EX-10.3





 Exhibit 10.3 

PRIVATE PLACEMENT UNITS PURCHASE AGREEMENT 

THIS PRIVATE PLACEMENT UNITS PURCHASE AGREEMENT, dated as of May 25, 2021 (as it may from time to time be amended, this
“Agreement”), is entered into by and between Post Holdings Partnering Corporation, a Delaware corporation (the “Company”), and PHPC 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 Series A common stock of the Company, par value $0.0001 per share (the “Common Shares”), and one-third of one redeemable warrant, where each whole warrant entitles
the holder to purchase one Common Share at an exercise price of $11.50 per share. 
 The Purchaser has agreed to purchase an aggregate of
1,000,000 units (and up to 90,000 additional units if the underwriters in the Public Offering exercise their option to purchase additional units in full) (the “Private Placement Units”), with each Private Placement Unit consisting
of one Common Share (1,000,000 Common Shares in the aggregate, or up to 1,090,000 Common Shares if the underwriters exercise their option to purchase additional units in full) and one-third of one private
placement warrant, each whole warrant entitling the holder to purchase one Common Share at an exercise price of $11.50 per Common Share (333,333 warrants in the aggregate, or up 363,333 warrants if the underwriters exercise their option to purchase
additional units in full) (the “Private Placement 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 Units. 

A. Authorization of the Private Placement Units. The Company has duly authorized the issuance and sale of the Private Placement Units,
including the Common Shares and Private Placement Warrants underlying the Private Placement Units, to the Purchaser. 
 B. Purchase and
Sale of the Private Placement Units. 
 (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, 1,000,000 Private Placement Units at a price
of $10.00 per Private Placement Unit for an aggregate purchase price of $10,000,000 (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. 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 Units purchased by the Purchaser 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 any closing 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) and 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, up to an aggregate of 90,000 Private Placement Units, in the same proportion as the amount of the option that is
then so exercised, at a price of $10.00 per Private Placement Unit for an aggregate purchase price of up to $900,000 (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. 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, at its option, shall deliver a certificate evidencing the Private Placement Units
purchased by the Purchaser 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 Units. 

(i) The Private Placement Units are substantially identical to the units to be offered in the Public Offering except that (a) the
Private Placement Units (including the underlying Common Shares, Private Placement Warrants and the Common Shares issuable upon exercise of the Private Placement Warrants) will not, except in limited circumstances, be transferable, assignable or
salable until 30 days after the completion of the Company’s initial partnering transaction (the “Partnering Transaction”) so long as they are held by the Purchaser or its permitted transferees, and (b) the Private
Placement Units are being purchased pursuant to an exemption from the registration requirements of the Securities Act and will become freely tradable only after the expiration of the lockup described above in clause (a) and they are registered
pursuant to the Investor Rights Agreement (as defined below) or an exemption from registration is available, and the restrictions described above in clause (a) have expired. 

(ii) Each Private Placement Warrant included in the Private Placement Units 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”). 

(iii) At the time of, or prior to, the closing of the Public Offering, the Company, the Purchaser and Post Holdings, Inc., a Missouri
corporation (“Post”), shall enter into an investor rights agreement (the “Investor Rights Agreement”) pursuant to which the Company will grant certain registration rights to the Purchaser and Post relating to the
Private Placement Units, the Private Placement Warrants and the Common Shares underlying the Private Placement Units and Private Placement Warrants. 

  
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 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 Units, the Company hereby represents and warrants to the Purchaser (which representations and warranties shall survive the
Closing Date) that: 
 A. Incorporation 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. 

B. Authorization; No Breach. 

(i) The execution, delivery and performance of this Agreement and the Private Placement Units, including the Common Shares and Private
Placement Units included in the Private Placement Units, have been duly authorized by the Company as of each 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 Units, including the Common Shares and Private Placement Units included in the Private Placement Units, 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 Units, the issuance and sale of the Private Placement Units, the issuance of the Private Placement Warrants and the Common Shares included in the Private Placement
Units, the issuance of the Common 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 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 amended and restated certificate of incorporation and 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
Common Shares included in the Private Placement Units and issuable upon exercise of the Private Placement Warrants will be duly authorized 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 Units purchased by it, the Private Placement Warrants and Common Shares included in the Private Placement Units and the Common Shares issuable
upon 

  
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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 Units 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. 

(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 Units, the Common Shares and Private Placement Warrants included in the Private
Placement Units and, upon exercise of such Private Placement Warrants, the Common Shares issuable upon such exercise (collectively, the “Securities”), for the Purchaser’s own account, for investment purposes only and not with a
view towards the distribution or dissemination thereof that would result in a violation of the Securities Act. 
 (ii) The Purchaser is an
“accredited investor” as such term is defined in Rule 501(a)(3) of Regulation D under the Securities Act of 1933, as amended (the “Securities Act”), and the Purchaser has not experienced a disqualifying event as enumerated
pursuant to Rule 506(d) of Regulation D under the Securities Act. 

  
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 (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 decided to enter into this Agreement not as a result of any general solicitation or general advertising within the meaning
of Rule 502(c) of Regulation D 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. 
 (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) in a registered transaction or (2) sold in reliance on an exemption therefrom;
(b) except as specifically set forth in the Investor 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; and (c) Rule 144 adopted pursuant to the Securities Act will not be available for resale transactions of Securities prior to a Partnering Transaction and may not be available for resale transactions
of Securities after a Partnering Transaction. 
 (viii) The Purchaser has such knowledge and experience in financial and business matters,
knows 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 Units and the Common Shares included in the Private Placement Units shall bear the
following legend and appropriate “stop transfer restrictions”: 

  
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 “THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE UNITED STATES 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, IS AVAILABLE. 
 THE SECURITIES REPRESENTED BY THIS
CERTIFICATE ARE SUBJECT TO LOCKUP PROVISIONS AND MAY NOT BE OFFERED, SOLD, TRANSFERRED, PLEDGED OR OTHERWISE DISPOSED OF DURING THE TERM OF THE LOCKUP.” 

(x) 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 Units 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 
 E. Investor Rights Agreement. The Company shall have
entered into an Investor Rights Agreement with the Purchaser and Post and such Investor Rights Agreement shall still be in effect as of each Closing Date. 

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. 

  
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 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 Units 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 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
December 31, 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 on Form S-1 the Company has filed with the Securities and Exchange Commission, under the
Securities Act. 
 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. 

  
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 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. 
 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] 

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

			
	COMPANY:
	
	POST HOLDINGS PARTNERING CORPORATION
		
	By:	 	/s/ Robert V. Vitale
	Name:	 	Robert V. Vitale
	Title:	 	President and Chief Investment Officer


  

			
	PURCHASER:
	
	PHPC SPONSOR, LLC
		
	By:	 	/s/ Robert V. Vitale
	Name:	 	Robert V. Vitale
	Title:	 	President


 [Signature page to Private Placement Units Purchase Agreement]