Filed Pursuant to Rule 424(b)(3)

Registration Statement No. 333-259916

SPARTAN ACQUISITION CORP. III

9 West 57th Street, 43rd Floor

New York, NY 10019

NOTICE OF SPECIAL MEETING OF STOCKHOLDERS

OF SPARTAN ACQUISITION CORP. III

To Be Held On March 8, 2022

To the Stockholders of Spartan Acquisition Corp. III:

NOTICE IS HEREBY GIVEN that the special meeting (the “special meeting”) of stockholders of Spartan Acquisition Corp. III (“Spartan,” “we,” “our,” “us” or the “Company”) will be held at 11:00 AM, Eastern time, on March 8, 2022, via live webcast at the following address: https://www.cstproxy.com/spartanspaciii/2022. At the special meeting, Spartan stockholders will be asked to consider and vote upon the following proposals:

The special meeting will be completely virtual. There will be no physical meeting location and the special meeting will only be conducted via live webcast at the following address: https://www.cstproxy.com/spartanspaciii/2022.

Only holders of record of shares of Spartan Class A Common Stock and Spartan Founders Stock at the close of business on January 18, 2022 are entitled to notice of the virtual special meeting and to vote at the virtual special meeting and any adjournments or postponements thereof. A complete list of Spartan Stockholders of record entitled to vote at the virtual special meeting will be available at the virtual special meeting and for ten days before the virtual special meeting at Spartan’s principal executive offices for inspection by stockholders during ordinary business hours for any purpose germane to the virtual special meeting.

Spartan’s outstanding Class A Common Stock and public warrants, which are exercisable for shares of Spartan Class A Common Stock under certain circumstances, are currently listed for trading on the NYSE under the symbols “SPAQ” and “SPAQ.WS,” respectively. In addition, certain of Spartan’s shares of Spartan Class A Common Stock and public warrants currently trade as units consisting of one share of Spartan Class A Common Stock and one-fourth of one warrant, and are listed for trading on the NYSE under the symbol “SPAQ.U” The units will automatically separate into the component securities upon consummation of the Business Combination and, as a result, will no longer trade as a separate security.

Pursuant to our Charter (as defined below), we are providing the holders of shares of Spartan Class A Common Stock originally sold as part of the units issued in Spartan’s initial public offering (the “IPO” and such holders, the “public stockholders”) with the opportunity to redeem, upon the closing of the Business Combination (the “Closing”), shares of Spartan Class A Common Stock then held by them for cash equal to their pro rata share of the aggregate amount on deposit (as of two business days prior to the Closing) in the trust account (the “Trust Account”) that holds the proceeds (including interest not previously released to Spartan to pay its franchise and income taxes) from the IPO and a concurrent private placement of warrants to our Sponsor. For illustrative purposes, based on the fair value of cash and marketable securities held in the Trust Account as of September 30, 2021 of approximately $552.0 million, the estimated per share redemption price would have been approximately $10.00. Public stockholders may elect to redeem their shares whether or not they are holders as of the record date and whether or not they vote for the Business Combination Proposal. Notwithstanding the foregoing redemption rights (as provided in Section 9.2 of the amended and restated charter of Spartan (the “Charter”), the “Redemption Rights”), a public stockholder, together with any of his, her or its affiliates or any other person with whom he, she or it is acting in concert or as a “group” (as defined under Section 13(d)(3) of the Securities Exchange Act of 1934, as amended), will be restricted from redeeming in the aggregate his, her or its shares or, if part of such a group, the group’s shares, in excess of 15% of the outstanding shares of Spartan Class A Common Stock sold in the IPO. Holders of Spartan’s outstanding warrants sold in the IPO, which are exercisable for shares of Spartan Class A Common Stock under certain circumstances, do not have Redemption Rights in connection with the Business Combination. Our Sponsor, officers and directors have agreed to waive their Redemption Rights in connection with the consummation of the Business Combination with respect to any shares of Spartan Class A Common Stock they may hold, and shares of Spartan Founders Stock will be excluded from the pro rata calculation used to determine the per share redemption price. Our Sponsor, officers and directors did not receive any compensation in exchange for their agreement to waive their Redemption Rights. Currently, our Sponsor, officers and directors own an aggregate of approximately 20% of our outstanding Spartan Class A Common Stock and Spartan Founders Stock (if they were considered a single class), including all of the shares of Spartan Founders Stock. Our Sponsor, officers and directors have agreed to vote any shares of Spartan Class A Common Stock and Spartan Founders Stock held by them in favor of the Business Combination.

We may not consummate the Business Combination unless the Business Combination Proposal is approved at the special meeting, and the approval of the Governance Proposal is conditioned on the approval of the Business Combination Proposal. The Adjournment Proposal is not conditioned on the approval of any other Proposal set forth in the accompanying proxy statement/prospectus. The approval of the Governance Proposal and the Adjournment Proposal requires the affirmative vote (online or by proxy) of the holders of a majority of the shares of Spartan Class A Common Stock and Spartan Founders Stock entitled to vote and actually cast thereon at the special meeting (provided a quorum is present online or by proxy), voting as a single class. Approval of the Business Combination Proposal requires the affirmative vote (online or by proxy) of the holders of a majority of the outstanding shares of Spartan Class A Common Stock and Spartan Founders Stock entitled to vote thereon at the special meeting (provided a quorum is present online or by proxy), voting as a single class.

As of September 30, 2021, there was approximately $552.0 million in the Trust Account, which Spartan intends to use for the purpose of consummating the Business Combination. Each redemption of shares of Spartan Class A Common Stock held by public stockholders will decrease the amount in the Trust Account. Spartan will not consummate the Business Combination if the redemption of shares would result in Spartan’s failure to have at least $5,000,001 of net tangible assets. In addition, the Business Combination Agreement includes a condition to closing that the amount of cash in the Trust Account shall be an aggregate amount of not less than $150,000,000 after giving effect to the exercise of any Redemption Rights by stockholders of Spartan and the closing of the private placement in which a number of investors agreed to purchase an aggregate of 15,000,000 Allego Ordinary Shares from Allego N.V. for a purchase price of $10.00 per share for an aggregate purchase price of $150,000,000.

Following the consummation of the Business Combination, Madeleine, the sole shareholder of Allego prior to the Business Combination, will own approximately 59% of Allego’s outstanding Ordinary Shares and will have the right to direct the voting of an additional 15% of Allego’s outstanding Ordinary Shares, pursuant to an irrevocable voting power of attorney granted by E8 Investor to Madeleine (assuming that no public stockholders elect to have their public shares redeemed, that none of the Spartan Warrants are exercised, and that E8 Investor elects to receive shares in Allego, as more fully described in the accompanying proxy statement/prospectus). As a result, Madeleine will be able to control matters requiring shareholder or board approval, including the election of directors, approval of any potential acquisition of Allego, changes to Allego’s organizational documents and significant corporate transactions. This concentration of ownership and voting power makes it unlikely that any other holder or group of holders of Allego’s securities will be able to affect the way Allego is managed or the direction of its business. The interests of Madeleine with respect to matters potentially or actually involving or affecting Allego, such as future acquisitions, financings and other corporate opportunities and attempts to acquire Allego may conflict with the interests of other shareholders. Although E8 Investor is unaffiliated with Madeleine, due to the irrevocable voting power of attorney granted by E8 Investor to Madeleine, the board of directors of Madeleine will be responsible for determining how to vote Allego Ordinary Shares held by each of Madeleine and E8 Investor. Following the consummation of the Business Combination, the Spartan Stockholders will own approximately 18% of Allego’s outstanding Ordinary Shares (assuming that no public stockholders elect to have their public shares redeemed and that none of the Spartan Warrants are exercised). For more information, see the section entitled “Certain Relationships and Related Person Transactions—Allego Related Party Transactions” of the accompanying proxy statement/prospectus.

YOUR VOTE IS VERY IMPORTANT, REGARDLESS OF THE NUMBER OF SHARES OF COMMON STOCK OF SPARTAN YOU OWN. To ensure your representation at the special meeting, please complete and return the enclosed proxy card or submit your proxy by following the instructions maintained in the accompanying proxy statement/prospectus and on your proxy card. Please submit your proxy promptly, whether or not you expect to attend the special meeting. If you hold your shares in “street name,” you should instruct your broker, bank or other nominee how to vote in accordance with the voting instruction form you received from your broker, bank or other nominee.

The board of directors of Spartan has unanimously approved the Business Combination Agreement and the transactions contemplated thereby and recommends that you vote “FOR” the Business Combination Proposal, “FOR” the Governance Proposal and “FOR” the Adjournment Proposal.

If you sign, date and return your proxy card without indicating how you wish to vote, your proxy will be voted “FOR” each of Proposal Nos. 1, 2 and 3. If you fail to return your proxy card or fail to submit your proxy by telephone or over the Internet, or fail to instruct your bank, broker or other nominee how to vote, and do not virtually attend the special meeting, the effect will be that your shares will not be counted for purposes of determining whether a quorum is present at the special meeting and, if a quorum is present, will have no effect on the Governance Proposal or the Adjournment Proposal, but will have the same effect as a vote “AGAINST” the Business Combination Proposal. If you are a stockholder of record and you virtually attend the special meeting and wish to vote, you may withdraw your proxy and vote online at the special meeting.

Your attention is directed to the proxy statement/prospectus accompanying this notice (including the annexes thereto) for a more complete description of the Business Combination and related transactions and each

of our Proposals. We encourage you to read the accompanying proxy statement/prospectus carefully. Please pay particular attention to the section entitled “Risk Factors” in the accompanying proxy statement/prospectus. If you have any questions or need assistance voting your shares, please call our proxy solicitor, Morrow Sodali LLC at (800) 662-5200.

TO EXERCISE YOUR REDEMPTION RIGHTS, YOU MUST ELECT TO HAVE SPARTAN REDEEM YOUR SHARES FOR A PRO RATA PORTION OF THE FUNDS HELD IN THE TRUST ACCOUNT AND TENDER YOUR SHARES TO SPARTAN’S TRANSFER AGENT AT LEAST TWO BUSINESS DAYS PRIOR TO THE VIRTUAL SPECIAL MEETING. YOU MAY TENDER YOUR SHARES EITHER BY DELIVERING YOUR SHARE CERTIFICATE TO THE TRANSFER AGENT OR BY DELIVERING YOUR SHARES ELECTRONICALLY USING THE DEPOSITORY TRUST COMPANY’S DWAC (DEPOSIT WITHDRAWAL AT CUSTODIAN) SYSTEM. IF THE BUSINESS COMBINATION IS NOT COMPLETED, THEN THESE SHARES WILL NOT BE REDEEMED FOR CASH. IF YOU HOLD THE SHARES IN STREET NAME, YOU WILL NEED TO INSTRUCT THE ACCOUNT EXECUTIVE AT YOUR BANK OR BROKER TO WITHDRAW THE SHARES FROM YOUR ACCOUNT IN ORDER TO EXERCISE YOUR REDEMPTION RIGHTS IN ACCORDANCE WITH THE CHARTER.

Thank you for your consideration of these matters.

PROXY STATEMENT FOR SPECIAL MEETING OF STOCKHOLDERS OF

SPARTAN ACQUISITION CORP. III

and

PROSPECTUS FOR UP TO 55,200,000 ORDINARY SHARES, 23,160,000 WARRANTS AND 23,160,000

ORDINARY SHARES ISSUABLE UPON EXERCISE OF WARRANTS

OF

Athena Pubco B.V.

Dear Spartan Acquisition Corp. III Stockholders,

On July 28, 2021, Spartan Acquisition Corp. III, a Delaware corporation (“Spartan”), Athena Pubco B.V., a Dutch private limited liability company (besloten vennootschap met beperkte aansprakelijkheid) (“Allego”), Athena Merger Sub, Inc., a Delaware corporation (“Merger Sub”), Madeleine Charging B.V., a Dutch private limited liability company (besloten vennootschap met beperkte aansprakelijkheid) (“Madeleine”), Allego Holding B.V., a Dutch private limited liability company (besloten vennootschap met beperkte aansprakelijkheid) (“Allego Holding,” and, together with Allego, Merger Sub and Madeleine, the “Company Parties”), and, solely with respect to the sections specified therein, E8 Partenaires, a French société par actions simplifée (“E8 Investor”), entered into a Business Combination Agreement and Plan of Reorganization (the “Business Combination Agreement”). The transactions contemplated by the Business Combination Agreement are collectively referred to herein as the “Business Combination.”

Pursuant to the Business Combination Agreement, at the closing of the Business Combination (the “Closing”), among other things:

At the Effective Time, as a result of the Spartan Merger: (a) all shares of Spartan Common Stock held in the treasury of Spartan will be automatically cancelled for no consideration; (b) each share of Spartan Common Stock issued and outstanding immediately prior to the Effective Time (other than Redemption Shares (as defined below)) will be cancelled and converted into one validly issued, fully paid and non-assessable Allego Ordinary Share (the “Per Share Merger Consideration”); (c) each share of common stock of Merger Sub, par value $0.0001 per share, issued and outstanding immediately prior to the Effective Time will be converted into and exchanged for one validly issued, fully paid and non-assessable share of common stock of the Surviving Corporation; (d) Allego will assume that certain warrant agreement dated February 8, 2021 by and between Spartan and Continental Stock Transfer & Trust Company (the “Warrant Agreement”), and enter into such amendments thereto as may be necessary such that each of the Spartan warrants governed thereby and then outstanding and unexercised (each, a “Spartan Warrant”) will automatically be converted into a warrant to acquire one Allego Ordinary Share (each resulting warrant, an “Assumed Warrant”), which Assumed Warrants, pursuant to a warrant assumption agreement by and among Spartan, Allego and Continental Stock Transfer & Trust Company (the “Warrant Assumption Agreement”), will be subject to the same terms and conditions (including exercisability terms) as were applicable to the corresponding Spartan Warrant immediately prior to the Effective Time; and (e) each share of Spartan Class A Common Stock issued and outstanding immediately prior to the Effective Time with respect to which a Spartan stockholder has validly exercised its Redemption Rights (such shares, collectively, the “Redemption Shares”) will not be converted into and become a share of the Surviving Corporation, and will not entitle the holder to receive the Per Share Merger Consideration, and, at the Effective Time, will instead be converted into the right to receive a cash amount from the Surviving Corporation calculated in accordance with such Spartan stockholder’s Redemption Rights.

Spartan’s outstanding Class A Common Stock and public warrants, which are exercisable for shares of Spartan Class A Common Stock under certain circumstances, are currently listed for trading on the New York Stock Exchange (“NYSE”) under the symbols “SPAQ” and “SPAQ.WS,” respectively. In addition, certain shares of Spartan Class A Common Stock and public warrants currently trade as units consisting of one share of Spartan Class A Common Stock and one-fourth of one warrant, and are listed for trading on the NYSE under the symbol “SPAQ.U” The units will automatically separate into the component securities upon consummation of the Business Combination and, as a result, will no longer trade as a separate security.

Spartan Acquisition Sponsor III LLC, a Delaware limited liability company (the “Sponsor”), and Spartan’s officers and directors have agreed to (a) vote all of their shares of Spartan Founders Stock and all of their shares of Spartan Class A Common Stock in favor of the Business Combination Proposal and (b) not redeem any of their shares of Spartan Class A Common Stock in connection with the stockholder approval contemplated herein. The Founder Shares will automatically convert into shares of Spartan Class A Common Stock upon consummation of the Business Combination on a one-for-one basis. In connection with the execution of the Business Combination Agreement, but effective as of the Closing, pursuant to the Founder Stock Agreement, our Sponsor and each of Jan C. Wilson and John M. Stice, our independent directors, agreed to irrevocably waive any and all rights each such party has or will have with respect to the adjustment to the initial conversion ratio as set forth in the Charter, effective immediately prior to the Closing.

In connection with the execution of the Business Combination Agreement, on July 28, 2021, Spartan and Allego entered into separate subscription agreements with a number of investors (collectively, the “Subscribers”),

pursuant to which the Subscribers agreed to purchase an aggregate of 15,000,000 Allego Ordinary Shares from Allego N.V., for a purchase price of $10.00 per share and an aggregate purchase price of $150,000,000, in a private placement.

Following the consummation of the Business Combination, Madeleine, the sole shareholder of Allego prior to the Business Combination, will own approximately 59% of Allego’s outstanding Ordinary Shares and will have the right to direct the voting of an additional 15% of Allego’s outstanding Ordinary Shares, pursuant to an irrevocable voting power of attorney granted by E8 Investor to Madeleine (assuming that no public stockholders elect to have their public shares redeemed, that none of the Spartan Warrants are exercised, and that E8 Investor elects to receive shares in Allego, as more fully described in the accompanying proxy statement/prospectus). As a result, Madeleine will be able to control matters requiring shareholder or board approval, including the election of directors, approval of any potential acquisition of Allego, changes to Allego’s organizational documents and significant corporate transactions. This concentration of ownership and voting power makes it unlikely that any other holder or group of holders of Allego’s securities will be able to affect the way Allego is managed or the direction of its business. The interests of Madeleine with respect to matters potentially or actually involving or affecting Allego, such as future acquisitions, financings and other corporate opportunities and attempts to acquire Allego may conflict with the interests of other shareholders. Although E8 Investor is unaffiliated with Madeleine, due to the irrevocable voting power of attorney granted by E8 Investor to Madeleine, the board of directors of Madeleine will be responsible for determining how to vote Allego Ordinary Shares held by each of Madeleine and E8 Investor. Following the consummation of the Business Combination, the Spartan Stockholders will own approximately 18% of Allego’s outstanding Ordinary Shares (assuming that no public stockholders elect to have their public shares redeemed and that none of the Spartan Warrants are exercised). For more information, see the section entitled “Certain Relationships and Related Person Transactions—Allego Related Party Transactions” of the accompaning proxy statement/prospectus.

Spartan is holding a special meeting of its stockholders in order to obtain the stockholder approvals necessary to complete the Business Combination. At the special meeting of stockholders, which will be held on March 8, 2022, at 11:00 AM, Eastern time, via live webcast at https://www.cstproxy.com/spartanspaciii/2022, Spartan will ask its stockholders to approve and adopt the Business Combination Agreement and the Business Combination, and to approve the other proposals described in this proxy statement/prospectus.

After careful consideration, the board of directors of Spartan (the “Spartan Board”) has unanimously approved the Business Combination Agreement and related transactions and each of the other proposals described in this proxy statement/prospectus, and has determined that it is advisable to consummate the Business Combination. The Spartan Board unanimously recommends that its stockholders vote “FOR” the approval of the Business Combination Agreement and “FOR” the other proposals described in this proxy statement/prospectus.

Your vote is very important, regardless of the number of shares of Spartan Common Stock you own. To ensure your representation at the special meeting, please complete, sign, date and return the enclosed proxy card in the postage-paid envelope provided. If you hold your shares in “street name,” which means your shares are held of record by a broker, bank or other nominee, you should follow the instructions provided by your broker, bank or nominee to ensure that votes related to the shares you beneficially own are properly counted. Please submit your proxy promptly, whether or not you expect to attend the special meeting, but in any event, no later than March 7, 2022 at 11:59 PM, Eastern time.

More information about Spartan, Allego and the proposed transactions is included in this proxy statement/prospectus. Spartan urges you to read the accompanying proxy statement/prospectus, including the financial statements and annexes and other documents referred to herein, carefully and in their entirety. IN PARTICULAR, YOU SHOULD CAREFULLY CONSIDER THE MATTERS DISCUSSED UNDER THE SECTION ENTITLED “RISK FACTORS” OF THIS PROXY STATEMENT/PROSPECTUS.

On behalf of our board of directors, I thank you for your support and look forward to the successful completion of the Business Combination.

This proxy statement/prospectus is dated February 10, 2022 and is first being mailed to the stockholders of Spartan on or about that date.

NEITHER THE U.S. SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES REGULATORY AGENCY HAS APPROVED OR DISAPPROVED OF THE TRANSACTIONS DESCRIBED IN THIS PROXY STATEMENT/PROSPECTUS OR ANY OF THE SECURITIES TO BE ISSUED IN THE BUSINESS COMBINATION OR THE OTHER TRANSACTIONS DESCRIBED IN THIS PROXY STATEMENT/PROSPECTUS, PASSED UPON THE MERITS OR FAIRNESS OF THE BUSINESS COMBINATION OR RELATED TRANSACTIONS OR PASSED UPON THE ADEQUACY OR ACCURACY OF THE DISCLOSURE IN THIS PROXY STATEMENT/PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY CONSTITUTES A CRIMINAL OFFENSE.

TABLE OF CONTENTS

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ABOUT THIS PROXY STATEMENT/PROSPECTUS

This document, which forms part of a registration statement on Form F-4 filed with the U.S. Securities and Exchange Commission, or the “SEC,” by Allego, constitutes a prospectus of Allego under Section 5 of the U.S. Securities Act of 1933, as amended, or the “Securities Act,” with respect to the ordinary shares of Allego, with a nominal value of twelve euro cents (EUR 0.12) per share (“Allego Ordinary Shares”), to be issued to holders of shares of Spartan Class A Common Stock (the “Spartan Stockholders”), the Assumed Warrants to be issued to warrant holders and the Allego Ordinary Shares underlying such warrants, if the Business Combination described herein is consummated. This document also constitutes a notice of meeting and a proxy statement under Section 14(a) of the U.S. Securities Exchange Act of 1934, as amended, or the “Exchange Act,” with respect to the special meeting of Spartan Stockholders at which Spartan Stockholders will be asked to consider and vote upon a proposal to approve the Business Combination by the adoption of the Business Combination Agreement, among other matters.

Unless otherwise stated or unless the context otherwise requires, all references to “we,” “us,” “our,” “Allego,” or the “Company” in this proxy statement/prospectus refer to (i) Allego Holding B.V. and its subsidiaries prior to the consummation of the Business Combination and (ii) Allego N.V. (the successor to Athena Pubco B.V.) and its subsidiaries, including Allego Holding and Spartan, following the consummation of the Business Combination.

This information is available without charge to you upon written or oral request. To make this request, you should contact our proxy solicitor at:

Morrow Sodali LLC

333 Ludlow Street

5th Floor, South Tower

Stamford, Connecticut 06902

Telephone: (800) 662-5200

(banks and brokers call collect at (203) 658-9400)

Email: SPAQ.info@investor.morrowsodali.com

To obtain timely delivery of requested materials, you must request the information no later than five business days prior to the date of the virtual special meeting.

You may also obtain additional information about us from documents filed with the SEC by following the instruction in the section entitled “Where You Can Find More Information.”

FINANCIAL STATEMENT PRESENTATION

Athena Pubco B.V. was incorporated by Madeleine on June 3, 2021 for the purpose of effectuating the Business Combination described herein. Athena Pubco B.V. has no material assets and does not operate any businesses. Accordingly, no financial statements have been included in this proxy statement/prospectus. The Business Combination will result in Athena Pubco B.V. acquiring Allego Holding and combining with Spartan, with an exchange of the shares and warrants issued by Spartan for those of Athena Pubco B.V. (which will be reclassified as Allego N.V. in connection with the Closing). The Business Combination will be accounted for as a capital reorganization followed by the combination with Spartan, which will be treated as a recapitalization. Following the Business Combination, both Allego Holding and Spartan will be wholly owned subsidiaries of Allego N.V.

The financial statements for Allego Holding are included in this proxy statement/prospectus for the years ended December 31, 2020 and 2019 and as of December 31, 2020, December 31, 2019 and January 1, 2019 (the “Allego Consolidated Financial Statements”).

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INDUSTRY AND MARKET DATA

In this proxy statement/prospectus, we present industry data, forecasts, information and statistics regarding the markets in which Allego competes as well as Allego management’s analysis of statistics, data and other information that it has derived from third parties, including independent consultant reports, publicly available information, various industry publications and other published industry sources, including: (i) traffic data from governmental agencies, such as Germany’s BAST (Bundesanstalt für Straßenwesen), the Netherlands’ Rijkswaterstaat, and the United Kingdom’s Department of Transport, (ii) population data from EUROSTAT, (iii) registered cars data from governmental statistics agencies, such as Germany’s Kraftfahrt Bundesamt, the Netherlands’ CBS (Centraal Bureau voor de Statistiek) and the United Kingdom’s Department of Transport, (iv) electric vehicle sales forecasts from consultancy firms, such as ING, UBS, BCG and Navigant, (v) electric vehicle sales data from the European Automobile Manufacturers’ Association, and (vi) industry growth forecasts from BloombergNEF. Independent consultant reports, industry publications and other published industry sources generally indicate that the information contained therein was obtained from sources believed to be reliable. Such information is supplemented where necessary with our own internal estimates and information obtained from discussions with our customers, taking into account publicly available information about other industry participants and our management’s judgment where information is not publicly available. This information appears in “Summary of the Proxy Statement/Prospectus,” “Information Related to Allego,” “Allego Management’s Discussion and Analysis of Financial Condition and Results of Operations” and other sections of this proxy statement/prospectus.

Although we believe that these third-party sources are reliable, we cannot guarantee the accuracy or completeness of this information, and we have not independently verified this information. Forecasts and other forward-looking information obtained from these sources are subject to the same qualifications and uncertainties as the other forward-looking statements in this proxy statement/prospectus. These forecasts and forward-looking information are subject to uncertainty and risk due to a variety of factors, including those described under “Risk Factors.” These and other factors could cause results to differ materially from those expressed in any forecasts or estimates. Some market data and statistical information are also based on our good faith estimates, which are derived from management’s knowledge of our industry and such independent sources referred to above. Certain market, ranking and industry data included elsewhere in this proxy statement/prospectus, including the size of certain markets and our size or position and the positions of our competitors within these markets, including its services relative to its competitors, are based on estimates by us. These estimates have been derived from Allego management’s knowledge and experience in the markets in which Allego operates, as well as information obtained from surveys, reports by market research firms, our customers, distributors, suppliers, trade and business organizations and other contacts in the markets in which Allego operates and have not been verified by independent sources. Unless otherwise noted, all of Allego’s market share and market position information presented in this proxy statement/prospectus is an approximation. Allego’s market share and market position, unless otherwise noted, is based on Allego’s volume relative to the estimated volume in the markets served by Allego’s business segments. References herein to Allego being a leader in a market or product category refer to Allego management’s belief that Allego has a leading market share position in each specified market, unless the context otherwise requires. As there are no publicly available sources supporting this belief, it is based solely on Allego management’s internal analysis of Allego volume as compared to the estimated volume of its competitors.

Internal data and estimates are based upon information obtained from trade and business organizations and other contacts in the markets in which Allego operates and Allego management’s understanding of industry conditions. Although we believe that such information is reliable, this information has not been verified by any independent sources.

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FREQUENTLY USED TERMS

In this document:

“Allego” means (i) prior to the consummation of the Business Combination, Allego Holding B.V. and (ii) following the consummation of the Business Combination, Allego N.V. Simultaneously with Closing, Athena Pubco B.V. will be redesignated as Allego N.V., such that the go-forward public company will be Allego N.V. (“Allego N.V.”).

“Allego Articles” means the Articles of Association of Allego N.V., following the Business Combination.

“Allego Holding” means Allego Holding B.V., a Dutch private limited liability company (besloten vennootschap met beperkte aansprakelijkheid).

“Allego Holding Shares” means the shares of Allego Holding immediately prior to the Business Combination, with a nominal value of €1.00 per share.

“Allego N.V.” has the meaning set forth in the definition of “Allego” above.

“Allego Ordinary Shares” means the ordinary shares of Allego N.V. immediately following the Business Combination, with a nominal value of €0.12 per share.

“Assumed Warrants” means the Spartan Warrants that are automatically converted in connection with the Business Combination into warrants to acquire one Allego Ordinary Share, and remain subject to the same terms and conditions (including exercisability) as were applicable to the corresponding Spartan Warrant immediately prior to the Business Combination.

“Available Cash” means the aggregate amount of cash in the Trust Account, less any payments required to be made by Spartan in connection with the exercise of the Redemption Rights, plus all cash proceeds received from the Private Placement.

“Business Combination” means the transactions contemplated by the Business Combination Agreement.

“Business Combination Agreement” means the Business Combination Agreement and Plan of Reorganization, dated as of July 28, 2021, by and among Allego, Allego Holding, Spartan, Madeleine, and, solely with respect to the sections specified therein, E8 Investor.

“Charter” means Spartan’s Amended and Restated Certificate of Incorporation dated February 8, 2021.

“Closing” means the consummation of the Business Combination.

“Closing Date” means the date on which the Closing takes place.

“Closing Cash” means (i) the sum of the fair market value (expressed in United States dollars) of all cash and cash equivalents (including marketable securities, checks, bank deposits and short term investments) of Allego Holding and its subsidiaries, minus (ii) all amounts in respect of any outstanding checks written by Allego Holding or its subsidiaries, in each case, calculated in accordance with Section 2.03 of the Business Combination Agreement; provided that Closing Cash shall not include certain excluded cash.

“Closing Debt” means the outstanding principal amount of, accrued and unpaid interest on, and other payment obligations (including any prepayment premiums, breakage costs and other related fees or liabilities payable on the Closing Date as a result of the prepayment thereof or the consummation of the transactions contemplated by

3

the Business Combination Agreement) arising under, any obligations of Allego Holding or any of its subsidiaries consisting of (i) indebtedness for borrowed money or indebtedness issued in substitution or exchange for borrowed money, or (ii) indebtedness evidenced by any note, bond, debenture or other debt security, in each case, calculated in accordance with Section 2.03 of the Business Combination Agreement. Notwithstanding the foregoing, “Closing Debt” shall not include any (w) obligations under operating leases or capitalized leases, (x) undrawn letters of credit, (y) obligations under any interest rate, currency or other hedging agreements (other than breakage costs payable upon termination thereof on the Closing Date) or (z) expenses incurred in connection with the Business Combination Agreement, including the E8 Payment Amount.

“Company Parties” means, collectively, Allego Holding, Merger Sub, Allego and Madeleine.

“Company Valuation” means $2,467,500,000, plus (i) the aggregate amount of Closing Cash, minus (ii) the aggregate amount of Closing Debt, minus (iii) the E8 Payment Amount and minus (iv) without duplication of amounts included in clause (iii), any stamp, transfer, goods and services, VAT or similar taxes imposed on or borne by Allego, Allego Holding, any of its subsidiaries or Spartan in respect of the issuance of the Contribution Consideration.

“Contribution Consideration” means a number of Allego Ordinary Shares equal to the quotient determined by dividing (i) the Company Valuation by (ii) $10.00.

“Deadline Date” means February 11, 2023.

“DGCL” means the General Corporation Law of the State of Delaware.

“E8 Investor” means E8 Partenaires, a French société par actions simplifée.

“E8 Payment Amount” means (i) all amounts payable in cash to E8 Investor in connection with the transactions contemplated by the Business Combination Agreement, plus (ii) any stamp, withholding, transfer, goods and services, VAT, or similar taxes imposed on or borne by Allego, Allego Holding, any of its subsidiaries or Spartan in respect of cash, equity or other property received by E8 Investor or its affiliates in connection with the transactions contemplated by the Business Combination Agreement.

“Group” means Allego Holding B.V. and its subsidiaries.

“IFRS” means International Financial Reporting Standards as issued by the International Accounting Standards Board and adopted by the European Union.

“IPO” means the initial public offering of Spartan’s Units, consummated on February 11, 2021.

“LTIP” means the Allego Long-Term Incentive Plan.

“Madeleine” means Madeleine Charging B.V., a Dutch private limited liability company (besloten vennootschap met beperkte aansprakelijkheid).

“Merger Sub” means Athena Merger Sub, Inc., a Delaware corporation.

“PIPE Shares” means the Allego Ordinary Shares to be issued in the Private Placement.

“Private Placement” means the commitments obtained from certain investors for a private placement of an aggregate of 15,000,000 Allego Ordinary Shares, for a purchase price of $10.00 per share and an aggregate purchase price of $150,000,000.

“private placement warrants” means the warrants issued to the Sponsor in a private placement simultaneously with the closing of the IPO.

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“public warrants” means the warrants sold as part of the Spartan Units.

“Redemption Rights” means the redemption rights provided for in Section 9.2 of Article IX in the Charter.

“SEC” means the United States Securities and Exchange Commission.

“Spartan” means Spartan Acquisition Corp. III, a Delaware corporation.

“Spartan Class A Common Stock” means Spartan’s Class A common stock, par value $0.0001 per share.

“Spartan Common Stock” means, together, the Spartan Class A Common Stock and Spartan Founders Stock.

“Spartan Founders Stock” means Spartan’s Class B common stock, par value $0.0001 per share.

“Spartan Stockholders” means the holders of Spartan Common Stock.

“Spartan Units” means the units sold in connection with Spartan’s IPO.

“Spartan Warrants” means the private placement warrants and the public warrants, collectively.

“Special Fees Agreement” means the Special Fees Agreement by and between Madeleine and E8 Investor dated as of December 16, 2020, as amended.

“Sponsor” means Spartan Acquisition Sponsor III LLC, a Delaware limited liability company.

“Subscription Agreements” means the subscription agreements entered into by the investors in the Private Placement.

“Trust Account” means the trust account that holds the cash proceeds from the IPO and concurrent private placement of private placement warrants to the Sponsor.

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QUESTIONS AND ANSWERS ABOUT THE BUSINESS COMBINATION

The following questions and answers briefly address some commonly asked questions about the proposals to be presented at the special meeting of stockholders of Spartan, including the Business Combination. The following questions and answers do not include all the information that is important to Spartan Stockholders. We urge Spartan Stockholders to carefully read this entire proxy statement/prospectus, including the annexes and other documents referred to herein.

For purposes of this section, Athena Pubco B.V. is referred to as “Allego” and Allego Holding B.V. is referred to as “Allego Holding”. References to “we”, “us” and “our” refer to Spartan.

QUESTIONS AND ANSWERS ABOUT SPARTAN’S SPECIAL STOCKHOLDER MEETING AND THE BUSINESS COMBINATION

A copy of the Business Combination Agreement is attached to this proxy statement/prospectus as Annex A. This proxy statement/prospectus and its annexes contain important information about the Business Combination and the other matters to be acted upon at the special meeting. You should read this proxy statement/prospectus and its annexes carefully and in their entirety.

Your vote is important. You are encouraged to submit your proxy as soon as possible after carefully reviewing this proxy statement/prospectus and its annexes.

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Your vote is important. Stockholders are encouraged to submit their completed proxy card as soon as possible after carefully reviewing this proxy statement/prospectus.

At the Effective Time, as a result of the Spartan Merger:

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For a diagram showing the expected post-Closing corporate structure, please see the subsection entitled “Summary of the Proxy Statement/Prospectus — Organizational Structure”. Following the Closing, there will no longer be any shares of Spartan Founders Stock outstanding. For more information about the Business Combination Agreement and the Business Combination, see the section entitled “The Business Combination.”

On February 11, 2021, Spartan completed the IPO of 55,200,000 units, including 7,200,000 units that were issued pursuant to the underwriters’ full exercise of their over-allotment option, with each unit consisting of one share of Spartan Class A Common Stock and one-fourth of one warrant, with each whole warrant

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entitling the holder to purchase one share of Spartan Class A Common Stock at a price of $11.50 per share, generating gross proceeds to Spartan of $552,000,000. Since the IPO, Spartan’s activity has been limited to the search for a prospective Initial Business Combination.

The Spartan Board considered a wide variety of factors in connection with its evaluation of the Business Combination, including its review of the results of the due diligence conducted by Spartan’s management and Spartan’s advisors. As a result, the Spartan Board concluded that a transaction with Allego Holding would present the most attractive opportunity to maximize value for Spartan Stockholders, and the Spartan Board ultimately determined that the Business Combination with Allego Holding was the most attractive potential transaction for Spartan. Please see the subsection entitled “The Business Combination — The Spartan Board’s Reasons for the Approval of the Business Combination.”

Please see the section entitled “Management of Allego Following the Business Combination.”

No Redemption, No Exercise of Spartan Warrants Scenario:

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The ownership percentages with respect to Allego set forth above (a) assume (i) that no public stockholders elect to have their public shares redeemed, (ii) that none of Spartan’s initial stockholders purchase shares of Spartan Class A Common Stock in the open market prior to the Closing, (iii) Allego will have $102,057,000 in net debt as of two business days prior to the Closing Date, (iv) that there are no other issuances of equity interests of Spartan or Allego N.V. prior to the Closing, (v) the E8 Election (as defined herein) occurs and (vi) a cash-settled portion of historical consulting fees equal to $87,330,901, and (b) does not take into account Spartan Warrants that will remain outstanding following the Business Combination and may be exercised at a later date or the issuance of any shares upon completion of the Business Combination under the LTIP (the “No Redemption Scenario”). As a result of the Business Combination, the economic and voting interests of Spartan’s public stockholders will decrease.

No Redemption, Exercise of All Spartan Warrants Scenario:

If the facts are different than the above assumptions, the percentage ownership retained by Spartan’s existing stockholders in Allego following the Business Combination will be different. For example, if we assume that all 13,800,000 public warrants that are outstanding and all 9,360,000 private placement warrants that are outstanding were exercised following completion of the Business Combination and further assume that no public stockholders elect to have their public shares redeemed (and each other assumption set forth in the preceding paragraph remains the same), then the ownership of Allego would be as follows:

Maximum Redemption, No Exercise of Spartan Warrants Scenario:

If we assume the maximum redemption scenario described under the section entitled “Unaudited Pro Forma Condensed Combined Financial Information,” i.e., 55,200,000 shares of Spartan Class A Common Stock are redeemed, the assumptions set forth in clauses (a)(ii)–(v) and (b) under the “No Redemption, No Exercise of Spartan Warrants Scenario” above remain true, and the cash-settled portion of historical

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consulting fees will be equal to $0 (the “Maximum Redemption Scenario”), the ownership of Allego upon the Closing will be as follows:

Maximum Redemption, Exercise of All Spartan Warrants Scenario:

If the facts are different than the above assumptions, the percentage ownership retained by Spartan’s existing stockholders in Allego following the Business Combination will be different. For example, if we assume that all 13,800,000 public warrants that are outstanding and all 9,360,000 private placement warrants that are outstanding were exercisable and exercised following completion of the Business Combination and further assume the maximum redemption scenario described under the section entitled “Unaudited Pro Forma Condensed Combined Financial Information,” i.e., 55,200,000 shares of Spartan Class A Common Stock are redeemed (and each other assumption set forth in the preceding paragraph remains the same), then the ownership of Allego would be as follows:

Please see the subsections entitled “Summary of the Proxy Statement/Prospectus — Total Allego Ordinary Shares to Be Issued in the Business Combination,” “Description of Allego’s Securities and Articles of Association” and the section entitled “Unaudited Pro Forma Condensed Combined Financial Information” for further information. Please see the immediately succeeding question for information on an additional redemption scenario.

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In addition to the changes in percentage ownerships depicted above, variation in the levels of redemption will impact the dilutive effect of certain equity issuances related to the Business Combination, which would not otherwise be present in an underwritten public offering. Increasing levels of redemption will increase the dilutive effects of these issuances on non-redeeming Spartan Stockholders.

The following table shows the dilutive effect and the effect on the per share value of Allego Ordinary Shares held by non-redeeming Spartan Stockholders under a range of redemption scenarios and Spartan Warrant exercise scenarios:

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All stockholders as of the record date, or their duly appointed proxies, may attend the special meeting, which will be a completely virtual meeting. There will be no physical meeting locations and the special meeting will only be conducted via live webcast. Stockholders may attend the special meeting online, including to vote and submit questions, at the following address: https://www.cstproxy.com/spartanspaciii/2022.

To attend online and participate in the special meeting, stockholders of record will need to visit https://www.cstproxy.com/spartanspaciii/2022 and enter the 12 digit control number provided on your proxy card, regardless of whether you pre-registered.

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If the Spartan Merger qualifies as a reorganization within the meaning of Section 368(a) of the Code and qualifies as a transaction described in Section 351 of the Code (including that it is not excluded from the application of such provisions pursuant to Section 367 of the Code), holders generally will not recognize gain or loss upon the exchange of Spartan Class A Common Stock and Spartan Warrants for Allego Ordinary Shares and Assumed Warrants pursuant to the Spartan Merger. If the Spartan Merger fails to qualify as a reorganization within the meaning of Section 368(a) of the Code and/or fails to qualify as a transaction described in Section 351, holders may recognize gain upon the exchange of Spartan Class A Common Stock and Spartan Warrants for Allego Ordinary Shares and Assumed Warrants pursuant to the Spartan Merger. In light of the significant uncertainty regarding the tax treatment of the Spartan Merger, you are strongly urged to read the section entitled “Material U.S. Federal Income Tax Considerations—Material U.S. Federal Income Tax Considerations with Respect to the Spartan Merger for Holders of Spartan Class A Common Stock and Spartan Warrants” and to consult with, and rely solely upon, your tax advisors to determine the particular U.S. federal, state, local, or foreign income or other tax consequences of the Spartan Merger to you.

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Continental Stock Transfer & Trust Company

1 State Street, 30^th Floor

New York, New York 10004-1561

Attention: Mark Zimkind

Email: mzimkind@continentalstock.com

A public stockholder, together with any of his, her or its affiliates or any other person with whom it is acting in concert or as a “group” (as defined in Section 13(d)(3) of the Exchange Act), will be restricted from seeking Redemption Rights with respect to his, her or its shares or, if part of such a group, the group’s shares, in excess of the 15% threshold. Accordingly, all public shares in excess of the 15% threshold beneficially held by a public stockholder or group will not be redeemed for cash. In order to determine whether a stockholder is acting in concert or as a “group” (as defined in Section 13(d)(3) of the Exchange Act) with any other stockholder, Spartan will require each public stockholder seeking to exercise Redemption Rights to certify to Spartan whether such stockholder is acting in concert or as a group with any other stockholder. Stockholders seeking to exercise their Redemption Rights and opting to deliver physical certificates should allot sufficient time to obtain physical certificates from the Transfer Agent and time to effect delivery. It is our understanding that stockholders should generally allot at least two weeks to obtain physical certificates from the Transfer Agent.

However, we do not have any control over this process and it may take longer than two weeks. Stockholders who hold their shares in street name will have to coordinate with their bank, broker or other nominee to have the shares certificated or delivered electronically.

Holders of our outstanding units must separate the underlying public shares and public warrants prior to exercising Redemption Rights with respect to the public shares. If you hold units registered in your own name, you must deliver the certificate for such units or deliver such units electronically to Continental Stock

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Transfer & Trust Company with written instructions to separate such units into public shares and public warrants. This must be completed far enough in advance to permit the mailing of the public share certificates or electronic delivery of the public shares back to you so that you may then exercise your Redemption Rights with respect to the public shares following the separation of such public shares from the units.

If a broker, dealer, commercial bank, trust company or other nominee holds your units, you must instruct such nominee to separate your units. Your nominee must send written instructions by facsimile to Continental Stock Transfer & Trust Company. Such written instructions must include the number of units to be split and the nominee holding such units. Your nominee must also initiate electronically, using The Depository Trust Company’s (“DTC”) DWAC (deposit withdrawal at custodian) system, a withdrawal of the relevant units and a deposit of the corresponding number of public shares and public warrants. This must be completed far enough in advance to permit your nominee to exercise your Redemption Rights with respect to the public shares following the separation of such public shares from the units. While this is typically done electronically on the same business day, you should allow at least one full business day to accomplish the separation. If you fail to cause your public shares to be separated in a timely manner, you will likely not be able to exercise your Redemption Rights.

Any demand for redemption, once made, may be withdrawn at any time until the deadline for exercising redemption requests and thereafter, with our consent, until the vote is taken with respect to the Business Combination. If you delivered your shares for redemption to the Transfer Agent and decide within the required timeframe not to exercise your Redemption Rights, you may request that the Transfer Agent return the shares (physically or electronically). You may make such request by contacting our Transfer Agent at the email address or address listed under the question “Who can help answer my questions?” below.

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We expect that the amount of any distribution our public stockholders will be entitled to receive upon our dissolution will be approximately the same as the amount they would have received if they had redeemed their shares in connection with the Business Combination, subject in each case to our obligations under the DGCL to provide for claims of creditors and other requirements of applicable law. Holders of our Founder Shares have waived any right to any liquidating distributions with respect to those shares.

In the event of liquidation, there will be no distribution with respect to our outstanding warrants. Accordingly, the warrants will expire worthless.

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If you have questions about the Proposals or if you need additional copies of the proxy statement/prospectus or the enclosed proxy card you should contact:

Geoffrey Strong, Chief Executive Officer and Chairman

c/o Spartan Acquisition Corp. III

9 West 57^th Street, 43rd Floor

New York, New York 10019

Email: info@spartanspaciii.com

Tel: (212) 515-3200

You may also contact our proxy solicitor at:

Morrow Sodali LLC

333 Ludlow Street

5th Floor, South Tower

Stamford, Connecticut 06902

Telephone: (800) 662-5200

(banks and brokers call collect at (203) 658-9400)

Email: SPAQ.info@investor.morrowsodali.com

To obtain timely delivery, our stockholders must request the materials no later than five business days prior to the special meeting.

You may also obtain additional information about us from documents filed with the SEC by following the instructions in the section entitled “Where You Can Find More Information.”

If you intend to seek redemption of your public shares, you will need to send a letter demanding redemption and deliver your shares (either physically or electronically) to our Transfer Agent at least two business days prior to the special meeting in accordance with the procedures detailed under the question “How do I exercise my Redemption Rights?” If you have questions regarding the certification of your position or delivery of your shares, please contact:

Continental Stock Transfer & Trust Company

1 State Street, 30^th Floor

New York, New York 10004-1561

Attention: Mark Zimkind

Email: mzimkind@continentalstock.com

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RISK FACTORS

The following risk factors apply to the business and operations of Allego and will also apply to our business and operations following the completion of the Business Combination. These risk factors are not exhaustive and investors should carefully consider them and are encouraged to perform their own investigation with respect to the business, financial condition and prospects of Allego and our business, financial condition and prospects following the completion of the Business Combination. You should carefully consider the following risk factors in addition to the other information included in this proxy statement/prospectus, including matters addressed in the section entitled “Cautionary Note Regarding Forward-Looking Statements”. We may face additional risks and uncertainties that are not presently known to us, or that we currently deem immaterial, which may also impair our business or financial condition. The following discussion should be read in conjunction with the section entitled “Allego Management’s Discussion and Analysis of Financial Condition and Results of Operations”, the financial statements of Allego and notes to the financial statements included herein.

Risks Relating to Allego’s Business, Industry and Regulatory Environment

Allego is an early stage company with a history of operating losses, and expects to incur significant expenses and continuing losses for the near term and medium term.

Allego incurred a net loss of €43.3 million for the year ended December 31, 2020 and as of December 30, 2020, Allego had an accumulated deficit of approximately €73.7 million. Allego believes it will continue to incur net losses in each quarter for the near term. Even if it achieves profitability, there can be no assurance that it will be able maintain profitability in the future. Allego’s potential profitability is particularly dependent upon the continued adoption of EVs by consumers in Europe, which may occur at a slower pace than anticipated or may not occur at all. This continued adoption may depend upon continued support from regulatory programs and in each case, the use of Allego chargers and Allego services may be at much lower levels than Allego currently anticipates. Allego may need to raise additional financing through loans, securities offerings or additional investments in order to fund its ongoing operations. There is no assurance that Allego will be able to obtain such additional financing or that it will be able to obtain such additional financing on favorable terms.

Allego has experienced rapid growth and expects to invest substantially in growth for the foreseeable future. If it fails to manage growth effectively, its business, operating results and financial condition could be adversely affected.

Allego has experienced rapid growth in recent periods that has placed and continues to place a significant strain on employee retention, management, operations, financial infrastructure and corporate culture and has required several strategic adjustments. Allego’s revenue has increased from €25.8 million in 2019 to €44.2 million in 2020. In addition, in the event of further growth, Allego’s information technology systems and Allego’s internal control over financial reporting and procedures may not be adequate to support its operations and may increase the risk of data security incidents that may interrupt business operations and permit bad actors to obtain unauthorized access to business information or misappropriate company funds. Allego may also face risks to the extent such bad actors infiltrate the information technology infrastructure of its contractors. Allego may also face the risk that the EVCloud Platform, its core platform, is not able to support Allego’s growth due to increased traffic on Allego charging points, which would interrupt business operations. Allego could then also face contractual penalties with its customers if this results in a failure to meet its contractual obligations.

To manage growth in operations and personnel management, Allego will need to continue to improve its operational, financial and management controls and reporting systems and procedures. Failure to manage growth effectively could result in difficulty or delays in developing new EV charging sites, in attracting new customers, declines in quality or customer satisfaction, increases in costs, difficulties in introducing new solutions and services or enhancing existing solutions and services, loss of EV sites and customers, information security vulnerabilities or other operational difficulties, any of which could adversely affect its business performance and operating results.

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Allego’s forecasts and projections are based upon assumptions, analyses and internal estimates developed by Allego’s management. If these assumptions, analyses or estimates prove to be incorrect or inaccurate, Allego’s actual operating results may differ adversely and materially from those forecasted or projected.

Allego’s business forecasts and projections are subject to different parameters with significant uncertainty and are based on assumptions, analyses and internal estimates developed by Allego’s management and teams, any or all of which may not prove to be correct or accurate. If these assumptions, analyses or estimates prove to be incorrect or inaccurate, Allego’s actual operating results may differ materially and adversely from those forecasted or projected. Realization of the operating results forecasted will depend on the successful implementation of Allego’s proposed business plan, and the development of policies and procedures consistent with Allego’s assumptions. Future results will also be affected by events and circumstances beyond Allego’s control, for example, the competitive environment, Allego’s executive team, technological change, economic and other conditions in the markets in which Allego operates or proposes to operate, national and regional regulations, uncertainties inherent in product and software development and testing, Allego’s future financing needs, and Allego’s ability to grow and to manage growth effectively. In particular, Allego’s forecasts and projections include forecasts and estimates relating to the expected size and growth of the markets in which Allego operates in Europe or seeks to enter and demand for its current and future charging points. For the reasons described above, it is likely that the actual results of its operations will be different from the results forecasted and those differences may be material and adverse. The forecasts were prepared by Allego’s management and have not been certified or examined by an accountant. Neither Spartan nor Allego has any duty to update the financial projections included in this proxy statement/prospectus.

Allego’s estimates of market opportunity and forecasts of market growth may prove to be inaccurate.

Estimates of the total addressable market and serviceable addressable market for Allego’s networks and services and the EV market in general are included in this proxy statement/prospectus. Market opportunity estimates and growth forecasts, whether obtained from third-party sources or developed internally, are subject to significant uncertainty and are based on assumptions and estimates that may prove to be inaccurate. This is especially so at the present time due to the uncertain and rapidly changing projections of the severity, magnitude and duration of the coronavirus (“COVID-19”) pandemic. The estimates and forecasts included in this proxy statement/prospectus relating to the size and expected growth of the target market, market demand, EV adoption across each individual national market in Europe and use cases, capacity of automotive and battery original equipment manufacturers (“OEMs”) and ability of charging infrastructure to address this demand and related pricing may also prove to be inaccurate. In particular, estimates regarding the current and projected market opportunity for public fast and ultrafast charging or Allego market share capture are difficult to predict. The estimated addressable market may not materialize in the timeframe of the projections included herein, if ever, and even if the markets meet the size estimates and growth estimates presented in this proxy statement/prospectus, Allego’s business could fail to grow at similar rates.

Allego currently faces competition from a number of companies and expects to face significant competition in the future as the market for EV charging develops.

The EV charging market is relatively new, and competition is still developing. Apart from China, Europe is the biggest EV market in the world and is more mature than the United States. Allego competes in its charging network and services businesses with many competitors. With respect to the development of its own public EV charging network, Allego primarily competes with incumbent utilities and oil and gas companies alongside pure EV charging players and companies linked to car manufacturers. With respect to its services business, Allego competes with a variety of companies, including hardware manufacturers, software platform vendors, installation companies and maintenance contractors. Despite Allego’s longstanding European presence, it must continuously strive to remain competitive in its markets. Competition may hamper global EV adoption as an influx of providers may lead to poor service and trust in any one provider of EV charging solutions.

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In addition, there are means for charging EVs other than publicly accessible charging, which could affect the level of demand for onsite charging capabilities at public or commercial areas, which are Allego’s primary focus. For example, Tesla Inc. continues to build out its supercharger network across Europe for its vehicles, which could reduce overall demand for EV charging at other sites. Tesla may also open its supercharger network to support charging of non-Tesla EVs in the future, which could further reduce demand for charging at Allego’s sites. Additionally, third-party contractors can provide basic electric charging capabilities to potential customers of Allego, including commercial on premise charging and home charging solutions. Many EV hardware manufacturers are now offering home charging equipment, which could reduce demand for public charging if EV owners find charging at home to be more convenient. Regulations imposing home or workplace charging capabilities for all new buildings could also adversely affect the development of public charging versus home charging.

Furthermore, Allego’s current or potential competitors may be acquired by third-parties with greater available resources. As a result, competitors may be able to respond more quickly and effectively than Allego to new or changing opportunities, technologies, standards or customer requirements and may have the ability to initiate or withstand substantial price competition. In addition, competitors may in the future establish cooperative relationships with vendors of complementary products, technologies or services to increase the availability of their solutions in the marketplace. This competition may also materialize in the form of costly intellectual property disputes or litigation.

New competitors or alliances may emerge in the future that have greater market share, more widely adopted proprietary technologies, greater marketing expertise and greater financial resources, which could put Allego at a competitive disadvantage. Future competitors could also be better positioned to serve certain segments of Allego’s current or future target markets, which could increase costs and create downward pricing pressure on charging sessions. In light of these factors, even if Allego’s public charging network is larger and provides faster charging, and if its services offerings are more effective, higher quality and address more complex demands than those of its competitors, current or potential customers may accept other competitive solutions. If Allego fails to adapt to changing market conditions or continue to compete successfully with current charging providers or new competitors, its growth will be limited, which would adversely affect its business and results of operations.

Allego’s future revenue growth will depend in significant part on its ability to increase the number and size of its charging sites and the sales of services to Business to Business (“BtoB”) customers.

Allego’s future revenue growth will depend in significant part on its ability to increase the number and size of its charging sites and its sales of services to BtoB customers. The sites Allego may wish to lease or acquire may first be leased or acquired by competitors or they may no longer be economically attractive due to certain adverse conditions such as increased rent which would hamper the growth and profitability of Allego’s business.

Furthermore, Allego’s BtoB customer base may not increase as quickly as expected because the adoption of EVs may be delayed or transformed by new technologies. In addition to the factors affecting the growth of the EV market generally, transitioning to an EV fleet for some customers or providing EV equipment to facilities for other customers can be costly and capital intensive, which could result in slower than anticipated adoption. The sales cycle for certain BtoB customers could also be longer than expected.

Allego may need to raise additional funds or debt and these funds may not be available when needed. Allego is dependent on the completion of the Business Combination or other additional financing in order to continue its current operations and execute its business plan.

Allego may need to raise additional capital or debt in the future to further scale its business and expand to additional markets. Allego may raise additional funds through the issuance of equity, equity-related or debt securities, or through obtaining credit from financial institutions. Allego cannot be certain that additional funds will be available on favorable terms when required, or at all. If Allego cannot raise additional funds when needed, its financial condition, results of operations, business and prospects could be materially and adversely affected. If Allego raises funds through the issuance of debt securities or through loan arrangements, the terms of

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such arrangements could require significant interest payments, contain covenants that restrict Allego’s business, or other unfavorable terms. In addition, to the extent Allego raises funds through the sale of additional equity securities, Allego shareholders would experience additional dilution. In order to meet Allego’s funding needs for the next twelve months, Allego borrowed approximately €14,000,000 under its existing senior debt facility during the fourth quarter of 2021, which resulted in the amounts under such facility being fully drawn, and will utilize the proceeds of the Business Combination. Allego is dependent on the completion of the Business Combination or other additional financing in order to continue as a going concern.

If Allego fails to offer high-quality support to its customers and fails to maintain the availability of its charging points, its business and reputation may suffer.

Once Allego charging points are operational, customers rely on Allego to provide maintenance services to resolve any issues that might arise in the future. Rapid and high-quality customer and equipment support is important so that drivers can reliably charge their EVs. The importance of high-quality customer and equipment support will increase as Allego seeks to expand its public charging network and retain customers, while pursuing new EV drivers and geographies. If Allego does not quickly resolve issues and provide effective support, its ability to retain EV drivers or sell additional services to BtoB customers could suffer and its brand and reputation could be harmed.

Allego faces risks related to health pandemics, including the COVID-19 pandemic, which could have a material adverse effect on its business and results of operations.

The impact of COVID-19, including changes in consumer and business behavior, pandemic fears and market downturns, and restrictions on business and individual activities, has created significant volatility in the global economy and has led to reduced economic activity. The spread of COVID-19 has created supply chain disruptions for vehicle manufacturers, suppliers and hardware manufacturers, as well as impacted the capacities of installers. Any sustained downturn in demand for EVs would harm Allego’s business despite its historical growth.

Allego has modified its business practices by recommending that all non-essential personnel work from home and cancelling or shifting physical participation in sales activities, meetings, events and conferences to on-line engagement. Allego has also implemented additional safety protocols for essential workers, has implemented measures to reduce its operating costs, and may take further actions as may be required by government authorities or that it determines are in the best interests of its employees, customers, suppliers, vendors and business partners in light of COVID-19. There is no certainty that such actions will be sufficient to mitigate the risks posed by the virus or otherwise be satisfactory to government authorities. If significant portions of Allego’s workforce in the future are unable to work effectively, including due to illness, quarantines, social distancing, government actions or other restrictions in connection with the COVID-19 pandemic, its operations will be negatively impacted. Furthermore, if significant portions of its customers’ or potential customers’ workforces are subject to stay-at-home orders or otherwise have substantial numbers of their employees working remotely for sustained periods of time, user demand for EV charging sessions and services may decline.

As of June 30, 2021, the impact of COVID-19 to Allego’s business has been limited, but prospects and results of operations will depend on future developments, which are highly uncertain and cannot be predicted, including, but not limited to, the duration and spread of the pandemic, its severity, the actions to contain the virus or treat its impact, the efficacy and distribution of COVID-19 vaccines, the outbreak of new COVID-19 variants, and when and to what extent normal economic and operating activities can resume. The COVID-19 pandemic could limit the ability of customers, suppliers, vendors and business partners to perform, including third-party suppliers’ ability to provide components and materials used for Allego’s charging stations or in providing transport, installation or maintenance services. Even after the COVID-19 pandemic has subsided, Allego may continue to experience an adverse impact to its business as a result of COVID-19’s global economic impact, including any economic recession that has occurred or may occur in the future that will have an impact in the growth of EVs and in the growth of EV charging demand.

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Specifically, difficult macroeconomic conditions, such as decreases in per capita income and level of disposable income, increased and prolonged unemployment or a decline in consumer confidence as a result of the COVID-19 pandemic, as well as reduced spending by businesses, could each have a material adverse effect on the demand for Allego’s charging points network and services.

Allego relies on a limited number of suppliers and manufacturers for its hardware and equipment and charging stations. A loss of any of these partners or issues in their manufacturing and supply processes could negatively affect its business.

Allego has extended its hardware and equipment supplier base but it still relies on a limited number of suppliers, although it is not dependent on any one supplier. This reliance on a limited number of hardware manufacturers increases Allego’s risks, since it does not currently have proven alternatives or replacement manufacturers beyond these key parties. In the event of interruption or insufficient capacity, it may not be able to increase capacity from other sources or develop alternate or secondary sources without incurring material additional costs and substantial delays. In particular, disruptions or shortages at such suppliers, including as a result of delays or issues with their supply chain, including in respect of electronic chips, processors, semiconductors and other electronic components or materials, can negatively impact deliveries by such suppliers to Allego. Thus, Allego’s business could be adversely affected if one or more of its suppliers is impacted by any interruption at a particular location or decides to reduce its deliveries to Allego for any reason including its acquisition by a third-party or is unable to provide Allego with the quantities Allego requires for its growth.

If Allego experiences an increase in demand greater than expected for the development of its charging stations or from its services customers or if it needs to replace an existing supplier, it may not be possible to supplement or replace them on acceptable terms, which may undermine Allego’s ability to capture higher growth or deliver solutions to customers in a timely manner. For example, it may take a significant amount of time to identify a new hardware manufacturer that has the capability and resources to build hardware and equipment in sufficient volume that meets Allego’s specifications. Identifying suitable suppliers and manufacturers could be an extensive process that would require Allego to become satisfied with such suppliers’ and manufacturers’ quality control, technical capabilities, responsiveness and service, financial stability, regulatory compliance, and labor and other ethical practices. Accordingly, a loss of any significant suppliers or manufacturers could have an adverse effect on Allego’s business, financial condition and operating results.

Furthermore, Allego’s hardware and equipment may experience technical issues, including safety issues, which could, on a large scale, negatively impact Allego’s business and potentially in the most extreme cases lead Allego to an early replacement program of such hardware, resulting in Allego incurring substantial additional costs and delays.

Allego’s business is subject to risks associated with construction, cost overruns and delays, and other contingencies that may arise in the course of completing installations, and such risks may increase in the future as Allego expands its charging networks and increases its service to third parties.

Allego does not typically install charging points directly on leased sites or at customer sites. These installations are typically performed by Allego’s electrical contractors at its own sites or with contractors with an existing relationship with the customer and/or knowledge of the site. The installation of charging stations at a particular site is generally subject to oversight and regulation in accordance with national and local laws and regulations relating to building codes, safety, environmental protection and related matters, and typically requires various local approvals and permits, such as grid connection permits that may vary by jurisdiction. In addition, building codes, accessibility requirements or regulations may hinder EV charger installation due to potential increased costs to the developer or installer in order to meet such requirements. Meaningful delays or cost overruns may impact Allego’s recognition of revenue in certain cases and/or impact customer relationships, either of which could impact Allego’s business and profitability.

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Contractors may require that Allego or Allego’s customers obtain licenses in order to perform their services. Furthermore, additional rules on working conditions and other labor requirements may result in more complex projects with higher project management costs. If these contractors are unable to provide timely, thorough and quality installation-related services, Allego could fall behind its construction schedules which may cause EV drivers and Allego’s customers to become dissatisfied with Allego’s network and charging solutions. As the demand for public fast and ultrafast charging increases and qualifications for contractors become more stringent, Allego may encounter shortages in the number of qualified contractors available to complete all of Allego’s desired new charging stations and their maintenance.

Allego’s business model is predicated on the presence of qualified and capable electrical and civil contractors and subcontractors in the new markets it intends to enter. There is no guarantee that there will be an adequate supply of such partners. A shortage in the number of qualified contractors may impact the viability of Allego’s business plan, increase risks around the quality of work performed and increase costs if outside contractors are brought into a new market.

Allego’s business is subject to risks associated with increased cost of land and competition from third parties that can create cost overruns and delays and can decrease the value of some of Allego’s charging stations.

Allego typically enters into long-term leases for its charging stations. With the growing adoption of EVs, increased competition may develop in securing suitable sites for charging stations, especially in high traffic areas. This competition may trigger increases in the cost of land leases, tenders organized by landowners, delays in securing sites and a quicker depletion of available sites for Allego’s charging stations. The term of leases may also be impacted by increased competition. This could negatively impact the potential economic return of building such charging stations in certain zones or on certain sites and therefore negatively impact Allego’s business and profitability.

Allego’s business is subject to risks associated with the price of electricity which may hamper its profitability and growth.

Allego obtains electricity for its own charging stations through contracts with power suppliers or through direct sourcing on the market. In most of the countries in which Allego operates, there are many suppliers which can offer medium or long term contracts which can allow Allego to hedge the price of electricity. However, market conditions may change, triggering fluctuations and global increases in the price of electricity. For example, the price of electricity is generally higher in the winter due to higher electricity demands. While these costs could be passed on to EV customers, increases in the price of electricity could result in near-term cash flow strains to Allego. In addition, global increases in electricity pricing will increase the price of charging, which could impact demand and hamper the use of public charging by EV customers, thus decreasing the number of charging sessions on Allego’s charging stations and adversely impacting its profitability and growth. Furthermore, competitors may be able to source electricity on better terms than Allego which may allow those competitors to offer lower prices for charging, which may also decrease the number of charging sessions on Allego’s charging stations and adversely impact its profitability and growth.

Allego is dependent on the availability of electricity at its current and future charging sites. Delays and/or other restrictions on the availability of electricity would adversely affect Allego’s business and results of operations.

The operation and development of Allego’s charging points is dependent upon the availability of electricity, which is beyond its control. Allego’s charging points are affected by problems accessing electricity sources, such as planned or unplanned power outages or limited grid capacity. In the event of a power outage, Allego will be dependent on the grid operator, and in some cases the site host, to restore power for its BtoB solutions or to unlock grid capacity. Any prolonged power outage or limited grid capacity could adversely affect customer experience and Allego’s business and results of operations.

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Allego’s public charging points are often located in areas that must be freely accessible and may be exposed to vandalism or misuse by customers or other individuals, which would increase Allego’s replacement and maintenance costs.

Allego’s public charging points may be exposed to vandalism or misuse by customers and other individuals, increasing wear and tear of the charging equipment. Such increased wear and tear could shorten the usable lifespan of the chargers and require Allego to increase its spending on replacement and maintenance costs.

Allego’s EV driver base will depend upon the effective operation of Allego’s EVCloud Platform and its applications with mobile service providers, firmware from hardware manufacturers, mobile operating systems, networks and standards that Allego does not control.

Allego is dependent on the interoperability of mobile service providers for the payment of charging sessions that must use open protocols. Its own mobile payment application is dependent upon popular mobile operating systems that Allego does not control, such as Google’s Android and Apple’s iOS software systems, and any changes in such systems that degrade or hamper the functionality of Allego’s products or give preferential treatment to competitive products could adversely affect the usage of Allego’s applications on mobile devices. Changes in standards, such as Open Charge Point Interface or Open Charge Point Protocol, may require Allego to incur development expenses and delay its operations and the potential launch of new services. Continued support and operability of Allego’s charging stations depends upon hardware manufacturers’ firmware of which Allego has no control over. Additionally, in order to deliver high quality services to its customers, it is important that Allego’s products work well with a range of technologies, including various firmware, software, networks and standards that Allego does not control. Allego may not be successful in maintaining and updating its EVCloud Platform and may not have sufficient knowledge to effectively keep up with new technologies, systems, networks or standards.

A variety of factors may lead to interruption in service, which could harm Allego’s business.

Computer malware, viruses, physical or electronic break-ins and similar disruptions could lead to interruption and delays in Allego’s operations and loss, misuse or theft of data. Computer malware, viruses, ransomware, hacking and phishing attacks against online networks have become more prevalent and may occur on Allego’s systems in the future and on hardware manufacturers that supply Allego. Any attempts by cyber attackers to disrupt Allego’s operations, services or systems, if successful, could harm its business, introduce liability to data subjects, result in the misappropriation of company funds, be expensive to remedy and damage Allego’s reputation or brand. Insurance may not be sufficient to cover significant expenses and losses related to cyber-attacks. Efforts to prevent cyber attackers from entering computer systems are expensive to implement, and Allego may not be able to cause the implementation or enforcement of such preventions. Though it is difficult to determine what, if any, harm may directly result from any specific interruption or attack, any failure to maintain performance, reliability, security and availability of systems and technical infrastructure may, in addition to other losses, harm Allego’s reputation, brand and ability to operate reliably and to retain customers.

Allego has previously experienced, and may in the future experience, service disruptions, outages and other performance problems due to a variety of factors, including infrastructure changes, third-party service providers, scalability issues with its software tools, human or software errors and capacity constraints. Allego relies on telecom networks to support reliable operation, management and maintenance of its charger network, charging session management, and driver authentication, and payment processing by customers depends on reliable connections with wireless communications networks. As a result, Allego’s operations depend on a handful of public carriers and are exposed to disruptions related to network outages and other communications issues on the carrier networks. Disruptions experienced in the payment chain from authorization to settlement also might cause financial harm, directly or indirectly to Allego. If Allego’s services or charging points are unavailable when users attempt to access them, they may seek other services or networks, which could reduce demand for Allego’s charging stations and services.

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Allego has processes and procedures in place designed to enable it to recover from a disaster or catastrophe and continue business operations. However, there are several factors ranging from human error to data corruption that could materially impact the efficacy of such processes and procedures, including by lengthening the period of time that services are partially or fully unavailable to customers and users. It may be difficult or impossible to perform some or all recovery steps and continue normal business operations due to the nature of a particular disaster or catastrophe, especially during peak periods, which could cause additional reputational damages, contractual penalties or loss of revenues, any of which could adversely affect its business and financial results.

While Allego to date has not made material acquisitions, should it pursue acquisitions in the future, it would be subject to risks associated with acquisitions.

Allego may acquire additional assets such as public charging networks, products, technologies or businesses that are complementary to its existing business or that reinforce its core or adjacent competencies. The process of identifying and consummating acquisitions and the subsequent integration of new assets and businesses into Allego’s own business would require attention from management and could result in a diversion of resources from its existing business, which in turn could have an adverse effect on its operations. Acquired assets or businesses may not generate the expected financial results or the expected technological gains. Key employees of acquired companies may also decide to leave. Acquisitions could also result in the use of cash, potentially dilutive issuances of equity securities, the occurrence of goodwill impairment charges, amortization expenses for other intangible assets and exposure to potential unknown liabilities of the acquired business.

If Allego is unable to attract and retain key employees and hire qualified management, technical, engineering and sales personnel, its ability to compete and successfully grow its business would be harmed.

Allego’s success depends, in part, on its continuing ability to identify, hire, attract, train, develop and retain highly qualified personnel. The inability to do so effectively would adversely affect its business.

Competition for employees can be intense in the various parts of Europe where Allego operates, as there is a high demand of qualified personnel. The ability to attract, hire and retain personnel depends on Allego’s ability to provide competitive compensation. Allego may not be able to attract, assimilate, develop or retain qualified personnel in the future, and failure to do so could adversely affect its business, including the execution of its strategy.

Allego is expanding operations in many countries in Europe, which will expose it to additional tax, compliance, market, local rules and other risks.

Allego’s operations are within the European Union, and it maintains contractual relationships with parts and manufacturing suppliers in Asia. It also operates in the United Kingdom, where it has incurred delays in operations since January 1, 2021 as a result of Brexit, which commenced in 2020. Allego also intends to expand into other EEA countries. Managing this global presence and expansion in Europe requires additional resources and controls, and could subject Allego to certain risks, associated with international operations, including:

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As a result of these risks, Allego’s current expansion efforts and any potential future international expansion efforts may not be successful.

Members of Allego’s management have limited experience in operating a public company.

Allego’s executive officers have limited experience in the management of a publicly-traded company. The management team may not successfully or effectively manage the transition to a public company that will be subject to significant regulatory oversight and reporting obligations under federal securities laws. Their limited experience in dealing with the increasingly complex laws pertaining to public companies could be a significant disadvantage as an increasing amount of their time may be devoted to complying with such laws, which will result in less time being devoted to the management of the company. Allego does not currently have adequate personnel with the appropriate level of knowledge, experience and training in the accounting policies, practices or internal control over financial reporting required of public companies. The development and implementation of the standards and controls and the hiring of experienced personnel necessary to achieve the level of accounting standards required of a public company may require costs greater than expected.

Certain of Allego’s strategic and development arrangements could be terminated or may not materialize into long-term contract partnership arrangements and may restrict or limit Allego from developing arrangements with other strategic partners.

Allego has arrangements with strategic development partners and collaborators. Some of these arrangements are evidenced by memorandums of understanding, non-binding letters of intent, and early stage agreements that are used for design and development purposes but will require renegotiation at later stages of development, each of which could be terminated or may not materialize into next-stage contracts or long-term contract partnership arrangements. In addition, Allego does not currently have formal agreements with all partners and collaborators that are contemplated in the execution of its business plan. Moreover, existing or future arrangements may contain limitations on Allego’s ability to enter into strategic and development arrangements with other partners.

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If Allego is unable to maintain such arrangements and agreements, or if such agreements or arrangements contain other restrictions from or limitations on developing arrangements with other strategic partners, its business, prospects, financial condition and operating results may be materially and adversely affected.

Risks Related to the EV Market

New alternative fuel technologies may negatively impact the growth of the EV market and thus the demand for Allego’s charging stations and services.

As European regulations have required a sharp decrease in CO2 emissions in Europe, consumer acceptance of EVs and other alternative vehicles has been increasing. If new technologies such as hydrogen for light trucks or load transportation develop and are widely adopted, the demand for electric charging could diminish. In addition, the EV fueling model is different than gas or other fuel models, requiring behavioral change and education of influencers, consumers and others such as regulatory bodies. Developments in alternative technologies, such as fuel cells, compressed natural gas or hydrogen may materially and adversely affect demand for EVs and EV charging stations, which in turn would materially and adversely affect Allego’s business, operating results, financial condition and prospects.

Allego’s future growth and success is highly correlated with and thus dependent upon the continuing rapid adoption of EVs.

Allego’s future growth is highly dependent upon the adoption of EVs by consumers. The market for EVs is still rapidly evolving, characterized by rapidly changing technologies, competitive pricing and competitive factors, evolving government regulation and industry standards and changing consumer demands and behaviors and the environment generally. Although demand for EVs has grown in recent years, bolstered in part by pro-EV regulations in Europe, there is no guarantee that such demand will continue to grow. If the market for EVs develops more slowly than expected, Allego’s business, prospects, financial condition and operating results would be harmed. The market for EVs could be affected by numerous factors, such as:

In addition, sales of vehicles in the automotive industry can be cyclical, which may affect growth in acceptance of EVs. It is uncertain how macroeconomic factors will impact demand for EVs, particularly since they can be more expensive than traditional fuel-powered vehicles, when the automotive industry globally has been experiencing a recent decline in sales.

Demand for EVs may also be affected by factors directly impacting automobile prices or the cost of purchasing and operating automobiles, such as sales and financing incentives, prices of raw materials and parts and components and governmental regulations, including tariffs, import regulation and other taxes. Volatility in demand may lead to lower vehicle unit sales, which may result in reduced demand for EV charging solutions and therefore adversely affect Allego’s business, financial condition and operating results.

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The European EV market currently benefits from the availability of rebates, scrappage schemes, tax credits and other financial incentives from governments to offset and incentivize the purchase of EVs. The reduction, modification, or elimination of such benefits could cause reduced demand for EVs and EV charging, which would adversely affect Allego’s financial results.

Most European countries provide incentives to end users and purchasers of EVs and EV charging stations in the form of rebates, scrappage schemes for internal combustion engines (“ICEs”), tax credits and other financial incentives. The EV market relies on these governmental rebates, scrappage schemes for ICEs, tax credits and other financial incentives to significantly lower the effective price of EVs and EV charging stations to customers and to support widespread installation of EV charging infrastructure. However, these incentives may expire on a particular date, end when allocated funding is exhausted, or be reduced or terminated as a matter of regulatory or legislative policy. Any reduction in rebates, scrappage schemes for ICEs, tax credits or other financial incentives could reduce the demand for EVs and EV charging stations and as a result, may adversely impact Allego’s business and expansion potential. In Germany, incentives are expected to continue until 2030. In the Netherlands, these incentives are expected to continue until 2025.

The EV charging market is characterized by rapid technological change, which requires Allego to continue developing new innovations of its software platform and to keep up with new hardware technologies. Any delays in such development could adversely affect market adoption of its solutions and Allego’s financial results.

Continuing technological changes in battery and other EV technologies or payment technologies could adversely affect adoption of current EV charging technology and/or Allego’s charging network or services. Allego’s future success will depend upon its ability to develop new sites and introduce a variety of new capabilities and innovations to enhance EV drivers experience using its network and its existing services offerings.

As EV technologies change, Allego may need to upgrade or adapt its charging stations technology and introduce new hardware in order to serve vehicles that have the latest technology, in particular battery cell technology, which could involve substantial costs. This could lead Allego to replace some charging hardware before its expected lifespan involving financial costs and reduced return. Even if Allego is able to keep pace with changes in technology and develop new features and services, its research and development expenses could increase and its gross margins could be adversely affected.

Allego cannot guarantee that any new services or features of its software platform will be released in a timely manner or at all, or that if such services or features are released, that they will achieve market acceptance. Delays in delivering new services that meet customer requirements could damage Allego’s relationships with customers and lead them to seek alternative providers. For some customers, delays in delivering new services and features could induce the application of contractual penalties. Delays in introducing innovations or the failure to offer innovative services at competitive prices may cause existing and potential customers to purchase Allego’s competitors’ products or services.

If Allego is unable to devote adequate resources to develop new features and services or cannot otherwise successfully develop features or services that meet customer requirements on a timely basis or that remain competitive with technological alternatives, its charging network or services could lose market share, its revenue will decline, it may experience operating losses and its business and prospects will be adversely affected.

Risks Related to Allego’s Technology, Intellectual Property and Infrastructure

Allego may need to defend against intellectual property infringement or misappropriation claims, which may be time-consuming and expensive.

From time to time, the holders of intellectual property rights may assert their rights and urge Allego to obtain licenses, and/or may bring suits alleging infringement or misappropriation of such rights. There can be no

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assurance that Allego will be able to mitigate the risk of potential suits or other legal demands by competitors or other third parties. Accordingly, Allego may consider entering into licensing agreements with respect to such rights, although no assurance can be given that such licenses can be obtained on acceptable terms or that litigation will not occur, and such licenses and associated litigation could significantly increase Allego’s operating expenses. In addition, if Allego is determined to have or believes there is a high likelihood that it has infringed upon or misappropriated a third party’s intellectual property rights, it may be required to cease making, selling or incorporating certain key components or intellectual property into the products and services it offers, to pay substantial damages and/or royalties, to redesign its products and services, and/or to establish and maintain alternative branding. In addition, to the extent that Allego’s customers and business partners become the subject of any allegation or claim regarding the infringement or misappropriation of intellectual property rights related to Allego’s products and services, Allego may be required to indemnify such customers and business partners. If Allego were required to take one or more such actions, its business, prospects, operating results and financial condition could be materially and adversely affected. In addition, any litigation or claims, whether or not valid, could result in substantial costs, negative publicity and diversion of resources and management attention.

Allego’s business may be adversely affected if it is unable to protect its technology and intellectual property from unauthorized use by third parties.

Allego’s success depends, in part, on Allego’s ability to protect its core technology and intellectual property. To accomplish this, Allego relies on, and plans to continue relying on, trade secrets (including know-how), employee and third-party nondisclosure agreements, copyrights, trademarks, intellectual property licenses and other contractual rights to retain ownership of, and protect, its technology. Failure to adequately protect its technology and intellectual property could result in competitors offering similar products, potentially resulting in the loss of some of Allego’s competitive advantage and a decrease in revenue which would adversely affect its business, prospects, financial condition and operating results.

The measures Allego takes to protect its technology and intellectual property from unauthorized use by others may not be effective for various reasons, including:

Patent, trademark and trade secret laws vary significantly throughout the world. Some foreign countries do not protect intellectual property rights to the same extent as do the laws of the European Union or EEA countries. Further, policing the unauthorized use of its intellectual property in foreign jurisdictions may be difficult or impossible. Therefore, Allego’s intellectual property rights may not be as strong or as easily enforced outside of the European Union and EEA.

The current lack of international standards may lead to uncertainty, additional competition and further unexpected costs.

Lack of industry standards for EV station management, coupled with utilities and other large organizations mandating their own specifications that have not become widely adopted in the industry, may hinder innovation or slow new solutions and services or new feature introduction.

In addition, automobile manufacturers may choose to utilize their own proprietary systems and networks, which could lock out competition for EV charging stations, or use their size and market position to influence the market, which could limit Allego’s market and reach to customers, negatively impacting its business.

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Further, should regulatory bodies impose standards that are not compatible with Allego’s infrastructure, it may incur significant costs to adapt its business model to the new regulatory standards, which may require significant time and, as a result, may have a material adverse effect on its revenues or results of operations.

Allego’s technology could have undetected defects, errors or bugs in hardware or software which could reduce market adoption, damage its reputation with current or prospective customers, and/or expose it to product liability and other claims that could materially and adversely affect its business.

Allego may be subject to claims that its charging stations have malfunctioned and persons were injured or purported to be injured. Any insurance that Allego carries may not be sufficient or it may not apply to all situations. Similarly, to the extent that such malfunctions are related to components obtained from third-party vendors, such vendors may not assume responsibility for such malfunctions. In addition, Allego’s customers could be subjected to claims as a result of such incidents and may bring legal claims against Allego to attempt to hold it liable. Any of these events could adversely affect Allego’s brand, relationships with customers, operating results or financial condition.

Across Allego’s solutions and services line, Allego develops equipment solutions and services based on preferred second source or common off-the-shelf vendors. However, due to its design specifications, Allego does rely on certain single source vendors, the unavailability or failure to source from these vendors can pose risks to supply chain or product installation which may negatively impact Allego’s business.

Furthermore, Allego’s software platform is complex and includes a number of licensed third-party commercial and open-source software libraries. Allego’s software has contained defects and errors and may in the future contain undetected defects or errors. Allego is continuing to evolve the features and functionality of its platform through updates and enhancements, and as it does, it may introduce additional defects or errors that may not be detected until after deployment to customers. In addition, if Allego’s products and services, including any updates or patches, are not implemented or used correctly or as intended, inadequate performance and disruptions in service may result.

Any defects or errors in product or services offerings, or the perception of such defects or errors, or other performance problems could result in any of the following, each of which could adversely affect Allego’s business and results of its operations:

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Although Allego has contractual protections, such as warranty disclaimers and limitation of liability provisions in many of its agreements with customers and other business partners, such protections may not be uniformly implemented in all contracts and, where implemented, may not fully or effectively protect from claims by customers, business partners or other third parties. Any insurance coverage or indemnification obligations of suppliers may not adequately cover all such claims or cover only a portion of such claims. A successful product liability, warranty, or similar claim could have an adverse effect on Allego’s business, operating results and financial condition. In addition, even claims that ultimately are unsuccessful could result in expenditure of funds in litigation, divert management’s time and other resources and cause reputational harm.

Allego relies on some open-source software and libraries issued under the General Public License (or similar “copyleft” licenses) for development of its products and may continue to rely on similar copyleft licenses. Third parties may assert a copyright claim against Allego regarding its use of such software or libraries, which could lead to the adverse results listed above. Use of such software or libraries may also force Allego to provide third-parties, at no cost, the source code to its proprietary software, which may decrease revenue and lessen any competitive advantage Allego has due to the secrecy of its source code.

Interruptions, delays in service or inability to increase capacity, including internationally, at third-party data center facilities could impair the use or functionality of Allego’s operation, harm its business and subject it to liability.

Allego currently serves customers from third-party data center facilities operated by Microsoft Azure Services (“MAS”) located in the United States, Europe and Canada. In addition to MAS, some Allego services are housed in third-party data centers. Any outage or failure of MAS or of such data centers could negatively affect Allego’s product connectivity and performance. Furthermore, Allego depends on connectivity from its charging stations to its data centers through cellular service providers, such as KPN, a Dutch cellular service provider. Any incident affecting a data center facility’s or a cellular service provider’s infrastructure or operations, whether caused by fire, flood, severe storm, earthquake, power loss, telecommunications failures, breach of security protocols, computer viruses and disabling devices, failure of access control mechanisms, natural disasters, war, criminal act, military actions, terrorist attacks and other similar events could negatively affect the use, functionality or availability of Allego’s services.

Any damage to, or failure of, Allego’s systems, or those of its third-party providers, could interrupt or hinder the use or functionality of its services. Impairment of or interruptions in Allego’s services may reduce revenue, subject it to claims and litigation, cause customers to terminate their subscriptions, and adversely affect renewal rates and its ability to attract new customers. Allego’s business will also be harmed if customers and potential customers believe its products and services are unreliable.

Allego expects to incur research and development costs and devote significant resources to developing new solutions, services and technologies and to enhancing its existing solutions and services, which could significantly reduce its profitability and may never result in revenue to Allego.

Allego’s future growth depends on penetrating new markets, adapting existing products to new applications and customer requirements, and introducing new solutions and services that achieve market acceptance. Allego plans to incur significant research and development costs in the future as part of its efforts to design, develop, manufacture and introduce new solutions and services, new technologies and enhance existing solutions and services. Allego’s research and development expenses and related operating expenses were € 3.1m in 2020, € 4.0m in 2019 and € 3.2m in 2018, respectively, and are likely to be similar in the future. Further, Allego’s research and development program may not produce successful results, and its new solutions and services or new technologies may not achieve market acceptance, create additional revenue or become profitable. Allego’s potential inability to develop the necessary software and technology systems may harm its competitive position.

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Allego is also relying on third-party suppliers to develop a number of emerging technologies for use in its products. These technologies are not today, and may not ever be, commercially viable. There can be no assurances that Allego’s suppliers will be able to meet the technological requirements, scalability, quality, production timing, and volume requirements to support its business plan. As a result, Allego’s business plan could be significantly impacted.

Customer-Related Risks

Allego may be unable to increase the demand for its public charging network, which could adversely affect its profitability and growth.

Allego’s development strategy consists, in part, on the rollout of public charging sites with a combination mostly of fast and ultrafast charging capabilities. The growth in utilization of these charging sites is key for the profitability of Allego’s business. If utilization does not increase, if the adoption of fast and ultrafast charging is slower than expected, or if the marketing cost to increase such utilization, either directly or through third parties, is increasing widely, the profitability and growth of Allego may be adversely affected. The expected premium for fast and ultrafast charging compared to slow charging may be not be realized, hampering the growth of fast and ultrafast charging which may adversely affect Allego’s profitability and growth.

Allego’s business will depend on the utilization of its network by EV drivers and the mobility service providers (“MSPs”) to offer access to Allego’s network. If EV drivers do not continue to use Allego’s network or MSPs do not continue to offer access to Allego’s network, Allego’s business and operating results will be adversely affected.

Allego depends on traffic from EV drivers to charge on its network and from MSPs that facilitate the use of Allego’s network to a larger base of EV drivers. Allego has a very large base of MSPs and is developing its own capacity to be an MSP in order to offer additional services in the future. However, if some MSPs do not offer access to Allego’s network for whatever reason or if EV drivers do not use its network due to pricing or lack of services, among other reasons, the utilization of Allego’s sites will be hampered. EV drivers’ retention on Allego’s network may decline or fluctuate as a result of a number of factors, including satisfaction with software and features, functionality of the charging sites, prices, features and pricing of competing solutions and services, reductions in spending levels, mergers and acquisitions involving networks from competitors and deteriorating general economic conditions. If customers do not use Allego’s charging network or if they opt to use cheaper charging options, its business and operating results will be adversely affected.

Failure to effectively expand Allego’s sites could harm its ability to increase revenue.

Allego’s ability to grow the number of EV drivers using its charging network, to expand its customer base, achieve broader market share, grow revenue, and achieve and sustain profitability will depend, to a significant extent, on its ability to effectively expand its site development on the one hand and its sales and marketing operations to customers on the other hand. Site development, sales and marketing expenses represent a significant percentage of its total revenue, and its operating results may suffer if site development, sales and marketing expenditures do not increase to support revenue.

Allego is substantially dependent on its direct development team to develop new sites and sales in order to obtain new customers and contracts. Allego plans to continue to expand its development team with the support of external parties. The proper coordination and efficiency of site prospection is key to increasing Allego’s revenue. Allego may not be able to recruit, hire and retain a sufficient number of site developers, which may adversely affect its ability to expand its charging sites. New sales and marketing personnel will be needed to grow Allego’s services business as well. New hires require significant training and investment before they achieve full productivity, particularly in new sales territories. Allego may be unable to hire or retain sufficient qualified individuals. Furthermore, hiring sales personnel in new markets where Allego seeks to operate can be costly,

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complex and time-consuming, and requires additional upfront costs that may be disproportionate to the initial revenue expected from those markets. There is significant competition for direct sales personnel. Allego’s ability to achieve significant revenue growth in the future will depend, in large part, on its success in recruiting, training, incentivizing and retaining a sufficient number of qualified direct site developers and sales personnel and on such personnel attaining desired productivity levels within a reasonable amount of time. Allego’s business will be harmed if continuing investment in its site development, sales and marketing capabilities does not generate a significant increase in revenue. Allego’s operations may be unable to cope appropriately with the growth of its operating charging points, preventing it from fully benefitting from such growth. Such limitations might come from external suppliers for software and IT-related services as well as from the capacity of Allego to properly upgrade its software platform. Allego could also face contractual penalties with its services customers if it is unable to meet its contractual obligations as a result of these limitations.

Risks Relating to Ownership of Allego Securities Following the Business Combination

The Business Combination could result in Allego N.V. being treated as a U.S. corporation or a “surrogate foreign corporation” for U.S. federal income tax purposes.

Under current U.S. federal income tax law, a corporation is generally considered to be a tax resident in the jurisdiction of its organization or incorporation. Therefore, a corporation organized under the laws of the Netherlands would generally be treated as a non-U.S. corporation (and, therefore, not a U.S. tax resident) for U.S. federal income tax purposes. Section 7874 of the Code and the Treasury Regulations promulgated thereunder, however, contain rules that may cause a non-U.S. corporation that acquires the stock of a U.S. corporation to be treated as a U.S. corporation for U.S. federal income tax purposes under certain circumstances (an “Inverted Corporation”). If Allego N.V. were an Inverted Corporation for U.S. federal income tax purposes, among other consequences, it would generally be subject to U.S. federal income tax on its worldwide income, and its dividends, if any, would be subject to taxation by the United States as dividends from a U.S. corporation. Regardless of the application of Section 7874 of the Code, Allego N.V. is expected to be treated as a Dutch tax resident for Dutch tax purposes. Consequently, if Allego N.V. were an Inverted Corporation for U.S. federal income tax purposes under Section 7874 of the Code, it could be liable for both U.S. and Dutch taxes and dividends paid by Allego to its shareholders could be subject to both U.S. and Dutch withholding taxes.

In addition, even if Allego N.V. is not an Inverted Corporation pursuant to Section 7874 of the Code, it may be subject to unfavorable treatment as a “surrogate foreign corporation” (within the meaning of Section 7874(a)(2)(B) of the Code) under certain circumstances (a “Surrogate Foreign Corporation”). If it were determined that Allego N.V. is a Surrogate Foreign Corporation for U.S. federal income tax purposes under Section 7874 of the Code and the Treasury Regulations promulgated thereunder, dividends, if any, made by Allego N.V. would not qualify for “qualified dividend income” treatment, and U.S. affiliates of Allego N.V. after the completion of the Business Combination, if any, could be subject to increased taxation under Sections 7874 and 59A of the Code.

Allego N.V. does not expect to be an Inverted Corporation or Surrogate Foreign Corporation for U.S. federal income tax purposes, and Allego N.V. intends to take this position on its tax returns. Allego N.V. has not sought and will not seek any rulings from the IRS as to such tax treatment, and the Closing is not conditioned upon achieving, or receiving a ruling from any tax authority or opinion from any tax advisor in regards to, any particular tax treatment. Further, there can be no assurance that your tax advisor, Allego N.V.’s tax advisors, the IRS, or a court will agree with the position that Allego N.V. is not an Inverted Corporation or Surrogate Foreign Corporation pursuant to Section 7874 of the Code. Allego N.V. is not representing to you that Allego N.V. will not be treated as an Inverted Corporation or Surrogate Foreign Corporation for U.S. federal income tax purposes under Section 7874 of the Code. The rules for determining whether a non-U.S. corporation is an Inverted Corporation or Surrogate Foreign Corporation for U.S. federal income tax purposes are complex, unclear, and the subject of ongoing regulatory change. Allego N.V.’s intended position is not free from doubt. Further, the application of such rules must be finally determined after completion of the Business Combination, by which

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time there could be adverse changes to the relevant facts, law, and other circumstances. For example, President Biden’s Made in America tax plan, if enacted, could increase the risk that Allego N.V. would be an Inverted Corporation or Surrogate Foreign Corporation by expanding the scope of such rules to capture more transactions. For more information about the application of Section 7874 of the Code to the Business Combination, see the section entitled “Material U.S. Federal Income Tax Considerations — Material U.S. Federal Income Tax Considerations with Respect to the Spartan Merger for Holders of Spartan Class A Common Stock and Spartan Warrants — Tax Residence of Allego for U.S. Federal Income Tax Purposes.”

If Allego were a passive foreign investment company (“PFIC”) for U.S. federal income tax purposes, U.S. Holders of Allego Ordinary Shares or Assumed Warrants could be subject to adverse U.S. federal income tax consequences.

If Allego is treated as a PFIC within the meaning of Section 1297 of the Code for any taxable year during which a U.S. Holder (as defined in the section entitled “Material U.S. Federal Income Tax Considerations”) holds Allego Ordinary Shares or Assumed Warrants (regardless of whether Allego remains a PFIC for subsequent taxable years), certain adverse U.S. federal income tax consequences, such as taxation at the highest marginal ordinary income tax rates on capital gains and on certain actual or deemed distributions, and interest charges on certain taxes treated as deferred, and additional reporting requirements may apply to such U.S. Holder. Under certain circumstances, certain elections may be available to U.S. Holders of Allego Ordinary Shares to mitigate some of the adverse tax consequences resulting from PFIC treatment, but U.S. Holders will not be able to make similar elections with respect to the Assumed Warrants.

PFIC status depends on the composition of a company’s income and assets and the fair market value of its assets from time to time, as well as on the application of complex statutory and regulatory rules that are subject to potentially varying or changing interpretations. Based on the projected composition of Allego’s income and assets, including goodwill, Allego expects to take the position that it is not a PFIC for the taxable year of the Business Combination, but such position will not be free from doubt. Allego’s PFIC status for the taxable year of the Business Combination or any subsequent taxable year will not be determinable until after the end of each such taxable year, and Allego cannot assure you that it will not be a PFIC in the taxable year of the Business Combination or in any future taxable year. If Allego were later determined to be a PFIC, you may be unable to make certain advantageous elections with respect to your ownership of Allego Securities that would mitigate the adverse consequences of Allego’s PFIC status, or making such elections retroactively could have adverse tax consequences to you. Allego is not representing to you, and there can be no assurance, that Allego will not be treated as a PFIC for the taxable year of the Business Combination or in any future taxable year. Allego has not sought and will not seek any rulings from the IRS or any opinion from any tax advisor as to such tax treatment, and the closing of the Business Combination is not conditioned upon achieving, or receiving a ruling from any tax authority or opinion from any tax advisors in regards to, any particular tax treatment. U.S. Holders should consult with, and rely solely upon, their tax advisors to determine the application of the PFIC rules to them and any resultant tax consequences.

For more information about the tax considerations with respect to PFIC classification to Holders, see the section entitled “— Material U.S. Federal Income Tax Considerations for Holders with Respect to the Ownership and Disposition of Allego Ordinary Shares or Assumed Warrants — Considerations for U.S. Holders — Passive Foreign Investment Company Rules.”

The issuance of additional capital stock in connection with financings, acquisitions, investments, our stock incentive plan, contributions from Madeleine or otherwise by the post-combination company could dilute the ownership and voting power of post-combination company stockholders.

After completion of the Business Combination, the post-combination company will have 311,811,210 Allego Ordinary Shares authorized but unissued (assuming no redemptions by public stockholders of public shares and the other assumptions underlying the Redemption Scenario). All Allego Ordinary Shares issuable to

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Madeleine and E8 Investor in the Business Combination, and all Allego Ordinary Shares issuable in the Private Placement, will be issued at a price of $10.00 per share, equivalent to the $10.00 per unit price paid by investors in Spartan’s initial public offering. However, because the number of Allego Ordinary Shares issuable to Madeleine and E8 Investor in the Business Combination is largely based on the agreed valuation of Allego fixed at the time of signing of the Business Combination Agreement, if the value of Allego were to fluctuate downward prior to the closing of the Business Combination, it could further dilute other stockholders in the post-closing company.

In addition, Allego may need to raise additional financing through loans, securities offerings or additional investments in order to fund its ongoing operations. If Allego chooses to raise additional financing through the issuance of Allego Ordinary Shares, such additional Allego Ordinary Shares or such other securities may be issued at a discount to the market price of Allego Ordinary Shares at the time of issuance. Any issuance of such securities could result in substantial dilution to the post-closing company’s then existing stockholders and cause the market price of Allego Ordinary Shares to decline.

The Allego Articles include exclusive jurisdiction and forum selection provisions, which may impact the ability of shareholders to bring actions against us or increase the costs of bringing such actions.

The Allego Articles include exclusive jurisdiction and forum selection provisions, which may impact the ability of shareholders to bring actions against Allego or increase the costs of bringing such actions. The Allego Articles provide that, to the fullest extent permitted by applicable law, and unless Allego consents to the selection of an alternative forum, with respect to any complaint asserting a cause of action arising under the Securities Act or the Exchange Act, the federal courts of the United States will be the exclusive forum for resolving any such complaint. These limitations on the forum in which shareholders may initiate action against us may limit a shareholder’s ability to bring a claim in a judicial forum that it finds favorable and could increase the costs and inconvenience of pursuing claims or otherwise adversely affect a shareholder’s ability to seek monetary or other relief. There is uncertainty as to whether a court would enforce such provisions with respect to the Securities Act or the Exchange Act and the rules and regulations thereunder and a court could decline to enforce these exclusive jurisdiction and forum provisions with respect to such claims. Furthermore, investors are not able to waive compliance with federal securities laws and the rules and regulations thereunder. If a court were to find these provisions to be inapplicable or unenforceable in an action, we may incur additional costs associated with resolving such action in other jurisdictions.

Financial and Accounting-Related Risks

Allego’s financial condition and results of operations are likely to fluctuate on a quarterly basis in future periods, which could cause its results for a particular period to fall below expectations, resulting in a decline in the price of the post-combination company’s common stock.

Allego’s financial condition and results of operations have fluctuated in the past and may continue to fluctuate in the future due to a variety of factors, many of which are beyond its control.

In addition to the other risks described herein, the following factors could also cause Allego’s financial condition and results of operations to fluctuate on a quarterly basis:

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Fluctuations in operating results and cash flow could, among other things, give rise to short-term liquidity issues. In addition, revenue, and other operating results in future quarters may fall short of the expectations of investors and financial analysts, which could have an adverse effect on the price of the common stock.

Changes to applicable tax laws and regulations or exposure to additional tax liabilities could adversely affect Allego’s business and future profitability.

After the Business Combination, Allego will conduct operations, directly and through its subsidiaries, within the European Union and the United Kingdom, and Allego and its subsidiaries will therefore be subject to income taxes in such jurisdictions. Allego may also in the future become subject to income taxes in other foreign jurisdictions. Allego’s effective income tax rate could be adversely affected by a number of factors, including changes in the valuation of deferred tax assets and liabilities, changes in tax laws, changes in accounting and tax standards or practices, changes in the composition of operating income by tax jurisdiction, changes in Allego’s operating results before taxes, and the outcome of income tax audits in the jurisdictions in which it operates. Allego will regularly assesses all of these matters to determine the adequacy of its tax liabilities. If any of Allego’s assessments are ultimately determined to be incorrect, Allego’s business, results of operations, or financial condition could be materially adversely affected.

Due to the complexity of multinational tax obligations and filings, Allego and its subsidiaries may have a heightened risk related to audits or examinations by federal, state, provincial, and local taxing authorities in the jurisdictions in which it operates. Outcomes from these audits or examinations could have a material adverse effect on Allego’s business, results of operations, or financial condition.

The tax laws of the jurisdictions in which Allego operates, as well as potentially any other jurisdiction in which Allego may operate in the future, have detailed transfer pricing rules that require that all transactions with related parties satisfy arm’s length pricing principles. Although Allego believes that its transfer pricing policies have been reasonably determined in accordance with arm’s length principles, the taxation authorities in the jurisdictions where Allego carries on business could challenge its transfer pricing policies. International transfer pricing is a subjective area of taxation and generally involves a significant degree of judgment. If any of these taxation authorities were to successfully challenge Allego’s transfer pricing policies, Allego could be subject to additional income tax expenses, including interest and penalties, as well as transfer pricing mismatches. Any such increase in Allego’s income tax expense and related interest and penalties could have a material adverse effect on its business, results of operations, or financial condition.

Allego may also be adversely affected by changes in the relevant tax laws and tax rates, treaties, regulations, administrative practices and principles, judicial decisions, and interpretations thereof, in each case, possibly with retroactive effect.

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As a result of Allego’s plans to expand operations, including to jurisdictions in which the tax laws may not be favorable, Allego’s effective tax rate may fluctuate, tax obligations may become significantly more complex and subject to greater risk of examination by taxing authorities or Allego may be subject to future changes in tax laws, in each case, the impacts of which could adversely affect Allego’s after-tax profitability and financial results.

In the event that Allego expands Allego Holding’s operating business in the European Union or the United Kingdom, or to other jurisdictions, Allego’s effective tax rates may fluctuate widely in the future. Future effective tax rates could be affected by: operating losses in jurisdictions where no tax benefit can be recorded under IFRS, changes in deferred tax assets and liabilities, changes in tax laws or the regulatory environment, changes in accounting and tax standards or practices, changes in the composition of operating income by tax jurisdiction, and the pre-tax operating results of Allego’s business.

Additionally, after the Business Combination, Allego may be subject to significant income, withholding, and other tax obligations and may become subject to taxation in numerous additional jurisdictions with respect to income, operations and subsidiaries related to those jurisdictions. Allego’s after-tax profitability and financial results could be subject to volatility or be affected by numerous factors, including (a) the availability of tax deductions, credits, exemptions, refunds and other benefits to reduce tax liabilities, (b) changes in the valuation of deferred tax assets and liabilities, if any, (c) the expected timing and amount of the release of any tax valuation allowances, (d) the tax treatment of stock-based compensation, (e) changes in the relative amount of earnings subject to tax in the various jurisdictions, (f) the potential business expansion into, or otherwise becoming subject to tax in, additional jurisdictions, (g) changes to existing intercompany structure (and any costs related thereto) and business operations, (h) the extent of intercompany transactions and the extent to which taxing authorities in relevant jurisdictions respect those intercompany transactions, and (i) the ability to structure business operations in an efficient and competitive manner. Outcomes from audits or examinations by taxing authorities could have an adverse effect on Allego’s after-tax profitability and financial condition. Additionally, several tax authorities have increasingly focused attention on intercompany transfer pricing with respect to sales of products and services and the use of intangibles. Tax authorities could disagree with Allego’s intercompany charges, cross-jurisdictional transfer pricing or other matters and assess additional taxes. If Allego does not prevail in any such disagreements, its profitability may be affected.

Allego’s after-tax profitability and financial results may also be adversely affected by changes in relevant tax laws and tax rates, treaties, regulations, administrative practices and principles, judicial decisions and interpretations thereof, in each case, possibly with retroactive effect.

Allego’s ability to utilize net operating loss carryforwards and certain other tax attributes may be limited.

The ability of Allego to utilize net operating loss and tax loss carryforwards following the Business Combination is conditioned upon Allego’s attaining profitability and generating taxable income. Allego Holding has incurred significant net losses since inception and it is anticipated that Allego will continue to incur significant losses. Additionally, Allego’s ability to utilize net operating loss and tax loss carryforwards to offset future taxable income may be limited. In this respect, the amount and allocation of the tax losses of Allego Holding and its Dutch subsidiaries as well as the application of the Dutch change in ownership rules are currently being discussed with the Dutch Tax Authorities. Allego Holding and its Dutch subsidiaries currently form part of a fiscal unity for Dutch corporate income tax purposes headed by Opera Charging B.V. As a result of the issue of shares in the capital of Allego Holding to E8 Investor as part of the Business Combination (the E8 Share Issuance), the fiscal unity will be terminated with respect to Allego Holding and its Dutch subsidiaries. Generally, tax losses allocable to Allego Holding and its Dutch subsidiaries leaving the fiscal unity will remain with the (parent company of the) fiscal unity. These tax losses may only be allocated to Allego Holding and its Dutch subsidiaries (i) upon request, (ii) following approval of the Dutch Tax Authorities and (iii) to the extent such losses are actually allocable to Allego Holding B.V. or its Dutch subsidiaries. Until the moment the Dutch Tax Authorities have confirmed the amount and allocation of the tax losses to Allego Holding B.V. or its Dutch

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Subsidiaries and the application of the Dutch change in ownership rules, the exact amount and allocation is unclear, and if tax losses will be allocated to Allego Holding B.V. or its Dutch Subsidiaries, such losses will only be available for set off against taxable income actually realized by the relevant company going forward. As of the date hereof, the discussions with the Dutch Tax Authorities are progressing well and it is likely that Allego will receive a confirmation from the Dutch Tax Authorities prior to Closing. In particular, under Dutch corporate income tax rules applicable until December 31, 2021, tax losses can be carried back one year and carried forward six years (and with respect to tax losses incurred up to and including 2018, the carry forward period is nine years). As of January 1, 2022 an indefinite loss carry forward period applies in the Netherlands. However, both the carry forward and carry back tax loss relief will be limited to 50% of the taxable profit to the extent it exceeds EUR 1 million, calculated per financial year. As a result of transitional law, tax losses incurred in the financial years that started on or after January 1, 2013 and that are still available for carry forward as of January 1, 2022 also fall under the new scheme that entered into effect on January 1, 2022 and will therefore be indefinite.

If Allego prepares its financial statements in accordance with IFRS following the Business Combination, there may be a significant effect on its reported financial results.

The SEC permits foreign private issuers to file financial statements in accordance with IFRS as issued by the International Accounting Standards Board’s (“IASB”). As a foreign private issuer, Allego prepares its financial statements in accordance with IFRS as issued by the IASB. The application by Allego of different accounting standards, a change in the rules of IFRS as issued by the IASB, or in the SEC’s acceptance of such rules, could have a significant effect on Allego’s reported financial results. Additionally, U.S. GAAP is subject to interpretation by the Financial Accounting Standards Board, the American Institute of Certified Public Accountants, the Public Company Accounting Oversight Board, the SEC, and various bodies formed to promulgate and interpret appropriate accounting principles. IFRS are subject to change or revision by the IASB. A change in these principles or interpretations could have a significant effect on Allego’s reported financial results.

Allego will be an “emerging growth company” and it cannot be certain if the reduced disclosure requirements applicable to emerging growth companies will make the post-combination company’s common stock less attractive to investors and may make it more difficult to compare performance with other public companies.

Allego will be an emerging growth company as defined in the U.S. legislation Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), and it intends to take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not emerging growth companies, including not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act of 2002 (the “Sarbanes-Oxley Act”), reduced disclosure obligations regarding executive compensation in periodic reports and proxy statements, and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and stockholder approval of any golden parachute payments not previously approved. Investors may find the common stock less attractive because Allego will continue to rely on these exemptions. If some investors find the common stock less attractive as a result, there may be a less active trading market for their common stock, and the stock price may be more volatile.

An emerging growth company may elect to delay the adoption of new or revised accounting standards. In making this election, Section 102(b)(2) of the JOBS Act allows Allego to delay adoption of new or revised accounting standards until those standards apply to non-public business entities. As a result, the financial statements contained in this proxy statement/prospectus and those that Allego will file in the future may not be comparable to companies that comply with public business entities revised accounting standards effective dates.

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Allego will incur significant increased expenses and administrative burdens as a public company, which could have an adverse effect on its business, financial condition and results of operations.

Allego will face increased legal, accounting, administrative and other costs and expenses as a public company that it did not incur as a private company. The Sarbanes-Oxley Act, including the requirements of Section 404, as well as rules and regulations subsequently implemented by the SEC, the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 and the rules and regulations promulgated and to be promulgated thereunder, the Public Company Accounting Oversight Board and the securities exchanges, impose additional reporting and other obligations on public companies. Compliance with public company requirements will increase costs and make certain activities more time-consuming. A number of those requirements require it to carry out activities Allego has not done previously. In addition, expenses associated with SEC reporting requirements will be incurred. Furthermore, if any issues in complying with those requirements are identified (for example, if the auditors identify a significant deficiency or additional material weaknesses in the internal control over financial reporting), Allego could incur additional costs to rectify those issues, and the existence of those issues could adversely affect its reputation or investor perceptions. In addition, Allego will purchase director and officer liability insurance, which has substantial additional premiums. The additional reporting and other obligations imposed by these rules and regulations increase legal and financial compliance costs and the costs of related legal, accounting and administrative activities. Advocacy efforts by stockholders and third parties may also prompt additional changes in governance and reporting requirements, which could further increase costs.

Allego has identified material weaknesses in its internal control over financial reporting. If Allego is unable to remediate these material weaknesses, or if Allego identifies additional material weaknesses in the future or otherwise fails to maintain an effective system of internal control over financial reporting, this may result in material misstatements of Allego consolidated financial statements or cause Allego to fail to meet its periodic reporting obligations, which may have an adverse effect on the share price.

As a public company, Allego currently expects it will be required to provide management’s attestation on internal control over financial reporting in its second annual report filed with the SEC. Management may not be able to effectively and timely implement controls and procedures that adequately respond to the increased regulatory compliance and reporting requirements that will be applicable after the Business Combination. If Allego is not able to implement the additional requirements of Section 404(a) of the Sarbanes-Oxley Act in a timely manner or with adequate compliance, it may not be able to assess whether its internal control over financial reporting is effective, which may subject it to adverse regulatory consequences and could harm investor confidence.

In connection with the preparation and audit of Allego’s consolidated financial statements as of December 31, 2020, December 31, 2019 and 1 January 2019 and for the years ended December 31, 2020 and 2019 material weaknesses were identified in its internal control over financial reporting. A material weakness is a deficiency, or a combination of deficiencies, in internal control over financial reporting such that there is a reasonable possibility that a material misstatement of Allego’s annual or interim financial statements will not be prevented or detected on a timely basis.

Allego did not design or maintain an effective control environment commensurate with its financial reporting requirements. Specifically, Allego did not maintain a sufficient complement of personnel with an appropriate degree of accounting knowledge, experience and training, including supervision of external consultants, to appropriately analyze, record and disclose accounting matters commensurate with its accounting and reporting requirements.

This material weakness contributed to the following additional material weaknesses:

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The material weakness related to formal accounting policies, procedures and controls resulted in adjustments to several accounts and disclosures. The IT deficiencies did not result in a material misstatement to the consolidated financial statements, however, the deficiencies, when aggregated, could impact maintaining effective segregation of duties, as well as the effectiveness of IT-dependent controls that could result in misstatements potentially impacting all financial statement accounts and disclosures that would not be prevented or detected. Each of these material weaknesses could result in a misstatement of account balances or disclosures that would result in a material misstatement to the annual or interim consolidated financial statements that would not be prevented or detected.

Allego has begun implementing a plan to remediate these material weaknesses; however, its overall control environment is still immature and may expose it to errors, losses or fraud. These remediation measures are ongoing and include hiring additional IT, accounting and financial reporting personnel and implementing additional policies, procedures and controls. Allego currently cannot estimate when it will be able to remediate these material weaknesses and it cannot, at this time, provide an estimate of the costs it expects to incur in connection with implementing its plan to remediate this material weakness. These remediation measures may be time consuming, costly, and might place significant demands on its financial and operational resources. If Allego is unable to successfully remediate these material weaknesses or successfully rely on outside advisors with expertise in these matters to assist it in the preparation of its financial statements, the financial statements could contain material misstatements that, when discovered in the future, could cause Allego to fail to meet its future reporting obligations and cause the trading price of Allego’s Ordinary Shares to decline.

Allego’s independent registered public accounting firm is not required to formally attest to the effectiveness of its internal control over financial reporting until after it is no longer an “emerging growth company” as defined in the JOBS Act. At such time, Allego’s independent registered public accounting firm may issue a report that is adverse in the event it is not satisfied with the level at which its internal control over financial reporting is documented, designed or operating. Any failure to maintain effective disclosure controls and internal control over financial reporting could adversely affect the business and operating results after the Business Combination and could cause a decline in the trading price of Allego’s Ordinary Shares.

Risks Related to Legal Matters and Regulations

Privacy concerns and laws, or other domestic or foreign regulations, may adversely affect Allego’s business.

Transnational organizations such as the European Union, national and local governments and agencies in the countries in which Allego and its customers operate or reside have adopted, are considering adopting, or may

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adopt laws and regulations regarding the collection, use, storage, processing and disclosure of information regarding consumers and other individuals, which could impact its ability to offer services in certain jurisdictions. Laws and regulations relating to the collection, use, disclosure, security and other processing of individuals’ information can vary significantly from jurisdiction to jurisdiction and are particularly stringent in Europe. The costs of compliance with, and other burdens imposed by, laws, regulations, standards and other obligations relating to privacy, data protection and information security are significant. In addition, some companies, particularly larger enterprises, often will not contract with companies that do not meet these rigorous standards. Accordingly, the failure, or perceived inability, to comply with these laws, regulations, standards and other obligations may limit the use and adoption of Allego’s solutions, reduce overall demand, lead to regulatory investigations, litigation and significant fines, penalties or liabilities for actual or alleged noncompliance, or slow the pace at which we close sales transactions, any of which could harm its business. Moreover, if Allego or any of its employees or contractors fail or are believed to fail to adhere to appropriate practices regarding customers’ data, it may damage its reputation and brand.

Additionally, existing laws, regulations, standards and other obligations may be interpreted in new and differing manners in the future, and may be inconsistent among jurisdictions. Future laws, regulations, standards and other obligations, and changes in the interpretation of existing laws, regulations, standards and other obligations could result in increased regulation, increased costs of compliance and penalties for non-compliance, and limitations on data collection, use, disclosure and transfer for Allego and its customers.

Additionally, the EU adopted the GDPR in 2016, which became effective in May 2018. The GDPR establishes requirements applicable to the handling of personal data and imposes penalties for non-compliance of up to the greater of €20 million or 4% of worldwide revenue. The costs of compliance with, and other burdens imposed by, the GDPR may limit the use and adoption of Allego’s solutions and services and could have an adverse impact on its business. Although Allego initiated a compliance program designed to ensure GDPR compliance, Allego may remain exposed to ongoing legal risks related to GDPR and any amendments that may be made by the European Union.

Furthermore, the European Union has adopted in 2020 a European Strategy for Data that may lead to further regulation of data use. The costs of compliance with, and other burdens imposed by, these new regulations may limit the use and adoption of Allego’s solutions and services and could have an adverse impact on its business.

The costs of compliance with, and other burdens imposed by, laws and regulations relating to privacy, data protection and information security that are applicable to the businesses of customers may adversely affect ability and willingness to process, handle, store, use and transmit certain types of information, such as demographic and other personal information.

In addition to government activity, privacy advocacy groups, the technology industry and other industries have established or may establish various new, additional or different self-regulatory standards that may place additional burdens on technology companies. Customers may expect that Allego will meet voluntary certifications or adhere to other standards established by them or third parties. If Allego is unable to maintain these certifications or meet these standards, it could reduce demand for its solutions and adversely affect its business.

Spartan’s warrants are accounted for as a liability and the change in value of its warrants or any other similar derivative liabilities could have a material effect on its financial results.

On April 12, 2021, the SEC’s Acting Director of the Division of Corporation Finance and Acting Chief Accountant together issued guidance regarding the accounting and reporting considerations for warrants issued by special purpose acquisition companies entitled Staff Statement on Accounting and Reporting Considerations for Warrants Issued by Special Purpose Acquisition Companies (the “SEC Guidance”). Specifically, the SEC Guidance focused on certain settlement terms and provisions related to certain partial tender offers following a

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business combination, which terms are similar to those contained in the warrant agreement governing our warrants. As a result of the SEC Guidance, Spartan re-evaluated the accounting treatment of its public warrants and private placement warrants, and concluded that the warrants should be classified as a liability measured at fair value, with changes in fair value each period reported in earnings.

Under this accounting treatment, Spartan is required to measure the fair value of the warrants at the end of each reporting period and recognize changes in the fair value from the prior period in its operating results for the current period. As a result of the recurring fair value measurement of the public warrants and private placement warrants and any subsequent changes in fair value from a prior period, Spartan’s results of operations in its financial statements may fluctuate quarterly based on factors which are outside of its control. Due to this recurring fair value measurement, Spartan expects that it will recognize non-cash gains or losses on its warrants each reporting period and that the amount of such gains or losses could be material.

Failure to comply with anticorruption and anti-money laundering laws, including the FCPA, the European Directive (EU) 2015/849, the UK Bribery Act 2010 and similar laws associated with activities inside and outside of the United States and Europe, could subject Allego to penalties and other adverse consequences.

Allego is subject to the FCPA, the U.S. domestic bribery statute contained in 18 U.S.C. § 201, the U.S. Travel Act, the USA PATRIOT Act, the UK Bribery Act, the European Directive (EU) 2015/849 and possibly other anti-bribery and anti-money laundering laws in countries in which it conducts activities. Allego is subject to regulations and as a result, interacts with foreign officials. In connection therewith, it faces significant risks if it fails to comply with the FCPA and other anti-corruption laws that prohibit companies and their employees and third-party intermediaries from promising, authorizing, offering or providing, directly or indirectly, improper payments or benefits to foreign government officials, political parties and private-sector recipients for the purpose of obtaining or retaining business, directing business to any person or securing any advantage. Any violation of the FCPA, other applicable anti-corruption laws, and anti-money laundering laws could result in whistleblower complaints, adverse media coverage, investigations, loss of export privileges, or severe criminal or civil sanctions, which could have a materially adverse effect on Allego’s reputation, business, operating results and prospects. In addition, responding to any enforcement action may result in a significant diversion of management’s attention and resources, significant defense costs and other professional fees.

Failure to comply with laws relating to employment could subject Allego to penalties and other adverse consequences.

Allego is subject to various employment-related laws in the jurisdictions in which its employees are based. It faces risks if it fails to comply with applicable regional, federal or state wage laws. Any violation of applicable wage laws or other labor- or employment-related laws could result in complaints by current or former employees, adverse media coverage, investigations and damages or penalties which could have a materially adverse effect on Allego’s reputation, business, operating results and prospects. In addition, responding to any such proceeding may result in a significant diversion of management’s attention and resources, significant defense costs and other professional fees.

Existing and future environmental and health and safety laws and regulations could result in increased compliance costs or additional operating costs or construction costs and restrictions. Failure to comply with such laws and regulations may result in substantial fines or other limitations that may adversely impact Allego’s financial results or results of operation.

Allego and its operations, as well as those of Allego’s contractors, suppliers and customers, are subject to certain environmental laws and regulations, including laws related to the use, handling, storage, transportation and disposal of wastes including electronic wastes and hardware, whether hazardous or not. These laws may require Allego or others in Allego’s value chain to obtain permits and comply with procedures that impose

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various restrictions and obligations that could materially affect Allego’s operations. If key permits and approvals cannot be obtained on acceptable terms, or if other operational requirements cannot be met in a manner satisfactory for Allego’s operations or on a timeline that meets Allego’s commercial obligations, it may adversely impact its business.

Environmental and health and safety laws and regulations can be complex and may be subject to change, such as through new requirements enacted at the supranational, national, sub-national and/or local level or new or modified regulations that may be implemented under existing law. The nature and extent of any changes in these laws, rules, regulations and permits may be unpredictable and may have material effects on Allego’s business. Future legislation and regulations or changes in existing legislation and regulations, or interpretations thereof, including those relating to hardware manufacturing, electronic waste or batteries, could cause additional expenditures, restrictions and delays in connection with Allego’s operations, the extent of which cannot be predicted.

Further, Allego currently relies on third parties to ensure compliance with certain environmental laws, including those related to the disposal of hazardous and non-hazardous wastes. Any failure to properly handle or dispose of such wastes, regardless of whether such failure is Allego’s or its contractors, may result in liability under environmental laws pursuant to which liability may be imposed without regard to fault or degree of contribution for the investigation and clean-up of contaminated sites, as well as impacts to human health and damages to natural resources. Additionally, Allego may not be able to secure contracts with third parties to continue their key supply chain and disposal services for our business, which may result in increased costs for compliance with environmental laws and regulations.

We will be a foreign private issuer and, as a result, we will not be subject to U.S. proxy rules and will be subject to Exchange Act reporting obligations that, to some extent, are more lenient and less frequent than those of a U.S. domestic public company.

Following the Closing, we will be a foreign private issuer and, as a result, we will not be subject to U.S. proxy rules and will be subject to Exchange Act reporting obligations that, to some extent, are more lenient and less frequent than those of a U.S. domestic public company. Because we qualify as a foreign private issuer under the Exchange Act, we are exempt from certain provisions of the Exchange Act that are applicable to U.S. domestic public companies, including (i) the sections of the Exchange Act regulating the solicitation of proxies, consents or authorizations in respect of a security registered under the Exchange Act, (ii) the sections of the Exchange Act requiring insiders to file public reports of their share ownership and trading activities and liability for insiders who profit from trades made in a short period of time and (iii) the rules under the Exchange Act requiring the filing with the SEC of quarterly reports on Form 10-Q containing unaudited financial and other specified information. In addition, foreign private issuers are not required to file their annual report on Form 20-F until 120 days after the end of each fiscal year, while U.S. domestic issuers that are accelerated filers are required to file their annual report on Form 10-K within 75 days after the end of each fiscal year and U.S. domestic issuers that are large accelerated filers are required to file their annual report on Form 10-K within 60 days after the end of each fiscal year. Foreign private issuers are also exempt from Regulation FD, which is intended to prevent issuers from making selective disclosures of material information. As a result of all of the above, you may not have the same protections afforded to shareholders of a company that is not a foreign private issuer.

We may lose our foreign private issuer status in the future, which could result in significant additional costs and expenses.

As discussed above, we are a foreign private issuer, and therefore, we are not required to comply with all of the periodic disclosure and current reporting requirements of the Exchange Act. The determination of foreign private issuer status is made annually on the last business day of an issuer’s most recently completed second fiscal quarter, and, accordingly, the next determination will be made with respect to us on June 30, 2022. In the future, we would lose our foreign private issuer status if (i) more than 50% of our outstanding voting securities are owned by U.S. residents and (ii) a majority of our directors or executive officers are U.S. citizens or

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residents, or we fail to meet additional requirements necessary to avoid loss of foreign private issuer status. If we lose our foreign private issuer status, we will be required to file with the SEC periodic reports and registration statements on U.S. domestic issuer forms, which are more detailed and extensive than the forms available to a foreign private issuer. We will also have to mandatorily comply with U.S. federal proxy requirements, and our officers, directors and principal shareholders will become subject to the short-swing profit disclosure and recovery provisions of Section 16 of the Exchange Act. In addition, we will lose our ability to rely upon exemptions from certain corporate governance requirements under the listing rules of NYSE. As a U.S. listed public company that is not a foreign private issuer, we will incur significant additional legal, accounting and other expenses that we will not incur as a foreign private issuer, and accounting, reporting and other expenses in order to maintain a listing on a U.S. securities exchange. These expenses will relate to, among other things, the obligation to present our financial information in accordance with U.S. GAAP in the future.

As we are a “foreign private issuer” and intend to follow certain home country corporate governance practices, our shareholders may not have the same protections afforded to shareholders of companies that are subject to all NYSE governance requirements.

As a foreign private issuer, we have the option to follow certain home country corporate governance practices rather than those of NYSE, provided that we disclose the requirements we are not following and describe the home country practices we are following. We intend to rely on this “foreign private issuer exemption” with respect to the NYSE requirements with respect to shareholder meeting quorums, shareholder approval and certain board, committee and director independence requirements. We may in the future elect to follow home country practices with regard to other matters. As a result, our shareholders may not have the same protections afforded to shareholders of companies that are subject to all NYSE corporate governance requirements.

The JOBS Act permits “emerging growth companies” like us to take advantage of certain exemptions from various reporting requirements applicable to other public companies that are not emerging growth companies.

We qualify as an “emerging growth company” as defined in Section 2(a)(19) of the Securities Act, as modified by the JOBS Act. As such, we take advantage of certain exemptions from various reporting requirements applicable to other public companies that are not emerging growth companies, including (a) the exemption from the auditor attestation requirements with respect to internal control over financial reporting under Section 404 of the Sarbanes-Oxley Act, (b) the exemptions from say-on-pay, say-on-frequency and say-on-golden parachute voting requirements and (c) reduced disclosure obligations regarding executive compensation in our periodic reports and proxy statements. As a result, our shareholders may not have access to certain information they deem important. We will remain an emerging growth company until the earliest of (a) the last day of the fiscal year (i) following February 11, 2025, the fifth anniversary of our IPO, (ii) in which we have total annual gross revenue of at least $1.07 billion (as adjusted for inflation pursuant to SEC rules from time to time) or (iii) in which we are deemed to be a large accelerated filer, which means the market value of our Ordinary Shares that is held by non-affiliates exceeds $700 million as of the last business day of our prior second fiscal quarter, and (b) the date on which we have issued more than $1.0 billion in non-convertible debt during the prior three year period.

In addition, Section 107 of the JOBS Act provides that an emerging growth company can take advantage of the exemption from complying with new or revised accounting standards provided in Section 7(a)(2)(B) of the Securities Act as long as we are an emerging growth company. An emerging growth company can therefore delay the adoption of certain accounting standards until those standards would otherwise apply to private companies. The JOBS Act provides that a company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies, but any such election to opt out is irrevocable. We have elected not to opt out of such extended transition period, which means that when a standard is issued or revised and it has different application dates for public or private companies, we, as an emerging growth company, can adopt the new or revised standard at the time private companies adopt the new or revised standard. This may make comparison of our financial statements with another public company which is neither

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an emerging growth company nor an emerging growth company which has opted out of using the extended transition period difficult or impossible because of the potential differences in accounting standards used.

We cannot predict if investors will find our Ordinary Shares less attractive because we will rely on these exemptions. If some investors find our Ordinary Shares less attractive as a result, there may be a less active trading market for our Ordinary Shares and our stock price may be more volatile.

The exclusive forum clause set forth in the Warrant Agreement may have the effect of limiting an investor’s rights to bring legal action against Spartan or Allego and could limit the investor’s ability to obtain a favorable judicial forum for disputes with us.

The Warrant Agreement provides that (i) any action, proceeding or claim against Spartan (or, following the consummation of the Business Combination and the execution of the Warrant Assumption Agreement, Allego) arising out of or relating in any way to the Warrant Agreement will be brought and enforced in the courts of the State of New York or the United States District Court for the Southern District of New York and (ii) Spartan and, following the execution of the Warrant Assumption Agreement, Allego irrevocably submit to such jurisdiction, which jurisdiction will be exclusive. Allego and Spartan have waived or will waive any objection to such exclusive jurisdiction or that such courts represent an inconvenient forum. We note, however, that there is uncertainty as to whether a court would enforce these provisions and that investors cannot waive compliance with the federal securities laws and the rules and regulations thereunder. Section 22 of the Securities Act creates concurrent jurisdiction for state and federal courts over all suits brought to enforce any duty or liability created by the Securities Act or the rules and regulations thereunder.

Notwithstanding the foregoing, these provisions of the Warrant Agreement will not apply to suits brought to enforce any liability or duty created by the Exchange Act or any other claim for which the federal district courts of the United States of America are the sole and exclusive forum. Section 27 of the Exchange Act creates exclusive federal jurisdiction over all suits brought to enforce any duty or liability created by the Exchange Act or the rules and regulations thereunder. Any person or entity purchasing or otherwise acquiring any interest in any of the Spartan Warrants or Assumed Warrants shall be deemed to have notice of and to have consented to the forum provisions in the Warrant Agreement. If any action, the subject matter of which is within the scope of the forum provisions of the Warrant Agreement, is filed in a court other than a court of the State of New York or the United States District Court for the Southern District of New York (a “foreign action”) in the name of any holder of the Spartan Warrants or Assumed Warrants, such holder shall be deemed to have consented to: (x) the personal jurisdiction of the state and federal courts located in the State of New York in connection with any action brought in any such court to enforce the forum provisions (an “enforcement action”), and (y) having service of process made upon such warrant holder in any such enforcement action by service upon such warrant holder’s counsel in the foreign action as agent for such warrant holder.

This choice-of-forum provision may limit a warrant holder’s ability to bring a claim in a judicial forum that it finds favorable for disputes with Spartan or Allego, which may discourage such lawsuits. Alternatively, if a court were to find this provision of the Warrant Agreement inapplicable or unenforceable with respect to one or more of the specified types of actions or proceedings, we may incur additional costs associated with resolving such matters in other jurisdictions, which could materially and adversely affect our business, financial condition and results of operations and result in a diversion of the time and resources of our management and board of directors.

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Risks Related to Spartan and the Business Combination

Spartan is a company with little operating history, and you have no basis on which to evaluate its ability to successfully consummate the Business Combination.

Spartan is a company with limited operating history, formed for the purpose of completing an initial business combination. As such, you have no basis upon which to evaluate its ability to complete the Business Combination, and it may be unable to do so.

Past performance by members of Spartan’s management team may not be indicative of an ability to complete a business combination or of future performance of an investment in Allego.

Past acquisition and operational experience of Spartan’s management team and their affiliates is not a guarantee of Spartan’s ability to complete the Business Combination nor, if consummated, a guarantee that the intended benefits of the Business Combination will be achieved. No members of the Spartan management team are expected to continue as part of the Allego executive management team following the Business Combination. You should not rely on the historical record of Spartan’s management team or their affiliates’ performance as indicative of the future performance of Allego or of an investment in Allego Ordinary Shares.

Spartan’s assessment of the capabilities of Allego’s management to continue Allego’s growth transition may prove to be incorrect, which could negatively impact the value of the continuing investment of Spartan Stockholders.

The individuals who constitute Allego’s senior management team have limited experience managing a publicly traded company and limited experience complying with the increasingly complex regulatory environment pertaining to public companies. If Spartan’s assessment of the capabilities of Allego’s management to successfully execute upon Allego’s growth strategy, transition to management of a public company, and continue to attract qualified personnel proves to be incorrect, the operations and profitability of the post-combination business and the value of the continued investment of Spartan Stockholders may be negatively impacted.

Spartan’s initial stockholders have agreed to vote in favor of the Business Combination, regardless of how Spartan’s public stockholders vote.

Unlike many other blank check companies in which the founders agree to vote their founder shares in accordance with the majority of the votes cast by the blank check company’s public stockholders in connection with an initial business combination, Spartan’s founders have agreed to vote any shares of Spartan Class A Common Stock and Spartan Founders Stock held by them in favor of the Business Combination. As of the date hereof, Spartan’s initial stockholders own shares equal to approximately 20% of its issued and outstanding shares of Spartan Class A Common Stock and Spartan Founders Stock in the aggregate. Accordingly, it is more likely that the necessary stockholder approval will be received for the Business Combination than would be the case if the Sponsor and other holders of the Founder Shares agreed to vote any shares of Spartan Class A Common Stock and Spartan Founders Stock held by them in accordance with the majority of the votes cast by Spartan’s public stockholders.

The Sponsor, certain members of the Spartan Board and its officers have interests in the Business Combination that are different from or are in addition to other stockholders in recommending that stockholders vote in favor of approval of the Business Combination.

When considering the Spartan Board’s recommendation that the Spartan public stockholders vote in favor of the approval of the Business Combination Proposal, our stockholders should be aware that the Sponsor and Spartan’s directors and officers have interests in the Business Combination that may be different from, or in addition to, the interests of its other stockholders. These interests include:

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The Spartan Board was aware of and considered these interests, among other matters, in reaching the determination to approve the Business Combination and the Business Combination Agreement and in recommending that the holders of Spartan’s Common Stock vote to approve the Business Combination Proposal and adopt the Business Combination Agreement. For additional information please see the subsection entitled “The Business Combination — Interests of Certain Persons in the Business Combination — Interests of Sponsor and Spartan Directors and Officers.”

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The Sponsor and Spartan’s independent directors hold a significant number of shares of its Common Stock and the Sponsor holds a significant number of its warrants. They will lose their entire investment in Spartan if it does not complete an Initial Business Combination.

The Sponsor and Spartan’s independent directors hold all of the Founder Shares, representing 20% of the total outstanding shares upon completion of the IPO. The Founder Shares will be worthless if Spartan does not complete an Initial Business Combination by the Deadline Date. In addition, the Sponsor holds an aggregate of 9,360,000 private placement warrants that will also be worthless if Spartan does not complete an Initial Business Combination by the Deadline Date.

The Founder Shares are identical to the shares of Spartan Class A Common Stock included in the units, except that (a) only holders of the Founder Shares have the right to vote on the appointment of directors prior to Spartan’s Initial Business Combination, (b) the Founder Shares and the shares of Spartan Class A Common Stock into which the Founder Shares convert upon an Initial Business Combination are subject to certain transfer restrictions, (c) the Sponsor, officers and directors have entered into the Letter Agreement with Spartan, pursuant to which they have agreed to waive (i) their Redemption Rights with respect to their Founder Shares and public shares owned in connection with the completion of an Initial Business Combination and (ii) their rights to liquidating distributions from the Trust Account with respect to their Founder Shares if Spartan fails to complete an Initial Business Combination by the Deadline Date (although they will be entitled to liquidating distributions from the Trust Account with respect to any public shares they hold if Spartan fails to complete an Initial Business Combination by the Deadline Date) and (d) the Founder Shares will automatically convert into shares of Spartan Class A Common Stock at the time of an Initial Business Combination. Under the Charter, holders of Founder Shares have anti-dilution protection, but pursuant to the Charter they waived their right to anti-dilution of any Equity-linked Securities (as defined therein) issued in an Initial Business Combination.

The personal and financial interests of the Sponsor and Spartan’s officers and directors may influence their motivation in identifying, selecting and completing the Business Combination.

Spartan and/or Allego may waive one or more of the conditions to the Business Combination.

Spartan may agree to waive, in whole or in part, one or more of the conditions to its obligations to complete the Business Combination, to the extent permitted by the Charter, bylaws and applicable laws. For example, it is a condition to Spartan’s obligation to close the Business Combination that certain of Allego’s representations and warranties be true and correct in all material respects as of the date of the Business Combination Agreement and the Effective Time (as defined therein). However, if the Spartan Board determines that it is in the best interests of Spartan to proceed with the Business Combination, then the Spartan Board may elect to waive that condition and close the Business Combination. Similarly, Allego could elect to waive, in whole or in part, one or more of the conditions to its obligations to complete the Business Combination, to the extent permitted by its articles of association and applicable laws. For additional information, please see the subsection entitled “The Business Combination — Conditions to the Closing.”

The consummation of the Business Combination is subject to a number of conditions and if those conditions are not satisfied or waived, the Business Combination Agreement may be terminated in accordance with its terms and the Business Combination may not be completed.

The Business Combination Agreement is subject to a number of conditions which must be fulfilled in order to complete the Business Combination. Those conditions include, among other things: (a) approval by Spartan Stockholders, (b) approval of the Allego Ordinary Shares for listing on the NYSE, or another national securities exchange mutually agreed to by the parties to the Business Combination Agreement, as of the Closing Date, (c) the completion of any applicable information consultation or approval procedure under the Dutch Works Councils Act to consummate the Transactions in accordance with the Dutch Works Councils Act, (d) Spartan having at least $5,000,001 of net tangible assets following the exercise of redemption rights in accordance with

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the organizational documents of Spartan or Allego Ordinary Shares will not constitute “penny stock” as such term is defined in Rule 3a51-1 of the Exchange Act and (e) this Registration Statement having been declared effective by the SEC under the Securities Act. In addition, the parties can mutually decide to terminate the Business Combination Agreement at any time, before or after stockholder approval, or Spartan or Allego may elect to terminate the Business Combination Agreement in certain other circumstances. For additional information please see the subsections entitled “The Business Combination — Conditions to Closing” and “The Business Combination — Termination.”

Legal proceedings in connection with the Business Combination, the outcomes of which are uncertain, could delay or prevent the completion of the Business Combination.

Lawsuits may be filed against Spartan or its directors and officers in connection with the Business Combination. Defending such lawsuits could require Spartan to incur significant costs and draw the attention of its management team away from the Business Combination. Further, the defense or settlement of any lawsuit or claim that remains unresolved at the time the Business Combination is consummated may adversely affect Allego’s business, financial condition, results of operations and cash flows. Such legal proceedings could delay or prevent the Business Combination from becoming effective within the contemplated timeframe.

If Spartan is unable to complete an Initial Business Combination by the Deadline Date, its public stockholders may receive only approximately $10.00 per share on the liquidation of the Trust Account (or less than $10.00 per share in certain circumstances where a third party brings a claim against Spartan that the Sponsor is unable to indemnify), and the Spartan Warrants will expire worthless.

If Spartan is unable to complete an Initial Business Combination by the Deadline Date, its public stockholders may receive only approximately $10.00 per share on the liquidation of the Trust Account (or less than $10.00 per share in certain circumstances where a third party brings a claim against Spartan that the Sponsor is unable to indemnify), and the Spartan Warrants will expire worthless.

Spartan’s due diligence investigation of Allego and factors affecting its business may not surface all material issues, including issues or circumstances that could have a significant negative effect on Allego’s financial condition, results of operations and stock price, which could cause Spartan Stockholders to lose some or all of their continuing investment.

Spartan cannot guarantee that its extensive due diligence investigation of Allego has or will surface all issues that may be material to an investment in Allego. Allego is a private company that has not been exposed to significant public investor scrutiny, and information that may be relevant to the Business Combination is limited. In addition, factors affecting Allego’s business that are outside of the control of Allego and Spartan may later arise, and risks identified by Spartan may materialize in a manner or to an extent that diverges from Spartan’s expectations. Such factors may include those that would negatively impact Allego’s liquidity, or require that Allego write-down or write-off assets, restructure operations, or incur impairment or other charges that could result in reported losses. Charges of this nature could contribute to negative market perception about Allego or its securities and could cause Allego to violate net worth or other debt financing or similar covenants to which it may be subject. In such an event, the continued investment of Spartan Stockholders may be negatively impacted.

Even if Spartan consummates the Business Combination, there is no guarantee that the public warrants will be in the money at the time they become exercisable, and they may expire worthless.

The exercise price for the Spartan Warrants is $11.50 per share of Spartan Class A Common Stock. There is no guarantee that the public warrants will be in the money following the time they become exercisable and prior to their expiration, and as such, the warrants may expire worthless.

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Following the Business Combination, if securities or industry analysts do not publish or cease publishing research or reports about Allego, its business or its market, or if they change their recommendations regarding the Ordinary Shares adversely, the price and trading volume of its Ordinary Shares could decline.

The trading market for the Ordinary Shares will be influenced by the research and reports that industry or securities analysts may publish about Allego, its business, its market or its competitors. If any of the analysts who may cover Allego following the Business Combination change their recommendation regarding Allego’s stock adversely, or provide more favorable relative recommendations about its competitors, the price of Allego’s Ordinary Shares would likely decline. If any analyst who may cover Allego following the Business Combination were to cease its coverage or fail to regularly publish reports on Allego, it could reduce Allego’s visibility in the financial markets, which could cause its stock price or trading volume to decline.

Changes in laws or regulations, or a failure to comply with any laws or regulations, may adversely affect our business, investments and results of operations.

Spartan is subject to laws and regulations enacted by national, regional and local governments. In particular, Spartan is required to comply with certain SEC and other legal requirements. Compliance with, and monitoring of, applicable laws and regulations may be difficult, time consuming and costly. Those laws and regulations and their interpretation and application may also change from time to time and those changes could have a material adverse effect on Spartan’s business, investments and results of operations. In addition, a failure to comply with applicable laws or regulations, as interpreted and applied, could have a material adverse effect on Spartan’s business, including its ability to negotiate and complete the Business Combination, and results of operations.

Spartan Warrants will automatically be converted into Assumed Warrants upon the completion of the Business Combination and Allego will continue to have the right to redeem the public warrants prior to their exercise, including at times that may be disadvantageous to holders of such securities.

Pursuant to the existing terms of the public warrants, Allego will have the right, following the automatic conversion of the public warrants into Assumed Warrants upon the completion of the Business Combination, to redeem outstanding public warrants at any time after they become exercisable and prior to their expiration, at a price of (i) $0.01 per Public Warrant, provided that the last reported sales price of Allego Ordinary Shares equals or exceeds $18.00 per share (as adjusted for stock splits, stock dividends, reorganizations, recapitalizations and the like and for certain issuances of common stock and equity-linked securities) for any 20 trading days within a 30 trading-day period commencing once the public warrants become exercisable and ending on the third trading day prior to the date on which Allego gives proper notice of such redemption and provided certain other conditions are met or (ii) (A) $0.10 per Public Warrant, provided that the last reported sales price of Allego Ordinary Shares equals or exceeds $10.00 per share (as adjusted for stock splits, stock dividends, reorganizations, recapitalizations and the like and for certain issuances of common stock and equity-linked securities) on the trading day prior to the date on which notice of the redemption is given or (B) on a “cashless basis,” provided that the last reported sales price of Allego Ordinary Shares equals or exceeds $10.00 per share (as adjusted for stock splits, stock dividends, reorganizations, recapitalizations and the like and for certain issuances of common stock and equity-linked securities), whereby the holder will receive a number of Allego Ordinary Shares based on the redemption date and pursuant to the terms of the Warrant Agreement. If and when the public warrants become redeemable, Allego may exercise its redemption right even if it is unable to register or qualify the underlying securities for sale under all applicable state securities laws.

Redemption of the outstanding public warrants could force the holders of such public warrants (i) to exercise their public warrants and pay the exercise price therefor at a time when it may be disadvantageous for them to do so, (ii) to sell their public warrants at the then-current market price when they might otherwise wish to hold their public warrants or (iii) to accept the nominal redemption price, which, at the time the outstanding warrants are called for redemption, is likely to be substantially less than the market value of such warrants. None of Spartan’s private placement warrants will be redeemable by Allego so long as they are held by the Sponsor or its permitted transferees.

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Spartan does not have a specified maximum redemption threshold. The absence of such a redemption threshold may make it possible for it to complete the Business Combination even if a substantial majority of its stockholders do not agree.

Spartan’s Charter does not provide a specified maximum redemption threshold, except that in no event will Spartan redeem its public shares in an amount that would cause its net tangible assets to be less than $5,000,001 (such that it is not subject to the SEC’s “penny stock” rules). As a result, Spartan may be able to complete the Business Combination even though a substantial majority of its public stockholders do not agree with the transaction and have redeemed their shares. In the event the aggregate cash consideration Spartan would be required to pay for all shares of Spartan Class A Common Stock that are validly submitted for redemption plus any amount required to satisfy cash conditions pursuant to the terms of the proposed Business Combination exceeds the aggregate amount of cash available to Spartan, it will not complete the Business Combination or redeem any shares, all shares of Spartan Class A Common Stock submitted for redemption will be returned to the holders thereof, and Spartan instead may search for an alternate Business Combination.

Spartan Stockholders will have reduced ownership and voting interests after the consummation of the Business Combination and will exercise less influence over management.

Following the consummation of the Business Combination and the Private Placement, current public stockholders of Spartan public shares would own approximately 18% of Allego (assuming that no public stockholders elect to have their public shares redeemed and that none of the Spartan Warrants are exercised). The position of current public stockholders will give them limited influence over management.

The Business Combination, Spartan and Allego may be materially adversely affected by the COVID-19 pandemic.

In addition to the risks described above under “Allego faces risks related to health pandemics, including the COVID-19 pandemic, which could have a material adverse effect on its business and results of operations,” Spartan’s ability to consummate the Business Combination may be materially adversely affected due to significant governmental measures being implemented to contain the outbreak of the COVID-19 pandemic or its impact, including travel restrictions, the shutdown of businesses and quarantines, among others, which may limit Spartan’s ability to have meetings with potential investors or affect the ability of Spartan’s and Allego’s personnel, contractors and capital providers to negotiate and consummate the Business Combination in a timely manner. The extent to which the COVID-19 pandemic impacts the Business Combination, Spartan or Allego will depend on future developments, which are highly uncertain and cannot be predicted, including new information which may emerge concerning the severity of the COVID-19 pandemic and new variants thereof, the administration of vaccines and the effectiveness thereof and the actions to contain the COVID-19 pandemic or treat its impact, among others. If the disruptions posed by the COVID-19 pandemic or other matters of global concern continue for an extensive period of time, Spartan’s ability to consummate the Business Combination may be materially adversely affected. Additionally, if the financial markets or the overall economy are impacted for an extended period, Spartan and Allego’s results of operations, financial position and cash flows may be materially adversely affected.

Spartan has and will continue to incur significant transaction costs in connection with the negotiation of the Business Combination Agreement and consummation of the Business Combination.

Spartan has incurred and expects to continue to incur significant, non-recurring costs in connection with the consummation of the Business Combination. All expenses incurred in connection with the Business Combination Agreement and the transactions contemplated thereby, including all legal, accounting, consulting, investment banking and other fees, expenses and costs, will be for the account of the party incurring such fees, expenses and costs. If the Business Combination is not consummated, Spartan may not have sufficient funds to seek an alternative business combination and may be forced to voluntarily liquidate and subsequently dissolve.

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