Document:

EX-10.2

 Exhibit 10.2 

FORM OF SUBSCRIPTION AGREEMENT 

This SUBSCRIPTION AGREEMENT (this “Subscription Agreement”) is entered into as of October 6, 2021 by and between
Supernova Partners Acquisition Company II, Ltd., a Cayman Islands exempted company (which shall domesticate as a Delaware corporation prior to the Closing) (the “Issuer”), and the undersigned (“Subscriber”). Defined
terms used but not otherwise defined herein shall have the respective meanings ascribed thereto in the Merger Agreement (as defined below). 

WHEREAS, the Issuer and Rigetti & Co., Inc., a Delaware corporation (“Rigetti”), are entering into that certain
Agreement and Plan of Merger, dated as of the date hereof (as amended, modified, supplemented or waived from time to time in accordance with its terms, the “Merger Agreement”), pursuant to which (i) prior to the Closing and
subject to the conditions of this Agreement, the Issuer shall domesticate as a Delaware corporation in accordance with Section 388 of the Delaware General Corporation Law (the “DGCL”) and the applicable provisions of the Cayman
Islands Companies Act (2021 Revision) (the “Companies Act”) (such deregistration and domestication, including all matters necessary or ancillary in order to effect such domestication, the “Domestication”) and
(ii) the Issuer will acquire 100% of the outstanding equity and equity equivalents of Rigetti (including options, warrants, preferred stock or other securities that have the right to acquire or convert into equity securities of Rigetti) (the
“Acquisition”); 
 WHEREAS, in connection with the Acquisition, Subscriber desires to subscribe for and purchase from the
Issuer the number of shares of common stock, par value $0.0001 per share, of the Issuer (after the Domestication) (the “Domesticated Issuer Common Stock”), set forth on Subscriber’s signature page hereto (the
“Shares”) for a purchase price of $10.00 per share (the “Per Share Price”) and an aggregate purchase price as set forth on Subscriber’s signature page hereto (the “Purchase Price”), and the
Issuer desires to issue and sell to Subscriber the Shares in consideration of the payment of the Purchase Price therefor by or on behalf of Subscriber to the Issuer, all on the terms and conditions set forth herein; and 

WHEREAS, certain other investors (each, an “Other Subscriber”) are entering into separate subscription agreements with the
Issuer (each, an “Other Subscription Agreement”), pursuant to which such investors have agreed or will agree to purchase Domesticated Issuer Common Stock at the Per Share Price (collectively with the Shares to be purchased
hereunder, the “PIPE Securities”) on the Closing Date (as defined below) for a total aggregate investment of $102,510,000; 

NOW, THEREFORE, in consideration of the foregoing and the mutual representations, warranties and covenants, and subject to the conditions,
herein contained, and intending to be legally bound hereby, the parties hereto hereby agree as follows: 
 For ease of administration, this
single Subscription Agreement is being executed so as to enable each Subscriber identified on the signature page to enter into a Subscription Agreement, severally, but not jointly. The parties agree that (i) the Subscription Agreement
shall be treated as if it were a separate agreement with respect to each Subscriber listed on the signature page, as if each Subscriber entity had executed a separate Subscription Agreement naming only itself as Subscriber, and (ii) no
Subscriber listed on the signature page shall have any liability under the Subscription Agreement for the obligations of any other Subscriber so listed. 
  

	1.	 Subscription. Subject to the terms and conditions hereof, at the Closing (as defined below), Subscriber
hereby agrees to subscribe for and purchase, and the Issuer hereby agrees to issue and sell to Subscriber, upon the payment of the Purchase Price, the Shares (such subscription and issuance, the “Subscription”).

	2.	 Representations, Warranties and Agreements. 

 

	 	2.1.	 Subscriber’s Representations, Warranties and Agreements. To induce the Issuer to issue the Shares
to Subscriber, Subscriber hereby represents and warrants to the Issuer and the Placement Agents (as defined below) and acknowledges and agrees with the Issuer and the Placement Agents as follows: 

 

	 	2.1.1.	 If Subscriber is not an individual, Subscriber has been duly formed or incorporated and is validly existing in
good standing under the laws of its jurisdiction of incorporation or formation, with power and authority to enter into, deliver and perform its obligations under this Subscription Agreement. If Subscriber is an individual, Subscriber has the
authority to enter into, deliver and perform its obligations under this Subscription Agreement. 

  

	 	2.1.2.	 If Subscriber is not an individual, this Subscription Agreement has been duly authorized, validly executed and
delivered by Subscriber. If Subscriber is an individual, the signature on this Subscription Agreement is genuine, and Subscriber has legal competence and capacity to execute the same. Assuming that this Subscription Agreement constitutes the valid
and binding agreement of the Issuer, this Subscription Agreement is the valid and binding obligation of Subscriber and is enforceable against Subscriber in accordance with its terms, except as may be limited or otherwise affected by
(i) bankruptcy, insolvency, fraudulent conveyance, reorganization, moratorium or other laws relating to or affecting the rights of creditors generally, and (ii) principles of equity, whether considered at law or equity.

  

	 	2.1.3.	 The execution, delivery and performance by Subscriber of this Subscription Agreement and the consummation of
the transactions contemplated herein do not and will not (i) conflict with or result in a breach or violation of any of the terms or provisions of, or constitute a default under, or result in the creation or imposition of any lien, charge or
encumbrance upon any of the property or assets of Subscriber or, if applicable, any of its subsidiaries pursuant to the terms of any indenture, mortgage, deed of trust, loan agreement, lease, license or other agreement or instrument to which
Subscriber or any of its subsidiaries is a party or by which Subscriber or any of its subsidiaries is bound or to which any of the property or assets of Subscriber or any of its subsidiaries is subject, which would reasonably be expected to have a
material adverse effect on the legal authority or ability of Subscriber to enter into or timely perform its obligations under this Subscription Agreement (a “Subscriber Material Adverse Effect”), (ii) if Subscriber is not an
individual, result in any breach or violation of the provisions of the organizational documents of Subscriber or any of its subsidiaries or (iii) result in any violation of any statute or any judgment, order, rule or regulation of any court or
Governmental Authority, domestic or foreign, having jurisdiction over Subscriber or, if applicable, any of its subsidiaries or any of their respective properties that would reasonably be expected to have a Subscriber Material Adverse Effect.

  

	 	2.1.4.	 Subscriber (i) is a “qualified institutional buyer” (as defined in Rule 144A under the
Securities Act of 1933, as amended (the “Securities Act”)) or an institutional “accredited investor” (within the meaning of Rule 501(a)(1), (2), (3), (7), (8), (9), (12) or (13) of Regulation D under the
Securities Act) satisfying the applicable requirements set forth on Schedule I hereto, (ii) is acquiring the Shares only for its own account and not for the account of others, or if Subscriber is subscribing for the Shares as a fiduciary
or agent for one or more investor accounts, each owner of such account is a qualified institutional buyer, and Subscriber has full investment discretion with respect to each such account, and the full power and authority to make the
acknowledgements, representations, warranties and agreements herein on behalf of each owner of each such account and (iii) is not acquiring the Shares with a view to, or for offer or sale in connection with, any distribution thereof in
violation of the Securities Act (and shall provide the requested information on Schedule I hereto). 

  
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	 	2.1.5.	 Subscriber understands that the Shares are being offered in a transaction not involving any public offering
within the meaning of the Securities Act and that the Shares have not been registered under the Securities Act. Subscriber understands that the Shares may not be resold, transferred, pledged or otherwise disposed of by Subscriber absent an effective
registration statement under the Securities Act, except (i) to the Issuer or a subsidiary thereof, (ii) to non-U.S. persons pursuant to offers and sales that occur solely outside the United States
within the meaning of Regulation S under the Securities Act or (iii) pursuant to another applicable exemption from the registration requirements of the Securities Act, and in each of cases (i) and (iii), in accordance with any applicable
securities laws of the states and other jurisdictions of the United States, and that any certificates representing the Shares shall contain a legend, or each register for the Shares in book entry form shall contain a notation, to such effect.
Subscriber acknowledges that the Shares will not be eligible for resale pursuant to Rule 144A promulgated under the Securities Act. Subscriber acknowledges and agrees that the Shares will not be eligible for offer, resale, transfer, pledge or
disposition pursuant to Rule 144 promulgated under the Securities Act until at least one year from the date that the Issuer files a Current Report on Form 8-K following the Closing Date that includes the
“Form 10” information required under applicable SEC rules and regulations. Subscriber understands and agrees that the Shares will be subject to the foregoing transfer restrictions and, as a result of these transfer restrictions, Subscriber
may not be able to readily resell the Shares and may be required to bear the financial risk of an investment in the Shares for an indefinite period of time. Subscriber understands that it has been advised to consult legal counsel prior to making any
offer, resale, pledge or transfer of any of the Shares. 

  

	 	2.1.6.	 Subscriber understands and agrees that Subscriber is purchasing the Shares directly from the Issuer. Subscriber
further acknowledges that there have not been, and Subscriber hereby agrees that it is not relying on, and has not relied upon, any statements, representations, warranties, covenants or agreements made to Subscriber by Deutsche Bank Securities Inc.
(“Deutsche Bank”) or Morgan Stanley & Co. LLC (“Morgan Stanley” and together with Deutsche Bank, the “Placement Agents”), the Issuer, Rigetti, or any of their respective affiliates or any control
persons, officers, directors, partners, agents or representatives, any other party to the Acquisition or any other person or entity, expressly or by implication, other than those representations, warranties, covenants and agreements of the Issuer
expressly set forth in this Subscription Agreement. Subscriber understands and acknowledges that (i) Deutsche Bank or its affiliate is also acting as a financial advisor to Rigetti in relation to the Acquisition and (ii) Morgan Stanley is
also acting as capital markets advisor to the Issuer. Subscriber understands and acknowledges (i) that Deutsche Bank’s role as financial advisor to Rigetti and (ii) Morgan Stanley’s role as capital markets advisor to the Issuer,
in each case, may give rise to potential conflicts of interest or the appearance thereof. 

  

	 	2.1.7.	 Subscriber’s acquisition and holding of the Shares will not constitute or result in a non-exempt prohibited transaction under Section 406 of the Employee Retirement Income Security Act of 1974, as amended (“ERISA”), Section 4975 of the Internal Revenue Code of 1986, as
amended (the “Code”), or any applicable similar law. 

  

	 	2.1.8.	 In making its decision to purchase the Shares, Subscriber has relied solely upon independent investigation made
by Subscriber and the Issuer’s representations, warranties and agreements herein. Without limiting the generality of the foregoing, Subscriber has not relied on any statements or other information provided by anyone other than the Issuer and
its representatives concerning the Issuer or 

  
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the Shares or the offer and sale of the Shares. Subscriber acknowledges and agrees that Subscriber has received access to, and has had an adequate opportunity to review, such information as
Subscriber deems necessary in order to make an investment decision with respect to the Shares, including with respect to the Issuer, Rigetti and the Acquisition, and made its own assessment and is satisfied concerning the relevant tax and other
economic considerations relevant to Subscriber’s investment in the Shares. Without limiting the generality of the foregoing, Subscriber acknowledges that, as the Subscriber deems necessary, it has reviewed (i) the Issuer’s filings
with the Securities and Exchange Commission (the “Commission”), (ii) a presentation with respect to Rigetti provided to Subscriber by the Issuer, (iii) summary key risks related to the Issuer, Rigetti and the Acquisition
provided to Subscriber by the Issuer and (iv) the financial statements of Rigetti as of January 31, 2020 and 2021 and the years then ended. Subscriber represents and agrees that Subscriber and Subscriber’s professional advisor(s), if
any, have had the full opportunity to ask such questions, receive such answers and obtain such information as Subscriber and such Subscriber’s professional advisor(s), if any, have deemed necessary to make an investment decision with respect to
the Shares. Subscriber acknowledges and agrees that (i) neither of the Placement Agents, nor any affiliate of the Placement Agents, has provided Subscriber with any information or advice with respect to the Shares nor is such information or
advice necessary or desired and (ii) neither of the Placement Agents nor any of their respective affiliates has prepared any disclosure or offering document in connection with the offer and sale of the Shares. Neither of the Placement Agents
nor any of their respective affiliates has made or makes any representation, express or implied, as to the Issuer, Rigetti, their credit quality, the quality or value of the Shares, the Acquisition or the other transactions contemplated hereby, or
the Subscriber’s purchase of the Shares. In connection with the issuance of the Shares to Subscriber and the purchase of the Shares by Subscriber, neither of the Placement Agents nor any of their respective affiliates has acted as a financial
advisor or fiduciary to Subscriber. Subscriber acknowledges that neither of the Placement Agents shall have any liability or any obligation to the Subscriber in respect of this Subscription Agreement or the transactions contemplated hereby
including, but not limited to, any action heretofore or hereafter taken or omitted to be taken by any of them in connection with the Subscriber’s purchase of the Shares. The Subscriber hereby understands and acknowledges that none of the
Placement Agents, nor any of their respective affiliates, nor any control persons, officers, directors, employees, agents or representatives of any of the foregoing has made any independent investigation with respect to the Issuer, Rigetti or its
subsidiaries or any of their respective businesses, or the Shares or the accuracy, completeness or adequacy of any information supplied to the Subscriber by the Issuer. 

 

	 	2.1.9.	 The Subscriber acknowledges that it has not relied on the Placement Agents in connection with its determination
as to the legality of its acquisition of the Shares or as to the other matters referred to herein and the Subscriber has not relied on any investigation that the Placement Agents, any of their respective affiliates or any person acting on their
behalf have conducted with respect to the Shares, Rigetti or the Issuer. The Subscriber further acknowledges that it has not relied on any information contained in any research reports prepared by the Placement Agents or any of their respective
affiliates. 

  

	 	2.1.10.	 Subscriber became aware of this offering of the Shares solely by means of direct contact between Subscriber and
the Issuer or Rigetti or a representative of the Issuer, including the Placement Agents. Subscriber has a pre-existing substantive relationship (as interpreted in guidance from the Commission under the
Securities Act) with the Issuer or its representatives, and the Shares were offered to Subscriber solely by direct contact between Subscriber and the Issuer or Rigetti or a representative of the Issuer. Subscriber did not become aware of this
offering of the Shares, nor were the Shares offered to Subscriber, by any other means. Subscriber acknowledges that the Issuer represents and warrants 

  
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that the Shares (i) were not offered by any form of general solicitation or general advertising, including methods described in Section 502(c) of Regulation D under the Securities
Act and (ii) are not being offered in a manner involving a public offering under, or in a distribution in violation of, the Securities Act, or any state securities laws. 

 

	 	2.1.11.	 Subscriber acknowledges that it is aware that there are substantial risks incident to the purchase and
ownership of the Shares. Subscriber has such knowledge and experience in financial and business matters as to be capable of evaluating the merits and risks of an investment in the Shares, and Subscriber has sought such accounting, legal and tax
advice as Subscriber has considered necessary to make an informed investment decision. Subscriber (i) is an institutional account as defined in FINRA Rule 4512(c), (ii) is a sophisticated investor, experienced in investing in private equity
transactions and capable of evaluating investment risks independently, both in general and with regard to all transactions and investment strategies involving a security or securities, and (iii) has exercised independent judgment in evaluating
its participation in the purchase of the Shares. Subscriber understands and acknowledges that the purchase and sale of the Shares hereunder meets (i) the exemptions from filing under FINRA Rule 5123(b)(1)(A) and (ii) the institutional
customer exemption under FINRA Rule 2111(b). 

  

	 	2.1.12.	 Alone, or together with any professional advisor(s), Subscriber has adequately analyzed and fully considered
the risks of an investment in the Shares and determined that the Shares are a suitable investment for Subscriber and that Subscriber is able at this time and in the foreseeable future to bear the economic risk of a total loss of Subscriber’s
investment in the Issuer. Subscriber acknowledges specifically that a possibility of total loss exists. 

  

	 	2.1.13.	 Subscriber understands and agrees that no federal or state agency has passed upon or endorsed the merits of the
offering of the Shares or made any findings or determination as to the fairness of an investment in the Shares. 

  

	 	2.1.14.	 Subscriber is not (i) a person or entity named on the List of Specially Designated Nationals and Blocked
Persons administered by the U.S. Treasury Department’s Office of Foreign Assets Control (“OFAC”) or in any Executive Order issued by the President of the United States and administered by OFAC (“OFAC List”), or
a person or entity prohibited by any OFAC sanctions program, (ii) a Designated National as defined in the Cuban Assets Control Regulations, 31 C.F.R. Part 515 or (iii) a non-U.S. shell bank or
providing banking services indirectly to a non-U.S. shell bank. Subscriber agrees to provide law enforcement agencies, if requested thereby, such records as required by applicable law; provided that
Subscriber is permitted to do so under applicable laws. If Subscriber is a financial institution subject to the Bank Secrecy Act (31 U.S.C. Section 5311 et seq.), as amended by the USA PATRIOT Act of 2001, and its implementing regulations
(collectively, the “BSA/PATRIOT Act”), Subscriber, directly or indirectly through a third-party administrator, maintains policies and procedures reasonably designed to comply with applicable obligations under the BSA/PATRIOT Act. To
the extent required, Subscriber, directly or indirectly through a third-party administrator, maintains policies and procedures reasonably designed for the screening of its investors against the OFAC sanctions programs, including the OFAC List.
Subscriber further represents and warrants that, to the extent required, it, directly or indirectly through a third-party administrator, maintains policies and procedures reasonably designed to ensure that the funds held by Subscriber and used to
purchase the Shares were legally derived. 

  
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	 	2.1.15.	 If Subscriber is an employee benefit plan that is subject to Title I of ERISA, a plan, an individual retirement
account or other arrangement that is subject to Section 4975 of the Code or an employee benefit plan that is a governmental plan (as defined in Section 3(32) of ERISA), a church plan (as defined in Section 3(33) of ERISA), a non-U.S. plan (as described in Section 4(b)(4) of ERISA) or other plan that is not subject to the foregoing but may be subject to provisions under any other federal, state, local,
non-U.S. or other laws or regulations that are similar to such provisions of ERISA or the Code, or an entity whose underlying assets are considered to include “plan assets” of any such plan, account
or arrangement (each, a “Plan”) subject to the fiduciary or prohibited transaction provisions of ERISA or Section 4975 of the Code, Subscriber represents and warrants that it has not relied on the Issuer or any of its
affiliates (the “Acquisition Parties”) for investment advice as the Plan’s fiduciary with respect to its decision to acquire and hold the Shares, and none of the Acquisition Parties shall at any time be relied upon as the
Plan’s fiduciary with respect to any decision to acquire, continue to hold or transfer the Shares. 

  

	 	2.1.16.	 [Reserved.] 

  

	 	2.1.17.	 No foreign person (as defined in 31 C.F.R. Part 800.224) in which the national or subnational governments of a
single foreign state have a substantial interest (as defined in 31 C.F.R. Part 800.244) will acquire a substantial interest in the Issuer as a result of the purchase and sale of Shares hereunder such that a declaration to the Committee on Foreign
Investment in the United States would be mandatory under 31 C.F.R. Part 800.401, and no foreign person will have control (as defined in 31 C.F.R. Part 800.208) over the Issuer from and after the Closing as a result of the purchase and sale of Shares
hereunder. 

  

	 	2.1.18.	 On the date the Purchase Price would be required to be funded to the Issuer pursuant to
Section 3.1, Subscriber will have sufficient, immediately available funds to pay the Purchase Price pursuant to Section 3.1. 

 

	 	2.1.19.	 Subscriber was not formed for the purpose of acquiring the Shares. 

 

	 	2.1.20.	 No broker, finder or other financial consultant has acted on behalf of Subscriber in connection with this
Subscription Agreement or the transactions contemplated hereby in such a way as to create any liability on the Issuer. 

  

	 	2.1.21.	 If Subscriber is an individual, then Subscriber resides in the state or province identified in the address of
Subscriber set forth on the signature page hereto. If Subscriber is not an individual, then the office or offices of Subscriber where its principal place of business is located is identified in the address or addresses of Subscriber set forth on the
signature page hereto. 

  

	 	2.1.22.	 [Reserved.] 

  

	 	2.1.23.	 If Subscriber is a resident or subject to the laws of Canada, Subscriber hereby declares, represents, warrants
and agrees as set forth in the attached Schedule II. 

  
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	 	2.2.	 Issuer’s Representations, Warranties and Agreements. To induce Subscriber to purchase the Shares,
the Issuer hereby represents and warrants to Subscriber and Placement Agents and agrees with Subscriber and Placement Agents as follows: 

  

	 	2.2.1.	 The Issuer is an exempted company duly incorporated, validly existing and in good standing under the laws of
the Cayman Islands (to the extent such concept exists in such jurisdiction), with corporate power and authority to own, lease and operate its properties and conduct its business as presently conducted and to enter into, deliver and perform its
obligations under this Subscription Agreement. As of the Closing Date, following the Domestication, Issuer will be duly incorporated, validly existing as a corporation and in good standing under the laws of the State of Delaware.

  

	 	2.2.2.	 The Shares have been duly authorized and, when issued and delivered to Subscriber against full payment for the
Shares in accordance with the terms of this Subscription Agreement and registered with the Issuer’s transfer agent, the Shares will be validly issued, fully paid and non-assessable, free and clear of all
liens or other restrictions (other than those arising under applicable securities laws) and will not have been issued in violation of or subject to any preemptive or similar rights created under the Issuer’s organizational documents, under the
Companies Act, the DGCL or pursuant to any agreement or other instrument to which the Issuer is a party or by which it is otherwise bound. 

  

	 	2.2.3.	 This Subscription Agreement has been duly authorized, validly executed and delivered by the Issuer and,
assuming that this Subscription Agreement constitutes the valid and binding obligation of Subscriber, is the valid and binding obligation of the Issuer and is enforceable against the Issuer in accordance with its terms, except as may be limited or
otherwise affected by (i) bankruptcy, insolvency, fraudulent conveyance, reorganization, moratorium or other laws relating to or affecting the rights of creditors generally and (ii) principles of equity, whether considered at law or
equity. 

  

	 	2.2.4.	 The execution, delivery and performance by the Issuer of this Subscription Agreement, issuance and sale of the
Shares and the consummation of the certain other transactions contemplated herein will not (i) conflict with or result in a breach or violation of any of the terms or provisions of, or constitute a default under, or result in the creation or
imposition of any lien, charge or encumbrance upon any of the property or assets of the Issuer or any of its subsidiaries pursuant to the terms of any indenture, mortgage, deed of trust, loan agreement, lease, license or other agreement or
instrument to which the Issuer or any of its subsidiaries is a party or by which the Issuer or any of its subsidiaries is bound or to which any of the property or assets of the Issuer or any of its subsidiaries is subject, which would reasonably be
expected to have a material adverse effect on the business, properties, financial condition, shareholders’ equity or results of operations of the Issuer or to have a material adverse effect on the legal authority or ability of the Issuer to
enter into or timely perform its obligations under this Subscription Agreement (an “Issuer Material Adverse Effect”), (ii) result in any breach or violation of the provisions of the organizational documents of the Issuer or any
of its subsidiaries or (iii) result in any violation of any statute or any judgment, order, rule or regulation of any court or Governmental Authority, domestic or foreign, having jurisdiction over the Issuer or any of its subsidiaries or
any of their respective properties that would reasonably be expected to have an Issuer Material Adverse Effect. 

  

	 	2.2.5.	 Neither the Issuer, nor any person acting on its behalf has, directly or indirectly, made any offers or sales
of any Issuer security or solicited any offers to buy any Issuer security under circumstances that would adversely affect reliance by the Issuer on Section 4(a)(2) of the Securities Act for the exemption from registration under the Securities
Act of the Shares to be issued as contemplated hereby. 

  
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	 	2.2.6.	 Neither the Issuer nor any person acting on its behalf has conducted any general solicitation or general
advertising, including methods described in Section 502(c) of Regulation D under the Securities Act, in connection with the offer or sale of any of the Shares and neither the Issuer nor any person acting on its behalf offered any of the Shares
in a manner involving a public offering under, or in a distribution in violation of, the Securities Act or any state securities laws. 

  

	 	2.2.7.	 Concurrently with the execution and delivery of this Subscription Agreement, the Issuer is entering into the
Other Subscription Agreements providing for the sale of certain PIPE Securities. Neither Issuer nor any of its affiliates has entered into any side letter agreements or other agreements or understandings (including written summaries of any oral
understandings) with any Other Subscriber or any other investor in connection with such Other Subscriber’s or investor’s direct or indirect equity investment in the Issuer, other than (a) Other Subscription Agreements, or (b) the
Merger Agreement (or as expressly contemplated by the Merger Agreement). The Other Subscription Agreements reflect the same Per Share Price and terms and conditions that are not more advantageous to any Other Subscriber thereunder than the terms and
condition hereunder (other than terms particular to the regulatory requirements of such Subscriber or its affiliates or related funds). The Other Subscription Agreements have not been amended in any material respect following the date of this
Subscription Agreement. 

  

	 	2.2.8.	 The authorized capital stock of the Issuer as of the date of this Subscription Agreement consists of
550,000,000 shares as follows: (a) 500,000,000 Class A Ordinary Shares, par value $0.0001 per share, (b) 50,000,000 Class B Ordinary Shares, par value $0.0001 per share (“Authorized Class B Shares”) and
(c) 5,000,000 Preference Shares, par value $0.0001 per share (“Authorized Preference Shares”). Following the Domestication, the authorized capital stock of the Issuer will consist of 10,000,000 shares of preferred stock, par
value $0.0001 per share and 1,000,000,000 shares of Domesticated Issuer Common Stock. As of the date hereof, and as of immediately prior to the completion of the Acquisition (prior to giving effect to (x) any redemption of any Class A
Ordinary Shares held by the Issuer’s public shareholders in connection with the consummation of the Acquisition and (y) the issuance of the PIPE Securities): (i) 34,500,000 Class A Ordinary Shares are and will be issued and
outstanding; (ii) 8,625,000 Authorized Class B Shares are and will be issued and outstanding; and (iii) no Authorized Preference Shares are or will be issued or outstanding; (iv) 4,450,000 warrants to purchase an aggregate of
4,450,000 Class A Ordinary Shares (the “Private Placement Warrants”) are and will be outstanding; and (v) 8,625,000 warrants to purchase an aggregate of 8,625,000 Class A Ordinary Shares (the “Public
Warrants,” and together with the Private Placement Warrants, the “Warrants”) are and will be outstanding. All (A) issued and outstanding Class A Ordinary Shares and Class B Ordinary Shares have been duly
authorized and validly issued, are fully paid and are non-assessable and (B) outstanding Warrants have been duly authorized and validly issued. Except as set forth above and pursuant to the Other
Subscription Agreements, the Merger Agreement and the other agreements and arrangements referred to therein, as of the date hereof, there are no outstanding options, warrants or other rights to subscribe for, purchase or acquire from Issuer any
Class A Ordinary Shares, Class B Ordinary Shares or other equity interests in Issuer or securities convertible into or exchangeable or exercisable for such equity interests. As of the date hereof, Issuer has no subsidiaries, other than
First Merger Sub and Second Merger Sub (each as defined in the Merger Agreement), and does not own, directly or indirectly, interests or investments (whether equity or debt) in any person, whether incorporated or unincorporated. There are no
stockholder agreements, voting trusts or other agreements or understandings to which Issuer is a party or by which it is bound relating to the voting of any securities of Issuer, other than (1) as set forth in the SEC Documents and (2) as
contemplated by the Merger Agreement. 

  
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	 	2.2.9.	 Assuming the accuracy of Subscriber’s representations and warranties set forth in
Section 2.1 of this Subscription Agreement, (x) no registration under the Securities Act is required for the offer and sale of the Shares by the Issuer to Subscriber contemplated by this Subscription Agreement and
(y) no consent, approval, order or authorization of, or registration, qualification, designation, declaration or filing with, any federal, state or local Governmental Authority is required on the part of the Issuer in connection with such offer
and sale of Shares contemplated by this Subscription Agreement. 

  

	 	2.2.10.	 The Issuer has made available to Subscriber (including via the Commission’s EDGAR system) a true, correct
and complete copy of each form, report, statement, schedule, prospectus, proxy, registration statement and other documents filed by the Issuer with the Commission of this Subscription Agreement (the “SEC Documents”), which SEC
Documents complied in all material respects with the requirements of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) applicable to the SEC Documents and the rules and regulations of the Commission promulgated
thereunder applicable to the SEC Documents at the time of filing, except as to the historical accounting treatment of the Warrants. Except as to the historical accounting treatment of Warrants in the Issuer’s
8-K dated March 10, 2021, each of the financial statements (including, in each case, any notes thereto) contained in the SEC Documents was prepared in accordance with U.S. generally accepted accounting
principles applied on a consistent basis throughout the periods indicated (except as may be indicated in the notes thereto or, in the case of unaudited statements, as permitted by Form 10-Q of the Commission)
and each fairly presents, in all material respects, the financial position, results of operations and cash flows of the Issuer as at the respective dates thereof and for the respective periods indicated therein. None of the SEC Documents filed under
the Exchange Act, contained, when filed or, if amended prior to the date of this Subscription Agreement, as of the date of such amendment with respect to those disclosures that are amended, any untrue statement of a material fact or omitted to state
a material fact required to be stated therein or necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading. Except for the Issuer’s Quarterly Report on Form 10-Q for the fiscal quarter ended March 31, 2021, the Issuer has timely filed each report, statement, schedule, prospectus, and registration statement that the Issuer was required to file with the Commission
since its inception. There are no material outstanding or unresolved comments in comment letters from the Commission staff with respect to any of the SEC Documents. 

 

	 	2.2.11.	 There are no pending or, to the knowledge of the Issuer, threatened, actions, which, if determined adversely,
would, individually or in the aggregate, reasonably be expected to have an Issuer Material Adverse Effect. There is no unsatisfied judgment or any open injunction binding upon the Issuer which would, individually or in the aggregate, reasonably be
expected to have an Issuer Material Adverse Effect. 

  

	 	2.2.12.	 Except for the Placement Agents, the Issuer has not paid, and is not obligated to pay, any brokerage, finder or
other commission or similar fee in connection with the issuance and sale of the Shares. 

  

	 	2.2.13.	 The Issuer is in compliance with all applicable laws, except where such
non-compliance would not, individually or in the aggregate, reasonably be expected to have an Issuer Material Adverse Effect. The Issuer has not received any written communication that alleges that the Issuer
is not in compliance with, or is in default or violation of, any applicable law, except where such non-compliance, default or violation would not, individually or in the aggregate, be reasonably expected to
have an Issuer Material Adverse Effect. 

  
 9 

	 	2.2.14.	 The issued and outstanding Issuer’s Class A Ordinary Shares are registered pursuant to
Section 12(b) of the Exchange Act and are listed for trading on the New York Stock Exchange (the “NYSE”) under the symbol “SNII.” The Issuer is in compliance in all material respects with the rules of the NYSE and
there is no action pending or, to the knowledge of the Issuer, threatened against the Issuer by the NYSE or the Commission with respect to any intention by such entity to deregister the Issuer’s Class A Ordinary Shares or terminate the
listing of the Issuer’s ordinary shares on the NYSE, except as disclosed in the SEC Documents relating to the late filing of the Issuer’s Quarterly Report on Form 10-Q for the fiscal quarter ended
March 31, 2021. None of the Issuer or its affiliates has taken any action in an attempt to terminate the registration of the Issuer’s Class A Ordinary Shares under the Exchange Act except as contemplated by the Merger Agreement. The
Issuer has not received any notice from the NYSE or the Commission regarding the revocation of such listing or otherwise regarding the delisting of the Issuer’s Class A Ordinary Shares from the NYSE or the Commission, except as disclosed
in the SEC Documents relating to the late filing of the Issuer’s Quarterly Report on Form 10-Q for the fiscal quarter ended March 31, 2021. 

 

	 	2.2.15.	 There are no securities or instruments issued by or to which the Issuer is a party containing anti-dilution or
similar provisions that will be triggered by the issuance of (i) the Shares or (ii) the shares of Domesticated Issuer Common Stock to be issued pursuant to any Other Subscription Agreement. 

 

	 	2.2.16.	 Neither the Issuer nor any of its subsidiaries is an “investment company” within the meaning of the
Investment Company Act of 1940, as amended. 

  

	 	2.2.17.	 Issuer acknowledges and agrees that, notwithstanding anything herein to the contrary, the Shares may be pledged
by Subscriber in connection with a bona fide margin agreement, which shall not be deemed to be a transfer, sale or assignment of the Shares hereunder, and Issuer effecting a pledge of Shares shall not be required to provide Issuer with any notice
thereof or otherwise make any delivery to Issuer pursuant to this Subscription Agreement. Issuer hereby agrees to execute and deliver such documentation as a pledgee of the Shares may reasonably request in connection with a pledge of the Shares to
such pledgee by Subscriber. 

  

	3.	 Settlement Date and Delivery. 

 

	 	3.1.	 Closing. The closing of the Subscription contemplated hereby (the “Closing”) shall
occur following the Domestication and immediately prior to, or substantially concurrently with, the consummation of the Acquisition (the “Closing Date”). Upon written notice from (or on behalf of) the Issuer to Subscriber (the
“Closing Notice”) at least five (5) Business Days prior to the date that the Issuer reasonably expects the closing of the Acquisition to occur (the “Expected Closing Date”), Subscriber shall deliver to the
Issuer no later than two (2) Business Days prior to the Closing, the Purchase Price, by wire transfer of United States dollars in immediately available funds to the account specified by the Issuer in the Closing Notice, such funds to be held by
the Issuer in escrow until the Closing. At the Closing, upon satisfaction (or, if applicable, waiver) of the conditions set forth in Sections 3.2 and 3.3, the Issuer shall deliver to Subscriber the Shares in book entry form in the name
of Subscriber (or its nominee in accordance with its delivery instructions) or to a custodian designated by Subscriber, as applicable. As promptly as practicable after the Closing, upon request of the Subscriber, the Issuer shall provide Subscriber
updated book-entry statements from the Issuer’s transfer agent reflecting the change in name of the Issuer to occur in connection with the Closing. If (i) the Subscription Agreement terminates following the delivery by Subscriber of the
Purchase Price but prior to the Closing having been consummated or the Acquisition is not consummated on or prior to the second (2nd) Business Day after the Expected Closing Date, the Issuer shall promptly (but no later than two

  
 10 

	 	
(2) Business Days thereafter) return the Purchase Price to Subscriber, without any deduction for or on account of any tax withholding, charges or set-off,
by wire transfer of United States dollars in immediately available funds to an account specified by Subscriber. Notwithstanding the immediately preceding sentence, (i) a failure to close on or within two (2) Business Days after the
Expected Closing Date shall not, by itself, be deemed to be a failure of any of the conditions to Closing set forth in Sections 3.2 and 3.3 to be satisfied or waived on or prior to the Closing Date, and
(ii) Subscriber shall remain obligated to consummate the Closing upon satisfaction of the conditions set forth in Sections 3.2 and 3.3. For purposes of this Subscription Agreement, “Business Day” means
a day other than a Saturday, Sunday or any other day on which commercial banks in New York, New York are authorized or required by Law to close. Each register and book entry for the Shares shall contain a notation with a legend substantially to the
effect described in Section 2.1.5 hereof. 

  

	 	3.2.	 Conditions to Closing of the Issuer. 

The Issuer’s obligations to sell and issue the Shares at the Closing are subject to the fulfillment or waiver by Issuer, on or prior to
the Closing Date, of each of the following conditions: 
  

	 	3.2.1.	 Representations and Warranties Correct. The representations and warranties made by Subscriber in
Section 2.1 hereof (i) shall be true and correct in all material respects when made (other than representations and warranties that are qualified as to materiality or Subscriber Material Adverse Effect, which
representations and warranties shall be true and correct in all respects), and (ii) shall be true and correct in all material respects on and as of the Closing Date, unless they specifically speak as of another date in which case they shall be
true and correct in all material respects as of such date (in each case, other than representations and warranties that are qualified as to materiality or Subscriber Material Adverse Effect, which representations and warranties shall be true in all
respects) with the same force and effect as if they had been made on and as of said date. 

  

	 	3.2.2.	 Compliance with Covenants. Subscriber shall have performed, satisfied and complied in all material
respects with the covenants, agreements and conditions required by this Subscription Agreement to be performed, satisfied or complied with by Subscriber at or prior to the Closing; provided that this condition shall be deemed satisfied unless
written notice of such non-compliance is provided by Issuer to the Subscriber prior to the Closing, and the Subscriber fails to cure such non-compliance in all material
respects within ten (10) Business Days of receipt of such notice. 

  

	 	3.2.3.	 Closing of the Acquisition. All conditions precedent to the Issuer’s obligations to consummate, or
cause to be consummated, the Acquisition set forth in the Merger Agreement shall have been satisfied (as determined by the parties to the Merger Agreement) or waived by the party entitled to the benefit thereof under the Merger Agreement (other than
those conditions that may only be satisfied at the consummation of the Acquisition, but subject to satisfaction (as determined by the parties to the Merger Agreement) or waiver by such party of such conditions as of the consummation of the
Acquisition), and such Acquisition is consummated substantially concurrently with the Closing. 

  

	 	3.2.4.	 Legality. There shall not be in force any order, judgment or injunction entered by or with any
Governmental Authority enjoining or prohibiting the issuance and sale of the Shares under this Subscription Agreement. 

  
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	 	3.2.5.	 Listing. Issuer’s initial listing application with NYSE in connection with the Acquisition
contemplated by this Agreement shall have been conditionally approved and, immediately following the Effective Time, Issuer shall satisfy any applicable initial and continuing listing requirements of NYSE, and Issuer shall not have received any
notice of non-compliance therewith that has not been cured prior to, or would not be cured at or immediately following, the Effective Time, and the Domesticated Issuer Common Stock shall have been approved for
listing on NYSE. 

  

	 	3.2.6.	 Domestication. The Domestication shall have been completed. 

 

	 	3.3.	 Conditions to Closing of Subscriber. 

Subscriber’s obligation to purchase the Shares at the Closing is subject to the fulfillment or waiver in writing by Subscriber, on or
prior to the Closing Date, of each of the following conditions: 
  

	 	3.3.1.	 Representations and Warranties Correct. The representations and warranties made by the Issuer in
Section 2.2 hereof (i) shall be true and correct in all material respects when made (other than representations and warranties that are qualified as to materiality or Issuer Material Adverse Effect, which
representations and warranties shall be true and correct in all respects), and (ii) shall be true and correct in all material respects on and as of the Closing Date, unless they specifically speak as of another date in which case they shall be
true and correct in all material respects as of such date (in each case, other than representations and warranties that are qualified as to materiality or Issuer Material Adverse Effect, which representations and warranties shall be true in all
respects) with the same force and effect as if they had been made on and as of said date, but in each case without giving effect to consummation of the Acquisition. 

 

	 	3.3.2.	 Compliance with Covenants. The Issuer shall have performed, satisfied and complied in all material
respects with the covenants, agreements and conditions required by this Subscription Agreement to be performed, satisfied or complied with by the Issuer at or prior to the Closing. 

 

	 	3.3.3.	 Closing of the Acquisition. (i) All conditions precedent to the consummation of the Acquisition set
forth in the Merger Agreement shall have been satisfied (as determined by the parties to the Merger Agreement) or waived by the party entitled to the benefit thereof under the Merger Agreement (other than those conditions that may only be satisfied
at the consummation of the Acquisition, but subject to satisfaction (as determined by the parties to the Merger Agreement) or waiver by such party of such conditions as of the consummation of the Acquisition) and (ii) the terms of the Merger
Agreement (as in effect on the date hereof) shall not have been amended, and no waiver thereunder shall have occurred, in a manner that would reasonably be expected to materially and adversely affect the economic benefits the Subscriber would
reasonably expect to receive under this Subscription Agreement without having received Subscriber’s prior written consent (it being understood Section 10.03(c) of the Merger Agreement shall be satisfied, without giving effect to any
amendment, modification or waiver thereto or to any related definition, from and after the date hereof, unless such waiver, modification or amendment has been consented to in advance in writing by Subscribers investing at least two-thirds of the aggregate Purchase Price under the Subscription Agreements). 

  

	 	3.3.4.	 No Material Adverse Event. There shall not have occurred, in the reasonable judgment of Subscribers
investing at least a majority of the aggregate Purchase Price under the Subscription Agreements, any Material Adverse Effect or Acquiror Material Adverse Effect (each as defined in the Merger Agreement). 

  
 12 

	 	3.3.5.	 Legality. There shall not be in force any order, judgment or injunction entered by or with any
Governmental Authority enjoining or prohibiting the issuance and sale of the Shares under this Subscription Agreement, and no Governmental Authority shall have instituted or threatened in writing a proceeding seeking to impose any such injunction or
prohibition. 

  

	 	3.3.6.	 Other Subscription Agreements. No Other Subscription Agreement shall have been amended, modified or
waived in any manner that materially benefits any Other Subscriber unless Subscriber shall have been offered substantially similar benefits in writing. 

  

	 	3.3.7.	 Listing. Issuer’s initial listing application with NYSE in connection with the Acquisition
contemplated by this Agreement shall have been conditionally approved and, immediately following the Effective Time, Issuer shall satisfy any applicable initial and continuing listing requirements of NYSE, and Issuer shall not have received any
notice of non-compliance therewith that has not been cured prior to, or would not be cured at or immediately following, the Effective Time, and the Shares shall have been approved for listing on NYSE.

  

	4.	 Registration Rights Agreement. 

 

	 	4.1.	 The Issuer agrees that it will use commercially reasonable efforts to file with the Commission (at the
Issuer’s sole cost and expense) a registration statement (the “Registration Statement”) registering the resale of the Shares, including additional shares issued pursuant to any stock split, stock dividend or similar transaction
(the “Registrable Securities”) within fifteen (15) business days after the Closing (the “Filing Deadline”), and the Issuer shall use its commercially reasonable efforts to have the Registration Statement
declared effective as soon as practicable after the consummation of the Acquisition, but no later than the earlier of (i) the 65th calendar day (or 90th calendar day if the Commission notifies the Issuer that it will “review” the Registration Statement) following the consummation of the Acquisition and (ii) the 10th Business Day after the date the Issuer is notified (orally or in writing, whichever is earlier) by the Commission that the Registration Statement will not be “reviewed” or will not be
subject to further review (such earlier date, the “Effectiveness Date”); provided, however, that if the Commission is closed for operations due to a government shutdown, the Effectiveness Date shall be extended by the
same amount of days that the Commission remains closed for operations; provided further, that the Issuer’s obligations to include the Registrable Securities in the Registration Statement are contingent upon Subscriber furnishing a
completed and executed selling shareholder questionnaire in customary form to the Issuer that contains the information required by Commission rules for a Registration Statement regarding Subscriber, the securities of the Issuer held by Subscriber
and the intended method of disposition of the Registrable Securities to effect the registration of the Registrable Securities, and Subscriber shall execute such documents in connection with such registration as the Issuer may reasonably request that
are customary of a selling shareholder in similar situations. For the avoidance of doubt, the Subscriber shall not in connection with the foregoing be required to execute any lock-up or similar agreement or
otherwise be subject to any contractual restriction on the ability to transfer the Registrable Securities. Subscriber agrees to disclose its beneficial ownership, as determined in accordance with Rule 13d-3 of
the Exchange Act, of Shares to the Issuer (or its successor) upon request to assist the Issuer in making the determination described above. The Issuer shall provide a draft of the Registration Statement to Subscriber for review at least two
(2) Business Days in advance of the date of filing the Registration Statement with the Commission (the “Filing Date”), and Subscriber shall provide any comments on the Registration Statement to the Issuer no later than the day
immediately preceding the Filing Date. In no event shall Subscriber be identified as a statutory underwriter in the Registration Statement unless requested by the Commission; provided that if the Commission requests that Subscriber be
identified as a statutory underwriter in the Registration Statement, Subscriber will have an 

  
 13 

	 	
opportunity to withdraw from the Registration Statement. Notwithstanding the foregoing it is expressly understood that the Issuer shall include the following in the Registration Statement,
“In offering the securities covered by this prospectus, the selling securityholders may be deemed to be “underwriters” within the meaning of the Securities Act in connection with such sales.” The Issuer may amend the Registration
Statement so as to convert the Registration Statement to a Registration Statement on Form S-3 at such time after the Issuer becomes eligible to use such Form S-3.
Notwithstanding the foregoing, if the Commission prevents the Issuer from including any or all of the shares proposed to be registered under the Registration Statement due to limitations on the use of Rule 415 under the Securities Act for the resale
of the shares of Domesticated Issuer Common Stock by the applicable shareholders or otherwise, such Registration Statement shall register for resale such number of shares of Domesticated Issuer Common Stock which is equal to the maximum number of
shares as is permitted to be registered by the Commission. In such event, the number of Registrable Securities to be registered for each selling shareholder named in the Registration Statement shall be reduced pro rata among all such selling
shareholders and as promptly as practicable after being permitted to register additional shares under Rule 415 under the Securities Act, the Issuer shall amend the Registration Statement or file a new Registration Statement to register such
additional shares and cause such amendment or Registration Statement to become effective as promptly as practicable. For purposes of clarification, any failure by the Issuer to file the Registration Statement by the Filing Deadline or to effect such
Registration Statement by the Effectiveness Date shall not otherwise relieve the Issuer of its obligations to file or effect the Registration Statement as set forth above in this Section 4. 

 

	 	4.2.	 In the case of the registration effected by the Issuer pursuant to this Subscription Agreement, the Issuer
shall, upon reasonable request, inform Subscriber as to the status of such registration. At its expense the Issuer shall: 

  

	 	4.2.1.	 except for such times as the Issuer is permitted hereunder to suspend the use of the prospectus forming part of
a Registration Statement, use its commercially reasonable efforts to keep such registration, and any qualification, exemption or compliance under state securities laws which the Issuer determines to obtain, continuously effective with respect to
Subscriber, and to keep the applicable Registration Statement or any subsequent shelf registration statement free of any material misstatements or omissions through the date the earliest of (i) three (3) years from the date the initial
Registration Statement covering the Registrable Securities is declared effective, (ii) the date on which Subscriber no longer owns any Shares or (iii) the first date on which Subscriber can sell all of its Shares (or shares received in
exchange therefor) without any condition or limitation under Rule 144; 

  

	 	4.2.2.	 advise Subscriber within five (5) Business Days (or such earlier date as otherwise indicated):

 (a) when a Registration Statement or any amendment thereto has been filed with the Commission and when a
Registration Statement or any post-effective amendment thereto has become effective, in each case within two (2) Business Days; 

(b) within two (2) Business Days after it shall have received notice or obtained knowledge thereof, of the issuance by the
Commission of any stop order suspending the effectiveness of any Registration Statement or the initiation of any proceedings for such purpose; 

(c) of the receipt by the Issuer of any notification with respect to the suspension of the qualification of the Registrable
Securities included therein for sale in any jurisdiction or the initiation or threatening of any proceeding for such purpose; and 

  
 14 

 (d) subject to the provisions in this Subscription Agreement, of the
occurrence of any event that requires the making of any changes in any Registration Statement or prospectus so that, as of such date, the statements therein do not include any untrue statements of a material fact and do not omit to state a material
fact required to be stated therein or necessary to make the statements therein (in the case of a prospectus, in the light of the circumstances under which they were made) not misleading. 

Notwithstanding anything to the contrary set forth in this Section 4.2.2, the Issuer shall not, when so advising
Subscriber of such events, provide Subscriber with any material, nonpublic information regarding the Issuer other than to the extent that providing notice to Subscriber of the occurrence of the events listed in (a) through (d) above may
constitute material, nonpublic information regarding the Issuer; 
  

	 	4.2.3.	 use its commercially reasonable efforts to obtain the withdrawal of any order suspending the effectiveness of
any Registration Statement as soon as reasonably practicable; 

  

	 	4.2.4.	 upon the occurrence of any event contemplated in Section 4.2.2(d), except for such
times as the Issuer is permitted hereunder to suspend, and has suspended, the use of a prospectus forming part of a Registration Statement, the Issuer shall use its commercially reasonable efforts to as soon as reasonably practicable prepare a
post-effective amendment to such Registration Statement or a supplement to the related prospectus, or file any other required document so that, as thereafter delivered to purchasers of the Registrable Securities included therein, such prospectus
will not include any untrue statement of a material fact or omit to state any material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading; and 

 

	 	4.2.5.	 use its commercially reasonable efforts to cause all Shares to be listed on each securities exchange or market,
if any, on which the Issuer’s Domesticated Issuer Common Stock is then listed. 

  

	 	4.3.	 Notwithstanding anything to the contrary in this Subscription Agreement, the Issuer shall be entitled to delay
or postpone the effectiveness of the Registration Statement, and from time to time to require Subscriber not to sell under the Registration Statement or to suspend the effectiveness thereof, if the filing, effectiveness or continued use of any
Registration Statement would require the Issuer to make any public disclosure of material non-public information, which disclosure, in the good faith determination of the board of directors of the Issuer,
after consultation with external counsel to the Issuer, (a) would be required to be made in any Registration Statement in order for the applicable Registration Statement not to contain any untrue statement of a material fact or omit to state a
material fact necessary to make the statements contained therein not misleading or to comply with applicable disclosure requirements, (b) would not be required to be made at such time if the Registration Statement were not being filed, and
(c) the Issuer has a bona fide business purpose for not making such information public (each such circumstance, a “Suspension Event”); provided, however, that the Issuer may not delay or suspend the
Registration Statement on more than two (2) occasions or for more than forty-five (45) consecutive calendar days, or more than ninety (90) total calendar days, in each case in any twelve (12)-month period. Upon receipt of any written
notice from the Issuer of the happening of any Suspension Event (which notice shall not contain material non-public information) during the period that the Registration Statement is effective or if as a result
of a Suspension Event the Registration Statement or related prospectus contains any untrue statement of a material fact or omits to state any material fact required to be stated therein or necessary to make the statements therein, in the light of
the circumstances under which they were made (in the case of the prospectus) not misleading, Subscriber agrees that (i) it will immediately discontinue offers and sales of the Shares under the Registration Statement until Subscriber receives
copies of a supplemental or amended prospectus (which the Issuer agrees to promptly prepare) that corrects the misstatement(s) or omission(s) referred to above and receives notice that any post-effective

  
 15 

	 	
amendment has become effective or unless otherwise notified by the Issuer that it may resume such offers and sales, and (ii) it will maintain the confidentiality of any information included
in such written notice delivered by the Issuer except (A) for disclosure to Subscriber’s employees, agents and professional advisers who need to know such information and are obligated to keep it confidential, (B) for disclosures to
the extent required in order to comply with reporting obligations to its limited partners who have agreed to keep such information confidential and (C) as required by law. If so directed by the Issuer, Subscriber will deliver to the Issuer or,
in Subscriber’s sole discretion destroy, all copies of the prospectus covering the Shares in Subscriber’s possession; provided, however, that this obligation to deliver or destroy all copies of the prospectus covering the
Shares shall not apply (i) to the extent Subscriber is required to retain a copy of such prospectus (a) in order to comply with applicable legal, regulatory, self-regulatory or professional requirements or (b) in accordance with a
bona fide pre-existing document retention policy or (ii) to copies stored electronically on archival servers as a result of automatic data back-up.

  

	 	4.4.	 Subscriber may deliver written notice (including via email in accordance with this Subscription Agreement) (an
“Opt-Out Notice”) to the Issuer requesting that Subscriber not receive notices from the Issuer otherwise required by this Section 4; provided, however,
that Subscriber may later revoke any such Opt-Out Notice in writing. Following receipt of an Opt-Out Notice from Subscriber (unless subsequently revoked), (i) the Issuer
shall not deliver any such notices to Subscriber and Subscriber shall no longer be entitled to the rights associated with any such notice and (ii) each time prior to Subscriber’s intended use of an effective Registration Statement,
Subscriber will notify the Issuer in writing at least three (3) Business Days in advance of such intended use, and if a notice of a Suspension Event was previously delivered (or would have been delivered but for the provisions of this
Section 4.4) and the related suspension period remains in effect, the Issuer will so notify Subscriber, within one (1) Business Day of Subscriber’s notification to the Issuer, by delivering to Subscriber a copy of
such previous notice of Suspension Event, and thereafter will provide Subscriber with the related notice of the conclusion of such Suspension Event immediately upon its availability. 

 

	 	4.5.	 The Issuer shall indemnify and hold harmless Subscriber (to the extent a seller under the Registration
Statement), the officers, directors, members, managers, partners, agents, investment advisors and employees of Subscriber, each person who controls Subscriber (within the meaning of Section 15 of the Securities Act or Section 20 of the
Exchange Act) and the officers, directors, members, managers, partners, agents and employees of each such controlling person, to the fullest extent permitted by applicable law, from and against any and all losses, claims, damages, liabilities, costs
(including, without limitation, reasonable attorneys’ fees) and expenses (collectively, “Losses”) that arise out of or are based upon any untrue or alleged untrue statement of a material fact contained in the Registration
Statement, any prospectus included in the Registration Statement or any form of prospectus or in any amendment or supplement thereto or in any preliminary prospectus, or arising out of or relating to any omission or alleged omission to state a
material fact required to be stated therein or necessary to make the statements therein (in the case of any prospectus or form of prospectus or supplement thereto, in the light of the circumstances under which they were made) not misleading, except
to the extent that untrue statements, alleged untrue statements, omissions or alleged omissions are based upon information regarding Subscriber furnished in writing to the Issuer by or on behalf of Subscriber expressly for use therein or Subscriber
has omitted a material fact from such information. The Issuer shall notify Subscriber promptly of the institution, threat or assertion of any proceeding arising from or in connection with the transactions contemplated by this Section 4 of which
the Issuer is aware. Such indemnity shall remain in full force and effect regardless of any investigation made by or on behalf of an indemnified party. Notwithstanding the forgoing, the Issuer’s indemnification obligations shall not apply to
amounts paid in settlement of any Losses or action if such settlement is effected without the prior written consent of the Issuer. 

  
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	 	4.6.	 Subscriber shall, severally and not jointly with any Other Subscriber in the offering contemplated by this
Subscription Agreement or selling shareholder named in the Registration Statement, indemnify and hold harmless the Issuer, its directors, officers, agents and employees, each person who controls the Issuer (within the meaning of Section 15 of
the Securities Act and Section 20 of the Exchange Act), and the directors, officers, agents or employees of such controlling persons, to the fullest extent permitted by applicable law, from and against all Losses arising out of or based upon
any untrue or alleged untrue statement of a material fact contained in any Registration Statement, any prospectus included in the Registration Statement, or any form of prospectus, or in any amendment or supplement thereto or in any preliminary
prospectus, or arising out of or relating to any omission or alleged omission of a material fact required to be stated therein or necessary to make the statements therein (in the case of any prospectus, or any form of prospectus or supplement
thereto, in the light of the circumstances under which they were made) not misleading to the extent, but only to the extent, that such untrue statements, alleged untrue statements, omissions or alleged omissions are based upon information regarding
Subscriber furnished in writing to the Issuer by or on behalf of Subscriber expressly for use therein. In no event shall the liability of Subscriber be greater in amount than the dollar amount of the net proceeds received by Subscriber upon the sale
of the Shares giving rise to such indemnification obligation. Notwithstanding the forgoing, Subscriber indemnification obligations shall not apply to amounts paid in settlement of any Losses or action if such settlement is effected without the prior
written consent of Subscriber. 

  

	 	4.7.	 Any person or entity entitled to indemnification herein shall (i) give prompt written notice to the
indemnifying party of any claim with respect to which it seeks indemnification (provided that the failure to give prompt notice shall not impair any person’s or entity’s right to indemnification hereunder to the extent such failure has not
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. 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), which settlement shall not include a statement or admission of fault and culpability on the part of such indemnified party, and which settlement shall 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. 

  

	 	4.8.	 The indemnification provided for under this Subscription 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 or entity of such indemnified party and shall survive the transfer of securities. 

 

	 	4.9.	 If the indemnification provided under Section 4.5 or Section 4.6 from the indemnifying party is
unavailable or insufficient to hold harmless an indemnified party in respect of any losses, claims, damages, liabilities and 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 expenses in such proportion as is appropriate to reflect the relative fault of the

  
 17 

	 	
indemnifying party and the indemnified party, as well as any other relevant equitable considerations; provided, however, that the liability of Subscriber hereunder (and including any amounts paid
pursuant to Section 4.6) shall be limited to the net proceeds received by such Subscriber from the sale of Shares giving rise to such indemnification obligation. 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 not made by, in the case of
an omission), or relates to information supplied by (or not supplied by, in the case of an omission), 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. 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 this
Section 4, any legal or other fees, charges or expenses reasonably incurred by such party in connection with any investigation or proceeding. 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 Section 4.9 from any person or entity who was not guilty of such fraudulent misrepresentation. 

 

	5.	 Termination. This Subscription Agreement shall terminate and be void and of no further force and effect,
and all rights and obligations of the parties hereunder shall terminate without any further liability on the part of any party in respect thereof, upon the earliest to occur of (i) such date and time as the Merger Agreement is terminated in
accordance with its terms, (ii) the mutual written agreement of the Issuer and Subscriber to terminate this Subscription Agreement, (iii) if any of the conditions to Closing set forth in Section 3 of this Subscription Agreement are
not satisfied or waived by the party entitled to grant such waiver on or prior to the Closing and, as a result thereof, the transactions contemplated by this Subscription Agreement are not consummated at the Closing or (iv) June 6, 2022,
if the Closing has not occurred on or before such date; provided that nothing herein will relieve any party from liability for any willful breach hereof prior to the time of termination, and each party will be entitled to any remedies at law
or in equity to recover reasonable and documented out-of-pocket losses, liabilities or damages arising from such willful breach. The Issuer shall promptly notify
Subscriber of the termination of the Merger Agreement promptly (and in any event within one (1) Business Day) after the termination of such agreement. 

  

	6.	 Miscellaneous. 

 

	 	6.1.	 Further Assurances. At the Closing, the parties hereto shall execute and deliver such additional
documents and take such additional reasonable actions as the parties reasonably may deem to be practical and necessary in order to consummate the Subscription as contemplated by this Subscription Agreement. 

6.1.1. Subscriber and the Issuer acknowledge that Subscriber, the Issuer and the Placement Agents (as third party
beneficiaries with respect to Section 2, Section 6 and Section 9 hereof) will rely on the acknowledgments, understandings, agreements, representations and warranties made
by Subscriber and Issuer contained in this Subscription Agreement. Prior to the Closing, each of Subscriber and the Issuer agrees to promptly notify the other party and the Placement Agents if any of its acknowledgments, understandings, agreements,
representations and warranties set forth herein are no longer accurate in all material respects. The Subscriber acknowledges and agrees that the purchase by the Subscriber of Shares hereunder will constitute a reaffirmation to the Issuer and the
Placement Agents of the acknowledgments, understandings, agreements, representations and warranties herein (as modified by any such notice) by the Subscriber as of the time of such purchase. The Subscriber further acknowledges and agrees, and the
Issuer acknowledges and agrees, that each Placement Agent is a third-party beneficiary of the representations and warranties of the Subscriber and the Issuer contained in this Subscription Agreement. 

  
 18 

 6.1.2. Each of the Issuer, the Subscriber and the Placement Agents (with
respect to Section 2, Section 6 and Section 9 hereof), is entitled to rely upon this Subscription Agreement and is irrevocably authorized to produce this Subscription Agreement or a copy hereof to any interested party in any
administrative or legal action or official inquiry with respect to the matters covered hereby. 
 6.1.3. Each of Subscriber
and the Issuer shall pay all of its own expenses in connection with this Subscription Agreement and the transactions contemplated herein. The Issuer shall be responsible for the fees of the Transfer Agent, the escrow agent, stamp taxes and all of
the fees of the Depository Trust Company (“DTC”) associated with the issuance of the Shares. 
 6.1.4. The
Issuer may request from Subscriber such additional information as the Issuer may deem necessary to evaluate the eligibility of Subscriber to acquire the Shares, and Subscriber shall promptly provide such information as may reasonably be requested,
to the extent readily available and to the extent consistent with its internal policies and procedures; provided that, to the extent Subscriber identifies any such additional information as confidential, the Issuer agrees to keep any such
information provided by Subscriber confidential (except to the extent required to be disclosed by applicable law, including in connection with any filings required to be made to the SEC or a stock exchange, in which case, Issuer shall provide prior
written notice to Subscriber of such disclosure). 
  

	 	6.2.	 Notices. Any notice or communication required or permitted hereunder shall be in writing and either
delivered personally, emailed or sent by overnight mail via a reputable overnight carrier, or sent by certified or registered mail, postage prepaid, and shall be deemed to be given and received (i) when so delivered personally, (ii) when
sent, with no mail undeliverable or other rejection notice, if sent by email, or (iii) three (3) Business Days after the date of mailing to the address below or to such other address or addresses as such person may hereafter designate by notice
given hereunder: 

 (i) if to Subscriber, to such address or addresses set forth on the signature
page hereto; and 
 (ii) if to the Issuer, to: 

Supernova Partners Acquisition Company II, Ltd. 

4301 50th Street NW 

Suite 300, PMB 1044 

Washington, DC 20016 

Attention: Robert Reid and Michael Clifton 

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

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

Latham & Watkins LLP 

555 Eleventh Street, NW, Suite 1000 

Washington, D.C. 20004 

Attention: Patrick Shannon and Nicholas Luongo 

Email: Patrick.Shannon@lw.com and Nick.Luongo@lw.com 

  
 19 

	 	6.3.	 Entire Agreement. This Subscription Agreement constitutes the entire agreement, and supersedes all other
prior agreements, understandings, representations and warranties, both written and oral, among the parties, with respect to the subject matter hereof, including any commitment letter entered into relating to the subject matter hereof.

  

	 	6.4.	 Modifications and Amendments. This Subscription Agreement may not be amended, modified, supplemented or
waived except by an instrument in writing, signed by the party against whom enforcement of such amendment, modification, supplement or waiver is sought; provided that any rights (but not obligations) of a party under this Subscription
Agreement may be waived, in whole or in part, by such party on its own behalf without the prior consent of any other party. Notwithstanding anything to the contrary herein, Section 2,
Section 6.1.1, Section 6.1.2, this Section 6.4 and Section 9 may not be modified, waived or terminated in a manner that is adverse to the
Placement Agents without the prior written consent of the Placement Agents. 

  

	 	6.5.	 Assignment. Neither this Subscription Agreement nor any rights, interests or obligations that may accrue
to the parties hereunder (including Subscriber’s rights to purchase the Shares) may be transferred or assigned without the prior written consent of the other party hereto (other than the Shares acquired hereunder, if any, and the
Subscriber’s rights under Section 4 hereof, and then only in accordance with this Subscription Agreement); provided that Subscriber’s rights and obligations hereunder may be assigned to any fund or account
managed by the same investment manager as Subscriber or an affiliate of Subscriber, without the prior consent of the Issuer, provided that such assignee(s) agrees in writing to be bound by the terms hereof, and upon such assignment by a
Subscriber(s), the assignee(s) shall become Subscriber(s) hereunder and have the rights and obligations and be deemed to make the representations and warranties of Subscriber provided for herein to the extent of such assignment; provided
further that, no assignment without the other party’s prior written consent shall relieve the assigning party of any of its obligations hereunder. 

 

	 	6.6.	 Benefit. Except as otherwise provided herein, this Subscription Agreement shall be binding upon, and
inure to the benefit of the parties hereto and their heirs, executors, administrators, successors, legal representatives, and permitted assigns, and the agreements, representations, warranties, covenants and acknowledgments contained herein shall be
deemed to be made by, and be binding upon, such heirs, executors, administrators, successors, legal representatives and permitted assigns. This Subscription Agreement shall not confer rights or remedies upon any person other than the parties hereto
and their respective successors and permitted assigns. 

  

	 	6.7.	 Governing Law. This Subscription Agreement, and any claim or cause of action hereunder based upon,
arising out of or related to this Subscription Agreement (whether based on law, in equity, in contract, in tort or any other theory) or the negotiation, execution, performance or enforcement of this Subscription Agreement, shall be governed by and
construed in accordance with the Laws of the State of New York, without giving effect to the principles of conflicts of law thereof. 

  

	 	6.8.	 Consent to Jurisdiction; Waiver of Jury Trial. Each of the parties irrevocably consents to the exclusive
jurisdiction and venue of any state court located in The City and County of New York (the “New York State Courts”), provided that if subject matter jurisdiction over the matter that is the subject of the action is vested
exclusively in the U.S. federal courts, such action shall be heard in the U.S. District Court for the Southern District of New York (together with the New York State Courts, the “Chosen Courts”), in connection with any matter based
upon or arising out of this Subscription Agreement. Each party hereby waives, and shall not assert as a defense in any legal dispute, that (i) such person is not personally subject to the jurisdiction of the Chosen Courts for any reason,
(ii) such action may not be brought or is not 

  
 20 

	 	
maintainable in the Chosen Courts, (iii) such person’s property is exempt or immune from execution, (iv) such action is brought in an inconvenient forum or (v) the venue of
such action is improper. Each party hereby consents to service of process in any such action in any manner permitted by New York law, further consents to service of process by nationally recognized overnight courier service guaranteeing overnight
delivery, or by registered or certified mail, return receipt requested, at its address specified pursuant to Section 6.2 and waives and covenants not to assert or plead any objection which they might otherwise have to such
manner of service of process. Notwithstanding the foregoing in this Section 6.8, a party may commence any action, claim, cause of action or suit in a court other than the Chosen Courts solely for the purpose of enforcing an
order or judgment issued by the Chosen Courts. TO THE EXTENT NOT PROHIBITED BY APPLICABLE LAW WHICH CANNOT BE WAIVED, EACH OF THE PARTIES WAIVES ANY RIGHT TO TRIAL BY JURY ON ANY CLAIMS OR COUNTERCLAIMS ASSERTED IN ANY LEGAL DISPUTE RELATING TO THIS
SUBSCRIPTION AGREEMENT WHETHER NOW EXISTING OR HEREAFTER ARISING. IF THE SUBJECT MATTER OF ANY SUCH LEGAL DISPUTE IS ONE IN WHICH THE WAIVER OF JURY TRIAL IS PROHIBITED, NO PARTY SHALL ASSERT IN SUCH LEGAL DISPUTE A NONCOMPULSORY COUNTERCLAIM
ARISING OUT OF OR RELATING TO THIS SUBSCRIPTION AGREEMENT. FURTHERMORE, NO PARTY SHALL SEEK TO CONSOLIDATE ANY SUCH LEGAL DISPUTE WITH A SEPARATE ACTION OR OTHER LEGAL PROCEEDING IN WHICH A JURY TRIAL CANNOT BE WAIVED. 

 

	 	6.9.	 Severability. If any provision of this Subscription Agreement shall be invalid, illegal or
unenforceable, the validity, legality or enforceability of the remaining provisions of this Subscription Agreement shall not in any way be affected or impaired thereby and shall continue in full force and effect. 

 

	 	6.10.	 No Waiver of Rights, Powers and Remedies. No failure or delay by a party hereto in exercising any right,
power or remedy under this Subscription Agreement, and no course of dealing between the parties hereto, shall operate as a waiver of any such right, power or remedy of such party. No single or partial exercise of any right, power or remedy under
this Subscription Agreement by a party hereto, nor any abandonment or discontinuance of steps to enforce any such right, power or remedy, shall preclude such party from any other or further exercise thereof or the exercise of any other right, power
or remedy hereunder. The election of any remedy by a party hereto shall not constitute a waiver of the right of such party to pursue other available remedies. No notice to or demand on a party not expressly required under this Subscription Agreement
shall entitle the party receiving such notice or demand to any other or further notice or demand in similar or other circumstances or constitute a waiver of the rights of the party giving such notice or demand to any other or further action in any
circumstances without such notice or demand. 

  

	 	6.11.	 Remedies. 

  

	 	6.11.1.	 The parties agree that irreparable damage would occur if this Subscription Agreement was not performed or the
Closing is not consummated in accordance with its specific terms or was otherwise breached and that money damages or other legal remedies would not be an adequate remedy for any such damage. It is accordingly agreed that the parties hereto shall be
entitled to equitable relief, including in the form of an injunction or injunctions, to prevent breaches or threatened breaches of this Subscription Agreement and to enforce specifically the terms and provisions of this Subscription Agreement in an
appropriate court of competent jurisdiction as set forth in Section 6.8, this being in addition to any other remedy to which any party is entitled at law or in equity, including money damages. The parties hereto
further agree (i) to waive any requirement for the security or posting of any bond in connection with any such equitable remedy, (ii) not to assert that a remedy of specific enforcement pursuant to this
Section 6.11 is unenforceable, invalid, contrary to applicable law or inequitable for any reason and (iii) to waive any defenses in any action for specific performance, including the defense that a remedy at law would
be adequate. 

  
 21 

	 	6.11.2.	 The parties acknowledge and agree that this Section 6.11 is an integral part of the
transactions contemplated hereby and without that right, the parties hereto would not have entered into this Subscription Agreement. 

  

	 	6.12.	 Survival of Representations and Warranties. All representations and warranties made by the parties
hereto in this Subscription Agreement shall survive the Closing until the expiration of any statute of limitations under applicable law. For the avoidance of doubt, if for any reason the Closing does not occur prior to the consummation of the
Acquisition, all representations, warranties, covenants and agreements of the parties hereunder shall survive the consummation of the Acquisition and remain in full force and effect until the expiration of any statute of limitations under applicable
law. 

  

	 	6.13.	 [Reserved.] 

  

	 	6.14.	 Headings and Captions. The headings and captions of the various subdivisions of this Subscription
Agreement are for convenience of reference only and shall in no way modify or affect the meaning or construction of any of the terms or provisions hereof. 

  

	 	6.15.	 Counterparts. This Subscription Agreement may be executed in one or more counterparts, all of which when
taken together shall be considered one and the same agreement and shall become effective when counterparts have been signed by each party and delivered to the other parties, it being understood that the parties need not sign the same counterpart. In
the event that any signature is delivered by facsimile transmission or any other form of electronic delivery, such signature shall create a valid and binding obligation of the party executing (or on whose behalf such signature is executed) with the
same force and effect as if such signature page were an original thereof. The words “execution,” “signed,” “signature,” “delivery,” and words of like import in or relating to this Subscription Agreement or any
document to be signed in connection with this Subscription Agreement shall be deemed to include electronic signatures, deliveries or the keeping of records in electronic form, each of which shall be of the same legal effect, validity or
enforceability as a manually executed signature, physical delivery thereof or the use of a paper-based recordkeeping system, as the case may be, and the parties hereto consent to conduct the transactions contemplated hereunder by electronic means.

  

	 	6.16.	 Construction. The words “include,” “includes,” and
“including” will be deemed to be followed by “without limitation.” Pronouns in masculine, feminine, and neuter genders will be construed to include any other gender, and words in the singular form will be construed
to include the plural and vice versa, unless the context otherwise requires. The words “this Subscription Agreement,” “herein,” “hereof,” “hereby,”
“hereunder,” and words of similar import refer to this Subscription Agreement as a whole and not to any particular subdivision unless expressly so limited. The parties hereto intend that each representation, warranty, and covenant
contained herein will have independent significance. If any party hereto has breached any representation, warranty, or covenant contained herein in any respect, the fact that there exists another representation, warranty or covenant relating to the
same subject matter (regardless of the relative levels of specificity) which such party hereto has not breached will not detract from or mitigate the fact that such party hereto is in breach of the first representation, warranty, or covenant. All
references in this Subscription Agreement to numbers of shares, per share amounts and purchase prices shall be appropriately adjusted to reflect any stock split, stock dividend, stock combination, recapitalization or the like occurring after the
date hereof. 

  
 22 

	 	6.17.	 Mutual Drafting. This Subscription Agreement is the joint product of the parties hereto and each
provision hereof has been subject to the mutual consultation, negotiation and agreement of the parties and shall not be construed for or against any party hereto by virtue of the authorship of any of the provisions of this Subscription Agreement.

  

	7.	 Cleansing Statement; Disclosure. 

 

	 	7.1.	 The Issuer shall, by 9:00 a.m., Eastern time, on the first (1st) Business Day immediately following the date of
this Subscription Agreement (the time of such filing, “Disclosure Time”), issue one or more press releases or file with the Commission a Current Report on Form 8-K disclosing, to the extent
not previously publicly disclosed, all material terms of the transactions contemplated hereby and by any Other Subscription Agreements executed and delivered at such time and the Acquisition. From and after the Disclosure Time, the Issuer represents
to the Subscriber that it shall have publicly disclosed all material, non-public information delivered to the Subscriber by the Issuer or Rigetti or any of its respective officers, directors, employees or
agents in connection with the transactions contemplated by the Subscription Agreement and the Merger Agreement, and the Subscriber shall no longer be subject to any confidentiality or similar obligations under any current agreement, whether written
or oral with Issuer, Placement Agents or any of their affiliates, relating to the transactions contemplated by this Subscription Agreement. 

  

	 	7.2.	 Subscriber hereby consents to the publication and disclosure in (x) the Current Report on Form 8-K filed by the Issuer with the Commission in connection with the execution and delivery of the Merger Agreement, the Proxy Statement or any other filing with the Commission pursuant to applicable
securities laws and (y) any other documents or communications provided by the Issuer to any Governmental Authority or to securityholders of the Issuer, in each case, (i) as and to the extent required by applicable law or the Commission or
any other Governmental Authority, and (ii) in the filing of this Subscription Agreement with the Commission and in the related Current Report on Form 8-K, of Subscriber’s name and identity and the
nature of Subscriber’s commitments, arrangements and understandings under and relating to this Subscription Agreement and, if deemed required or appropriate by the Issuer, a copy of this Subscription Agreement. Other than as set forth in the
immediately preceding sentence, without Subscriber’s prior written consent, the Issuer will not publicly disclose or use the name of Subscriber or of its affiliates or advisers (including, for the avoidance of doubt, in any press release or
marketing materials), other than to the Issuer’s lawyers, independent accountants and to other advisors and service providers who reasonably require such information in connection with the provision of services to such person, are advised of
the confidential nature of such information and are obligated to keep such information confidential. Subscriber will promptly provide any information reasonably requested by the Issuer for any regulatory application or filing made or approval
required in connection with the Acquisition (including filings with the Commission). 

  

	8.	 Trust Account Waiver. Notwithstanding anything to the contrary set forth herein, Subscriber acknowledges
that the Issuer has established a trust account containing the proceeds of its initial public offering and from certain private placements (collectively, with interest accrued from time to time thereon, the “Trust Account”).
Subscriber agrees that (i) it has no right, title, interest or claim of any kind in or to any monies held in the Trust Account, and (ii) it shall have no right of set-off or any right, title,
interest or claim of any kind (“Claim”) to, or to any monies in, the Trust Account, in each case, in connection with this Subscription Agreement, and hereby irrevocably waives any Claim to, or to any monies in, the Trust Account
that it may have in connection with this Subscription Agreement; provided, however, that nothing in this Section 8 (x) shall serve to limit or prohibit the Subscriber’s right to pursue a claim
against Issuer for legal relief against assets held outside the Trust Account, for specific performance or other equitable relief, (y) shall serve to limit or prohibit any claims that the Subscriber

  
 23 

	 	
may have in the future against Issuer’s assets or funds that are not held in the Trust Account (including any funds that have been released from the Trust Account and any assets that have
been purchased or acquired with any such funds) or (z) shall be deemed to limit Subscriber’s right, title, interest or claim to the Trust Account by virtue of such Subscriber’s record or beneficial ownership of securities of the
Issuer acquired by any means other than pursuant to this Subscription Agreement, including, but not limited to, any redemption right with respect to any such securities of the Issuer. In the event Subscriber has any Claim against the Issuer under
this Subscription Agreement, Subscriber shall pursue such Claim solely against the Issuer and its assets outside the Trust Account and not against the property or any monies in the Trust Account. Subscriber agrees and acknowledges that such waiver
is material to this Subscription Agreement and has been specifically relied upon by the Issuer to induce the Issuer to enter into this Subscription Agreement and Subscriber further intends and understands such waiver to be valid, binding and
enforceable under applicable law. In the event Subscriber, in connection with this Subscription Agreement, commences any action which seeks, in whole or in part, relief against the funds held in the Trust Account or distributions therefrom or any of
the Issuer’s shareholders, whether in the form of monetary damages or injunctive relief, Subscriber shall be obligated to pay to the Issuer all of its legal fees and costs in connection with any such action in the event that the Issuer prevails
in such action. 

  

	9.	 Non-Reliance. Subscriber acknowledges that it is not relying
upon, and has not relied upon, any statement, representation or warranty made by any person, firm or corporation (including, without limitation, the Placement Agents (or any of their respective affiliates or any control persons, officers, directors,
employees, partners, agents or representatives)), other than the representations and warranties of the Issuer expressly set forth in this Subscription Agreement, in making its investment or decision to invest in the Issuer. Subscriber agrees that
none of the Sponsor, Rigetti, the Placement Agents (and their respective affiliates or any control persons, officers, directors, employees, partners, agents or representatives) or any subscriber hereunder or Other Subscriber shall be liable to
Subscriber for any action heretofore or hereafter taken or omitted to be taken by any of them in connection with the purchase of the Shares hereunder. 

  

	10.	 Additional Covenants. 

 

	 	10.1.	 Rule 144. From and after such time as the benefits of Rule 144 promulgated under the Securities Act
or any other similar rule or regulation of the Commission that may allow Subscriber to sell securities of the Issuer to the public without registration may be available to holders of the Issuer’s common stock and until the earlier of
(x) the date on which Subscriber no longer owns any Shares and (y) the time Subscriber can sell the Shares under Rule 144 without any condition or limitation, the Issuer agrees to: 

 

	 	10.1.1.	 make and keep public information available, as those terms are understood and defined in Rule 144;

  

	 	10.1.2.	 file with the Commission in a timely manner all reports and other documents required of the Issuer under the
Securities Act and the Exchange Act so long as the Issuer remains subject to such requirements and the filing of such reports and other documents is required for the applicable provisions of Rule 144; and 

 

	 	10.1.3.	 furnish to Subscriber, promptly upon request, (x) a written statement by the Issuer, if true, that it has
complied with the reporting requirements of the Exchange Act as required under Rule 144, (y) a copy of the most recent annual or quarterly report of the Issuer and such other reports and documents so filed by the Issuer and (z) such other
information as may be reasonably requested to permit Subscriber to sell such securities pursuant to Rule 144 without registration. 

  

	 	10.2.	 Legend Removal. Subject to receipt from the Subscriber by the Issuer and the Issuer’s transfer
agent of customary representations and other documentation reasonably acceptable to the Issuer in connection therewith, the Subscriber may request that the Issuer remove any legend from the book entry position evidencing its Shares and the Issuer
will, if required by the Issuer’s transfer agent, use its commercially 

  
 24 

	 	
reasonable efforts cause an opinion of the Issuer’s counsel be provided, in a form reasonably acceptable to the Issuer’s transfer agent to the effect that the removal of such
restrictive legends in such circumstances may be effected under the Securities Act, following the earliest of such time as the Shares (1) are subject to or have been or are about to be sold or transferred pursuant to an effective registration
statement, (2) have been or are about to be sold pursuant to Rule 144, or (3) are eligible for resale under Rule 144(b)(1) or any successor provision without the requirement for the Issuer to be in compliance with the current public
information requirement under Rule 144 and without volume or manner-of-sale restrictions applicable to the sale or transfer of such Shares, or another exemption from
registration. If restrictive legends are no longer required for the Shares pursuant to the foregoing, the Issuer shall, in accordance with the provisions of this section and within three (3) trading days of any request therefor from the
Subscriber accompanied by such customary and reasonably acceptable representations and other documentation referred to above establishing that restrictive legends are no longer required, deliver to the Issuer’s transfer agent irrevocable
instructions to make a new, unlegended entry in book-entry form or by electronic delivery through DTC for such Shares. The Issuer shall be responsible for the fees of its transfer agent, its legal counsel and all DTC fees associated with such
issuance. 

  

	11.	 Tax Matters. Subscriber agrees to complete and return with this Subscription Agreement, upon request of
the Issuer (and no later than two (2) Business Days prior to Closing), and to update as necessary, a valid and properly executed Internal Revenue Service (“IRS”) Form W-9 or W-8, as applicable. Subscriber further agrees that, in the event that (i) the information contained on such IRS Form W-9 or W-8 is
no longer true and correct or (ii) upon reasonable request of the Issuer, Subscriber will provide a new IRS Form W-9 or W-8 to the Issuer. 

 

	12.	 Separate Obligations. The obligations of the Subscriber under this Subscription Agreement are several
and not joint with the obligations of any Other Subscriber under the Other Subscription Agreements, and the Subscriber shall not be responsible in any way for the performance of the obligations of any Other Subscriber. The decision of the Subscriber
to purchase the Shares has been made by the Subscriber independently of any Other Subscriber and independently of any information, materials, statements, opinions as to the business, affairs, operations, assets, properties, liabilities, results of
operations, condition (financial or otherwise) or prospects of the Issuer, Rigetti or any of their respective subsidiaries which may have been made or given by any Other Subscriber or by any agent or employee of any Other Subscriber, and neither the
Subscriber nor any of its agents or employees shall have any liability to any Other Subscriber (or to any other person) relating to or arising from any such information, materials, statements or opinions. The Subscriber acknowledges that no Other
Subscriber has acted as agent for the Subscriber in connection with making its investment hereunder and no Other Subscriber will be acting as agent of the Subscriber in connection with monitoring its investment in the Shares or enforcing its rights
under this Subscription Agreement. 

 [Signature Page Follows] 

  
 25 

 IN WITNESS WHEREOF, each of the Issuer and Subscriber has executed or caused this
Subscription Agreement to be executed by its duly authorized representative as of the date first written above. 
  

			
	 ISSUER:

	
	SUPERNOVA PARTNERS ACQUISITION COMPANY II, LTD.
		
	By:	 	 
	Name:	 	Michael S. Clifton
	Title:	 	Chief Financial Officer

  
 [Signature Page –
Subscription Agreement] 

 Accepted and agreed: 

SUBSCRIBER: 
  

									
	Signature of Subscriber:	 		 	Signature of Joint Subscriber, if applicable:
					
	By:	 	 	 		 	By:	 	 
	Name:	 		 		 	Name:	 	
	 Title:
	 		 		 	 Title:
	 	

  

					
		 		 	
			
	   
	 		 	   

		 		 	
	Name of Subscriber:	 		 	Name of Joint Subscriber, if applicable:
			
	   
	 		 	   

	(Please print. Please indicate name and capacity of 
person signing above)	 		 	(Please Print. Please indicate name and capacity of person 
signing above)
			
	   
	 		 	  

	Name in which securities are to be registered (if different from the name of Subscriber listed directly above):	 		 	
			
	Email Address:	 		 	
			
	If there are joint investors, please check one:	 		 	
			
	☐ Joint Tenants with Rights of Survivorship	 		 	
			
	☐ Tenants-in-Common	 		 	
			
	☐ Community Property	 		 	

  

									
				
	Subscriber’s EIN:	 	 	 		 	Joint Subscriber’s EIN:
		 		 		 	 
			
	Business Address-Street:	 		 	Mailing Address-Street (if different):
	 
	
	 
	City, State, Zip:	 		 	City, State, Zip:
				
	Attn:	 		 	Attn:	 	
				
	 Telephone
 No.:
	 	 	 	Telephone No.:	 	 
				
	Facsimile No.:	 	 	 	Facsimile No.:	 	 

  
 [Signature Page –
Subscription Agreement] 

	
	 Aggregate Number of Shares subscribed for:

	
	   

 Aggregate Purchase Price: $ ._______________ 

You must pay the Purchase Price by wire transfer of U.S. dollars in immediately available funds, to be held in escrow until the Closing if required, to the
account specified by the Issuer in the Closing Notice. 

  
 [Signature Page –
Subscription Agreement] 

 Schedule I 

ELIGIBILITY REPRESENTATIONS OF THE SUBSCRIBER 

FOR ENTITIES: 
  

	1.	 QUALIFIED INSTITUTIONAL BUYER STATUS 

(Please check the applicable subparagraphs): 
  

	 	☐	 We are a “qualified institutional buyer” (as defined in Rule 144A under the Securities Act of 1933,
as amended (the “Securities Act”)). 

 ** OR ** 
  

	2.	 INSTITUTIONAL ACCREDITED INVESTOR STATUS 

(Please check the applicable subparagraphs): 
  

	 	☐	 We are an “accredited investor” (within the meaning of Rule 501(a) under the Securities Act) for one
or more of the following reasons (Please check the applicable subparagraphs): 

  

	 	☐	 We are a bank, as defined in Section 3(a)(2) of the Securities Act or any savings and loan association or
other institution as defined in Section 3(a)(5)(A) of the Securities Act, whether acting in an individual or a fiduciary capacity. 

  

	 	☐	 We are a broker or dealer registered under Section 15 of the Securities Exchange Act of 1934, as amended.

  

	 	☐	 We are an insurance company, as defined in Section 2(13) of the Securities Act. 

 

	 	☐	 We are an investment company registered under the Investment Company Act of 1940 or a business development
company, as defined in Section 2(a)(48) of that act. 

  

	 	☐	 We are a Small Business Investment Company licensed by the U.S. Small Business Administration under
Section 301(c) or (d) of the Small Business Investment Act of 1958. 

  

	 	☐	 We are a plan established and maintained by a state, its political subdivisions or any agency or
instrumentality of a state or its political subdivisions for the benefit of its employees, if the plan has total assets in excess of $5 million. 

  

	 	☐	 We are an employee benefit plan within the meaning of Title I of the Employee Retirement Income Security Act of
1974, if the investment decision is being made by a plan fiduciary, as defined in Section 3(21) of such act, and the plan fiduciary is either a bank, a savings and loan association, an insurance company, or a registered investment adviser, or
if the employee benefit plan has total assets in excess of $5 million. 

  

	 	☐	 We are a private business development company, as defined in Section 202(a)(22) of the Investment Advisers
Act of 1940. 

	 	☐	 We are a corporation, Massachusetts or similar business trust, or partnership, or an organization described in
Section 501(c) (3) of the Internal Revenue Code of 1986, as amended, that was not formed for the specific purpose of acquiring the Shares, and that has total assets in excess of $5 million. 

 

	 	☐	 We are a trust with total assets in excess of $5 million not formed for the specific purpose of acquiring
the Shares, whose purchase is directed by a sophisticated person as described in Rule 506(b)(2)(ii) under the Securities Act. 

  

	 	☐	 We are an entity in which all of the equity owners are accredited investors. 

 

	 	☐	 We are an entity, of a type not listed above, not formed for the specific purpose of acquiring the securities
offered, owning investments in excess of $5 million. 

 * * AND * * 

 

	3.	 AFFILIATE STATUS 

(Please check the applicable box) 

THE SUBSCRIBER: 
  

	 	☐	 is: 

  

	 	☐	 is not: 

an “affiliate” (as defined in Rule 144 under the Securities Act) of the Issuer or acting on behalf of an affiliate of the Issuer.

 This page should be completed by the Subscriber and constitutes a part of the Subscription Agreement. 

  
 I-2 

 Schedule II 

ELIGIBILITY REPRESENTATIONS OF THE INVESTOR (Canadian Investors Only) 

 

	1.	 We hereby declare, represent and warrant that: 

 

	 	(a)	 we are purchasing the Shares as principal for our own account, or are deemed to be purchasing the Shares as
principal for our own account in accordance with applicable Canadian securities laws, and not as agent for the benefit of another investor; 

  

	 	(b)	 we are residents in or subject to the laws of one of the provinces or territories of Canada;

  

	 	(c)	 we are entitled under applicable securities laws to purchase the Shares without the benefit of a prospectus
qualified under such securities laws and, without limiting the generality of the foregoing, are both: 

  

	 	a.	 an “accredited investor” as defined in section 1.1 of National Instrument 45-106 Prospectus Exemptions (“NI 45-106”) or section 73.3(2) of the Securities Act (Ontario) by virtue of satisfying the indicated criterion in
Section 11 below, and we are not a person created or used solely to purchase or hold securities as an “accredited investor” as described in paragraph (m) of the definition of “accredited investor” in section 1.1 of NI 45-106; and 

  

	 	b.	 a “permitted client” as defined in section 1.1 of National Instrument
31-103 Registration Requirements, Exemptions and Ongoing Registrant Obligations (“NI 31-103”) by virtue of satisfying the indicated criterion in
Section 12 below; 

  

	 	(d)	 we have received, reviewed and understood, this Subscription Agreement and certain disclosure materials
relating to the placing of Shares in Canada and, are basing our investment decision solely on this Subscription and the materials provided by the Issuer and not on any other information concerning the Issuer or the offering of the Shares;

  

	 	(e)	 the acquisition of Shares does not and will not contravene any applicable Canadian securities laws, rules or
policies of the jurisdiction in which we are resident and does not trigger (i) any obligation to prepare and file a prospectus or similar document or (ii) any registration or other similar obligation on the part of any person;

  

	 	(f)	 we will execute and deliver within the applicable time periods all documentation as may be required by
applicable Canadian securities laws to permit the purchase of the Shares on the terms set forth herein and, if required by applicable Canadian securities laws, will execute, deliver and file or assist the Issuer in obtaining and filing such reports,
undertakings and other documents relating to the purchase of the Shares as may be required by any applicable Canadian securities laws, securities regulator, stock exchange or other regulatory authority; and 

 

	 	(g)	 neither we nor any party on whose behalf we are acting has been established, formed or incorporated solely to
acquire or permit the purchase of Shares without a prospectus in reliance on an exemption from the prospectus requirements of applicable Canadian securities laws. 

 

	2.	 We are aware of the characteristics of the Shares, the risks relating to an investment therein and agree that
we must bear the economic risk of its investment in the Shares. We understand that we will not be able to resell the Shares under applicable Canadian securities laws except in accordance with limited exemptions and compliance with other requirements
of applicable law, and we (and not the Issuer) are responsible for compliance with applicable resale restrictions or hold periods and will comply with all relevant Canadian securities laws in connection with any resale of the Shares.

	3.	 We hereby undertake to notify the Issuer immediately of any change to any declaration, representation, warranty
or other information relating to us set forth herein which takes place prior to the closing of the purchase of the Shares applied for hereby. 

  

	4.	 We understand and acknowledge that (i) the Issuer is not a reporting issuer in any province or territory
in Canada and its securities are not listed on any stock exchange in Canada and there is currently no public market for the Shares in Canada; and (ii) the Issuer currently has no intention of becoming a reporting issuer in Canada and the Issuer
is not obligated to file and has no present intention of filing a prospectus with any securities regulatory authority in Canada to qualify the resale of the Shares to the public, or listing the Issuer’s securities on any stock exchange in
Canada and thus the applicable restricted period or hold period may not commence and the Shares may be subject to an unlimited hold period or restricted period in Canada and in that case may only be sold pursuant to limited exemptions under
applicable securities legislation. 

  

	5.	 We confirm we have reviewed applicable resale restrictions under relevant Canadian legislation and regulations.

  

	6.	 It is acknowledged that we should consult our own legal and tax advisors with respect to the tax consequences
of an investment in the Shares in our particular circumstances and with respect to the eligibility of the Shares for investment by us and resale restrictions under relevant Canadian legislation and regulations, and that we have not relied on the
Issuer or on the contents of the disclosure materials provided by the Issuer, for any legal, tax or financial advice. 

  

	7.	 If we are a resident of Quebec, we acknowledge that it is our express wish that all documents evidencing or
relating in any way to the sale of the Shares be drawn in the English language only. Si nous sommes résidents de la province de Québec, nous reconnaissons par les présentes que c’est notre volonté expresse que
tous les documents faisant foi ou se rapportant de quelque manière à la vente des engagements soient rédigés en anglais seulement. 

 

	8.	 We understand and acknowledge that we are making the representations, warranties and agreements contained
herein with the intent that they may be relied upon by the Issuer and the agents in determining our eligibility to purchase the Shares, including the availability of exemptions from the prospectus requirements of applicable Canadian securities laws
in connection with the issuance of the Shares. 

  

	9.	 We consent to the collection, use and disclosure of certain personal information for the purposes of meeting
legal, regulatory, self-regulatory, security and audit requirements (including any applicable tax, securities, money laundering or anti-terrorism legislation, rules or regulations) and as otherwise permitted or required by law, which disclosures may
include disclosures to tax, securities or other regulatory or self-regulatory authorities in Canada and/or in foreign jurisdictions, if applicable, in connection with the regulatory oversight mandate of such authorities. 

 

	10.	 If we are an individual resident in Canada, we acknowledge that: (A) the Issuer or the agents may be
required to provide personal information pertaining to us as required to be disclosed in Schedule I of Form 45-106F1 Report of Exempt Distribution (“Form
45-106F1”) under NI 45-106 (including its name, email address, address, telephone number and the aggregate purchase price paid by the purchaser) (“personal
information”) to the securities regulatory authority or regulator in the local jurisdiction (the “Regulator”); (B) the personal information is being collected indirectly by the Regulator under the authority granted to it in securities
legislation; and (C) the personal information is being collected for the purposes of the administration and enforcement of the securities legislation; and by purchasing the securities, we shall be deemed to have authorized such indirect
collection of personal information by the Regulator. Questions about the indirect collection of information should be directed to the Regulator in the local jurisdiction, using the contact information set out below: 

 

	 	(a)	 in Alberta, the Alberta Securities Commission, Suite 600, 250—5th Street SW, Calgary, Alberta T2P 0R4,
Telephone: (403) 297-6454, toll free in Canada: 1-877-355-0585; 

  
 II-2 

	 	(b)	 in British Columbia, the British Columbia Securities Commission, P.O. Box 10142, Pacific Centre, 701 West
Georgia Street, Vancouver, British Columbia V7Y 1L2, Inquiries: (604) 899-6581, toll free in Canada:
1-800-373-6393, Email: inquiries@bcsc.bc.ca; 

 

	 	(c)	 in Manitoba, The Manitoba Securities Commission, 500—400 St. Mary Avenue, Winnipeg, Manitoba R3C 4K5,
Telephone: (204) 945-2548, toll free in Manitoba 1-800-655-5244; 

 

	 	(d)	 in New Brunswick, Financial and Consumer Services Commission (New Brunswick), 85 Charlotte Street, Suite 300,
Saint John, New Brunswick E2L 2J2, Telephone: (506) 658-3060, toll free in Canada:
1-866-933-2222, Email: info@fcnb.ca; 

  

	 	(e)	 in Newfoundland and Labrador, Government of Newfoundland and Labrador, Financial Services Regulation Division,
P.O. Box 8700, Confederation Building, 2nd Floor, West Block, Prince Philip Drive, St. John’s, Newfoundland and Labrador, A1B 4J6, Attention: Director of Securities, Telephone: (709) 729-4189,

  

	 	(f)	 in the Northwest Territories, the Government of the Northwest Territories, Office of the Superintendent of
Securities, P.O. Box 1320, Yellowknife, Northwest Territories X1A 2L9, Attention: Deputy Superintendent, Legal & Enforcement, Telephone: (867) 920-8984; 

 

	 	(g)	 in Nova Scotia, the Nova Scotia Securities Commission, Suite 400, 5251 Duke Street, Duke Tower, P.O. Box 458,
Halifax, Nova Scotia B3J 2P8, Telephone: (902) 424-7768; 

  

	 	(h)	 in Nunavut, Government of Nunavut, Department of Justice, Legal Registries Division, P.O. Box 1000, Station
570, 1st Floor, Brown Building, Iqaluit, Nunavut X0A 0H0, Telephone: (867) 975-6590; 

  

	 	(i)	 in Ontario, the Inquiries Officer at the Ontario Securities Commission, 20 Queen Street West, 22nd Floor,
Toronto, Ontario M5H 3S8, Telephone: (416) 593-8314, toll free in Canada: 1-877-785-1555,
Email: exemptmarketfilings@osc.gov.on.ca; 

  

	 	(j)	 in Prince Edward Island, the Prince Edward Island Securities Office, 95 Rochford Street, 4th Floor Shaw
Building, P.O. Box 2000, Charlottetown, Prince Edward Island C1A 7N8, Telephone: (902) 368-4569; 

  

	 	(k)	 in Québec, the Autorité des marchés financiers, 800, Square Victoria, 22e étage,
C.P. 246, Tour de la Bourse, Montréal, Québec H4Z 1G3, Telephone: (514) 395-0337 or
1-877-525-0337, Email: financementdessocietes@lautorite.qc.ca (For corporate finance issuers),
fonds_dinvestissement@lautorite.qc.ca (For investment fund issuers); 

  

	 	(l)	 in Saskatchewan, the Financial and Consumer Affairs Authority of Saskatchewan, Suite 601—1919 Saskatchewan
Drive, Regina, Saskatchewan S4P 4H2, Telephone: (306) 787-5879; and 

  

	 	(m)	 in Yukon, Government of Yukon, Department of Community Services, Law Centre, 3rd Floor, 2130 Second Avenue,
Whitehorse, Yukon Y1A 5H6, Telephone: (867) 667-5314. 

  
 II-3 

	11.	 We hereby represent, warrant, covenant and certify that we are, or any party on whose behalf we are acting is,
an “accredited investor” as defined in NI 45-106 or section 73.3(1) of the Securities Act (Ontario) by virtue of satisfying the indicated
criterion below: 

 Please check the category that applies:

  

					
	☐	  		  	a Canadian financial institution or a Schedule III bank of the Bank Act (Canada),
			
	☐	  		  	the Business Development Bank of Canada incorporated under the Business Development Bank of Canada Act (Canada),
			
	☐	  		  	a subsidiary of any person or company referred to in paragraphs (a) or (b) if the person or company owns all of the voting securities of the subsidiary, except the voting securities required by law to be owned by directors of
that subsidiary,
			
	☐	  		  	a person or company registered under the securities legislation of a province or territory of Canada as an adviser or dealer, except as otherwise prescribed by the regulations,
			
		  		  	[omitted]
			
		  	(e.1)	  	[omitted]
			
	☐	  		  	the Government of Canada, the government of a province or territory of Canada, or any Crown corporation, agency or wholly owned entity of the Government of Canada or of the government of a province or territory of Canada,
			
	☐	  		  	a municipality, public board or commission in Canada and a metropolitan community, school board, the Comité de gestion de la taxe scolaire de l’île de Montréal or an intermunicipal management board in
Québec,
			
	☐	  		  	any national, federal, state, provincial, territorial or municipal government of or in any foreign jurisdiction, or any agency of that government,
			
	☐	  	(i)	  	a pension fund that is regulated by either the Office of the Superintendent of Financial Institutions (Canada) or a pension commission or similar regulatory authority of a province or territory of Canada,
			
		  		  	[omitted]
			
	☐	  	(j.1)	  	an individual who beneficially owns financial assets having an aggregate realizable value that before taxes, but net of any related liabilities, exceeds CAD$5,000,000,
			
		  		  	[omitted]
			
		  		  	[omitted]
			
	☐	  		  	a person, other than an individual or investment fund, that has net assets of at least $5,000,000 as shown on its most recently prepared financial statements,
			
	☐	  		  	an investment fund that distributes or has distributed its securities only to
			
		  		  	a person that is or was an accredited investor at the time of the distribution,
			
		  		  	a person that acquires or acquired securities in the circumstances referred to in sections 2.10 of NI 45-106 [Minimum amount investment], or 2.19 of
NI 45-106 [Additional investment in investment funds], or
			
		  		  	a person described in paragraph (i) or (ii) that acquires or acquired securities under section 2.18 of NI 45-106 [Investment fund reinvestment],
			
	☐	  		  	an investment fund that distributes or has distributed securities under a prospectus in a jurisdiction of Canada for which the regulator or, in Québec, the securities regulatory authority, has issued a
receipt,

  
 II-4 

					
			
	☐	  		  	a trust company or trust corporation registered or authorized to carry on business under the Trust and Loan Companies Act (Canada) or under comparable legislation in a jurisdiction of Canada or a foreign jurisdiction, acting
on behalf of a fully managed account managed by the trust company or trust corporation, as the case may be,
			
	☐	  		  	a person acting on behalf of a fully managed account managed by that person, if that person is registered or authorized to carry on business as an adviser or the equivalent under the securities legislation of a jurisdiction of
Canada or a foreign jurisdiction,
			
	☐	  		  	a registered charity under the Income Tax Act (Canada) that, in regard to the trade, has obtained advice from an eligibility adviser or an adviser registered under the securities legislation of the jurisdiction of the
registered charity to give advice on the securities being traded,
			
	☐	  		  	an entity organized in a foreign jurisdiction that is analogous to any of the entities referred to in paragraphs (a) through (d) or paragraph (i) in form and function,
			
	☐	  		  	a person in respect of which all of the owners of interests, direct, indirect or beneficial, except the voting securities required by law to be owned by directors, are persons that are accredited investors,
			
	☐	  		  	an investment fund that is advised by a person registered as an adviser or a person that is exempt from registration as an adviser,
			
	☐	  		  	a person that is recognized or designated by the Commission as an accredited investor,
			
	☐	  		  	a trust established by an accredited investor for the benefit of the accredited investor’s family members of which a majority of the trustees are accredited investors and all of the beneficiaries are the accredited
investor’s spouse, a former spouse of the accredited investor or a parent, grandparent, brother, sister, child or grandchild of that accredited investor, of that accredited investor’s spouse or of that accredited investor’s former
spouse.

  

	12.	 We hereby represent, warrant, covenant and certify that we are, or any party on whose behalf we are acting is,
a “permitted client” by virtue of the criterion indicated below, 

 Please check the category that applies:

  

							
				
		 	☐	  	(a)	  	a Canadian financial institution or a Schedule III bank;
				
		 	☐	  	(b)	  	the Business Development Bank of Canada incorporated under the Business Development Bank of Canada Act (Canada);
				
		 	☐	  	(c)	  	a subsidiary of any person or company referred to in paragraph (a) or (b), if the person or company owns all of the voting securities of the subsidiary, except the voting securities required by law to be owned by directors of
the subsidiary;
				
		 	☐	  	(d)	  	a person or company registered under the securities legislation of a jurisdiction of Canada as an adviser, investment dealer, mutual fund dealer or exempt market dealer;
				
		 	☐	  	(e)	  	a pension fund that is regulated by either the Office of the Superintendent of Financial Institutions or a pension commission or similar regulatory authority of a jurisdiction of Canada or a wholly-owned subsidiary of such a pension
fund;
				
		 	☐	  	(f)	  	an entity organized in a foreign jurisdiction that is analogous to any of the entities referred to in paragraphs (a) through (e);
				
		 	☐	  	(g)	  	the Government of Canada or a jurisdiction of Canada, or any Crown corporation, agency or wholly-owned entity of the Government of Canada or a jurisdiction of Canada;
				
		 	☐	  	(h)	  	any national, federal, state, provincial, territorial or municipal government of or in any foreign jurisdiction, or any agency of that government;

  
 II-5 

							
				
		 	☐	  	(i)	  	a municipality, public board or commission in Canada and a metropolitan community, school board, the Comité de gestion de la taxe scolaire de l’île de Montréal or an intermunicipal management board in
Quebec;
				
		 	☐	  	(j)	  	a trust company or trust corporation registered or authorized to carry on business under the Trust and Loan Companies Act (Canada) or under comparable legislation in a jurisdiction of Canada or a foreign jurisdiction, acting on
behalf of a managed account managed by the trust company or trust corporation, as the case may be;
				
		 	☐	  	(k)	  	a person or company acting on behalf of a managed account managed by person or company, if the person or company is registered or authorized to carry on business as an adviser or the equivalent under the securities legislation of a
jurisdiction of Canada or a foreign jurisdiction;
				
		 	☐	  	(l)	  	 an investment fund if one or both of the following apply:
  

(i) the fund is managed by a person or company registered as an investment fund manager under the securities legislation of a jurisdiction of Canada;

 
 (ii) the fund is advised by a person or company authorized to act as an adviser under
the securities legislation of a jurisdiction of Canada;

				
		 	☐	  	(m)	  	in respect of a dealer, a registered charity under the Income Tax Act (Canada) that obtains advice on the securities to be traded from an eligibility adviser or an adviser registered under the securities legislation of the
jurisdiction of the registered charity;
				
		 	☐	  	(n)	  	in respect of an adviser, a registered charity under the Income Tax Act (Canada) that is advised by an eligibility adviser or an adviser registered under the securities legislation of the jurisdiction of the registered
charity;
				
		 	☐	  	(o)	  	a registered charity under the Income Tax Act (Canada) that obtains advice on the securities to be traded from an eligibility adviser or an adviser registered under the securities legislation of the jurisdiction of the registered
charity;
				
		 	☐	  	(p)	  	an individual who beneficially owns financial assets having an aggregate realizable value that, before taxes but net of any related liabilities, exceeds $5 million;
				
		 	☐	  	(q)	  	a person or company that is entirely owned by an individual or individuals referred to in paragraph (o), who holds the beneficial ownership interest in the person or company directly or through a trust, the trustee of which
is a trust company or trust corporation registered or authorized to carry on business under the Trust and Loan Companies Act (Canada) or under comparable legislation in a jurisdiction of Canada or a foreign jurisdiction;
				
		 	☐	  	(r)	  	a person or company, other than an individual or an investment fund, that has net assets of at least C$25,000,000 as shown on its most recently prepared financial statements; or
				
		 	☐	  	(s)	  	a person or company that distributes securities of its own issue in Canada only to persons or companies referred to in paragraphs (a) through (r).

  
 II-6EX-10.3

 Exhibit 10.3 

SPONSOR SUPPORT AGREEMENT 

This Sponsor Support Agreement (this “Sponsor Agreement”) is dated as of October 6, 2021, by and among
Supernova Partners II LLC, a Cayman Islands limited liability company (the “Sponsor Holdco”), the Persons set forth on Schedule I hereto (together with the Sponsor Holdco, each, a “Sponsor” and,
together, the “Sponsors”), Supernova Partners Acquisition Company II, Ltd., a Cayman Islands exempted company which shall domesticate as a Delaware corporation prior to the Closing in accordance with the Merger Agreement
(such entity, including the continuing corporation, “Acquiror”), and Rigetti Holdings, Inc., a Delaware corporation (the “Company” and collectively with the Sponsors and Acquiror, the
“Parties”). Capitalized terms used but not defined herein shall have the respective meanings ascribed to such terms in the Merger Agreement (as defined below). 

RECITALS 
 WHEREAS, as of
the date hereof, the Sponsors collectively are the holders of record and the “beneficial owners” (within the meaning of Rule 13d-3 under the Exchange Act) of 8,418,000 Acquiror
Class B Ordinary Shares and 4,450,000 Acquiror Warrants in the aggregate as set forth on Schedule I attached hereto (all such securities or other equity securities, together with any shares of Acquiror’s capital stock or other
equity securities of which ownership of record or the power to vote (including, without limitation, by proxy or power of attorney) is hereafter acquired by any such Sponsor during the period from the date hereof through the conclusion of the Interim
Period, including any and all Founder Shares, Founder Warrants and New Securities, are referred to herein as the “Subject Securities”); 

WHEREAS, contemporaneously with the execution and delivery of this Sponsor Agreement, Acquiror, Supernova Merger Sub, Inc., a Delaware
corporation (“First Merger Sub”), Supernova Romeo Merger Sub, LLC, a Delaware limited liability company (“Second Merger Sub” and, together with First Merger Sub, “Merger Subs”
and each, a “Merger Sub”) and the Company have entered into an Agreement and Plan of Merger (as amended, supplemented, restated or otherwise modified from time to time, the “Merger Agreement”), dated
as of the date hereof, pursuant to which, among other transactions, (i) Acquiror will domesticate as a Delaware corporation, (ii) First Merger Sub will merge with and into the Company (the “First Merger”), with the
Company surviving such First Merger as a wholly owned subsidiary of Acquiror, and (iii) 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 surviving such Second Merger as a wholly owned subsidiary of Acquiror, on the terms and
conditions set forth therein; and 
 WHEREAS, as an inducement to Acquiror and the Company to enter into the Merger Agreement and to
consummate the transactions contemplated therein, the parties hereto desire to agree to certain matters as set forth herein. 

 AGREEMENT 

NOW, THEREFORE, in consideration of the foregoing and the mutual agreements contained herein, and intending to be legally bound hereby, the
parties hereto hereby agree as follows: 
 ARTICLE I 

SPONSOR SUPPORT AGREEMENT; COVENANTS 

Section 1.1 Binding Effect of Merger Agreement. Each Sponsor hereby acknowledges that it has read the Merger Agreement and this
Sponsor Agreement and has had the opportunity to consult with its tax and legal advisors. Each Sponsor shall be bound by and comply with Sections 9.04(b) (Exclusivity) and 9.06 (Confidentiality; Publicity) of the Merger
Agreement (and any relevant definitions contained in any such sections) as if such Sponsor was an original signatory to the Merger Agreement with respect to such provisions and each reference to Acquiror in such provision referred to such Sponsor.

 Section 1.2 No Transfer. 

(a) Each Sponsor shall not, during the Interim Period (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 Subject Securities, (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 Subject Securities, 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 restrict Transfers (I) to (x) Acquiror’s officers or directors, (y) any affiliates or family members of Acquiror’s officers or directors, or (z) any members or partners of Sponsor Holdco or their
affiliates, any affiliates of Sponsor Holdco, or any employees of such affiliates; (II) in the case of an individual, by gift to a member of such individual’s immediate family or to a trust, the beneficiary of which is a member of such
individual’s immediate family, an affiliate of such individual or to a charitable organization; (III) in the case of an individual, by virtue of laws of descent and distribution upon death of such individual; or (IV) in the case of an
individual, pursuant to a qualified domestic relations order; provided, further, that any such 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 the Company, to assume all of the obligations of the transferor under, and be bound by all of the terms of, this Sponsor Agreement; provided, further, that any Transfer permitted under this
Section 1.2 shall not relieve the transferor of its obligations under this Sponsor Agreement. Any Transfer in violation of this Section 1.2 shall be null and void. 

(b) As used in this Sponsor Agreement, Subject Securities shall include any and all Acquiror Class B Ordinary Shares that a Sponsor
currently or hereafter beneficially owns prior to the Domestication, including the Acquiror Class B Ordinary Shares set forth on Schedule I attached hereto, and for all periods after completion of the Domestication, any and all shares of
Domesticated Acquiror Common Stock that a Sponsor currently or hereafter 

  
 2 

 
beneficially owns, including the shares of Domesticated Acquiror Common Stock issued upon conversion of the Acquiror Class B Ordinary Shares set forth on Schedule I attached hereto
(collectively, the “Founder Shares”), and any and all Acquiror Warrants that a Sponsor currently or hereafter beneficially owns prior to the Domestication, including the Acquiror Warrants set forth on Schedule I
attached hereto, and (y) for all periods after completion of the Domestication, any and all Domesticated Acquiror Warrants, including the Domesticated Acquiror Warrants issued upon conversion of the Acquiror Warrants set forth on Schedule
I attached hereto (collectively, the “Founder Warrants”). 
 Section 1.3 New Shares. In the event
that (a) any Acquiror Shares, Acquiror Warrants or other equity securities of Acquiror are issued to a Sponsor during the Interim Period pursuant to any stock dividend, stock split, recapitalization, reclassification, combination or exchange of
Acquiror Shares, Acquiror Warrants of, on or affecting any Acquiror Shares or Acquiror Warrants owned by such Sponsor or otherwise, (b) a Sponsor purchases or otherwise acquires beneficial ownership of any Acquiror Shares , Acquiror
Warrants or other equity securities of Acquiror after the date of this Sponsor Agreement, or (c) a Sponsor acquires the right to vote or share in the voting of any Acquiror Shares or other equity securities of Acquiror during the Interim Period
(such Acquiror Shares, Acquiror Warrants or other equity securities of Acquiror, collectively the “New Securities”), then such New Securities acquired or purchased by such Sponsor shall be subject to the terms of this Sponsor
Agreement to the same extent as if they constituted the Subject Securities owned by such Sponsor as of the date hereof. 
 Section 1.4
Closing Date Deliverables. On the Closing Date, the Sponsor Holdco shall deliver to Acquiror and the Company a duly executed copy of that certain Amended and Restated Registration Rights Agreement, by and among Acquiror, the Company, the
Sponsor Holdco and certain of the Company’s stockholders or their respective affiliates, as applicable, in substantially the form attached as Exhibit C to the Merger Agreement. 

Section 1.5 Sponsor Agreements. 

(a) During the Interim Period, at any duly called meeting of the shareholders of Acquiror or at any adjournment thereof, or in any other
circumstance in which the vote, consent or other approval of the shareholders of Acquiror is sought, in each case, as contemplated by the Merger Agreement, each Sponsor shall (i) appear at each such meeting or otherwise cause all of its Subject
Securities that are entitled to vote on such matter at such meeting to be counted as present thereat for purposes of calculating a quorum and (ii) vote (or cause to be voted), or execute and deliver a written consent (or cause a written consent
to be executed and delivered) covering, all of its Subject Securities that are entitled to vote on such matter: 
 (i) in
favor of the Transactions; 
 (ii) against any Business Combination Proposal or any proposal relating to a Business
Combination Proposal (in each case, other than the Transactions); 

  
 3 

 (iii) against any merger agreement or merger (other than the Merger
Agreement and the Merger), consolidation, combination, sale of substantial assets, reorganization, recapitalization, dissolution, liquidation or winding up of or by Acquiror; 

(iv) against any change in the business, management or Board of Directors of Acquiror (other than in connection with the
Acquiror Shareholder Matters); and 
 (v) against any proposal, action or agreement that would (A) impede, frustrate,
prevent or nullify any provision of this Sponsor Agreement, the Merger Agreement or any Merger, (B) result in a breach in any respect of any covenant, representation, warranty or any other obligation or agreement of Acquiror or Merger Sub under
the Merger Agreement, (C) result in any of the conditions set forth in Section 10.03 of the Merger Agreement not being fulfilled or (D) change in any manner the dividend policy or capitalization of, including the voting rights of any
class of capital stock of, Acquiror. 
 Each Sponsor hereby agrees that it shall not commit or agree to take any action inconsistent with
the foregoing. The obligations of each Sponsor specified in this Section 1.5 shall apply whether or not any Acquiror Change in Recommendation occurs. 

(b) Each Sponsor shall comply with, and fully perform all of its obligations, covenants and agreements set forth in, the Insider Letter,
including the obligations of the Sponsors pursuant to Section 3 therein to not redeem any Founder Shares owned by such Sponsor in connection with the transactions contemplated by the Merger Agreement, and each Sponsor hereby further agrees that
such Sponsor shall not redeem any Subject Securities owned by such Sponsor in connection with any shareholder approval of the Transactions and hereby waives any and all rights to elect or effect any Acquiror Shareholder Redemption arising in
connection with the Transactions. 
 (c) During the Interim Period, each Sponsor shall not modify or amend any Contract between or among
such Sponsor, anyone related by blood, marriage or adoption to such Sponsor or any Affiliate of such Sponsor (other than Acquiror or any of its Subsidiaries), on the one hand, and Acquiror or any of Acquiror’s Subsidiaries, on the other hand,
including, for the avoidance of doubt, the Insider Letter. 
 (d) Each Sponsor hereby agrees that such Sponsor shall waive, and hereby does
waive, any and all anti-dilution or similar rights (if any) that may otherwise be available under applicable Law or pursuant to any Contract between or among such Sponsor or any Affiliate of such Sponsor (other than Acquiror or any of its
Subsidiaries), on the one hand, and Acquiror or any of Acquiror’s Subsidiaries, on the other hand, with respect to the transactions contemplated by the Merger Agreement, including the PIPE Investment, and that it shall not take any action in
furtherance of exercising any such rights. 

  
 4 

 (e) Each Sponsor hereby waives any and all rights to convert any loans, borrowings, notes
or other funds advanced by such Sponsor or any of its Affiliates to Acquiror or any of its Subsidiaries prior to the Closing (a “Working Capital Loan”) into warrants or other securities (derivative or otherwise) of any
Acquiror Party or the Company, including any and all rights to convert any such Working Capital Loans in accordance with the Insider Letter, any applicable warrant agreement, the Governing Documents of the Acquiror Parties or any other Contract, and
Acquiror take such necessary or appropriate actions within its power so as to ensure, that each and any Working Capital Loan shall be repaid solely in cash subject to, and upon the consummation of the Closing. 

(f) No Actions to Breach Agreement. No Sponsor shall take any action that would make any representation or warranty of such Sponsor contained
herein untrue or incorrect or have the effect of preventing or disabling such Sponsor from performing its obligations under this Sponsor Agreement. 

(g) Maintenance of Records. Each Sponsor hereby authorizes Acquiror and the Company to maintain a copy of this Agreement at either its
executive office or registered office. 
 (h) Update of Schedule I. If any Sponsor acquires record or beneficial ownership of any New
Securities during the Interim Period (or becomes aware, during the Interim Period, of its record or beneficial ownership of any Subject Securities, which securities are not already set forth on Schedule I), such Sponsor shall promptly notify the
Company and Acquiror in writing, and Schedule I shall be updated to reflect such Sponsor’s ownership of such New Securities or Subject Securities, as applicable. 

Section 1.6 No Inconsistent Agreement. Each Sponsor hereby represents and covenants that such Sponsor has not entered into, and
shall not enter into, any agreement that would restrict, limit or interfere with the performance of such Sponsor’s obligations hereunder. 

ARTICLE II 
 LOCK-UP AND VESTING 
 Section 2.1 Lock-Up.

 (a) Subject to Section 2.1(b), each Sponsor hereby agrees that such Sponsor shall not Transfer any Lock-up Shares until the end of the Lock-up Period (the “Lock-up”). 

(b) Notwithstanding the provisions set forth in Section 2.1(a), each Sponsor or its Permitted Transferees may Transfer the Lock-up Shares during the Lock-up Period (i) to (A) Acquiror’s officers or directors, (B) any Affiliates or family members of Acquiror’s officers or
directors, or (C) any members or partners of Sponsor Holdco or their Affiliates, any Affiliates of Sponsor Holdco, or any employees of such Affiliates; (ii) in the case of an individual, by gift to a member of such individual’s
immediate family or to a trust, the beneficiary of which is a member of such individual’s immediate family, an Affiliate of such individual or to a charitable organization; (iii) in the case of an individual, by virtue of laws of descent
and distribution upon death of such individual; (iv) in the case of an individual, pursuant to a qualified domestic relations order; (v) by virtue of the laws of the State of Delaware or the Sponsor Holdco’s limited liability company
agreement upon dissolution of the Sponsor; or (vi) 

  
 5 

 
in the event of Acquiror’s liquidation, merger, capital stock exchange or other similar transaction which results in all of Acquiror’s stockholders having the right to exchange their
shares of Domesticated Acquiror Common Stock for cash, securities or other property subsequent to the Closing Date; provided, that each transferee contemplated by clauses (i) through (vii) (each, a “Permitted
Transferee”) must agree in writing to be bound by the Lock-up. 
 (c) The Lock-up in this Section 2.1 shall supersede the lock-up provisions contained in Section 5 of the Insider Letter, which provisions in
Section 5 of the Insider Letter shall be of no further force or effect. 
 (d) For purposes of this Section 2.1: 

(i) the term “Lock-up Period” means the period beginning on
the Closing Date (as defined in the Merger Agreement) and ending on the earlier to occur of (A) six months after the Closing Date, (B) such date that the closing price of Domesticated Acquiror Common Stock equals or exceeds $12.00 per
share (as adjusted for stock splits, stock dividends, reorganizations, recapitalizations and the like) for any 20 trading days within any period of 30 consecutive trading days commencing at least 90 calendar days following the Closing Date and
(C) the date on which Acquiror consummates a sale, merger, liquidation, exchange offer or other similar transaction after the Closing Date that results in the stockholders of Acquiror immediately prior to such transaction having beneficial
ownership of less than 50% of the outstanding voting securities of Acquiror, directly or indirectly, immediately following such transaction which results in its stockholders having the right to exchange their shares of Domesticated Acquiror Common
Stock for cash, securities or other property having a value that equals or exceeds $12.00 per share; 
 (ii) the term
“Lock-up Shares” means the Founder Shares and Founder Warrants (including the Founder Shares issuable upon exercise thereof) held by each Sponsor immediately following the Closing
(other than Domesticated Acquiror Common Stock acquired in the public market or pursuant to a transaction exempt from registration under the Securities Act of 1933, as amended, pursuant to a subscription agreement where the issuance of Domesticated
Acquiror Common Stock occurs on or after the Closing); provided, that, for clarity, Domesticated Acquiror Common Stock issued in connection with the PIPE Investment shall not constitute Lock-up Shares;

 (iii) the term “Permitted Transferees” means, prior to the expiration of the Lock-up Period, any person or entity to whom such Sponsor is permitted to transfer such Lock-up Shares prior to the expiration of the
Lock-up Period pursuant to Section 1.8(b); and 
 (iv) the
term “Insider Letter” means that certain Letter Agreement, dated March 1, 2021, by and among Acquiror, its current executive officers and directors, and Sponsor Holdco, as may be amended. 

Section 2.2 Vesting.  

  
 6 

 (a) Each of the Sponsors agrees that, as of immediately prior to (but subject to) the
Closing, the Sponsor Vesting Shares shall be unvested and shall be subject to the vesting and forfeiture provisions set forth in this Section 2.2. 

(b) The Sponsor Vesting Shares shall vest (and shall not be subject to forfeiture) upon the occurrence of the Triggering Event. If the
Triggering Event does not occur on or prior to the expiration of the Vesting Period, the Sponsor Vesting Shares shall not vest, and shall be forfeited and deemed transferred by the forfeiting holder to Acquiror and shall be cancelled by Acquiror and
cease to exist. 
 (c) In the event that there is a Company Sale during the Vesting Period that will result in all of the holders of
Domesticated Acquiror Common Stock receiving a Company Sale Price, in the form of cash or marketable securities (or any combination thereof), that is at least equal to or in excess of the applicable Trading Threshold per share (a
“Triggering Company Sale”), then immediately prior to the consummation of such Triggering Company Sale, if the Triggering Event has not previously occurred, the Triggering Event shall be, and the related vesting conditions
with respect to the Sponsor Vesting Shares shall also be, deemed to have occurred upon the consummation of such Triggering Company Sale and the holders of such Sponsor Vesting Shares shall be eligible to participate in such Triggering Company Sale,
in each case, if and to the extent that the consideration paid per share of Domesticated Acquiror Common Stock in such Triggering Company Sale is at least equal to the applicable Trading Threshold per share. For avoidance of doubt, in the event
there is a Company Sale during the Vesting Period and the Triggering Event has not occurred prior to such Company Sale: (i) if the applicable Company Sale Price for acquisition of the Domesticated Acquiror Common Stock is greater than or equal
to $12.50 per share of Domesticated Acquiror Common Stock but less than $15.00 per share of Domesticated Acquiror Common Stock, the Sponsor Vesting Shares that are not Sponsor Redemption-Based Vesting Shares shall be deemed to have fully vested; and
(ii) if the applicable Company Sale Price for acquisition of the Domesticated Acquiror Common Stock is greater than or equal to $15.00 per share of Domesticated Acquiror Common Stock, all Sponsor Vesting Shares shall be deemed to have fully
vested. 
 (d) Subject to the limitations contemplated herein, the Sponsors shall have all of the rights of a stockholder of Acquiror with
respect to the Founder Shares, including the right to receive dividends and/or distributions made to the holders of Domesticated Acquiror Common Stock and to voting rights generally granted to holders of Domesticated Acquiror Common Stock;
provided, however, that, subject to Section 2.2(c), the unvested Sponsor Vesting Shares shall not entitle the holder thereof to consideration in connection with any sale or other transaction and may not be offered, sold,
transferred, redeemed, assigned, pledged, hypothecated, encumbered or otherwise disposed of (whether by operation of law or otherwise) by the Sponsors, as the case may be, or be subject to execution, attachment or similar process, and shall bear a
customary legend with respect to such transfer restrictions. Any attempt to so sell, transfer, assign, pledge, hypothecate, encumber or otherwise dispose of such unvested Sponsor Vesting Shares shall be null and void. 

  
 7 

 (e) If, and as often as, there are any changes in Acquiror or the Founder Shares by way of
stock split, stock dividend, combination or reclassification, or through a Company Sale or other merger, consolidation, reorganization, recapitalization or business combination, or by any other means, equitable adjustment shall be made to the
provisions of this Sponsor Agreement (including, if applicable, the dollar amounts set forth in the definition of “Trading Threshold”) as may be required so that the rights, privileges, duties and obligations hereunder
(including the vesting rights with respect to the Sponsor Vesting Shares in this Section 2.2) shall continue with respect to Acquiror, Acquiror’s successor or the surviving entity of such transaction and the Founder Shares, each as so
changed. Each of the Sponsors will promptly inform the Company of any elections made by such Sponsor under Section 83(b) of the Internal Revenue Code in connection with the Closing with respect to Founder Shares held by such Sponsor. 

(f) Each Sponsor hereby agrees that, with respect to all of its unvested Founder Shares, such Founder Shares shall be present at all
stockholder meetings for purposes of a quorum and voted at all such meetings, or voted, consented or approved in any other circumstances, upon which such vote, consent or other approval (including providing any written consent as of any specified
date) is sought or obtained by or from the stockholders of Acquiror, in the same manner (including by voting “for” or “against,” abstaining or withholding votes) as, and in the same proportion to, the votes cast “for”
or “against,” and abstentions or vote withholdings made, in respect of all shares of Domesticated Acquiror Common Stock, held by the holders thereof (other than the unvested Founder Shares). 

(g) Any economic rights (including rights to dividends) of unvested Founder Shares shall be set aside for so long as such unvested Founder
Shares remain unvested. Should unvested Founder Shares become vested in accordance with subsection (c) above, such Founder Shares shall become entitled to all such economic rights that were set aside during the unvested period, including in the
form of a lump sum payment of all dividends that were set aside, together with interest on such set-aside dividends, at the prime rate published in The Wall Street Journal for the relevant date each such
dividend was set aside through the date of the lump sum payment. 
 (h) For purposes of this Section 2.2: 

(i) “Company Sale” means (which, for the avoidance of doubt, shall not include the Transactions): (x)
any transaction or series of related transactions following the Closing that results in any Person or “group” (within the meaning of Section 13(d)(3) of the Exchange Act) acquiring Equity Securities that represent more
than 50% of the total voting power of the then outstanding voting securities of Acquiror (or the equity interests of the surviving Person outstanding immediately after such transaction or transactions) or (y) a sale or disposition following the
Closing of all or substantially all of the assets of Acquiror and its Subsidiaries on a consolidated basis, in each case other than a transaction or series of related transactions which results in at least 50% of the combined voting power of the
then outstanding voting securities of Acquiror (or any successor to Acquiror) immediately following the closing of such transaction (or 

  
 8 

 
series of related transactions) being beneficially owned, directly or indirectly, by individuals and entities (or Affiliates of such individuals and entities) who were the beneficial owners,
respectively, of Equity Securities representing more than 50% of the total voting power of the then outstanding voting securities of Acquiror immediately prior to such transaction (or series of related transactions). 

(ii) “Company Sale Price” means the price per share for Domesticated Acquiror Common Stock in a
Company Sale. In the event of a Company Sale of a type described in clause (y) of the definition thereof, or if and to the extent the price paid per share in a Company Sale includes any escrows, holdbacks, deferred purchase price, earnouts or
other contingent consideration, Acquiror’s Board of Directors shall determine the price paid per share of Domesticated Acquiror Common Stock in such Company Sale in good faith. If and to the extent the price is payable in whole or in part with
consideration other than cash, the price for such non-cash consideration shall be determined as follows: (x) with respect to any securities: (A) the average of the closing prices of the sales of the
securities on all securities exchanges on which the securities may at the time be listed averaged over a period of twenty-one (21) days consisting of the day as of which such value is being determined and
the twenty (20) consecutive business days prior to such day or (B) if the information in (A) is not practically available, the value of each such security shall be equal to the fair value thereof as of the date of valuation as
determined by an independent, nationally recognized investment banking firm to be appointed with the mutual approval of Acquiror and the Company on the basis of an orderly sale to a willing, unaffiliated buyer in an
arm’s-length transaction, taking into account all factors determinative of value as the investment banking firm determines relevant (and, in the case of clause (A) or (B), reduced by the amount of
any transfer Taxes payable in connection with such sale) and (y) with respect to any other non-cash assets, the fair value thereof as of the date of valuation as determined by an independent, nationally
recognized investment banking firm to be appointed with the mutual approval of Acquiror and the Company on the basis of an orderly sale to a willing, unaffiliated buyer in an arm’s-length transaction,
taking into account all factors determinative of value as the investment banking firm determines relevant (and reduced by the amount of any transfer Taxes payable in connection with such sale). 

(iii) “Promote Sponsor Vesting Shares” means 2,479,000 Founder Shares. 

(iv) “Redeemable Shares” means the issued and outstanding Acquiror Class A Ordinary Shares that
are entitled to exercise their right to cause Acquiror to redeem all of such Acquiror Class A Ordinary Shares pursuant to the Governing Documents of Acquiror, excluding, for the avoidance of doubt, any Class A Ordinary Shares that are
Subject Securities. 
 (v) “Sponsor Redemption-Based Vesting Shares” means a number of Founder
Shares (A) equal to 1,000,000 Founder Shares, if and only if holders of one hundred percent (100%) of the Redeemable Shares exercise their right to cause Acquiror to redeem such Redeemable Shares pursuant to the Governing Documents of Acquiror,
and the Transactions are consummated notwithstanding such Acquiror 

  
 9 

 
Shareholder Redemption, (B) determined by straight-line interpolation between 1,000,000 Founder Shares with respect to one hundred percent (100%) redemption of the Redeemable Shares (at
which the number of Founder Shares subject to this clause (B) would be 1,000,000) and 0 Founder Shares with respect to redemptions of less than twenty percent (20%) of the Redeemable Shares, if and only if the holders of more twenty percent
(20%) of the Redeemable Shares exercise their right to cause Acquiror to redeem such Redeemable Shares pursuant to the Governing Documents of Acquiror but less than one hundred percent (100%) of the holders of Redeemable Shares exercise their right
to cause Acquiror to redeem all of such Redeemable Shares pursuant to the Governing Documents of Acquiror, and (C) 0 Founder Shares, if and only if the holders of twenty percent (20%) or less of the Redeemable Shares exercise their right to cause
Acquiror to redeem such Redeemable Shares pursuant to the Governing Documents of Acquiror. 
 (vi) “Sponsor
Vesting Shares” means the Promote Sponsor Vesting Shares and the Sponsor Redemption-Based Vesting Shares, if any. 

(vii) “Trading Day” means any day on which shares of Domesticated Acquiror Common Stock are actually
traded on the principal securities exchange or securities market on which shares of Domesticated Acquiror Common Stock are then traded. 

(viii) “Trading Threshold” means (A) in the case of the Promote Sponsor Vesting Shares, $12.50,
and (B) in the case of Sponsor Vesting Shares that are Sponsor Redemption-Based Vesting Shares, $15.00. 
 (ix)
“Triggering Event” means the date following the Closing but prior to the expiration of the Vesting Period on which the daily volume-weighted average sale price of one share of Domesticated Acquiror Common Stock quoted on NYSE
(or the exchange on which the shares of Domesticated Acquiror Common Stock are then listed) is, for the first time, greater than or equal to the applicable Trading Threshold for any twenty (20) Trading Days (which may or may not be consecutive)
within any thirty (30) consecutive Trading Day period within the Vesting Period; provided, that, for the avoidance of doubt, (i) any Trading Days that meet the applicable Trading Threshold for both Sponsor Redemption-Based Vesting
Shares and other Sponsor Vesting Shares will count towards the twenty (20) day threshold for each of the Sponsor Redemption-Based Shares and the other Sponsor Vesting Shares and (ii) a Triggering Event may occur with respect to both the
Sponsor Redemption-Based Vesting Shares and other Sponsor Vesting Shares at the same, or over some or all of the same period of, time. 

(x) “Vesting Period” means the period beginning at the Closing and ending on the fifth (5th)
anniversary of the Closing Date. 

  
 10 

 ARTICLE III 

REPRESENTATIONS AND WARRANTIES 

Section 3.1 Representations and Warranties of the Sponsors. Each Sponsor represents and warrants as of the date hereof to Acquiror
and the Company (solely with respect to itself, himself or herself and not with respect to any other Sponsor) as follows: 
 (a)
Organization; Due Authorization. If such Sponsor is not an individual, it is duly organized, validly existing and in good standing under the Laws of the jurisdiction in which it is incorporated, formed, organized or constituted, and the
execution, delivery and performance of this Sponsor Agreement and the consummation of the transactions contemplated hereby are within such Sponsor’s corporate, limited liability company or organizational powers and have been duly authorized by
all necessary corporate, limited liability company or organizational actions on the part of such Sponsor. If such Sponsor is an individual, such Sponsor has full legal capacity, right and authority to execute and deliver this Sponsor Agreement and
to perform his or her obligations hereunder. This Sponsor Agreement has been duly executed and delivered by such Sponsor and, assuming due authorization, execution and delivery by the other parties to this Sponsor Agreement, this Sponsor Agreement
constitutes a legally valid and binding obligation of such Sponsor, enforceable against such Sponsor in accordance with the terms hereof subject to the Enforceability Exceptions. If this Sponsor Agreement is being executed in a representative or
fiduciary capacity, the Person signing this Sponsor Agreement has full power and authority to enter into this Sponsor Agreement on behalf of the applicable Sponsor. 

(b) Ownership. Such Sponsor is the record and beneficial owner (as defined in the Securities Act) of, and has good title to, all of
such Sponsor’s Subject Securities, and there exist no Liens or any other limitation or restriction (including any restriction on the right to vote, sell or otherwise dispose of such Subject Securities (other than transfer restrictions under the
Securities Act)) affecting any such Subject Securities, other than Liens pursuant to (i) this Sponsor Agreement, (ii) the Acquiror Governing Documents, (iii) the Merger Agreement or (iv) any applicable securities Laws. Such
Sponsor’s Subject Securities are the only equity securities in Acquiror owned of record or beneficially by such Sponsor on the date of this Sponsor Agreement. Other than the Founder Warrants, such Sponsor does not hold or own any rights to
acquire (directly or indirectly) any equity securities of Acquiror or any equity securities convertible into, or which can be exchanged for, equity securities of Acquiror. 

(c) Voting Rights. Such Sponsor (i) has the right to vote, dispose of and to issue instructions with respect to the matters set forth
herein, whether by ownership or by proxy, in each case, with respect to such Sponsor’s Subject Securities, (ii) has not entered into any voting agreement or voting trust that is inconsistent with such Sponsor’s obligations pursuant to
this Sponsor Agreement, (iii) has not granted a proxy or power of attorney with respect to any of such Sponsor’s Subject Securities that is inconsistent with such Sponsor’s obligations pursuant to this Agreement, 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 Sponsor Agreement. None of such Sponsor’s Subject Securities are
subject to any proxy, voting trust or other agreement or arrangement with respect to the voting of such Subject Securities, except as provided hereunder and under the Insider Letter. 

  
 11 

 (d) Filings. 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 Sponsor to, or to be made by such Sponsor with, any Governmental Authority in connection with the execution, delivery and performance by such Sponsor of this Sponsor Agreement, the consummation of the transactions contemplated hereby or the
Transactions. 
 (e) No Conflicts. The execution and delivery of this Sponsor Agreement by such Sponsor does not, and the
performance by such Sponsor of his, her or its obligations hereunder will not, constitute or result in (i) a breach or violation of, or a default under, the Governing Documents of such Sponsor (if such Sponsor is not a natural person) or the
rights of such Sponsor’s spouse or domestic partner (if such Sponsor 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 Sponsor pursuant to any Contract
binding upon such Sponsor or, assuming (solely with respect to performance of this Sponsor Agreement and the transactions contemplated hereby), compliance with the matters referred to in Section 3.1(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 Sponsor or such Sponsor’s Subject Securities) 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 Sponsor’s ability to perform its obligations under this Sponsor Agreement or to consummate the transactions contemplated hereby or the Transactions. 

(f) Litigation. There are no Actions pending against such Sponsor, or to the knowledge of such Sponsor threatened against such
Sponsor, before (or, in the case of threatened Actions, that would be before) any arbitrator or any Governmental Authority, which in any manner challenges or seeks to prevent, enjoin or materially delay the performance by such Sponsor of its, his or
her obligations under this Sponsor Agreement. 
 (g) Brokerage Fees. Except as described on Section 6.07 of the Acquiror
Disclosure Letter, no broker, finder, investment banker or other Person is entitled to any brokerage fee, finders’ fee or other commission in connection with the transactions contemplated by the Merger Agreement based upon arrangements made by
such Sponsor, for which Acquiror or any of its Affiliates may become liable. 
 (h) Affiliate Arrangements. Except as set forth on
Schedule II attached hereto, neither such Sponsor nor any anyone related by blood, marriage or adoption to such Sponsor or, to the knowledge of such Sponsor, any Person in which such Sponsor has a direct or indirect legal, contractual or
beneficial ownership of five percent (5%) or greater is party to, or has any rights with respect to or arising from, any Contract with Acquiror or its Subsidiaries. 

  
 12 

 (i) Loans and Advances. Such Sponsor represents and warrants that, as of the date
hereof, there are no outstanding Working Capital Loans. 
 (j) Acknowledgment. Such Sponsor understands and acknowledges that each
of Acquiror and the Company is entering into the Merger Agreement in reliance upon such Sponsor’s execution and delivery of this Sponsor Agreement. 

ARTICLE IV 

MISCELLANEOUS 

Section 4.1 Termination. This Sponsor Agreement and all of its provisions shall terminate and be of no further force or effect
upon the earliest of (a) the termination of the Merger Agreement in accordance with its terms in circumstances where the Closing does not occur, (b) if the Closing occurs, then the provisions set forth in ARTICLE I and ARTICLE III shall
terminate upon such Closing and the provisions set forth in ARTICLE II and this ARTICLE IV shall survive the Closing, and shall terminate upon the latter of (A) the expiration of the Lock-up Period and
(B) the earlier to occur of (I) the occurrence (or deemed occurrence) of a Triggering Event or Triggering Company Sale on or before the conclusion of the Vesting Period and (II) the conclusion of the Vesting Period, and upon such
termination, this Sponsor Agreement shall forthwith become void and have no further force or effect, without any liability on the part of any Party and (c) the written agreement of the Sponsor, Acquiror and the Company. Upon such termination of
this Sponsor Agreement, all obligations of the parties under this Sponsor Agreement will terminate, without any liability or other obligation on the part of any party hereto to any Person in respect hereof or the transactions contemplated hereby,
and no party hereto shall have any claim against another (and no person shall have any rights against such party), whether under contract, tort or otherwise, with respect to the subject matter hereof; provided, however, that the
termination of this Sponsor Agreement shall not relieve any party hereto from liability arising in respect of any breach of this Sponsor Agreement prior to such termination. Notwithstanding the foregoing, ARTICLE IV shall survive the termination of
this Sponsor Agreement. 
 Section 4.2 Governing Law. This Sponsor Agreement, and all claims or causes of action (whether in
contract or tort) that may be based upon, arise out of or relate to this Sponsor Agreement or the negotiation, execution or performance of this Sponsor Agreement (including any claim or cause of action based upon, arising out of or related to any
representation or warranty made in or in connection with this Sponsor Agreement) will be governed by and construed in accordance with the internal Laws of the State of Delaware applicable to agreements executed and performed entirely within such
State, 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. 
 Section 4.3 CONSENT TO JURISDICTION AND SERVICE OF PROCESS; WAIVER OF JURY TRIAL. 

  
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 (a) THE PARTIES TO THIS SPONSOR AGREEMENT SUBMIT TO THE EXCLUSIVE JURISDICTION OF THE STATE
COURTS LOCATED IN WILMINGTON, DELAWARE OR THE COURTS OF THE UNITED STATES LOCATED IN WILMINGTON, DELAWARE IN RESPECT OF THE INTERPRETATION AND ENFORCEMENT OF THE PROVISIONS OF THIS SPONSOR AGREEMENT AND ANY RELATED AGREEMENT, CERTIFICATE OR OTHER
DOCUMENT DELIVERED IN CONNECTION HEREWITH AND BY THIS SPONSOR AGREEMENT WAIVE, AND AGREE NOT TO ASSERT, ANY DEFENSE IN ANY ACTION FOR THE INTERPRETATION OR ENFORCEMENT OF THIS SPONSOR AGREEMENT AND ANY RELATED AGREEMENT, CERTIFICATE OR OTHER
DOCUMENT DELIVERED IN CONNECTION HEREWITH, THAT THEY ARE NOT SUBJECT THERETO OR THAT SUCH ACTION MAY NOT BE BROUGHT OR IS NOT MAINTAINABLE IN SUCH COURTS OR THAT THIS SPONSOR AGREEMENT MAY NOT BE ENFORCED IN OR BY SUCH COURTS OR THAT THEIR PROPERTY
IS EXEMPT OR IMMUNE FROM EXECUTION, THAT THE ACTION IS BROUGHT IN AN INCONVENIENT FORUM, OR THAT THE VENUE OF THE ACTION IS IMPROPER. SERVICE OF PROCESS WITH RESPECT THERETO MAY BE MADE UPON ANY PARTY TO THIS SPONSOR AGREEMENT BY MAILING A COPY
THEREOF BY REGISTERED OR CERTIFIED MAIL, POSTAGE PREPAID, TO SUCH PARTY AT ITS ADDRESS AS PROVIDED IN SECTION 3.8. 

(b) WAIVER OF TRIAL BY JURY. EACH PARTY HERETO HEREBY ACKNOWLEDGES AND AGREES THAT ANY CONTROVERSY WHICH MAY ARISE UNDER THIS SPONSOR
AGREEMENT IS LIKELY TO INVOLVE COMPLICATED AND DIFFICULT ISSUES, AND THEREFORE EACH SUCH PARTY HEREBY IRREVOCABLY AND UNCONDITIONALLY WAIVES ANY RIGHT SUCH PARTY MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY LITIGATION DIRECTLY OR INDIRECTLY ARISING
OUT OF OR RELATING TO THIS SPONSOR AGREEMENT OR THE TRANSACTIONS CONTEMPLATED BY THIS SPONSOR AGREEMENT. EACH PARTY CERTIFIES AND ACKNOWLEDGES THAT (I) NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY OR
OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVER, (II) EACH SUCH PARTY UNDERSTANDS AND HAS CONSIDERED THE IMPLICATIONS OF THIS WAIVER, (III) EACH SUCH PARTY MAKES THIS WAIVER
VOLUNTARILY AND (IV) EACH SUCH PARTY HAS BEEN INDUCED TO ENTER INTO THIS SPONSOR AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS SECTION 3.3. 

Section 4.4 Assignment. This Sponsor Agreement and all of the provisions hereof will be binding upon and inure to the benefit of
the parties hereto and their respective heirs, successors and permitted assigns. Neither this Sponsor Agreement nor any of the rights, interests or obligations hereunder will be assigned (including by operation of law) without the prior written
consent of the parties hereto. 
 Section 4.5 Specific Performance. 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 Sponsor Agreement were not performed in accordance
with their specific 

  
 14 

 
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 Sponsor Agreement and to enforce specifically the terms and provisions of this Sponsor Agreement, including each Sponsor’s obligations under Section 1.5(a), 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 Sponsor 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. 

Section 4.6 Amendment. This Sponsor Agreement may not be amended, changed, supplemented, waived or otherwise modified or
terminated, except upon the execution and delivery of a written agreement executed by Acquiror, the Company and the Sponsor Holdco. 

Section 4.7 Severability. If any provision of this Sponsor Agreement is held invalid or unenforceable by any court of competent
jurisdiction, the other provisions of this Sponsor Agreement will remain in full force and effect. Any provision of this Sponsor Agreement held invalid or unenforceable only in part or degree will remain in full force and effect to the extent not
held invalid or unenforceable. 
 Section 4.8 Notices. All notices and other communications among the parties hereto shall be in
writing and shall be deemed to have been duly given (a) when delivered in person, (b) when delivered after posting in the United States mail having been sent registered or certified mail return receipt requested, postage prepaid,
(c) when delivered by FedEx or other nationally recognized overnight delivery service or (d) when e-mailed during normal business hours (and otherwise as of the immediately following Business Day),
addressed as follows: 
 If to Acquiror: 

Supernova Partners Acquisition Company II, Ltd. 

4301 50th Street, NW 

Suite 300, PMB 1044 

Washington, DC 20016 

Attn: Robert Reid, CEO; Michael S. Clifton, CFO 

E-mail: robert@supernovaspac.com; michael@supernovaspac.com 

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

Latham & Watkins LLP 

555 Eleventh Street, NW 

Suite 1000 

  
 15 

 Washington, DC 20004-1304 

Attn: Nicholas P. Luongo; Ryan J. Maierson; Patrick H. Shannon 

E-mail: nick.luongo@lw.com; ryan.maierson@lw.com; patrick.shannon@lw.com 

If to the Company: 

RigettiHoldings, Inc. 

775 Heinz Avenue 

Berkeley, CA 94710 

Attention:    Chad Rigetti; Taryn Naidu; Rick Danis 

Email:         chad@rigetti.com; taryn@rigetti.com; rick@rigetti.com 

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

Cooley LLP 

55 Hudson Yards 

New York, NY 10001-2157 

Attention:    Adam Dinow; David Silverman; Rupa Briggs 

Email:          adinow@cooley.com; david.silverman@cooley.com;

 rbriggs@cooly.com 

If to a Sponsor: 

To such Sponsor’s address set forth in Schedule I 

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

Latham & Watkins LLP 

555 Eleventh Street, NW 

Suite 1000 

Washington, DC 20004-1304 

Attn: Nicholas P. Luongo; Ryan J. Maierson; Patrick H. Shannon 

E-mail: nick.luongo@lw.com; ryan.maierson@lw.com; patrick.shannon@lw.com 

Section 4.9 Counterparts. This Sponsor Agreement may be executed in two or more counterparts (any of which may be delivered by
electronic transmission), each of which shall constitute an original, and all of which taken together shall constitute one and the same instrument. 

Section 4.10 Entire Agreement. This Sponsor Agreement and the agreements referenced herein constitute the entire agreement and
understanding of the parties hereto in respect of the subject matter hereof and supersede all prior understandings, agreements or representations by or among the parties hereto to the extent they relate in any way to the subject matter hereof. 

Section 4.11 Further Assurances. From time to time, at the Company’s request and without further consideration, each Sponsor
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. 

  
 16 

 Section 4.12 Mutual Release.  

(a) Effective as of the Closing, Acquiror, on behalf of itself and its Subsidiaries and its and their respective successors and assigns
(each, an “Acquiror Releasing Party”), hereby unconditionally and irrevocably forever releases and discharges each Sponsor and each of its Affiliates, and any past, present or future directors, managers, officers, employees,
Representatives, agents, lenders, investors, partners, principals, members, managers, direct or indirect shareholders or equityholders of any of the foregoing Persons, and the respective successors and assigns of the foregoing Persons (each, an
“Acquiror Released Party”), of and from, and hereby unconditionally and irrevocably waives, releases and discharges any and all proceedings, covenants, claims, liabilities, suits, judgments, accounts, actions and causes of
action of any kind or character whatsoever, known or unknown, suspected or unsuspected, in Contract, direct or indirect, primary or secondary, at Law or in equity, that such Acquiror Releasing Party ever had, now has or ever may have or claim to
have against any Acquiror Released Party, for or by reason of any matter, circumstance, event, action, inaction, omission, cause or thing arising at or prior to the Closing, or otherwise related to the
pre-Closing period; provided, that nothing contained in this Section 4.11(a) shall be construed as a waiver of any rights under (i) this Sponsor Agreement, (ii) any other
Transaction Agreement to which any Acquiror Releasing Party is party or (iii) with respect to any Acquiror Released Party who is a natural person, any indemnification, employment or other similar arrangements (including any such arrangement
providing for exculpation or advancement of expenses). Acquiror, on behalf of itself and the other Acquiror Releasing Parties, expressly waives all rights afforded by any statute which limits the effect of a release with respect to unknown claims,
and understands the significance of this release of unknown claims and waiver of statutory protection against a release, on behalf of itself and the other Acquiror Releasing Parties, of unknown claims, and acknowledges and agrees that this waiver is
an essential and material term of this Sponsor Agreement. Acquiror, on behalf of itself and each other Acquiror Releasing Party, acknowledges that each Sponsor will be relying on the waiver and release provided in this Section 4.11(a) in
connection with entering into this Sponsor Agreement and that this Section 4.11(a) is intended for the benefit of the Acquiror Released Parties and to grant third party beneficiary rights to each Acquiror Released Party to enforce this
Section 4.11(a). 
 (b) Effective as of the Closing, each Sponsor, on behalf of itself and its Subsidiaries and its and their
respective successors and assigns (each, a “Sponsor Releasing Party”), hereby unconditionally and irrevocably forever releases and discharges Acquiror and each of its Affiliates, and any past, present or future directors,
managers, officers, employees, Representatives, agents, lenders, investors, partners, principals, members, managers, direct or indirect shareholders or equityholders of any of the foregoing Persons, and the respective successors and assigns of the
foregoing Persons (each, a “Sponsor Released Party”), of and from, and hereby unconditionally and irrevocably waives, releases and discharges any and all proceedings, covenants, claims, liabilities, suits, judgments,
accounts, actions and causes of action of any kind or character whatsoever, known or unknown, suspected or unsuspected, in Contract, direct or indirect, primary or secondary, at Law or in equity, that such Sponsor Releasing Party ever had, now has
or ever may have or claim to have against any Sponsor 

  
 17 

 
Released Party, for or by reason of any matter, circumstance, event, action, inaction, omission, cause or thing arising at or prior to the Closing, or otherwise related to the pre-Closing period; provided, that nothing contained in this Section 4.11(b) shall be construed as a waiver of any rights under (i) this Sponsor Agreement, (ii) any other Transaction
Agreement to which such Sponsor or any of its associated Sponsor Releasing Parties is party, (iii) any indemnification, employment or other similar arrangements (including any such arrangement providing for exculpation or advancement of
expenses), (iv) any Affiliate Agreement set forth on Schedule II, or (v) any obligation to pay any Acquiror Expenses. Each Sponsor, on behalf of itself and each of its associated Sponsor Releasing Parties, expressly waives all rights afforded
by any statute which limits the effect of a release with respect to unknown claims, and understands the significance of this release of unknown claims and waiver of statutory protection against a release, on behalf of itself and its associated
Sponsor Releasing Parties, of unknown claims, and acknowledges and agrees that this waiver is an essential and material term of this Sponsor Agreement. Each Sponsor, on behalf of itself and each of its associated Sponsor Releasing Parties,
acknowledges that Acquiror will be relying on the waiver and release provided in this Section 4.11(b) in connection with entering into this Sponsor Agreement and that this Section 4.11(b) is intended for the benefit of the
Sponsor Released Parties and to grant third party beneficiary rights to each Sponsor Released Party to enforce this Section 4.11(b). 

Section 4.13 Disclosure. Each Sponsor 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
Sponsor’s identity and ownership of the Subject Securities, the nature of such Sponsor’s obligations under this Agreement and a copy of this Sponsor Agreement, if reasonably deemed appropriate by Acquiror and the Company. Each Sponsor 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). 
 [THE REMAINDER OF THIS PAGE IS INTENTIONALLY BLANK] 

  
 18 

 IN WITNESS WHEREOF, the Sponsors, Acquiror, and the Company have each caused this Sponsor
Support Agreement to be duly executed as of the date first written above. 
  

			
	SPONSORS:
	
	SUPERNOVA PARTNERS II LLC
		
	By:	 	/s/ Michael Clifton
		 	Name: Michael Clifton
		 	Title: Chief Financial Officer

 
	
	
	/s/ Spencer M. Rascoff
	Name: Spencer M. Rascoff

 
	
	
	/s/ Alexander M. Klabin
	Name: Alexander M. Klabin

 
	
	
	/s/ Robert D. Reid
	Name: Robert D. Reid

 
	
	
	/s/ Michael S. Clifton
	Name: Michael S. Clifton

  
 [Signature Page to
Sponsor Support Agreement] 

 
			
	ACQUIROR:
	
	SUPERNOVA PARTNERS ACQUISITION COMPANY II, LTD.
		
	By:	 	/s/ Michael Clifton
		 	Name: Michael Clifton
		 	Title: Chief Financial Officer

  
 [Signature Page to
Sponsor Support Agreement] 

 
			
	COMPANY:
	
	RIGETTI HOLDINGS, INC.
		
	By:	 	/s/ Rick Danis
		 	Name: Rick Danis
		 	Title: Secretary

  
 [Signature Page to
Sponsor Support Agreement] 

 Schedule I 

Sponsor Founder Shares and Founder Warrants 
  

									
	 Sponsor
	  	Acquiror Class B Ordinary
Shares	 	 	Acquiror Warrants	 
	 Supernova Partners II LLC
  

4301 50th Street NW, Suite 300 PMB 1044, Washington, D.C. 20016
	  	 	8,418,000	 	 	 	4,450,000	 
	 Spencer M. Rascoff
  

c/o Supernova Partners II LLC

4301 50th Street NW, Suite 300 PMB 1044, Washington, D.C. 20016
	  	 	—   	(1) 	 	 	—   	(1) 
	 Alexander M. Klabin
  

c/o Supernova Partners II LLC

4301 50th Street NW, Suite 300 PMB 1044, Washington, D.C. 20016
	  	 	—   	(1) 	 	 	—   	(1) 
	 Robert D. Reid
  

c/o Supernova Partners II LLC

4301 50th Street NW, Suite 300 PMB 1044, Washington, D.C. 20016
	  	 	—   	(1) 	 	 	—   	(1) 
	 Michael S. Clifton
  

c/o Supernova Partners II LLC

4301 50th Street NW, Suite 300 PMB 1044, Washington, D.C. 20016
	  	 	—   	(1) 	 	 	—   	(1) 

  

	(1)	 Messrs. Rascoff, Klabin, Reid and Clifton are among the members of Supernova Partners II LLC and share voting
and investment discretion with respect to the ordinary shares held of record by Supernova Partners II LLC. Each of Messrs. Rascoff, Klabin, Reid and Clifton disclaims any beneficial ownership of the securities held by Supernova Partners II LLC other
than to the extent of any pecuniary interest he may have therein, directly or indirectly. 

  
 [Schedule I to Sponsor
Support Agreement] 

 Schedule II 

Affiliate Agreements 
  

	 	1.	 Registration Rights Agreement, dated March 1, 2021, by and among Acquiror, Sponsor Holdco and certain
other security holders named therein 

  

	 	2.	 Letter Agreement, dated March 1, 2021, by and among Acquiror, its current executive officers and directors
and Sponsor Holdco, as may be amended 

  

	 	3.	 Private Placement Warrants Purchase Agreement, dated March 1, 2021, by and between Acquiror and Sponsor
Holdco 

  

	 	4.	 Promissory Note, dated December 22, 2020, by and between Acquiror and Sponsor Holdco

  

	 	5.	 Indemnity Agreements, dated March 1, 2021, by and between Acquiror and each of the following:

  

	 	a.	 Jim Lanzone 

  

	 	b.	 Rajeev Singh 

  

	 	c.	 Spencer Rascoff 

  

	 	d.	 Robert Reid 

  

	 	e.	 Katie Curnutte 

  

	 	f.	 Gregg Renfrew 

  

	 	g.	 Ken Fox 

  

	 	h.	 Damien Hooper-Campbell 

 

	 	i.	 Michael Clifton 

  

	 	j.	 Alexander Klabin 

  
 [Schedule II to Sponsor
Support Agreement]

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