Exhibit 10.3(b)

   

  PRIVATE PLACEMENT WARRANTS PURCHASE AGREEMENT

   

  THIS PRIVATE PLACEMENT WARRANTS PURCHASE AGREEMENT (as it may from time to time be amended and including all exhibits referenced herein, this “Agreement”),






    dated as of [●], 2021, is entered into by and between HCM Acquisition Corp, a Cayman Islands exempted company (the “Company”), and Cantor Fitzgerald & Co., a company with its
    principal place of business in New York (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 Class A ordinary share of the Company, par value $0.0001 per share (each, a “Share”), and one-half of one redeemable warrant, each whole warrant entitling the holder to purchase one Share at an exercise price
    of $11.50 per Share, as set forth in the Company’s Registration Statement on Form S-1, filed with the U.S. Securities and Exchange Commission (the “SEC”), File Number 333-253673 (the “Registration Statement”),
    under the Securities Act of 1933, as amended (the “Securities Act”).

   

  WHEREAS, the Purchaser has agreed to purchase an aggregate of 2,500,000 warrants (the “Private Placement Warrants”), each
    Private Placement Warrant entitling the holder to purchase one Share at an exercise price of $11.50 per Share, at a price of $1.00 per warrant, subject to adjustment.

   

  WHEREAS, concurrently with the execution of this Agreement, the Company is entering into that certain private placement warrants purchase
    agreement (the “Sponsor Warrants Purchase Agreement”), dated as of the date hereof, with HCM Investor Holdings, LLC, a Delaware limited liability company (“Sponsor”), pursuant to which the Sponsor has agreed to
    purchase an aggregate of 9,750,000 warrants (or up to 10,500,000 warrants if the overallotment option is exercised in full) (the “Sponsor Warrants”).

   

  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 (the “IPO Closing Date”), the Company shall issue and sell
    to the Purchaser, and the Purchaser shall purchase from the Company, 2,500,000 Private Placement Warrants at a price of $1.00 per warrant for an aggregate purchase price of $2,500,000 (the “Purchase Price”). The Purchaser
    shall pay the

   

  
     

    
      
 

  

  
   

  Purchase Price by wire transfer of immediately available funds in the following amounts: (i) $[•] to the Company at a financial institution to be
    chosen by the Company, and (ii) $[•] to the trust account maintained by Continental Stock Transfer & Trust Company, acting as trustee (the “Trust Account”), in each case in accordance with the Company’s wiring instructions, at least
    one (1) business day prior to the IPO Closing Date. On the IPO Closing Date, subject to the receipt of funds pursuant to the immediately prior sentence, 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.

   

  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 on
    the IPO Closing Date, in connection with the Public Offering (the “Warrant Agreement”). Notwithstanding the terms of the Warrant Agreement, the Private Placement Warrants purchased by the Purchaser shall not be exercised
    more than five years from the Effective Date.

  

   

  (ii) On the IPO Closing Date, the Company and the Purchaser shall enter into a registration and shareholder rights agreement (the “Registration






            and Shareholder 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.

   

  

  (iii) The Purchaser acknowledge and agree that the Private Placement Warrants and the related registration rights will be deemed compensation by
    the Financial Industry Regulatory Authority (“FINRA”) and will therefore be subject to lock-up for a period of 180 days immediately following the date of effectiveness. Pursuant to FINRA Rule
    5110(e)(1), the Private Placement Warrants and their component parts and the related registration rights may not be sold, transferred, assigned, pledged or hypothecated or be the subject of any hedging, short sale, derivative, put or call transaction
    that would result in the economic disposition of such securities by any person during the foregoing 180 day period following the effective date of the Registration Statement except to any underwriter or selected dealers participating in the Public
    Offering and the officers or partners, registered persons or affiliates or partners thereof.

  

   

  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. Incorporation and Corporate Power. The Company is an exempted company duly incorporated, validly existing and in good standing under
    the laws of the Cayman Islands 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.

   

  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, 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). 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 the 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

   

  
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  the respective terms hereof and thereof by the Company, do not and will not as of the 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 share capital 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 memorandum and articles of association of the Company (in effect on
    the date hereof or as may be amended prior to completion of the 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 and the
    amended and restated memorandum and articles of association of the Company, and upon registration in the Company’s register of members, the Shares issuable upon exercise of the Private Placement Warrants will be duly and validly issued as fully paid
    and nonassessable. On the date of issuance of the Private Placement Warrants, the Shares issuable upon exercise of the Private Placement Warrants shall have been reserved for issuance in accordance with the terms of this Agreement. Upon issuance in
    accordance with, and payment pursuant to, the terms hereof and the Warrant Agreement, and upon registration in the Company’s register of members, the Purchaser will have good title to the Private Placement Warrants purchased by it 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.

   

  E. Regulation D Qualification. Neither the Company nor, to its actual knowledge, any of its affiliates, members, officers, directors or
    beneficial shareholders of 20% or more of its outstanding securities, has experienced a disqualifying event as enumerated pursuant to Rule 506(d) of Regulation D under the Securities Act.

   

  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.

   

  B. Authorization; No Breach.

   

   

  
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  (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 (a) conflict with or result in a breach by the Purchaser 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 Purchaser’s equity or assets under, (d) result in a violation of, or (e) require 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 Purchaser’s organizational documents 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
    Purchaser is subject, or any agreement, instrument, order, judgment or decree to which the Purchaser is subject, except for any filings required after the date hereof under federal or state securities laws.

   

  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 its 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, and the
    Purchaser has not experienced a disqualifying event as enumerated pursuant to Rule 506(d) 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

   

  
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  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.

   

  (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 and
    Shareholder 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 an initial 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 investments 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 the 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.

   

   

  
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  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 and Registration and Shareholder Rights Agreement. The Company shall have entered into the Warrant Agreement, in the
    form of Exhibit A hereto, and the Registration and Shareholder Rights Agreement, in the form of Exhibit B hereto, in each case 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.

   

  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. Corporate Consents. The Company shall have obtained the consent of its Board of Directors authorizing the execution, delivery and
    performance of this Agreement and the Warrant Agreement and the issuance and sale of the Private Placement Warrants hereunder.

   

  D. 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.

   

  E. Warrant Agreement. The Company shall have entered into the Warrant Agreement.

   

  F. 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 (including, without limitation one or more of its members).

   

  G. 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.

   

   

  
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  H. 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. Signatures to this Agreement transmitted via facsimile or e-mail shall be valid and effective to bind the party so signing.

   

  I. 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.

   

  J. 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, without giving effect to conflicts of law principles that would result in the application of the laws of another jurisdiction.

   

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

   

  [Signature page follows]

   

   

  
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  IN WITNESS WHEREOF, the parties hereto have executed this Agreement.

   

  	
           

        	
          COMPANY:

        
	
           

        	
           

        	
           

        
	
           

        	
          HCM ACQUISITION CORP

        
	 	 
	
           

        	
          By:

        	
           

        
	
           

        	
           

        	
          Name: Shawn Matthews

        
	
           

        	
           

        	
          Title: Chairman and Chief Executive Officer

        
	
           

        	
           

        	
           

        
	
           

        	
          PURCHASER:

        
	
           

        	
           

        	
           

        
	
           

        	
          CANTOR FITZGERALD & CO.

        
	 	 
	
           

        	
          By:

        	
           

        
	
           

        	
           

        	
          Name: [___]

        
	
           

        	
           

        	
          Title: [___]

        


   

  [Signature Page to Private Placement Warrants Purchase Agreement – HCM Acquisition Corp]

   

  
     

    
      
 

  

  
   

  EXHIBIT A

    

    Warrant Agreement

   

   

  
     

    A-1

    
      
 

  

  
   

   

  EXHIBIT B

      

      Registration and Shareholder Rights Agreement

   

   

  

   B-1