EX-4.2



 Exhibit 4.2 
  

	
	





  
 NUMBER 
FIXX 
SHARES 
SPECIMEN 
COMMON STOCK 
Homology Medicines, Inc. 
INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE 
SEE REVERSE FOR CERTAIN DEFINITIONS 
CUSIP 438083 10 7 
This Certifies That: 
SPECIMEN - NOT NEGOTIABLE 
is the owner of 
FULLY PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK OF THE PAR VALUE OF
$0.0001 PER SHARE OF 
Homology Medicines, Inc. 
transferable 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 and the shares represented hereby are subject to the laws of the State of Delaware, and to the
Certificate of Incorporation and Bylaws of the Corporation, as now or hereafter amended. 
This certificate is not valid until countersigned and registered by the
Transfer Agent and Registrar. 
WITNESS the facsimile seal of the Corporation and the facsimile signatures of its duly authorized officers. 
Dated: 
SPECIMEN not negotiable 
PRESIDENT, CHIEF EXECUTIVE OFFICER 
CHIEF FINANCIAL OFFICER 
COUNTERSIGNED AND REGISTERED: 
AMERICAN STOCK TRANSFER & TRUST COMPANY, LLC 
BROOKLYN, NY 
TRANSFER AGENT AND REGISTRAR 
BY: 
AUTHORIZED SIGNATURE 







 THE CORPORATION WILL FURNISH TO ANY STOCKHOLDER, UPON REQUEST AND WITHOUT CHARGE, A FULL STATEMENT OF THE
DESIGNATIONS, RELATIVE RIGHTS, PREFERENCES AND LIMITATIONS OF THE SHARES OF EACH CLASS AND SERIES AUTHORIZED TO BE ISSUED, SO FAR AS THE SAME HAVE BEEN DETERMINED, AND OF THE AUTHORITY, IF ANY, OF THE BOARD TO DIVIDE THE SHARES INTO CLASSES OR
SERIES AND TO DETERMINE AND CHANGE THE RELATIVE RIGHTS, PREFERENCES AND LIMITATIONS OF ANY CLASS OR SERIES. SUCH REQUEST MAY BE MADE TO THE SECRETARY OF THE CORPORATION OR TO THE TRANSFER AGENT NAMED ON THIS CERTIFICATE. 

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	 		 	under Uniform Gifts to Minors
		 		 	survivorship 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, assign and transfer unto 
  

					
	 PLEASE INSERT SOCIAL SECURITY OR OTHER

IDENTIFYING NUMBER OF ASSIGNEE
	 		 	
	 		
	 	 		 	

  
  

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

 
  
  

 
  

			
	 	 	Shares


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

  

			
	 	 	Attorney


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

 Dated
                                         
                
  

	
	   

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


  

			
	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 SEC Rule 17Ad-15.

  
  

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