Document:

Exhibit 4.1 

   

  NUMBER UNITS

      U-

   

  SEE REVERSE FOR CERTAIN DEFINITIONS

   

  CUSIP [●]

   

  FORTISTAR SUSTAINABLE SOLUTIONS CORP.

   

  UNITS CONSISTING OF ONE SHARE OF CLASS A COMMON STOCK AND ONE-HALF OF ONE REDEEMABLE
      WARRANT TO PURCHASE ONE SHARE OF CLASS A COMMON STOCK

   

  THIS CERTIFIES THAT                    is the owner of                    Units.

   

  Each Unit (“Unit”) consists of one (1) share of Class A common stock, par value
      $0.0001 per share (“Common Stock”), of Fortistar Sustainable Solutions Corp., a Delaware corporation (the “Company”), and one-half (1/2) of one redeemable warrant (each whole warrant, a “Warrant”). Each whole
      Warrant entitles the holder to purchase one (1) share (subject to adjustment) of Common Stock for $11.50 per share (subject to adjustment). Each Warrant will become exercisable on the later of (i) thirty (30) days after the Company’s completion of a
      merger, capital stock exchange, asset acquisition, stock purchase, reorganization or other similar business combination with one or more businesses (each a “Business Combination”), or (ii) twelve (12) months from the closing of the
      Company’s initial public offering, and will expire unless exercised before 5:00 p.m., New York City Time, on the date that is five (5) years after the date on which the Company completes its initial Business Combination, or earlier upon redemption or
      liquidation (the “Expiration Date”). The Common Stock and Warrants comprising the Units represented by this certificate are not transferable separately prior to              , 2022, unless Credit Suisse Securities (USA) LLC and BofA
      Securities, Inc. elect to allow separate trading earlier, subject to the Company’s filing of a Current Report on Form 8-K with the Securities and Exchange Commission containing an audited balance sheet reflecting the Company’s receipt of the gross
      proceeds of its initial public offering and issuing a press release announcing when separate trading will begin. No fractional warrants will be issued upon separation of the Units. The terms of the Warrants are governed by a Warrant Agreement, dated
      as of               , 2021, between the Company and Continental Stock Transfer & Trust Company, as Warrant 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 Warrant Agreement are on file at the office of the Warrant Agent at 1 State Street, 30th Floor, New York, New York 10004, and are available to any Warrant holder on written request and without cost.

   

  Upon the consummation of the Business Combination, the Units represented by this certificate
      will automatically separate into shares of Common Stock and Warrants comprising such Units.

   

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

   

  This certificate shall be governed by and construed in accordance with the internal laws of
      the State of New York.

   

  Witness the facsimile signature of its duly authorized officers.

   

  	
          Co-President and Secretary

           

        	 	
          Chief Financial Officer

           

        

  FORTISTAR SUSTAINABLE SOLUTIONS CORP.

   

  The Company will furnish without charge to each unitholder 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. 

    

   

  

  
    
      

  

   

  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 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)

   

  

  
  
     

  

  
   

  

  
  
     

  

  
  

   

                                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 with 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) 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 Common Stock sold in its initial public offering and liquidates because it does not consummate an initial business combination by the date set forth in the Company’s amended and restated certificate of incorporation,
      (ii) the Company redeems the shares of 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 (A) to modify the substance or timing of the
      Company’s obligation to allow redemption in connection with the Company’s initial business combination or to redeem 100% of the Common Stock if it does not consummate an initial business combination by the date set forth in the Company’s amended and
      restated certificate of incorporation or (B) with respect to any other provision relating to the rights of holders of the Common stock 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 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.

   

   2Exhibit 4.2

   

  

  NUMBER

  C-

   

  	 	SHARES
	 	SEE REVERSE FOR 

          CERTAIN DEFINITIONS
	 	CUSIP [●]

   

  FORTISTAR SUSTAINABLE SOLUTIONS 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

   

  FORTISTAR SUSTAINABLE SOLUTIONS CORP.

      (THE “CORPORATION”)

   

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

   

  The Corporation will be forced to redeem all of its shares of Class A common stock if it is unable to complete a
      business combination by the date set forth in the Corporation’s amended and restated certificate of incorporation, all as more fully described in the Corporation’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 Corporation and the facsimile signatures of its duly authorized officers.

   

  	
          
            Co-President and Secretary

             

             

              

          

        	[Corporate Seal]

            Delaware	
          Co-President

           

            

        

   

  FORTISTAR SUSTAINABLE SOLUTIONS CORP.

   

  The Corporation 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 Corporation 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 Corporation’s amended and restated certificate of incorporation and all amendments thereto and resolutions of the Corporation’s Board of Directors providing
      for the issue of securities (copies of which may be obtained from the secretary of the Corporation), 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 do hereby irrevocably
      constitutes and appoints

    

  

  
  
     

  

  
  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 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 Corporation’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 Corporation redeems the shares of Class
      A common stock sold in its initial public offering and liquidates because it does not consummate an initial business combination by the date set forth in the Corporation’s amended and restated certificate of incorporation, (ii) the Corporation
      redeems the shares of Class A common stock sold in its initial public offering in connection with a stockholder vote to amend the Corporation’s amended and restated certificate of incorporation (A) to modify the substance or timing of the
      Corporation’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 date set forth in the Corporation’s
      amended and restated certificate of incorporation or (B) with respect to any other provision relating to the rights of holders of the Class A common stock 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 Corporation 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.

   

    

  2

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