Exhibit 4.1


 


	
        NUMBER

        C-
	 	SHARES
	 	 	 
	SEE REVERSE FOR CERTAIN DEFINITIONS	 	 
	 	 	 
	 	 	CUSIP 29415C 101


 


EOS ENERGY ENTERPRISES,
INC.


 


COMMON STOCK


 


THIS
CERTIFIES THAT                   is the
owner of                     fully
paid and non-assessable shares of common stock, par value $0.0001 per share (the “Common Stock”), of
Eos Energy Enterprises, Inc., a Delaware corporation (the “Company”), transferable on the books of the
Company in person or by duly authorized attorney upon surrender of this certificate properly endorsed.


 


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


 


Witness the facsimile
signature of a duly authorized signatory of the Company.


 


	 	 	 
	Authorized Signatory	 	Transfer Agent


 




     


     


    

 


EOS ENERGY ENTERPRISES,
INC.


 


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 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 Third 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 Common
Stock represented by the within Certificate, and hereby irrevocably constitutes and appoints


 


Attorney to transfer
the said shares of Common 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:


 


	 	 
	 	 
	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 UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED (OR ANY SUCCESSOR RULE).