Document:

<PAGE>
                          [FORM OF STOCK CERTIFICATE]
                                                                     Exhibit 4.1

                  BOARD OF TRADE OF THE CITY OF CHICAGO, INC.
COMMON SHARES                                                      COMMON SHARES

CLASS A COMMON STOCK                                 CUSIP:
                                             SEE REVERSE FOR CERTAIN DEFINITIONS

                  BOARD OF TRADE OF THE CITY OF CHICAGO, INC.
             INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE

This Certifies that

                                [LOGO OF CBOT]

is the record holder of

 FULLY PAID AND NON-ASSESSABLE SHARES OF CLASS A COMMON STOCK, PAR VALUE $0.001
           PER SHARE, OF BOARD OF TRADE OF THE CITY OF CHICAGO, INC.

transferable only on the books of the Corporation by the holder hereof in
person or by duly authorized Attorney upon surrender of this Certificate
properly endorsed. [This Certificate is not valid unless countersigned and
registered by the Transfer Agent and Registrar.]

In Witness Whereof the Corporation has caused this Certificate to be executed
and attested to by the manual or facsimile signatures of its duly authorized
officers, under a facsimile of its corporate seal to be affixed hereto.
Dated:

/s/                              [CBOT seal]               /s/
   ----------------                                           ---------------
      SECRETARY                                                  PRESIDENT

[COUNTERSIGNED AND REGISTERED:

Transfer Agent and Registrar

By:
          Authorized Officer]
<PAGE>

                  Board of Trade of the City of Chicago, Inc.

     Upon request the Corporation will furnish any holder of shares of Class A
Common Stock of the Corporation, without charge, with a full statement of the
powers, designations, preferences, and relative, participating, optional or
other special rights of any class or series of capital stock of the Corporation,
and the qualifications, limitations or restrictions of such preferences and/or
rights.

     For a period of one hundred eighty (180) days following the initial
issuance of the Class A Common Stock represented by this certificate, no share
of Class A Common Stock may be sold, transferred or otherwise disposed of except
(a) by operation of law, (b) in a transaction specifically approved by the Board
of Directors of the Corporation or (c) in a transaction consummated in
connection with and conditioned upon the sale, transfer or disposal of Class B
Common Stock of the Corporation that results in the number of shares of Class A
Common Stock associated with the series of such Class B Common Stock being
simultaneously sold, transferred or disposed of to the same transferee of such
Class B Common Stock in accordance with the Corporation's Amended and Restated
Certificate of Incorporation. Any purported sale, transfer or other disposition
of Class A Common Stock not in accordance with the preceding sentence shall be
void and shall not be recorded on the books of or otherwise recognized by the
Corporation.

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

     TEN COM - as tenants in common
     TEN ENT - as tenants by the entireties
     JT TEN  - as joint tenants with right
               of survivorship and not as
               tenants in common

     UNIF GIFT MIN ACT - ____________ Custodian ____________
                           (Cust.)                (Minor)
                         under Uniform Gifts to Minors Act

                         ___________________________________
                                      (State)

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

For value received, _____________________ hereby sells, assigns and transfers
unto

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

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

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

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

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

-------------------------------------------------------------------------------
Shares of the common stock represented by this Certificate, and does hereby
irrevocably constitute and appoint ____________________________________ Attorney
to transfer the said stock on the books of the Corporation with full power of
substitution in the premises.

Dated ______________________________

In the presence of

X __________________________________   X _______________________________________

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

By __________________________________________________

   THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE
   GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS
   AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH
   MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEED
   MEDALLION PROGRAM), PURSUANT TO SEC RULE 17aD-15.<PAGE>

                         [FORM OF STOCK CERTIFICATE]
                                                                     Exhibit 4.2

                  BOARD OF TRADE OF THE CITY OF CHICAGO, INC.
COMMON SHARES                                                      COMMON SHARES

                  BOARD OF TRADE OF THE CITY OF CHICAGO, INC.
             INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE

CLASS B COMMON STOCK, SERIES B-[_]                   CUSIP:
                                             SEE REVERSE FOR CERTAIN DEFINITIONS

This Certifies that

                                [LOGO OF CBOT]

is the record holder of

    FULLY PAID AND NON-ASSESSABLE SHARES OF CLASS B COMMON STOCK, PAR VALUE
       $0.001 PER SHARE, OF BOARD OF TRADE OF THE CITY OF CHICAGO, INC.

transferable only on the books of the Corporation by the holder hereof in person
or by duly authorized Attorney upon surrender of this Certificate properly
endorsed. [This Certificate is not valid unless countersigned and registered by
the Transfer Agent and Registrar.]

In Witness Whereof the Corporation has caused this Certificate to be executed
and attested to by the manual or facsimile signatures of its duly authorized
officers, under a facsimile of its corporate seal to be affixed hereto.

/s/                               [CBOT Seal]                  /s/
   -------------                                                   -------------
     SECRETARY                                                       PRESIDENT

[COUNTERSIGNED AND REGISTERED:

Transfer Agent and Registrar

By:
          Authorized Officer]
<PAGE>

                  Board of Trade of the City of Chicago, Inc.

     Upon request the Corporation will furnish any holder of shares of class B
Common Stock of the Corporation, without charge, with a full statement of the
powers, designations, preferences, and relative, participating, optional or
other special rights of any class or series of capital stock of the Corporation,
and the qualifications, limitations or restrictions of such preferences and/or
rights.

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

     TEN COM - as tenants in common
     TEN ENT - as tenants by the entireties
     JT TEN  - as joint tenants with right
               of survivorship and not as
               tenants in common

     UNIF GIFT MIN ACT - ____________ Custodian ____________
                           (Cust.)                (Minor)
                         under Uniform Gifts to Minors Act

                         ___________________________________
                                      (State)

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

For value received, _____________________ hereby sells, assigns and transfers
unto

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

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

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

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

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

-------------------------------------------------------------------------------
Shares of the common stock represented by this Certificate, and does hereby
irrevocably constitute and appoint ____________________________________ Attorney
to transfer the said stock on the books of the Corporation with full power of
substitution in the premises.

Dated ______________________________

In the presence of

X __________________________________   X _______________________________________

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

By __________________________________________________

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

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