Offer.
 
  If MBI and the Trust determine in their sole and absolute discretion that
any of the foregoing events or conditions has occurred or exist or has not
been satisfied, MBI and the Trust may, subject to applicable law, terminate
the Exchange Offer (whether or not any Old Capital Securities have theretofore
been accepted for exchange) or may waive any such condition or otherwise amend
the terms of the Exchange Offer in any respect. If such waiver or amendment
constitutes a material change to the Exchange Offer, MBI and the Trust will
promptly disclose such waiver by means of a prospectus supplement that will be
distributed to the registered holders of the Old Capital Securities, and MBI
and the Trust will extend the Exchange Offer to the extent required by Rule
14e-1 under the Exchange Act.
 
                                      34
<PAGE>
 
EXCHANGE AGENT
 
  The Chase Manhattan Bank has been appointed as Exchange Agent for the
Exchange Offer. Delivery of the Letters of Transmittal and any other required
documents, questions, requests for assistance and requests for additional
copies of this Prospectus or of the Letter of Transmittal should be directed
to the Exchange Agent as follows:
 
  The Chase Manhattan Bank
  Global Trust Services
  450 West 33rd Street, 15th Floor
  New York, New York 10001
  Attention: Ronald J. Halleran
 
  Telephone: (212) 946-3068
  Facsimile: (212) 946-8158
 
Delivery to other than the above address or facsimile numbers will not
constitute a valid delivery.
 
FEES AND EXPENSES
 
  MBI has agreed to pay the Exchange Agent reasonable and customary fees for
its services and will reimburse it for its reasonable out-of-pocket expenses
in connection therewith. MBI will also pay brokerage houses and other
custodians, nominees and fiduciaries the reasonable out-of-pocket expenses
incurred by them in forwarding copies of this Prospectus and related documents
to the beneficial owners of Old Capital Securities, and in handling or
tendering for their customers.
 
  Holders who tender their Old Capital Securities for exchange will not be
obligated to pay any transfer taxes in connection therewith. If, however, New
Capital Securities are to be delivered to, or are to be issued in the name of,
any person other than the registered holder of the Old Capital Securities
tendered, or if a transfer tax is imposed for any reason other than the
exchange of Old Capital Securities in connection with the Exchange Offer, then
the amount of any such transfer taxes (whether imposed on the registered
holder or any other persons) will be payable by the tendering holder. If
satisfactory evidence of payment of such taxes or exemption therefrom is not
submitted with the Letter of Transmittal, the amount of such transfer taxes
will be billed directly to such tendering holder.
 
  Neither MBI nor the Trust will make any payment to brokers, dealers or
others soliciting acceptances of the Exchange Offer.
 
                                      35
<PAGE>
 
                     DESCRIPTION OF THE CAPITAL SECURITIES
 
  The Old Capital Securities were issued and the New Capital Securities will
be issued pursuant to the terms of the Declaration. The Institutional Trustee,
The Chase Manhattan Bank, is trustee for the Capital Securities under the
Declaration. The terms of the Capital Securities include those stated in the
Declaration and those made part of the Declaration by the Trust Indenture Act
and the Trust Act. The following summary of the material terms and provisions
of the Capital Securities does not purport to be complete and is subject to,
and qualified in its entirety by reference to, the Declaration (a copy of
which may be obtained from the Company or the Trust), the Trust Act and the
Trust Indenture Act.
 
GENERAL
 
  The Declaration authorizes the Administrators to issue, on behalf of the
Trust, the Trust Securities, which represent undivided beneficial interests in
the assets of the Trust. All of the Common Securities are owned by the
Company. The Common Securities rank pari passu, and payments will be made
thereon on a pro rata basis, with the Capital Securities, except that upon the
occurrence and during the continuance of a Declaration Event of Default, the
rights of the holders of the Common Securities to receive payment of periodic
distributions and payments upon liquidation, redemption and otherwise will be
subordinated to the rights of the holders of the Capital Securities. The
Declaration does not permit the issuance by the Trust of any securities other
than the Trust Securities and the Exchange Securities or the incurrence of any
indebtedness by the Trust. Pursuant to the Declaration, the Institutional
Trustee holds legal title to the Subordinated Debt Securities purchased by the
Trust for the benefit of the holders of the Trust Securities. The payment of
Distributions out of money held by the Trust, and payments upon redemption of
the Capital Securities upon liquidation of the Trust, are guaranteed by the
Company as described under "Description of the Guarantee." The Guarantee is
held by The Chase Manhattan Bank, the Guarantee Trustee, for the benefit of
the holders of the Capital Securities. The Guarantee does not cover payment of
Distributions in respect of the Capital Securities to the extent the Trust
does not have available funds to pay Distributions. In such event, the remedy
of holders of the Capital Securities would be, through the vote of holders of
a majority in liquidation amount of the Capital Securities, to direct the
Institutional Trustee to enforce the Institutional Trustee's rights under the
Subordinated Debt Securities except in the circumstances in which a holder of
such Capital Securities may take Direct Action. See "--Voting Rights" and "--
Declaration Events of Default."
 
DISTRIBUTIONS
 
  Distributions on each Capital Security are payable in U.S. dollars at a
variable annual rate equal to LIBOR plus 0.85% (which is the same rate payable
on the Subordinated Debt Securities) on the stated liquidation amount of
$1,000 per Capital Security, compounded quarterly to the extent permitted by
law. The term "Distribution" as used herein includes cash distributions and
any such compounded distributions payable unless otherwise stated. The amount
of Distributions payable for any period will be computed on the basis of the
actual number of days elapsed in a year of twelve, 30-day months.
 
  Distributions on the Capital Securities are cumulative, accrue from the date
of original issuance of the Old Capital Securities, and are payable (subject
to extension of distribution payment periods as described herein) quarterly in
arrears on the first day of February, May, August and November of each year
(each, a "Distribution Payment Date"), commencing May 1, 1997, when, as and if
available for payment. Distributions will be made by the Institutional
Trustee, except as otherwise described below.
 
  The Company has the right under the Indenture to defer payments of interest
on the Subordinated Debt Securities by extending the interest payment period
at any time and from time to time, subject to the conditions described below,
although such interest will continue to accrue on the Subordinated Debt
Securities at a variable annual rate of LIBOR plus 0.85%, compounded quarterly
to the extent permitted by law during any Extension Period. If such right is
exercised, quarterly Distributions on the Capital Securities will also be
deferred (though such distributions will continue to accrue at the variable
annual rate equal to LIBOR plus 0.85%, compounded
 
                                      36
<PAGE>
 
quarterly to the extent permitted by law), during any Extension Period. Such
right to extend any interest payment period for the Subordinated Debt
Securities is limited to Extension Periods, each not exceeding 20 consecutive
quarterly periods, and no Extension Period may be initiated while accrued
interest from a prior, completed Extension Period is unpaid or while the
Company is in default on the payment of interest that has become due and
payable on the Subordinated Debt Securities, and no Extension Period may
extend beyond the maturity of the Subordinated Debt Securities. In the event
that the Company exercises this right, then during any Extension Period (a)
the Company shall not declare or pay dividends on, make a distribution with
respect to, or redeem, purchase or acquire, or make a liquidation payment with
respect to, any of its capital stock or rights to acquire such capital stock
(other than (i) purchases or acquisitions of shares of any such capital stock
or rights to acquire such capital stock in connection with the satisfaction by
the Company of its obligations under any employee benefit plans, (ii) as a
result of a reclassification of the Company's capital stock or rights to
acquire such capital stock or the exchange or conversion of one class or
series of the Company's capital stock or rights to acquire such capital stock
for another class or series of the Company's capital stock or rights to
acquire such capital stock, (iii) the purchase of fractional interests in
shares of the Company's capital stock pursuant to the conversion or exchange
provisions of such capital stock or the security being converted or exchanged,
(iv) dividends and distributions made on the Company's capital stock or rights
to acquire such capital stock with the Company's capital stock or rights to
acquire the capital stock or (v) any declaration of a dividend in connection
with the implementation of a shareholder rights plan, or the issuance of stock
under any such plan in the future, or the redemption or repurchase of any such
rights pursuant thereto), or make guarantee payments (other than payments
under the Guarantee and the Common Securities Guarantee) with respect to the
foregoing and (b) the Company shall not make any payment of interest,
principal or premium, if any, on or repay, repurchase or redeem any debt
securities issued by the Company that rank pari passu with or junior to the
Subordinated Debt Securities. Prior to the termination of any such Extension
Period in respect of the Subordinated Debt Securities, the Company may further
extend the interest payment period; provided that each such Extension Period
in respect of the Subordinated Debt Securities, together with all such
previous and further extensions thereof, may not exceed 20 consecutive
quarterly periods or extend beyond the maturity of the Subordinated Debt
Securities. Upon the termination of any Extension Period in respect of the
Subordinated Debt Securities and the payment of all amounts then due, the
Company may commence a new Extension Period, subject to the above
requirements. See "Description of the Subordinated Debt Securities--Interest"
"--Option to Extend Interest Payment Period" and "--Certain Covenants." If
Distributions are deferred, the Distributions due on such Capital Securities
will be paid on the date that the related Extension Period terminates, or, if
such date is not a Distribution Payment Date, on the immediately following
Distribution Payment Date, to holders of applicable Capital Securities as they
appear on the books and records of the Trust on the record date immediately
preceding such date.
 
  Distributions on the Capital Securities must be paid on the dates payable
(after giving effect to any Extension Period) to the extent that the Trust has
funds available for the payment of such Distributions in the Property Account.
The Trust's funds available for distribution to the holders of the Capital
Securities will be limited to payments received from the Company on the
Subordinated Debt Securities. See "Description of the Subordinated Debt
Securities." The payment of Distributions out of moneys held by the Trust is
guaranteed by the Company to the extent set forth under "Description of the
Guarantee."
 
  Distributions on the Capital Securities will be payable to the holders
thereof as they appear on the books and records of the Trust on the relevant
record dates, which, as long as the Capital Securities are held solely in
book-entry only form, will be one Business Day (as defined below) prior to the
relevant payment dates. Such distributions will be paid through the
Institutional Trustee who will hold amounts received in respect of the
Subordinated Debt Securities in the Property Account for the benefit of the
holders of the Trust Securities. Subject to any applicable laws and
regulations and the provisions of the Declaration, each such payment will be
made as described under "--Book-Entry Only Issuance--The Depository Trust
Company." At any time when the Capital Securities are not held solely in book-
entry only form, the Administrators shall select record dates, which shall be
15 days prior to the relevant payment date. In the event that any date on
which Distributions are to be made on the Capital Securities is not a Business
Day, then payment of the Distributions payable on such date will be made on
the next succeeding day which is a Business Day (and without any interest or
other payment
 
                                      37
<PAGE>
 
in respect of any such delay) with the same force and effect as if made on
such payment date. A "Business Day" shall mean any day other than Saturday,
Sunday or any other day on which banking institutions in New York City (in the
State of New York) and St. Louis (in the State of Missouri) are permitted or
required by any applicable law to close.
 
REDEMPTION
 
  The Subordinated Debt Securities will mature on February 1, 2027. The
Subordinated Debt Securities may be redeemed by the Company, in whole or in
part, at any time and from time to time on or after February 1, 2007, at par,
plus accrued and unpaid interest thereon to the date of redemption. In
addition, the Subordinated Debt Securities may be redeemed by the Company at
any time, in whole or in part, in certain circumstances described herein upon
the occurrence and continuation of a Tax Event or a Capital Treatment Event,
within 90 days following the occurrence of such Tax Event or Capital Treatment
Event, as the case may be, at par, together with accrued and unpaid interest
thereon to the date of redemption, upon not less than 30 nor more than 60
days' notice to holders of such Subordinated Debt Securities. In each case,
the right of the Company to redeem the Subordinated Debt Securities is subject
to the Company having received prior approval from the Federal Reserve, if
then required under applicable capital guidelines or policies of the Federal
Reserve.
 
  Upon the repayment in full at maturity or redemption in whole or in part of
the Subordinated Debt Securities (other than following the distribution of the
Subordinated Debt Securities to the holders of the Trust Securities), the
proceeds from such repayment or payment shall concurrently be applied to
redeem on a pro rata basis at the applicable Redemption Price, Trust
Securities having an aggregate liquidation amount equal to the aggregate
principal amount of the Subordinated Debt Securities so repaid or redeemed;
provided, however, that holders of such Trust Securities shall be given not
less than 30 nor more than 60 days' notice of such redemption (other than at
the scheduled maturity of the Subordinated Debt Securities). See "Description
of the Subordinated Debt Securities--Redemption." In the event that fewer than
all of the outstanding Capital Securities are to be redeemed, the Capital
Securities held in book-entry form will be redeemed in accordance with the
procedures of DTC as described under "--Book-Entry Only Issuance--The
Depository Trust Company."
 
  "Tax Event" means the receipt by the Institutional Trustee of an opinion of
a nationally recognized independent tax counsel to the Company experienced in
such matters to the effect that, as a result of (a) any amendment to,
clarification of or change (including any announced prospective change) in,
the laws (or any regulations thereunder) of the United States or any political
subdivision or taxing authority thereof or therein, (b) any judicial decision
or official administrative pronouncement, ruling, regulatory procedure, notice
or announcement, including any notice or announcement of intent to adopt such
procedures or regulations (an "Administrative Action") or (c) any amendment
to, clarification of or change in the administrative position or
interpretation of any Administrative Action or judicial decision that differs
from the theretofore generally accepted position, in each case, by any
legislative body, court, governmental agency or regulatory body, irrespective
of the manner in which such amendment, clarification or change is made known,
which amendment, clarification or change is effective or such Administrative
Action or decision is announced, in each case, on or after the date of this
Prospectus, there is more than an insubstantial risk that (i) the Trust is, or
will be within 90 days of the date thereof, subject to United States federal
income tax with respect to interest accrued or received on the Subordinated
Debt Securities or subject to more than a de minimis amount of other taxes,
duties or other governmental charges, or (ii) any portion of interest payable
by the Company to the Trust on the Subordinated Debt Securities is not, or
within 90 days of the date thereof will not be, deductible by the Company for
United States federal income tax purposes.
 
  "Capital Treatment Event" means the Company shall have received an opinion
of independent bank regulatory counsel experienced in such matters to the
effect that, as a result of (a) any amendment to, or change (including any
announced prospective change) in, the laws (or any rules or regulations
thereunder) of the United States or any rules, guidelines or policies of the
Federal Reserve or (b) any official or administrative pronouncement or action
or judicial decision interpreting or applying such laws or regulations, which
amendment or change is effective or such pronouncement, action or decision is
announced on or after the date of original
 
                                      38
<PAGE>
 
issuance of the Capital Securities, the Company will not be entitled to treat
the Capital Securities or the Subordinated Debt Securities, if the
Subordinated Debt Securities were to be distributed following the occurrence
of a Tax Event as described in the proviso to this paragraph, as "Tier 1
Capital" (or the equivalent thereof) for purposes of the risk-based capital
adequacy guidelines of the Federal Reserve, as then in effect and applicable
to the Company; provided, however, that the distribution of the Subordinated
Debt Securities in connection with the liquidation of the Trust by the Company
shall not in and of itself constitute a Capital Treatment Event unless such
liquidation shall have occurred in connection with a Tax Event.
 
REDEMPTION PROCEDURES
 
  The Trust may not redeem fewer than all of the outstanding Capital
Securities unless all accrued and unpaid Distributions have been paid on all
such Capital Securities for all quarterly Distribution periods terminating on
or prior to the date of redemption.
 
  If the Trust gives a notice of redemption in respect of the Capital
Securities (which notice will be irrevocable), then by 12:00 noon, New York
City time, on the redemption date, provided that the Institutional Trustee has
a sufficient amount of cash in connection with the related redemption or
maturity of the Subordinated Debt Securities, the Institutional Trustee will
irrevocably deposit with the Depositary or its nominee funds sufficient to pay
the applicable Redemption Price and will give the Depositary irrevocable
instructions and authority to pay such Redemption Price to the holders of such
Capital Securities. See "--Book-Entry Only Issuance--The Depository Trust
Company." With respect to the Capital Securities that are Certificated
Securities (as defined herein), provided that the Company has paid to the
Institutional Trustee a sufficient amount of cash in connection with the
related redemption or maturity of the Subordinated Debt Securities, the
Institutional Trustee will pay the applicable Redemption Price to the holders
of such Capital Securities by check mailed to the address of each such holder
appearing on the books and records of the Trust on the redemption date. If
notice of redemption shall have been given and funds deposited as required,
then, immediately prior to the close of business on the date of such deposit,
Distributions will cease to accrue on the Capital Securities and all rights of
holders of such Capital Securities will cease, except the right of the holders
of such Capital Securities to receive the applicable Redemption Price but
without interest on such Redemption Price. In the event that any date fixed
for redemption of the Capital Securities is not a Business Day, then payment
of the Redemption Price payable on such date will be made on the next
succeeding day that is a Business Day (without any interest or other payment
in respect of any such delay), except that, if such Business Day falls in the
next calendar year, such payment will be made on the immediately preceding
Business Day. In the event that payment of the Redemption Price in respect of
the Capital Securities is improperly withheld or refused and not paid either
by the Institutional Trustee or by the Company pursuant to the Guarantee,
Distributions on such Capital Securities will continue to accrue at the then
applicable rate from the original redemption date to the actual date of
payment, in which case the actual payment date will be considered the date
fixed for redemption for purposes of calculating the Redemption Price.
 
  In the event that fewer than all of the outstanding Capital Securities are
to be redeemed, Capital Securities will be redeemed on a pro rata basis in
accordance with the procedures of DTC as described under "--Book-Entry Only
Issuance--The Depository Trust Company."
 
  In the event of any redemption of the Capital Securities in part, the Trust
shall not be required to (i) issue, register the transfer of or exchange any
Certificated Security (as defined herein) during a period beginning at the
opening of business 15 days before any selection for redemption of the Capital
Securities and ending at the close of business on the earliest date on which
the relevant notice of redemption is deemed to have been given to all holders
of the Capital Securities to be so redeemed or (ii) register the transfer of
or exchange any Certificated Securities so selected for redemption, in whole
or in part, except for the unredeemed portion of any Certificated Securities
being redeemed in part.
 
                                      39
<PAGE>
 
  Subject to the foregoing and applicable law (including, without limitation,
United States federal securities laws), provided that the acquiror is not the
holder of the Common Securities or the obligor under the Subordinated Debt
Securities, the Company or its subsidiaries may at any time, and from time to
time, purchase outstanding Capital Securities by tender, in the open market or
by private agreement.
 
LIQUIDATION DISTRIBUTION UPON DISSOLUTION
 
  In the event of the voluntary or involuntary liquidation, dissolution,
winding-up or termination of the Trust (each a "Liquidation") other than in
connection with a redemption of the Subordinated Debt Securities as previously
described, the holders of the Capital Securities will be entitled to receive
out of the assets of the Trust, after satisfaction of liabilities to creditors
of the Trust (to the extent not satisfied by the Company), Distributions in an
amount equal to the aggregate of the stated liquidation amount of $1,000 per
Capital Security plus accrued and unpaid Distributions thereon to the date of
payment (the "Liquidation Distribution"), unless, in connection with such
Liquidation, the Subordinated Debt Securities in an aggregate stated principal
amount equal to the aggregate stated liquidation amount of the Trust
Securities have been distributed on a pro rata basis to the holders of the
Trust Securities in exchange for the Trust Securities. Upon any Liquidation in
which the Subordinated Debt Securities are distributed, if at the time of such
Liquidation the Capital Securities are rated by at least one nationally
recognized statistical rating organization, the Company will use its best
efforts to obtain from at least one nationally recognized statistical rating
organization a rating for the Subordinated Debt Securities.
 
  The Company, as the holder of all of the Common Securities, has the right at
any time to dissolve the Trust (including, without limitation, upon the
occurrence of a Tax Event or Capital Treatment Event), subject to the receipt
by the Company of prior approval from the Federal Reserve, if then required
under applicable capital guidelines or policies of the Federal Reserve, and,
after satisfaction of liabilities to creditors of the Trust (to the extent not
satisfied by the Company), cause the Subordinated Debt Securities to be
distributed to the holders of the Trust Securities on a pro rata basis in
accordance with the aggregate stated liquidation amount thereof, in
liquidation of the Trust.
 
  Pursuant to the Declaration, the Trust shall dissolve on the first to occur
of (i) February 1, 2052, the expiration of the term of the Trust, (ii) the
bankruptcy of the Company, (iii) (other than in connection with a merger,
consolidation or similar transaction not prohibited by the Indenture, the
Declaration or the Guarantee, as the case may be) the filing of a certificate
of dissolution or its equivalent with respect to the Trust, upon the consent
of the holders of at least a majority in liquidation amount of the Trust
Securities voting together as a single class to file a certificate of
cancellation with respect to the Trust, or upon the revocation of the charter
of the Company and the expiration of 90 days after the date of revocation
without a reinstatement thereof, (iv) the distribution to the holders of the
Trust Securities of the Subordinated Debt Securities, upon exercise of the
right of the holder of all of the outstanding Common Securities of the Trust
to dissolve the Trust as described above, (v) the entry of a decree of
judicial dissolution of the Company or the Trust, or (vi) the redemption of
all of the Trust Securities. Pursuant to the Declaration, as soon as
practicable after the dissolution of the Trust and upon completion of the
winding up of the Trust, the Trust shall terminate upon the filing of a
certificate of cancellation.
 
  If a Liquidation occurs as described in clause (i), (ii), (iii) or (v) of
the preceding paragraph, the Trust shall be liquidated by the Institutional
Trustee as expeditiously as such Institutional Trustee determines to be
possible by distributing to the holders of the Trust Securities, after
satisfaction of liabilities to creditors of the Trust to the extent not
satisfied by the Company, the Subordinated Debt Securities, unless such
distribution is determined by the Institutional Trustee not to be practical,
in which event such holders will be entitled to receive out of the assets of
the Trust available for distribution to holders, after satisfaction of
liabilities to creditors of the Trust to the extent not satisfied by the
Company, an amount equal to the Liquidation Distribution. An early Liquidation
of the Trust pursuant to clause (iv) above shall occur only if the
Institutional Trustee determines that such Liquidation is possible by
distributing to the holders of the Trust Securities, after satisfaction of
liabilities to creditors of the Trust to the extent not satisfied by the
Company, the Subordinated Debt Securities, and such distribution occurs.
 
 
                                      40
<PAGE>
 
  If, upon any such Liquidation, the Liquidation Distribution can be paid only
in part because the Trust has insufficient assets available to pay in full the
aggregate Liquidation Distribution, then the amounts payable directly by the
Trust on such Capital Securities shall be paid to the holders of the Trust
Securities on a pro rata basis. The holders of the Common Securities issued by
the Trust will be entitled to receive distributions upon any such Liquidation
pro rata with the holders of such Capital Securities, except that if a
Declaration Event of Default has occurred and is continuing in respect of the
Trust, the Capital Securities shall have a preference over the Common
Securities with regard to such distributions.
 
  After the date for any distribution of the Subordinated Debt Securities upon
dissolution of the Trust, (i) the Trust Securities will be deemed to be no
longer outstanding, (ii) the Depositary (as defined herein) or its nominee, as
the record holder of the Capital Securities issued in book-entry form, will
receive a registered Global Certificate (as defined herein) or Certificates
representing the Subordinated Debt Securities to be delivered upon such
distribution, and (iii) any certificates representing the Capital Securities
not held by the Depositary or its nominee will be deemed to represent
undivided beneficial interests in the Subordinated Debt Securities having an
aggregate principal amount equal to the aggregate stated liquidation amount of
such Capital Securities until such certificates are presented to the Company
or its agent for transfer or reissuance.
 
  There can be no assurance as to the market prices for either the Capital
Securities or the Subordinated Debt Securities that may be distributed in
exchange for the Capital Securities if a dissolution and liquidation of the
Trust were to occur. Accordingly, the Capital Securities that an investor may
acquire, whether pursuant to the Exchange Offer made hereby or in the
secondary market, or the Subordinated Debt Securities that an investor may
receive if a dissolution and liquidation of the Trust were to occur, may trade
at a discount to the price paid to purchase the Capital Securities offered
hereby.
 
DECLARATION EVENTS OF DEFAULT
 
  An event of default under the Indenture in respect of the Subordinated Debt
Securities (an "Indenture Event of Default") constitutes an event of default
under the Declaration with respect to the Trust Securities (each a
"Declaration Event of Default"); provided that pursuant to the Declaration,
the holder of the Common Securities will be deemed to have waived any
Declaration Event of Default with respect to such Common Securities until all
Declaration Events of Default with respect to the Capital Securities have been
cured, waived or otherwise eliminated. Until such Declaration Events of
Default have been so cured, waived, or otherwise eliminated, the Institutional
Trustee will be deemed to be acting solely on behalf of the holders of the
Capital Securities and only the holders of such Capital Securities will have
the right to direct the Institutional Trustee with respect to certain matters
under the Declaration, and therefore the Indenture. The holders of a majority
in liquidation amount of the Capital Securities will have the right to direct
the time, method and place of conducting any proceeding for any remedy
available to the Institutional Trustee or to direct the exercise of any trust
or power conferred upon the Institutional Trustee under the Declaration,
including the right to direct the Institutional Trustee to exercise the
remedies available to it as holder of the Subordinated Debt Securities. If the
Institutional Trustee fails to enforce its rights under the Subordinated Debt
Securities after the holders of a majority in liquidation amount of the
Capital Securities have so directed the Institutional Trustee, to the fullest
extent permitted by law, a holder of record of such Capital Securities may
institute a legal proceeding against the Company to enforce the Institutional
Trustee's rights under the Subordinated Debt Securities without first
instituting any legal proceeding against the Institutional Trustee or any
other person or entity. Notwithstanding the foregoing, if a Declaration Event
of Default has occurred and is continuing and such event is attributable to
the failure of the Company to pay interest or principal on the Subordinated
Debt Securities on the respective dates such interest or principal is payable
(or in the case of redemption, the redemption date), then a holder of record
of such Capital Securities may institute a Direct Action against the Company
for payment, on or after the respective due dates specified in the
Subordinated Debt Securities, to such holder directly of the principal of or
interest on Subordinated Debt Securities having an aggregate principal amount
equal to the aggregate liquidation amount of the Capital Securities of such
holder. In connection with such Direct Action, the Company will be subrogated
to the rights of such holder of Capital Securities under the Declaration to
the extent of any payment
 
                                      41
<PAGE>
 
made by the Company to such holder of the Capital Securities in such Direct
Action; provided, however, that no such subrogation right may be exercised so
long as a Declaration Event of Default has occurred and is continuing. The
holders of the Capital Securities will not be able to exercise directly any
other remedy available to the holders of the Subordinated Debt Securities.
 
  Upon the occurrence of a Declaration Event of Default, the Institutional
Trustee, so long as it is the sole holder of the Subordinated Debt Securities,
will have the right under the Indenture to declare the principal of and
interest on the Subordinated Debt Securities to be immediately due and
payable. The Company and the Trust are each required to file annually with the
Institutional Trustee an officer's certificate as to its compliance with all
conditions and covenants under the Declaration.
 
VOTING RIGHTS
 
  Except as described below, under the Trust Act and under "--Removal of
Issuer Trustees; Appointment of Successors" and "Description of the
Guarantee--Modification of the Guarantee; Assignment," and as otherwise
required by law and the Declaration, the holders of the Capital Securities
will have no voting rights.
 
  Subject to the requirements set forth in this paragraph, the holders of a
majority in aggregate liquidation amount of the Capital Securities have the
right to direct the time, method and place of conducting any proceeding for
any remedy available to the Institutional Trustee, or exercising any trust or
power conferred upon such Institutional Trustee under the Declaration,
including the right to direct such Institutional Trustee, as holder of the
Subordinated Debt Securities, to (i) exercise the remedies available to it
under the Indenture as a holder of the Subordinated Debt Securities, (ii)
waive any past default that is waivable under the Indenture, (iii) exercise
any right to rescind or annul a declaration that the principal of all the
Subordinated Debt Securities shall be due and payable or (iv) consent on
behalf of all the holders of the Capital Securities of the Trust to any
amendment, modification or termination of the Indenture or the Subordinated
Debt Securities where such consent shall be required; provided, however, that
where a consent or action under the Indenture would require the consent or act
of holders of more than a simple majority in principal amount of the
Subordinated Debt Securities (a "Super-Majority") affected thereby, the
Institutional Trustee may only give such consent or take such action at the
written direction of the holders of at least the proportion in aggregate
liquidation amount of the Capital Securities outstanding which the relevant
Super-Majority represents of the aggregate principal amount of the
Subordinated Debt Securities outstanding. If the Institutional Trustee fails
to enforce its rights under the Subordinated Debt Securities after the holders
of a majority in liquidation amount of such Capital Securities have so
directed the Institutional Trustee, to the extent permitted by law, a holder
of record of the Capital Securities may institute a legal proceeding directly
against the Company to enforce the Institutional Trustee's rights under the
Subordinated Debt Securities without first instituting any legal proceeding
against the Institutional Trustee or any other person or entity.
Notwithstanding the foregoing, if a Declaration Event of Default has occurred
and is continuing and such event is attributable to the failure of the Company
to pay interest or principal on the Subordinated Debt Securities on the
respective dates such interest or principal is payable (or in the case of
redemption, the redemption date) then a holder of record of the Capital
Securities may institute a Direct Action against the Company for payment, on
or after the respective due dates specified in the Subordinated Debt
Securities, to such holder directly of the principal of or interest on the
Subordinated Debt Securities having an aggregate principal amount equal to the
aggregate liquidation amount of the Capital Securities of such holder. The
Institutional Trustee shall notify all holders of the Capital Securities of
any default actually known to the Institutional Trustee with respect to the
Subordinated Debt Securities unless (x) such default has been cured prior to
the giving of such notice or (y) the Institutional Trustee determines in good
faith that the withholding of such notice is in the interest of the holders of
such Capital Securities, except where the default relates to the payment of
interest or principal of on any of the Subordinated Debt Securities. Such
notice shall state that such Indenture Event of Default also constitutes a
Declaration Event of Default. Except with respect to directing the time,
method and place of conducting a proceeding for a remedy, the Institutional
Trustee shall not take any of the actions described in clauses (i), (ii) or
(iii) above unless the Institutional Trustee has obtained an opinion of tax
counsel
 
                                      42
<PAGE>
 
to the effect that, as a result of such action, the Trust will not be
classified as other than a grantor trust for United States federal income tax
purposes.
 
  In the event the consent of the Institutional Trustee, as the holder of the
Subordinated Debt Securities, is required under the Indenture with respect to
any amendment, modification or termination of the Indenture, such
Institutional Trustee shall request the direction of the holders of the Trust
Securities with respect to such amendment, modification or termination and
shall vote with respect to such amendment, modification or termination as
directed by a majority in liquidation amount of such Trust Securities voting
together as a single class; provided, however, that where a consent under the
Indenture would require the consent of a Super-Majority, the Institutional
Trustee may only give such consent at the direction of the holders of at least
the proportion in liquidation amount of such Trust Securities outstanding
which the relevant Super-Majority represents of the aggregate principal amount
of the Subordinated Debt Securities outstanding. The Institutional Trustee
shall not take any such action in accordance with the directions of the
holders of such Trust Securities unless the Institutional Trustee has obtained
an opinion of tax counsel to the effect that, as a result of such action, the
Trust will not be classified as other than a grantor trust for United States
federal income tax purposes.
 
  A waiver of an Indenture Event of Default will constitute a waiver of the
corresponding Declaration Event of Default.
 
  Any required approval or direction of holders of the Capital Securities may
be given at a separate meeting of such holders convened for such purpose, at a
meeting of all of the holders of Trust Securities or pursuant to written
consent. The Institutional Trustee will cause a notice of any meeting at which
holders of the Capital Securities are entitled to vote, or of any matter upon
which action by written consent of such holders is to be taken, to be mailed
to each holder of record of the Capital Securities. Each such notice will
include a statement setting forth the following information: (i) the date of
such meeting or the date by which such action is to be taken; (ii) a
description of any resolution proposed for adoption at such meeting on which
such holders are entitled to vote or of such matter upon which written consent
is sought; and (iii) instructions for the delivery of proxies or consents. No
vote or consent of the holders of the Capital Securities will be required for
the Trust to redeem and cancel the Capital Securities or distribute the
Subordinated Debt Securities in accordance with the Declaration.
 
  Notwithstanding that holders of the Capital Securities are entitled to vote
or consent under any of the circumstances described above, any of the Capital
Securities that are owned at such time by the Company or any entity directly
or indirectly controlling or controlled by, or under direct or indirect common
control with, the Company, shall not entitle the holders thereof to vote or
consent and shall, for purposes of such vote or consent, be treated as if such
Capital Securities were not outstanding.
 
  The procedures by which holders of the Capital Securities issued in book-
entry form may exercise their voting rights are described below. See "--Book-
Entry Only Issuance--The Depository Trust Company" below.
 
REMOVAL OF INSTITUTIONAL TRUSTEES; APPOINTMENT OF SUCCESSORS
 
  If an Indenture Event of Default has occurred and is continuing, an
Institutional Trustee may be removed and its successor appointed by the
holders of at least a majority in liquidation amount of Capital Securities. In
no event will the holders of the Capital Securities have the right to vote to
appoint, remove or replace the Administrators, which voting rights are vested
exclusively in the Company as the holder of the Common Securities. No
resignation or removal of an Institutional Trustee and no appointment of a
successor trustee shall be effective until the acceptance of appointment by
the successor trustee in accordance with the provisions of the Declaration.
 
 
                                      43
<PAGE>
 
MODIFICATION OF THE DECLARATION
 
  The Declaration may be amended from time to time by the Institutional
Trustee and the holders of a majority of the Common Securities without the
consent of the holders of the Capital Securities to: (i) cure any ambiguity;
(ii) correct or supplement any provision in such Declaration that may be
defective or inconsistent with any other provision of such Declaration; (iii)
add to the covenants, restrictions or obligations of the Company; (iv) modify,
eliminate or add to any provision of the Declaration to such an extent as may
be necessary to ensure that the Trust will be classified for United States
federal income tax purposes at all times as a grantor trust and will not be
required to register as an "investment company" under the Investment Company
Act of 1940, as amended (the "1940 Act") (including, without limitation, to
conform to any change in Rule 3a-5, Rule 3a-7 or any other applicable rule
under the 1940 Act or written change in interpretation or application thereof
by any legislative body, court, government agency or regulatory authority),
which amendment does not have a material adverse effect on the right,
preferences or privileges of the holders of the Capital Securities; and (v)
modify, eliminate and add to any provision of such Declaration, provided that
no such modification, elimination or addition referred to in clauses (i),
(ii), (iii) and (v) hereof shall adversely affect the powers, preferences or
special rights of the holders of such Capital Securities so long as they
remain outstanding.
 
  In addition, the Declaration may be modified and amended if approved by the
Institutional Trustee and the holders of a majority of the Common Securities
(and in certain circumstances the Delaware Trustee), provided that, if any
proposed amendment provides for, or the Institutional Trustee otherwise
proposes to effect, (i) any action that would adversely affect the powers,
preferences or special rights of the Trust Securities, whether by way of
amendment to the Declaration or otherwise or (ii) the Liquidation of the Trust
other than pursuant to the terms of the Declaration, then the holders of the
Trust Securities voting together as a single class will be entitled to vote on
such amendment or proposal and such amendment or proposal shall not be
effective except with the approval of the holders of at least a majority in
liquidation amount of the Trust Securities affected thereby; provided that if
any amendment or proposal referred to in clause (i) above would adversely
affect only the Capital Securities or only the Common Securities, then only
the affected class will be entitled to vote on such amendment or proposal and
such amendment or proposal shall not be effective except with the approval of
a majority in liquidation amount of such class of Trust Securities.
 
  Notwithstanding the foregoing, no amendment or modification may be made to
the Declaration if such amendment or modification would (i) cause the Trust to
be classified for purposes of United States federal income taxation as other
than a grantor trust or (ii) cause the Trust to be deemed an "investment
company" which is required to be registered under the 1940 Act.
 
  Notwithstanding any provision of the Declaration, the provisions of Section
316(b) of the Trust Indenture Act incorporated by reference into the
Declaration provides that the right of any holder of the Capital Securities to
receive payments of Distributions and other payments upon redemption or
otherwise on or after their respective due dates, or to institute suit for the
enforcement of any such payment on or after such respective dates, shall not
be impaired or affected without the consent of such holder.
 
MERGERS, CONSOLIDATIONS OR AMALGAMATIONS
 
  The Trust may not consolidate, amalgamate, merge with or into, or be
replaced by, or convey, transfer or lease its properties and assets
substantially as an entirety to, any corporation or other body, except as
described below or as otherwise described in "--Liquidation Distribution Upon
Dissolution." The Trust may, with the consent of the Institutional Trustee and
without the consent of the Delaware Trustee or the holders of the Capital
Securities, consolidate, amalgamate, merge with or into, or be replaced by, a
trust organized as such under the laws of any state of the United States;
provided that (i) if the Trust is not the survivor, such successor entity
either (x) expressly assumes all of the obligations of the Trust under the
Trust Securities or (y) substitutes for the Trust Securities other securities
having substantially the same terms as the Trust Securities (the "Successor
Securities"), so that the Successor Securities rank the same as the Trust
Securities rank with respect to Distributions and payments upon liquidation,
redemption and otherwise, (ii) a trustee of such successor entity
 
                                      44
<PAGE>
 
possessing the same powers and duties as the Institutional Trustee is
appointed as the holder of the Subordinated Debt Securities, (iii) such
merger, consolidation, amalgamation or replacement does not cause the Capital
Securities (including any Successor Securities) to be downgraded by any
nationally recognized statistical rating organization, (iv) such merger,
consolidation, amalgamation or replacement does not adversely affect the
rights, preferences and privileges of the holders of such Trust Securities
(including any Successor Securities) in any material respect (other than with
respect to any dilution of the holders' interest in such successor entity),
(v) such successor entity has a purpose substantially identical to that of the
Trust, (vi) prior to such merger, consolidation, amalgamation or replacement,
the Trust has received an opinion of a nationally recognized independent
counsel to the Trust experienced in such matters to the effect that (A) such
merger, consolidation, amalgamation or replacement does not adversely affect
the rights, preferences and privileges of the holders of the Trust Securities
(including any Successor Securities) in any material respect (other than with
respect to any dilution of the holders' interest in such successor entity),
(B) following such merger, consolidation, amalgamation or replacement, neither
the Trust nor such successor entity will be required to register as an
investment company under the 1940 Act and (C) following such merger,
consolidation, amalgamation or replacement, neither the Trust nor such
successor entity will be classified as other than a grantor trust for United
States federal income tax purposes, and (vii) the Company guarantees the
obligations of such successor entity under the Successor Securities at least
to the extent provided by the Guarantee. Notwithstanding the foregoing, the
Trust shall not, except with the consent of holders of 100% in liquidation
amount of the Trust Securities, consolidate, amalgamate, merge with or into,
or be replaced by, any other entity or permit any other entity to consolidate,
amalgamate, merge with or into, or replace it, if such consolidation,
amalgamation, merger or replacement would cause the Trust or the successor
entity to be classified as other than a grantor trust for United States
federal income tax purposes. In addition, the Indenture Trustee will be
required pursuant to the Indenture to exchange for Subordinated Debt
Securities, as part of the Exchange Offer, Exchange Securities that will have
terms identical in all material respects to the Subordinated Debt Securities
except for the transfer restrictions under the Securities Act and the
provision for an increase in the interest rate thereon under certain
circumstances. See "--Exchange Offer; Registration Rights."
 
BOOK-ENTRY ONLY ISSUANCE--THE DEPOSITORY TRUST COMPANY
 
  The description of book-entry procedures in this Prospectus includes
summaries of certain rules and operating procedures of DTC that affect
transfers of interests in the global certificate or certificates issued in
connection with sales of Capital Securities. Except as described in the next
paragraph, the Capital Securities will be issued only as fully registered
securities registered in the name of Cede & Co. (as nominee for DTC). One or
more fully registered global Capital Security certificates (the "Global
Certificates") will be issued, representing, in the aggregate, the New Capital
Securities, and will be deposited with DTC.
 
  The laws of some jurisdictions require that certain purchasers of securities
take physical delivery of securities in definitive form. Such laws may impair
the ability to transfer beneficial interests in the global Capital Securities
as represented by a Global Certificate.
 
  DTC is a limited-purpose trust company organized under the New York Banking
Law, a "banking organization" within the meaning of the New York Banking Law,
a member of the Federal Reserve System, a "clearing corporation" within the
meaning of the New York Uniform Commercial Code and a "clearing agency"
registered pursuant to the provisions of Section 17A of the Exchange Act. DTC
holds securities that its participants ("Participants") deposit with DTC. DTC
also facilitates the settlement among Participants of securities transactions,
such as transfers and pledges, in deposited securities through electronic
computerized book-entry changes in Participants' accounts, thereby eliminating
the need for physical movement of securities certificates. Participants in DTC
include securities brokers and dealers, banks, trust companies, clearing
corporations and certain other organizations ("Direct Participants"). DTC is
owned by a number of its Direct Participants and by the New York Stock
Exchange Inc., the American Stock Exchange, Inc., and the National Association
of Securities Dealers, Inc. Access to the DTC system is also available to
others, such as securities brokers and dealers, banks and trust companies that
clear transactions through or maintain a direct or indirect
 
                                      45
<PAGE>
 
custodial relationship with a Direct Participant, either directly or
indirectly ("Indirect Participants"). The rules applicable to DTC and its
Participants are on file with the Commission.
 
  Purchases of the Capital Securities within the DTC system must be made by or
through Direct Participants, which will receive a credit for the Capital
Securities on DTC's records. The ownership interest of each actual purchaser
of each Capital Security ("Beneficial Owner") is in turn to be recorded on the
Direct Participants' and Indirect Participants' records. Beneficial Owners
will not receive written confirmation from DTC of their purchases, but
Beneficial Owners are expected to receive written confirmations providing
details of the transactions, as well as periodic statements of their holdings,
from the Direct Participants or Indirect Participants through which the
Beneficial Owners purchased the Capital Securities. Transfers of ownership
interests in the Capital Securities are to be accomplished by entries made on
the books of Participants acting on behalf of Beneficial Owners. Beneficial
Owners will not receive certificates representing their ownership interests in
the Capital Securities, except in the event that use of the book-entry system
for the Capital Securities is discontinued.
 
  To facilitate subsequent transfers, all the Capital Securities deposited by
Participants with DTC will be registered in the name of DTC's nominee, Cede &
Co. The deposit of the Capital Securities with DTC and their registration in
the name of Cede & Co. will effect no change in beneficial ownership. DTC will
have no knowledge of the actual Beneficial Owners of the Capital Securities.
DTC's records will reflect only the identity of the Direct Participants to
whose accounts such Capital Securities are credited, which may or may not be
the Beneficial Owners. The Direct Participants and Indirect Participants will
remain responsible for keeping account of their holdings on behalf of their
customers.
 
  So long as DTC, or its nominee, is the registered owner or holder of a
Global Certificate in respect of the Capital Securities, DTC or such nominee,
as the case may be, will be considered the sole owner or holder of the Capital
Securities represented thereby for all purposes under the Declaration and such
Capital Securities. No Beneficial Owner of an interest in a Global Certificate
will be able to transfer that interest except in accordance with DTC's
applicable procedures.
 
  DTC has advised the Company that it will take any action permitted to be
taken by a holder of the Capital Securities (including the presentation of the
Capital Securities for exchange as described below) only at the direction of
one or more Participants to whose accounts the DTC interest in the Global
Certificates is credited and only in respect of such portion of the aggregate
liquidation amount of the Capital Securities as to which such Participant or
Participants has or have given such direction. However, if there is a
Declaration Event of Default with respect to the Capital Securities, DTC will,
upon notice, exchange the Global Certificates in respect of such Capital
Securities for Certificated Securities, which it will distribute to its
Participants.
 
  Conveyance of notices and other communications by DTC to Direct
Participants, by Direct Participants to Indirect Participants, and by Direct
Participants and Indirect Participants to Beneficial Owners will be governed
by arrangements among them, subject to any statutory or regulatory
requirements as may be in effect from time to time.
 
  Redemption notices in respect of the Capital Securities held in book-entry
form will be sent to Cede & Co. If less than all of the Capital Securities are
being redeemed, the Capital Securities will be redeemed on a pro rata basis.
 
  Although voting with respect to the Capital Securities is limited, in those
cases where a vote is required, neither DTC nor Cede & Co. will itself consent
or vote with respect to the Capital Securities. Under its usual procedures,
DTC would mail an omnibus proxy to the Trust as soon as possible after the
record date. The omnibus proxy assigns Cede & Co.'s consenting or voting
rights to those Direct Participants to whose accounts the Capital Securities
are credited on the record date (identified in a listing attached to the
omnibus proxy).
 
  Distributions on the Capital Securities held in book-entry form will be made
to DTC in immediately available funds. DTC's practice is to credit Direct
Participants' accounts on the relevant payment date in
 
                                      46
<PAGE>
 
accordance with their respective holdings shown on DTC's records unless DTC
has reason to believe that it will not receive payments on such payment date.
Payments by Direct Participants and Indirect Participants to Beneficial Owners
will be governed by standing instructions and customary practices and will be
the responsibility of such Direct Participants and Indirect Participants and
not of DTC, the Trust or the Company, subject to any statutory or regulatory
requirements as may be in effect from time to time. Payment of distributions
to DTC is the responsibility of the Trust, disbursement of such payments to
Direct Participants is the responsibility of DTC, and disbursement of such
payments to the Beneficial Owners is the responsibility of Direct Participants
and Indirect Participants.
 
  Except as provided herein, a Beneficial Owner of an interest in a Global
Certificate will not be entitled to receive physical delivery of the Capital
Securities. Accordingly, each Beneficial Owner must rely on the procedures of
DTC, the Direct Participants and the Indirect Participants to exercise any
rights under the Capital Securities.
 
  Although DTC has agreed to the foregoing procedures in order to facilitate
transfers of interests in the Global Certificates among Participants of DTC,
DTC is under no obligation to perform or continue to perform such procedures,
and such procedures may be discontinued at any time. None of the Company, the
Trust or the Institutional Trustee will have any responsibility for the
performance by DTC or its Direct Participants or Indirect Participants under
the rules and procedures governing DTC. DTC may discontinue providing its
services as a securities depositary with respect to the Capital Securities at
any time by giving notice to the Trust. Under such circumstances, in the event
that a successor securities depositary is not obtained, the Capital Security
certificates will be required to be printed and delivered. Additionally, the
Trust (with the consent of the Company) may decide to discontinue use of the
system of book-entry transfers through DTC (or a successor depositary) with
respect to the Capital Securities of the Trust. In that event, certificates
for such Capital Securities will be printed and delivered.
 
  The information in this section concerning DTC and DTC's book-entry system
has been obtained from sources that the Company and the Trust believes to be
reliable, but neither the Company nor the Trust takes responsibility for the
accuracy thereof.
 
RESTRICTIONS ON TRANSFER
 
  The Capital Securities will be issued and may be transferred only in blocks
having a stated liquidation amount of not less that $100,000 (100 Capital
Securities). Any such transfer of the Capital Securities in a block having a
stated liquidation amount of less than $100,000 shall be deemed to be void and
of no legal effect whatsoever. Any such transferee shall be deemed not to be
the holder of such Capital Securities for any purpose, including but not
limited to, the receipt of Distributions on such Capital Securities, and such
transferee shall be deemed to have no interest whatsoever in such Capital
Securities.
 
PAYMENT AND PAYING AGENCY
 
  Payments in respect of the Capital Securities represented by the Global
Certificates shall be made to DTC, which shall credit the relevant accounts at
DTC on the applicable distribution payment dates or, in the case of
Certificated Securities in non-book entry form, such payments shall be made by
check mailed to the address of the holder entitled thereto as such address
shall appear on books and records of the Trust. The paying agent for the Trust
Securities (the "Paying Agent") shall initially be The Chase Manhattan Bank.
The Paying Agent shall be permitted to resign as Paying Agent upon 30 days'
written notice to the Institutional Trustee, the Administrators and the
Company. In the event that The Chase Manhattan Bank shall no longer be the
Paying Agent, the Institutional Trustee shall appoint a successor to act as
Paying Agent (which shall be a bank or trust company).
 
 
                                      47
<PAGE>
 
REGISTRAR AND TRANSFER AGENT
 
  The Institutional Trustee will act as registrar and transfer agent for the
Capital Securities of the Trust.
 
  Registration of transfers or exchanges of the Capital Securities will be
effected without charge by or on behalf of the Trust, but upon payment (with
the giving of such indemnity as the Trust or the Company may require) in
respect of any tax or other government charges which may be imposed in
relation to it.
 
  The Trust will not be required to register or cause to be registered the
transfer or exchange of the Capital Securities after such Capital Securities
have been called for redemption.
 
INFORMATION CONCERNING THE INSTITUTIONAL TRUSTEE
 
  The Institutional Trustee, prior to the occurrence of a default with respect
to the Trust Securities and after the curing of any defaults that may have
occurred, undertakes to perform only such duties as are specifically set forth
in the Declaration and, after default, shall exercise such of the rights and
powers vested in it by such Declaration, and use the same degree of care and
skill in their exercise, as a prudent individual would exercise or use in the
conduct of his or her own affairs. Subject to such provisions, the
Institutional Trustee is under no obligation to exercise any of the powers
vested in it by the Declaration at the request of any holder of the Capital
Securities, unless offered reasonable indemnity by such holder against the
costs, expenses and liabilities which might be incurred thereby. The holders
of the Capital Securities will not be required to offer such indemnity in the
event such holders, by exercising their voting rights, direct the
Institutional Trustee to take any action it is empowered to take under the
Declaration following a Declaration Event of Default. The Institutional
Trustee also serves as trustee under the Guarantee and the Indenture.
 
  Whenever in the exercise of its rights or powers or the performance of its
duties under the Declaration the Institutional Trustee shall deem it desirable
to receive instructions with respect to enforcing any remedy or right or
taking any other action thereunder, the Institutional Trustee (i) may request
instructions from the holders of the Capital Securities, which instructions
may only be given by the holders of a majority, or such other proportion, in
liquidation amount of the Capital Securities as would be entitled to direct
the Institutional Trustee under the terms of such Capital Securities in
respect of such remedy, right or action, (ii) may refrain from enforcing such
remedy or right or taking such other action until such instructions are
received, and (iii) shall be protected in conclusively relying on or acting in
or accordance with such instructions.
 
  The Company and certain of its affiliates maintain a banking relationship
with the Institutional Trustee and its affiliates.
 
GOVERNING LAW
 
  The Declaration and the Capital Securities will be governed by, and
construed in accordance with, the laws of the State of Delaware, without
regard to principles of conflict of laws.
 
MISCELLANEOUS
 
  The Administrators, the holders of a majority of the Common Securities and
the Institutional Trustee are authorized and directed to operate the Trust in
such a way so that the Trust will not be required to register as an
"investment company" under the 1940 Act nor be characterized as other than a
grantor trust for United States federal income tax purposes. The Company has
agreed to conduct its affairs so that the Subordinated Debt Securities will be
treated as indebtedness of the Company for United States federal income tax
purposes. In this connection, the Institutional Trustee and the holders of a
majority of the Common Securities are authorized to take any action, not
inconsistent with applicable law or the Declaration, that the Institutional
Trustee and such holders of the Common Securities determine in their
discretion to be necessary or desirable to achieve such end, even if such
action adversely affects the interests of the holders of the Capital
Securities.
 
  Holders of the Capital Securities have no preemptive or similar rights.
 
                                      48
<PAGE>
 
                         DESCRIPTION OF THE GUARANTEE
 
  The Old Guarantee was executed and delivered by the Company with the
issuance by the Trust of the Old Capital Securities for the benefit of the
holders from time to time of the Old Capital Securities. As soon as
practicable after the date hereof, the Old Guarantee will be exchanged by the
Company for the New Guarantee. The Old Guarantee will be of no force and
effect after such exchange. This summary of certain provisions of the New
Guarantee does not purport to be complete and is subject to, and qualified by
reference to, all of the provisions of the New Guarantee, including the
definitions therein of certain terms, and the Trust Indenture Act. The
Guarantee Trustee will hold the New Guarantee for the benefit of the holders
of the New Capital Securities, the Old Capital Securities and the Common
Securities.
 
GENERAL
 
  Pursuant to the Guarantee, the Company has irrevocably and unconditionally
agreed, to the extent set forth therein, to pay in full, to the holders of the
Capital Securities, the Guarantee Payments (as defined herein) (except to the
extent paid by the Trust), as and when due, regardless of any defense, right
of set-off or counterclaim which the Trust may have or assert. The following
payments with respect to the Capital Securities, to the extent not paid by the
Trust (the "Guarantee Payments"), are subject to the Guarantee (without
duplication): (i) any accrued and unpaid Distributions which are required to
be paid on the Capital Securities, to the extent the Trust shall have funds
available therefor; (ii) the Redemption Price, to the extent the Trust has
funds available therefor, with respect to any Capital Securities called for
redemption by the Trust; and (iii) upon Liquidation of the Trust (other than
in connection with the distribution of the Subordinated Debt Securities to the
holders of the Capital Securities in exchange therefor), the lesser of (a) the
aggregate of the liquidation amount and all accrued and unpaid Distributions
on such Capital Securities to the date of payment, to the extent the Trust has
funds available therefor, and (b) the amount of assets of the Trust remaining
available for distribution to holders of such Capital Securities in
liquidation of the Trust. The Company's obligation to make a Guarantee Payment
may be satisfied by direct payment of the required amounts by the Company to
the holders of the Capital Securities or by causing the Trust to pay such
amounts to such holders.
 
  The Guarantee does not apply to any payment of Distributions except to the
extent the Trust shall have funds available therefor, which funds will not be
available except to the extent the Company has made payments of interest or
principal or other payments on the Subordinated Debt Securities purchased by
the Trust. See "Description of the Subordinated Debt Securities--Certain
Covenants." The Guarantee, when taken together with the Company's obligations
under the Subordinated Debt Securities, the Declaration and the Indenture,
including its obligations to pay costs, expenses, debts and other obligations
of the Trust (other than with respect to the Trust Securities), provides a
full and unconditional guarantee on a subordinated basis by the Company of
payments due on the Capital Securities.
 
  Because the Guarantee is a guarantee of payment and not of collection,
holders of the Capital Securities may proceed directly against the Company,
rather than having to proceed against the Trust before attempting to collect
from the Company, and the Company waives any right or remedy to require that
any action be brought against the Trust or any other person or entity before
proceeding against the Company. Such obligations will not be discharged except
by payment of the Guarantee Payments in full. The Guarantee has been deposited
with the Guarantee Trustee to be held for the benefit of the holders of
Capital Securities. Except as otherwise noted herein, the Guarantee Trustee
has the right to enforce the Guarantee on behalf of the holders of the Capital
Securities.
 
  The Company has also agreed separately to irrevocably and unconditionally
guarantee the obligations of the Trust with respect to Common Securities (the
"Common Securities Guarantee") to the same extent as the Guarantee, except
that upon the occurrence and continuance of a Declaration Event of Default,
holders of Capital Securities shall have priority over holders of Common
Securities with respect to any payments made by the Company on or in respect
of the Trust Securities under the Guarantee and the Common Securities
Guarantee.
 
 
                                      49
<PAGE>
 
CERTAIN COVENANTS OF THE COMPANY UNDER THE GUARANTEE
 
  In the Guarantee, the Company covenants that, so long as any Capital
Securities remain outstanding, if the Company shall be in default under the
Guarantee or there shall have occurred and be continuing any event that would
constitute a Declaration Event of Default, under the Declaration, then (a) the
Company shall not declare or pay any dividend on, make a distribution with
respect to, or redeem, purchase or make a liquidation payment with respect to,
any of the Company's capital stock or rights to acquire such capital stock
(other than (i) purchases or acquisitions of shares of the Company's capital
stock or rights to acquire such capital stock in connection with the
satisfaction by the Company of its obligations under any employee benefit
plans, (ii) as a result of a reclassification of the Company's capital stock
or rights to acquire such capital stock or the exchange or conversion of one
class or series of the Company's capital stock or rights to acquire such
capital stock for another class or series of the Company's capital stock or
rights to acquire such capital stock, (iii) the purchase of fractional
interests in shares of the Company's capital stock pursuant to the conversion
or exchange provisions of such capital stock or the security being converted
or exchanged, (iv) dividends and distributions made on the Company's capital
stock or rights to acquire such capital stock with the Company's capital stock
or rights to acquire such capital stock, or (v) any declaration of a dividend
in connection with the implementation of a shareholder rights plan, or the
issuance of stock under any such plan in the future, or the redemption or
repurchase of any such rights pursuant thereto), or make any guarantee
payments (other than payments under the Guarantee and the Common Securities
Guarantee) with respect to the foregoing and (b) the Company shall not make
any payment of interest, principal or premium, if any, on or repay, repurchase
or redeem any debt securities issued by the Company that rank pari passu with
or junior to the Subordinated Debt Securities.
 
MODIFICATION OF THE GUARANTEE; ASSIGNMENT
 
  Except with respect to any changes which do not adversely affect the rights
of holders of the Capital Securities in any material respect (in which case no
vote of such holders will be required), the Guarantee may be amended only with
the prior approval of the holders of not less than a majority in liquidation
amount of the outstanding Capital Securities. All guarantees and agreements
contained in the Guarantee shall bind the successors, assigns, receivers,
trustees and representatives of the Company and shall inure to the benefit of
the holders of the Capital Securities then outstanding.
 
TERMINATION
 
  The Guarantee will terminate as to the Capital Securities (a) upon full
payment of the Redemption Price of all Capital Securities, (b) upon
distribution of the Subordinated Debt Securities to the holders of the Capital
Securities or (c) upon full payment of the amounts payable in accordance with
the Declaration upon liquidation of the Trust. The Guarantee will continue to
be effective or will be reinstated, as the case may be, if at any time any
holder of the Capital Securities must restore payment of any sums paid under
such the Capital Securities or the Guarantee.
 
EVENTS OF DEFAULT
 
  An event of default under the Guarantee will occur upon the failure of the
Company to perform any of its payment or other obligations thereunder.
 
  The holders of a majority in liquidation amount of the Capital Securities
have the right to direct the time, method and place of conducting any
proceeding for any remedy available to the Guarantee Trustee in respect of the
Guarantee or to direct the exercise of any trust or power conferred upon the
Guarantee Trustee under the Guarantee. A holder of record of the Capital
Securities may institute a legal proceeding directly against the Company to
enforce the Guarantee Trustee's rights under the Guarantee, without first
instituting a legal proceeding against the Trust, the Guarantee Trustee or any
other person or entity. Pursuant to the Guarantee, the Company waives any
right or remedy to require that any action be brought first against the Trust
or any other person or entity before proceeding directly against the Company.
 
                                      50
<PAGE>
 
STATUS OF THE GUARANTEE
 
  The Company's obligations under the Guarantee are subordinate and junior in
right of payment to all present and future Senior Indebtedness of the Company
and are also effectively subordinated to claims of creditors of the Company's
subsidiaries. The terms of the Capital Securities provide that each holder of
the Capital Securities by acceptance thereof agrees to the subordination
provisions and other terms of the Guarantee relating thereto. Because the
Company is a bank holding company, the right of the Company to participate in
any distribution of assets of any of its subsidiaries upon such subsidiary's
liquidation or reorganization or otherwise is subject to the prior claims of
creditors of that subsidiary, except to the extent the Company may itself be
recognized as a creditor of that subsidiary. Accordingly, the Company's
obligations under the Guarantee will be effectively subordinated to all
existing and future liabilities of the Company's subsidiaries, and claimants
should look only to the assets of the Company for payments thereunder. The
Guarantee does not limit the incurrence or issuance of other secured or
unsecured debt of the Company, including Senior Indebtedness of the Company,
under any indenture that the Company may enter into in the future or
otherwise.
 
INFORMATION CONCERNING THE GUARANTEE TRUSTEE
 
  The Guarantee Trustee, prior to the occurrence of a default with respect to
the Guarantee, undertakes to perform only such duties as are specifically set
forth in such Guarantee and, after default, shall exercise such of the rights
and powers vested in it by such Guarantee, and use the same degree of care and
skill in their exercise, as a prudent individual would exercise or use in the
conduct of his or her own affairs. Subject to such provisions, the Trustee is
under no obligation to exercise any of the powers vested in it by the
Guarantee at the request of any holder of Capital Securities, unless offered
reasonable indemnity against the costs, expenses and liabilities which might
be incurred thereby.
 
  The Company and certain of its affiliates maintain a banking relationship
with the Guarantee Trustee and its affiliates.
 
GOVERNING LAW
 
  The Guarantee is governed by and construed in accordance with the laws of
the State of New York, without regard to conflict of laws principles.
 
                                      51
<PAGE>
 
                DESCRIPTION OF THE SUBORDINATED DEBT SECURITIES
 
  Set forth below is a description of the principal terms of the Subordinated
Debt Securities. The following description does not purport to be complete and
is subject to, and is qualified in its entirety by reference to, the
description in the Indenture, dated as of February 4, 1997, as supplemented by
the Supplemental Indenture dated April 22, 1997 (the "Base Indenture"),
between the Company and The Chase Manhattan Bank, as trustee (the "Debt
Trustee"), as supplemented by a First Supplemental Indenture dated as of
February 4, 1997 (the Base Indenture, as so supplemented, is herein referred
to as the "Indenture"). Certain capitalized terms used herein are defined in
the Indenture. The terms of the Indenture are those set forth in the Indenture
and those made part thereof by the Trust Indenture Act. The Indenture, by its
terms, requires the Company and the Indenture Trustee to comply with the Trust
Indenture Act. This summary of the material terms of the Indenture does not
purport to be complete and is subject in all respects to the provisions of,
and is qualified in its entirety by reference to, the Indenture (a copy of
which has been filed as an exhibit to the Registration Statement of which this
Prospectus is a part) and the Trust Indenture Act. The Indenture has been
qualified under the Trust Indenture Act.
 
  In certain circumstances, the Subordinated Debt Securities may be
distributed to the holders of the Trust Securities in liquidation of the
Trust. See "Description of the Capital Securities--Liquidation Distribution
Upon Dissolution."
 
GENERAL
 
  Concurrently with the issuance of the Capital Securities, the Trust invested
the proceeds thereof, together with the consideration paid by the Company for
the Common Securities, in the Old Subordinated Debt Securities issued by the
Company. The Old Subordinated Debt Securities were and the New Subordinated
Debt Securities exchanged for the Old Subordinated Debt Securities will be
issued as unsecured debt under the Indenture. The Subordinated Debt Securities
will be limited to an amount equal to the sum of the aggregate stated
liquidation amounts of the Trust Securities.
 
  The Subordinated Debt Securities are not subject to a sinking fund
provision. The entire principal amount of the Subordinated Debt Securities
will mature and become due and payable, together with any accrued and unpaid
interest thereon, including Compounded Interest (as defined herein), if any,
on February 1, 2027.
 
  If the Subordinated Debt Securities are distributed to holders of the
Capital Securities in liquidation of such holders' interests in the Trust, the
Subordinated Debt Securities will, with respect to the Capital Securities held
in book-entry only form, initially be issued as a Global Security (as defined
herein) having an aggregate principal amount equal to the liquidation amount
of such Capital Securities and, with respect to such Capital Securities held
in certificated non-book entry form, will initially be deemed to be
represented by such certificates and to have an aggregate principal amount
equal to the liquidation amount of such Capital Securities. As described
herein, under certain limited circumstances, Subordinated Debt Securities may
be issued in certificated non-book entry form in exchange for a Global
Security. See "--Book-Entry Issuance and Settlement" below. The Subordinated
Debt Securities deemed to be represented by a Capital Security certificate
will be issued in certificated form upon presentation for transfer or
reissuance. Payments on the Subordinated Debt Securities issued as a Global
Security will be made to DTC, a successor depositary or, in the event that no
depositary is used, to a paying agent for the Subordinated Debt Securities. In
the event the Subordinated Debt Securities are issued in certificated non-book
entry form, interest and principal will be payable, the transfer of the
Subordinated Debt Securities will be registrable and the Subordinated Debt
Securities will be exchangeable for the Subordinated Debt Securities of other
denominations of a like aggregate principal amount at the corporate trust
office of the Debt Trustee in New York, New York; provided that payment of
interest may be made, at the option of the Company, by check mailed to the
address of the holder entitled thereto or by wire transfer to an account
appropriately designated by the holder entitled thereto. Notwithstanding the
foregoing, so long as the holder of any Subordinated Debt Securities is the
Institutional Trustee, the payment of interest and principal on the
Subordinated Debt Securities held by the Institutional Trustee will be made at
such place and to such account as may be designated by the Institutional
Trustee.
 
                                      52
<PAGE>
 
  The Indenture does not contain provisions that afford holders of the
Subordinated Debt Securities protection in the event of a highly leveraged
transaction or other similar transaction involving the Company that may
adversely affect such holders.
 
SUBORDINATION
 
  The Indenture provides that the Subordinated Debt Securities are
subordinated and junior in right of payment to all present and future Senior
Indebtedness of the Company. No payment of principal (including redemption
payments) or interest on the Subordinated Debt Securities may be made (in
cash, property, securities, by set-off or otherwise) if (i) any Senior
Indebtedness of the Company, as the case may be, is not paid when due and any
applicable grace period with respect to a payment default under such Senior
Indebtedness has ended and such default has not been cured or waived or ceased
to exist or (ii) the maturity of any Senior Indebtedness of the Company has
been accelerated because of a default. Upon any distribution of assets of the
Company to creditors upon any dissolution, winding-up, liquidation or
reorganization, whether voluntary or involuntary, or in bankruptcy,
insolvency, receivership or other proceedings, all principal and interest due
or to become due on all Senior Indebtedness of the Company must be paid in
full before the holders of the Subordinated Debt Securities are entitled to
receive or retain any payment. Upon satisfaction of all claims of all Senior
Indebtedness then outstanding, the rights of the holders of the Subordinated
Debt Securities will be subrogated to the rights of the holders of Senior
Indebtedness of the Company to receive payments or distributions applicable to
Senior Indebtedness until all amounts owing on the Subordinated Debt
Securities are paid in full.
 
  The term "Senior Indebtedness" means, with respect to the Company (except
any other obligations which rank pari passu with the Subordinated Debt
Securities) (i) the principal and interest in respect of (A) indebtedness of
the Company for money borrowed, and (B) indebtedness evidenced by securities,
debentures, notes, bonds or other similar instruments issued by the Company,
including, without limitation, any current or future indebtedness under any
indenture (other than the Indenture) to which the Company is party; (ii) all
capital lease obligations of the Company, (iii) all obligations of the Company
issued or assumed as the deferred purchase price of property, all conditional
sale obligations of the Company and all obligations of the Company under any
title retention agreement (but excluding trade accounts payable arising in the
ordinary course of business), (iv) all obligations of the Company for the
reimbursement on any letter of credit, any banker's acceptance, any security
purchase facility, any repurchase agreement or similar arrangement, any
interest rate swap, any other hedging arrangement, any obligation under
options or any similar credit or other transaction, (v) all obligations of the
type referred to in clauses (i) through (iv) above of other persons for the
payment of which the Company is responsible or liable as obligor, guarantor or
otherwise and (vi) all obligations of the type referred to in clauses (i)
through (v) above of other persons secured by any lien on any property or
asset of the Company (whether or not such obligation is assumed by the
Company), except for (1) any indebtedness between or among the Company or any
affiliate of the Company and (2) any other debt securities issued pursuant to
the Indenture and guarantees in respect of those debt securities. Senior
Indebtedness does not include the Subordinated Debt Securities or any junior
subordinated debt securities issued in the future with subordination terms
substantially similar to the Subordinated Debt Securities. Senior Indebtedness
shall continue to be Senior Indebtedness and be entitled to the benefits of
the subordination provisions irrespective of any amendment, modification or
waiver of any term of such Senior Indebtedness.
 
  Because the Company is a bank holding company, the right of the Company to
participate in any distribution of assets of any subsidiary upon such
subsidiary's liquidation or reorganization or otherwise is subject to the
prior claims of creditors of that subsidiary, except to the extent the Company
may itself be recognized as a creditor of that subsidiary. The Company is a
legal entity separate and distinct from its Banking Subsidiaries and non-
banking subsidiaries. The Company's principal assets are the stock of its
Banking Subsidiaries and non-banking subsidiaries. The Company relies
primarily on dividends from such subsidiaries to meet its obligations for
payment of principal and interest on its outstanding debt obligations and
corporate expenses. The principal sources of the Company's income are
dividends, interest and fees from the Banking Subsidiaries and non-banking
subsidiaries. The Banking Subsidiaries of the Company are subject to certain
 
                                      53
<PAGE>
 
restrictions imposed by federal and state law on any extensions of credit to,
and certain other transactions with the Company and certain other affiliates
and on investments in stock or other securities thereof. In addition, payment
of dividends to the Company by the Banking Subsidiaries is subject to ongoing
review by banking regulators and is subject to various statutory limitations
and in certain circumstances requires approval by banking regulatory
authorities. Accordingly, the Company's obligations under the Subordinated Debt
Securities will be effectively subordinated to all existing and future
liabilities of the Company's subsidiaries, and claimants should look only to
the assets of the Company for payments thereunder.
   
  The Indenture does not limit the aggregate amount of Senior Indebtedness that
may be issued by the Company. The Company had approximately $227.0 million of
Senior Indebtedness as of March 31, 1997.     
 
REDEMPTION
 
  The Company may redeem the Subordinated Debt Securities, in whole or in part,
at any time and from time to time, on or after February 1, 2007 upon not less
than 30 nor more than 60 days' notice, at par plus accrued and unpaid interest
to the redemption date. In addition, the Subordinated Debt Securities may be
redeemed by the Company at any time, in whole or in part, in certain
circumstances described herein upon the occurrence and continuation of a Tax
Event or a Capital Treatment Event, within 90 days following the occurrence of
such Tax Event or Capital Treatment Event, upon not less than 30 nor more than
60 days' notice, at par, plus any accrued and unpaid interest to the redemption
date. In each case, redemption prior to maturity is subject to the receipt by
the Company of prior approval from the Federal Reserve, if then required under
applicable capital guidelines or policies of the Federal Reserve. See
"Description of the Capital Securities--Redemption."
 
INTEREST
 
  The Subordinated Debt Securities shall bear interest at a variable annual
rate equal to LIBOR plus 0.85%, from the original date of issuance of the Old
Subordinated Debt Securities, payable quarterly in arrears on the first day of
February, May, August and November of each year (each an "Interest Payment
Date"), commencing May 1, 1997, to the person in whose name such Subordinated
Debt Security is registered, subject to certain exceptions, at the close of
business on the Business Day next preceding such Interest Payment Date. The
term "interest" as used herein, as such term relates to the Subordinated Debt
Securities, includes any Compounded Interest or Additional Interest payable
unless otherwise stated. In the event the Subordinated Debt Securities are not
held solely in book-entry only form, the Company will select relevant record
dates, which shall be 15 days prior to the relevant Interest Payment Date.
 
  The Chase Manhattan Bank, as Calculation Agent (the "Calculation Agent"),
will calculate the interest rate for each quarterly interest period based on
LIBOR determined as of two London Business Days (defined as any day, other than
a Saturday or Sunday, on which banks are open for business in London) prior to
the first day of such interest period (each, a "Determination Date"). "LIBOR"
means, with respect to a quarterly interest period relating to an Interest
Payment Date (in the following order of priority):
 
    (i) the rate (expressed as a percentage per annum) for Eurodollar
  deposits having a three-month maturity that appears on Telerate Page 3750
  as of 11:00 a.m. (London time) on the related Determination Date;
 
    (ii) if such rate does not appear on Telerate Page 3750 as of 11:00 a.m.
  (London time) on the related Determination Date, LIBOR will be the
  arithmetic mean (if necessary rounded upwards to the nearest whole multiple
  of .00001%) of the rates (expressed as percentages per annum) for
  Eurodollar deposits having a three-month maturity that appear on Reuters
  Monitor Money Rates Page LIBO ("Reuters Page LIBO") as of 11:00 a.m.
  (London time) on such Determination Date;
 
    (iii) if such rate does not appear on Reuters Page LIBO as of 11:00 a.m.
  (London time) on the related Determination Date, the Calculation Agent will
  request the principal London offices of four leading banks in the London
  interbank market to provide such banks' offered quotations (expressed as
  percentages per annum) to prime banks in the London interbank market for
  Eurodollar deposits having a three-month
 
                                       54
<PAGE>
 
  maturity as of 11:00 a.m. (London time) on such Determination Date. If at
  least two quotations are provided, LIBOR will be the arithmetic mean (if
  necessary rounded upwards to the nearest whole multiple of .00001%) of such
  quotations;
 
    (iv) if fewer than two such quotations are provided as requested in
  clause (iii) above, the Calculation Agent will request four major New York
  City banks to provide such banks' offered quotations (expressed as
  percentages per annum) to leading European banks for loans in Eurodollars
  as of 11:00 a.m. (London time) on such Determination Date. If at least two
  such quotations are provided, LIBOR will be the arithmetic mean (if
  necessary rounded upwards to the nearest whole multiple of .00001%) of such
  quotations; and
 
    (v) if fewer than two such quotations are provided as requested in clause
  (iv) above, LIBOR will be LIBOR determined with respect to the interest
  period immediately preceding such current interest period.
 
  If the rate for Eurodollar deposits having a three-month maturity that
initially appears on Telerate Page 3750 or Reuters Page LIBO, as the case may
be, as of 11:00 a.m. (London time) on the related Determination Date is
superseded on Telerate Page 3750 or Reuters Page LIBO, as the case may be, by
a corrected rate before 12:00 noon (London time) on such Determination Date,
the corrected rate as so substituted on the applicable page will be the
applicable LIBOR for such Determination Date.
 
  LIBOR for the initial interest period (commencing upon the original issuance
of the Subordinated Debt Securities) is 5.5625% and the interest rate for the
initial interest period is 6.4125%.
 
  Absent manifest error, the Calculation Agent's determination of LIBOR and
its calculation of the applicable interest rate for each interest period will
be final and binding. Investors may obtain the interest rates for the current
and preceding interest period by writing or calling Corporate Trust
Administration at the Calculation Agent at The Chase Manhattan Bank, 450 West
33rd Street, New York, New York 10001.
 
  The amount of interest payable for any period will be computed on the basis
of the actual number of days elapsed in a year of twelve 30-day months. In the
event that any date on which interest is payable on the Subordinated Debt
Securities is not a Business Day, then payment of the interest payable on such
date will be made on the next succeeding day that is a Business Day (and
without any interest or other payment in respect of any such delay) with the
same force and effect as if made on such date.
 
OPTION TO EXTEND INTEREST PAYMENT PERIOD
 
  So long as the Company is not in default in the payment of interest that has
become due and payable on the Subordinated Debt Securities and no accrued
interest from a prior completed Extension Period is unpaid, the Company shall
have the right to defer payments of interest on the Subordinated Debt
Securities by extending the interest payment period, at any time and from time
to time, for Extension Periods, each not exceeding 20 consecutive quarterly
periods and none extending beyond the maturity date of the Subordinated Debt
Securities, provided, however, that on the date on which each such Extension
Period ends or, if such date is not an Interest Payment Date, on the
immediately following Interest Payment Date, the Company shall pay all
interest then accrued and unpaid, together with interest thereon at a variable
annual rate equal to LIBOR plus 0.85%, compounded quarterly to the extent
permitted by applicable law ("Compounded Interest"). During any Extension
Period (a) the Company shall not declare or pay dividends on, make any
distribution with respect to, or redeem, purchase, acquire, or make a
liquidation payment with respect to, any of its capital stock or rights to
acquire such capital stock (other than (i) purchases or acquisitions of shares
of any such capital stock or rights to acquire such capital stock in
connection with the satisfaction by the Company of its obligations under any
employee benefit plans, (ii) as a result of a reclassification of the
Company's capital stock or rights to acquire such capital stock or the
exchange or conversion of one class or series of the Company's capital stock
or rights to acquire such capital stock for another class or series of the
Company's capital stock or rights to acquire such capital stock, (iii) the
purchase of fractional interests in shares of the Company's capital stock
pursuant to the conversion or exchange provisions of such capital stock or the
security being converted or exchanged, (iv)
 
                                      55
<PAGE>
 
dividends and distributions made on the Company's capital stock or rights to
acquire such capital stock with the Company's capital stock or rights to
acquire such capital stock, or (v) any declaration of a dividend in connection
with the implementation of a shareholder rights plan, or the issuance of stock
under any such plan in the future, or the redemption or repurchase of any such
rights pursuant thereto), or make any guarantee payments (other than payments
under the Guarantee and the Common Securities Guarantee) with respect to the
foregoing and (b) the Company shall not make any payment of interest,
principal or premium, if any, on or repay, repurchase or redeem any debt
securities issued by the Company that rank pari passu with or junior to the
Subordinated Debt Securities. Prior to the termination of any such Extension
Period, the Company may further defer payments of interest by extending the
interest payment period; provided, however, that each such Extension Period,
including all such previous and further extensions thereof, may not exceed 20
consecutive quarterly periods or extend beyond the maturity of the
Subordinated Debt Securities. Upon the termination of any Extension Period and
the payment of all amounts then due, the Company may commence a new Extension
Period, subject to the terms set forth herein. No interest during an Extension
Period, except on the date on which such Extension Period terminates (or if
such date is not an Interest Payment Date, on the immediately following
Interest Payment Date), shall be due and payable. The Company has no present
intention of exercising its right to defer payments of interest on the
Subordinated Debt Securities.
 
  If the Institutional Trustee shall be the sole holder of the Subordinated
Debt Securities, the Company shall give the Administrators, the Institutional
Trustee and the Indenture Trustee notice of its initiation of any Extension
Period one Business Day prior to the earlier of (i) the date Distributions on
the Capital Securities are payable or (ii) the date the Administrators are
required to give notice to holders of the Capital Securities (or any national
securities exchange or other organization on which the Capital Securities are
listed, if any) of the record date or the distribution payment date, in each
case with respect to Distributions on the Trust Securities the payment of
which is being deferred. An Administrator shall give notice of the Company's
initiation of any Extension Period to the holders of such Capital Securities.
If the Institutional Trustee shall not be the sole holder of the Subordinated
Debt Securities, the Company shall give the holders of such Subordinated Debt
Securities notice of its initiation of such Extension Period ten Business Days
prior to the earlier of (i) the next succeeding Interest Payment Date or (ii)
the date upon which the Company is required to give notice to holders of such
Subordinated Debt Securities (or any national securities exchange or other
organization on which the corresponding Capital Securities are listed, if any)
of the record date or interest payment date, in each case with respect to
interest payments the payment of which is being deferred.
 
ADDITIONAL INTEREST
 
  If at any time the Trust shall be required to pay any taxes, duties,
assessments or governmental charges of whatever nature (other than withholding
taxes) imposed by the United States, or any other taxing authority, then, in
any such case, the Company will pay as additional interest ("Additional
Interest") on the Subordinated Debt Securities such additional amounts as
shall be required so that the net amounts received and retained by the Trust
after paying any such taxes, duties, assessments or other governmental charges
will equal the amounts the Trust and the Institutional Trustee would have
received had no such taxes, duties, assessments or other governmental charges
been imposed.
 
PROPOSED TAX LEGISLATION
 
  On February 6, 1997, President Clinton proposed the Proposed Legislation
that would, among other things, generally deny corporate issuers a deduction
for interest in respect of certain debt obligations if such debt obligations
have a maximum term in excess of 15 years and are not shown as indebtedness on
the issuer's applicable consolidated balance sheet. As currently proposed, the
Proposed Legislation would be effective generally for instruments issued on or
after the date of first Congressional committee action. Under current law, the
Company will be able to deduct interest on the Subordinated Debt Securities
and, based upon the effective date of the Proposed Legislation as it is
currently proposed, it is expected that if the Proposed Legislation were
enacted, such legislation would not apply retroactively to the Subordinated
Debt Securities. However, if the
 
                                      56
<PAGE>
 
Proposed Legislation is enacted with retroactive effect with respect to the
Subordinated Debt Securities, the Company would not be entitled to an interest
deduction with respect to the Subordinated Debt Securities. There can be no
assurance that the Proposed Legislation, if enacted, will not apply
retroactively to the Subordinated Debt Securities or that other legislation
enacted after the date hereof will not otherwise adversely affect the ability
of the Company to deduct the interest payable on the Subordinated Debt
Securities. Accordingly, there can be no assurance that a Tax Event will not
occur. See "Description of the Capital Securities Redemption."
 
CERTAIN COVENANTS
 
  If (i) there shall have occurred and be continuing any event that would
constitute an Event of Default (as defined herein) under the Indenture, (ii)
the Company shall be in default with respect to its payment of any obligations
under the Guarantee or the Common Securities Guarantee, or (iii) the Company
shall have given notice of its election to defer payments of interest on the
Subordinated Debt Securities by extending the interest payment period as
provided in the Indenture and such period, or any extension thereof, shall be
continuing, then (a) the Company shall not declare or pay any dividend on,
make a distribution with respect to, or redeem, purchase or make a liquidation
payment with respect to, any of its capital stock or rights to acquire such
capital stock (other than (i) purchases or acquisitions of shares of any such
capital stock or rights to acquire such capital stock in connection with the
satisfaction by the Company of its obligations under any employee benefit
plans, (ii) as a result of a reclassification of the Company's capital stock
or rights to acquire such capital stock or the exchange or conversion of one
class or series of the Company's capital stock or rights to acquire such
capital stock for another class or series of the Company's capital stock or
rights to acquire such capital stock, (iii) the purchase of fractional
interests in shares of the Company's capital stock pursuant to the conversion
or exchange provisions of such capital stock or the security being converted
or exchanged, (iv) dividends and distributions made on the Company's capital
stock or rights to acquire such capital stock with the Company's capital stock
or rights to acquire such capital stock, or (v) any declaration of a dividend
in connection with the implementation of a shareholder rights plan, or the
issuance of stock under such plan in the future, or the redemption or
repurchase of any such rights pursuant thereto), or make any guarantee
payments (other than payments under the Guarantee and the Common Securities
Guarantee) with respect to the foregoing and (b) the Company shall not make
any payment of interest, principal or premium, if any, on or repay, repurchase
or redeem any debt securities issued by the Company that rank pari passu with
or junior to the Subordinated Debt Securities.
 
  For so long as the Trust Securities remain outstanding, the Company will
covenant to maintain 100% ownership of the Common Securities; provided,
however, that any permitted successor of the Company under the Indenture may
succeed to the Company's ownership of such Common Securities. The
Administrators and the holder of a majority of the Common Securities each will
covenant to use their respective reasonable efforts to cause the Trust (a) to
remain a statutory business trust, except in connection with the distribution
of the Subordinated Debt Securities to the holders of the Trust Securities in
liquidation of the Trust, the redemption of all of the Trust Securities or
certain mergers, consolidations or amalgamations, each as permitted by the
Declaration, and (b) to otherwise continue to be classified as a grantor trust
for United States federal income tax purposes and (c) to use its reasonable
efforts to cause each holder of the Trust Securities to be treated as owning
an undivided beneficial interest in the Subordinated Debt Securities.
 
LIMITATION ON MERGERS AND SALES OF ASSETS
 
  Nothing contained in the Indenture or in the Subordinated Debt Securities
shall prevent any consolidation or merger of the Company with or into any
other corporation (whether or not affiliated with the Company) or successive
consolidations or mergers in which the Company or its successor or successors
shall be a party, or shall prevent any sale, conveyance, transfer or other
disposition of the property of the Company or its successor or successors as
an entirety, or substantially as an entirety, to any other corporation
(whether or not affiliated with the Company or its successor or successors)
authorized to acquire and operate the same; provided, however, that the
Company shall, upon any such consolidation, merger, sale, conveyance, transfer
or other disposition, cause the obligations of the Company under the
Subordinated Debt Securities and under the Indenture to be
 
                                      57
<PAGE>
 
expressly assumed, by supplemental indenture satisfactory in form to the
Indenture Trustee and executed and delivered to the Indenture Trustee, by the
successor entity formed by such consolidation or into which the Company shall
have been merged, or which shall have acquired such property. Upon execution
and delivery of such supplemental indenture to the Indenture Trustee, such
successor entity will be substituted under the Indenture and thereupon the
Company will be relieved of any further liability or obligation thereunder.
 
EVENTS OF DEFAULT, WAIVER AND NOTICE
 
  The Indenture provides that any one or more of the following described
events which has occurred and is continuing with respect to the Subordinated
Debt Securities constitutes an Indenture Event of Default with respect to the
Subordinated Debt Securities:
 
    (a) default for 30 days in payment of any interest on the Subordinated
  Debt Securities, including any Compounded Interest or Additional Interest
  in respect thereof, when due; provided, however, that a valid extension of
  the interest payment period by the Company shall not constitute a default
  in the payment of interest for this purpose; or
 
    (b) default in payment of principal on the Subordinated Debt Securities
  when due either at maturity, upon redemption, by declaration or otherwise;
  provided, however, that a valid extension of the maturity of such
  Subordinated Debt Securities shall not constitute a default for this
  purpose; or
 
    (c) default resulting in acceleration of other indebtedness of the
  Company for borrowed money where the aggregate principal amount so
  accelerated exceeds $25 million and such acceleration is not rescinded or
  annulled within 30 days after the written notice thereof to the Company by
  the Indenture Trustee or to the Company and the Indenture Trustee by the
  holders of 25% in aggregate principal amount of the Subordinated Debt
  Securities then outstanding; or
 
    (d) default by the Company in the performance of any other of the
  covenants or agreements in the Indenture which shall not have been remedied
  for a period of 90 days after notice to the Company by the Indenture
  Trustee or to the Company and the Indenture Trustee by the holders of not
  less than 25% in aggregate principal amount of Subordinated Debt
  Securities; or
 
    (e) certain events of bankruptcy, insolvency or reorganization of the
  Company; or
 
    (f) the Liquidation of the Trust, except in connection with the
  distribution of the Subordinated Debt Securities to the holders of the
  Trust Securities in liquidation of the Trust, the redemption of all of the
  Trust Securities, or certain mergers, consolidations or amalgamations, each
  as permitted by the Declaration.
 
  The Indenture provides that the Indenture Trustee may, under certain
circumstances, withhold from the holders notice of default with respect to the
Subordinated Debt Securities (except for any default in payment of principal
of or interest or premium, if any, on the Subordinated Debt Securities) if the
Trustee considers it in the interest of such holders to do so.
 
  The Indenture provides that if an Indenture Event of Default in respect of
the Subordinated Debt Securities shall have occurred and be continuing, either
the Indenture Trustee or the holders of not less than 25% in aggregate
principal amount of the Subordinated Debt Securities then outstanding may
declare the principal of and accrued interest on all Subordinated Debt
Securities to be due and payable immediately, but upon certain conditions such
declarations may be annulled and past defaults may be waived (except defaults
in payment of principal of or interest or premium on the Subordinated Debt
Securities, which must be cured or paid in full) by the holders of a majority
in aggregate principal amount of the Subordinated Debt Securities then
outstanding.
 
  No holder of any Subordinated Debt Security shall have any right to
institute any suit, action or proceeding for any remedy under the Indenture,
unless such holder previously shall have given to the Indenture Trustee
written notice of a continuing Event of Default with respect to the
Subordinated Debt Securities and unless the holders of not less than 25% in
aggregate principal amount of the Subordinated Debt Securities then
outstanding shall have given the Indenture Trustee a written request to
institute such action, suit or proceeding and shall have offered to the
Indenture Trustee such reasonable indemnity as it may require against the
costs, expenses
 
                                      58
<PAGE>
 
and liabilities to be incurred thereby, and the Indenture Trustee for 60 days
after its receipt of such notice, request and offer of indemnity shall have
failed to institute any such action, suit or proceeding; provided that no
holder of the Subordinated Debt Securities shall have any right to prejudice
the rights of any other holder of the Subordinated Debt Securities, obtain
priority or preference over any other such holder or enforce any right under
the Indenture except as provided in the Indenture and for the equal, ratable
and common benefit of all holders of the Subordinated Debt Securities.
Notwithstanding the foregoing, the right of any holder of any Subordinated
Debt Security to receive payment of the principal of, premium, if any, and
interest, on such Subordinated Debt Security when due, or to institute suit
for the enforcement of any such payment, shall not be impaired or affected
without the consent of such holder.
 
  The holders of a majority in aggregate principal amount of the Subordinated
Debt Securities then outstanding shall have the right to direct the time,
method and place of conducting any proceeding for any remedy available to, or
exercising any trust or power conferred on, the Indenture Trustee under the
Indenture; provided, however, that, except under certain circumstances, the
Indenture Trustee may decline to follow any such direction if the Indenture
Trustee determines that the action so directed would be unjustly prejudicial
to holders not taking part in such direction or would be unlawful or would
involve the Indenture Trustee in personal liability. The Indenture requires
the annual filing by the Company with the Indenture Trustee of a certificate
as to the absence of certain defaults under the Indenture.
 
  An Indenture Event of Default under the Indenture also constitutes a
Declaration Event of Default. The holders of the Capital Securities, in
certain circumstances, have the right to direct the Institutional Trustee to
exercise its rights as the holder of the Subordinated Debt Securities. See
"Description of the Capital Securities--Declaration Events of Default" and
"Voting Rights." Notwithstanding the foregoing, if an Indenture Event of
Default has occurred and is continuing and such event is attributable to the
failure of the Company to pay interest or principal (or premium, if any) on
the Subordinated Debt Securities on the respective dates such interest or
principal (or premium, if any) is payable (or in the case of redemption, on
the redemption date), the Company acknowledges that a holder of record of the
Capital Securities may institute a Direct Action for payment, on or after the
respective due dates specified in such Subordinated Debt Securities, to such
holder directly of the principal of (or premium, if any) or interest on the
Subordinated Debt Securities having an aggregate principal amount equal to the
aggregate liquidation amount of the Capital Securities of such holder.
Notwithstanding any payments made to such holder of the Capital Securities by
the Company in connection with a Direct Action, the Company shall remain
obligated to pay the principal of (or premium, if any) or interest on the
Subordinated Debt Securities, and the Company shall be subrogated to the
rights of such holder of such Capital Securities under the Declaration to the
extent of any payments made by the Company to such holder in any Direct
Action; provided, however, that no such subrogation right may be exercised so
long as a Declaration Event of Default has occurred and is continuing. Except
to the extent described above under "Description of the Capital Securities--
Declaration Events of Default" and "Voting Rights," the holders of the Capital
Securities will not be able to exercise directly any other remedy available to
the holders of the Subordinated Debt Securities.
 
MODIFICATION OF THE INDENTURE
 
  The Indenture contains provisions permitting the Company and the Indenture
Trustee, with the consent of the holders of not less than a majority in
principal amount of the Subordinated Debt Securities at the time outstanding,
to modify the Indenture or any supplemental indenture or the rights of the
holders of the Subordinated Debt Securities; provided, however, that no such
modification shall without the consent of the holder of each Subordinated Debt
Security so affected (i) extend the fixed maturity of any Subordinated Debt
Security, or reduce the principal amount thereof or any redemption premium
thereon, or reduce the rate or extend the time of payment of interest thereon,
or make the principal of or interest on, the Subordinated Debt Securities
payable in any coin or currency other than that provided in the Subordinated
Debt Securities, or impair or affect the right of any holder of the
Subordinated Debt Securities to institute suit for the payment thereof or (ii)
reduce the aforesaid percentage of Subordinated Debt Securities the consent of
the holders of which is required for any such modification.
 
 
                                      59
<PAGE>
 
  The Company and the Indenture Trustee may enter into supplemental
indentures, without the consent of any holder of the Subordinated Debt
Securities: (i) to evidence the succession of another corporation to the
Company and the assumption by the successor corporation of the covenants,
agreements and obligations of the Company pursuant to the Indenture; (ii) to
add to the covenants of the Company such further covenants, restrictions or
conditions for the protection of the holders of the Subordinated Debt
Securities and to make the occurrence, or the occurrence and continuance
(including any or no grace periods), of a default in any of such additional
covenants, restrictions or conditions a default or an Event of Default
permitting the enforcement of remedies provided in the Indenture; (iii) to
cure any ambiguity or to correct or supplement any provision contained in the
Indenture or in any supplemental indenture which may be defective or
inconsistent with any other provision contained therein or in any supplemental
indenture, or to make such other provisions in regard to matters or questions
arising under the Indenture; provided that any such action shall not adversely
affect the interests of the holders of the Subordinated Debt Securities; (iv)
to add to, delete from, or revise the terms of the Subordinated Debt
Securities to provide for transfer procedures and restrictions substantially
similar to those applicable to the Capital Securities (for purposes of
assuring that no registration of the Subordinated Debt Securities is required
under the Securities Act); (v) to evidence and provide for the acceptance of
appointment under the Indenture by a successor Indenture Trustee with respect
to the Subordinated Debt Securities and to add to or change any of the
provisions of the Indenture as shall be necessary to provide for or facilitate
the administration of the Trust under the Indenture by more than one Debt
Trustee, pursuant to the Indenture; (vi) to make any change that does not
adversely affect the rights of any holder of any Subordinated Debt Security in
any material respect; or (vii) to provide for the issuance, and establish the
form and terms and conditions, of the Subordinated Debt Securities, to
establish the form of any certifications required to be furnished pursuant to
the terms of the Indenture or the Subordinated Debt Securities or to add to
the rights of the holders of the Subordinated Debt Securities.
 
DISCHARGE
 
  The Indenture provides that when, among other things, all Subordinated Debt
Securities not previously delivered to the Indenture Trustee for cancellation
(i) have become due and payable or (ii) will become due and payable at the
stated maturity within one year or are to be called for redemption within one
year under arrangements satisfactory to the Indenture Trustee, and the Company
deposits or causes to be deposited with the Indenture Trustee funds, in trust,
for the purpose and in an amount sufficient to pay and discharge the entire
indebtedness on the Subordinated Debt Securities not previously delivered to
the Indenture Trustee for cancellation, for the principal and interest to the
date of the stated maturity or redemption date, as the case may be, then the
Indenture will cease to be of further effect (except as to the Company's
obligations to pay all other sums due pursuant to the Indenture and to provide
the officers' certificates and opinions of counsel described therein), and the
Company will be deemed to have satisfied and discharged the Indenture.
 
THE INDENTURE TRUSTEE
 
  The Company and certain of its affiliates maintain a banking relationship
with the Indenture Trustee and its affiliates.
 
BOOK-ENTRY ISSUANCE AND SETTLEMENT
 
  If distributed to holders of the Capital Securities of the Trust in
connection with the involuntary or voluntary dissolution, winding-up or
liquidation of the Trust, the Subordinated Debt Securities will, with respect
to such Capital Securities held in book-entry form, initially be issued in the
form of one or more global certificates (each a "Global Security") registered
in the name of the Depositary or its nominee. Except under the limited
circumstances described below, the Subordinated Debt Securities represented by
a Global Security will not be exchangeable for, and will not otherwise be
issuable as, the Subordinated Debt Securities in definitive form. The Global
Securities described above may not be transferred except by the Depositary to
a nominee of the Depositary or by a nominee of the Depositary to the
Depositary or another nominee of the Depositary or to a successor depositary
or its nominee.
 
                                      60
<PAGE>
 
  The laws of some jurisdictions require that certain purchasers of securities
take physical delivery of such securities in definitive form. Such laws may
impair the ability to transfer beneficial interests in such a Global Security.
 
  Except as provided below, owners of beneficial interests in a Global
Security will not be entitled to receive physical delivery of Subordinated
Debt Securities in definitive form and will not be considered the holders (as
defined in the Indenture) thereof for any purpose under the Indenture, and no
Global Security representing the Subordinated Debt Securities shall be
exchangeable, except for another Global Security of like denomination and
tenor to be registered in the name of the Depositary or its nominee or to a
successor Depositary or its nominee. Accordingly, each beneficial owner must
rely on the procedures of the Depositary or if such person is not a
Participant, on the procedures of the Participant through which such person
owns its interest to exercise any rights of a holder under the Indenture.
 
THE DEPOSITARY
 
  If the Subordinated Debt Securities are distributed to holders of the
Capital Securities in liquidation of such holders' interests in the Trust, DTC
will act as securities Depositary for the Subordinated Debt Securities
distributed by the Trust with respect to the Capital Securities held in book-
entry form. For a description of DTC and the specific terms of the depositary
arrangements, see "Description of the Capital Securities--Book-Entry Only
Issuance--The Depository Trust Company." As of the date of this Prospectus,
the description herein of DTC's book-entry system and DTC's practices as they
relate to purchases, transfers, notices and payments with respect to the
Capital Securities would apply in all material respects to any debt
obligations represented by one or more Global Securities held by DTC. The
Company may appoint a successor to DTC or any successor depositary in the
event DTC or such successor depositary is unable or unwilling to continue as
the Depositary for the Global Securities.
 
  None of the Company, the Trust, the Institutional Trustee, the Indenture
Trustee, any paying agent and any other agent of the Company, the Trust, the
Institutional Trustee or the Indenture Trustee will have any responsibility or
liability for any aspect of the records relating to or payments made on
account of beneficial ownership interests in a Global Security for the
Subordinated Debt Securities or for maintaining, supervising or reviewing any
records relating to such beneficial ownership interests.
 
DISCONTINUANCE OF THE DEPOSITARY'S SERVICES
 
  A Global Security shall be exchangeable for the Subordinated Debt Securities
registered in the names of persons other than the Depositary or its nominee
only if (i) the Depositary notifies the Company that it is unwilling or unable
to continue as a depositary for such Global Security and no successor
depositary shall have been appointed, (ii) the Depositary, at any time, ceases
to be a clearing agency registered under the Exchange Act at which time the
Depositary is required to be so registered to act as such depositary and no
successor depositary shall have been appointed, (iii) the Company, in its sole
discretion, determines that such Global Security shall be so exchangeable or
(iv) there shall have occurred an Indenture Event of Default. Any Global
Security that is exchangeable pursuant to the preceding sentence shall be
exchangeable for the Subordinated Debt Securities registered in such names as
the Depositary shall direct. It is expected that such instructions will be
based upon directions received by the Depositary from its Participants with
respect to ownership of beneficial interests in such Global Security.
 
RESTRICTIONS ON TRANSFER
 
  The Subordinated Debt Securities will be issued and may be transferred only
in blocks having an aggregate principal amount of not less that $100,000 (and
integral multiples of $1,000 in excess thereof). Any such transfer of the
Subordinated Debt Securities in a block having an aggregate principal amount
of less than $100,000 shall be deemed to be void and of no legal effect
whatsoever. Any such transferee shall be deemed not to be the holder of such
Subordinated Debt Securities for any purpose, including but not limited to the
receipt of payments on
 
                                      61
<PAGE>
 
such Subordinated Debt Securities, and such transferee shall be deemed to have
no interest whatsoever in such Subordinated Debt Securities.
 
GOVERNING LAW
 
  The Indenture and the Subordinated Debt Securities are governed by, and
construed in accordance with, the laws of the State of New York, without
regard to conflict of laws principles.
 
MISCELLANEOUS
 
  The Indenture provides that the Company will pay all fees and expenses
related to (i) the organization, maintenance and dissolution of the Trust,
(ii) the retention of the Institutional Trustee and Administrators and (iii)
the enforcement by the Institutional Trustee of the rights of the holders of
the Capital Securities.
 
  The Company will have the right at all times to assign any of its respective
rights or obligations under the Indenture to a direct or indirect wholly owned
subsidiary of the Company; provided that, in the event of any such assignment,
the Company will remain liable for all of its obligations. Subject to the
foregoing, the Indenture will be binding upon and inure to the benefit of the
parties thereto and their respective successors and assigns. Except as
otherwise provided in "Limitation on Mergers and Sales of Assets," the
Indenture provides that it may not be assigned by the parties thereto.
 
                                      62
<PAGE>
 
         EFFECT OF OBLIGATIONS UNDER THE SUBORDINATED DEBT SECURITIES
                               AND THE GUARANTEE
 
  As set forth in the Declaration, the sole purpose of the Trust is to issue
and sell the Trust Securities evidencing undivided beneficial interests in the
assets of the Trust, and to invest the proceeds from such issuance and sale in
the Subordinated Debt Securities issued by the Company in accordance with such
Trust Securities.
 
  As long as payments of interest and other payments are made when due on the
Subordinated Debt Securities, such payments will be sufficient to cover
distributions and payments due on the Trust Securities because of the
following factors: (i) the aggregate principal amount of the Subordinated Debt
Securities equal to the aggregate stated liquidation amount of the Trust
Securities; (ii) the interest rate and the interest and other payment dates on
the Subordinated Debt Securities match the distribution rate and distribution
and other payment dates for the Trust Securities; (iii) the Company shall pay
all, and the Trust shall not be obligated to pay directly or indirectly any,
costs, expenses, debts, and other obligations of the Trust (other than with
respect to such Trust Securities); and (iv) the Declaration further provides
that the Institutional Trustee shall not take any action or cause or permit
the Trust to, among other things, engage in any activity that is not
consistent with the purposes of the Trust.
 
  Payments of Distributions (to the extent funds therefor are available to the
Trust) and other payments due on the Capital Securities (to the extent funds
therefor are available to the Trust) are guaranteed by the Company as
described under "Description of the Guarantee." If the Company does not make
interest payments on the Subordinated Debt Securities, it is expected that the
Trust will not have sufficient funds to pay Distributions on such Capital
Securities. The Guarantee will not apply to any payment of Distributions
except to the extent that the Trust has funds available for the payment of
such distributions. The Guarantee will cover the payment of Distributions and
other payments on such Capital Securities only if and to the extent that the
Company has made payments of interest or principal on the Subordinated Debt
Securities held by the Trust as its sole assets. The Guarantee, when taken
together with the Company's obligations under the Subordinated Debt
Securities, the Declaration and the Indenture, including its obligations to
pay costs, expenses, debts and other obligations of the Trust (other than with
respect to the Trust Securities), provide a full and unconditional guarantee
on a subordinated basis by the Company of amounts when due on such Capital
Securities.
 
  If the Company fails to make interest or other payments on the Subordinated
Debt Securities when due (after giving effect to any Extension Period), the
Declaration provides a mechanism whereby the holders of the Capital
Securities, using the procedures described herein under "Description of the
Capital Securities--Book-Entry Only Issuance--The Depository Trust Company"
and "Voting Rights," may direct the Institutional Trustee, to the fullest
extent permitted by law to enforce its rights under the Subordinated Debt
Securities. If the Institutional Trustee fails to enforce its rights under the
Subordinated Debt Securities after a majority in liquidation amount of the
Capital Securities have so directed the Institutional Trustee, a holder of
record of the Capital Securities may to the fullest extent permitted by law
institute a legal proceeding against the Company to enforce the Institutional
Trustee's rights under the Subordinated Debt Securities without first
instituting any legal proceedings against the Institutional Trustee or any
other person or entity. Notwithstanding the foregoing, if a Declaration Event
of Default has occurred and is continuing and such event is attributable to
the failure of the Company to pay principal or interest on the Subordinated
Debt Securities on the respective dates such principal or interest is payable
(or in the case of redemption, on the redemption date), then a holder of
record of the Capital Securities may institute a Direct Action for payment on
or after the respective due dates specified in the Subordinated Debt
Securities. In connection with such Direct Action, the Company will be
subrogated to the rights of such holder of the Capital Securities under the
Declaration to the extent of any payment made by the Company to such holder of
the Capital Securities in such Direct Action; provided, however, that no such
subrogation right may be exercised so long as a Declaration Event of Default
has occurred and is continuing.
 
  Because the Company is a bank holding company, the Subordinated Debt
Securities and the Guarantee are effectively subordinated to all existing and
future liabilities, including trade payables, of the Company's subsidiaries,
except to the extent that the Company is a creditor of the subsidiaries
recognized as such.
 
                                      63
<PAGE>
 
                             PLAN OF DISTRIBUTION
   
  Each broker-dealer that receives New Capital Securities for its own account
pursuant to the Exchange Offer must acknowledge that it will deliver a
Prospectus in connection with any resale of such New Capital Securities. This
Prospectus, as it may be amended or supplemented from time to time, may be
used by a broker-dealer in connection with resales of New Capital Securities
received in exchange for Old Capital Securities where such New Capital
Securities were acquired as a result of market-making activities or other
trading activities. The Company and the Trust have agreed that, starting on
the date on which the Exchange Offer is consummated and ending on the close of
business one year after such date, they will make this Prospectus, as amended
or supplemented, available to any broker-dealer for use in connection with any
such resale. In addition, until August 26, 1997, all dealers offering
transactions in the New Capital Securities may be required to deliver a
Prospectus.     
 
  The Company and the Trust will not receive any proceeds from any sale of New
Capital Securities by broker-dealers. New Capital Securities received by
broker-dealers for their own account pursuant to the Exchange Offer may be
sold from time to time in one or more transactions in the over-the-counter
market, in negotiated transactions, through the writing of options on the New
Capital Securities or a combination of such methods of resale, at market
prices prevailing at the time of resale, at prices related to such prevailing
market prices or negotiated prices. Any such resale may be made directly to
purchasers or to or through brokers or dealers who may receive compensation in
the form of commissions or concessions from any such broker-dealer and/or the
purchasers of any such New Capital Securities. Any broker-dealer that resells
New Capital Securities that were received by it for its own account pursuant
to the Exchange Offer and any broker or dealer that participates in a
distribution of such New Capital Securities may be deemed to be an
"underwriter" within the meaning of the Securities Act and any profit of any
such resale of New Capital Securities and any commissions or concessions
received by any such persons may be deemed to be underwriting compensation
under the Securities Act. The Letter of Transmittal states that by
acknowledging that it will deliver and by delivering a Prospectus, a broker-
dealer will not be deemed to admit that it is an "underwriter" within the
meaning of the Securities Act.
 
  Each broker-dealer that surrenders Old Capital Securities pursuant to the
Exchange Offer will be deemed to have agreed, by execution of the Letter of
Transmittal, to comply with applicable laws in connection with offers and
sales by way of this Prospectus including, without limitation, the prospectus
delivery requirements of the Securities Act and the applicable requirements of
Rules 10b-5 and 10b-6 under the Exchange Act and to discontinue offers and
sales upon notice from the Company of the happening of any event that requires
the making of changes in the Registration Statement or the Prospectus so that
the statements therein are not misleading and do not omit to state a material
fact required to be stated therein or necessary to make the statements therein
(in the case of the Prospectus, in light of the circumstances under which they
were made) not misleading. The Company has agreed, subject to certain
exceptions, to make any such required change promptly following the occurrence
of any such event.
 
  For a period of one year after the date on which the Exchange Offer is
consummated, the Company and the Trust will promptly send additional copies of
this Prospectus and any amendment or supplement to this Prospectus to any
broker-dealer that requests such documents in the Letter of Transmittal. The
Company and the Trust have agreed to pay all expenses incidental to the
Exchange Offer (including the expenses of one counsel for the holders of the
Old Capital Securities) other than commissions or concessions of any brokers
or dealers and will indemnify the holders of the Old Capital Securities
(including any broker-dealers) against certain liabilities, including
liabilities under the Securities Act.
 
                                      64
<PAGE>
 
                     UNITED STATES FEDERAL INCOME TAXATION
 
GENERAL
 
  In the opinion of Wachtell, Lipton, Rosen & Katz, New York, New York,
special tax counsel to the Company ("Counsel"), the discussion of United
States federal income taxation which follows summarizes the material United
States federal income tax consequences of the purchase, ownership and
disposition of the Capital Securities.
 
  This summary is based on the Internal Revenue Code of 1986, as amended (the
"Code"), Treasury regulations thereunder, and administrative and judicial
interpretations thereof, each as of the date hereof, all of which are subject
to change, possibly on a retroactive basis.
 
  Except as otherwise stated, this summary deals only with the Capital
Securities held as a capital asset by a holder who or which (i) purchased the
Capital Securities upon original issuance (an "Initial Holder") and (ii) is a
US Holder (as defined below). It does not deal with all aspects of United
States federal income taxation, nor with the particular United States federal
income tax (hereafter, "income tax") consequences which may be applicable to
certain classes of US Holders (such as banks, thrift institutions, real estate
investment trusts, regulated investment companies, insurance companies,
brokers and dealers in securities or currencies, other financial institutions,
tax-exempt organizations, persons holding the Capital Securities as a position
in a "straddle," as part of a "synthetic security or hedge," as part of a
"conversion transaction" or as part of any other integrated investment,
persons having a functional currency other than the U.S. Dollar and certain
United States expatriates). Further, this summary does not address (a) the
income tax consequences to shareholders in, or partners or beneficiaries of, a
holder of the Capital Securities, (b) the United States federal alternative
minimum tax consequences of the purchase, ownership or disposition of the
Capital Securities, or (c) any state, local or foreign tax consequences of the
purchase, ownership and disposition of Capital Securities.
 
  A "US Holder" is a holder of the Capital Securities who or which is a
citizen or individual resident (or is treated as a citizen or individual
resident) of the United States for income tax purposes, a corporation or
partnership created or organized (or treated as created or organized for
income tax purposes) in or under the laws of the United States or any
political subdivision thereof, or an estate the income of which is includible
in its gross income for United States federal income tax purposes without
regard to its source, or a trust if (i) a court within the United States is
able to exercise primary supervision over the administration of the trust and
(ii) one or more United States trustees have the authority to control all
substantial decisions of the trust.
 
EXCHANGE OF THE CAPITAL SECURITIES
 
  The exchange of the Old Capital Securities for the New Capital Securities
should not be a taxable event to holders for income tax purposes. The exchange
of the Old Capital Securities for the New Capital Securities pursuant to the
Exchange Offer should not be treated as an "exchange" for federal income tax
purposes because the degree to which the New Capital Securities differ from
the Old Capital Securities is not economically significant and because the
exchange will occur by operation of the terms of the Old Capital Securities.
Accordingly, the New Capital Securities should have the same issue price as
the Old Capital Securities, and a holder should have the same adjusted basis
and holding period in the New Capital Securities as the holder had in the Old
Capital Securities immediately before the exchange. Therefore, the tax
opinions rendered by counsel in connection with the issuance of the Old
Capital Securities, when read in conjunction with the tax opinion rendered in
connection with the Exchange Offer, are equally applicable to this issuance of
the New Capital Securities.
 
US HOLDERS
 
  Characterization of the Trust. In connection with the issuance of the Old
Capital Securities, Counsel has rendered its opinion generally to the effect
that, under then current law and assuming full compliance with the
 
                                      65
<PAGE>
 
terms of the Declaration (and other documents), and based on certain
assumptions and qualifications referenced in the opinion, the Trust will be
characterized for United States federal income tax purposes as a grantor trust
and will not be characterized as an association taxable as a corporation for
such purposes. Accordingly, for income tax purposes, each holder of the
Capital Securities generally is considered the owner of an undivided interest
in the Subordinated Debt Securities owned by the Trust, and each US Holder is
required to include all income or gain recognized for income tax purposes with
respect to its allocable share of the Subordinated Debt Securities on its own
income tax return.
 
  Characterization of the Subordinated Debt Securities. In connection with the
issuance of the Old Subordinated Debt Securities, Counsel has rendered its
opinion generally to the effect that, under then current law and assuming full
compliance with the terms of the Indenture (and other documents), and based on
certain assumptions and qualifications referenced in the opinion, the
Subordinated Debt Securities will be characterized for United States federal
income tax purposes as debt of the Company.
 
  Original Issue Discount. Under the terms of the Subordinated Debt
Securities, the Company has the option to defer payments of interest from time
to time by extending the interest payment period for a period not exceeding 20
consecutive quarterly periods, but not beyond the maturity of the Subordinated
Debt Securities. Recently issued Treasury regulations under Section 1273 of
the Code provide that debt instruments like the Subordinated Debt Securities
will not be considered issued with OID by reason of the Company's option to
defer payments of interest if the likelihood of deferral is "remote."
 
  The Company has concluded, and this discussion assumes, that, as of the date
of this Prospectus, the likelihood of exercise of that option is "remote"
within the meaning of the applicable regulations, in part because exercising
that option would prevent the Company from declaring dividends on its stock
and would prevent the Company from making any payments with respect to debt
securities that rank pari passu with or junior to the Subordinated Debt
Securities. Therefore, the Subordinated Debt Securities should not be treated
as issued with OID by reason of the Company's deferral option. Rather, stated
interest on the Subordinated Debt Securities is generally taxable to a US
Holder, as ordinary income, when paid or accrued in accordance with that
holder's method of accounting for income tax purposes. It should be noted,
however, that these regulations have not yet been addressed in any rulings or
other interpretations by the Service. Accordingly, it is possible that the
Service could take a position contrary to the interpretation described herein.
 
  In the event the Company subsequently exercised its option to defer payments
of interest, the Subordinated Debt Securities would be treated as reissued for
OID purposes and the sum of the remaining interest payments on the
Subordinated Debt Securities would thereafter be treated as OID, which would
accrue, and be includible in a US Holder's taxable income, on an economic
accrual basis (regardless of the US Holder's method of accounting for income
tax purposes) over the remaining term of the Subordinated Debt Securities
(including any period of interest deferral), without regard to the timing of
payments under the Subordinated Debt Securities. (Subsequent distributions of
interest on the Subordinated Debt Securities generally would not be taxable.)
The amount of OID that accrued in any period would generally equal the amount
of interest that accrued on the Subordinated Debt Securities in that period at
the stated interest rate. Consequently, during any period of interest
deferral, US Holders will include OID in gross income in advance of the
receipt of cash, and a US Holder which disposes of a Capital Security prior to
the record date for payment of distributions on the Subordinated Debt
Securities following that period will be subject to income tax on OID accrued
through the date of disposition (and not previously included in income), but
will not receive cash from the Trust with respect to that OID.
 
  If the Company's option to defer payments of interest were not treated as
remote, the Subordinated Debt Securities would be treated as initially issued
with OID in an amount equal to the aggregate stated interest over the term of
the Subordinated Debt Securities. That OID would generally be includible in a
US Holder's taxable income, over the term of the Subordinated Debt Securities,
on an economic accrual basis.
 
 
                                      66
<PAGE>
 
  Characterization of Income. Because the income underlying the Capital
Securities will not be characterized as dividends for income tax purposes,
corporate holders of the Capital Securities will not be entitled to a
dividends-received deduction for any income recognized with respect to the
Capital Securities.
 
  Market Discount and Bond Premium. Holders of the Capital Securities may be
considered to have acquired their undivided interests in the Subordinated Debt
Securities with market discount or acquisition premium (as each phrase is
defined for income tax purposes).
 
  Receipt of Subordinated Debt Securities or Cash Upon Liquidation of the
Trust. Under certain circumstances described herein (see "Description of the
Capital Securities"), the Company has the right to distribute the Subordinated
Debt Securities to holders in exchange for the Capital Securities and in
liquidation of the Trust. Except as discussed below, such a distribution would
not be a taxable event for income tax purposes, and each US Holder would have
an aggregate adjusted basis in its Subordinated Debt Securities for income tax
purposes equal to such holder's aggregate adjusted basis in its Capital
Securities. For income tax purposes, a US Holder's holding period in the
Subordinated Debt Securities received in such a liquidation of the Trust would
include the period during which the Capital Securities were held by the
holder. If, however, the relevant event is a Tax Event which results in the
Trust being treated as an association taxable as a corporation, the
distribution would likely constitute a taxable event to US Holders of the
Capital Securities for income tax purposes.
 
  Under certain circumstances described herein (see "Description of the
Capital Securities"), the Subordinated Debt Securities may be redeemed for
cash and the proceeds of such redemption distributed to holders in redemption
of their Capital Securities. Such a redemption would be taxable for income tax
purposes, and a US Holder would recognize gain or loss as if it had sold the
Capital Securities for cash. See "Sales of Capital Securities" below.
 
  Sales of Capital Securities. A US Holder that sells Capital Securities will
recognize gain or loss equal to the difference between its adjusted basis in
the Capital Securities and the amount realized on the sale of such Capital
Securities. A US Holder's adjusted basis in the Capital Securities generally
will be its initial purchase price, increased by OID previously included (or
currently includible) in such holder's gross income to the date of
disposition, and decreased by payments received on the Capital Securities
(other than any interest received with respect to the period prior to the
effective date of the Company's first exercise of its option to defer payments
of interest). Any such gain or loss generally will be a capital gain or loss,
and generally will be a long-term capital gain or loss if the Capital
Securities have been held for more than one year.
 
  A holder who disposes of his Capital Securities between record dates for
payments of distributions thereon will be required to include accrued but
unpaid interest (or OID) on the Subordinated Debt Securities through the date
of disposition in its taxable income for income tax purposes (notwithstanding
that the holder may receive a separate payment from the purchaser with respect
to accrued interest), and to deduct that amount from the sales proceeds
received (including the separate payment, if any, with respect to accrued
interest) for the Capital Securities (or as to OID only, to add such amount to
such holder's adjusted tax basis in its Capital Securities). To the extent the
selling price is less than the holder's adjusted tax basis (which will include
accrued but unpaid OID, if any), a holder will recognize a capital loss.
Subject to certain limited exceptions, capital losses cannot be applied to
offset ordinary income for income tax purposes.
 
NON-US HOLDERS
 
  The following discussion applies to an Initial Holder who is not a US Holder
(a "Non-US Holder").
 
  Payments to a holder of a Capital Security which is a Non-US Holder will
generally not be subject to withholding of income tax, provided that (a) the
beneficial owner of the Capital Security does not (directly or indirectly,
actually or constructively) own 10% or more of the total combined voting power
of all classes of stock of the Company entitled to vote, (b) the beneficial
owner of the Capital Security is not a controlled foreign corporation that is
related to the Company through stock ownership, and (c) either (i) the
beneficial owner of the
 
                                      67
<PAGE>
 
Capital Securities certifies to the Trust or its agent, under penalties of
perjury, that it is a Non-US Holder and provides its name and address, or (ii)
a securities clearing organization, bank or other financial institution that
holds customers' securities in the ordinary course of its trade or business (a
"Financial Institution"), and holds the Capital Security in such capacity,
certifies to the Trust or its agent, under penalties of perjury, that such a
statement has been received from the beneficial owner by it or by another
Financial Institution between it and the beneficial owner in the chain of
ownership, and furnishes the Trust or its agent with a copy thereof.
 
  As discussed above (see "Description of the Capital Securities--
Redemption"), changes in legislation affecting the income tax consequences of
the Subordinated Debt Securities are possible, and could adversely affect the
ability of the Company to deduct the interest payable on the Subordinated Debt
Securities. Moreover, any such legislation could adversely affect, as the
Proposed Legislation would have adversely affected, Non-US Holders by
characterizing income derived from the Subordinated Debt Securities as
dividends, generally subject to a 30% income tax (on a withholding basis) when
paid to a Non-US Holder, rather than as interest which, as discussed above, is
generally exempt from income tax in the hands of a Non-US Holder.
 
  A Non-US Holder of a Capital Security will generally not be subject to
withholding of income tax on any gain realized upon the sale or other
disposition of a Capital Security.
 
  A Non-US Holder which holds the Capital Securities in connection with the
active conduct of a United States trade or business will be subject to income
tax on all income and gains recognized with respect to its proportionate share
of the Subordinated Debt Securities.
 
  The exchange of the Old Capital Securities for the New Capital Securities in
the Exchange Offer should not constitute a taxable event to Non-US Holders.
 
INFORMATION REPORTING
 
  In general, information reporting requirements will apply to payments made
on, and proceeds from the sale of, the Capital Securities held by a
noncorporate US Holder within the United States. In addition, payments made
on, and payments of the proceeds from the sale of, the Capital Securities to
or through the United States office of a broker are subject to information
reporting unless the holder thereof certifies as to its non-United States
status or otherwise establishes an exemption from information reporting and
backup withholding. See "--Backup Withholding." Taxable income on the Capital
Securities for a calendar year should be reported to US Holders on Forms 1099
by the following January 31st.
 
BACKUP WITHHOLDING
 
  Payments made on, and proceeds from the sale of, the Capital Securities may
be subject to a "backup" withholding tax of 31% unless the holder complies
with certain identification or exemption requirements. Any amounts so withheld
will be allowed as a credit against the holder's income tax liability, or
refunded, provided the required information is provided to the Service.
 
                                    *  *  *
 
  THE PRECEDING DISCUSSION IS ONLY A SUMMARY AND DOES NOT ADDRESS THE
CONSEQUENCES TO A PARTICULAR HOLDER OF THE PURCHASE, OWNERSHIP AND DISPOSITION
OF THE CAPITAL SECURITIES. POTENTIAL HOLDERS OF THE CAPITAL SECURITIES ARE
URGED TO CONTACT THEIR OWN TAX ADVISORS TO DETERMINE THEIR PARTICULAR TAX
CONSEQUENCES.
 
                                      68
<PAGE>
 
                             ERISA CONSIDERATIONS
 
  Each fiduciary of a pension, profit-sharing or other employee benefit plan
subject to the Employee Retirement Income Security Act of 1974, as amended
("ERISA") (a "Plan"), should consider the fiduciary standards of ERISA in the
context of the Plan's particular circumstances before authorizing purchase of
the Capital Securities in a secondary transaction. Accordingly, among other
factors, the fiduciary should consider whether the investment would satisfy
the prudence and diversification requirements of ERISA and would be consistent
with the documents and instruments governing the Plan.
 
  Section 406 of ERISA and Section 4975 of the Code prohibit Plans, as well as
individual retirement accounts and Keogh plans subject to Section 4975 of the
Code (also "Plans"), from engaging in certain transactions involving "plan
assets" with persons who are "parties in interest" under ERISA or
"disqualified persons" under the Code ("Parties in Interest") with respect to
such Plan. A violation of these "prohibited transaction" rules may result in
an excise tax or other liabilities under ERISA and/or Section 4975 of the Code
for such persons, unless exemptive relief is available under an applicable
statutory or administrative exemption. Employee benefit plans that are
governmental plans (as defined in Section 3(32) of ERISA), certain church
plans (as defined in Section 3(33) of ERISA) and foreign plans (as described
in Section 4(b)(5) of ERISA) are not subject to the requirements of ERISA or
Section 4975 of the Code.
 
  Under a regulation (the "Plan Assets Regulation") issued by the U.S.
Department of Labor (the "DOL"), the assets of the Trust would be deemed to be
"plan assets" of a Plan for purposes of ERISA and Section 4975 of the Code if
"plan assets" of the Plan were used to acquire an equity interest in such
Trust and no exception were applicable under the Plan Assets Regulation. An
"equity interest" is defined under the Plan Assets Regulation as any interest
in an entity other than an instrument which is treated as indebtedness under
applicable local law and which has no substantial equity features and
specifically includes a beneficial interest in a trust.
 
  Pursuant to an exception contained in the Plan Assets Regulation, the assets
of the Trust would not be deemed to be "plan assets" of investing Plans if,
immediately after the most recent acquisition of any equity interest in the
Trust, less than 25% of the value of each class of equity interests in the
Trust were held by Plans, other employee benefit plans not subject to ERISA or
Section 4975 of the Code (such as governmental, church and foreign plans), and
entities holding assets deemed to be "plan assets" of any Plan (collectively,
"Benefit Plan Investors"). No assurance can be given that the value of the
Capital Securities held by Benefit Plan investors will be less than 25% of the
total value of such Capital Securities at any given time, and no monitoring or
other measures will be taken with respect to the satisfaction of the
conditions to this exception. All of the Common Securities will be purchased
and held by the Company.
 
  Certain transactions involving the Trust could be deemed to constitute
direct or indirect prohibited transactions under ERISA and Section 4975 of the
Code with respect to a Plan if the Capital Securities of the Trust were
acquired with "plan assets" of such Plan and assets of the Trust were deemed
to be "plan assets" of Plans investing in the Trust. For example, if the
Company is a Party in Interest with respect to an investing Plan (either
directly or by reason of its ownership of its subsidiaries), extensions of
credit between the Company and the Trust (as represented by the Subordinated
Debt Securities and the Guarantees) would likely be prohibited by Section
406(a)(1)(B) of ERISA and Section 4975(c)(1)(B) of the Code, unless exemptive
relief were available under an applicable administrative exemption (see
below).
 
  The DOL has issued five prohibited transaction class exemptions ("PTCEs")
that may provide exemptive relief for direct or indirect prohibited
transactions resulting from the purchase or holding of the Capital Securities,
assuming that assets of the Trust were deemed to be "plan assets" of Plans
investing in the Trust (see above). Those class exemptions are PTCE 96-23 (for
certain transactions determined by in-house asset managers), PTCE 95-60 (for
certain transactions involving insurance company general accounts), PTCE 91-38
(for certain transactions involving bank collective investment funds), PTCE
90-1 (for certain transactions involving insurance company separate accounts),
and PTCE 84-14 (for certain transactions determined by independent qualified
asset managers).
 
                                      69
<PAGE>
 
  Because the Capital Securities may be deemed to be equity interests in the
Trust for purposes of applying ERISA and Section 4975 of the Code, the Capital
Securities may not be purchased or held by any Plan, any entity whose
underlying assets include "plan assets" by reason of any Plan's investment in
the entity (a "Plan Asset Entity") or any person investing "plan assets" of
any Plan, unless such purchaser or holder is eligible for the exemptive relief
available under PTCE 96-23, 95-60, 91-38, 90-1 or 84-14.
 
  Due to the complexity of these rules and the penalties that may be imposed
upon persons involved in non-exempt prohibited transactions, it is
particularly important that fiduciaries or other persons considering
purchasing the Capital Securities on behalf of or with "plan assets" of any
Plan consult with their counsel regarding the potential consequences if the
assets of the Trust were deemed to be "plan assets" and the availability of
exemptive relief under PTCE 96-23, 95-60, 91-38, 90-1 or 84-14.
 
                                 LEGAL MATTERS
 
  The validity under Missouri law of the New Subordinated Debt Securities and
the New Guarantee and the validity under Delaware law of the New Capital
Securities have been passed upon for the Company and the Trust by Thompson
Coburn, St. Louis, Missouri. Certain United States federal income tax matters
have been, and will be in connection with the Exchange Offer, passed upon for
the Company and the Trust by Wachtell, Lipton, Rosen & Katz, New York, New
York.
 
                                    EXPERTS
   
  The consolidated financial statements of the Company as of December 31,
1996, 1995 and 1994, and for each of the years in the three-year period ended
December 31, 1996, incorporated by reference in the Company's Annual Report on
Form 10-K, and the supplemental consolidated financial statements of the
Company as of December 31, 1996, 1995 and 1994, and for each of the years in
the three-year period ended December 31, 1996, contained in the Company's
Current Report on Form 8-K dated May 13, 1997, have been incorporated by
reference herein in reliance upon the reports of KPMG Peat Marwick LLP,
independent certified public accountants, incorporated by reference herein,
and upon the authority of said firm as experts in accounting and auditing.
    
          
  The consolidated financial statements of Roosevelt as of December 31, 1996
and 1995 and for each of the years in the three-year period ended December 31,
1996, included in Roosevelt's Annual Report on Form 10-K/A-2 for the year
ended December 31, 1996, have been incorporated by reference herein in
reliance upon the report of KPMG Peat Marwick LLP, independent certified
public accountants, incorporated by reference herein, and upon the authority
of said firm as experts in accounting and auditing.     
 
                                      70
<PAGE>
 
NO DEALER, SALESPERSON OR OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS IN CONNECTION WITH THE EXCHANGE
OFFER MADE HEREBY EXCEPT AS CONTAINED IN THIS PROSPECTUS OR THE ACCOMPANYING
LETTER OF TRANSMITTAL, AND IF GIVEN OR MADE, NO SUCH INFORMATION OR
REPRESENTATION SHOULD BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY,
THE TRUST OR ANY OF THEIR RESPECTIVE AGENTS. NEITHER THE DELIVERY OF THIS
PROSPECTUS NOR THE ACCOMPANYING LETTER OF TRANSMITTAL OR BOTH TOGETHER NOR ANY
SALE MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE ANY IMPLICATION
THAT THERE HAS BEEN NO CHANGE IN THE INFORMATION SET FORTH HEREIN OR IN THE
AFFAIRS OF THE COMPANY OR THE TRUST SINCE THE DATE HEREOF. NEITHER THE
DELIVERY OF THIS PROSPECTUS NOR THE ACCOMPANYING LETTER OF TRANSMITTAL OR BOTH
TOGETHER CONSTITUTES AN OFFER TO SELL OR A SOLICITATION OF AN OFFER TO BUY THE
CAPITAL SECURITIES BY ANYONE IN ANY JURISDICTION IN WHICH SUCH OFFER OR
SOLICITATION IS NOT AUTHORIZED OR IN WHICH THE PERSON MAKING SUCH OFFER OR
SOLICITATION IS NOT QUALIFIED TO DO SO OR TO ANY PERSON TO WHOM IT IS UNLAWFUL
TO MAKE SUCH OFFER OR SOLICITATION.
 
                                --------------
 
                               TABLE OF CONTENTS
<TABLE>   
<CAPTION>
                                                                           PAGE
                                                                           ----
<S>                                                                        <C>
Available Information.....................................................   6
Incorporation of Certain Information by Reference.........................   6
Summary...................................................................   8
Risk Factors..............................................................  17
Mercantile Bancorporation Inc.............................................  23
Recent Developments.......................................................  24
Capitalization............................................................  25
Accounting Treatment......................................................  26
Ratio of Earnings to Combined Fixed Charges and Preferred Stock Dividends
 .........................................................................  26
Use of Proceeds...........................................................  26
Mercantile Capital Trust I................................................  27
The Exchange Offer........................................................  28
Description of the Capital Securities.....................................  36
Description of the Guarantee..............................................  49
Description of the Subordinated Debt Securities...........................  52
Effect of Obligations Under the Subordinated Debt Securities and the
 Guarantee................................................................  63
Plan of Distribution......................................................  64
United States Federal Income Taxation.....................................  65
ERISA Considerations......................................................  69
Legal Matters.............................................................  70
Experts...................................................................  70
</TABLE>    
 
$150,000,000
       
LOGO
 
MERCANTILE
CAPITAL TRUST I
 
FLOATING RATE CAPITAL TRUST
PASS-THROUGH SECURITIESSM
(TRUPSSM)
 
(LIQUIDATION AMOUNT $1,000 PER CAPITAL SECURITY)
 
FULLY AND UNCONDITIONALLY GUARANTEED, AS DESCRIBED HEREIN, BY
 
MERCANTILE
BANCORPORATION INC.
 
PROSPECTUS
 
DATED         , 1997
 
<PAGE>
 
                                    PART II
 
                  INFORMATION NOT REQUIRED IN THE PROSPECTUS
 
ITEM 20. INDEMNIFICATION OF OFFICERS AND DIRECTORS
 
  Sections 351.355(1) and (2) of The General and Business Corporation Law of
the State of Missouri provide that a corporation may indemnify any person who
was or is a party or is threatened to be made a party to any threatened,
pending or completed action, suit or proceeding by reason of the fact that he
is or was a director, officer, employee or agent of the corporation, or is or
was serving at the request of the corporation as a director, officer, employee
or agent of another corporation, partnership, joint venture, trust or other
enterprise, against expenses, judgments, fines and amounts paid in settlement
actually and reasonably incurred by him in connection with such action, suit
or proceeding if he acted in good faith and in a manner he reasonably believed
to be in or not opposed to the best interests of the corporation and, with
respect to any criminal action or proceeding, had no reasonable cause to
believe his conduct was unlawful, except that, in the case of an action or
suit by or in the right of the corporation, the corporation may not indemnify
such persons against judgments and fines and no person shall be indemnified as
to any claim, issue or matter as to which such person shall have been adjudged
to be liable for negligence or misconduct in the performance of his duty to
the corporation, unless and only to the extent that the court in which the
action or suit was brought determines upon application that such person is
fairly and reasonably entitled to indemnity for proper expenses. Section
351.355(3) provides that, to the extent that a director, officer, employee or
agent of the corporation has been successful in the defense of any such
action, suit or proceeding or any claim, issue or matter therein, he shall be
indemnified against expenses, including attorneys' fees, actually and
reasonably incurred in connection with such action, suit or proceeding.
Section 351.355(7) provides that a corporation may provide additional
indemnification to any person indemnifiable under subsection (1) or (2),
provided such additional indemnification is authorized by the corporation's
articles of incorporation or an amendment thereto or by a shareholder-approved
bylaw or agreement, and provided further that no person shall thereby be
indemnified against conduct which was finally adjudged to have been knowingly
fraudulent, deliberately dishonest or willful misconduct or which involved an
accounting for profits pursuant to Section 16(b) of the Securities Exchange
Act of 1934.
 
  Article 12 of the Restated Articles of Incorporation of the Registrant
provides that the Registrant shall extend to its directors and executive
officers the indemnification specified in subsections (1) and (2) and the
additional indemnification authorized in subsection (7) and that it may extend
to other officers, employees and agents such indemnification and additional
indemnification.
 
  Pursuant to directors' and officers' liability insurance policies, with
total annual limits of $30,000,000, the Registrant's directors and officers
are insured, subject to the limits, retention, exceptions and other terms and
conditions of such policy, against liability for any actual or alleged error,
misstatement, misleading statement, act or omission, or neglect or breach of
duty by the directors or officers of the Registrant, individually or
collectively, or any matter claimed against them solely by reason of their
being directors or officers of the Registrant.
 
ITEM 21. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 
  A. Exhibits. See Exhibit Index.
 
  B. Financial Statement Schedules. Not Applicable.
 
ITEM 22. UNDERTAKINGS
 
  (1) Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors, officers and controlling persons of
each Registrant pursuant to the foregoing provisions, or otherwise, each
Registrant has been advised that in the opinion of the Securities and Exchange
Commission such indemnification is against public policy as expressed in the
Act and is, therefore, unenforceable. In the event that
 
                                     II-1
<PAGE>
 
a claim for indemnification against such liabilities (other than the payment
by each Registrant of expenses incurred or paid by a director, officer or
controlling person of each Registrant in the successful defense of any action,
suit or proceeding) is asserted by such director, officer or controlling
person in connection with the securities being registered, each Registrant
will, unless in the opinion of its counsel the matter has been settled by
controlling precedent, submit to a court of appropriate jurisdiction the
question of whether such indemnification by it is against public policy as
expressed in the Act and will be governed by the final adjudication of such
issue.
 
  (2) Each of the undersigned Registrants hereby undertake that, for purposes
of determining any liability under the Securities Act of 1933, each filing of
a Registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Securities Exchange Act of 1934 (and, where applicable, each filing of an
employee benefit plan's annual report pursuant to Section 15(d) of the
Securities Exchange Act of 1934) that is incorporated by reference in the
Registration Statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such
securities at that time shall be deemed to be the initial bona fide offering
thereof.
 
  (3) Each of the undersigned Registrants hereby undertake as follows: that
prior to any public reoffering of the securities registered hereunder through
use of a prospectus which is a part of this Registration Statement, by any
person or party who is deemed to be an underwriter within the meaning of Rule
145(c), the issuer undertakes that such reoffering prospectus will contain the
information called for by the applicable registration form with respect to
reofferings by persons who may be deemed underwriters, in addition to the
information called for by the other Items of the applicable form.
 
  (4) Each of the Registrants undertake that every prospectus (i) that is
filed pursuant to paragraph (3) immediately preceding, or (ii) that purports
to meet the requirements of section 10(a)(3) of the Act and is used in
connection with an offering of securities subject to Rule 415 (Section 230.415
of this chapter), will be filed as a part of an amendment to the Registration
Statement and will not be used until such amendment is effective, and that,
for purposes of determining any liability under the Securities Act of 1933,
each such post-effective amendment shall be deemed to be a new registration
statement relating to the securities offering therein, and the offering of
such securities at that time shall be deemed to be the initial bona fide
offering thereof.
 
  (5) Each of the undersigned Registrants hereby undertake to respond to
requests for information that is incorporated by reference into the prospectus
pursuant to Item 4, 10(b), 11 or 13 of this Form, within one business day of
receipt of such request and to send the incorporated documents by first class
mail or other equally prompt means. This includes information contained in the
documents filed subsequent to the effective date of the Registration Statement
through the date of responding to the request.
 
  (6) Each of the undersigned Registrants hereby undertake to supply by means
of a post-effective amendment all information concerning a transaction, and
the company being acquired involved therein, that was not the subject of and
included in the Registration Statement when it became effective.
 
  (7) Each of the undersigned Registrants hereby undertake:
 
    (a) To file during any period in which offers and sales are being made, a
  post-effective amendment to this Registration Statement:
 
      (i) To include any prospectus required by Section 10(a)(3) of the
    Securities Act of 1933;
 
      (ii) To reflect in the prospectus any facts or events arising after
    the effective date of the Registration Statement (or the most recent
    post-effective amendment thereof), which individually or in the
    aggregate, represent a fundamental change in the information set forth
    in the Registration Statement;
 
      (iii) To include any material information with respect to the plan of
    distribution not previously disclosed in the Registration Statement or
    any material change to such information in the Registration Statement.
 
                                     II-2
<PAGE>
 
    (b) That for the purpose of determining any liability under the
  Securities Act of 1933, each such post-effective amendment shall be deemed
  to be a new registration statement relating to the securities offered
  therein, and the offering of such securities at that time shall be deemed
  to be the initial bona fide offering thereof.
 
    (c) To remove from registration by means of a post-effective amendment
  any of the securities being registered which remain unsold at the
  termination of the offering.
 
                                     II-3
<PAGE>
 
                                  SIGNATURES
 
  Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing a Registration Statement on Form S-4 and has duly
caused this Amendment No. 1 to the Registration Statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of St.
Louis, State of Missouri, on May 23, 1997.
 
                                          Mercantile Bancorporation Inc.
 
                                          By: /s/ John Q. Arnold
                                             ----------------------------------
                                             John Q. Arnold, Senior Executive
                                            Vice President and Chief Financial
                                                          Officer
 
  Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities and on the date indicated.
 
<TABLE>
<CAPTION>
             SIGNATURE                           TITLE                    DATE
             ---------                           -----                    ----
 
<S>                                  <C>                           <C>
                  *                  Chairman of the Board            May 23, 1997
____________________________________  President, Chief Executive
         Thomas H. Jacobsen           Officer and Director
    Principal Executive Officer
 
         /s/ John Q. Arnold          Senior Executive Vice            May 23, 1997
____________________________________  President and Chief
           John Q. Arnold             Financial Officer
    Principal Financial Officer
 
                  *                  Senior Vice President--          May 23, 1997
____________________________________  Finance and Control
         Michael T. Normile
    Principal Accounting Officer
 
                  *                  Director                         May 23, 1997
____________________________________
       Harry M. Cornell, Jr.
 
                  *                  Director                         May 23, 1997
____________________________________
          William A. Hall
 
                                     Director
____________________________________
           Thomas A. Hays
 
                  *                  Director                         May 23, 1997
____________________________________
          Frank Lyon, Jr.
 
                  *                  Director                         May 23, 1997
____________________________________
         Edward A. Mueller
 
</TABLE>
 
                                     II-4
<PAGE>
 
<TABLE>
<CAPTION>
             SIGNATURE                           TITLE                    DATE
             ---------                           -----                    ----
<S>                                  <C>                           <C>
                  *                  Director                         May 23, 1997
____________________________________
          Robert W. Murray
 
                  *                  Director                         May 23, 1997
____________________________________
          Harvey Saligman
 
                  *                  Director                         May 23, 1997
____________________________________
          Craig D. Schnuck
 
                  *                  Director                         May 23, 1997
____________________________________
          Robert L. Stark
 
                  *                  Director                         May 23, 1997
____________________________________
         Patrick T. Stokes
 
                  *                  Director                         May 23, 1997
____________________________________
           John A. Wright
 
</TABLE>
 
                                         *By: /s/ John Q. Arnold
                                             ----------------------------------
                                                      John Q. Arnold
 
  John Q. Arnold, by signing his name hereto, does sign this document on
behalf of the persons named above, pursuant to a power of attorney duly
executed by such persons and previously filed.
 
  Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing a Registration Statement on Form S-4 and has duly
caused this Amendment No. 1 to the Registration Statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of St.
Louis, State of Missouri, on May 23, 1997.
 
                                          Mercantile Capital Trust I
 
                                          By: /s/ Jon W. Bilstrom
                                             ----------------------------------
                                              Jon W. Bilstrom, Administrator
 
                                     II-5
<PAGE>
 
                                 EXHIBIT INDEX
 
<TABLE>   
<CAPTION>
 EXHIBIT
 NUMBER                           DESCRIPTION                            PAGE
 -------                          -----------                            ----
 <C>     <S>                                                             <C>
 3.1      MBI's Restated Articles of Incorporation, as amended and
          currently in effect, filed as Exhibit 3 to MBI's Quarterly
          Report on Form 10-Q for the quarter ended March 31, 1997,
          are incorporated herein by reference.
 3.2      MBI's By-Laws, as amended and currently in effect, filed as
          Exhibit 3.2 to Amendment No. 2 to MBI's Registration
          Statement on Form S-4 (Reg. No. 333-17757), is incorporated
          herein by reference.
 4.1      Form of Indenture Regarding Subordinated Securities between
          MBI and The First National Bank of Chicago, Trustee, filed
          as Exhibit 4.1 to MBI's Report on Form 8-K dated September
          24, 1992, is incorporated herein by reference.
 4.2      Rights Agreement dated as of May 23, 1988 between MBI and
          Mercantile Bank, as Rights Agent (including as exhibits
          thereto the form of Certificate of Designation, Preferences
          and Rights of Series A Junior Participating Preferred Stock
          and the form of Right Certificate), filed as Exhibits 1 and
          2 to MBI's Registration Statement No. 0-6045 on Form 8-A,
          dated May 24, 1988, is incorporated herein by reference.
 4.3      Certificate of Trust of Mercantile Capital Trust I dated as
          of January 28, 1997.*
 4.4      Amended and Restated Declaration of Trust dated as of
          February 4, 1997 among Chase Manhattan Bank Delaware, as
          Delaware Trustee, The Chase Manhattan Bank, as
          Institutional Trustee, MBI, as Sponsor, and John Q. Arnold,
          Kenneth E. Schutte and Jon W. Bilstrom, as Administrators
          of Mercantile Capital Trust I.*
 4.5      Indenture dated February 4, 1997 between MBI, as Issuer,
          and The Chase Manhattan Bank, as Indenture Trustee.*
 4.6      First Supplemental Indenture dated February 4, 1997 between
          MBI, as Issuer, and The Chase Manhattan Bank, as Indenture
          Trustee.*
 4.7      Form of Capital Security Certificate for Mercantile Capital
          Trust I (included as Exhibit A-1 to Exhibit 4.4).*
 4.8      Capital Securities Guarantee Agreement dated February 4,
          1997 between MBI and The Chase Manhattan Bank, as Guarantee
          Trustee.*
 4.9      Registration Rights Agreement dated January 29, 1997 by and
          among MBI, Mercantile Capital Trust I and Salomon Brothers
          Inc, as Representative of the Initial Purchasers.*
 4.10     Form of Subordinated Debt Security (included as part of
          Exhibit 4.6).*
 4.11     Waiver of Certain Obligations under Registration Rights
          Agreement dated May 22, 1997 between MBI and Mercantile
          Capital Trust I.
 4.12     Supplemental Indenture of First Supplemental Indenture
          dated May 22, 1997 between MBI, as Issuer, and The Chase
          Manhattan Bank, as Trustee.
 5.1      Opinion of Thompson Coburn as to the legality of the
          Floating Rate Capital Trust Pass-through Securities of
          Mercantile Capital Trust I, the Floating Rate Junior
          Subordinated Deferrable Interest Debentures due 2027 of MBI
          and the Guarantee of MBI with respect to the Capital
          Securities.*
 8.1      Opinion of Wachtell, Lipton, Rosen & Katz with respect to
          certain federal income tax consequences.*
</TABLE>    
 
 
                                      II-6
<PAGE>
 
<TABLE>
<CAPTION>
 EXHIBIT
 NUMBER                          DESCRIPTION                            PAGE
 -------                         -----------                            ----
 <C>     <S>                                                            <C>
 10.1     The Mercantile Bancorporation Inc. 1987 Stock Option Plan,
          as amended, filed as Exhibit 10-3 to MBI's Report on Form
          10-K for the year ended December 31, 1989 (File No. 1-
          11792), is incorporated herein by reference.
 10.2     The Mercantile Bancorporation Inc. Executive Incentive
          Compensation Plan, filed as Appendix C to MBI's definitive
          Proxy Statement for the 1994 Annual Meeting of
          Shareholders is incorporated herein by reference.
 10.3     The Mercantile Bancorporation Inc. Employee Stock Purchase
          Plan, filed as Exhibit 10-7 to MBI's Report on Form 10-K
          for the year ended December 31, 1989 (File No. 1-11792),
          is incorporated herein by reference.
 10.4     The Mercantile Bancorporation Inc. 1991 Employee Incentive
          Plan, filed as Exhibit 10-7 to MBI's Report on Form 10-K
          for the year ended December 31, 1990 (File No. 1-11792),
          is incorporated herein by reference.
 10.5     Amendment Number One to the Mercantile Bancorporation Inc.
          1991 Employee Incentive Plan, filed as Exhibit 10-6 to
          MBI's Report on Form 10-K for the year ended December 31,
          1994, is incorporated herein by reference.
 10.6     The Mercantile Bancorporation Inc. 1994 Stock Incentive
          Plan, filed as Appendix B to MBI's definitive Proxy
          Statement for the 1994 Annual Meeting of Shareholders, is
          incorporated herein by reference.
 10.7     The Mercantile Bancorporation Inc. 1994 Stock Incentive
          Plan for Non-Employee Directors, filed as Appendix E to
          MBI's definitive Proxy Statement for the 1994 Annual
          Meeting of Shareholders, is incorporated herein by
          reference.
 10.8     The Mercantile Bancorporation Inc. Voluntary Deferred
          Compensation Plan, filed as Appendix D to MBI's definitive
          Proxy Statement for the 1994 Annual Meeting of
          Shareholders, is incorporated herein by reference.
 10.9     Form of Employment Agreement for Thomas H. Jacobsen, as
          amended, filed as Exhibit 10-8 to MBI's Report on Form 10-
          K for the year ended December 31, 1989 (File No. 1-11792),
          is incorporated herein by reference.
 10.10    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 MBI's
          Report on Form 10-K for the year ended December 31, 1989
          (File No. 1-11792), is incorporated herein by reference.
 10.11    Amended and Restated Agreement and Plan of Reorganization
          dated as of December 2, 1994 by and among MBI and
          TCBankshares, Inc., filed as Exhibit 2.1 to MBI's Report
          on Form 8-K dated December 21, 1994, is incorporated herein 
          by reference.
 10.12    Agreement and Plan of Reorganization dated August 4, 1995,
          by and between MBI and Hawkeye Bancorporation, filed as
          Exhibit 2.1 to MBI's Registration Statement No. 33-63609,
          is incorporated herein by reference.
 10.13    The Mercantile Bancorporation Inc. Supplemental Retirement
          Plan, filed as Exhibit 10-12 to MBI's Report on Form 10-K
          for the year ended December 31, 1992 (File No. 1-11792),
          is incorporated herein by reference.
 10.14    Agreement and Plan of Reorganization, dated October 27,
          1996, among MBI, Ameribanc and Mark Twain Bancshares,
          Inc., filed as Exhibit 2.1 to MBI's Current Report on Form
          8-K, dated November 6, 1996, is incorporated herein by
          reference.
 10.15    Agreement and Plan of Reorganization, dated December 22,
          1996, by and between MBI and Roosevelt Financial Group,
          Inc., filed as Exhibit 2.1 to MBI's Current Report on Form
          8-K, dated December 22, 1996, is incorporated herein by
          reference.
</TABLE>
 
 
                                      II-7
<PAGE>
 
<TABLE>   
<CAPTION>
 EXHIBIT
 NUMBER                           DESCRIPTION                            PAGE
 -------                          -----------                            ----
 <C>     <S>                                                             <C>
 10.16    Amendment to Agreement and Plan of Reorganization, dated
          January 24, 1997, among MBI, Ameribanc and Mark Twain
          Bancshares, Inc., filed as Exhibit 10.16 to Amendment No. 2
          to MBI's Registration Statement on Form S-4 (Reg. No. 333-
          17757), is incorporated herein by reference.
 10.17    The Mercantile Bancorporation Inc. Amended and Restated
          Stock Incentive Plan, filed as Annex G to MBI's definitive
          Proxy Statement for the 1997 Annual Meeting of
          Shareholders, is incorporated herein by reference.
 10.18    The Mercantile Bancorporation Inc. Amended and Restated
          Executive Incentive Compensation Plan, filed as Annex H to
          MBI's definitive Proxy Statement for the 1997 Annual
          Meeting of Shareholders, is incorporated herein by
          reference.
 10.19    Employment Agreement for Alvin J. Siteman dated November
          18, 1996, filed as Exhibit 10.3 to MBI's Quarterly Report
          on Form 10-Q for the quarter ended March 31, 1997, is
          incorporated herein by reference.
 10.20    Employment Agreement for John P. Dubinsky dated October 27,
          1996, filed as Exhibit 10.4 to MBI's Quarterly Report on
          Form 10-Q for the quarter ended March 31, 1997, is
          incorporated herein by reference.
 12.1     Statement of Earnings to Fixed Charges.
 23.1     Consent of Thompson Coburn (included in Exhibit 5.1).*
 23.2     Consent of Wachtell, Lipton, Rosen & Katz (included in
          Exhibit 8.1).*
 23.3     Consent of KPMG Peat Marwick LLP with regard to the use of
          its reports on MBI's financial statements.
 23.4     Consent of KPMG Peat Marwick LLP with regard to the use of
          its report on Roosevelt's financial statements.
 24.1     Power of Attorney (included on signature page).*
 25.1     Form T-1 Statement of Eligibility for The Chase Manhattan
          Bank to act as trustee under the Indenture.*
 25.2     Form T-1 Statement of Eligibility for The Chase Manhattan
          Bank to act as trustee under the Amended and Restated
          Declaration of Trust.*
</TABLE>    
- --------
   
*  Previously filed on April 14, 1997.     
 
                                      II-8

<PAGE>
                                                                    Exhibit 4.11

                         WAIVER OF CERTAIN OBLIGATIONS

                                     UNDER

                         REGISTRATION RIGHTS AGREEMENT

    
          WAIVER, dated as of May 22, 1997 (the "Waiver"), of certain
obligations of Mercantile Bancorporation Inc., a Missouri corporation (the
"Company"), under the Registration Rights Agreement (the "Registration
Agreement"), dated January 29, 1997.     

          WHEREAS, the Company and Mercantile Capital Trust I (the "Trust")
heretofore executed and delivered the Registration Agreement to Salomon Brothers
Inc, as representative for several Initial Purchasers; and

          WHEREAS, the Company has requested the Holders of the Capital
Securities to waive compliance with the Company's obligations under Section 4(e)
of the Registration Agreement to cause the Capital Securities and the Exchange
Securities to be listed on the New York Stock Exchange and to maintain such
listing (the "Listing Requirement Covenant"); and

          WHEREAS, Section 7(b) of the Registration Agreement provides that,
with the consent of the Holders of not less than a majority in aggregate
liquidation amount of the Capital Securities at the time outstanding (the
"Requisite Consents"), the Company and the Trust may waive compliance with the
Company's obligations under the Registration Agreement; and

          WHEREAS, the Company and the Trust have obtained the Requisite
Consents and this Waiver has been duly authorized by all necessary corporate
action on the part of the Company;

          NOW, THEREFORE, the Company and the Trust agree as follows:

                                   ARTICLE 1

                                     WAIVER

          Section 1.01  The Company's obligations under Section 4(e) of the
Registration Agreement is hereby irrevocably and permanently waived.

          Section 1.02  The remaining provisions of the Registration Agreement
shall remain in full force and effect.

                                   ARTICLE 2

                                 MISCELLANEOUS

          SECTION 2.01  Effect of Waiver.  Upon the execution and delivery of
this Waiver by the Company and the Trust, this Waiver shall form a part of the
Registration Agreement for all purposes, and every Holder of Capital Securities
and the Exchange Securities heretofore or hereafter authenticated and delivered
under the Registration Agreement shall be bound thereby.

          SECTION 2.02  Terms Defined in the Registration Agreement.  All
capitalized terms not otherwise defined herein shall have the meanings ascribed
to them in the Registration Agreement.

<PAGE>
 
 
          SECTION 2.03 Headings. The headings in this Waiver have been inserted
for convenience of reference only and shall not limit or otherwise affect the
meaning hereof.

          SECTION 2.04 Successors. This Waiver shall inure to the benefit of and
be binding upon the successors and assigns of each of the parties, including,
without the need for an express assignment or any consent by the Company and the
Trust thereto, subsequent Holders of Capital Securities and/or Exchange
Securities.

          SECTION 2.05 Governing Law. This Waiver shall be governed by and
construed in accordance with the internal laws of the State of New York
applicable to agreements made and to be performed in said State.

          SECTION 2.06 Counterpart Originals. This Waiver may be executed in any
number of counterparts each of which shall be an original; but such counterparts
shall together constitute but one and the same instrument.

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


    
 
                     MERCANTILE BANCORPORATION INC.

                     By: /s/ Kenneth E. Schutte
                         -----------------------------------------        
                         Kenneth E. Schutte, Senior Vice President 
                         and Treasurer
                         

                     MERCANTILE CAPITAL TRUST I

                     By: THE CHASE MANHATTAN BANK, as Trustee

                     By: /s/ R. J. Halleran
                         ----------------------------------------- 
                         Ronald J. Halleran
                         Second Vice President     

                                      -2-


<PAGE>
                                                                    Exhibit 4.12
 
                            SUPPLEMENTAL INDENTURE

                                      to

                         FIRST SUPPLEMENTAL INDENTURE

    
          SUPPLEMENTAL INDENTURE, dated as of May 22, 1997 (the "Supplemental
Indenture"), to First Supplemental Indenture, dated as of February 4, 1997 (the
"First Supplemental Indenture"), between Mercantile Bancorporation Inc., a
Missouri corporation (the "Company"), and The Chase Manhattan Bank, as trustee
(the "Trustee"), under the Indenture dated as of February 4, 1997 between the
Company and the Trustee (the "Indenture").     

          WHEREAS, the Company and the Trustee heretofore executed and delivered
the Indenture, as supplemented by the First Supplemental Indenture; and

          WHEREAS, pursuant to the Indenture and the First Supplemental
Indenture, the Company issued and the Trustee authenticated and delivered
$154,640,000 aggregate principal amount of the Company's Floating Rate Junior
Subordinated Deferrable Interest Debentures due 2027 (the "Old Subordinated
Debentures"); and

          WHEREAS, Section 9.02 of the Indenture provides that with the consent
of the Holders of not less than a majority in aggregate liquidation amount of
the Trust Securities at the time outstanding (the "Requisite Consents"), the
Company, when authorized by a resolution of its Board of Directors, and the
Trustee may enter into an amended or supplemental Indenture; and

          WHEREAS, the Company has obtained the Requisite Consents to amend the
First Supplemental Indenture in certain respects; and

          WHEREAS, this Supplemental Indenture has been duly authorized by all
necessary corporate action on the part of the Company;

          NOW, THEREFORE, the Company and the Trustee agree as follows for the
equal and ratable benefit of the Holders of the Old Subordinated Debentures:

                                   ARTICLE 1

      AMENDMENTS TO CERTAIN PROVISIONS OF THE FIRST SUPPLEMENTAL INDENTURE

          SECTION 1.01  Amendment of Certain Sections of the Indenture.

          A. Subject to Section 2.01 hereof, the First Supplemental Indenture is
hereby amended by replacing the last sentence in Section 2.1 thereof with the
following:

             "The Debentures shall be issued in minimum denominations of
$100,000 and any integral multiple of $1,000 in excess thereof and may be
transferred only in blocks having an aggregate principal amount of not less than
$100,000. Any transfer of the Debentures in a block having an aggregate
principal amount of less than $100,000 shall be deemed to be void and of no
legal effect whatsoever. Any transferee of the Debentures having an aggregate
principal amount of less than $100,000 shall be deemed not to be the holder of
such Debentures for any purpose, including, but not limited to, the receipt of
payments on such Debentures and such transferee shall be deemed to have no
interest whatsoever in such Debentures."


<PAGE>
 
          B. Subject to Section 2.01 hereof, the First Supplemental Indenture is
hereby amended by deleting the following proviso and the corresponding end
bracket in the third to the last paragraph in Article VI:

            "[IF THIS DEBENTURE IS AN INITIAL DEBENTURE INSERT --]"

                                   ARTICLE 2

                                 MISCELLANEOUS

          SECTION 2.01 Effect of Supplemental Indenture. Upon the execution and
delivery of this Supplemental Indenture by the Company and the Trustee, the
First Supplemental Indenture shall be supplemented in accordance herewith, and
this Supplemental Indenture shall form a part of the First Supplemental
Indenture for all purposes, and every Holder of Debt Securities heretofore or
hereafter authenticated and delivered under the Indenture and the First
Supplemental Indenture shall be bound thereby. This Supplemental Indenture is an
indenture supplemental to and in implementation of the Indenture and the First
Supplemental Indenture, and the Indenture, the First Supplemental Indenture and
this Supplemental Indenture shall henceforth be read and construed together.
Except as supplemented hereby, all provisions in the Indenture and the First
Supplemental Indenture shall remain in full force and effect. The Indenture as
supplemented by the First Supplemental Indenture and this Supplemental Indenture
is in all respects confirmed and preserved.

          SECTION 2.02 Conflict with Trust Indenture Act. If any provision of
this Supplemental Indenture limits, qualifies or conflicts with any provision of
the Trust Indenture Act of 1939, as amended (the "TIA"), that is required under
the TIA to be part of and govern any provision of this Supplemental Indenture,
the provision of the TIA shall control. If any provision of this Supplemental
Indenture modifies or excludes any provision of the TIA that may be so modified
or excluded, the provision of the TIA shall be deemed to apply to the Indenture
as so modified or to be excluded by this Supplemental Indenture, as the case may
be.

          SECTION 2.03 Severability. In case any one or more of the provisions
contained in this Supplemental Indenture shall for any reason be held to be
invalid, illegal or unenforceable in any respect, such invalidity, illegality or
unenforceability shall not affect any other provisions of this Supplemental
Indenture, but this Supplemental Indenture shall be construed as if such invalid
or illegal or unenforceable provision had never been contained herein or
therein.

          SECTION 2.04 Terms Defined in the Indenture and the First Supplemental
Indenture. All capitalized terms not otherwise defined herein shall have the
meanings ascribed to them in the Indenture and the First Supplemental Indenture.

          SECTION 2.05 Headings. The Article and Section headings of this
Supplemental Indenture have been inserted for convenience of reference only, are
not to be considered a part of this Supplemental Indenture and shall in no way
modify or restrict any of the terms or provisions hereof.

          SECTION 2.06 Successors. All agreements of the Company in this
Supplemental Indenture shall bind its successors. All agreements of the Trustee
in this Supplemental Indenture shall bind its successors.

          SECTION 2.07 Trustee Not Responsible for Recitals. The recitals herein
contained are made by the Company and not by the Trustee, and the Trustee
assumes no responsibility for the correctness thereof. The Trustee makes no
representation as to the validity or sufficiency of this Supplemental Indenture.

                                      -2-

<PAGE>
 

          SECTION 2.08 Governing Law. This Supplemental Indenture and each
Debenture shall be deemed to be a contract made under the internal laws of the
State of New York, and for all purposes shall be construed in accordance with
the laws of said State without regard to conflict of laws principles thereof.

          SECTION 2.09 Counterpart Originals. This Supplemental Indenture may be
executed in any number of counterparts each of which shall be an original; but
such counterparts shall together constitute but one and the same instrument.

          IN WITNESS WHEREOF, the parties hereto have caused this Supplemental
Indenture to be duly executed as of the date and year first above written.

                              MERCANTILE BANCORPORATION INC.

                              By: /s/ Kenneth E. Schutte
                                  -------------------------------
                                  Kenneth E. Schutte, Senior Vice
                                  President and Treasurer

                              THE CHASE MANHATTAN BANK, as Trustee
    
                              By: /s/ R. J. Halleran      
                                  ------------------------------
                                  Ronald J. Halleran, Second
                                  Vice President

                                      -3-


<PAGE>

                                                                    EXHIBIT 12.1
 
                        MERCANTILE BANCORPORATION INC.
                      Ratio of Earnings to Fixed Charges
                            (dollars in thousands)
   
<TABLE>
<CAPTION>


                                              Three Months                Years Ended December 31,
                                                 Ended       ------------------------------------------------
                                             March 31, 1997    1996      1995      1994      1993      1992
                                             --------------  --------  --------  --------  --------  --------
<S>                                          <C>             <C>       <C>       <C>       <C>       <C>
Earnings:
Earnings before income taxes.............          $116,023  $373,750  $430,287  $368,952  $314,940  $247,860
Junior subordinated debt expense.........             2,438     9,750     9,750     9,750     9,750     9,750
Interest on deposits.....................           153,762   603,989   580,869   436,510   451,616   567,519
Interest on indebtedness.................            31,114   120,921   134,597    85,032    56,853    61,318
Rental expense...........................            15,184    15,184    15,010    14,908    14,925    14,280
One-third of rental expense..............             3,796     5,061     5,003     4,969     4,975     4,760

Ratio of Earnings to Fixed Charges (1):
Excluding Interest on Deposits...........             4.00x     3.75x     3.88x     4.70x     5.40x     4.27x
Including Interest on Deposits...........             1.62x     1.51x     1.59x     1.69x     1.60x     1.39x
</TABLE>     

                                                                               
- -------------------
(1)  For purposes of calculating the ratio of earnings to fixed charges,
     earnings consist of earnings before income taxes plus interest and one-
     third of rental expense.  Fixed charges, excluding interest on deposits,
     consists of interest on indebtedness and one-third of rental expense (which
     is deemed representative of the interest factor).  Fixed charges, including
     interest on deposits, consists of both the foregoing items plus interest on
     deposits.

<PAGE>
 
                                                                    Exhibit 23.3



                         Independent Auditors' Consent


The Board of Directors and Stockholders
Mercantile Bancorporation Inc.:

We consent to the use of our report incorporated herein by reference and to the 
reference to our firm under the heading "Experts" in the prospectus.


                                                       /s/ KPMG Peat Marwick LLP


St. Louis, Missouri
May 23, 1997





<PAGE>
 
                                                                    EXHIBIT 23.4



                         Independent Auditors' Consent


The Board of Directors and Stockholders
Roosevelt Financial Group, Inc.:

We consent to the use of our report incorporated herein by reference and to the 
reference to our firm under the heading "Experts" in the prospectus.


                                                       /s/ KPMG Peat Marwick LLP


St. Louis, Missouri
May 23, 1997



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