Exhibit 4.1


 


	
        NUMBER

        U-__________
	 	UNITS
	 	 	 
	SEE REVERSE FOR 

CERTAIN DEFINITIONS	ATLANTIC ACQUISITION CORP.	 


 


CUSIP


 


UNITS CONSISTING OF ONE SHARE OF COMMON
STOCK AND


ONE RIGHT TO RECEIVE ONE-TENTH OF A
SHARE OF COMMON STOCK


 


THIS CERTIFIES THAT __________________________________________________________________________



 


is the owner of _____________________________________________________________________________
Units.


 


Each Unit (“Unit”) consists
of one share of common stock, par value $.0001 per share, of Atlantic Acquisition Corp., a Delaware corporation (the “Company”)
and one right. Each right entitles the holder to receive one-tenth (1/10) of a share of common stock upon the Company’s completion
of a merger, share exchange, asset acquisition, stock purchase, recapitalization, reorganization or other similar business combination
with one or more businesses or entities (a “Business Combination”).


 


The terms of the rights are governed
by a rights agreement (the “Rights Agreement”), dated as of [·],
2017, between the Company and American Stock Transfer & Trust Company, LLC, as the rights agent, and are subject to the
terms and provisions contained therein, all of which terms and provisions the holder of this certificate consents to by
acceptance hereof. Copies of the Rights Agreement are on file at the office of the rights agent at 6201 15th
Avenue, Brooklyn, New York, 11219, and are available to any rights holder on written request and without cost.


 


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


 


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


 


This Unit Certificate
shall be governed and construed in accordance with the internal laws of the State of New York, without regard to conflicts of laws
principles thereof.


 


[Corporate Seal]


 


By


 


	 	 	 
	Chairman	 	Secretary


 




    	 	 	 



     


    

 


Atlantic Acquisition Corp. 


 


The Company will furnish
without charge to each stockholder who so requests, a statement of the powers, designations, preferences and relative, participating,
optional or other special rights of each class of shares or series thereof of the Company 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                         UNIF GIFT MIN ACT - _____ Custodian ______
	TEN ENT –	as tenants by the entireties	(Cust)                   (Minor)
	JT TEN –	as joint tenants with right of survivorship	under Uniform Gifts to Minors
	 	and not as tenants in common	Act ______________
	 	 	                (State)


 


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


 


For value received, ___________________________
hereby sell(s), assign(s) and transfer(s) unto


 


PLEASE INSERT SOCIAL SECURITY OR OTHER


IDENTIFYING NUMBER OF ASSIGNEE(S)


 


	
         

         
	 


   


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


 


	 	Units


represented by the within Certificate,
and do hereby irrevocably constitute and appoint


 


	 	Attorney


to transfer the said Units on the books
of the within named Company will full power of substitution in the premises.


 


	Dated 		 


 


	 	Notice:	The signature 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:


 


	 	 


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
GUARANTEE MEDALLION PROGRAM,


PURSUANT TO S.E.C. RULE 17Ad-15).


 


The holder of this certificate shall be entitled to receive
funds with respect to the underlying shares of common stock from the trust fund only in the event of the Company’s liquidation
upon failure to consummate a business combination or if the holder seeks to convert his or her respective shares of common stock
underlying the unit upon consummation of such business combination or in connection with certain amendments to the Company’s
Amended and Restated Certificate of Incorporation. In no other circumstances shall the holder have any right or interest of any
kind in or to the trust fund.