Document:

EX-10.5

 Exhibit 10.5 

BUILD ACQUISITION CORP. 

3500 Jefferson, Suite 303 
 Austin,
Texas 78731 
  

			
	 Build Acquisition Sponsor LLC
 3500 Jefferson,
Suite 303
 Austin, Texas 78731
	  	January 5, 2021

 RE: Securities Subscription Agreement for Founder Shares 

Ladies and Gentlemen: 
 Build Acquisition Corp.,
a Delaware corporation (the “Company”), is pleased to accept the offer Build Acquisition Sponsor LLC, a Delaware limited liability company (the “Subscriber” or “you”), has made to subscribe for
5,750,000 of the Company’s Class B common stock (the “Shares”), $0.0001 par value per share (the “Class B Shares”), up to 750,000 of which are subject to forfeiture by you if the
underwriters of the Company’s initial public offering of its securities (“IPO”), if any, do not fully exercise their over-allotment option (the “Over-allotment Option”). For the purposes of this agreement (this
“Agreement”), references to “Common Stock” are to, collectively, the Class B Shares and the Company’s shares of Class A common stock, $0.0001 par value per share (the
“Class A Shares”). Upon certain terms and conditions, the Class B Shares will automatically convert into Class A Shares on a
one-for-one basis, subject to adjustment. Unless the context otherwise requires, as used herein “Shares” shall be deemed to include any Class A
Shares issued upon conversion of the Class B Shares comprising the Shares. The terms on which the Company is willing to issue the Shares to the Subscriber, and the Company and the Subscriber’s agreements regarding such Shares, are as
follows: 
 1. Subscription of Shares. 

For the sum of $25,000, for which the Company acknowledges payment by one of its officers, directors or affiliates on the Subscriber’s
behalf to cover a portion of certain IPO-related offering costs, the Company hereby issues the Shares to the Subscriber, and the Subscriber hereby subscribes for the Shares from the Company, 750,000 of which
are subject to forfeiture in accordance with Section 3 hereof, 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 register the Shares in
the name of the Subscriber on the register of members of the Company and, 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. All references in this Agreement to Shares being forfeited shall take effect as surrenders for no consideration of such shares as a matter of Delaware law. 

2. Representations, Warranties and Agreements. 

2.1 Subscriber’s Representations, Warranties and Agreements. To induce the Company to issue the Shares 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 Shares. 
 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 Incorporation and Authority. The Subscriber is a Delaware limited liability company formed
and registered, validly existing and in good standing under the laws of the State 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 Shares and (ii) able to bear the economic risk of its investment in the Shares for an indefinite period of time because the Shares have not been registered under the Securities Act (as
defined below) and therefore cannot be sold unless such transaction is 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 Shares 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 Shares and to afford a complete loss of the Subscriber’s investment in the Shares. 

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 Private Placement. 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 Rule 501(a) of Regulation D under the Securities Act or similar exemptions under state law. 

2.1.7 Investment Purposes. The Subscriber is purchasing and subscribing for the Shares 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 of Regulation D under the Securities Act. 
 2.1.8 Restrictions on
Transfer; Shell Company. The Subscriber understands the Shares are being offered in a transaction not involving a public offering within the meaning of the Securities Act. The Subscriber understands the Shares will be “restricted
securities” within the meaning of Rule 144(a)(3) under the Securities Act and the Subscriber understands that any certificates or book-entries representing the Shares will contain a legend in respect of such restrictions. If in the future the
Subscriber decides to offer, resell, pledge or otherwise transfer the Shares, such Shares 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 Shares or any interest therein is proposed to be made, as a condition precedent to any such transfer, the Subscriber may, at the Company’s option, 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 Shares. 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 Shares until at least one year following consummation of the initial business combination of the Company (which may not occur), 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 Shares, the Company hereby
represents and warrants to the Subscriber and agrees with the Subscriber as follows: 
 2.2.1 Incorporation 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 Company’s Certificate of Incorporation or Bylaws, as amended to the date hereof (collectively, the
“Organizational Documents”), (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 Shares. Upon issuance in accordance with, and payment pursuant to, the terms
hereof and the Organizational Documents, the Shares will be duly and validly issued as fully paid and nonassessable. Upon issuance in accordance with, and payment pursuant to, the terms hereof and the Organizational Documents, the Subscriber will
have or receive good title to the Shares, 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 Shares 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 seek to recover damages or to
obtain other relief in connection with any transactions. 
 2.2.5 Authorization. The Class A Shares issuable upon conversion of
the Class B Shares have been hereby 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 at the time such Over-allotment Option expires (or earlier if the underwriters of the IPO waive their
ability to exercise such Over-allotment Option) 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 number of Shares will equal 20% of the issued and outstanding Common Stock immediately following the IPO (in each case, not including Class A Shares issuable upon exercise of any warrants). Such forfeiture shall take effect
as a surrender for no consideration as a matter of Delaware law, and shall occur upon the expiration, or early waiver of the Over-allotment Option. 

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 Certificate, if
any, is required pursuant to this Section 3, then the Subscriber shall return such Original Certificate 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 or the register of members of the Company (as applicable). 

4. Waiver of Liquidation Distributions; Redemption Rights. In connection with the Shares purchased and subscribed for 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 Shares so purchased and subscribed for 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”) to be dated on or prior to the closing of the IPO by and among the
Subscriber, the Company and the other parties thereto, the Subscriber agrees not to sell, transfer, pledge, hypothecate or otherwise dispose of all or any part of the Shares unless, prior thereto (a) a registration statement on the appropriate
form under the Securities Act and applicable state securities laws with respect to the Shares proposed to be transferred shall then be effective or (b) the Company has received, if requested by the Company, 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 Shares will be
subject to lock-up provisions (the “Lock-up”) contained in the Insider Letter. Pursuant to the Insider Letter, the Subscriber will agree (subject to
certain customary exceptions) not to sell, transfer, pledge, hypothecate or otherwise dispose of all or any part of the Shares until the earliest to occur of: (a) one year after the completion of the Company’s initial business combination
(b), the date on which the last reported sale price of the Class A Shares equals or exceeds $12.00 per share (as adjusted for stock splits, stock dividends, reorganizations, recapitalizations and other similar transactions) for any 20-trading days within any 30-trading day period commencing at least 150 days after the Company’s initial business combination and (c) the date on which the Company
completes a liquidation, merger, stock exchange, reorganization or other similar transaction after the Company’s initial business combination that results in all of the Company’s stockholders having the right to exchange their shares of
Common Stock for cash, securities or other property. 

  
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 5.3 Restrictive Legends. Any certificates representing the Shares shall have endorsed
thereon legends substantially as follows: 
 “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 (IF THE COMPANY SO REQUESTS), IS AVAILABLE.” 

“THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO A LOCK-UP AND MAY NOT BE
OFFERED, SOLD, TRANSFERRED, PLEDGED OR OTHERWISE DISPOSED DURING THE TERM OF THE LOCKUP.” 
 5.4 Additional Shares or
Substituted Securities. In the event of the declaration of a stock dividend, the declaration of an extraordinary dividend payable in a form other than Common Stock, a spin-off, a stock 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 Shares subject to this Section 5 or into which such Shares 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 Common Stock subject to this Section 5 and Section 3. 

5.5 Registration Rights. The Subscriber acknowledges that the Shares are being purchased and subscribed for 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 to the address most recently provided to such party or such other address as may be
designated by the other party, (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 the other 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 the other 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. 

  
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 6.3 Entire Agreement. This Agreement, together with that certain Insider Letter to be
entered into between the Subscriber and the Company and the Registration Rights Agreement, each substantially in the form to be filed as an exhibit to the Registration Statement on Form S-1 related to the IPO,
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. No
statement, representation, warranty, covenant or agreement of any kind not expressly set forth in this Agreement shall affect, or be used to interpret, change or restrict, the express terms and provisions of this Agreement. 

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. 
 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. 

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. 

  
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 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. 

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

  
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“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 or repurchase with respect to any of the Shares in connection with an initial business combination or any amendment to the Organizational
Documents, as amended, prior to an initial business combination. 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 this Agreement and return it to us. 
  

					
	 Very truly yours,

	
	BUILD ACQUISITION CORP.
		
	By:	 	/s/ Zeynep Young
		 	Name: Zeynep Young
		 	Title: Co-Chief Executive Officer

  

			
	BUILD ACQUISITION SPONSOR LLC
		
	By:	 	/s/ Lanham Napier
		 	Name: Lanham Napier
		 	Title: Authorized Signatory

 [Signature Page to Securities Subscription Agreement]EX-10.6

 Exhibit 10.6 

SPONSOR WARRANTS PURCHASE AGREEMENT 

[•], 2021 
 THIS SPONSOR
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 Build Acquisition Corp., a
Delaware corporation (the “Company”), and Build Acquisition 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 Class A common stock of the Company, par value $0.0001 per share (a “Share”), and one-third 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, as amended, filed with the U.S.
Securities and Exchange Commission, No. 333-[•] (the “Registration Statement”), under the Securities Act of 1933, as amended (the “Securities Act”).

 WHEREAS, the Purchaser has agreed to purchase, at a price of $1.50 per warrant, an aggregate of 4,000,000 warrants (and up to 4,400,000
warrants if the underwriters in the Public Offering exercise their over-allotment option in full) (the “Private Placement Warrants”), each 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, and, subject to proper exercise of the Private Placement Warrants and against payment therefor, the Shares underlying such 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 “IPO Closing Date”), the Company shall issue and sell to the Purchaser, and the Purchaser shall purchase from the Company, 4,000,000 Private Placement Warrants at a price of $1.50 per Private Placement Warrant
for an aggregate purchase price of $6,000,000 (the “Purchase Price”). The Purchaser shall pay, at least one (1) business day prior to the IPO Closing Date, the Purchase Price by wire transfer of immediately available
funds, to accounts designated by the Company, including to the trust account (the “Trust Account”), at a financial institution to be chosen by the Company, maintained by Continental Stock Transfer & Trust Company,
acting as trustee, in accordance with the Company’s wiring instructions. On the IPO Closing Date, subject to receipt of funds pursuant to the immediately prior sentence, the Company shall effect such delivery in book-entry form. 

(ii) On the date of the consummation of the closing of the over-allotment option, if any, in connection with the Public Offering or on such
earlier time and date as may be mutually agreed by the Purchaser and the Company (an “Over-allotment Closing Date,” and each Over-allotment Closing Date (if any) and the IPO Closing Date, a “Closing
Date”), the Company shall issue and sell to the Purchaser, and the Purchaser shall purchase from the Company, up to 400,000 Private Placement Warrants (or, to the extent the over-allotment option is not exercised in full, a lesser
number of Private Placement Warrants in proportion to the portion of the over-allotment option that is then exercised) at a price of $1.50 per Private Placement Warrant for an aggregate purchase price of up to $600,000 (if the over-allotment option
is exercised in full) (the “Over-allotment Purchase Price”). The Purchaser shall pay the Over-allotment Purchase Price in accordance with the Company’s wire instruction by

 
wire transfer of immediately available funds to the Company or the Trust Account (as set forth in the wire instructions), at least one (1) business day prior to the applicable Over-allotment
Closing Date. On each Over-allotment Closing Date, subject to receipt of funds pursuant to the immediately prior sentence, the Company shall effect such delivery in book-entry form. 

C. Terms of the Private Placement Warrants. 

(i) The Private Placement Warrants are substantially identical to the warrants underlying the units to be offered in the Public Offering except
that (a) the Private Placement Warrants (including the underlying Shares issuable upon exercise of the Private Placement Warrants) will not, except in limited circumstances, be transferable or salable until 30 days after the completion of the
Company’s initial business combination (the “Business Combination”) so long as they are held by the Purchaser or its permitted transferees, and (b) the Private Placement Warrants 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 Registration Rights Agreement (as
defined below) or an exemption from registration is available, and the restrictions described above in clause (a) have expired and (c) each Private Placement Warrant shall have the terms set forth for private placement warrants 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) On or prior to the IPO Closing Date, 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. 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 Warrants, and, subject to proper exercise of the
Private Placement Warrants and against payment therefor, the Shares underlying such Private Placement Warrants, have been duly authorized by the Company. 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 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, 

  
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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 Company’s amended and restated certificate of incorporation and bylaws (each, 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. 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. Upon issuance in accordance with, and payment pursuant to, the terms hereof and the Warrant Agreement (as applicable), the Purchaser
will have good title to the Private Placement Warrants, including the Shares issuable upon exercise of the 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. Assuming the accuracy of the representations and warranties made by the Purchaser in this Agreement, no
consent, approval, order or authorization of, or registration, qualification, designation, declaration or filing with, any federal, state or local governmental authority is required on the part of the Company in connection with the consummation of
the transactions contemplated by this Agreement, except for applicable requirements of 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. 

(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 do 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 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 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. 

  
 3 

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

(iv) 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. 

(v) 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. 

(vi) 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; (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; and
(c) Rule 144 adopted pursuant to the Securities Act will not be available for resale transactions of the Securities prior to a Business Combination and may not be available for resale transactions of the Securities after a Business Combination.

 (vii) 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. 
 (viii) The
Purchaser understands that the Private Placement Warrants shall bear the legend substantially in the form set forth in the Warrant Agreement and be subject to appropriate “stop transfer restrictions”. 

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. 

  
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 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 and Registration Rights Agreement. The
Company shall have entered into the Warrant Agreement and the Registration Rights Agreement, 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. 

Section 6. Termination. 

This Agreement may be terminated at any time after June 30, 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 has not occurred prior to such date. 
 Section 7.
Survival of Representations and Warranties. 
 All of the representations and warranties contained herein shall survive the applicable
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. 

  
 5 

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

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

  
 6 

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

					
	COMPANY:
	
	BUILD ACQUISITION CORP.
		
	By:	 	
                     
    

		 	Name:	 	Zeynep Young
		 	Title:	 	Co-Chief Executive Officer
	
	PURCHASER:
	
	BUILD ACQUISITION SPONSOR LLC
		
	By:	 	  

		 	Name:	 	A. Lanham Napier
		 	Title:	 	Authorized Signatory

 [Signature Page to Private Placement Warrants Purchase Agreement]

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