EX-10.3





 Exhibit 10.3 

REGISTRATION RIGHTS AGREEMENT 

March 16, 2021 
 THIS
REGISTRATION RIGHTS AGREEMENT (this “Agreement”), dated as of March 16, 2021, is made and entered into by and among Build Acquisition Corp., a Delaware corporation (the “Company”), Build
Acquisition Sponsor LLC, a Delaware limited liability company (the “Sponsor”), and the other parties listed on the signature pages hereto and any person or entity who hereafter becomes a party to this Agreement pursuant
to Section 5.2 of this Agreement (each such party, together with the Sponsor, a “Holder” and collectively, the “Holders”). 

RECITALS 
 WHEREAS,
the Sponsor and certain other Holders collectively own an aggregate of 5,750,000 shares of the Company’s Class B common stock, par value $0.0001 per share (the “Founder Shares”); 

WHEREAS, the Founder Shares are convertible into shares of the Company’s Class A common stock, par value $0.0001 per share
(“Common Stock”), on the terms and conditions provided in the Company’s amended and restated certificate of incorporation, and as may be amended from time to time; 

WHEREAS, on March 16, 2021, the Company and the Sponsor entered into that certain Sponsor Warrants Purchase Agreement, pursuant to
which the Sponsor agreed to purchase 4,000,000 warrants (or up to 4,400,000 warrants depending on the extent to which the underwriters in the Company’s initial public offering exercise over-allotment option) (the “Private Placement
Warrants”) in a private placement transaction to close substantially concurrently with the closing of the Company’s initial public offering; each Private Placement Warrant entitles the holder thereof to purchase one share of Common
Stock at a price of $11.50 per share; and 
 WHEREAS, the Company and the Holders desire to enter into this Agreement, pursuant to
which the Company shall grant the Holders certain registration rights with respect to certain securities of the Company, as set forth in this Agreement. 

NOW, THEREFORE, in consideration of the representations, covenants and agreements contained herein, and certain other good
and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto, intending to be legally bound, hereby agree as follows: 

ARTICLE I 

DEFINITIONS 

1.1    Definitions. The terms defined in this Article I shall, for all purposes of this Agreement, have the
respective meanings set forth below: 
 “Adverse Disclosure” shall mean any public disclosure of material non-public information, which disclosure, in the good faith judgment of the Co-Chief Executive Officer, President, Secretary or Chief Financial Officer of the Company, after
consultation with counsel to the Company, (i) would be required to be made in any Registration Statement or Prospectus in order for the applicable Registration Statement or Prospectus not to contain any untrue statement of a material fact or
omit to state a material fact necessary to make the statements contained therein (in the case of any prospectus and any preliminary prospectus, in the light of the circumstances under which they were made) not misleading, (ii) would not be
required to be made at such time if the Registration Statement were not being filed and (iii) the Company has a bona fide business purpose for not making such information public. 

“Agreement” shall have the meaning given in the Preamble. 

“Board” shall mean the Board of Directors of the Company. 

“Business Combination” shall mean any merger, capital stock exchange, asset acquisition, stock purchase,
reorganization or other similar business combination with one or more businesses, involving the Company. 

“Commission” shall mean the Securities and Exchange Commission. 

  
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 “Common Stock” shall have the meaning given in the Recitals hereto.

 “Company” shall have the meaning given in the Preamble. 

“Demand Registration” shall have the meaning given in subsection 2.1.1. 

“Demanding Holder” shall have the meaning given in subsection 2.1.1. 

“Exchange Act” shall mean the Securities Exchange Act of 1934, as it may be amended from time to time. 

“Form S-1” shall have the meaning given in subsection 2.1.1. 

“Form S-3” shall have the meaning given in subsection 2.3.1. 

“Founder Shares” shall have the meaning given in the Recitals hereto and shall be deemed to include the shares of
Common Stock issuable upon conversion thereof. 
 “Founder Shares Lock-Up
Period” shall mean, with respect to the Founder Shares, the period ending on the earlier of (A) one year after the completion of the Company’s initial Business Combination and (B) subsequent to the Company’s initial
Business Combination, (x) if the last reported sale price of the Common Stock 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 or (y) the date on which the Company completes a liquidation, merger, stock
exchange, reorganization or other similar transaction that results in all of the Company’s public stockholders having the right to exchange their shares of Common Stock for cash, securities or other property. 

“Holders” shall have the meaning given in the Preamble. 

“Insider Letter” shall mean that certain letter agreement, dated March 16, 2021, by and among the Company, the
Sponsor and each of the other parties thereto. 
 “Maximum Number of Securities” shall have the meaning given
in subsection 2.1.4. 
 “Misstatement” shall mean an untrue statement of a material fact or an omission
to state a material fact required to be stated in a Registration Statement or Prospectus or necessary to make the statements in a Registration Statement or Prospectus (in the case of a Prospectus, in the light of the circumstances under which they
were made) not misleading. 
 “Permitted Transferees” shall mean any person or entity to whom a Holder of
Registrable Securities is permitted to transfer such Registrable Securities prior to the expiration of the Founder Shares Lock-Up Period or Private Placement Lock-Up
Period, as the case may be, under the Insider Letter and any other applicable agreement between such Holder and the Company and to any transferee thereafter. 

“Piggyback Registration” shall have the meaning given in subsection 2.2.1. 

“Private Placement Lock-Up Period” shall mean, with respect to Private
Placement Warrants and any Common Stock issued or issuable upon the exercise or conversion of the Private Placement Warrants that are held by the initial purchasers of the Private Placement Warrants or their Permitted Transferees, the period ending
30 days after the completion of the Company’s initial Business Combination. 
 “Private Placement Warrants”
shall have the meaning given in the Recitals. 
 “Prospectus” shall mean the prospectus included in any Registration
Statement, as supplemented by any and all prospectus supplements and as amended by any and all post-effective amendments and including all material incorporated by reference in such prospectus. 

“Registrable Security” shall mean (a) the shares of Common Stock issued or issuable upon the conversion of any
Founder Shares, (b) the Private Placement Warrants (including any shares of Common Stock issued or issuable upon the exercise of any Private Placement Warrant), (c) any outstanding share of Common Stock or any other equity security (including
the shares of Common Stock issued or issuable upon the exercise of any other equity security) of the Company held by a Holder as of the date of this Agreement, (d) any equity 

  
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securities (including the shares of Common Stock issued or issuable upon the exercise of any such equity security) of the Company issuable upon conversion of any working capital loans in an
amount up to $1,500,000 made to the Company by a Holder, and (e) any other equity security of the Company or any of its subsidiaries, or any successor, issued or issuable with respect to any such share of Common Stock by way of a stock dividend
or stock split or in connection with a combination of shares, recapitalization, merger, consolidation, spin-off or reorganization; provided, however, that, as to any particular
Registrable Security, such securities shall cease to be Registrable Securities when: (A) a Registration Statement with respect to the sale of such securities shall have become effective under the Securities Act and such securities shall have
been sold, transferred, disposed of or exchanged in accordance with such Registration Statement; (B) such securities shall have been otherwise transferred, new certificates for such securities not bearing a legend restricting further transfer
shall have been delivered by the Company and subsequent public distribution of such securities shall not require registration under the Securities Act; (C) such securities shall have ceased to be outstanding; (D) such securities have been
sold without registration pursuant to Section 4(a)(1) of the Securities Act or Rule 144 or Rule 145 promulgated under the Securities Act (or any successor rule promulgated thereafter by the Commission); or (E) such securities have been
sold to, or through, a broker, dealer or underwriter in a public distribution or other public securities transaction. 

“Registration” shall mean a registration effected by preparing and filing a registration statement or similar document
in compliance with the requirements of the Securities Act, and the applicable rules and regulations promulgated thereunder, and such registration statement becoming effective. 

“Registration Expenses” shall mean the
out-of-pocket expenses of a Registration, including, without limitation, the following: 
  

	 	(A)	 all registration and filing fees (including fees with respect to filings required to be made with the Financial
Industry Regulatory Authority, Inc.) and any securities exchange on which the Common Stock is then listed; 


  

	 	(B)	 fees and expenses of compliance with securities or blue sky laws (including reasonable fees and disbursements
of outside counsel for the Underwriters in connection with blue sky qualifications of Registrable Securities); 


  

	 	(C)	 printing, messenger, telephone and delivery expenses; 



 

	 	(D)	 reasonable fees and disbursements of counsel for the Company; 



 

	 	(E)	 reasonable fees and disbursements of all independent registered public accountants of the Company incurred
specifically in connection with such Registration; and 


  

	 	(F)	 reasonable fees and expenses of one (1) legal counsel selected by the majority-in-interest of the Demanding Holders initiating a Demand Registration to be registered for offer and sale in the applicable Registration. 



“Registration Statement” shall mean any registration statement that covers the Registrable Securities pursuant to the
provisions of this Agreement, including the Prospectus included in such registration statement, amendments (including post-effective amendments) and supplements to such registration statement, and all exhibits to and all material incorporated by
reference in such registration statement. 
 “Requesting Holder” shall have the meaning given in subsection
2.1.1. 
 “Securities Act” shall mean the Securities Act of 1933, as amended from time to time. 

“Shelf” shall have the meaning given in subsection 2.3.1. 

“Sponsor” shall have the meaning given in the Preamble. 

“Underwriter” shall mean a securities dealer who purchases any Registrable Securities as principal in an Underwritten
Offering and not as part of such dealer’s market-making activities. 
 “Underwritten Registration” or
“Underwritten Offering” shall mean a Registration in which securities of the Company are sold to an Underwriter in a firm commitment underwriting for distribution to the public. 

  
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 ARTICLE II 

REGISTRATIONS 

2.1    Demand Registration. 

2.1.1    Request for Registration. Subject to the provisions of subsection
2.1.4 and Section 2.4 hereof, at any time and from time to time on or after the date the Company consummates the initial Business Combination, the Holders of at least thirty percent (30%) in interest of the then
outstanding number of Registrable Securities (the “Demanding Holders”) may make a written demand for Registration under the Securities Act of all or part of their Registrable Securities, which written demand shall describe
the amount and type of securities to be included in such Registration and the intended method(s) of distribution thereof (such written demand a “Demand Registration”). The Company shall, within ten (10) days of the
Company’s receipt of the Demand Registration, notify, in writing, all other Holders of Registrable Securities of such demand, and each Holder of Registrable Securities who thereafter wishes to include all or a portion of such Holder’s
Registrable Securities in a Registration pursuant to a Demand Registration (each such Holder that includes all or a portion of such Holder’s Registrable Securities in such Registration, a “Requesting Holder”) shall so
notify the Company, in writing, within five (5) days after the receipt by the Holder of the notice from the Company. Upon receipt by the Company of any such written notification from a Requesting Holder(s) to the Company, such Requesting
Holder(s) shall be entitled to have their Registrable Securities included in a Registration pursuant to a Demand Registration and the Company shall effect, as soon thereafter as practicable, the Registration of all Registrable Securities requested
by the Demanding Holder(s) and Requesting Holder(s) pursuant to such Demand Registration, including by filing a Registration Statement relating thereto as soon as practicable, but not more than forty five (45) days immediately after the
Company’s receipt of the Demand Registration. Under no circumstances shall the Company be obligated to effect more than an aggregate of three (3) Registrations pursuant to a Demand Registration under this subsection
2.1.1 with respect to any or all Registrable Securities; provided, however, that a Registration shall not be counted for such purposes unless a Form S-1 or any similar
long-form registration statement that may be available at such time (“Form S-1”) has become effective and all of the Registrable Securities requested by the Requesting Holders to be
registered on behalf of the Requesting Holders in such Form S-1 Registration have been sold, in accordance with Section 3.1 of this Agreement. 

2.1.2    Effective Registration. Notwithstanding the provisions of subsection 2.1.1 above or any
other part of this Agreement, a Registration pursuant to a Demand Registration shall not count as a Registration unless and until (i) the Registration Statement filed with the Commission with respect to a Registration pursuant to a Demand
Registration has been declared effective by the Commission and (ii) the Company has complied with all of its obligations under this Agreement with respect thereto; provided, further, that if, after such Registration
Statement has been declared effective, an offering of Registrable Securities in a Registration pursuant to a Demand Registration is subsequently interfered with by any stop order or injunction of the Commission, federal or state court or any other
governmental agency the Registration Statement with respect to such Registration shall be deemed not to have been declared effective, unless and until, (i) such stop order or injunction is removed, rescinded or otherwise terminated, and
(ii) a majority-in-interest of the Demanding Holders initiating such Demand Registration thereafter affirmatively elect to continue with such Registration and
accordingly notify the Company in writing, but in no event later than five (5) days, of such election; provided, further, that the Company shall not be obligated or required to file another Registration Statement until
the Registration Statement that has been previously filed with respect to a Registration pursuant to a Demand Registration becomes effective or is subsequently terminated. 

2.1.3    Underwritten Offering. Subject to the provisions of subsection
2.1.4 and Section 2.4 hereof, if a majority-in-interest of the Demanding Holders so advise the Company as part of their Demand
Registration that the offering of the Registrable Securities pursuant to such Demand Registration shall be in the form of an Underwritten Offering, then the right of such Demanding Holder or Requesting Holder (if any) to include its Registrable
Securities in such Registration shall be conditioned upon such Holder’s participation in such Underwritten Offering and the inclusion of such Holder’s Registrable Securities in such Underwritten Offering to the extent provided herein. All
such Holders proposing to distribute their Registrable Securities through an Underwritten Offering under this subsection 2.1.3 shall enter into an underwriting agreement in customary form with the Underwriter(s) selected for such
Underwritten Offering by the majority-in-interest of the Demanding Holders initiating the Demand Registration. 

2.1.4    Reduction of Underwritten Offering. If the managing Underwriter or Underwriters in an Underwritten
Registration pursuant to a Demand Registration, in good faith, advises the Company, the 

  
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Demanding Holders and the Requesting Holders (if any) in writing that the dollar amount or number of Registrable Securities that the Demanding Holders and the Requesting Holders (if any) desire
to sell, taken together with all other shares of Common Stock or other equity securities that the Company desires to sell and the shares of Common Stock, if any, as to which a Registration has been requested pursuant to separate written contractual
piggy-back registration rights held by any other stockholders who desire to sell, exceeds the maximum dollar amount or maximum number of equity securities that can be sold in the Underwritten Offering without adversely affecting the proposed
offering price, the timing, the distribution method, or the probability of success of such offering (such maximum dollar amount or maximum number of such securities, as applicable, the “Maximum Number of Securities”), then
the Company shall include in such Underwritten Offering, as follows: (i) first, the Registrable Securities of the Demanding Holders and the Requesting Holders (if any) (pro rata based on the respective number of Registrable Securities that each
Demanding Holder and Requesting Holder (if any) has requested be included in such Underwritten Registration and the aggregate number of Registrable Securities that the Demanding Holders and Requesting Holders have requested be included in such
Underwritten Registration) that can be sold without exceeding the Maximum Number of Securities; (ii) second, to the extent that the Maximum Number of Securities has not been reached under the foregoing clause (i), the Common Stock or other
equity securities that the Company desires to sell, which can be sold without exceeding the Maximum Number of Securities; and (iii) third, to the extent that the Maximum Number of Securities has not been reached under the foregoing clauses
(i) and (ii), the Common Stock or other equity securities of other persons or entities that the Company is obligated to register in a Registration pursuant to separate written contractual arrangements with such persons and that can be sold
without exceeding the Maximum Number of Securities. 
 2.1.5    Demand Registration Withdrawal. A majority-in-interest of the Demanding Holders initiating a Demand Registration or a
majority-in-interest of the Requesting Holders (if any), pursuant to a Registration under subsection 2.1.1 shall have the right to withdraw from a
Registration pursuant to such Demand Registration for any or no reason whatsoever upon written notification to the Company and the Underwriter or Underwriters (if any) of their intention to withdraw from such Registration prior to the effectiveness
of the Registration Statement filed with the Commission with respect to the Registration of their Registrable Securities pursuant to such Demand Registration (or in the case of an Underwritten Registration pursuant to Rule 415 under the Securities
Act, at least two business days prior to the time of pricing of the applicable offering). Notwithstanding anything to the contrary in this Agreement, (i) the Company may effect any Underwritten Registration pursuant to any then effective
Registration Statement, including a Form S-3, that is then available for such offering and (ii) the Company shall be responsible for the Registration Expenses incurred in connection with a Registration
pursuant to a Demand Registration prior to its withdrawal under this subsection 2.1.5. 
 2.2    Piggyback
Registration. 
 2.2.1    Piggyback Rights. If, at any time on or after the date the Company consummates an
initial Business Combination, the Company proposes to file a Registration Statement under the Securities Act with respect to an offering of equity securities, or securities or other obligations exercisable or exchangeable for, or convertible into
equity securities, for its own account or for the account of stockholders of the Company (or by the Company and by the stockholders of the Company including, without limitation, pursuant to Section 2.1 hereof), other than a Registration
Statement (i) filed in connection with any employee stock option or other benefit plan, (ii) for an exchange offer or offering of securities solely to the Company’s existing stockholders, (iii) for an offering of debt that is
convertible into equity securities of the Company or (iv) for a dividend reinvestment plan, then the Company shall give written notice of such proposed filing to all of the Holders of Registrable Securities as soon as practicable but not less
than ten (10) days before the anticipated filing date of such Registration Statement, which notice shall (A) describe the amount and type of securities to be included in such offering, the intended method(s) of distribution, and the name
of the proposed managing Underwriter or Underwriters, if any, in such offering, and (B) offer to all of the Holders of Registrable Securities the opportunity to register the sale of such number of Registrable Securities as such Holders may
request in writing within five (5) days after receipt of such written notice (such Registration a “Piggyback Registration”). The Company shall, in good faith, cause such Registrable Securities to be included in such
Piggyback Registration and shall use its best efforts to cause the managing Underwriter or Underwriters of a proposed Underwritten Offering to permit the Registrable Securities requested by the Holders pursuant to this subsection
2.2.1 to be included in a Piggyback Registration on the same terms and conditions as any similar securities of the Company included in such Registration and to permit the sale or other disposition of such Registrable Securities in
accordance with the intended method(s) of distribution thereof. All such Holders proposing to distribute their Registrable Securities through an Underwritten Offering under this subsection 2.2.1 shall enter into an underwriting
agreement in customary form with the Underwriter(s) selected for such Underwritten Offering by the Company. 

  
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 2.2.2    Reduction of Piggyback Registration. If the managing
Underwriter or Underwriters in an Underwritten Registration that is to be a Piggyback Registration, in good faith, advises the Company and the Holders of Registrable Securities participating in the Piggyback Registration in writing that the dollar
amount or number of shares of the Common Stock that the Company desires to sell, taken together with (i) the shares of Common Stock, if any, as to which Registration has been demanded pursuant to separate written contractual arrangements with
persons or entities other than the Holders of Registrable Securities hereunder, (ii) the Registrable Securities as to which registration has been requested pursuant to Section 2.2 hereof, and (iii) the shares of
Common Stock, if any, as to which Registration has been requested pursuant to separate written contractual piggy-back registration rights of other stockholders of the Company, exceeds the Maximum Number of Securities, then: 

(a)    If the Registration is undertaken for the Company’s account, the Company shall include in any such
Registration (A) first, the shares of Common Stock or other equity securities that the Company desires to sell, which can be sold without exceeding the Maximum Number of Securities; (B) second, to the extent that the Maximum Number of
Securities has not been reached under the foregoing clause (A), the Registrable Securities of Holders exercising their rights to register their Registrable Securities pursuant to subsection 2.2.1 hereof, pro rata, based on the
respective number of Registrable Securities that each Holder has so requested exercising its rights to register its Registrable Securities pursuant to subsection 2.2.1 hereof, which can be sold without exceeding the Maximum Number
of Securities; and (C) third, to the extent that the Maximum Number of Securities has not been reached under the foregoing clauses (A) and (B), the shares of Common Stock, if any, as to which Registration has been requested pursuant to
written contractual piggy-back registration rights of other stockholders of the Company, which can be sold without exceeding the Maximum Number of Securities; 

(b)    If the Registration is pursuant to a request by persons or entities other than the Holders of Registrable
Securities, then the Company shall include in any such Registration (A) first, the shares of Common Stock or other equity securities, if any, of such requesting persons or entities, other than the Holders of Registrable Securities, which can be
sold without exceeding the Maximum Number of Securities; (B) second, to the extent that the Maximum Number of Securities has not been reached under the foregoing clause (A), the Registrable Securities of Holders exercising their rights to
register their Registrable Securities pursuant to subsection 2.2.1, pro rata, based on the respective number of Registrable Securities that each Holder has requested be included in such Underwritten Registration and the aggregate number
of Registrable Securities that the Holders have requested to be included in such Underwritten Registration, which can be sold without exceeding the Maximum Number of Securities; (C) third, to the extent that the Maximum Number of Securities has
not been reached under the foregoing clauses (A) and (B), the shares of Common Stock or other equity securities that the Company desires to sell, which can be sold without exceeding the Maximum Number of Securities; and (D) fourth, to the
extent that the Maximum Number of Securities has not been reached under the foregoing clauses (A), (B) and (C), the shares of Common Stock or other equity securities for the account of other persons or entities that the Company is obligated to
register pursuant to separate written contractual arrangements with such persons or entities, which can be sold without exceeding the Maximum Number of Securities. 

2.2.3    Piggyback Registration Withdrawal. Any Holder of Registrable Securities shall have the right to withdraw
from a Piggyback Registration for any or no reason whatsoever upon written notification to the Company and the Underwriter or Underwriters (if any) of his, her or its intention to withdraw from such Piggyback Registration prior to the effectiveness
of the Registration Statement filed with the Commission with respect to such Piggyback Registration (or in the case of an Underwritten Registration pursuant to Rule 415 under the Securities Act, at least two business days prior to the time of
pricing of the applicable offering). The Company (whether on its own good faith determination or as the result of a request for withdrawal by persons pursuant to separate written contractual obligations) may withdraw a Registration Statement filed
with the Commission in connection with a Piggyback Registration at any time prior to the effectiveness of such Registration Statement. Notwithstanding anything to the contrary in this Agreement, the Company shall be responsible for the Registration
Expenses incurred in connection with the Piggyback Registration prior to its withdrawal under this subsection 2.2.3. 

2.2.4    Unlimited Piggyback Registration Rights. For purposes of clarity, any Registration effected pursuant
to Section 2.2 hereof shall not be counted as a Registration pursuant to a Demand Registration effected under Section 2.1 hereof. 

  
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 2.3    Shelf Registrations. 

2.3.1    The Holders of Registrable Securities may at any time, and from time to time, request in writing that the Company,
pursuant to Rule 415 under the Securities Act (or any successor rule promulgated thereafter by the Commission), register the resale of any or all of their Registrable Securities on Form S-3 or any similar
short-form registration statement that may be available at such time (“Form S-3”), or if the Company is ineligible to use Form S-3, on Form S-1; a registration statement filed pursuant to this subsection 2.3.1 (a “Shelf”) shall provide for the resale of the Registrable Securities included therein pursuant to any method or
combination of methods legally available to, and requested by, any Holder. Within three (3) days of the Company’s receipt of a written request from a Holder or Holders of Registrable Securities for a Registration on a Shelf, the Company
shall promptly give written notice of the proposed Registration to all other Holders of Registrable Securities, and each Holder of Registrable Securities who thereafter wishes to include all or a portion of such Holder’s Registrable Securities
in such Registration shall so notify the Company, in writing, within three (3) days after the receipt by the Holder of the notice from the Company. As soon as practicable thereafter, but not more than ten (10) days after the Company’s
initial receipt of such written request for a Registration on a Shelf, the Company shall file a Registration Statement relating to all or such portion of such Holder’s Registrable Securities as are specified in such written request, together
with all or such portion of Registrable Securities of any other Holder or Holders joining in such request as are specified in the written notification given by such Holder or Holders; provided, however, that the Company shall not
be obligated to effect any such Registration pursuant to this subsection 2.3.1 if the Holders of Registrable Securities, together with the Holders of any other equity securities of the Company entitled to inclusion in such Registration,
propose to sell the Registrable Securities and such other equity securities (if any) at any aggregate price to the public of less than $5,000,000. The Company shall maintain each Shelf in accordance with the terms hereof, and shall prepare and file
with the Commission such amendments, including post-effective amendments, and supplements as may be necessary to keep such Shelf continuously effective, available for use and in compliance with the provisions of the Securities Act until such time as
there are no longer any Registrable Securities included on such Shelf. In the event the Company files a Shelf on Form S-1, the Company shall use its commercially reasonable efforts to convert the Form S-1 to a Form S-3 as soon as practicable after the Company is eligible to use Form S-3. 

2.4    Restrictions on Registration Rights. If (A) during the period starting with the date sixty
(60) days prior to the Company’s good faith estimate of the date of the filing of, and ending on a date one hundred and twenty (120) days after the effective date of, a Company initiated Registration and provided that the Company has
delivered written notice to the Holders prior to receipt of a Demand Registration pursuant to subsection 2.1.1 and it continues to actively employ, in good faith, all reasonable efforts to cause the applicable Registration Statement
to become effective; (B) the Holders have requested an Underwritten Registration and the Company and the Holders are unable to obtain the commitment of underwriters to firmly underwrite the offer; or (C) in the good faith judgment of the
Board such Registration would be seriously detrimental to the Company and the Board concludes as a result that it is essential to defer the filing of such Registration Statement at such time, then in each case the Company shall furnish to such
Holders a certificate signed by the Chairman of the Board, the Co-Chief Executive Officer, the President or the Secretary of the Company stating that in the good faith judgment of the Board it would be
seriously detrimental to the Company for such Registration Statement to be filed in the near future and that it is therefore essential to defer the filing of such Registration Statement. In such event, the Company shall have the right to defer such
filing for a period of not more than thirty (30) days; provided, however, that the Company shall not defer its obligation in this manner more than once in any 12-month period.
Notwithstanding anything to the contrary contained in this Agreement, the Company shall not be required to effect or permit any Registration or cause any Registration Statement to become effective, with respect to any Registrable Securities held by
any Holder, until after the expiration of the Founder Shares Lock-Up Period or the Private Placement Lock-Up Period, as the case may be. 

ARTICLE III 
 COMPANY
PROCEDURES 
 3.1    General Procedures. If at any time on or after the date the Company consummates an
initial Business Combination, the Company is required to effect the Registration of Registrable Securities, the Company shall use its best efforts to effect such Registration to permit the sale of such Registrable Securities in accordance with the
intended plan of distribution thereof, and pursuant thereto the Company shall, as expeditiously as possible: 

3.1.1    prepare and file with the Commission as soon as practicable a Registration Statement with respect to such
Registrable Securities and use its reasonable best efforts to cause such Registration Statement to become effective and remain effective until all Registrable Securities covered by such Registration Statement have been sold; 

  
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 3.1.2    prepare and file with the Commission such amendments and
post-effective amendments to the Registration Statement, and such supplements to the Prospectus, as may be reasonably requested by the majority-in-interest of the
Holders with Registrable Securities registered on such Registration Statement or any Underwriter of Registrable Securities or as may be required by the rules, regulations or instructions applicable to the registration form used by the Company or by
the Securities Act or rules and regulations thereunder to keep the Registration Statement effective until all Registrable Securities covered by such Registration Statement are sold in accordance with the intended plan of distribution set forth in
such Registration Statement or supplement to the Prospectus; 
 3.1.3    prior to filing a Registration Statement or
Prospectus, or any amendment or supplement thereto, furnish without charge to the Underwriters, if any, and the Holders of Registrable Securities included in such Registration, and such Holders’ legal counsel, copies of such Registration
Statement as proposed to be filed, each amendment and supplement to such Registration Statement (in each case including all exhibits thereto and documents incorporated by reference therein), the Prospectus included in such Registration Statement
(including each preliminary Prospectus), and such other documents as the Underwriters and the Holders of Registrable Securities included in such Registration or the legal counsel for any such Holders may request in order to facilitate the
disposition of the Registrable Securities owned by such Holders; 
 3.1.4    prior to any public offering of Registrable
Securities, use its best efforts to (i) register or qualify the Registrable Securities covered by the Registration Statement under such securities or “blue sky” laws of such jurisdictions in the United States as the
Holders of Registrable Securities included in such Registration Statement (in light of their intended plan of distribution) may request and (ii) take such action necessary to cause such Registrable Securities covered by the Registration
Statement to be registered with or approved by such other governmental authorities as may be necessary by virtue of the business and operations of the Company and do any and all other acts and things that may be necessary or advisable to enable the
Holders of Registrable Securities included in such Registration Statement to consummate the disposition of such Registrable Securities in such jurisdictions; provided, however, that the Company shall not be required to
qualify generally to do business in any jurisdiction where it would not otherwise be required to qualify or take any action to which it would be subject to general service of process or taxation in any such jurisdiction where it is not then
otherwise so subject; 
 3.1.5    cause all such Registrable Securities to be listed on each securities exchange or
automated quotation system on which similar securities issued by the Company are then listed; 
 3.1.6    provide a
transfer agent or warrant agent, as applicable, and registrar for all such Registrable Securities no later than the effective date of such Registration Statement; 

3.1.7    advise each seller of such Registrable Securities, promptly after it shall receive notice or obtain knowledge
thereof, of the issuance of any stop order by the Commission suspending the effectiveness of such Registration Statement or the initiation or threatening of any proceeding for such purpose and promptly use its reasonable best efforts to prevent the
issuance of any stop order or to obtain its withdrawal if such stop order should be issued; 
 3.1.8    at least five
(5) days prior to the filing of any Registration Statement or Prospectus or any amendment or supplement to such Registration Statement or Prospectus, furnish a copy thereof to each seller of such Registrable Securities or its counsel; 

3.1.9    notify the Holders at any time when a Prospectus relating to such Registration Statement is required to be
delivered under the Securities Act, of the happening of any event as a result of which the Prospectus included in such Registration Statement, as then in effect, includes a Misstatement, and then to correct such Misstatement as set forth
in Section 3.4 hereof; 
 3.1.10    permit a representative of the Holders, the Underwriters, if
any, and any attorney or accountant retained by such Holders or Underwriter to participate, at each such person’s own expense, in the preparation of the Registration Statement, and cause the Company’s officers, directors and employees to
supply all information reasonably requested by any such representative, Underwriter, attorney or accountant in 

  
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connection with the Registration; provided, however, that such representatives or Underwriters enter into a confidentiality agreement, in form and substance reasonably
satisfactory to the Company, prior to the release or disclosure of any such information; 
 3.1.11    obtain a
“cold comfort” letter from the Company’s independent registered public accountants in the event of an Underwritten Registration, in customary form and covering such matters of the type customarily covered by “cold comfort”
letters as the managing Underwriter may reasonably request, and reasonably satisfactory to a majority-in-interest of the participating Holders; 

3.1.12    on the date the Registrable Securities are delivered for sale pursuant to such Registration, obtain an opinion,
dated such date, of counsel representing the Company for the purposes of such Registration, addressed to the Holders, the placement agent or sales agent, if any, and the Underwriters, if any, covering such legal matters with respect to the
Registration in respect of which such opinion is being given as the Holders, placement agent, sales agent, or Underwriter may reasonably request and as are customarily included in such opinions and negative assurance letters, and reasonably
satisfactory to a majority in interest of the participating Holders; 
 3.1.13    in the event of any Underwritten
Offering, enter into and perform its obligations under an underwriting agreement, in usual and customary form, with the managing Underwriter of such offering; 

3.1.14    make available to its security holders, as soon as reasonably practicable, an earnings statement covering the
period of at least twelve (12) months beginning with the first day of the Company’s first full calendar quarter after the effective date of the Registration Statement which satisfies the provisions of Section 11(a) of the Securities
Act and Rule 158 thereunder (or any successor rule promulgated thereafter by the Commission); 
 3.1.15    if the
Registration involves the Registration of Registrable Securities involving gross proceeds in excess of $50,000,000, use its reasonable efforts to make available senior executives of the Company to participate in customary “road show”
presentations that may be reasonably requested by the Underwriter in any Underwritten Offering; and 

3.1.16    otherwise, in good faith, cooperate reasonably with, and take such customary actions as may reasonably be
requested by the Holders, in connection with such Registration. 
 3.2    Registration Expenses. The Registration
Expenses of all Registrations shall be borne by the Company. It is acknowledged by the Holders that the Holders shall bear all incremental selling expenses relating to the sale of Registrable Securities, such as Underwriters’ commissions and
discounts, brokerage fees, Underwriter marketing costs and, other than as set forth in the definition of “Registration Expenses,” all reasonable fees and expenses of any legal counsel representing the Holders. 

3.3    Requirements for Participation in Underwritten Offerings. No person may participate in any Underwritten
Offering for equity securities of the Company pursuant to a Registration initiated by the Company hereunder unless such person (i) agrees to sell such person’s securities on the basis provided in any underwriting arrangements approved by
the Company and (ii) completes and executes all customary questionnaires, powers of attorney, indemnities, lock-up agreements, underwriting agreements and other customary documents as may be reasonably
required under the terms of such underwriting arrangements. 
 3.4    Suspension of Sales; Adverse Disclosure.
Upon receipt of written notice from the Company that a Registration Statement or Prospectus contains a Misstatement, each of the Holders shall forthwith discontinue disposition of Registrable Securities until he, she or it has received copies of a
supplemented or amended Prospectus correcting the Misstatement (it being understood that the Company hereby covenants to prepare and file such supplement or amendment as soon as practicable after the time of such notice), or until he, she or it is
advised in writing by the Company that the use of the Prospectus may be resumed. If the filing, initial effectiveness or continued use of a Registration Statement in respect of any Registration at any time would require the Company to make an
Adverse Disclosure or would require the inclusion in such Registration Statement of financial statements that are unavailable to the Company for reasons beyond the Company’s control, the Company may, upon giving prompt written notice of such
action to the Holders, delay the filing or initial effectiveness of, or suspend use of, such Registration Statement for the shortest period of time, but in no event more than ninety (90) days in any
12-month period, determined in good faith by the Company to be necessary for such purpose. In the event the Company exercises its rights under the preceding sentence, the


  
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Holders agree to suspend, immediately upon their receipt of the notice referred to above, their use of the Prospectus relating to any Registration in connection with any sale or offer to sell
Registrable Securities. The Company shall immediately notify the Holders of the expiration of any period during which it exercised its rights under this Section 3.4. 

3.5    Reporting Obligations. As long as any Holder shall own Registrable Securities, the Company, at all times
while it shall be a reporting company under the Exchange Act, covenants to file timely (or obtain extensions in respect thereof and file within the applicable grace period) all reports required to be filed by the Company after the date hereof
pursuant to Sections 13(a) or 15(d) of the Exchange Act and to promptly furnish the Holders with true and complete copies of all such filings. The Company further covenants that it shall take such further action as any Holder may reasonably
request, all to the extent required from time to time to enable such Holder to sell shares of the Common Stock held by such Holder without registration under the Securities Act within the limitation of the exemptions provided by Rule 144 promulgated
under the Securities Act (or any successor rule promulgated thereafter by the Commission), including providing any legal opinions. Upon the request of any Holder, the Company shall deliver to such Holder a written certification of a duly authorized
officer as to whether it has complied with such requirements. 
 ARTICLE IV 

INDEMNIFICATION AND CONTRIBUTION 

4.1    Indemnification. 

4.1.1    The Company agrees to indemnify, to the extent permitted by law, each Holder of Registrable Securities, its
officers, directors and agents and each person who controls such Holder (within the meaning of the Securities Act) against all losses, claims, damages, liabilities and
out-of-pocket expenses (including, without limitation reasonable outside attorneys’ fees) resulting from any untrue or alleged untrue statement of material fact
contained in any Registration Statement, Prospectus or preliminary Prospectus or any amendment thereof or supplement thereto or any omission or alleged omission of a material fact required to be stated therein or necessary to make the statements
therein not misleading, except insofar as the same are caused by or contained in any information or affidavit so furnished in writing to the Company by such Holder expressly for use therein. The Company shall indemnify the Underwriters, their
officers and directors and each person who controls such Underwriters (within the meaning of the Securities Act) to the same extent as provided in the foregoing with respect to the indemnification of the Holder. 

4.1.2    In connection with any Registration Statement in which a Holder of Registrable Securities is participating, such
Holder shall furnish to the Company in writing such information and affidavits as the Company reasonably requests for use in connection with any such Registration Statement or Prospectus and, to the extent permitted by law, shall indemnify the
Company, its directors, officers and agents and each person who controls the Company (within the meaning of the Securities Act) against all losses, claims, damages, liabilities and
out-of-pocket expenses (including, without limitation reasonable outside attorneys’ fees) resulting from any untrue or alleged untrue statement of material fact
contained in any Registration Statement, Prospectus or preliminary Prospectus or any amendment thereof or supplement thereto or any omission or alleged omission of a material fact required to be stated therein or necessary to make the statements
therein not misleading, but only to the extent that such untrue statement or omission is contained in any information or affidavit so furnished in writing by such Holder expressly for use therein; provided, however, that the
obligation to indemnify shall be several, not joint and several, among such Holders of Registrable Securities, and the liability of each such Holder of Registrable Securities shall be in proportion to and limited to the net proceeds received by such
Holder from the sale of Registrable Securities pursuant to such Registration Statement. The Holders of Registrable Securities shall indemnify the Underwriters, their officers, directors and each person who controls such Underwriters (within the
meaning of the Securities Act) to the same extent as provided in the foregoing with respect to indemnification of the Company. 

4.1.3    Any person entitled to indemnification herein shall (i) give prompt written notice to the indemnifying party
of any claim with respect to which he, she or it seeks indemnification (provided that the failure to give prompt notice shall not impair any person’s right to indemnification hereunder to the extent such failure has not materially prejudiced
the indemnifying party) and (ii) unless in such indemnified party’s reasonable judgment a conflict of interest between such indemnified and indemnifying parties may exist with respect to such claim, permit such indemnifying party to assume
the defense of such claim with counsel reasonably satisfactory to the indemnified party. If such defense is assumed, the indemnifying party shall not be subject to any liability for any settlement made by the indemnified party without its consent
(but such consent 

  
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shall not be unreasonably withheld). An indemnifying party who is not entitled to, or elects not to, assume the defense of a claim shall not be obligated to pay the fees and expenses of more than
one counsel for all parties indemnified by such indemnifying party with respect to such claim, unless in the reasonable judgment of any indemnified party a conflict of interest may exist between such indemnified party and any other of such
indemnified parties with respect to such claim. No indemnifying party shall, without the consent of the indemnified party, consent to the entry of any judgment or enter into any settlement which cannot be settled in all respects by the payment of
money (and such money is so paid by the indemnifying party pursuant to the terms of such settlement) or which settlement does not include as an unconditional term thereof the giving by the claimant or plaintiff to such indemnified party of a release
from all liability in respect to such claim or litigation. 
 4.1.4    The indemnification provided for under this
Agreement shall remain in full force and effect regardless of any investigation made by or on behalf of the indemnified party or any officer, director or controlling person of such indemnified party and shall survive the transfer of securities. The
Company and each Holder of Registrable Securities participating in an offering also agrees to make such provisions as are reasonably requested by any indemnified party for contribution to such party in the event the Company’s or such
Holder’s indemnification is unavailable for any reason. 
 4.1.5    If the indemnification provided
under Section 4.1 hereof from the indemnifying party is unavailable or insufficient to hold harmless an indemnified party in respect of any losses, claims, damages, liabilities and out-of-pocket expenses referred to herein, then the indemnifying party, in lieu of indemnifying the indemnified party, shall contribute to the amount paid or payable by the indemnified party as a result of
such losses, claims, damages, liabilities and out-of-pocket expenses in such proportion as is appropriate to reflect the relative fault of the indemnifying party and the
indemnified party, as well as any other relevant equitable considerations. The relative fault of the indemnifying party and indemnified party shall be determined by reference to, among other things, whether any action in question, including any
untrue or alleged untrue statement of a material fact or omission or alleged omission to state a material fact, was made by, or relates to information supplied by, such indemnifying party or indemnified party, and the indemnifying party’s and
indemnified party’s relative intent, knowledge, access to information and opportunity to correct or prevent such action; provided, however, that the liability of any Holder under this subsection 4.1.5 shall be
limited to the amount of the net proceeds received by such Holder in such offering giving rise to such liability. The amount paid or payable by a party as a result of the losses or other liabilities referred to above shall be deemed to include,
subject to the limitations set forth in subsections 4.1.1, 4.1.2 and 4.1.3 above, any legal or other fees, charges or
out-of-pocket expenses reasonably incurred by such party in connection with any investigation or proceeding. The parties hereto agree that it would not be just and
equitable if contribution pursuant to this subsection 4.1.5 were determined by pro rata allocation or by any other method of allocation, which does not take account of the equitable considerations referred to in this subsection
4.1.5. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution pursuant to this subsection 4.1.5 from any person who was not guilty of
such fraudulent misrepresentation. 
 ARTICLE V 

MISCELLANEOUS 

5.1    Notices. Any notice or communication under this Agreement must be in writing and given by (i) deposit
in the United States mail, addressed to the party to be notified, postage prepaid and registered or certified with return receipt requested, (ii) delivery in person or by courier service providing evidence of delivery, or
(iii) transmission by hand delivery, electronic mail or facsimile. Each notice or communication that is mailed, delivered, or transmitted in the manner described above shall be deemed sufficiently given, served, sent, and received, in the case
of mailed notices, on the third business day following the date on which it is mailed and, in the case of notices delivered by courier service, hand delivery, electronic mail or facsimile, at such time as it is delivered to the addressee (with the
delivery receipt or the affidavit of messenger) or at such time as delivery is refused by the addressee upon presentation. Any notice or communication under this Agreement must be addressed, if to the Company, to: Build Acquisition Corp. 3500
Jefferson, Suite 303, Austin, Texas 78731, Attention: Co-Chief Executive Officers, and, if to any Holder, at such Holder’s address as set forth in the Company’s books and records. Any party may
change its address for notice at any time and from time to time by written notice to the other parties hereto, and such change of address shall become effective thirty (30) days after delivery of such notice as provided in
this Section 5.1. 

  
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 5.2    Assignment; No Third Party Beneficiaries. 

5.2.1    This Agreement and the rights, duties and obligations of the Company hereunder may not be assigned or delegated by
the Company in whole or in part. 
 5.2.2    Prior to the expiration of the Founder Shares Lock-Up Period or the Private Placement Lock-Up Period, as the case may be, no Holder may assign or delegate such Holder’s rights, duties or obligations under this
Agreement, in whole or in part, except in connection with a transfer of Registrable Securities by such Holder to a Permitted Transferee but only if such Permitted Transferee agrees to become bound by the transfer restrictions set forth in this
Agreement. 
 5.2.3    This Agreement and the provisions hereof shall be binding upon and shall inure to the benefit of
each of the parties and its successors and the permitted assigns of the Holders, which shall include Permitted Transferees. 

5.2.4    This Agreement shall not confer any rights or benefits on any persons that are not parties hereto, other than as
expressly set forth in this Agreement and Section 5.2 hereof. 
 5.2.5    No assignment by any
party hereto of such party’s rights, duties and obligations hereunder shall be binding upon or obligate the Company unless and until the Company shall have received (i) written notice of such assignment as provided
in Section 5.1 hereof and (ii) the written agreement of the assignee, in a form reasonably satisfactory to the Company, to be bound by the terms and provisions of this Agreement (which may be accomplished by an addendum or
certificate of joinder to this Agreement). Any transfer or assignment made other than as provided in this Section 5.2 shall be null and void. 

5.3    Counterparts. This Agreement may be executed in multiple counterparts (including facsimile or PDF
counterparts), each of which shall be deemed an original, and all of which together shall constitute the same instrument, but only one of which need be produced. 

5.4    Governing Law; Venue. NOTWITHSTANDING THE PLACE WHERE THIS AGREEMENT MAY BE EXECUTED BY ANY OF THE PARTIES
HERETO, THE PARTIES EXPRESSLY AGREE THAT (1) THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED UNDER THE LAWS OF THE STATE OF NEW YORK, INCLUDING, WITHOUT LIMITATION, SECTIONS 5-1401 AND 5-1402 OF THE NEW YORK GENERAL OBLIGATIONS LAW AND NEW YORK CIVIL PRACTICE LAWS AND RULES 327(B), AS APPLIED TO AGREEMENTS AMONG NEW YORK RESIDENTS ENTERED INTO AND TO BE PERFORMED ENTIRELY WITHIN NEW YORK AND
(2) SUBJECT TO APPLICABLE LAW, THE VENUE FOR ANY ACTION TAKEN WITH RESPECT TO THIS AGREEMENT SHALL BE ANY STATE OR FEDERAL COURT IN NEW YORK COUNTY IN THE STATE OF NEW YORK. 

5.5    TRIAL BY JURY. EACH PARTY HERETO ACKNOWLEDGES AND AGREES THAT ANY CONTROVERSY WHICH MAY ARISE
UNDER THIS AGREEMENT IS LIKELY TO INVOLVE COMPLICATED AND DIFFICULT ISSUES, AND, THEREFORE, EACH SUCH PARTY HEREBY IRREVOCABLY AND UNCONDITIONALLY WAIVES TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY RIGHT SUCH PARTY MAY HAVE TO A TRIAL BY
JURY IN RESPECT TO ANY ACTION DIRECTLY OR INDIRECTLY ARISING OUT OF, UNDER OR IN CONNECTION WITH OR RELATING TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT. 

5.6    Amendments and Modifications. Upon the written consent of the Company and the Holders of at least a majority
in interest of the Registrable Securities at the time in question, compliance with any of the provisions, covenants and conditions set forth in this Agreement may be waived, or any of such provisions, covenants or conditions may be amended or
modified; provided, however, that notwithstanding the foregoing, any amendment hereto or waiver hereof that adversely affects one Holder, solely in his, her or its capacity as a holder of the shares of capital stock of the
Company, in a manner that is materially different from the other Holders (in such capacity) shall require the consent of the Holder so affected. No course of dealing between any Holder or the Company and any other party hereto or any failure or
delay on the part of a Holder or the Company in exercising any rights or remedies under this Agreement shall operate as a waiver of any rights or remedies of any Holder or the Company. No single or partial exercise of any rights or remedies under
this Agreement by a party shall operate as a waiver or preclude the exercise of any other rights or remedies hereunder or thereunder by such party. 

  
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 5.7    Other Registration Rights. The Company represents and
warrants that no person, other than a Holder of Registrable Securities, has any right to require the Company to register any securities of the Company for sale or to include such securities of the Company in any Registration filed by the Company for
the sale of securities for its own account or for the account of any other person. Further, the Company represents and warrants that this Agreement supersedes any other registration rights agreement or agreement with similar terms and conditions and
in the event of a conflict between any such agreement or agreements and this Agreement, the terms of this Agreement shall prevail. 

5.8    Term. This Agreement shall terminate with respect to any Holder on the date that such Holder no longer holds
any Registrable Securities. The provisions of Section 3.5 and Article IV shall survive any termination. 

5.9    Holder Information. Each Holder agrees, if requested in writing, to represent to the Company the total
number of Registrable Securities held by such Holder in order for the Company to make determinations hereunder. 
 [SIGNATURE PAGES FOLLOW]


  
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 IN WITNESS WHEREOF, the undersigned have caused this Agreement to be executed as of the date
first written above. 
  

					
	COMPANY:
	
	BUILD ACQUISITION CORP.
		
	By:	 	 /s/ Zeynep Young

		 	Name:	 	Zeynep Young
		 	Title:	 	Co-Chief Executive Officer
	
	HOLDERS:
	
	BUILD ACQUISITION SPONSOR LLC
		
	By:	 	 A. Lanham Napier

		 	Name:	 	A. Lanham Napier
		 	Title:	 	Authorized Signatory


  

	
	 /s/ A. Lanham Napier

	Name: A. Lanham Napier
	
	 /s/ Zeynep Young

	Name: Zeynep Young
	
	 /s/ Tanner Cerand

	Name: Tanner Cerand
	
	 /s/ Owen Van Natta

	Name: Owen Van Natta
	
	 /s/ Noam Ohana

	Name: Noam Ohana
	
	 /s/ James C. Weaver

	Name: James C. Weaver


 [Signature Page to Registration Rights Agreement]