Exhibit 99.4

Final Form

SUBSCRIPTION AGREEMENT

This SUBSCRIPTION AGREEMENT (this “Subscription Agreement”) is entered into this 28th day of July, 2021, by and among Spartan Acquisition Corp. III, a Delaware corporation (“Spartan”), Athena Pubco B.V., a Dutch private limited liability company (besloten vennootschap met beperkte aansprakelijkheid) (the “Issuer”), and the undersigned (“Subscriber”).

WHEREAS, each of Allego Holding B.V., a Dutch private limited liability company (besloten vennootschap met beperkte aansprakelijkheid) (the “Company”) and the Issuer are wholly-owned direct subsidiaries of Madeleine Charging B.V., a Dutch private limited liability company (besloten vennootschap met beperkte aansprakelijkheid) (“Madeleine Charging”);

WHEREAS, concurrently with the execution and delivery of this Subscription Agreement, each of Spartan, the Issuer, Athena Merger Sub, Inc., a Delaware corporation and wholly owned direct subsidiary of the Issuer (“Merger Sub”), the Company, Madeleine Charging and, solely with respect to the provisions to which it is made a party, E8 Partenaires, a French societe par actions simplifee (“E8 Investor”), are entering into that certain Business Combination Agreement, dated as of the date of this Subscription Agreement (as the same may be amended or supplemented from time to time, the “Combination Agreement”);

WHEREAS, pursuant to the Combination Agreement, (i) E8 Investor will acquire a number of shares of the Company as set forth in the Combination Agreement, (ii) Madeleine Charging and E8 Investor will contribute, in the aggregate, 100% of the issued and outstanding shares of the Company to the Issuer in exchange for a number of the Issuer’s ordinary shares, with a nominal value of EUR 1.00 (the “Ordinary Shares”), as set forth in the Combination Agreement, which shall be issued to Madeleine Charging and E8 Investor in proportion to the relative number of issued and outstanding shares of the Company contributed to the Issuer by Madeleine Charging and E8 Investor, respectively, rounded to the nearest whole Ordinary Share, (iii), each Spartan Class B Share will convert into one Spartan Class A Share (each as defined below), (iv) Merger Sub will merge with and into Spartan, with Spartan surviving the merger as a wholly owned direct subsidiary of the Issuer, on the terms and subject to the conditions set forth in the Combination Agreement, (v) the Issuer will be converted into a Dutch public limited liability company (naamloze vennootschap), and (vi) Spartan will make or cause to be paid any payments required to be made by Spartan in connection with the exercise of redemption rights (clauses (i) through (vi) collectively, the “Transactions”);

WHEREAS, in connection with the Transactions, on the terms and subject to the conditions set forth in this Subscription Agreement, Subscriber desires to subscribe for and purchase from the Issuer the number of Ordinary Shares set forth on the signature page hereto (the “Acquired Shares”) for a purchase price of $10.00 per share (the “Share Purchase Price” and the aggregate purchase price set forth on the signature page hereto for the Acquired Shares, the “Purchase Price”), and the Issuer desires to issue and sell to Subscriber the Acquired Shares in consideration of the payment of the Purchase Price by or on behalf of Subscriber to the Issuer at the Closing (as defined herein); and

WHEREAS, in connection with the Transactions, certain institutional “accredited investors” (as such term is defined in Rule 501 under the Securities Act of 1933, as amended (the “Securities Act”)) other than Subscriber (each, an “Other Subscriber”), have entered into subscription agreements with the Issuer substantially similar to this Subscription Agreement, pursuant to which such Other Subscribers have agreed to subscribe for and purchase, and the Issuer has agreed to issue and sell to such Other Subscribers, on the Closing Date, Ordinary Shares at the Share Purchase Price (the “Other Subscription Agreements”).

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:

1. Subscription. Subject to the terms and conditions hereof, Subscriber hereby agrees to subscribe for and purchase, and the Issuer hereby agrees to issue and sell to Subscriber, upon the receipt of the Purchase Price by the Issuer, the Acquired Shares (such subscription and issuance, the “Subscription”).

2. Closing.

a. Subject to the satisfaction or waiver of the conditions set forth in Sections 2(c) and 2(d), the closing of the Subscription contemplated hereby (the “Closing”) shall occur on the date of, and at a time substantially concurrently with, the closing of the Transactions (such date, the “Closing Date”). Not less than five (5) business days prior to the anticipated Closing Date (the “Expected Closing Date”), the Issuer shall provide written notice to Subscriber (the “Closing Notice”) of the Expected Closing Date specifying (i) the Expected Closing Date and (ii) the wire instructions for delivery of the Purchase Price to the Issuer. No later than two (2) business days prior to the Expected Closing Date set forth in the Closing Notice, Subscriber shall deliver to the Issuer such information as is reasonably requested in the Closing Notice in order for the Issuer to issue the Acquired Shares to Subscriber.

b. Subject to the satisfaction or waiver of the conditions set forth in Sections 2(c) and 2(d) (other than those conditions that by their nature are to be satisfied at the closing of the Transactions pursuant to the Combination Agreement, but without affecting the requirement that such conditions be satisfied or waived at the closing of the Transactions):

(i) Subscriber shall deliver to the Issuer the Purchase Price for the Acquired Shares no later than one (1) business day prior to the Closing Date (unless otherwise agreed by the Issuer) by wire transfer of U.S. dollars in immediately available funds to the account specified by the Issuer in the Closing Notice; and

(ii) The Issuer shall deliver to Subscriber (i) the Acquired Shares against and upon receipt of the Purchase Price by the Issuer in book entry form, free and clear of any liens or other restrictions whatsoever (other than those arising under state or federal securities laws), in the name of Subscriber (or its nominee in accordance with its delivery instructions) or to a custodian designated by Subscriber, as applicable and (ii) a copy of the records of, or correspondence from, the Issuer’s transfer agent reflecting Subscriber as the owner of the Acquired Shares on and as of the Closing Date. Each book entry for the Acquired Shares shall contain a legend in substantially the following form:

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THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED, OR THE SECURITIES LAWS OF ANY STATE OR OTHER JURISDICTION, AND MAY NOT BE SOLD OR TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION OR AN EXEMPTION THEREFROM.

c. The Issuer’s obligation to effect the Closing shall be subject to the satisfaction on the Closing Date, or, to the extent permitted by applicable law, the waiver by the Issuer, of each of the following conditions:

(i) all representations and warranties of Subscriber contained in this Subscription Agreement shall be true and correct in all material respects (other than representations and warranties that are qualified as to materiality or Subscriber Material Adverse Effect (as defined herein), which representations and warranties shall be true and correct in all respects) at and as of the Closing Date, and consummation of the Closing shall constitute a reaffirmation by Subscriber of each of the representations, warranties and agreements of each such party contained in this Subscription Agreement as of the Closing Date (in each case, other than those representations and warranties expressly made as of an earlier date, which shall be true and correct in all material respects as of such earlier date);

(ii) Subscriber shall have performed, satisfied and complied in all material respects with all covenants, agreements and conditions required by this Subscription Agreement to be performed, satisfied or complied with by it at or prior to the Closing;

(iii) no governmental authority shall have enacted, issued, promulgated, enforced or entered any judgment, order, law, rule or regulation (whether temporary, preliminary or permanent) which is then in effect and has the effect of making consummation of the Subscription illegal or otherwise preventing or prohibiting consummation of the Subscription, and no governmental authority shall have instituted or threatened in writing a proceeding seeking to impose any such prevention or prohibition;

(iv) all conditions precedent to the Issuer’s obligation to effect the Transactions set forth in the Combination Agreement shall have been satisfied or waived (other than those conditions that (x) may only be satisfied at the closing of the Transactions, but subject to the satisfaction or waiver of such conditions as of the closing of the Transactions, or (y) will be satisfied by the Closing and the closing of the transactions contemplated by the Other Subscription Agreements);

(v) the Issuer shall have obtained approval of the New York Stock Exchange (the “NYSE”) to list the Ordinary Shares, subject to official notice of issuance, and no suspension of the qualification of the Ordinary Shares for offering or sale or trading in any jurisdiction, or initiation or threatening of any proceedings for any of such purposes, shall have occurred; and

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(vi) no suspension of the offering or sale of the Acquired Shares shall have been initiated or, to Spartan or the Issuer’s knowledge, threatened, in any jurisdiction, including by the Securities and Exchange Commission (the “Commission”).

d. Subscriber’s obligation to effect the Closing shall be subject to the satisfaction on the Closing Date, or, to the extent permitted by applicable law, the waiver by Subscriber, of each of the following conditions:

(i) all representations and warranties of Spartan and the Issuer contained in this Subscription Agreement shall be true and correct in all material respects (other than representations and warranties that are qualified as to materiality or Material Adverse Effect or Spartan Material Adverse Effect, as applicable (each as defined herein), which representations and warranties shall be true and correct in all respects) at and as of the Closing Date, and consummation of the Closing shall constitute a reaffirmation by Spartan and the Issuer of each of the representations, warranties and agreements of each such party contained in this Subscription Agreement as of the Closing Date (other than those representations and warranties expressly made as of an earlier date, which shall be true and correct in all material respects as of such earlier date);

(ii) no governmental authority shall have enacted, issued, promulgated, enforced or entered any judgment, order, law, rule or regulation (whether temporary, preliminary or permanent) which is then in effect and has the effect of making consummation of the Subscription illegal or otherwise preventing or prohibiting consummation of the Subscription, and no governmental authority shall have instituted or threatened in writing a proceeding seeking to impose any such prevention or prohibition;

(iii) each of the Issuer and Spartan shall have performed, satisfied and complied in all material respects with all covenants, agreements and conditions required by this Subscription Agreement to be performed, satisfied or complied with by it at or prior to the Closing, except where the failure of such performance, satisfaction or compliance would not or would not be reasonably expected to prevent, materially delay, or materially impair the ability of the Issuer to consummate the Closing;

(iv) the terms of the Combination Agreement (as the same exists on the date of this Subscription Agreement), including without limitation the terms set forth in Article VIII thereof, shall not have been amended, modified or waived in a manner that could reasonably be expected to materially and adversely affect the economic benefits that Subscriber would reasonably expect to receive under this Subscription Agreement;

(v) all conditions precedent to the closing of the Transactions set forth in the Combination Agreement, shall have been satisfied or waived (other than those conditions that (x) may only be satisfied at the closing of the Transactions, but subject to the satisfaction or waiver of such conditions as of the closing of the Transactions, or (y) will be satisfied by the Closing and the closing of the transactions contemplated by the Other Subscription Agreements);

(vi) The Issuer shall have obtained approval of the NYSE to list the Ordinary Shares, subject to official notice of issuance, and no suspension of the qualification of the Ordinary Shares for offering or sale or trading in any jurisdiction, or initiation or threatening of any proceedings for any of such purposes, shall have occurred; and

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(vii) there shall have been no amendment, waiver or modification to any Other Subscription Agreements that materially benefits any Other Subscribers unless Subscriber has been offered substantially similar benefits in writing.

e. Prior to or at the Closing, Subscriber shall execute and deliver such additional documents and take such additional actions as the Issuer reasonably may deem to be practical and necessary in order to consummate the Subscription as contemplated by this Subscription Agreement.

f. In the event that the closing of the Transactions does not occur within five (5) business days of the Expected Closing Date, the Issuer shall promptly (but not later than three (3) business days thereafter) return the Purchase Price to Subscriber in immediately available funds to the account specified by Subscriber, and any book entries shall be deemed cancelled. Notwithstanding such return or cancellation, unless and until this Subscription Agreement is terminated in accordance with Section 8 herein, Subscriber shall remain obligated (A) to redeliver funds to the Issuer in escrow following the Issuer’s delivery to Subscriber of a new Closing Notice and (B) to consummate the Closing immediately prior to or substantially concurrently with the consummation of the Transactions.

3. Issuer Representations and Warranties. The Issuer represents and warrants that:

a. The Issuer has been incorporated as a Dutch private limited liability company (besloten vennootschap met beperkte aansprakelijkheid) and is, following conversion of its legal form, validly existing as a Dutch public company (naamloze vennootschap) in good standing (or such equivalent concept to the extent it exists under the laws of the Netherlands) under the laws of the Netherlands, with corporate power and authority to own, lease and operate its properties and conduct its business as presently conducted and as the Issuer currently contemplates shall be conducted following the Transactions and to enter into, deliver and perform its obligations under this Subscription Agreement.

b. The Acquired Shares have been duly authorized and, when issued and delivered to Subscriber against full payment for the Acquired Shares in accordance with the terms of this Subscription Agreement and registered in the Issuer’s shareholders’ register, the Acquired Shares will be validly issued, fully paid and non-assessable (meaning that the holders of the Acquired Shares will not by reason of merely being such a holder, be subject to assessment or calls by the Company or its creditors for further payment on such Acquired Shares), free and clear of any liens or other restrictions whatsoever (other than those arising under state or federal securities laws), and will not have been issued in violation of or subject to any preemptive or similar rights created under the Issuer’s articles of association, under the laws of the Netherlands, or pursuant to any other understanding, right, agreement or otherwise.

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c. This Subscription Agreement, the Other Subscription Agreements and the Combination Agreement (collectively, the “Transaction Documents”) have been duly authorized, executed and delivered by the Issuer and are enforceable against the Issuer in accordance with their respective 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.

d. Assuming the accuracy of Subscriber’s representations and warranties in Section 5, the execution and delivery by the Issuer of the Transaction Documents, and the performance by the Issuer of its obligations under the Transaction Documents, including the issuance and sale of the Acquired Shares and the consummation of the other transactions contemplated herein, do not and will not 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 pursuant to the terms of (i) any indenture, mortgage, deed of trust, loan agreement, lease, license or other agreement or instrument to which the Issuer is a party or by which the Issuer is bound or to which any of the property or assets of the Issuer is subject, which would be reasonably expected to have, individually or in the aggregate, a material adverse effect on the business, properties, financial condition, shareholders’ equity or results of operations of the Issuer (a “Material Adverse Effect”) or materially affect the validity of the Acquired Shares or the legal authority of the Issuer to comply in all material respects with the terms of this Subscription Agreement; (ii) the articles of association of the Issuer; or (iii) any statute or any judgment, order, rule or regulation of any court or governmental agency or body, domestic or foreign, having jurisdiction over the Issuer or any of its properties that would be reasonably expected to have, individually or in the aggregate, a Material Adverse Effect or materially affect the validity of the Acquired Shares or the legal authority of the Issuer to comply in all material respects with this Subscription Agreement.

e. 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 Acquired Shares or (ii) the Ordinary Shares to be issued pursuant to any Other Subscription Agreement, in each case, that have not been or will not be validly waived on or prior to the Closing Date.

f. The Issuer is not in default or violation (and no event has occurred which, with notice or the lapse of time or both, would constitute a default or violation) of any term, condition or provision of (i) the articles of association of the Issuer, (ii) any loan or credit agreement, note, bond, mortgage, indenture, lease or other agreement, permit, franchise or license to which the Issuer is now a party or by which the Issuer’s properties or assets are bound, or (iii) any statute or any judgment, order, rule or regulation of any court or governmental agency or body, domestic or foreign, having jurisdiction over the Issuer or any of its properties, except, in the case of clauses (ii) and (iii), for defaults or violations that have not had and would not be reasonably expected to have, individually or in the aggregate, a Material Adverse Effect.

g. Assuming the accuracy of Subscriber’s representations and warranties in Section 5, the Issuer is not required to obtain any consent, waiver, authorization or order of, give any notice to, or make any filing or registration with, any court or other federal, state, local or other governmental authority, self-regulatory organization or other person in connection with the execution, delivery and performance by the Issuer of this Subscription Agreement (including, without limitation, the issuance of the Acquired Shares), other than (i) the filing with the

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Commission of the Registration Statement (as defined below), (ii) filings required by applicable state or federal securities laws, (iii) those required by the NYSE, and (iv) the failure of which to obtain would not be reasonably expected to have, individually or in the aggregate, a Material Adverse Effect or have a material adverse effect on the Issuer’s ability to consummate the transactions contemplated hereby, including the sale and issuance of the Acquired Shares.

h. As of the date hereof, one (1) Ordinary Share is issued and outstanding. There are no securities or instruments issued by or to which Issuer is a party containing anti-dilution or similar provisions that will be triggered by the issuance of (i) the Acquired Shares or (ii) the Ordinary Shares to be issued pursuant to any Other Subscription Agreement, in each case, that have not been or will not be validly waived on or prior to the Closing Date. 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 Combination Agreement.

i. The Issuer is in compliance with all applicable laws, except where such noncompliance would not reasonably be expected to have, individually or in the aggregate, a Material Adverse Effect. The Issuer has not received any written communication from a governmental entity 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 a Material Adverse Effect.

j. Assuming the accuracy of Subscriber’s representations and warranties set forth in Section 5, no registration under the Securities Act is required for the offer and sale of the Acquired Shares by the Issuer to Subscriber in the manner contemplated by this Subscription Agreement.

k. Neither the Issuer nor any person acting on its behalf has engaged or will engage in any form of general solicitation or general advertising (within the meaning of Regulation D of the Securities Act) in connection with any offer or sale of the Acquired Shares.

l. The Issuer has not entered into any side letter or similar agreement with any Other Subscriber or any other investor in connection with such Other Subscriber’s or such other investor’s direct or indirect investment in the Issuer other than (i) the Combination Agreement, (ii) the Other Subscription Agreements; provided, that no Other Subscription Agreement included a purchase price per share that is lower than the Share Purchase Price or includes terms and conditions that are materially more advantageous to any such Other Subscriber, investor or potential investor (as compared to Subscriber), other than terms particular to the regulatory requirements of such Subscriber or its affiliates or related funds, (iii) that certain letter agreement, dated February 8, 2021 by and among the Sponsor, Spartan and the other parties thereto, as amended on the date hereof, (iv) agreements or forms thereof that have been publicly filed via the Commission’s EDGAR system, including filings made by either Spartan or the Issuer and (v) commercial arrangements between operating subsidiaries of the Company or the Company and any strategic Other Subscriber or its affiliates. The Other Subscription Agreements have not been amended in any material respect following the date of this Subscription Agreement and reflect the same Share Purchase Price and economic terms that are no more favorable to any such Other Subscriber thereunder than the terms of this Subscription Agreement (other than (A) the alternative settlement mechanics available to investment companies registered under the Investment Company Act or investors advised by an investment adviser subject to regulation under the Investment Advisers Act as contemplated by Section 2(b) hereof or (B) commercial arrangements between operating subsidiaries of the Company or the Company and any strategic Other Subscriber or its affiliates).

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m. Except for such matters as have not had and would not be reasonably expected to have, individually or in the aggregate, a Material Adverse Effect, there is no (i) suit, action, proceeding or arbitration before a governmental authority or arbitrator pending, or, to the knowledge of the Issuer, threatened against the Issuer or (ii) judgment, decree, injunction, ruling or order of any governmental entity or arbitrator outstanding against the Issuer.

n. Except for placement fees payable to Barclays Capital Inc. (“Barclays”), Citigroup Global Markets, Inc. (“Citi”), Credit Suisse Securities (USA) LLC (“Credit Suisse”), Goldman Sachs International (“Goldman Sachs”), and Apollo Global Securities, LLC (“AGS”), in their capacity as placement agents for the offer and sale of the Acquired Shares (in such capacity, the “Placement Agents”), the Issuer has not paid, and is not obligated to pay, any brokerage, finder’s or other commission or similar fee in connection with its issuance and sale of the Acquired Shares, including, for the avoidance of doubt, any fee or commission payable to any stockholder or affiliate of the Issuer; provided, however, that Barclays, Credit Suisse and Citi will separately receive deferred underwriting commissions, as disclosed in Spartan’s final prospectus relating to its initial public offering dated February 8, 2021, upon the closing of the Transactions; provided, further, that Credit Suisse may separately receive fees from the Company in its capacity as financial advisor and capital markets advisor to the Company.

o. None of the Issuer, its subsidiaries or any of their affiliates, nor any person acting on their behalf has, directly or indirectly, made any offers or sales of any security or solicited any offers to buy any security, under circumstances that would require registration of the issuance of any of the Acquired Shares under the Securities Act, whether through integration with prior offerings pursuant to Rule 502(a) of the Securities Act or otherwise.

4. Spartan Representations and Warranties. Spartan represents and warrants that:

a. Spartan has been duly incorporated and is validly existing as a corporation in good standing under the laws of the State of Delaware, 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.

b. The Transaction Documents have been duly authorized, executed and delivered by Spartan and are enforceable against Spartan in accordance with their respective 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.

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c. The execution and delivery by Spartan of the Transaction Documents, and the performance by Spartan of its obligations under the Transaction Documents do not and will not 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 Spartan pursuant to the terms of (i) any indenture, mortgage, deed of trust, loan agreement, lease, license or other agreement or instrument to which Spartan is a party or by which Spartan is bound or to which any of the property or assets of Spartan is subject, which would be reasonably expected to have, individually or in the aggregate, a material adverse effect on the business, properties, financial condition, shareholders’ equity or results of operations of Spartan (a “Spartan Material Adverse Effect”) or materially affect the legal authority of Spartan to comply in all material respects with the terms of this Subscription Agreement; (ii) the organizational documents of Spartan; or (iii) any statute or any judgment, order, rule or regulation of any court or governmental agency or body, domestic or foreign, having jurisdiction over Spartan or any of its properties that would be reasonably expected to have, individually or in the aggregate, a Spartan Material Adverse Effect or materially affect the legal authority of the Issuer to comply in all material respects with this Subscription Agreement.

d. The authorized capital stock of Spartan consists of (i) 1,000,000 shares of preferred stock, par value $0.0001 per share (“Spartan Preferred Stock”), (ii) 250,000,000 shares of Class A common stock, par value $0.0001 per share (“Spartan Class A Shares”), and (iii) 20,000,000 shares of Class B common stock, par value $0.0001 per share (“Spartan Class B Shares”). As of the date hereof and as of immediately prior to the Closing: (1) no shares of Spartan Preferred Stock are issued and outstanding, (2) 55,200,000 Spartan Class A Shares are issued and outstanding, (3) 13,800,000 Spartan Class B Shares are issued and outstanding, and (3) 23,160,000 warrants, each entitling the holder thereof to purchase one Spartan Class A Share at an exercise price of $11.50 per Class A Share, are outstanding.

e. There are no securities or instruments issued by or to which Spartan is a party containing anti-dilution or similar provisions that will be triggered by the issuance of (i) the Acquired Shares or (ii) the Ordinary Shares to be issued pursuant to any Other Subscription Agreement, in each case, that have not been or will not be validly waived on or prior to the Closing Date. There are no stockholder agreements, voting trusts or other agreements or understandings to which Spartan is a party or by which it is bound relating to the voting of any securities of Spartan, other than (1) as set forth in the SEC Documents and (2) as contemplated by the Combination Agreement.

f. Spartan is not required to obtain any consent, waiver, authorization or order of, give any notice to, or make any filing or registration with, any court or other federal, state, local or other governmental authority, self-regulatory organization or other person in connection with the execution, delivery and performance by Spartan of this Subscription Agreement, other than the filing required by Section 11(m).

g. Spartan is in compliance with all applicable laws, except where such noncompliance would not reasonably be expected to have, individually or in the aggregate, a Spartan Material Adverse Effect. Spartan has not received any written communication, from a governmental entity 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 a Spartan Material Adverse Effect.

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h. Neither Spartan nor any person acting on its behalf has engaged or will engage in any form of general solicitation or general advertising (within the meaning of Regulation D of the Securities Act) in connection with any offer or sale of the Acquired Shares.

i. A copy of each form, report, statement, schedule, prospectus, proxy, registration statement and other document, if any, filed by Spartan with the Commission since its initial registration of the Spartan Class A Shares and warrants (the “SEC Documents”) is available to the undersigned via the Commission’s EDGAR system. The SEC Documents, as of their respective filing dates, complied in all material respects with the applicable requirements of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) and the applicable rules and regulations of the Commission promulgated thereunder. None of the SEC Documents filed under the Exchange Act (except to the extent that information contained in any SEC Document has been superseded by a later timely filed SEC Document) contained, when filed, 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 not misleading, in the case of any SEC Document that is a registration statement, or included, when filed, any untrue statement of a material fact or omitted to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading, in the case of all other SEC Documents; provided, that Spartan makes no such representation or warranty with respect to the registration statement on Form F-4 filed or to be filed by the Issuer, or the proxy statement/prospectus related thereto to be filed by the Issuer, with respect to the Business Combination or any other information relating to Madeleine Charging or any of their respective affiliates included in any SEC Document or filed as an exhibit thereto; provided further, that Spartan makes no such representation or warranty with respect to the accounting treatment of its warrants or other changes in accounting arising in connection with any required restatement of Spartan’s historical financial statements, or as to any deficiencies in disclosure (including with respect to financial statement presentation or accounting and disclosure controls) arising from the treatment of such warrants as equity rather than liabilities or other required changes in Spartan’s financial statements and SEC Documents, or any related disclosure, in the SEC Documents. Spartan has timely filed each report, statement, schedule, prospectus, and registration statement that Spartan was required to file with the Commission since its inception. There are no material outstanding or unresolved comments in comment letters from the Staff of the Commission with respect to any of the SEC Documents.

j. Except for placement fees payable to the Placement Agents in their capacity as Placement Agents, Spartan has not paid, and is not obligated to pay, any brokerage, finder’s or other commission or similar fee in connection with the issuance and sale of the Acquired Shares, including, for the avoidance of doubt, any fee or commission payable to any stockholder or affiliate of the Issuer; provided, however, that Barclays, Credit Suisse and Citi will separately receive deferred underwriting commissions, as disclosed in Spartan’s final prospectus relating to its initial public offering dated February 8, 2021, upon the closing of the Transactions; provided, further, that Credit Suisse may separately receive fees from the Company in its capacity as financial advisor and capital markets advisor to the Company.

k. Immediately following the Closing, Spartan will be a wholly-owned subsidiary of the Issuer and there will be no outstanding options, warrants or other rights to subscribe for, purchase or acquire from Spartan any equity interests in Spartan, or securities convertible into or exchangeable or exercisable for such equity interests.

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5. Subscriber Representations and Warranties. Subscriber represents and warrants that:

a. 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 the requisite entity power and authority to enter into, deliver and perform its obligations under this Subscription Agreement.

b. This Subscription Agreement has been duly authorized, executed and delivered by Subscriber. This Subscription Agreement 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.

c. The execution, delivery and performance by Subscriber of this Subscription Agreement, including the consummation of the transactions contemplated hereby, (i) are fully consistent with Subscriber’s financial needs, objectives and condition, (ii) comply and are fully consistent with all investment policies, guidelines and other restrictions applicable to Subscriber, (iii) have been duly authorized and approved by all necessary action and (iv) are a fit, proper and suitable investment for Subscriber, notwithstanding the substantial risks inherent in investing in or holding the Acquired Shares.

d. The execution and delivery by Subscriber of this Subscription Agreement, and the performance by Subscriber of its obligations under this Subscription Agreement, including the purchase of the Acquired Shares and the consummation of the other transactions contemplated herein, will not 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 pursuant to the terms of (i) any indenture, mortgage, deed of trust, loan agreement, lease, license or other agreement or instrument to which Subscriber is a party or by which Subscriber is bound or to which any of the property or assets of Subscriber is subject, which would be reasonably expected to have a material adverse effect on the business, properties, financial condition, stockholders’ equity or results of operations of Subscriber, taken as a whole (a “Subscriber Material Adverse Effect”), or materially affect the legal authority of Subscriber to comply in all material respects with the terms of this Subscription Agreement; (ii) the organizational documents of Subscriber; or (iii) any statute or any judgment, order, rule or regulation of any court or governmental agency or body, domestic or foreign, having jurisdiction over Subscriber or any of Subscriber’s properties that would be reasonably expected to have a Subscriber Material Adverse Effect or materially affect the legal authority of Subscriber to comply in all material respects with this Subscription Agreement.

e. Subscriber (i) is a “qualified institutional buyer” (as defined in Rule 144A promulgated under the Securities Act) or an institutional “accredited investor” (within the meaning of Rule 501(a)(1), (2), (3), (5), (6), (7), (10), (11) or (12) under the Securities Act), in each case, satisfying the applicable requirements set forth on Schedule A, (ii) is acquiring the Acquired Shares only for its own account and not for the account of others, or if Subscriber is subscribing for the Acquired Shares as a fiduciary or agent for one or more investor accounts, each owner of such account is a “qualified institutional buyer” (as defined above) and Subscriber has full

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investment discretion with respect to each such account, and the full power and authority to make the acknowledgements, representations and agreements herein on behalf of each owner of each such account, and (iii) is not acquiring the Acquired Shares with a view to, or for offer or sale in connection with, any distribution thereof in violation of the Securities Act or any other securities laws of the United States or any other jurisdiction. Subscriber has completed Schedule A following the signature page hereto and the information contained therein is accurate and complete. Subscriber is not an entity formed for the specific purpose of acquiring the Acquired Shares, unless Subscriber is a newly formed entity in which all of the equity owners are accredited investors and is an “institutional account” as defined by FINRA Rule 4512(c).

f. Subscriber understands that the Acquired Shares are being offered in a transaction not involving any public offering within the meaning of the Securities Act and that the Acquired Shares have not been registered under the Securities Act or any other securities laws of the United States or any other jurisdiction. Subscriber understands that the Acquired 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 outside the United States within the meaning of Regulation S under the Securities Act, (iii) pursuant to Rule 144 promulgated under the Securities Act, absent a change in law, receipt of regulatory no-action relief or an exemption, provided that all of the applicable conditions thereof have been met, or (iv) pursuant to another applicable exemption from the registration requirements of the Securities Act (including without limitation sales conducted pursuant to Rule 144 promulgated under the Securities Act), and that any certificates or book entry records representing the Acquired Shares shall contain a legend to such effect. Subscriber acknowledges that the Acquired Shares will not immediately be eligible for resale pursuant to Rule 144 promulgated under the Securities Act. Subscriber understands and agrees that the Acquired Shares will be subject to transfer restrictions and, as a result of these transfer restrictions, Subscriber may not be able to readily resell the Acquired Shares and may be required to bear the financial risk of an investment in the Acquired 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 Acquired Shares. For purposes of this Subscription Agreement, “Transfer” shall mean any direct or indirect transfer, redemption, disposition or monetization in any manner whatsoever, including, without limitation, through any derivative transactions.

g. Subscriber understands and agrees that Subscriber is purchasing the Acquired Shares directly from the Issuer. Subscriber further acknowledges that there have been no representations, warranties, covenants and agreements made to Subscriber by Spartan, the Issuer, the Placement Agents or any of their officers or directors, expressly or by implication, other than those representations, warranties, covenants and agreements of the Issuer included in this Subscription Agreement.

h. Subscriber’s acquisition and holding of the Acquired 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.

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i. In making its decision to subscribe for and purchase the Acquired Shares, Subscriber represents that it has relied solely upon its own independent investigation. Without limiting the generality of the foregoing, Subscriber acknowledges and agrees Subscriber has not relied on any statements or other information provided by the Placement Agents or any of their respective affiliates, or any of their respective officers, directors, employees or representatives, concerning Spartan, the Issuer, the Company or the Acquired Shares or the offer and sale of the Acquired Shares. Subscriber acknowledges and agrees that Subscriber has received such information as Subscriber deems necessary in order to make an investment decision with respect to the Acquired Shares, including with respect to Spartan, the Issuer, the Company and the Transactions. 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 Acquired Shares.

j. Subscriber became aware of this offering of the Acquired Shares solely by means of direct contact between Subscriber and Spartan, the Issuer or the Placement Agents, and the Acquired Shares were offered to Subscriber solely by direct contact between Subscriber and Spartan, the Issuer or the Placement Agents. Subscriber did not become aware of this offering of the Acquired Shares, nor were the Acquired Shares offered to Subscriber, by any other means. Subscriber acknowledges that the Issuer represents and warrants that the Acquired Shares (i) were not offered by any form of general solicitation or general advertising 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.

k. Subscriber acknowledges that it is aware that there are substantial risks incident to the purchase and ownership of the Acquired Shares. Subscriber qualifies as a sophisticated institutional investor and has such knowledge and experience in financial and business matters as to be capable of evaluating the merits and risks of an investment, both in general and with regard to transactions in, and investment strategies involving, securities, including Subscriber’s investment in the Acquired Shares, and Subscriber has sought such accounting, legal and tax advice as Subscriber has considered necessary to make an informed investment decision. Accordingly, Subscriber acknowledges that the offering of the Acquired Shares meets the institutional account exemptions from filing under FINRA Rule 2111(b).

l. Subscriber acknowledges and agrees that (a) Barclays, Citi, Goldman Sachs and AGS are acting solely as placement agents in connection with the Subscription and are not acting as underwriters or in any other capacity and are not and shall not be construed as a fiduciary for Subscriber, the Issuer, Spartan, the Company or any other person or entity in connection with the Subscription, (b) Credit Suisse is acting as a placement agent in connection with the Subscription and as a financial advisor and capital markets advisor to the Company. Credit Suisse is not acting as an underwriter or in any other capacity and is not and shall not be construed as a fiduciary for Subscriber, the Issuer, Spartan, the Company or any other person or entity in connection with the Subscription; provided, however, that Credit Suisse is acting as a financial advisor and capital markets advisor to the Company, (c) neither the Placement Agents nor any affiliate of any of the Placement Agents (nor any officer, director, employee or representative of any of the Placement Agents or any affiliate thereof) have made, or will make, any representation or warranty, whether express or implied, of any kind or character and have not provided, and will not provide, any advice

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or recommendation in connection with the Subscription, (d) the Placement Agents will have no responsibility with respect to (i) any representations, warranties or agreements made by any person or entity under or in connection with the Subscription or any of the documents furnished pursuant thereto or in connection therewith, or the execution, legality, validity or enforceability (with respect to any person) thereof, or (ii) the business, affairs, financial condition, operations, properties or prospects of, or any other matter concerning Spartan, the Issuer or the Subscription, (e) the Placement Agents shall have no liability or obligation (including without limitation, for or with respect to any losses, claims, damages, obligations, penalties, judgments, awards, liabilities, costs, expenses or disbursements incurred by Subscriber, Spartan, the Company, the Issuer or any other person or entity), whether in contract, tort or otherwise, to Subscriber, or to any person claiming through Subscriber, in respect of the Subscription, (f) the Placement Agents and their affiliates have not made an independent investigation with respect to Spartan, the Issuer, the Company or the Acquired Shares or the accuracy, completeness or adequacy of any information supplied to Subscriber by Spartan or the Issuer, and (g) the Placement Agents have not prepared a disclosure or offering document in connection with the offer and sale of the Acquired Shares.

m. Alone, or together with any professional advisor(s), Subscriber represents and acknowledges that Subscriber has adequately analyzed and fully considered the risks of an investment in the Acquired Shares and determined that the Acquired 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.

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

o. Subscriber is not (i) a person or entity named on the List of Specially Designated Nationals and Blocked Persons, the Executive Order 13599 List, the Foreign Sanctions Evaders List, or the Sectoral Sanctions Identification List, each of which is administered by the U.S. Treasury Department’s Office of Foreign Assets Control (“OFAC”) (collectively “OFAC Lists”), (ii) owned or controlled by, or acting on behalf of, a person, that is named on an OFAC List, (iii) organized, incorporated, established, located, resident or born in, or a citizen, national, or the government, including any political subdivision, agency, or instrumentality thereof, of, Cuba, Iran, North Korea, Sudan, Syria, the Crimea region of Ukraine, or any other country or territory embargoed or subject to substantial trade restrictions by the United States, (iv) a Designated National as defined in the Cuban Assets Control Regulations, 31 C.F.R. Part 515 or (v) a non-U.S. shell bank or providing banking services indirectly to a non-U.S. shell bank. Subscriber represents that if it is a financial institution subject to the Bank Secrecy Act (31 U.S.C. section 5311 et seq.) (the “BSA”), as amended by the USA PATRIOT Act of 2001 (the “PATRIOT Act”), and its implementing regulations (collectively, the “BSA/PATRIOT Act”), that Subscriber maintains policies and procedures reasonably designed to comply with applicable obligations under the BSA/PATRIOT Act. Subscriber also represents that, to the extent required, it maintains policies and procedures reasonably designed to ensure compliance with OFAC-administered sanctions programs, including for the screening of its investors against the OFAC Lists. Subscriber further represents and warrants that, to the extent required, it maintains policies and procedures reasonably designed to ensure that the funds held by Subscriber and used to purchase the Acquired Shares were legally derived.

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p. If Subscriber is or is acting on behalf of (i) an employee benefit plan that is subject to Title I of ERISA, (ii) a plan, an individual retirement account or other arrangement that is subject to section 4975 of the Code, (iii) an entity whose underlying assets are considered to include “plan assets” of any such plan, account or arrangement described in clauses (i) and (ii) (each, an “ERISA Plan”), or (iv) 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 clauses (i), (ii) or (iii) 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 (collectively, “Similar Laws,” and together with the ERISA Plans, the “Plans”), then Subscriber represents and warrants that (1) neither the Issuer nor Spartan, nor any of their respective affiliates (the “Transaction Parties”) has provided investment advice or has otherwise acted as the Plan’s fiduciary with respect to its decision to acquire and hold the Acquired Shares, and none of the Transaction Parties is or shall at any time be the Plan’s fiduciary with respect to any decision to acquire and hold the Acquired Shares, and none of the Transaction Parties is or shall at any time be the Plan’s fiduciary with respect to any decision in connection with Subscriber’s investment in the Acquired Shares, and (2) its purchase of the Acquired Shares will not result in a non-exempt prohibited transaction under section 406 of ERISA or section 4975 of the Code, or any applicable Similar Law.

q. Subscriber will have sufficient funds to pay the Purchase Price pursuant to Section 2(b)(i).

r. If Subscriber is located in the United Kingdom or a member state of the European Economic Area, it represents and warrants that it is a qualified investor (within the meaning of Regulation (EU) 2017/1129).

s. If the Subscriber is located in Australia, the Subscriber represents and warrants that it is a person who falls within an exempt offer category in section 708 of the Corporations Act (including “sophisticated investors” or “professional investors” within the meaning of section 708(8) and 708(11) respectively of the Corporations Act).

t. If Subscriber is located in the United Kingdom, Subscriber represents and warrants that it is a person of a kind described in articles 19(5) or 49(2) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005 (SI 2005/1529) (as amended) or is otherwise a person to whom an invitation or inducement to engage in investment activity may be communicated without contravening section 21 of the Financial Services and Markets Act 2000.

u. If Subscriber is located in Oman, it represents and warrants that it is a sophisticated investor (as described in Article 139 of the Executive Regulations of the Capital Market Law).

v. No disclosure or offering document has been prepared by the Placement Agents in connection with the offer and sale of the Acquired Shares.

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w. None of the Placement Agents nor any of their respective members, directors, officers, employees, representatives and controlling persons have made any independent investigation with respect to Spartan, the Issuer, the Company or the Acquired Shares or the accuracy, completeness or adequacy of any information supplied to Subscriber by Spartan, the Company or the Issuer.

x. In connection with the issue and purchase of the Acquired Shares, no Placement Agent has acted as Subscriber’s financial advisor or fiduciary.

y. Subscriber has not entered into a binding commitment to sell or otherwise transfer the Acquired Shares.

6. Additional Subscriber Agreement. Subscriber hereby agrees that, from the date of this Subscription Agreement until the Closing Date, neither Subscriber nor any person or entity acting on behalf of Subscriber or pursuant to any understanding with Subscriber will engage in any Short Sales with respect to securities of Spartan. For purposes of this Section 6, “Short Sales” shall include, without limitation, all “short sales” as defined in Rule 200 promulgated under Regulation SHO under the Exchange Act, and all types of direct and indirect stock pledges (other than pledges in the ordinary course of business as part of prime brokerage arrangements), forward sale contracts, options, puts, calls, swaps and similar arrangements (including on a total return basis), and sales and other transactions through non-U.S. broker dealers or foreign regulated brokers. Notwithstanding the foregoing, (a) nothing herein shall prohibit other entities under common management with Subscriber that have no knowledge of this Subscription Agreement or of Subscriber’s participation in the Transactions (including Subscriber’s controlled affiliates and/or affiliates) from entering into any Short Sales and (b) in the case of a Subscriber that is a multi-managed investment vehicle whereby separate portfolio managers manage separate portions of such Subscriber’s assets and the portfolio managers have no knowledge of the investment decisions made by the portfolio managers managing other portions of such Subscriber’s assets, this Section 6 shall only apply with respect to the portion of assets managed by the portfolio manager that made the investment decision to purchase the Acquired Shares covered by this Subscription Agreement.

7. Registration Rights.

a. The Issuer agrees that, within thirty (30) calendar days after the Closing Date, the Issuer will file with the Commission (at the Issuer’s sole cost and expense) a registration statement registering the resale of the Acquired Shares (the “Registration Statement”), and the Issuer shall use its commercially reasonable efforts to have the Registration Statement declared effective as soon as practicable after the filing thereof, but no later than the earlier of (i) the 75th calendar day (or 135th calendar day if the Commission notifies the Issuer that it will “review” the Registration Statement) following the Closing 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 “Effective Date”); provided, however, that the Issuer’s obligations to include the Acquired Shares in the Registration Statement are contingent upon Subscriber furnishing in writing to the Issuer such information regarding Subscriber, the securities of the Issuer held by Subscriber and the intended method of disposition of the Acquired Shares as shall be reasonably requested by the Issuer at least five (5) business days prior to the filing thereof to effect the registration of the Acquired Shares, and Subscriber shall execute such documents in connection with such registration as the Issuer may reasonably

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request that are customary of a selling stockholder in similar situations, including providing that the Issuer shall be entitled to postpone and suspend the effectiveness or use of the Registration Statement as permitted hereunder; provided that the Subscriber shall not be required to execute any lock-up or similar agreement in connection with the filing of the Registration Statement. 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 of the Securities Act for the resale of the Acquired Shares by the applicable stockholders or otherwise, such Registration Statement shall register for resale such number of Acquired Shares which is equal to the maximum number of Acquired Shares as is permitted by the Commission. In such event, the number of Acquired Shares to be registered for each selling stockholder named in the Registration Statement shall be reduced pro rata among all such selling stockholders. Upon notification by the Commission that the Registration Statement has been declared effective by the Commission, within two (2) business days thereafter, the Issuer shall file the final prospectus under Rule 424 of the Securities Act. In no event shall Subscriber be identified as a statutory underwriter in the Registration Statement unless requested by the Commission. For purposes of clarification, any failure by the Issuer to file the Registration Statement by the deadline set forth in this Section 7 shall not otherwise relieve the Issuer of its obligations to file or effect the Registration Statement as set forth above in this Section 7. The Issuer will provide a draft of the Registration Statement to the Subscriber for review at least three (3) business days in advance of filing the Registration Statement. For purposes of this Section 7, “Acquired Shares” shall be deemed to include the Ordinary Shares acquired pursuant to this Subscription Agreement and any other equity security issued or issuable with respect to the Ordinary Shares by way of share split, dividend, distribution, recapitalization, merger, exchange, replacement or similar event or otherwise.

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

(i) 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, until the earlier of the following: (1) Subscriber ceases to hold any Acquired Shares or (2) the date all Acquired Shares held by Subscriber may be sold without restriction under Rule 144, including without limitation, any volume and manner of sale restrictions which may be applicable to affiliates under Rule 144 promulgated under the Securities Act and without the requirement for the Issuer to be in compliance with the current public information required under Rule 144(c)(1) or Rule 144(i)(2), as applicable, and (3) two years from the Effective Date of the Registration Statement.

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(ii) advise Subscriber within two (2) business days:

(1) when a Registration Statement or any amendment thereto has been filed with the Commission and when such Registration Statement or any post-effective amendment thereto has become effective;

(2) of any request by the Commission for amendments or supplements to the Registration Statement or the prospectus included therein or for additional information;

(3) of the issuance by the Commission of any stop order suspending the effectiveness of the Registration Statement or the initiation of any proceedings for such purpose;

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

(5) subject to the provisions in this Subscription Agreement, of the occurrence of any event that requires the making of any changes in the Registration Statement or prospectus so that, as of such date, the statements therein are not misleading 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 herein, 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 (1) through (5) above constitutes material, nonpublic information regarding the Issuer;

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

(iv) upon the occurrence of any event contemplated above, 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 Acquired Shares 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;

(v) use its commercially reasonable efforts to cause all Acquired Shares to be listed on each securities exchange or market, if any, on which the Ordinary Shares issued by the Issuer have been listed;

(vi) use its commercially reasonable efforts to take all other steps necessary to effect the registration of the Acquired Shares contemplated hereby and to enable Subscriber to sell the Acquired Shares under Rule 144; and

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(vii) remove the legend described in in Section 2(b)(ii) (or instruct its transfer agent to so remove such legend) from the Acquired Shares if (1) the Registration Statement is and continues to be effective under the Securities Act, (2) such Acquired Shares are sold or transferred pursuant to Rule 144 (if the transferor is not an Affiliate of the Issuer and subject to all applicable requirements of Rule 144 being met), or (3) such Acquired Shares are eligible for sale under Rule 144, without the requirement for the Issuer to be in compliance with the current public information required under Rule 144(c)(1) (or Rule 144(i)(2), if applicable) as to such securities and without volume or manner-of-sale restrictions. Each applicable holder agrees to provide the Issuer, its counsel and/or the transfer agent with evidence reasonably requested by it in order to cause the removal of the legend described in Section 2(b)(ii) (the “Representations”). Any fees (with respect to the transfer agent, Issuer counsel or otherwise) associated with the issuance of any legal opinion required by the Issuer’s transfer agent or the removal of such legend shall be borne by the Issuer. If a legend is no longer required pursuant to the foregoing, the Issuer will no later than two (2) Business Days following the delivery by an applicable holder to the Issuer or the transfer agent (with notice to the Issuer) of a legended certificate or instrument representing Acquired Shares (endorsed or with stock powers attached, signatures guaranteed, and otherwise in form necessary to affect the reissuance and/or transfer) and the Representations, deliver or cause to be delivered to such applicable holder a certificate or instrument (as the case may be) representing such Acquired Shares that is free from all restrictive legends. Certificates for Acquired Shares free from all restrictive legends may be transmitted by the transfer agent to the applicable holders by crediting the account of the applicable holder’s prime broker with DTC as directed by such applicable holder; and

(viii) until the date the Acquired Shares may be sold under Rule 144, in order to permit Subscribers to conduct sales (including continuous offerings based on market prices and block trades) of the Acquired Shares offered pursuant to the Registration Statement (“Brokerage Trades”) through two or more investment banks or other broker-dealers (“Financial Counterparties”): (a) enter into an equity distribution agreement or sales agreement with the Financial Counterparties, in customary form, which shall include, among other provisions, indemnities similar to those in Section 7(e), and representations, covenants and other indemnities and rights and obligations as are customary in equity distribution agreements for issuer ATM programs (including an obligation of the Issuer to reimburse the Financial Counterparties for the expense of one counsel to the Financial Counterparties), (b) notify Subscribers of the identities of the Financial Counterparties, (c) to the extent requested by a Financial Counterparty in order to engage in Brokerage Trades, the Issuer shall allow the Financial Counterparties to conduct customary “underwriter’s due diligence” with respect to the Issuer, which may be on a periodic “bring down” basis when the Issuer files periodic or current reports or there is material news about the Issuer, including (1) by using commercially reasonable efforts to cause its independent certified public accountants to provide to the Financial Counterparties a “cold comfort” letter in form and substance as is customarily given by independent certified public accountants to underwriters in an underwritten public offering, addressed to the Financial Counterparties, (2) by using commercially reasonable efforts to cause its outside counsel to the Issuer to deliver an opinion in form, scope and substance as is customarily given in an underwritten public offering, including a standard “10b-5” letter for such offering, addressed to the Financial Counterparties, and (3) by providing a standard officer’s certificate from the chief executive officer or chief financial officer, or other officers serving such functions, of the Issuer addressed to the Financial Counterparties and (d) shall take such other reasonable action as requested by the Financial Counterparties in order to expedite or facilitate the Brokerage Trades.

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c. 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 negotiation or consummation of a transaction by the Issuer or its subsidiaries is pending or an event has occurred, which negotiation, consummation or event that the Issuer’s board of directors reasonably believes, upon the advice of legal counsel, would require additional disclosure by the Issuer in the Registration Statement of material information that (x) the Issuer has a bona fide business purpose for keeping confidential or (y) cannot be immediately provided (but shall be provided as promptly as practicable) and the non-disclosure of which in the Registration Statement would be expected, in the reasonable determination of the Issuer’s board of directors, upon the advice of legal counsel, to cause the Registration Statement to fail to comply with applicable disclosure requirements (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 sixty (60) consecutive calendar days, or more than ninety (90) total calendar days, in each case during any twelve-month period. Upon receipt of any written notice from the Issuer of the happening of any Suspension Event 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 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 Acquired Shares under the Registration Statement (excluding, for the avoidance of doubt, sales conducted pursuant to Rule 144) 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 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 unless otherwise required by law or subpoena. 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 Acquired Shares in Subscriber’s possession; provided, however, that this obligation to deliver or destroy all copies of the prospectus covering the Acquired Shares shall not apply (1) to the extent Subscriber is required to retain a copy of such prospectus (x) in order to comply with applicable legal, regulatory, self-regulatory or professional requirements or (y) in accordance with a bona fide pre-existing document retention policy or (2) to copies stored electronically on archival servers as a result of automatic data back-up.

d. Subscriber may deliver written notice (an “Opt-Out Notice”) to the Issuer requesting that Subscriber not receive notices from the Issuer otherwise required by this Section 7; 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 two (2) business days in advance of such intended use, and if a notice of a Suspension Event was

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previously delivered (or would have been delivered but for the provisions of this Section 7(d)) 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.

e. The Issuer shall, notwithstanding any termination of this Subscription Agreement, indemnify, defend and hold harmless Subscriber (to the extent a seller under the Registration Statement), the officers, directors and agents of Subscriber, and each person who controls Subscriber (within the meaning of Section 15 of the Securities Act or Section 20 of the Exchange Act) to the fullest extent permitted by applicable law, from and against any and all out-of-pocket losses, claims, damages, liabilities, costs (including, without limitation, reasonable attorneys’ fees) and expenses (collectively, “Losses”), as incurred, that arise out of or are based upon (i) 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 any form of prospectus or supplement thereto, in light of the circumstances under which they were made) not misleading, or (ii) any violation or alleged violation by the Issuer of the Securities Act, Exchange Act or any state securities law or any rule or regulation thereunder, in connection with the performance of its obligations under this Section 7, except 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 Subscriber expressly for use therein or Subscriber has omitted a material fact from such information or otherwise violated the Securities Act, Exchange Act or any state securities law or any rule or regulation thereunder; provided, however, that the indemnification contained in this Section 7 shall not apply to amounts paid in settlement of any Losses if such settlement is effected without the consent of the Issuer (which consent shall not be unreasonably withheld, conditioned or delayed), nor shall the Issuer be liable for any Losses to the extent they arise out of or are based upon a violation which occurs (1) in reliance upon and in conformity with written information furnished by Subscriber, (2) in connection with any failure of such person to deliver or cause to be delivered a prospectus made available by the Issuer in a timely manner or (3) in connection with any offers or sales effected by or on behalf of Subscriber in violation of Section 7(c) hereof. 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 7 of which the Issuer receives notice in writing. Such indemnity shall remain in full force and effect regardless of any investigation made by or on behalf of an indemnified party and shall survive the Transfer of the Acquired Shares by Subscriber.

f. Subscriber shall, severally and not jointly, indemnify and hold harmless the Issuer, its directors, officers, agents and employees, and each person who controls the Issuer (within the meaning of Section 15 of the Securities Act and Section 20 of the Exchange Act), to the fullest extent permitted by applicable law, from and against all Losses, as incurred, (i) arising out of or 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 (ii) arising out of or relating to any omission or alleged omission of a material fact required to be stated therein or

21

necessary to make the statements therein (in the case of any prospectus, or any form of prospectus or supplement thereto, in light of the circumstances under which they were made) not misleading, with respect to (i) and/or (ii), to the extent, but only to the extent, that such untrue or alleged untrue statements or omissions or alleged omissions are based upon information regarding Subscriber furnished in writing to the Issuer by Subscriber expressly for use therein; provided, however, that the indemnification contained in this Section 7(f) shall not apply to amounts paid in settlement of any Losses if such settlement is effected without the consent of Subscriber (which consent shall not be unreasonably withheld, conditioned or delayed). 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 Acquired Shares giving rise to such indemnification obligation. Subscriber shall notify the Issuer promptly of the institution, threat or assertion of any proceeding arising from or in connection with the transactions contemplated by this Section 7(f) of which Subscriber is aware. Such indemnity shall remain in full force and effect regardless of any investigation made by or on behalf of an indemnified party and shall survive the Transfer of the Acquired Shares by Subscriber.

8. 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 (a) such date and time as the Combination Agreement is validly terminated in accordance with the terms therein, (b) upon the mutual written agreement of each of the parties hereto to terminate this Subscription Agreement, (c) if any of the conditions to Closing set forth in Sections 2(c) and 2(d) are not satisfied on or prior to the Closing Date and, as a result thereof, the transactions contemplated by this Subscription Agreement are not consummated at the Closing, (d) at the election of Subscriber, 90 days after the “Outside Date” as defined in the Combination Agreement (without any amendment thereto effected after the date hereof); provided, that if any action for specific performance or other equitable relief by Madeleine Charging, the Company or the Issuer with respect to the Combination Agreement, any other transaction agreement, or otherwise with respect to the Transactions is commenced or pending on or before the Outside Date, then the Outside Date shall be automatically extended without any further action by any party until the date that is 30 days following the date on which a final, non-appealable order has been entered with respect to such action and the Outside Date shall be deemed to be such later date for all purposes of this Agreement, or (e) two years from the Effective Date of the Registration Statement; 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 out-of-pocket losses, liabilities or damages arising from such breach. The Issuer shall promptly notify in writing Subscriber of the termination of the Combination Agreement promptly after the termination of such agreement.

9. Trust Account Waiver. Subscriber acknowledges that Spartan is a blank check company with the powers and privileges to effect a merger, asset acquisition, reorganization or similar business combination involving Spartan and one or more business or assets. Subscriber further acknowledges that, as described in Spartan’s prospectus relating to its initial public offering dated February 10, 2021 (the “Prospectus”), available at www.sec.gov, substantially all of Spartan’s assets consist of the cash proceeds of Spartan’s initial public offering and private placements of its securities, and substantially all of those proceeds have been deposited in a trust account (the “Trust Account”) for the benefit of Spartan, its public stockholders and the underwriters of Spartan’s initial public offering. Except with respect to interest earned on the funds

22

held in the Trust Account that may be released to Spartan to pay its obligations, if any, the cash in the Trust Account may be disbursed only for the purposes set forth in the Prospectus. For and in consideration of Spartan entering into this Subscription Agreement, the receipt and sufficiency of which are hereby acknowledged, Subscriber, on behalf of itself and its representatives, hereby irrevocably waives any and all right, title and interest, or any claim of any kind they have or may have in the future arising out of this Subscription Agreement, in or to any monies held in the Trust Account, and agrees not to seek recourse against the Trust Account as a result of, or arising out of, this Subscription Agreement; provided, however, that nothing in this Section 9 shall be deemed to limit any Subscriber’s right, title, interest or claim to the Trust Account by virtue of such Subscriber’s record or beneficial ownership of securities of Spartan acquired by any means, including but not limited to any redemption right with respect to any such securities of Spartan.

10. Risk Factors. Subscriber acknowledges having received and read the Risk Factors in the document titled “Project Athena – PIPE Presentation_vFinal” located in folder 1.6.5 of the virtual data room related to the Transactions (the “Risk Factors”). Subscriber understands and accepts all of the risks set forth in the Risk Factors in connection with Subscriber’s investment in the Acquired Shares.

11. Miscellaneous.

a. Each party hereto acknowledges that the other parties hereto and the Placement Agents will rely on the acknowledgments, understandings, agreements, representations and warranties contained in this Subscription Agreement; provided, however, that the foregoing clause of this Section 11(a) shall not give the Placement Agents any rights other than those expressly set forth herein. Prior to the Closing, Subscriber agrees to promptly notify the Issuer if any of the acknowledgments, understandings, agreements, representations and warranties made by such party as set forth herein are no longer accurate in all material respects. Subscriber further acknowledges and agrees that the Placement Agents are third-party beneficiaries of the representations and warranties of Subscriber contained in Section 5.

b. Each of the Issuer, Spartan and Subscriber 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 proceeding or official inquiry with respect to the matters covered hereby to the extent required by law or by regulatory bodies.

c. Notwithstanding anything to the contrary in this Subscription Agreement, prior to the Closing, Subscriber may not transfer or assign all or a portion of its rights under this Subscription Agreement other than to its controlled affiliates, subsidiaries or any fund or account managed by the same investment manager as Subscriber or an affiliate or subsidiary, without the prior consent of the Issuer; provided, that, such transferee or assignee agrees in writing to be bound by and subject to the terms and conditions of this Subscription Agreement, makes the representations and warranties in Section 5 and completes Schedule A hereto. In the event of such a transfer or assignment, Subscriber shall update Schedule B to provide the information required therein. Notwithstanding the foregoing, if Subscriber effects a transfer of its Acquired Shares after the Closing and prior to the Effective Date, then Subscriber may assign all or a portion of the rights associated with such Acquired Shares under Section 7 hereto to any such transferee; provided that such transferee agrees in writing to be bound by and subject to the terms and conditions of Section 7 (and any other related provisions) hereto, and provides Issuer with the requisite contact information.

23

d. All the agreements, representations and warranties made by each party hereto in this Subscription Agreement shall survive the Closing.

e. The Issuer may request from Subscriber such additional information as the Issuer may reasonably deem necessary to evaluate the eligibility of Subscriber to acquire the Acquired Shares, and Subscriber shall provide such information as may be reasonably requested, to the extent readily available and to the extent consistent with its internal policies and procedures; provided, that the Issuer agrees to keep any such information provided by Subscriber confidential.

f. 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.

g. 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.

h. 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.

i. This Subscription Agreement may be executed in three (3) or more counterparts (including by electronic means), all of which shall be considered one and the same agreement and shall become effective when signed by each of the parties and delivered to the other parties, it being understood that all parties need not sign the same counterpart.

j. Each party shall pay all of its own expenses in connection with this Subscription Agreement and the transactions contemplated herein.

k. Any notice or communication required or permitted hereunder shall be in writing and either delivered personally, emailed or telecopied, 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) upon receipt of an appropriate electronic answerback or confirmation when so delivered by telecopy (to such number specified below or another number or numbers as such person may subsequently designate by notice given hereunder), (iii) when sent, with no mail undeliverable or other rejection notice, if sent by email, or (iv) five (5) 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;

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(ii) if to Spartan, to:

Spartan Acquisition Corp. III

9 West 57^th Street, 43^rd Floor

New York, NY 10019

Attention: Geoffrey Strong; Joseph Romeo

Email: gstrong@apollo.com; jromeo@apollo.com

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

Vinson & Elkins L.L.P.

1001 Fannin Street, Suite 2500

Houston, TX 77002

Attention: Ramey Layne; Lande Spottswood

Email: rlayne@velaw.com; lspottswood@velaw.com; and

(iii) if to the Issuer, to:

Athena Pubco B.V.

Westervoortsedijk 73 KB

6827 AV Arnhem

Attention: Julien Touati; Mathieu Bonnet

Email: j.touati@meridiam.com; mathieu.bonnet@allego.eu

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

Weil, Gotshal & Manges LLP

767 Fifth Avenue

New York, NY 10153

Attn: Matthew J. Gilroy

Amanda Fenster

Benjamin de Blegiers

E-mail: matthew.gilroy@weil.com

amanda.fenster@weil.com

benjamin.deblegiers@weil.com

l. 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.

THE PARTIES HERETO IRREVOCABLY SUBMIT TO THE EXCLUSIVE JURISDICTION OF THE UNITED STATES DISTRICT COURT FOR THE SOUTHERN DISTRICT OF NEW YORK, THE SUPREME COURT OF THE STATE OF NEW YORK AND THE FEDERAL COURTS OF THE UNITED STATES OF AMERICA LOCATED IN THE STATE OF NEW YORK SOLELY IN RESPECT OF THE INTERPRETATION AND ENFORCEMENT OF THE PROVISIONS OF THIS SUBSCRIPTION AGREEMENT AND

25

THE DOCUMENTS REFERRED TO IN THIS SUBSCRIPTION AGREEMENT AND IN RESPECT OF THE TRANSACTIONS CONTEMPLATED HEREBY, AND HEREBY WAIVE, AND AGREE NOT TO ASSERT, AS A DEFENSE IN ANY ACTION, SUIT OR PROCEEDING FOR INTERPRETATION OR ENFORCEMENT HEREOF OR ANY SUCH DOCUMENT THAT IS NOT SUBJECT THERETO OR THAT SUCH ACTION, SUIT OR PROCEEDING MAY NOT BE BROUGHT OR IS NOT MAINTAINABLE IN SAID COURTS OR THAT VENUE THEREOF MAY NOT BE APPROPRIATE OR THAT THIS SUBSCRIPTION AGREEMENT OR ANY SUCH DOCUMENT MAY NOT BE ENFORCED IN OR BY SUCH COURTS, AND THE PARTIES HERETO IRREVOCABLY AGREE THAT ALL CLAIMS WITH RESPECT TO SUCH ACTION, SUIT OR PROCEEDING SHALL BE HEARD AND DETERMINED BY SUCH A NEW YORK STATE OR FEDERAL COURT. THE PARTIES HEREBY CONSENT TO AND GRANT ANY SUCH COURT JURISDICTION OVER THE PERSON OF SUCH PARTIES AND OVER THE SUBJECT MATTER OF SUCH DISPUTE AND AGREE THAT MAILING OF PROCESS OR OTHER PAPERS IN CONNECTION WITH SUCH ACTION, SUIT OR PROCEEDING IN THE MANNER PROVIDED IN SECTION 11(k) OR IN SUCH OTHER MANNER AS MAY BE PERMITTED BY LAW SHALL BE VALID AND SUFFICIENT SERVICE THEREOF.

EACH PARTY ACKNOWLEDGES AND AGREES THAT ANY CONTROVERSY WHICH MAY ARISE UNDER THIS SUBSCRIPTION AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY 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 SUBSCRIPTION AGREEMENT OR THE TRANSACTIONS CONTEMPLATED BY THIS SUBSCRIPTION 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) SUCH PARTY UNDERSTANDS AND HAS CONSIDERED THE IMPLICATIONS OF THE FOREGOING WAIVER; (III) SUCH PARTY MAKES THE FOREGOING WAIVER VOLUNTARILY AND (IV) SUCH PARTY HAS BEEN INDUCED TO ENTER INTO THIS SUBSCRIPTION AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVER AND CERTIFICATIONS IN THIS SECTION 11(l).

m. Spartan shall, by 9:00 a.m., New York City time, on the first (1st) business day immediately following the date of this Subscription Agreement, issue one or more press releases or file with the Commission a Current Report on Form 8-K (collectively, the “Disclosure Document”) disclosing all material terms of the transactions contemplated hereby, the Transactions, and any other material, nonpublic information that the Issuer has provided to Subscriber at any time prior to the filing of the Disclosure Document. From and after the issuance of the Disclosure Document, to the Issuer’s knowledge, Subscriber shall not be in possession of any material, nonpublic information received from Spartan or the Issuer or any of their respective officers, directors or employees or indirectly from the Placement Agents. Notwithstanding anything in this Subscription Agreement to the contrary, neither Spartan nor the Issuer shall publicly disclose the name of Subscriber or any of its affiliates, or include the name of Subscriber

26

or any of its affiliates in any press release or in any filing with the Commission or any regulatory agency or trading market, without the prior written consent of Subscriber, except (i) as required by the federal securities law in connection with the Registration Statement, (ii) in a press release or marketing materials of Spartan or the Issuer in connection with the Transactions to the extent any such disclosure is substantially equivalent to the information that has previously been made public without breach of the obligation under this Section 10(m), and (iii) to the extent such disclosure is required by law, at the request of the Staff of the Commission or regulatory agency or under the regulations of the NYSE, in which case the Issuer and Spartan shall provide Subscriber with prior written notice of such disclosure permitted under this subclause (iii); provided, to the extent any of the foregoing documents or materials reference the Subscriber or its affiliates by name, the applicable party shall use its commercially reasonable efforts to consult with the Subscriber in advance as to its form, content and timing.

n. This Subscription Agreement may not be amended, modified, supplemented or waived (i) except by an instrument in writing, signed by the party against whom enforcement of such amendment, modification, supplement or waiver is sought and (ii) without the prior written consent of Spartan and the Issuer (not to be unreasonably withheld, conditioned or delayed); 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 parties.

o. The parties agree that irreparable damage would occur if any provision of this Subscription Agreement were not performed in accordance with the terms hereof, and accordingly, that the parties hereto shall be entitled to seek an injunction or injunctions to prevent breaches of this Subscription Agreement or to enforce specifically the performance of the terms and provisions of this Subscription Agreement in an appropriate court of competent jurisdiction as set forth in Section 11(l), in addition to any other remedy to which any party is entitled at law or in equity.

[Signature pages follow.]

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

SPARTAN ACQUISITION CORP. III
By:
	Name: Geoffrey Strong
	Title: Chief Executive Officer
ATHENA PUBCO B.V.
By:
	Name: Julien Touati
	Title: Management Board Member

Signature Page to

Subscription Agreement

SUBSCRIBER:

Signature of Subscriber:

By:                                                                                            

Name:

Title:

Name of Subscriber:

(Please print. Please indicate name and

capacity of person signing above)

Name in which securities are to be registered

(if different):

Email Address:                                                                     

Subscriber’s EIN:                                                                

Address:

Attn:                                                                                         

Telephone No.:                                                                    

Facsimile No.:                                                                      

Aggregate Number of Acquired Shares subscribed for:                                                                                            

Aggregate Purchase Price: $                                            

You must pay 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.

Signature Page to

Subscription Agreement

SCHEDULE A

ELIGIBILITY REPRESENTATIONS OF SUBSCRIBER

This Schedule must be completed by Subscriber and forms a part of the Subscription Agreement to which it is attached. Capitalized terms used and not otherwise defined in this Schedule have the meanings given to them in the Subscription Agreement. Subscriber must check the applicable box in either Part A or Part B below and the applicable box in Part C below.

A. QUALIFIED INSTITUTIONAL BUYER STATUS

(Please check the applicable subparagraphs):

☐ Subscriber is a “qualified institutional buyer” (as defined in Rule 144A under the Securities Act (a “QIB”)).

☐ Subscriber is subscribing for the Acquired Shares as a fiduciary or agent for one or more investor accounts, and each owner of such accounts is a QIB.

*** OR ***

B. INSTITUTIONAL ACCREDITED INVESTOR STATUS

(Please check the applicable subparagraphs):

Subscriber is an institutional “accredited investor” (within the meaning of Rule 501(a) under the Securities Act) and has checked below the box(es) for the applicable provision under which Subscriber qualifies as such:

☐ Subscriber is an organization described in Section 501(c)(3) of the Internal Revenue Code of 1986, as amended, corporation, Massachusetts or similar business trust, limited liability company or partnership not formed for the specific purpose of acquiring the securities of the Issuer being offered in this offering, with total assets in excess of $5,000,000.

☐ Subscriber is a “private business development company” as defined in Section 202(a)(22) of the Investment Advisers Act of 1940.

☐ Subscriber is a “bank” as defined in Section 3(a)(2) of the Securities Act.

☐ Subscriber is a “savings and loan association” or other institution as defined in Section 3(a)(5)(A) of the Securities Act, whether acting in its individual or fiduciary capacity.

☐ Subscriber is a broker or dealer registered pursuant to Section 15 of the Exchange Act.

☐ Subscriber is an investment adviser registered pursuant to Section 203 of the Investment Advisers Act of 1940 or registered pursuant to the laws of a state.

☐ Subscriber is an investment adviser relying on the exemption from registering with the Commission under Section 203(l) or (m) of the Investment Advisers Act of 1940..

Schedule A-1

☐ Subscriber is an “insurance company” as defined in Section 2(a)(13) of the Securities Act.

☐ Subscriber is an investment company registered under the Investment Company Act of 1940.

☐ Subscriber is a “business development company” as defined in Section 2(a)(48) of the Investment Company Act of 1940.

☐ Subscriber is a “Small Business Investment Company” licensed by the U.S. Small Business Administration under either Section 301(c) or (d) of the Small Business Investment Act of 1958.

☐ Subscriber is a “Rural Business Investment Company” as defined in Section 384A of the Consolidated Farm and Rural Development Act.

☐ Subscriber is 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, and such plan has total assets in excess of $5,000,000.

☐ Subscriber is an employee benefit plan within the meaning of the Employee Retirement Income Security Act of 1974 if the investment decision is made by a plan fiduciary, as defined in Section 3(21) of such act, which is one of the following.

☐ A bank;

☐ A savings and loan association;

☐ A insurance company; or

☐ A registered investment adviser.

☐ Subscriber is an employee benefit plan within the meaning of the Employee Retirement Income Security Act of 1974 with total assets in excess of $5,000,000.

☐ Subscriber is an employee benefit plan within the meaning of the Employee Retirement Income Security Act of 1974 that is a self-directed plan with investment decisions made solely by persons that are accredited investors.

☐ Subscriber is a trust with total assets in excess of $5,000,000, not formed for the specific purpose of acquiring the securities offered by the Issuer in this offering, whose purchase is directed by a sophisticated person as described in Rule 506(b)(2)(ii) under the Securities Act.

☐ Subscriber is a “family office,” as defined in rule 202(a)(11)(G)-1 under the Investment Advisers Act of 1940 that was not formed for the specific purpose of acquiring the securities of the Issuer being offered in this offering, with total assets in excess of $5,000,000 and whose prospective investment is directed by a person who has such knowledge and experience in financial and business matters that such family office is capable of evaluating the merits and risks of the prospective investment.

Schedule A-2

☐ Subscriber is an entity, including but not limited to Indian tribes, governmental bodies, funds, and entities organized under the laws of foreign countries, that own “Investments,” in excess of $5,000,000 and was not formed for the specific purpose of acquiring the securities offered and is not of the type listed in one of the above checkboxes in this section. For the purposes of this response, “Investments” has the meaning in Rule 2a-51 under the Investment Company Act of 1940, as amended.

☐ Subscriber is an entity in which all of the equity owners are accredited investors under one or more of the above criteria

☐ Subscriber is not a natural person.

*** AND ***

C. AFFILIATE STATUS

(Please check the applicable box)

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.

Schedule A-3

SCHEDULE B

SCHEDULE OF TRANSFERS

Subscriber’s Subscription was in the amount of _________________ Ordinary Shares. The following transfers of a portion of the Subscription have been made:

Date of Transfer or Reduction Transferee Number of
Transferee
Acquired
Shares
Transferred
or Reduced Subscriber
Revised
Subscription
Amount

Schedule B as of ______________, 20__, accepted and agreed to as of this ____ day of ____________, 20__ by:

ATHENA PUBCO B.V.
By:
	Name: Julien Touati
	Title: Managing Director
Signature of Subscriber:
[SUBSCRIBER]
By:
	Name:
	Title:

Schedule B-1