Exhibit
4.2 


 


	NUMBER	 	NUMBER
	 	 	C-
	 	 	SHARES
	 	 	SEE
    REVERSE FOR CERTAIN DEFINITIONS
	 	 	CUSIP
    88605T 100


 


THUNDER
BRIDGE CAPITAL PARTNERS III INC.


 


INCORPORATED
UNDER THE LAWS OF THE STATE OF DELAWARE 

CLASS A COMMON STOCK


This
Certifies that


 


is
the owner of


        


FULLY
PAID AND NON-ASSESSABLE SHARES OF THE PAR VALUE OF $0.0001 EACH OF THE CLASS A COMMON STOCK OF


 


THUNDER
BRIDGE CAPITAL PARTNERS III INC.

(THE “COMPANY”)


 


transferable
on the books of the Company in person or by duly authorized attorney upon surrender of this certificate properly endorsed.


 


The
Company will be forced to redeem all of its shares of Class A common stock if it is unable to complete a business combination within
the time period set forth in the Company’s amended and restated certificate of incorporation, as the same may be amended
from time to time, all as more fully described in the Company’s final prospectus dated                        ,
2021.


 


This
certificate is not valid unless countersigned by the Transfer Agent and registered by the Registrar.


 


Witness
the seal of the Company and the facsimile signatures of its duly authorized officers.


 


	Chief
    Executive Officer	[Corporate
    Seal] Delaware	Chief
    Financial Officer
	 	 	 
	 	 	 








 






     

     


    

 


THUNDER
BRIDGE CAPITAL PARTNERS III INC.


 


The
Company will furnish without charge to each stockholder who so requests the powers, designations, preferences and relative, participating,
optional or other special rights of each class of stock or series thereof of the Company and the qualifications, limitations,
or restrictions of such preferences and/or rights. This certificate and the shares represented thereby are issued and shall be
held subject to all the provisions of the Company’s amended and restated certificate of incorporation and all amendments
thereto and resolutions of the Board of Directors providing for the issue of securities (copies of which may be obtained from
the secretary of the Company), to all of which the holder of this certificate by acceptance hereof assents. 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	UNIF
    GIFT MIN ACT	—	 	Custodian	 
	TEN
    ENT	—	as
    tenants by the entireties	 	 	(Cust)	 	(Minor)


  


	JT
    TEN	—	as
    joint tenants with right of survivorship and not as tenants in common	 	 	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(S) OF ASSIGNEE(S))


 


(PLEASE
PRINT OR TYPEWRITE NAME(S) AND ADDRESS(ES), INCLUDING ZIP CODE, OF ASSIGNEE(S))


 


shares
of the capital stock represented by the within Certificate, and hereby irrevocably constitutes and appoints


 


Attorney
to transfer the said stock on the books of the within named Company with full power of substitution in the premises.


 


	Dated:	 
	 


 


	 


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


 


	Signature(s) Guaranteed:	 
	By	 
	 


 


	 


THE
SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS
AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15 (OR ANY
SUCCESSOR RULE).


 


In
each case, as more fully described in the Company’s final prospectus dated                   ,
2021, the holder(s) of this certificate shall be entitled to receive a pro-rata portion of certain funds held in the trust
account established in connection with its initial public offering only in the event that (i) the Company redeems the shares
of Class A common stock sold in the Company’s initial public offering and liquidates because it does not consummate
an initial business combination within the time period set forth in the Corporation’s amended and restated certificate of
incorporation, as the same may be amended from time to time (such date being referred to herein as the “Last Date”),
(ii) the Company redeems the shares of Class A common stock sold in its initial public offering in connection with a
stockholder vote to amend the Company’s amended and restated certificate of incorporation to modify the substance or timing
of the Company’s obligation to allow redemption in connection with its initial business combination or to redeem 100% of
the Class A common stock if it does not consummate an initial business combination by the Last Date, or with respect to any
other provision relating to stockholders’ rights or pre-initial Business Combination activity, or (iii) if the holder(s) seek(s) to
redeem for cash his, her or its respective shares of Class A common stock in connection with a tender offer (or proxy solicitation,
solely in the event the Company seeks stockholder approval of the proposed initial business combination) setting forth the details
of a proposed initial business combination. In no other circumstances shall the holder(s) have any right or interest of any
kind in or to the trust account.