Exhibit 4.2


 


SPECIMEN CLASS A COMMON STOCK CERTIFICATE


 


	NUMBER	NUMBER
	 	C-
	 	SHARES
	 	SEE REVERSE FOR CERTAIN DEFINITIONS
	 	CUSIP 048453 104


 


ATLANTIC COASTAL ACQUISITION CORP.


 


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


 


ATLANTIC COASTAL ACQUISITION CORP.

(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 does not complete a business combination by [      
], 2023, 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
	 	 



 






     


     


    

 


ATLANTIC COASTAL ACQUISITION CORP.


 


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 second amended and restated certificate of incorporation and all amendments thereto and resolutions of the
Company’s 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 Class A common 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 UNDER THE SECURITIES EXCHANGE ACT
OF 1934, AS AMENDED).


 


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 by [ ], 2023, (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 second amended and
restated certificate of incorporation (a) 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 [ ], 2023 or (b) with respect to any other provisions 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.