Document:

EX-10.4

 Exhibit 10.4 

COMPANY HOLDERS SUPPORT AGREEMENT 

This Company Holders Support Agreement (this “Agreement”), dated as of March 17, 2021, is entered into by and among
Supernova Partners Acquisition Company, Inc., a Delaware corporation (“Acquiror”), OfferPad, Inc., a Delaware corporation (the “Company”), and certain of the stockholders of the Company, whose names appear on the
signature pages of this Agreement (such stockholders, the “Stockholders”, and Acquiror, the Company and the Stockholders, each a “Party”, and collectively, the “Parties”). 

RECITALS 
 WHEREAS,
concurrently herewith, Acquiror, the Company, Orchids Merger Sub, Inc., a Delaware corporation and direct, wholly owned subsidiary of Acquiror (“First Merger Sub”), and Orchids Merger Sub, LLC, a Delaware limited liability company
and direct, wholly owned subsidiary of Acquiror (“Second Merger Sub”), are entering into an Agreement and Plan of Merger (as amended, supplemented, restated or otherwise modified from time to time, the “Merger
Agreement”; capitalized terms used but not otherwise defined in this Agreement shall have the meanings ascribed to them in the Merger Agreement), pursuant to which (and subject to the terms and conditions set forth therein), (i) First
Merger Sub will merge with and into the Company (the “First Merger”), with the Company being the surviving corporation of the First Merger and (ii) immediately following the First Merger and as part of the same overall
transaction as the First Merger, the Company will merge with and into Second Merger Sub (the “Second Merger” and, together with the First Merger, the “Mergers”), with the Second Merger Sub being the surviving entity
of the Second Merger; 
 WHEREAS, as of the date hereof, each Stockholder is the sole record owner and “beneficial owner”
(as such term is used herein, within the meaning of Rule 13d-3 under the Securities Exchange Act of 1934, as amended (together with the rules and regulations promulgated thereunder, the “Exchange
Act”)) of, and has the sole power to dispose of and vote (or direct the voting of), the number of shares of Company Stock set forth opposite such Stockholder’s name on Schedule 1 attached hereto (such shares, together with
(1) any shares of Company Stock (or any securities convertible into or exercisable or exchangeable for Company Stock) of which such Stockholder has record or beneficial ownership as of the date hereof and that are not reflected on Schedule
1, (2) any additional shares of Company Stock (or any securities convertible into or exercisable or exchangeable for Company Stock) of which such Stockholder acquires record or beneficial ownership after the date hereof, including by Transfer
(as defined below), purchase, as a result of a stock dividend, stock split, recapitalization, combination, reclassification, exchange or change of such shares, or upon exercise or conversion of any securities, and (3) any additional shares of
Company Stock with respect to which such Stockholder has the right to vote through a proxy or otherwise, such Stockholder’s “Covered Shares”); 

WHEREAS, upon the consummation of the Mergers, each of the following agreements will terminate: (i) that certain Third Amended and
Restated Investor Rights Agreement, dated as of February 5, 2019, by and among the Company and the Preferred Holders (as defined therein), as amended by that certain Amendment No. 1 thereto, dated as of February 25, 2020; (ii) that certain Fourth
Amended and Restated Voting Agreement, dated as of April 16, 2020, by and 

 
among the Company and the Stockholders (as defined therein) (the “Voting Agreement”); (iii) that certain Third Amended and Restated Right of First Refusal and Co-Sale Agreement, dated as of February 5, 2019, by and among the Company, the Major Holders (as defined therein) and the Common Holders (as defined therein), as amended by that certain Amendment No. 1
thereto, dated as of February 25, 2020; (iv) that certain Letter Agreement Regarding Board Observation Rights, dated as of February 5, 2019, by and between the Company and Jerry Coleman; (v) that certain Letter Agreement Regarding
Board Observation Rights, dated as of February 25, 2020, by and between the Company and Ulysses Partners Designated Investments L.P.; and (vi) that certain Letter Agreement Regarding Approval Rights with respect to the Purchase Agreement
(as defined therein), dated as of April 9, 2020, by and between the Company and VSF Investments LLC (such agreements described in clauses (i)-(vi), collectively, the “Investment Agreements”); and 

WHEREAS, as a condition and inducement to the willingness of Acquiror to enter into the Merger Agreement, the Company and the
Stockholders are entering into this Agreement. 
 AGREEMENT 

NOW, THEREFORE, in consideration of the foregoing and the mutual covenants and agreements herein contained, and intending to be legally
bound hereby, Acquiror, the Company and each Stockholder hereby agree as follows: 
 1. Agreement to Vote. Prior to the Termination
Date (as defined below), each Stockholder, solely in his, her or its capacity as a stockholder or proxy holder of the Company, irrevocably and unconditionally agrees to validly execute and deliver to the Company in respect of all of the
Stockholder’s Covered Shares entitled to vote or consent on matters put to a vote or consent, as applicable, of the Company’s stockholders (such Covered Shares, each Stockholder’s “Voting Covered Shares”), as soon as
reasonably practicable after the Registration Statement is declared effective under the Securities Act, and in any event within 48 hours thereafter, a written consent in respect of all of the Stockholder’s Voting Covered Shares approving the
Merger Agreement and the Transactions. In addition, prior to the Termination Date, each Stockholder, in his, her or its capacity as a stockholder or proxy holder of the Company, irrevocably and unconditionally agrees that, at any other meeting of
the stockholders of the Company (whether annual or special and whether or not an adjourned or postponed meeting, however called and including any adjournment or postponement thereof) and in connection with any written consent of stockholders of the
Company, such Stockholder shall, and shall cause each other holder of record of any of such Stockholder’s Voting Covered Shares to: 

(a) when such meeting is held, appear at such meeting or otherwise cause the Stockholder’s Voting Covered Shares to be counted as present
thereat for the purpose of establishing a quorum; 
 (b) vote (or execute and return an action by written consent), or cause to be voted at
such meeting (or validly execute and return and cause such consent to be granted with respect to), all of such Stockholder’s Voting Covered Shares owned as of the record date for such meeting (or the date that any written consent is executed by
such Stockholder) in favor of the Transactions and the adoption of the Merger Agreement and any other matters necessary or reasonably requested by the Company or Acquiror for consummation of the Transactions; 

  
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 (c) in any other circumstances upon which a consent or other approval is required under the
Company’s Governing Documents or the Investment Agreements or otherwise sought with respect to the Merger Agreement or the Transactions, including adopting and approving the Pre-Closing Restructuring Plan
and the transactions contemplated thereby, vote, consent or approve (or cause to be voted, consented or approved) all of such Stockholder’s Voting Covered Shares in favor thereof; and 

(d) vote (or execute and return an action by written consent), or cause to be voted at such meeting (or validly execute and return and cause
such consent to be granted with respect to), all of such Stockholder’s Voting Covered Shares against (i) any Acquisition Transaction or any proposal relating to an Acquisition Transaction (in each case, other than the Transactions); (ii)
any merger agreement or merger (other than the Merger Agreement and the Mergers), consolidation, combination, sale of substantially all assets, reorganization, recapitalization, dissolution, liquidation or winding up of or by the Company; and
(iii) any proposal, action or agreement that would or would reasonably be expected to (A) impede, frustrate, prevent or nullify any provision of this Agreement, the Merger Agreement or the Mergers, (B) result in a breach in any
respect of any covenant, representation, warranty or any other obligation or agreement of any party under the Merger Agreement or (C) result in any of the conditions set forth in Article X of the Merger Agreement not being fulfilled. 

The obligations of each Stockholder specified in this Section 1 shall apply whether or not the Transactions are
recommended by the Board of Directors of the Company or the Board of Directors of the Company has previously recommended the Transactions but changed such recommendation. 

2. No Inconsistent Agreements. Each Stockholder hereby covenants and agrees that such Stockholder shall not (i) enter into any
voting agreement, voting trust or other agreement with respect to any of such Stockholder’s Covered Shares that is inconsistent with such Stockholder’s obligations pursuant to this Agreement, (ii) grant a proxy, power of attorney or
similar right with respect to any of such Stockholder’s Covered Shares that is inconsistent with such Stockholder’s obligations pursuant to this Agreement, or (iii) enter into any other agreement or undertaking that is otherwise
inconsistent with, or would reasonably be expected to interfere with, or would reasonably be expected to prohibit or prevent it from satisfying, its obligations pursuant to this Agreement. 

3. Termination; Non-Survival of Representations and Warranties. 

(a) This Agreement shall terminate upon the earlier to occur of (i) the First Effective Time and (ii) the termination of the Merger
Agreement in accordance with its terms in circumstances where the Closing does not occur (the earlier such date under clause (i) or (ii) being referred to herein as the “Termination Date”), and upon such termination, this
Agreement shall forthwith become void and have no further force or effect, without any liability on the part of any Party; provided, that (A) no such termination shall relieve any Party of any liability for its pre-termination fraud or material breach of this Agreement, (B) this Section 3(a), Section 5(d), Section 5(e), Section 5(f), Section 5(i),
Section 7, and Sections 9 through 21 shall survive any such termination and (C) Section 5(c) shall survive any such termination under clause (i) above until the expiration of the Lock-Up Period (as defined in the Acquiror Bylaws). 

  
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 (b) None of the representations or warranties contained in this Agreement or in any
certificate or other writing delivered pursuant hereto shall survive the Closing. 
 4. Representations and Warranties of the
Stockholders. In compliance with the terms of Section 3.3 of the Voting Agreement, the representations and warranties in this Section 4 are provided voluntarily by each Stockholder. Each Stockholder hereby represents and
warrants (severally and not jointly and as to itself only) to the Acquiror and the Company as follows: 
 (a) Such Stockholder is the sole
record owner and beneficial owner (within the meaning of Rule 13d-3 under the Exchange Act) of, and has good, valid and marketable title to, or has a valid proxy to vote, such Stockholder’s Covered
Shares, free and clear of any Liens (other than as created by this Agreement or the organizational documents of the Company (including, for the purposes hereof, any agreements between or among stockholders of the Company)). As of the date hereof,
other than the Covered Shares set forth opposite such Stockholder’s name on Schedule 1, such Stockholder does not own beneficially or of record any shares of Company Stock (or any securities convertible into shares of Company Stock) or
any interest therein. 
 (b) Such Stockholder, in each case except as provided in this Agreement or, before giving effect to
Section 5(j), the Investment Agreements or the Governing Documents of the Company, (i) has full voting power, full power of disposition and full power to issue instructions with respect to the matters set forth herein, whether by
ownership or by proxy, in each case, with respect to such Stockholder’s Covered Shares, (ii) has not entered into any voting agreement or voting trust, and has no knowledge and is not aware of any such voting agreement or voting trust in
effect with respect to any of such Stockholder’s Covered Shares, that is inconsistent with such Stockholder’s obligations pursuant to this Agreement, (iii) has not granted a proxy or power of attorney with respect to any of such
Stockholder’s Covered Shares that is inconsistent with such Stockholder’s obligations pursuant to this Agreement, and has no knowledge and is not aware of any such proxy or power of attorney in effect, and (iv) has not entered into
any agreement or undertaking that is otherwise inconsistent with, or would interfere with, or prohibit or prevent it from satisfying, its obligations pursuant to this Agreement, and has no knowledge and is not aware of any such agreement or
undertaking. 
 (c) Such Stockholder affirms that (i) if the Stockholder is a natural person, he or she has all the requisite power and
authority and has taken all action necessary in order to execute and deliver this Agreement, to perform his or her obligations hereunder and to consummate the transactions contemplated hereby, and (ii) if the Stockholder is not a natural
person, it (A) is a legal entity duly organized, validly existing and, to the extent such concept is applicable, in good standing under the Laws of the jurisdiction of its organization, and (B) has all requisite corporate or other power
and authority to, and has taken all corporate or other action necessary in order to, execute, deliver and perform its obligations under this Agreement and to consummate the transactions contemplated hereby. This Agreement has been duly executed and
delivered by such Stockholder and, subject to the due execution and delivery of this Agreement 

  
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by each of the Company and Acquiror, constitutes a legally valid and binding agreement of such Stockholder enforceable against such Stockholder in accordance with the terms hereof (except as
enforceability may be limited by bankruptcy Laws or other similar Laws affecting creditors’ rights and general principles of equity affecting the availability of specific performance and other equitable remedies). 

(d) Other than the filings, notices and reports pursuant to, in compliance with or required to be made under the Exchange Act, no filings,
notices, reports, consents, registrations, approvals, permits, waivers, expirations of waiting periods or authorizations are required to be obtained by such Stockholder from, or to be given by such Stockholder to, or to be made by such Stockholder
with, any Governmental Authority in connection with the execution, delivery and performance by such Stockholder of this Agreement, the consummation of the transactions contemplated hereby or the Transactions. 

(e) The execution, delivery and performance of this Agreement by such Stockholder does not, and the consummation of the transactions
contemplated hereby and the Transactions will not, constitute or result in (i) a breach or violation of, or a default under, the Governing Documents of such Stockholder (if such Stockholder is not a natural person) or the rights of such
Stockholder’s spouse or domestic partner (if such Stockholder is a natural person and has a spouse or domestic partner, as applicable), (ii) with or without notice, lapse of time or both, a breach or violation of, a termination (or right of
termination) of or a default under, the loss of any benefit under, the creation, modification or acceleration of any obligations under or the creation of a Lien on any of the properties, rights or assets of such Stockholder pursuant to any Contract
binding upon such Stockholder or, assuming (solely with respect to performance of this Agreement and the transactions contemplated hereby), compliance with the matters referred to in Section 4(d), under any applicable Law to which such
Stockholder is subject, (iii) any change in the rights or obligations of any party under any Contract legally binding upon such Stockholder or (iv) any violation of applicable Law, except, in the case of clauses (ii), (iii) or
(iv) directly above, for any such breach, violation, termination, default, creation, acceleration or change that would not, individually or in the aggregate, reasonably be expected to prevent or materially delay or impair such
Stockholder’s ability to perform its obligations hereunder or to consummate the transactions contemplated hereby or the Transactions. 

(f) As of the date of this Agreement, there is no Action pending against such Stockholder or, to the knowledge of such Stockholder, threatened
against such Stockholder that, in any manner, questions the beneficial or record ownership of the Stockholder’s Covered Shares or the validity of this Agreement, or challenges or seeks to prevent, enjoin or materially delay the performance by
such Stockholder of its obligations under this Agreement. 
 (g) The Stockholder is a sophisticated investor and has adequate information
concerning the business and financial condition of Acquiror and the Company to make an informed decision regarding this Agreement and the Transactions and has independently and based on such information as the Stockholder has deemed appropriate made
its own analysis and decision to enter into this Agreement. The Stockholder acknowledges that Acquiror and the Company have not made and do not make any representation or warranty, whether express or implied, of any kind or character. The
Stockholder acknowledges that the agreements contained herein are irrevocable. 

  
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 (h) Such Stockholder understands and acknowledges that Acquiror is entering into the Merger
Agreement in reliance upon such Stockholder’s execution and delivery of this Agreement and the representations, warranties, covenants and other agreements of such Stockholder contained herein. 

(i) No investment banker, broker, finder or other intermediary is entitled to any broker’s, finder’s, financial advisor’s or
other similar fee or commission for which Acquiror or the Company is or could be liable in connection with the Merger Agreement or this Agreement or any of the respective transactions contemplated hereby or thereby, in each case based upon
arrangements made by or on behalf of such Stockholder in his, her or its capacity as a stockholder. 
 5. Certain Covenants of the
Stockholders. In compliance with the terms of Section 3.3 of the Voting Agreement, the Stockholders are not required to agree to any restrictive covenant in connection with the Transactions and any agreement of a Stockholder to any
restrictive covenant is provided voluntarily by such Stockholder. 
 (a) No Solicitation. Prior to the Termination Date, each
Stockholder shall not take, and shall direct its Affiliates and Representatives not to take, whether directly or indirectly, any action to (i) solicit, initiate, continue or engage in discussions or negotiations with, or enter into any
agreement with, or knowingly encourage, respond to, or provide information to, any Person (other than Acquiror, the Company and/or any of their respective Affiliates or Representatives in respect of the Transactions) concerning any Acquisition
Transaction, (ii) commence, continue or renew any due diligence investigation regarding, or that is reasonably likely to give rise to or result in, any offer, inquiry, proposal or indication of interest, written or oral, with respect to, or
which is reasonably likely to give rise to or result in, an Acquisition Transaction, or (iii) solicit, initiate, continue or engage in discussions or negotiations with, or enter into any agreement with, or encourage, respond to, provide
information to or commence due diligence with respect to, any Person (other than Acquiror, the Company and/or any of their respective Affiliates or Representatives with respect to the Transactions) concerning, relating to or which is intended or is
reasonably likely to give rise to or result in, any Business Combination Proposal other than as contemplated by the Transactions; provided, that, in the case of clauses (ii) and (iii), the execution, delivery and performance of this
Agreement and the transactions contemplated hereby shall not be deemed a violation of this Section 5(a). Such Stockholder shall, and shall direct its Affiliates and Representatives to, immediately cease any and all existing discussions
or negotiations with any Person conducted prior to the date hereof with respect to, or which is reasonably likely to give rise to or result in, an Acquisition Proposal or a Business Combination Proposal. Notwithstanding the foregoing, (A) such
Stockholder, in its capacity as such, shall not be responsible for the actions of the Company or the Board of Directors of the Company (or any committee thereof), any subsidiary of the Company, any other stockholder of the Company, or any officers,
directors (in their capacity as such), employees and professional advisors of any of the foregoing (collectively, the “Company Related Parties”), (B) such Stockholder, in its capacity as such, makes no representations or warranties
with respect to the actions of any of the Company Related Parties, and (C) any breach by the Company of its obligations under Section 9.03(a) of the Merger Agreement shall not, in and of itself, be considered a breach of this
Section 5(a) (it being understood that, for the avoidance of doubt, such Stockholder or his, her or its Representatives shall remain responsible for any breach by such Stockholder or his, her or its Representatives of this
Section 5(a)). 

  
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 (b) No Transfers Prior to Termination Date. Each Stockholder shall not, prior to the
Termination Date (except, in each case, pursuant to the Merger Agreement), (i) directly or indirectly sell, transfer, hypothecate, pledge, encumber, assign, hedge, swap, convert or otherwise dispose of (including by merger (including by conversion
into securities or other consideration), by tendering into any tender or exchange offer, by testamentary disposition, by operation of Law or otherwise), either voluntarily or involuntarily, any of its Covered Shares, (ii) enter into any
Contract or option with respect to any transaction specified in clause (i) or any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of any of its Covered Shares, whether any
such transaction is to be settled by delivery of such securities, in cash or otherwise, or (iii) publicly announce any intention to effect any transaction specified in clauses (i) or (ii) (any transaction specified in clauses (i), (ii) or
(iii), a “Transfer”); provided, however, that the foregoing shall not prohibit (A) a Transfer to an Affiliate of the Stockholder or to another Stockholder of the Company that is a party to this Agreement and bound
by the terms and obligations hereof or (B) in the case of Founder, a “Permitted Transfer” as defined in the Acquiror Charter (each, a “Permitted Transfer”); provided, further, that any Permitted Transfer
shall be permitted only if, as a precondition to such Transfer, the transferee agrees in a writing, reasonably satisfactory in form and substance to Acquiror, to assume all of the obligations of the transferring Stockholder under, and be bound by
all of the terms of, this Agreement; provided, further, that any Transfer permitted under this Section 5(b) shall not relieve the transferring Stockholder of its obligations under this Agreement. Any Transfer in violation
of this Section 5(b) shall be null and void. 
 (c) Post-Closing Lock-Up. Each
Stockholder hereby acknowledges that it has read the Acquiror Bylaws, including Section 7.12 thereof, and understands that such section provides that certain of such Stockholder’s Covered Shares will be subject to Transfer restrictions
(i.e., a “lock-up”) following the Closing, as and to the extent set forth therein. Accordingly, each Stockholder hereby agrees to be bound by and comply with Section 7.12 of the Acquiror
Bylaws as if such section was set forth herein and made a part hereof. Notwithstanding anything to the contrary herein, to the extent the Board of Directors of the Acquiror waives or repeals, or otherwise relaxes, any of the lock-up restrictions set forth in Section 7.12 of the Acquiror Bylaws (whether acting pursuant to Section 7.12(iii) of the Acquiror Bylaws or otherwise), such
lock-up restrictions shall be identically waived, repealed or relaxed, as applicable, with respect to the Stockholders. 

(d) No Actions to Breach Agreement. Each Stockholder shall not take any action that would make any representation or warranty of such
Stockholder contained herein untrue or incorrect or have the effect of preventing or disabling such Stockholder from performing its obligations under this Agreement. 

(e) Maintenance of Records. Each Stockholder hereby authorizes Acquiror and the Company to maintain a copy of this Agreement at either
its executive office or registered office. 

  
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 (f) Binding Effect of Merger Agreement. Each Stockholder hereby acknowledges that it
has read the Merger Agreement and this Agreement and has had the opportunity to consult with its tax, legal and other advisors with respect thereto and hereto. Each Stockholder shall be bound by and comply with Section 9.05 (Confidentiality;
Publicity) of the Merger Agreement (and any relevant definitions contained in any such sections) as if such Stockholder was an original signatory to the Merger Agreement with respect to such provisions. 

(g) Closing Date Deliverables. On the Closing Date, each Stockholder that is requested by the Company to execute the Registration Rights
Agreement shall deliver to Acquiror and the Company a duly executed copy of the Registration Rights Agreement, in substantially the form attached as Exhibit C to the Merger Agreement. 

(h) Drag-Along Rights. Each Stockholder shall promptly take, or cause to be taken, all actions, and cooperate with other parties, to
comply with all aspects of Section 3 of the Voting Agreement with respect to the Mergers and the Transactions. 
 (i) No Challenges;
Waiver of Appraisal Rights. Each Stockholder shall not commence, join in, facilitate, assist or encourage, and shall take all actions necessary to opt out of any class in any class action with respect to, any claim, derivative or otherwise,
against any of the Acquiror Parties, the Company, the Sponsor, any of their respective Affiliates or any of the respective Representatives (including directors, officers and employees) of the foregoing Persons, or any of the respective successors or
assigns of any of the foregoing Persons, challenging the validity of, or seeking to enjoin the operation of, any provision of this Agreement or alleging a breach of any fiduciary duty of any Person in connection with the evaluation, negotiation or
entry into the Merger Agreement or any other Transaction Agreement or the consummation of the Transactions. Each stockholder hereby irrevocably and unconditionally waives, and agrees not to assert, exercise or perfect (or attempt to exercise, assert
or perfect), any rights of appraisal or rights to dissent from the Mergers or appraisal or dissenters’ rights that it may at any time have under applicable Laws, including Section 262 of the DGCL. 

(j) Termination of Affiliate Agreements and Certain Other Agreements. Each Stockholder, by this Agreement with respect to its Covered
Shares, severally and not jointly, hereby agrees to take all action necessary to terminate, subject to and effective immediately prior to the Closing, (a) all Affiliate Agreements to which such Stockholder is party (including the Investment
Agreements) other than those that are set forth on Section 7.07 of the Company Disclosure Letter (a redacted version of which, showing only the surviving Affiliate Agreements applicable to such Stockholder, has previously been reviewed by such
Stockholder); and (b) any rights under any letter or agreement providing for redemption rights, put rights, purchase rights or other similar rights not generally available to stockholders of the Company. 

(k) Update of Schedule 1. If any Stockholder acquires record or beneficial ownership of any Covered Shares following the date hereof (or
becomes aware, following the date hereof, of its record or beneficial ownership of any Covered Shares as of the date hereof, which shares are not already set forth on Schedule 1), such Stockholder shall promptly notify the Company and
Acquiror in writing (email being sufficient), and Schedule 1 shall be updated to reflect such Stockholder’s ownership of such additional Covered Shares. 

  
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 6. Further Assurances. From time to time, at Acquiror’s request and without
further consideration, each Stockholder shall execute and deliver such additional documents and take all such further action as may be necessary or reasonably requested to effect the actions and consummate the Transactions and the transactions
contemplated hereby. 
 7. Disclosure. Such Stockholder hereby authorizes the Company and Acquiror to publish and disclose in any
announcement or disclosure relating to the Transactions, including any such announcement or disclosure required or requested by the SEC (or as otherwise required or requested pursuant to any applicable Laws or any other Governmental Authorities),
such Stockholder’s identity and ownership of the Covered Shares and the nature of such Stockholder’s obligations under this Agreement and, if deemed appropriate by Acquiror or the Company, a copy of this Agreement. Each Stockholder will
promptly provide any information reasonably requested in writing by Acquiror or the Company for any regulatory application or filing made or approval sought in connection with the transactions contemplated by the Merger Agreement (including filings
with the SEC). 
 8. Changes in Capital Stock. In the event (i) of a stock split, stock dividend or distribution, or any change
in Company Stock by reason of any split-up, reverse stock split, recapitalization, combination, reclassification, exchange of shares or the like, (ii) the Stockholder purchases or otherwise acquires
beneficial ownership of any Company Stock or (iii) the Stockholder acquires the right to vote or share in the voting of any Company Stock, the term “Covered Shares” shall be deemed to refer to and include such shares as well as all
such stock dividends and distributions and any securities into which or for which any or all of such shares may be changed or exchanged or which are received in such transaction. 

9. Amendment and Modification. This Agreement may not be amended, modified or supplemented in any manner, whether by course of conduct
or otherwise, except by an instrument in writing signed by Acquiror, the Company and each Stockholder charged with such amendment, modification or supplement. 

10. Waiver. No failure or delay by any Party exercising any right, power or privilege hereunder shall operate as a waiver thereof nor
shall any single or partial exercise thereof preclude any other or further exercise thereof or the exercise of any other right, power or privilege. The rights and remedies of the Parties hereunder are cumulative and are not exclusive of any rights
or remedies which they would otherwise have hereunder. Any agreement on the part of a Party to any such waiver shall be valid only if set forth in a written instrument executed and delivered by such Party. 

11. Notices. All notices and other communications hereunder shall be in writing and shall be deemed given if delivered personally, by
email (with confirmation of receipt) or sent by a nationally recognized overnight courier service, such as Federal Express, to the Parties at the following addresses (or at such other address for a Party as shall be specified by like notice made
pursuant to this Section 11): 
 if to the Stockholder, to the address or email address set forth opposite such
Stockholder’s name on Schedule 1, or in the absence of such address or email address being set forth on Schedule 1, the address (including email) set forth in the Company’s books and records, 

  
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 with a copy (which shall not constitute notice) to: 

Latham & Watkins LLP 

885 Third Avenue 
 New York, New
York 10022 
 Attn:    Justin Hamill; Josh Dubofsky 

Email: Justin.Hamill@lw.com; Josh.Dubofsky@lw.com 

if to the Company, to it at: 

OfferPad, Inc. 
 2150 E Germann
Rd, Suite 1 
 Chandler, AZ 85286 

Attn:   Benjamin Aronovitch, Chief Legal Officer 

Email: benjamin.aronovitch@offerpad.com 

with a copy (which shall not constitute notice) to: 

Latham & Watkins LLP 

885 Third Avenue 
 New York, New
York 10022 
 Attn:    Justin Hamill; Josh Dubofsky 

Email: Justin.Hamill@lw.com; josh.dubofsky@lw.com 

if to Acquiror prior to the Closing, to it at: 

Supernova Partners Acquisition Company, Inc. 

4301 50th St. NW 
 Suite 300,
PMB 1044 
 Washington, D.C. 20016 

Attention: Robert Reid, CEO; Michael Clifton, CFO 

Email: robert@supernovaspac.com; michael@supernovaspac.com 

with a copy (which shall not constitute notice) to: 

Simpson Thacher & Bartlett LLP 

900 G Street, NW 
 Washington,
D.C. 20001 
 Attn: Jonathan L. Corsico 

E-mail: jonathan.corsico@stblaw.com 

and 

  
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Simpson Thacher & Bartlett LLP 
 425 Lexington Ave. 

New York, NY 10017 
 Attn:
    Michael Wolfson 
 E-mail: mwolfson@stblaw.com 

if to Acquiror after the Closing, to it at: 

Supernova Partners Acquisition Company, Inc. 

2150 E Germann Rd, Suite 1 

Chandler, AZ 85286 
 Attn:
  Benjamin Aronovitch, Chief Legal Officer 
 Email: benjamin.aronovitch@offerpad.com 

In addition to the foregoing, in the case of any pre-Closing notices sent by any Stockholder to any
other Stockholder or the Company, or sent by the Company to any Stockholder, copies shall also be sent to Acquiror (to the person specified to receive pre-Closing notices on behalf of Acquiror) and to Simpson
Thacher & Bartlett LLP (to the persons referenced above). 
 12. No Ownership Interest. Nothing contained in this Agreement
shall be deemed to vest in Acquiror any direct or indirect ownership or incidence of ownership of or with respect to the Covered Shares of any Stockholder. All rights, ownership and economic benefits of and relating to the Covered Shares of each
Stockholder shall remain vested in and belong to such Stockholder, and Acquiror shall have no authority to direct any Stockholder in the voting or disposition of any of such Stockholder’s Covered Shares, except as otherwise provided herein.

 13. Entire Agreement; Time of Effectiveness. This Agreement and the Merger Agreement constitute the entire agreement and
understanding, and supersede all prior agreements and understandings, both written and oral, between the Parties with respect to the subject matter hereof. 

14. No Third-Party Beneficiaries. The Stockholder hereby agrees that its representations, warranties and covenants set forth herein are
solely for the benefit of Acquiror and the Company in accordance with and subject to the terms of this Agreement, and this Agreement is not intended to, and does not, confer upon any Person other than the Parties, any rights or remedies hereunder,
including the right to rely upon the representations, warranties and covenants set forth herein, and the Parties hereby further agree that this Agreement may only be enforced against, and any Action that may be based upon, arise out of or relate to
this Agreement, or the negotiation, execution or performance of this Agreement, may only be made against, the Persons expressly named as parties to this Agreement. 

15. Governing Law and Venue; Service of Process; Waiver of Jury Trial. 

(a) This Agreement, and all claims or causes of action based upon, arising out of, or related to this Agreement or the transactions
contemplated hereby, shall be governed by, and construed in accordance with, the internal Laws of the State of Delaware, including its statute of limitations, without giving effect to principles or rules of conflict of laws to the extent such
principles or rules would require or permit the application of the Laws or statute of limitations of another jurisdiction. 

  
 11 

 (b) Any Action based upon, arising out of or related to this Agreement or the transactions
contemplated hereby may only be brought in the Court of Chancery of the State of Delaware or, if such court lacks jurisdiction, the state and federal courts in the State of Delaware, and each of the Parties irrevocably submits to the exclusive
jurisdiction of each such court in any such Action, waives any objection it may now or hereafter have to personal jurisdiction, venue or to convenience of forum, agrees that all claims in respect of the Action shall be heard and determined only in
any such court, and agrees not to bring any Action arising out of or relating to this Agreement or the transactions contemplated hereby in any other court. Nothing herein contained shall be deemed to affect the right of any Party to serve process in
any manner permitted by Law or to commence legal proceedings or otherwise proceed against any other Party in any other jurisdiction, in each case, to enforce judgments obtained in any Action brought pursuant to this Section 15(b). 

(c) EACH OF THE PARTIES HEREBY KNOWINGLY, INTENTIONALLY, VOLUNTARILY AND IRREVOCABLY WAIVES ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY ACTION
BASED UPON, ARISING OUT OF OR RELATED TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY. 
 16. Assignment; Successors.
Neither this Agreement nor any of the rights, interests or obligations hereunder shall (a) be assigned by any of the Stockholders, in whole or in part (whether by operation of Law or otherwise), without the prior written consent of Acquiror and
the Company or (b) be assigned by Acquiror or the Company, in whole or in part (whether by operation of law or otherwise), without the prior written consent of the Company (in the case of an attempted assignment by Acquiror) or Acquiror (in the
case of an attempted assignment by the Company). Any such assignment without such consent shall be null and void. This Agreement shall be binding upon, inure to the benefit of and be enforceable by the Parties and their respective successors and
permitted assigns. 
 17. Enforcement. The Parties agree that irreparable damage (for which monetary damages, even if available, would
not be an adequate remedy) would occur, and that the Parties would not have any adequate remedy at law, in the event that any of the provisions of this Agreement were not performed in accordance with their specific terms or were otherwise breached.
It is accordingly agreed that the Parties shall be entitled to specific performance, an injunction or injunctions, or other equitable relief to prevent breaches or threatened breaches of this Agreement and to enforce specifically the terms and
provisions of this Agreement, including each Stockholder’s obligations under Section 1, without proof of actual damages or otherwise (and each Party hereby waives any requirement for the securing or posting of any bond in connection
with such remedy), this being in addition to any other remedy to which they are entitled at Law or in equity. Each Party acknowledges and agrees that the right of specific enforcement is an integral part of the transactions contemplated hereby and
that, without such right, none of the Parties would have entered into this Agreement. Each Party agrees that it will not oppose the granting of specific performance and other equitable relief on the basis that the other Parties have an adequate
remedy at Law. 

  
 12 

 18. Severability. If any term or other provision of this Agreement is held by a court
of competent jurisdiction or other authority to be invalid, void, unenforceable or against its regulatory policy, the remainder of the terms and provisions of this Agreement shall remain in full force and effect and shall in no way be affected,
impaired or invalidated. Upon such a determination, the Parties shall negotiate in good faith to modify this Agreement so as to effect the original intent of the Parties as closely as possible in an acceptable manner in order that the transactions
contemplated hereby be consummated as originally contemplated to the fullest extent possible. 
 19. Counterparts. This Agreement may
be executed in one or more counterparts, all of which shall be considered one and the same agreement, it being understood that each Party need not sign the same counterpart. Signatures delivered electronically or by facsimile shall be deemed to be
original signatures. 
 20. Interpretation and Construction. The words “hereof,” “herein” and
“hereunder” and words of like import used in this Agreement shall refer to this Agreement as a whole and not to any particular provision of this Agreement. The descriptive headings used herein are inserted for convenience of reference only
and are not intended to be part of or to affect the meaning or interpretation of this Agreement. References to Sections and Schedules are to Sections and Schedules of this Agreement, respectively, unless otherwise specified. Any singular term in
this Agreement shall be deemed to include the plural, and any plural term the singular. The definitions contained in this Agreement are applicable to the masculine as well as to the feminine and neuter genders of such term. Whenever the words
“include,” “includes” or “including” are used in this Agreement, they shall be deemed to be followed by the words “without limitation,” whether or not they are in fact followed by those words or words of like
import. “Writing,” “written” and comparable terms refer to printing, typing and other means of reproducing words (including electronic media) in a visible form. References to any statute shall be deemed to refer to such statute
as amended from time to time and to any rules or regulations promulgated thereunder. References to any person include the successors and permitted assigns of that person. References from or through any date mean, unless otherwise specified, from and
including such date or through and including such date, respectively. In the event an ambiguity or question of intent or interpretation arises, this Agreement will be construed as if drafted jointly by the Parties, and no presumption or burden of
proof will arise favoring or disfavoring any Party by virtue of the authorship of any of the provisions of this Agreement. The term “or” is not exclusive. 

21. Capacity as a Stockholder or Proxy Holder. Notwithstanding anything herein to the contrary, each Stockholder is signing this
Agreement solely in such Stockholder’s capacity as a stockholder of the Company, and not in any other capacity, and this Agreement shall not limit, prevent or otherwise affect the actions of such Stockholder or any Affiliate or Representative
thereof, or any of their respective Affiliates, in his or her capacity, if applicable, as an officer or director of the Company (or any Subsidiary of the Company) or any other Person, including in the exercise of his or her fiduciary duties as a
director or officer of the Company or any Subsidiary of the Company. No Stockholder shall be liable or responsible for any breach, default, or violation of any representation, warranty, covenant or agreement hereunder by any other Stockholder that
is also a Party and each Stockholder shall solely be required to perform its obligations hereunder in its individual capacity. 
 [The
remainder of this page is intentionally left blank.] 

  
 13 

 IN WITNESS WHEREOF, the Parties have caused this Agreement to be executed (where applicable,
by their respective officers or other authorized Persons thereunto duly authorized) as of the date first written above. 
  

			
	
	SUPERNOVA PARTNERS ACQUISITION COMPANY, INC.
		
	By:	 	 /s/ Michael S. Clifton

	Name:	 	Michael S. Clifton
	Title:	 	Chief Financial Officer
	
	OFFERPAD, INC.
		
	By:	 	 /s/ Brian Bair

	Name:	 	Brian Bair
	Title:	 	Chief Executive Officer & Founder

 [Signature Page to Company Holders Support Agreement] 

 IN WITNESS WHEREOF, the Parties have caused this Agreement to be executed (where applicable,
by their respective officers or other authorized Persons thereunto duly authorized) as of the date first written above. 
  

			
	FIRST AMERICAN FINANCIAL CORPORATION
		
	By:	 	 /s/ Kenneth D. DeGiorgio

	Name:	 	Kenneth D. DeGiorgio
	Title:	 	Executive Vice President

 [Signature Page to Company Holders Support Agreement] 

 IN WITNESS WHEREOF, the Parties have caused this Agreement to be executed (where applicable,
by their respective officers or other authorized Persons thereunto duly authorized) as of the date first written above. 
  

			
	 LL CAPITAL PARTNERS I, L.P.

		
	By:	 	 /s/ Paul A. Frick

	Name:	 	Paul A. Frick
	Title:	 	Vice President

  
 [Signature Page to
Company Holders Support Agreement] 

 IN WITNESS WHEREOF, the Parties have caused this Agreement to be executed (where applicable,
by their respective officers or other authorized Persons thereunto duly authorized) as of the date first written above. 
  

			
	 SIF V, LLC

		
	By:	 	 /s/ Paul A. Frick

	Name:	 	Paul A. Frick
	Title:	 	Vice President of the Managing Member

  
 [Signature Page to
Company Holders Support Agreement] 

 IN WITNESS WHEREOF, the Parties have caused this Agreement to be executed (where applicable,
by their respective officers or other authorized Persons thereunto duly authorized) as of the date first written above. 
  

			
	By:	 	 /s/ Brian Bair

	Name:	 	Brian Bair

  
 [Signature Page to
Company Holders Support Agreement] 

 IN WITNESS WHEREOF, the Parties have caused this Agreement to be executed (where applicable,
by their respective officers or other authorized Persons thereunto duly authorized) as of the date first written above. 
  

			
	By:	 	 /s/ Vaughn Bair

	Name:	 	Vaughn Bair

  
 [Signature Page to
Company Holders Support Agreement] 

 IN WITNESS WHEREOF, the Parties have caused this Agreement to be executed (where applicable,
by their respective officers or other authorized Persons thereunto duly authorized) as of the date first written above. 
  

			
	By:	 	 /s/ Casey Bair

	Name:	 	Casey Bair

  
 [Signature Page to
Company Holders Support Agreement] 

 IN WITNESS WHEREOF, the Parties have caused this Agreement to be executed (where applicable,
by their respective officers or other authorized Persons thereunto duly authorized) as of the date first written above. 
  

			
	By:	 	 /s/ Jerry Coleman

	Name:	 	Jerry Coleman

  
 [Signature Page to
Company Holders Support Agreement] 

 IN WITNESS WHEREOF, the Parties have caused this Agreement to be executed (where applicable,
by their respective officers or other authorized Persons thereunto duly authorized) as of the date first written above. 
  

			
	By:	 	 /s/ Roberto Sella

	Name:	 	Roberto Sella

  
 [Signature Page to
Company Holders Support Agreement] 

 IN WITNESS WHEREOF, the Parties have caused this Agreement to be executed (where applicable,
by their respective officers or other authorized Persons thereunto duly authorized) as of the date first written above. 
  

			
	By:	 	 /s/ Darrin Shamo

	Name:	 	Darrin Shamo

  
 [Signature Page to
Company Holders Support Agreement]Exhibit 10.15.2

 

ONCONOVA THERAPEUTICS, INC.

 

AMENDMENT TO EMPLOYMENT AGREEMENT

 

THIS AMENDMENT TO EMPLOYMENT
AGREEMENT (this “Amendment”), is made as of March ---18, 2021 (the “Amendment Effective
Date”), by and between Onconova Therapeutics, Inc., a Delaware corporation (the “Company”),
and Steven Fruchtman, M.D. (the “Employee”). Capitalized terms used and not otherwise defined herein
shall have the meanings ascribed to such terms in the Agreement (as defined below).

 

RECITALS

 

		A.	The Company and Employee previously entered into an Amended and Restated Employment Agreement dated
June 19, 2018 (the “Agreement”).

 

		B.	Employee was promoted to Chief Executive Officer effective as of January 15, 2019 and the
parties hereto wish to amend the Agreement to revise the severance benefits in connection with certain qualifying terminations
of employment as set forth herein.

 

AMENDMENT

 

The parties hereto hereby amend the Agreement
as follows, effective as of the Amendment Effective Date.

 

		1.	Section 4(d) is hereby deleted in its entirety and replaced with “Reserved”.

		2.	Section 4(e). Section 4(e) of the Agreement is hereby deleted in its entirety
and replaced with the following:

 

“Termination
by the Company without Cause or by Employee for Good Reason. If Employee’s employment by the Company ceases due
to a termination by the Company without Cause or a resignation by Employee for Good Reason, the Company shall:

 

(i)       pay
to Employee the balance of his accrued, but unpaid Base Salary, unreimbursed expenses, and his unused, accrued vacation time through
the termination date;

 

(ii)         to
the extent then approved, accrued and unpaid, pay to Employee the annual Bonus (if any) with respect to the fiscal year ended immediately
prior to the cessation of Employee’s employment, which such Bonus shall be paid at the time such Bonus would have otherwise
been paid absent Employee’s cessation of employment;

 

(iii)         pay
to Employee,

 

A.            in
the event Employee’s employment by the Company ceases due to a termination by the Company without Cause or by Employee for
Good Reason other than during the Change in Control Protection Period (as defined below), monthly severance payments equal to one-twelfth
of the sum of (1) Employee’s then current Base Salary, and (2) an amount equal to the Target Bonus for the fiscal
year during which Employee’s employment by the Company ceases, as determined in good faith by the Compensation Committee,
which severance payments shall be paid for the duration of the Severance Period in accordance with the Company’s usual payroll
practices, commencing within sixty (60) days following the termination date, subject to the six (6) month delay set forth
in Section 17(b) below, and the first payment shall include any unpaid installments from the termination date until the
first payment date; or

 

    

     

    

 

B.            in
the event Employee’s employment by the Company ceases due to a termination by the Company without Cause or by Employee for
Good Reason during the Change in Control Protection Period, a severance payment amount equal to the sum of one and one-half times
(1) Employee’s then current Base Salary plus (2) an amount equal to the Target Bonus for the fiscal year during
which Employee’s employment by the Company ceases, as determined in good faith by the Compensation Committee, in a lump sum
payment within sixty (60) days following the termination date; subject to the six (6) month delay set forth in Section 17(b) below,
provided that such payment shall be made in installments as set forth in Section 4(e)(iii)(A) above if the Change in
Control is not a “change in control event” as defined under Section 409A of the Internal Revenue Code of 1986,
as amended (the “Code”);

 

(iv)         cause
any outstanding unvested options to purchase shares of Common Stock of the Company previously awarded to Employee to become fully
vested as of the date of his termination of employment pursuant to this Section 4(e);

 

(v)          if
Employee validly elects to receive continuation coverage under the Company’s group health plan pursuant to the Consolidated
Omnibus Budget Reconciliation Act of 1985 (“COBRA”), reimburse Employee for a portion of the applicable premium payable
for such COBRA continuation coverage for the duration of the Severance Period in an amount equal to the employer’s portion
of such premiums at the rate in effect on Employee’s termination date; provided, however, that if the Company determines
that it cannot continue to provide Employee with such benefit (either pursuant to the terms of the applicable group health plan,
as a result of applicable law, or otherwise), the Company shall make supplemental monthly severance payments to Employee in an
amount equal to the monthly amount the Company would have otherwise reimbursed to Employee for his participation in such group
health plan for the duration of the Severance Period.”

 

Except as otherwise provided in this Section 4,
all compensation and benefits will cease at the time of Employee’s cessation of employment and the Company will have no further
liability or obligation by reason of such cessation of employment. The payments and benefits set forth in Section 4(e)(iii),
(iv) and (v) shall only be paid if Employee signs and does not revoke a release and waiver of claims in a form approved
by the Company and such release becomes effective and irrevocable within 60 days of Employee’s cessation of employment and
Employee’s continued compliance with the restrictive covenants in Sections 5, 6 and 7 in this Agreement.

 

    

     

    

 

		3.	Section 4(g)(v). Section 4(g)(v) of the Agreement is hereby deleted in its
entirety and replaced with the following:

 

“Severance Period” shall mean
(i) the twelve (12)-month period immediately following the date Employee’s employment with the Company ceases due to
a termination by the Company without Cause or by Employee for Good Reason other than during the Change in Control Protection Period
or (ii) the eighteen (18)-month period immediately following the date Employee’s employment with the Company ceases
due to a termination by the Company without Cause or by Employee for Good Reason during the Change in Control Protection Period.”

 

		4.	Section 20. A new Section 20 is added to the Agreement, as follows:

 

“Whistleblower
Protections and Trade Secrets. Notwithstanding anything to the contrary contained herein, nothing in this Agreement
prohibits Employee from reporting possible violations of federal law or regulation to any United States governmental agency or
entity in accordance with the provisions of and rules promulgated under Section 21F of the Securities Exchange Act of
1934 or Section 806 of the Sarbanes-Oxley Act of 2002, or any other whistleblower protection provisions of state or federal
law or regulation (including the right to receive an award for information provided to any such government agencies). Furthermore,
in accordance with 18 U.S.C. § 1833, notwithstanding anything to the contrary in this Agreement: (i) Employee shall not
be in breach of this Agreement, and shall not be held criminally or civilly liable under any federal or state trade secret law
(x) for the disclosure of a trade secret that is made in confidence to a federal, state, or local government official or to
an attorney solely for the purpose of reporting or investigating a suspected violation of law, or (y) for the disclosure of
a trade secret that is made in a complaint or other document filed in a lawsuit or other proceeding, if such filing is made under
seal; and (ii) if Employee files a lawsuit for retaliation by the Company for reporting a suspected violation of law, Employee
may disclose the trade secret to Employee’s attorney, and may use the trade secret information in the court proceeding, if
Employee files any document containing the trade secret under seal, and does not disclose the trade secret, except pursuant to
court order.”

 

		5.	This Amendment shall be and, as of the Amendment Effective Date, is hereby incorporated in and
forms a part of, the Agreement.

 

		6.	Except as expressly provided herein, all terms and conditions of the Agreement shall remain in
full force and effect.

 

(Signature page follows)

 

    

     

    

 

IN
WITNESS WHEREOF, the parties hereto have executed this Amendment as of the date first written above.

 

	 	ONCONOVA THERAPEUTICS, INC.
	 	 	 
	 	By:	/s/ M. TERESA SHOEMAKER
	 	 	Name: M. Teresa Shoemaker
	 	 	Title: Compensation Committee Chair
	 	 	 
	 	 	EMPLOYEE
	 	 	 
	 	 	/s/ STEVEN M. FRUCHTMAN
	 	 	Steven M. Fruchtman

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