Document:

Exhibit 10.5

    

    

     Fortistar Sustainable Solutions Corp.

    One North Lexington Avenue

    White Plains, NY 10601

    

    

    August 31, 2020

    

    

    FSSC Sponsor LLC

    One North Lexington Avenue

    Suite 1450

    White Plains, NY 10601

    

    

    RE:          Securities Subscription Agreement

    

    

    Ladies and Gentlemen:

    

    

    Fortistar Sustainable Solutions Corp., a Delaware corporation (the “Company”), is pleased to accept the offer FSSC Sponsor LLC, a Delaware limited liability company (the “Subscriber” or “you”), has made to purchase 5,750,000  shares of the Company’s Class B common stock (the “Shares”), $0.0001 par value
      per share (the “Class B Common Stock”), up to 750,000 of which are subject to complete or partial forfeiture by you if the underwriters of the Company’s initial public offering (“IPO”), if any, do not fully exercise their over-allotment option (the “Over-allotment Option”).  For the purposes of this Agreement, references to “Common Stock”
      are to, collectively, the Class B Common Stock and the Company’s Class A common stock, $0.0001 par value per share (the “Class A Common Stock”).  Pursuant to the Company’s certificate of incorporation, as
      amended to the date hereof (the “Charter”), shares of Class B Common Stock will convert into shares of Class A Common Stock on a one-for-one basis, subject to adjustment, upon the terms and conditions sets
      forth in the Charter. Unless the context otherwise requires, as used herein “Securities” shall refer to the Shares and shall be deemed to include any shares of Class A Common Stock issued upon conversion of the
      Shares. The terms (this “Agreement”) on which the Company is willing to sell the Shares to the Subscriber, and the Company and the Subscriber’s agreements regarding such Shares, are as follows:

    

    

    1.          Purchase of Shares.

    

    

    For the sum of $25,000 (the “Purchase Price”), which the Company acknowledges receiving in cash, the Company hereby sells and issues the Shares to the Subscriber, and the
      Subscriber hereby purchases the Shares from the Company, subject to forfeiture, on the terms and subject to the conditions set forth in this Agreement.  Concurrently with the Subscriber’s execution of this Agreement, the Company shall, at its option,
      deliver to the Subscriber a certificate registered in the Subscriber’s name representing the Shares (the “Original Certificate”), or effect such delivery in book-entry form.

    
      
        

    

    2.          Representations, Warranties and Agreements.

    

    

    2.1          Subscriber’s Representations, Warranties and Agreements.  To induce the Company to issue the Securities to the Subscriber, the Subscriber hereby represents and warrants to the Company and agrees with
      the Company as follows:

    

    

    2.1.1          No Government Recommendation or Approval.  The Subscriber understands that no federal or state agency has passed upon or made any recommendation or endorsement of the offering of
      the Securities.

    

    2.1.2          No Conflicts.  The execution, delivery and performance of this Agreement and the consummation by the Subscriber of the transactions contemplated hereby do not violate, conflict
      with or constitute a default under (i) the formation and governing documents of the Subscriber, (ii) any agreement, indenture or instrument to which the Subscriber is a party or (iii) any law, statute, rule or regulation to which the Subscriber is
      subject, or any agreement, order, judgment or decree to which the Subscriber is subject.

    

    

    2.1.3          Organization and Authority.  The Subscriber is a Delaware limited liability company, validly existing and in good standing under the laws of Delaware and possesses all requisite
      power and authority necessary to carry out the transactions contemplated by this Agreement.  Upon execution and delivery by you, this Agreement is a legal, valid and binding agreement of the Subscriber, enforceable against the Subscriber in
      accordance with its terms, except as such enforceability may be limited by applicable bankruptcy, insolvency, fraudulent conveyance or similar laws affecting the enforcement of creditors’ rights generally and subject to general principles of equity
      (regardless of whether enforcement is sought in a proceeding at law or in equity).

    

    

    2.1.4          Experience, Financial Capability and Suitability.  The Subscriber is: (i) sophisticated in financial matters and is able to evaluate the risks and benefits of the investment in
      the Securities and (ii) able to bear the economic risk of its investment in the Securities for an indefinite period of time because the Securities have not been registered under the Securities Act (as defined below) and therefore cannot be sold
      unless subsequently registered under the Securities Act or an exemption from such registration is available.  The Subscriber is capable of evaluating the merits and risks of its investment in the Company and has the capacity to protect its own
      interests.  The Subscriber must bear the economic risk of this investment until the Securities are sold pursuant to: (i) an effective registration statement under the Securities Act or (ii) an exemption from registration available with respect to
      such sale.  The Subscriber is able to bear the economic risks of an investment in the Securities and to afford a complete loss of the Subscriber’s investment in the Securities.

    

    

    2.1.5          Access to Information; Independent Investigation.  Prior to the execution of this Agreement, the Subscriber has had the opportunity to ask questions of and receive answers from
      representatives of the Company concerning an investment in the Company, as well as the finances, operations, business and prospects of the Company, and the opportunity to obtain additional information to verify the accuracy of all information so
      obtained.  In determining whether to make this investment, the Subscriber has relied solely on the Subscriber’s own knowledge and understanding of the Company and its business based upon the Subscriber’s own due diligence investigation and the
      information furnished pursuant to this paragraph.  The Subscriber understands that no person has been authorized to give any information or to make any representations which were not furnished pursuant to this Section 2 and the Subscriber has not
      relied on any other representations or information in making its investment decision, whether written or oral, relating to the Company, its operations and/or its prospects.

    
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    2.1.6          Regulation D Offering. The Subscriber represents that it is an “accredited investor” as such term is defined in Rule 501(a) of Regulation D under the Securities Act of 1933, as
      amended (the “Securities Act”), and acknowledges the sale contemplated hereby is being made in reliance on a private placement exemption applicable to “accredited investors” within the meaning of Section 501(a)
      of Regulation D under the Securities Act or similar exemptions under state law.

    

    

    2.1.7          Investment Purposes.  The Subscriber is purchasing the Securities solely for investment purposes, for the Subscriber’s own account and not for the account or benefit of any other
      person, and not with a view towards the distribution or dissemination thereof.  The Subscriber did not decide to enter into this Agreement as a result of any general solicitation or general advertising within the meaning of Rule 502 under the
      Securities Act.

    

    

    2.1.8          Restrictions on Transfer; Shell Company.  The Subscriber understands the Securities are being offered in a transaction not involving a public offering within the meaning of the
      Securities Act.  The Subscriber understands the Securities will be “restricted securities” within the meaning of Rule 144(a)(3) under the Securities Act and the Subscriber understands that the certificates or book-entries representing the Securities
      will contain a legend in respect of such restrictions.  If in the future the Subscriber decides to offer, resell, pledge or otherwise transfer the Securities, such Securities may be offered, resold, pledged or otherwise transferred only pursuant to:
      (i) registration under the Securities Act, or (ii) an available exemption from registration.  The Subscriber agrees that if any transfer of its Securities or any interest therein is proposed to be made, as a condition precedent to any such transfer,
      the Subscriber may be required to deliver to the Company an opinion of counsel satisfactory to the Company.  Absent registration or an exemption, the Subscriber agrees not to resell the Securities.  The Subscriber further acknowledges that because
      the Company is a shell company, Rule 144 may not be available to the Subscriber for the resale of the Securities until at least one year following consummation of the initial business combination of the Company, despite technical compliance with the
      requirements of Rule 144 and the release or waiver of any contractual transfer restrictions.

    

    

    2.1.9          No Governmental Consents.  No governmental, administrative or other third party consents or approvals are required, necessary or appropriate on the part of the Subscriber in
      connection with the transactions contemplated by this Agreement.

    

    

    2.2          Company’s Representations, Warranties and Agreements.  To induce the Subscriber to purchase the Securities, the Company hereby represents and warrants to the Subscriber and agrees with the Subscriber
      as follows:

    

    

    2.2.1          Organization and Corporate Power.  The Company is a Delaware corporation and is qualified to do business in every jurisdiction in which the failure to so qualify would reasonably
      be expected to have a material adverse effect on the financial condition, operating results or assets of the Company.  The Company possesses all requisite corporate power and authority necessary to carry out the transactions contemplated by this
      Agreement.

    
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    2.2.2          No Conflicts.  The execution, delivery and performance of this Agreement and the consummation by the Company of the transactions contemplated hereby do not violate, conflict with
      or constitute a default under (i) the Charter or bylaws of the Company, (ii) any agreement, indenture or instrument to which the Company is a party or (iii) any law, statute, rule or regulation to which the Company is subject, or any agreement,
      order, judgment or decree to which the Company is subject.

    

    

    2.2.3          Title to Securities.  Upon issuance in accordance with, and payment pursuant to, the terms hereof and the Charter, the Securities will be duly and validly issued, fully paid and
      nonassessable.  Upon issuance in accordance with, and payment pursuant to, the terms hereof and the Charter, the Subscriber will have or receive good title to the Securities, free and clear of all liens, claims and encumbrances of any kind, other
      than (a) transfer restrictions hereunder and under the other agreements to which the Securities may be subject, (b) transfer restrictions under federal and state securities laws, and (c) liens, claims or encumbrances imposed due to the actions of the
      Subscriber.

    

    

    2.2.4          No Adverse Actions.  There are no actions, suits, investigations or proceedings pending, threatened against or affecting the Company which: (i) seek to restrain, enjoin, prevent
      the consummation of or otherwise affect the transactions contemplated by this Agreement or (ii) question the validity or legality of any transactions or seeks to recover damages or to obtain other relief in connection with any transactions.

    

    

    2.2.5          Authorization. The shares of Class A Common Stock issuable upon conversion of the Shares have been duly authorized and reserved for issuance upon such conversion.

    

    

    3.          Forfeiture of Shares.

    

    

    3.1          Partial or No Exercise of the Over-allotment Option.  In the event the Over-allotment Option granted to the underwriters of the IPO is not exercised in full, the Subscriber acknowledges and agrees
      that it (or, if applicable, it and any transferees of Shares) shall forfeit any and all rights to such number of Shares (up to an aggregate of 750,000 Shares and pro rata based upon the percentage of the Over-allotment Option exercised) such that
      immediately following such forfeiture, the Subscriber (and any such transferees) will own an aggregate number of Shares equal to 20% of the issued and outstanding Common Stock immediately following the IPO.

    

    

    3.2          Termination of Rights as Stockholder.  If any of the Shares are forfeited in accordance with this Section 3, then after such time the Subscriber (or successor in interest), shall no longer have any
      rights as a holder of such forfeited Shares, and the Company shall take such action as is appropriate to cancel such forfeited Shares.

    
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    3.3          Share Certificates.  In the event an adjustment to the Original Certificates, if any, is required pursuant to this Section 3, then the Subscriber shall return such Original Certificates to the Company
      or its designated agent as soon as practicable upon its receipt of notice from the Company advising the Subscriber of such adjustment, following which a new certificate (the “New Certificate”), if any, shall be
      issued in such amount representing the adjusted number of Shares held by the Subscriber.  The New Certificate, if any, shall be returned to the Subscriber as soon as practicable.  Any such adjustment for any uncertificated securities held by the
      Subscriber shall be made in book-entry form.

    

    

    4.          Waiver of Liquidation Distributions; Redemption Rights.  In connection with the Shares purchased pursuant to this Agreement, the Subscriber hereby waives any and all right, title, interest or claim of
      any kind in or to any distributions by the Company from the trust account which will be established for the benefit of the Company’s public stockholders and into which substantially all of the proceeds of the IPO will be deposited (the “Trust Account”), in the event of a liquidation of the Company upon the Company’s failure to timely complete an initial business combination.  For purposes of clarity, in the event the Subscriber purchases
      securities in the IPO or in the aftermarket, any Class A Common Stock so purchased shall be eligible to receive any liquidating distributions by the Company.  However, in no event will the Subscriber have the right to redeem any shares of Common
      Stock held by it into funds held in the Trust Account upon the successful completion of an initial business combination.

    

    

    5.          Restrictions on Transfer.

    

    

    5.1          Securities Law Restrictions.  In addition to any restrictions to be contained in that certain letter agreement (commonly known as an “Insider Letter”) dated on
      or prior to the closing of the IPO by and between the Subscriber and the Company, the Subscriber agrees not to sell, transfer, pledge, hypothecate or otherwise dispose of all or any part of the Securities unless, prior thereto (a) a registration
      statement on the appropriate form under the Securities Act and applicable state securities laws with respect to the Securities proposed to be transferred shall then be effective or (b) the Company has received an opinion from counsel reasonably
      satisfactory to the Company, that such registration is not required because such transaction is exempt from registration under the Securities Act and the rules promulgated by the Securities and Exchange Commission thereunder and with all applicable
      state securities laws.

    

    

    5.2          Lock-up.  The Subscriber acknowledges that the Securities will be subject to lock-up provisions (the “Lock-up”) contained in the Insider Letter.

    

    

    5.3          Restrictive Legends.  All certificates representing the Securities shall have endorsed thereon legends substantially as follows:

    

    

    “THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR ANY STATE SECURITIES LAWS AND NEITHER THE SECURITIES NOR ANY INTEREST THEREIN MAY BE
      OFFERED, SOLD, TRANSFERRED, PLEDGED OR OTHERWISE DISPOSED OF EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER SUCH ACT OR SUCH LAWS OR AN EXEMPTION FROM REGISTRATION UNDER SUCH ACT AND SUCH LAWS WHICH, IN THE OPINION OF COUNSEL (IF THE
      COMPANY SO REQUESTS), IS AVAILABLE.”

    

    

    “THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO A LOCKUP AND MAY NOT BE OFFERED, SOLD, TRANSFERRED, PLEDGED OR OTHERWISE DISPOSED DURING THE TERM OF THE LOCKUP.”

    
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    5.4          Additional Shares or Substituted Securities.  In the event of the declaration of a share dividend, the declaration of an extraordinary dividend payable in a form other than Common Stock, a spin-off, a
      share split, an adjustment in conversion ratio, a recapitalization or a similar transaction affecting the Company’s outstanding Common Stock without receipt of consideration, any new, substituted or additional securities or other property which are
      by reason of such transaction distributed with respect to any Securities subject to this Section 5 or into which such Securities thereby become convertible shall immediately be subject to this Section 5 and Section 3.  Appropriate adjustments to
      reflect the distribution of such securities or property shall be made to the number and/or class of Securities subject to this Section 5 and Section 3.

    

    

    5.5          Registration Rights.  The Subscriber acknowledges that the Shares are being purchased pursuant to an exemption from the registration requirements of the Securities Act and will become freely tradable
      only after certain conditions are met or they are registered pursuant to a registration rights agreement to be entered into with the Company prior to the closing of the IPO (the “Registration Rights Agreement”).

    

    

    6.          Other Agreements.

    

    

    6.1          Further Assurances.  The Subscriber agrees to execute such further instruments and to take such further action as may reasonably be necessary to carry out the intent of this Agreement.

    

    

    6.2          Notices.  All notices, statements or other documents which are required or contemplated by this Agreement shall be: in writing and delivered (i) personally or sent by first class registered or
      certified mail, overnight courier service or facsimile or electronic transmission to the address designated in writing, (ii) by facsimile to the number most recently provided to such party or such other address or fax number as may be designated in
      writing by such party or (iii) by electronic mail, to the electronic mail address most recently provided to such party or such other electronic mail address as may be designated in writing by such party.  Any notice or other communication so
      transmitted shall be deemed to have been given on the day of delivery, if delivered personally, on the business day following receipt of written confirmation, if sent by facsimile or electronic transmission, one (1) business day after delivery to an
      overnight courier service or five (5) days after mailing if sent by mail.

    

    

    6.3          Entire Agreement.  This Agreement, together with the Insider Letter and the Registration Rights Agreement, each substantially in the form to be filed as an exhibit to the Registration Statement,
      embodies the entire agreement and understanding between the Subscriber and the Company with respect to the subject matter hereof and supersedes all prior oral or written agreements and understandings relating to the subject matter hereof.

    

    

    6.4          Modifications and Amendments.  The terms and provisions of this Agreement may be modified or amended only by written agreement executed by all parties hereto.

    
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    6.5          Waivers and Consents.  The terms and provisions of this Agreement may be waived, or consent for the departure therefrom granted, only by written document executed by the party entitled to the benefits
      of such terms or provisions.  No such waiver or consent shall be deemed to be or shall constitute a waiver or consent with respect to any other terms or provisions of this Agreement, whether or not similar.  Each such waiver or consent shall be
      effective only in the specific instance and for the purpose for which it was given, and shall not constitute a continuing waiver or consent.

    

    

    6.6          Assignment.  The rights and obligations under this Agreement may not be assigned by either party hereto without the prior written consent of the other party.

    

    

    6.7          Benefit.  All statements, representations, warranties, covenants and agreements in this Agreement shall be binding on the parties hereto and shall inure to the benefit of the respective successors and
      permitted assigns of each party hereto.  Nothing in this Agreement shall be construed to create any rights or obligations except among the parties hereto, and no person or entity shall be regarded as a third-party beneficiary of this Agreement.

    

    

    6.8          Governing Law.  This Agreement and the rights and obligations of the parties hereunder shall be construed in accordance with and governed by the laws of New York applicable to contracts wholly
      performed within the borders of such state, without giving effect to the conflict of law principles thereof.

    

    

    6.9          Severability.  In the event that any court of competent jurisdiction shall determine that any provision, or any portion thereof, contained in this Agreement shall be unreasonable or unenforceable in
      any respect, then such provision shall be deemed limited to the extent that such court deems it reasonable and enforceable, and as so limited shall remain in full force and effect.  In the event that such court shall deem any such provision, or
      portion thereof, wholly unenforceable, the remaining provisions of this Agreement shall nevertheless remain in full force and effect.

    

    

    6.10          No Waiver of Rights, Powers and Remedies.  No failure or delay by a party hereto in exercising any right, power or remedy under this Agreement, and no course of dealing between the parties hereto,
      shall operate as a waiver of any such right, power or remedy of such party.  No single or partial exercise of any right, power or remedy under this Agreement by a party hereto, nor any abandonment or discontinuance of steps to enforce any such right,
      power or remedy, shall preclude such party from any other or further exercise thereof or the exercise of any other right, power or remedy hereunder.  The election of any remedy by a party hereto shall not constitute a waiver of the right of such
      party to pursue other available remedies.  No notice to or demand on a party not expressly required under this Agreement shall entitle the party receiving such notice or demand to any other or further notice or demand in similar or other
      circumstances or constitute a waiver of the rights of the party giving such notice or demand to any other or further action in any circumstances without such notice or demand.

    

    

    6.11          Survival of Representations and Warranties.  All representations and warranties made by the parties hereto in this Agreement or in any other agreement, certificate or instrument provided for or
      contemplated hereby, shall survive the execution and delivery hereof and any investigations made by or on behalf of the parties.

    
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    6.12          No Broker or Finder.  Each of the parties hereto represents and warrants to the other that no broker, finder or other financial consultant has acted on its behalf in connection with this Agreement or
      the transactions contemplated hereby in such a way as to create any liability on the other.  Each of the parties hereto agrees to indemnify and save the other harmless from any claim or demand for commission or other compensation by any broker,
      finder, financial consultant or similar agent claiming to have been employed by or on behalf of such party and to bear the cost of legal expenses incurred in defending against any such claim.

    

    

    6.13          Headings and Captions.  The headings and captions of the various subdivisions of this Agreement are for convenience of reference only and shall in no way modify or affect the meaning or construction
      of any of the terms or provisions hereof.

    

    

    6.14          Counterparts.  This Agreement may be executed in one or more counterparts, all of which when taken together shall be considered one and the same agreement and shall become effective when counterparts
      have been signed by each party and delivered to the other party, it being understood that both parties need not sign the same counterpart.  In the event that any signature is delivered by facsimile transmission or any other form of electronic
      delivery, such signature shall create a valid and binding obligation of the party executing (or on whose behalf such signature is executed) with the same force and effect as if such signature page were an original thereof.

    

    

    6.15          Construction.  The parties hereto have participated jointly in the negotiation and drafting of this Agreement.  If an ambiguity or question of intent or interpretation arises, this Agreement will be
      construed as if drafted jointly by the parties hereto and no presumption or burden of proof will arise favoring or disfavoring any party hereto because of the authorship of any provision of this Agreement.  The words “include,” “includes,” and “including” will be deemed to be followed by “without limitation.”  Pronouns in
      masculine, feminine, and neuter genders will be construed to include any other gender, and words in the singular form will be construed to include the plural and vice versa, unless the context otherwise requires.  The words “this Agreement,” “herein,” “hereof,” “hereby,” “hereunder,” and
      words of similar import refer to this Agreement as a whole and not to any particular subdivision unless expressly so limited.  The parties hereto intend that each representation, warranty, and covenant contained herein will have independent
      significance.  If any party hereto has breached any representation, warranty, or covenant contained herein in any respect, the fact that there exists another representation, warranty or covenant relating to the same subject matter (regardless of the
      relative levels of specificity) which such party hereto has not breached will not detract from or mitigate the fact that such party hereto is in breach of the first representation, warranty, or covenant.

    

    

    6.16          Mutual Drafting.  This Agreement is the joint product of the Subscriber and the Company and each provision hereof has been subject to the mutual consultation, negotiation and agreement of such
      parties and shall not be construed for or against any party hereto.

    

    

    7.          Voting and Tender of Shares.  The Subscriber agrees to vote the Shares in favor of an initial business combination that the Company negotiates and submits for approval to the Company’s stockholders and
      shall not seek redemption with respect to any of the Shares.  Additionally, the Subscriber agrees not to tender any Shares in connection with a tender offer presented to the Company’s stockholders in connection with an initial business combination
      negotiated by the Company.

    

    

    8.          Indemnification.  Each party shall indemnify the other against any loss, cost or damages (including reasonable attorney’s fees and expenses) incurred as a result of such party’s breach of any
      representation, warranty, covenant or agreement in this Agreement.

    

    

    [Signature Page Follows]

    
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    If the foregoing accurately sets forth our understanding and agreement, please sign the enclosed copy of the Agreement and return it to us.

    

    

    	 	
            Very truly yours,

          
	 	 
	 	
            FORTISTAR SUSTAINABLE SOLUTIONS CORP.

          
	 	 
	 	
            By:

          	
            /s/ Nadeem Nisar

          
	 	
            Name:

          	
            Nadeem Nisar

          
	 	
            Title:

          	
            Chief Executive Officer

          

    

    

    FSSC SPONSOR LLC

    

    

    
      	
              By:

            	
              /s/ Scott Contino

            	 
	
              Name:

            	
              Scott Contino

            	 
	
              Title:

            	
              Chief Financial Officer

            	 

    

    

    

    [Signature page to Subscription Agreement]Exhibit 10.6

   

  PRIVATE PLACEMENT WARRANTS PURCHASE AGREEMENT

   

  THIS PRIVATE PLACEMENT WARRANTS PURCHASE AGREEMENT, effective as of [●], 2021 (as it may from time to time be amended, this “Agreement”), is
    entered into by and between Fortistar Sustainable Solutions Corp., a Delaware corporation (the “Company”), and FSSC Sponsor LLC, a Delaware limited liability company (the “Purchaser”).

   

  WHEREAS:

   

  The Company intends to consummate an initial public offering of the Company’s units (the “Public Offering”), each unit consisting of one share
    of the Company’s Class A common stock, par value $0.0001 per share (each, a “Share”), and one-half of one redeemable warrant as set forth in the Company’s registration statement on Form S-1, filed with the Securities and Exchange Commission (the
    “SEC”), File Number 333-[●] (the “Registration Statement”), under the Securities Act of 1933, as amended (the “Securities Act”);

   

  Each whole warrant entitles the holder to purchase one Share at an exercise price of $11.50 per Share; and

   

  The Purchaser has agreed to purchase an aggregate of 6,000,000 redeemable warrants (or up to 6,600,000 redeemable warrants if the over-allotment option
    in connection with the Public Offering is exercised in full) (the “Private Placement Warrants”), each whole Private Placement Warrant entitling the holder to purchase one Share at an exercise price of $11.50 per Share.

   

  NOW THEREFORE, in consideration of the mutual promises contained in this Agreement and other good and valuable consideration, the receipt and
    sufficiency of which are hereby acknowledged, the parties to this Agreement hereby, intending legally to be bound, agree as follows:

   

  AGREEMENT

   

  Section 1. Authorization, Purchase and Sale; Terms of the Private Placement Warrants.

   

  A. Authorization of the Private Placement Warrants. The Company has duly authorized the issuance and sale of the Private Placement Warrants
    to the Purchaser.

   

  B. Purchase and Sale of the Private Placement Warrants.

   

  (i) On the date of the consummation of the Public Offering or on such earlier time and date as may be mutually agreed by the Purchaser and the
    Company (the “Initial Closing Date”), the Company shall issue and sell to the Purchaser, and the Purchaser shall purchase from the Company, 6,000,000 Private Placement Warrants at a price of $1.00 per warrant for an aggregate purchase price of
    $6,000,000 (the “Purchase Price”), which shall be paid by wire transfer of immediately available funds to the Company at least one day prior to the Initial Closing Date in accordance with the Company’s wiring instructions; provided, however,
    that the Purchase Price shall be reimbursed to the Purchaser if the Initial Closing Date does not occur on the day following such wire payment. On the Initial Closing Date, following the payment by the Purchaser of the Purchase Price by wire transfer
    of immediately available funds to the Company, the Company, at its option, shall deliver a certificate evidencing the Private Placement Warrants purchased on such date duly registered in the Purchaser’s name to the Purchaser, or effect such delivery in
    book-entry form.

   

   

  

  
    
      

  

  
   

  (ii) On the date of the consummation of each closing (if any) of the over-allotment option in connection with the Public Offering or on such
    earlier time and date as may be mutually agreed by the Purchaser and the Company (each such date, an “Over-allotment Closing Date”, and, each Over-allotment Closing Date (if any) together with the Initial Closing Date, being sometimes referred
    to herein as a “Closing Date”), the Company shall issue and sell to the Purchaser, and the Purchaser shall purchase from the Company, an aggregate of up to 600,000 Private Placement Warrants, in the same proportion as the amount of the
    over-allotment option that is then so exercised, at a price of $1.00 per warrant for an aggregate purchase price of up to $600,000 (if the over-allotment option in connection with the Public Offering is exercised in full) (the “Over-allotment
      Purchase Price”), which shall be paid by wire transfer of immediately available funds to the Company at least one day prior to such Over-allotment Closing Date in accordance with the Company’s wiring instructions; provided, however, that the
    Over-allotment Purchase Price shall be reimbursed to the Purchaser if such Over-allotment Closing Date does not occur on the day following such wire payment. On the Over-allotment Closing Date, following the payment by the Purchaser of the
    Over-allotment Purchase Price by wire transfer of immediately available funds to the Company, the Company shall, at its option, deliver a certificate evidencing the Private Placement Warrants purchased on such date duly registered in the Purchaser’s
    name to the Purchaser, or effect such delivery in book-entry form.

   

  C. Terms of the Private Placement Warrants.

   

  (i) Each Private Placement Warrant shall have the terms set forth in a Warrant Agreement to be entered into by the Company and a warrant agent, in
    connection with the Public Offering (the “Warrant Agreement”).

   

  (ii) At the time of the closing of the Public Offering, the Company and the Purchaser shall enter into a registration rights agreement (the “Registration

      Rights Agreement”) pursuant to which the Company will grant certain registration rights to the Purchaser relating to the Private Placement Warrants and the Shares underlying the Private Placement Warrants.

   

  Section 2. Representations and Warranties of the Company. As a material inducement to the Purchaser to enter into this Agreement and purchase
    the Private Placement Warrants, the Company hereby represents and warrants to the Purchaser (which representations and warranties shall survive each Closing Date) that:

   

  A. Organization and Corporate Power. The Company is a corporation duly incorporated, validly existing and in good standing under the laws of
    the State of Delaware and is qualified to do business in every jurisdiction in which the failure to so qualify would reasonably be expected to have a material adverse effect on the financial condition, operating results or assets of the Company. The
    Company possesses all requisite corporate power and authority necessary to carry out the transactions contemplated by this Agreement and the Warrant Agreement.

   

   

  

  
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  B. Authorization; No Breach.

   

  (i) The execution, delivery and performance of this Agreement and the Private Placement Warrants have been duly authorized by the Company as of the
    Closing Date. This Agreement constitutes the valid and binding obligation of the Company, enforceable in accordance with its terms. Upon issuance in accordance with, and payment pursuant to, the terms of the Warrant Agreement and this Agreement, the
    Private Placement Warrants will constitute valid and binding obligations of the Company, enforceable in accordance with their terms as of each Closing Date.

   

  (ii) The execution and delivery by the Company of this Agreement and the Private Placement Warrants, the issuance and sale of the Private Placement
    Warrants, the issuance of the Shares upon exercise of the Private Placement Warrants and the fulfillment of, and compliance with, the respective terms hereof and thereof by the Company, do not and will not as of each Closing Date (a) conflict with or
    result in a breach of the terms, conditions or provisions of, (b) constitute a default under, (c) result in the creation of any lien, security interest, charge or encumbrance upon the Company’s capital stock or assets under, (d) result in a violation
    of, or (e) require any authorization, consent, approval, exemption or other action by or notice or declaration to, or filing with, any court or administrative or governmental body or agency pursuant to the certificate of incorporation of the Company or
    the Bylaws of the Company (in effect on the date hereof or as may be amended prior to completion of the contemplated Public Offering), or any material law, statute, rule or regulation to which the Company is subject, or any agreement, order, judgment
    or decree to which the Company is subject, except for any filings required after the date hereof under federal or state securities laws.

   

  C. Title to Securities. Upon issuance in accordance with, and payment pursuant to, the terms hereof and the Warrant Agreement, the Shares
    issuable upon exercise of the Private Placement Warrants will be duly and validly issued, fully paid and nonassessable. Upon issuance in accordance with, and payment pursuant to, the terms hereof and the Warrant Agreement, the Purchaser will have good
    title to the Private Placement Warrants and the Shares issuable upon exercise of such Private Placement Warrants, free and clear of all liens, claims and encumbrances of any kind, other than (i) transfer restrictions hereunder and under the other
    agreements contemplated hereby, (ii) transfer restrictions under federal and state securities laws, and (iii) liens, claims or encumbrances imposed due to the actions of the Purchaser.

   

  D. Governmental Consents. No permit, consent, approval or authorization of, or declaration to or filing with, any governmental authority is
    required in connection with the execution, delivery and performance by the Company of this Agreement or the consummation by the Company of any other transactions contemplated hereby.

   

  Section 3. Representations and Warranties of the Purchaser. As a material inducement to the Company to enter into this Agreement and issue and
    sell the Private Placement Warrants to the Purchaser, the Purchaser hereby represents and warrants to the Company (which representations and warranties shall survive each Closing Date) that:

   

  A. Organization and Requisite Authority. The Purchaser possesses all requisite power and authority necessary to carry out the transactions
    contemplated by this Agreement.

   

   

  

  
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  B. Authorization; No Breach.

   

  (i) This Agreement constitutes a valid and binding obligation of the Purchaser, enforceable in accordance with its terms, subject to bankruptcy,
    insolvency, fraudulent conveyance, reorganization, moratorium and other laws of general applicability relating to or affecting creditors’ rights and to general equitable principles (whether considered in a proceeding in equity or law).

   

  (ii) The execution and delivery by the Purchaser of this Agreement and the fulfillment of and compliance with the terms hereof by the Purchaser does
    not and shall not as of each Closing Date conflict with or result in a breach by the Purchaser of the terms, conditions or provisions of any agreement, instrument, order, judgment or decree to which the Purchaser is subject.

   

  C. Investment Representations.

   

  (i) The Purchaser is acquiring the Private Placement Warrants and, upon exercise of the Private Placement Warrants, the Shares issuable upon such
    exercise (collectively, the “Securities”), for the Purchaser’s own account, for investment purposes only and not with a view towards, or for resale in connection with, any public sale or distribution thereof.

   

  (ii) The Purchaser is an “accredited investor” as such term is defined in Rule 501(a)(3) of Regulation D under the Securities Act.

   

  (iii) The Purchaser understands that the Securities are being offered and will be sold to it in reliance on specific exemptions from the registration
    requirements of the United States federal and state securities laws and that the Company is relying upon the truth and accuracy of, and the Purchaser’s compliance with, the representations and warranties of the Purchaser set forth herein in order to
    determine the availability of such exemptions and the eligibility of the Purchaser to acquire such Securities.

   

  (iv) The Purchaser did not decide to enter into this Agreement as a result of any general solicitation or general advertising within the meaning of
    Rule 502(c) under the Securities Act.

   

  (v) The Purchaser has been furnished with all materials relating to the business, finances and operations of the Company and materials relating to
    the offer and sale of the Securities which have been requested by the Purchaser. The Purchaser has been afforded the opportunity to ask questions of the executive officers and directors of the Company. The Purchaser understands that its investment in
    the Securities involves a high degree of risk and it has sought such accounting, legal and tax advice as it has considered necessary to make an informed investment decision with respect to the acquisition of the Securities.

   

  (vi) The Purchaser understands that no United States federal or state agency or any other government or governmental agency has passed on or made any
    recommendation or endorsement of the Securities or the fairness or suitability of the investment in the Securities by the Purchaser nor have such authorities passed upon or endorsed the merits of the offering of the Securities.

   

   

  

  
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  (vii) The Purchaser understands that: (a) the Securities have not been and are not being registered under the Securities Act or any state securities
    laws, and may not be offered for sale, sold, assigned or transferred unless (1) subsequently registered thereunder or (2) sold in reliance on an exemption therefrom; and (b) except as specifically set forth in the Registration Rights Agreement, neither
    the Company nor any other person is under any obligation to register the Securities under the Securities Act or any state securities laws or to comply with the terms and conditions of any exemption thereunder. In this regard, the Purchaser understands
    that the SEC has taken the position that promoters or affiliates of a blank check company and their transferees, both before and after a Business Combination, are deemed to be “underwriters” under the Securities Act when reselling the securities of a
    blank check company. Based on that position, Rule 144 adopted pursuant to the Securities Act would not be available for resale transactions of the Securities despite technical compliance with the requirements of such Rule, and the Securities can be
    resold only through a registered offering or in reliance upon another exemption from the registration requirements of the Securities Act.

   

  (viii) The Purchaser has such knowledge and experience in financial and business matters, knowledge of the high degree of risk associated with
    investments in the securities of companies in the development stage such as the Company, is capable of evaluating the merits and risks of an investment in the Securities and is able to bear the economic risk of an investment in the Securities in the
    amount contemplated hereunder for an indefinite period of time. The Purchaser has adequate means of providing for its current financial needs and contingencies and will have no current or anticipated future needs for liquidity which would be
    jeopardized by the investment in the Securities. The Purchaser can afford a complete loss of its investment in the Securities.

   

  (ix) The Purchaser understands that the Private Placement Warrants shall bear the legend substantially in the form set forth in the Warrant
    Agreement.

   

  Section 4. Conditions of the Purchaser’s Obligations. The obligations of the Purchaser to purchase and pay for the Private Placement Warrants
    are subject to the fulfillment, on or before each Closing Date, of each of the following conditions:

   

  A. Representations and Warranties. The representations and warranties of the Company contained in Section 2 shall be true and correct at and
    as of such Closing Date as though then made.

   

  B. Performance. The Company shall have performed and complied with all agreements, obligations and conditions contained in this Agreement
    that are required to be performed or complied with by it on or before such Closing Date.

   

  C. No Injunction. No litigation, statute, rule, regulation, executive order, decree, ruling or injunction shall have been enacted, entered,
    promulgated or endorsed by or in any court or governmental authority of competent jurisdiction or any self-regulatory organization having authority over the matters contemplated hereby, which prohibits the consummation of any of the transactions
    contemplated by this Agreement or the Warrant Agreement.

   

  D. Warrant Agreement. The Company shall have entered into a Warrant Agreement with a warrant agent on terms satisfactory to the Purchaser.

   

  Section 5. Conditions of the Company’s Obligations. The obligations of the Company to the Purchaser under this Agreement are subject to the
    fulfillment, on or before each Closing Date, of each of the following conditions:

   

  A. Representations and Warranties. The representations and warranties of the Purchaser contained in Section 3 shall be true and correct at
    and as of such Closing Date as though then made.

   

   

  

  
    5

    
      

  

   

  B. Performance. The Purchaser shall have performed and complied with all agreements, obligations and conditions contained in this Agreement
    that are required to be performed or complied with by the Purchaser on or before such Closing Date.

   

  C. No Injunction. No litigation, statute, rule, regulation, executive order, decree, ruling or injunction shall have been enacted, entered,
    promulgated or endorsed by or in any court or governmental authority of competent jurisdiction or any self-regulatory organization having authority over the matters contemplated hereby, which prohibits the consummation of any of the transactions
    contemplated by this Agreement or the Warrant Agreement.

   

  D. Warrant Agreement. The Company shall have entered into a Warrant Agreement with a warrant agent on terms satisfactory to the Company.

   

  Section 6. Termination. This Agreement may be terminated at any time after [●], 2021 upon the election by either the Company or the Purchaser
    upon written notice to the other party if the closing of the Public Offering does not occur prior to such date.

   

  Section 7. Survival of Representations and Warranties. All of the representations and warranties contained herein shall survive each Closing
    Date.

   

  Section 8. Definitions. Terms used but not otherwise defined in this Agreement shall have the meaning assigned to such terms in the Registration
    Statement.

   

  Section 9. Miscellaneous.

   

  A. Successors and Assigns. Except as otherwise expressly provided herein, all covenants and agreements contained in this Agreement by or on
    behalf of any of the parties hereto shall bind and inure to the benefit of the respective successors of the parties hereto whether so expressed or not. Notwithstanding the foregoing or anything to the contrary herein, the parties may not assign this
    Agreement, other than assignments by the Purchaser to affiliates thereof.

   

  B. Severability. Whenever possible, each provision of this Agreement shall be interpreted in such manner as to be effective and valid under
    applicable law, but if any provision of this Agreement is held to be prohibited by or invalid under applicable law, such provision shall be ineffective only to the extent of such prohibition or invalidity, without invalidating the remainder of this
    Agreement.

   

  C. Counterparts. This Agreement may be executed simultaneously in two or more counterparts, none of which need contain the signatures of more
    than one party, but all such counterparts taken together shall constitute one and the same agreement.

   

  D. Descriptive Headings; Interpretation. The descriptive headings of this Agreement are inserted for convenience only and do not constitute a
    substantive part of this Agreement. The use of the word “including” in this Agreement shall be by way of example rather than by limitation.

   

  E. Governing Law. This Agreement shall be deemed to be a contract made under the laws of the State of New York and for all purposes shall be
    construed in accordance with the internal laws of the State of New York.

   

   

  

  
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  F. Amendments. This Agreement may not be amended, modified or waived as to any particular provision, except by a written instrument executed
    by all parties hereto.

   

  [Signature page follows]

   

   

  

  
    7

    
      

  

   

  IN WITNESS WHEREOF, the parties hereto have executed this Agreement to be effective as of the
    date first set forth above.

   

  	 	COMPANY:
	 	 
	 	FORTISTAR SUSTAINABLE SOLUTIONS CORP.
	 	 	 	 	 
	 	 	By:	 
	 	 	 	Name:	Nadeem Nisar
	 	 	 	Title:	Chief Executive Officer and Director
	 	 	 	 	 
	 	PURCHASER:
	 	 	 
	 	FSSC SPONSOR LLC
	 	 	 	 	 
	 	 	By:	 
	 	 	 	Name:	Scott Contino
	 	 	 	Title:	Chief Executive Officer

   

  [Signature page to Private Placement Warrants Purchase Agreement]

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