As filed with the Securities and Exchange Commission on February 13, 2026.

Registration No. 333-292712

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

AMENDMENT NO 1 TO

FORM S-4

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

Boost Run Inc.

(Exact name of registrant as specified in its charter)

For co-registrant, see “Table of Co-Registrant” on the following page.

5 Revere Drive, Suite 200

Northbrook, IL 60062

Telephone: (847) 489-3367

(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)

Andrew Karos

5 Revere Drive, Suite 200

Northbrook, IL 60062

Telephone: (847) 489-3367

(Name, address, including zip code, and telephone number, including area code, of agent for service)

Copies to:

Approximate date of commencement of proposed sale of the securities to the public: As soon as practicable after this Registration Statement becomes effective.

If the securities being registered on this Form are being offered in connection with the formation of a holding company and there is compliance with General Instruction G, check the following box: ☐

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☐

If applicable, place an X in the box to designate the appropriate rule provision relied upon in conducting this transaction:

Exchange Act Rule 13e-4(i) (Cross-Border Issuer Tender Offer) ☐

Exchange Act Rule 14d-1(d) (Cross-Border Third-Party Tender Offer) ☐

The registrant and co-registrant hereby amend this Registration Statement on such date or dates as may be necessary to delay its effective date until the registrant and co-registrants shall file a further amendment which specifically states that this Registration Statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933, as amended, or until the Registration Statement shall become effective on such date as the Securities and Exchange Commission, acting pursuant to Section 8(a), may determine.

TABLE OF CO-REGISTRANT

(1) The co-registrant has the following principal executive offices: 5 Revere Drive, Suite 200 Northbrook, IL 60062.

(2) The agent for service for the co-registrant is: Andrew Karos.

The information in this preliminary proxy statement/prospectus is not complete and may be changed. The registrant may not sell or issue these securities offered by this preliminary proxy statement/prospectus until the registration statement filed with the Securities and Exchange Commission, of which this proxy statement/prospectus is a part, is declared effective. This preliminary proxy statement/prospectus does not constitute an offer to sell these securities and it is not soliciting an offer to buy these securities in any state or other jurisdiction where the offer or sale is not permitted.

PRELIMINARY PROXY STATEMENT/PROSPECTUS, SUBJECT TO COMPLETION,
DATED FEBRUARY 13, 2026

PROXY STATEMENT FOR EXTRAORDINARY GENERAL MEETING OF SHAREHOLDERS OF
WILLOW LANE ACQUISITION CORP.
AND
PROSPECTUS FOR UP TO 80,774,396 SHARES OF CLASS A COMMON STOCK AND 11,470,722 WARRANTS OF BOOST RUN INC.

To the Shareholders of Willow Lane Acquisition Corp.:

You are cordially invited to attend the extraordinary general meeting (the “Meeting”) of the shareholders of Willow Lane Acquisition Corp., a Cayman Islands exempted company (“Willow Lane”), which will be held at 10:00 a.m., Eastern Time, on March 3, 2026. The Meeting will be held at the offices of Ellenoff Grossman & Schole LLP at 1345 Avenue of the Americas, 11th Floor, New York, NY 10105 and virtually over the Internet by means of a live audio webcast. You or your proxyholder will be able to attend and vote at the Meeting in person or by visiting https://www.cstproxy.com/willowspac/2026 and using a control number assigned by Continental Stock Transfer & Trust Company. To register and receive access to the Meeting, registered shareholders and beneficial owners (those holding shares through a stock brokerage account or by a bank or other holder of record) will need to follow the instructions applicable to them provided in this proxy statement/prospectus. This proxy statement/prospectus includes additional instructions on how to access the Meeting and how to listen, vote and submit questions from home or any remote location with Internet connectivity.

Willow Lane is a Cayman Islands exempted company incorporated as a blank check company for the purpose of effecting a merger, amalgamation, share exchange, asset acquisition, share purchase, reorganization or similar business combination with one or more businesses or entities, which we refer to as an “acquisition target.”

On September 15, 2025, Willow Lane entered into a Business Combination Agreement, as amended on January 13, 2026 (the “Business Combination Agreement”), with Boost Run Holdings, LLC, a Delaware limited liability company (“Boost Run”), Boost Run Inc., a Delaware corporation (“Pubco”), Benchmark Merger Sub I Inc., a Delaware corporation and a wholly-owned subsidiary of Pubco (“SPAC Merger Sub”), Benchmark Merger Sub II LLC, a Delaware limited liability company and a wholly-owned subsidiary of Pubco (“Company Merger Sub” and, together with SPAC Merger Sub, the “Merger Subs”), George Peng, solely in his capacity as the representative (the “SPAC Representative”), from and after the Effective Time (as defined below), of the Willow Lane shareholders as of immediately prior to the Effective Time and their successors and assigns (other than the holders of Boost Run’s issued and outstanding membership interests (the “Sellers”)), in accordance with the terms and conditions of the Business Combination Agreement, and Andrew Karos, solely in his capacity as the representative (the “Seller Representative”), from and after the Effective Time, of the Sellers as of immediately prior to the Effective Time and their successors and assigns, in accordance with the terms and conditions of the Business Combination Agreement.

Prior to the consummation (the “Closing”) of the transactions contemplated by the Business Combination Agreement (the “Transactions” and, considered as a whole, the “Business Combination”), Willow Lane shall transfer, by way of continuation, out of the Cayman Islands and into the State of Delaware so as to re-domicile as and become a Delaware corporation. At the Closing, (i) SPAC Merger Sub shall merge with and into Willow Lane, with Willow Lane continuing as the surviving entity (the “SPAC Merger”), as a result of which the securities of Willow Lane immediately prior to the Effective Time shall no longer be outstanding and shall automatically be cancelled in exchange for the consideration described below; (ii) Company Merger Sub will merge with and into Boost Run, with Boost Run continuing as the surviving entity (the “Company Merger”, and together with the SPAC Merger, the “Mergers”), as a result of which the securities of Boost Run immediately prior to the Effective Time shall no longer be outstanding and shall automatically be cancelled in exchange for the consideration described below; and (iii) as a result of the Mergers, Willow Lane and Boost Run will become wholly-owned subsidiaries of Pubco and Pubco will become a publicly traded company. As used herein, “Effective Time” means 5:00 p.m. New York City time on the date of the Closing (or such other date and/or time as may be agreed in writing by Boost Run and Willow Lane), at which time each of the Mergers shall be consummated simultaneously by the filing of appropriate certificates of merger with the Secretary of State of the State of Delaware.

In exchange for the cancellation of the securities of Willow Lane, the holders of those securities will receive substantially equivalent securities of Pubco. In exchange for the cancellation of the securities of Boost Run, the following persons shall receive the following consideration: (i) Andrew Karos, Chief Executive Officer of Boost Run and one of the Sellers, shall receive an installment note in the initial principal amount of $8,500,000 (the “Note”) to be paid by Pubco, plus (ii) the Sellers shall receive their specified portions of an aggregate number of newly issued shares of Pubco common stock equal to $441,500,000 divided by $10.00, with the Sellers other than Mr. Karos receiving shares of Class A Common Stock, par value $0.0001 per share, of Pubco (“Pubco Class A Common Stock”) and Mr. Karos receiving shares of Class B Common Stock, par value $0.0001 per share, of Pubco (“Pubco Class B Common Stock”); plus (iii) 7,875,000 newly issued shares of Pubco Class A Common Stock (the “Karos Earnout Shares”) may be earned by Mr. Karos based on the performance of Pubco Class A Common Stock during the three-year period beginning on and following the date of the Closing (the “Earnout Period”), as follows: in the event the volume-weighted average price (“VWAP”) of the Pubco Class A Common Stock equals or exceeds the prices below for any 20 trading days within any consecutive 30 trading days during the Earnout Period, Mr. Karos shall be entitled to receive the following amounts of Karos Earnout Shares: (x) $12.50 per share – 2,625,000 Karos Earnout Shares, (y) $15.00 per share – 2,625,000 Karos Earnout Shares and (z) $17.50 per share – 2,625,000 Karos Earnout Shares.

Simultaneously with the execution of the Business Combination Agreement, each Seller entered into a seller support agreement (each, a “Seller Support Agreement”), pursuant to which, among other things, such Seller has agreed to vote its membership interests in favor of the adoption of the Business Combination Agreement, the documents ancillary thereto, the approval of the Business Combination and any amendments to Boost Run’s organizational documents in connection therewith, subject to certain customary conditions. Each Seller also agreed to take certain other actions in support of the Business Combination Agreement and the Business Combination (and any actions required in furtherance thereof) and refrain from taking actions that would adversely affect their ability to perform such Seller’s obligations under the Seller Support Agreement. Each Seller also agreed not to transfer their membership interests in Boost Run during the period from and including the date of the Seller Support Agreement to the date on which the Seller Support Agreement is terminated in accordance with its terms.

Simultaneously with the execution of the Business Combination Agreement, each Seller entered into a lock-up agreement (each, a “Lock-Up Agreement”), pursuant to which such Seller agreed not to (i) lend, offer, pledge, hypothecate, encumber, donate, assign, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, or otherwise transfer or dispose of, directly or indirectly, any shares of Pubco common stock to be received by such Seller in the Business Combination, (ii) enter into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of such Pubco common stock, or (iii) publicly disclose the intention to do any of the foregoing, for a period commencing from the Closing and ending on the date that is six (6) months after the Closing; provided, however, that the lock-up period shall not apply to 10% of each Seller’s shares of such Pubco common stock and is subject to early release on the earlier of (x) the date after the Closing on which the closing price of Pubco common stock equals or exceeds $12.00 per share for any 20 trading days within any 30-trading day period commencing after the Closing and (y) the date after the Closing on which Pubco consummates a liquidation, merger, capital stock exchange, reorganization or other similar transaction that results in all of its stockholders having the right to exchange their shares of Pubco common stock for cash, securities or other property; subject in each case to certain customary transfer exceptions.

Simultaneously with the execution of the Business Combination Agreement, Willow Lane, Pubco, Boost Run and the underwriter of the Willow Lane IPO, on the one hand, and Willow Lane Sponsor, LLC (the “Sponsor”) and Willow Lane’s directors and officers, on the other hand, entered into an amendment (each an “Insider Letter Amendment”) to the letter agreement (the “Insider Letter”) that was entered into in connection with Willow Lane’s IPO to (i) add Pubco and Boost Run as parties to the Insider Letter, (ii) revise the terms of the Insider Letter to reflect the contemplated Business Combination, including the issuance of Pubco securities in exchange for Willow Lane securities, and have Pubco assume and be assigned the rights and obligations of Willow Lane under the Insider Letter, (iii) amend the terms of the lock-up set forth in the Insider Letter to conform with the lock-up terms in the Lock-Up Agreements described above, and (iv) release from lock-up restrictions 10% of the 4,628,674 shares of Pubco common stock to be issued upon conversion of the Willow Lane Class B ordinary shares (the “Founder Shares”) pursuant to the Business Combination, subject to and contingent upon the Closing and upon approval of the Insider Letter Amendment Proposal by Willow Lane Shareholders at the Meeting.

Simultaneously with the execution of the Business Combination Agreement, Willow Lane, Pubco and Boost Run entered into a Non-Competition and Non-Solicitation Agreement with Andrew Karos in favor of Pubco and Boost Run, which agreement will be effective as of the Closing and will provide for a restricted period from the Closing until the third anniversary of the Closing Date.

Prior to the Closing, Willow Lane, Pubco, the Sponsor and the Sellers will enter into an Amended and Restated Registration Rights Agreement that will amend and restate the registration rights agreement entered into at the time of the Willow Lane IPO, pursuant to which (i) Pubco will assume the registration obligations of Willow Lane under such registration rights agreement, with such rights to apply to the Pubco securities, and (ii) the Sellers will be granted registration rights thereunder.

Simultaneously with the execution of the Business Combination Agreement, and in connection with the execution of the Transfer Agreement described below, Pubco, the Sponsor and Goodrich ILMJS LLC (the “SPV”) entered into an earnout agreement, as amended on January 13, 2026 (the “Earnout Agreement”), providing that the Sponsor may earn up to 1,125,000 newly issued shares of Pubco Class A Common Stock (the “Sponsor Earnout Shares”) and the SPV may earn up to 1,968,750 newly issued shares of Pubco Class A Common Stock (the “SPV Earnout Shares”) (or 3,093,750 shares in total) based on the performance of Pubco Class A Common Stock during the three-year period beginning on and following the Closing, as follows: in the event that the VWAP of Pubco Class A Common Stock equals or exceeds the prices set forth below for any 20 trading days within any consecutive 30 trading days during the specified earnout period, the Sponsor and the SPV shall be entitled to receive the following amounts of such shares: (i) $12.50 per share – 375,000 such shares for the Sponsor and 656,250 for the SPV; (ii) $15.00 per share – 375,000 such shares for the Sponsor and 656,250 for the SPV; and (iii) $17.50 per share – 375,000 such shares for the Sponsor and 656,250 for the SPV.

Simultaneously with the execution of the Business Combination Agreement, and in connection with the execution of the Earnout Agreement, the Sponsor and the SPV entered into a Transfer Agreement providing that the SPV shall have the right, but not the obligation, to purchase from the Sponsor, immediately prior to the Closing, 27.5% of the 4,628,674 Founder Shares held by the Sponsor and 27.5% of the 4,007,222 warrants to purchase Willow Lane ordinary shares held by the Sponsor, at a purchase price for all such securities equal to $1.75 per Founder Share purchased.

Pursuant to a consulting agreement, dated January 13, 2026 (the “Weil Consulting Agreement”), Pubco has engaged B. Luke Weil, Chairman and Chief Executive Officer of Willow Lane, to provide advice as needed with respect to business strategy and corporate governance and to use his reasonable efforts to introduce Pubco to clients and investors, commencing on the first business day following the day of the Closing and agreed to grant 336,000 shares of Pubco Class A Common Stock, subject to price-based vesting from the date of the Closing.

Upon the completion of the Business Combination, and assuming, among other things, that no Public Shareholders (as defined below) of Willow Lane exercise redemption rights with respect to their Public Shares (as defined below) upon completion of the Business Combination and that no shares of Pubco common stock are issued pursuant to the Boost Run 2025 Incentive Award Incentive Plan, as amended from time to time, to become effective upon the Closing (the “Incentive Plan”), (i) the Public Shareholders, (ii) the Sponsor, (iii) the Sellers, and (iv) other Boost Run shareholders including the SPV, in each case, will own approximately 20.6%, 5.5%, 71.9%, and 2.1% of the issued and outstanding shares of Pubco common stock, respectively.

This proxy statement/prospectus relates to the registration of (i) 80,774,396 shares of Pubco common stock, which consists of (a) 4,628,674 shares of Pubco Class A Common Stock issuable to the Sponsor upon the Closing of the Business Combination, (b) 29,533,018 shares of Pubco Class A Common Stock issuable upon the conversion of 29,533,018 shares of Pubco Class B Common Stock issuable to certain securities holders of Boost Run upon the Closing of the Business Combination, (c) 14,616,982 shares of Pubco Class A Common Stock issuable to certain securities holders of Boost Run upon the Closing of the Business Combination, and (d) 7,875,000 shares of Pubco Class A Common Stock issuable to Andrew Karos upon the Closing of the Business Combination, subject to certain conditions, after the Closing of the Business Combination, (e) 6,325,000 shares of Pubco Class A Common Stock issuable upon exercise of Pubco public warrants, and (f) 5,145,722 shares of Pubco Class A Common Stock issuable upon exercise of Pubco private warrants, and (ii) 6,325,000 Pubco public warrants and 5,145,722 Pubco private warrants.

Proposals to approve the Business Combination Agreement and the other matters discussed in this proxy statement/prospectus will be presented at the Meeting scheduled to be held on March 3, 2026.

The Willow Lane Class A ordinary shares, par value $0.0001 per share (the “Willow Lane Class A Ordinary Shares”) and the public warrants of Willow Lane (the “Willow Lane Public Warrants”) are currently listed on The Global Market tier of the Nasdaq Stock Market LLC (“Nasdaq”) under the symbols “WLAC” and “WLACW,” respectively. Pubco intends to apply for listing, to be effective at the time of the Closing, of its shares of Pubco common stock on Nasdaq under the symbol “BRUN” and “BRUNW,” respectively. The Willow Lane Class A ordinary shares and warrants will not trade after the Closing.

Each of Willow Lane and Pubco is an “emerging growth company” as defined in the Jumpstart Our Business Startups Act of 2012 and has elected to comply with certain reduced public company reporting requirements. Pubco is, and will be, after the consummation of the Business Combination, considered a “controlled company” under the Nasdaq Rules, and may be exempt from certain corporate governance requirements thereunder.

The existence of financial and personal interests of the Sponsor, its affiliates and Willow Lane’s directors and executive officers, promoters, and Pubco’s directors or officers may result in conflicts of interest, including a conflict between what may be in the best interests of Willow Lane and Willow Lane shareholders (“Willow Lane Shareholders”) and what may be best for a director’s personal interests when determining to recommend that shareholders vote for the proposals set forth in the accompanying proxy statement/prospectus. Please see the discussion below and the sections entitled “The Business Combination Proposal — Interests of the Sponsor and Willow Lane’s Directors and Executive Officers in the Business Combination” and “Beneficial Ownership of Securities” in the accompanying proxy statement/prospectus.

Interests of the Sponsor and Willow Lane’s Directors and Executive Officers in the Business Combination

When holders (the “Public Shareholders”) of Willow Lane Class A Ordinary Shares issued in the initial public offering of Willow Lane (such shares, the “Public Shares”) consider the recommendation of the board of directors of Willow Lane (the “Willow Lane Board”) in favor of approval of the Business Combination and the other proposals discussed in this proxy statement/prospectus (the “Proposals”), Public Shareholders should keep in mind that the Sponsor and Willow Lane’s directors and officers have interests in the Proposals that are different from, or in addition to (and which may conflict with), the interests of a Public Shareholder as a Willow Lane Shareholder. These interests include, among other things:

Boost Run and its officers and directors have financial interests that are different from, or in addition to, the interests of unaffiliated Public Shareholders, which could cause the Boost Run to pursue terms in the Business Combination that are less favorable to non-redeeming shareholders; Boost Run’s directors and officers do not owe a fiduciary duty to Willow Lane Shareholders. The anticipated continuation of Boost Run’s existing directors and officers, Andrew Karos, Erik Guckel, and Harry Georgakopoulos, as directors and officers of Pubco, may entitle such directors and officers to receive cash fees, stock options, stock awards, or other renumeration that the Pubco Board determines to pay them for their services as directors and officers. The directors, director nominees and executive officers of Boost Run, upon the consummation of the Business Combination, will hold Pubco common stock, representing, assuming a No Redemption Scenario, approximately 71.24% of Pubco common stock post-Closing, representing approximately 94.60% of the voting power of all outstanding shares of Pubco common stock. See “Post-Business Combination Beneficial Ownership Table of Pubco.” In addition, upon Closing, Andrew Karos will be entitled to receive Karos Earnout Shares based on the performance of Pubco Class A Common Stock during the three-year period beginning on and following the date of the Closing. See “The Business Combination Agreement — Consideration.”

In addition, Pubco’s controlling shareholder will be Andrew Karos. Accordingly, Public Shareholders will be subject to the decisions of Pubco’s controlling stockholder and if they are unhappy with any decisions made, will only be able to sell their shares of Pubco Class A Common Stock, potentially at a loss. At Closing, Andrew Karos’ shares of Pubco Class B Common Stock will represent approximately 48.1% of the outstanding shares of Pubco Common Stock, with dual class voting rights entitling such shares to ten votes per share, representing over 90% of the voting power of all outstanding Pubco Common Stock immediately following the Closing, based on the assumptions set forth elsewhere in this proxy statement/prospectus.

Consideration Received or to be Received by, and Securities Issued or to be Issued to, the Sponsor, its Affiliates and Promoters

Set forth below is a summary of the terms and amount of the consideration received or to be received by the Sponsor and its affiliates in connection with the Business Combination, the amount of securities issued or to be issued by Pubco to the Sponsor and its affiliates and the price paid or to be paid for such securities or any related financing transaction.

Because the Sponsor acquired the 4,628,674 Founder Shares at a nominal price per share, the Public Shareholders will incur substantial and immediate dilution upon the Closing of the Business Combination. See the sections titled “Summary of the Proxy Statement/Prospectus — Dilution,” “Risk Factors — Risks Related to the Business Combination —The Sponsor paid nominal consideration for the Sponsor Shares it holds. As a result, the Sponsor may make a substantial profit if the Business Combination is consummated, even if the shares held by the Sponsor lose substantial value and even if the Business Combination arguably may not be in the best interests of Willow Lane’s public shareholders.” and “Risk Factors — Risks Related to the Business Combination — Public Shareholders who do not redeem their Public Shares will experience substantial and immediate dilution upon Closing of the Business Combination as a result of the Founder Shares held by the Sponsor, since the value of the Willow Lane Class B Ordinary Shares is likely to be substantially higher than the nominal price paid for them, as well as a result of the issuance of the shares of Pubco common stock in the Business Combination.”

Compensation Received or to be Received by, and Securities Issued or to be Issued to, Willow Lane’s Underwriters

Set forth below is a summary of the terms and amount of the consideration received or to be received by the underwriters of the Willow Lane IPO (the “Underwriters”) in connection with the Business Combination, the amount of securities issued or to be issued by Pubco to the Underwriters and the price paid or to be paid for such securities or any related financing transaction.

The Willow Lane Board obtained a fairness opinion from Newbridge Securities Corporation (“Newbridge”), dated September 15, 2025, which provided that, as of that date and based on and subject to the assumptions, qualifications and other matters set forth therein, the consideration to be paid by Willow Lane in the Business Combination was fair, from a financial point of view, to Willow Lane and the Public Shareholders. Willow Lane obtained such fairness opinion to (i) inform themselves with respect to all material information reasonably available to them and (ii) act with appropriate care in considering the Business Combination. See the section of this proxy statement/prospectus entitled “The Business Combination Proposal — Opinion of Willow Lane’s Financial Advisor” for additional information. The independent directors of the Willow Lane Board did not separately retain an unaffiliated representative to act solely on behalf of the unaffiliated Willow Lane Shareholders to negotiate the terms of the Business Combination and/or prepare a report concerning the approval of the Business Combination.

After careful consideration, the Willow Lane Board has unanimously approved the Business Combination Agreement and the other Proposals described in the accompanying proxy statement/prospectus and the Willow Lane Board has determined that it is advisable to consummate the Business Combination. The Willow Lane Board recommends that you vote “FOR” the Proposals described in the accompanying proxy statement/prospectus (including each of the sub-proposals).

This proxy statement/prospectus provides you with detailed information about the Business Combination and other matters to be considered at the Meeting. Willow Lane encourages you to carefully read this entire document and the documents incorporated by reference. You should also carefully consider the risk factors described in “Risk Factors” on page 58 of this proxy statement/prospectus.

THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION, NOR HAS THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROXY STATEMENT/PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

This proxy statement/prospectus is dated _________, 2026, and is first being mailed to Willow Lane Shareholders on or about _________, 2026.

WILLOW LANE ACQUISITION CORP.
250 West 57th Street, Suite 415
New York, New York 10107

NOTICE OF EXTRAORDINARY GENERAL MEETING OF SHAREHOLDERS
TO BE HELD ON MARCH 3, 2026

TO THE SHAREHOLDERS OF WILLOW LANE ACQUISITION CORP.:

NOTICE IS HEREBY GIVEN that an extraordinary general meeting (the “Meeting”) of the shareholders of Willow Lane Acquisition Corp., a Cayman Islands exempted company (“Willow Lane”), will be held at which will be held at 10 :00 a.m., Eastern Time, on March 3, 2026. The Meeting will be held at the offices of Ellenoff Grossman & Schole LLP at 1345 Avenue of the Americas, 11th Floor, New York, NY 10105 and virtually over the Internet by means of a live audio webcast. You can participate in the Meeting, vote and submit questions via live webcast by visiting https://www.cstproxy.com/willowspac/2026 and using a control number assigned by Continental Stock Transfer & Trust Company. You will not be required to attend the Meeting in person in order to vote, and Willow Lane encourages virtual participation. You are cordially invited to attend the Meeting in person at the location noted above or via the live webcast noted above, and will be asked to consider and vote upon the following proposals (the “Proposals”):

We refer to these proposals as the “Organizational Documents Proposals.” The Organizational Documents Proposals are described in more detail in the accompanying proxy statement/prospectus under the heading “The Organizational Documents Proposals.”

Only holders of record of Class A ordinary shares, par value US$0.0001 each, and Class B ordinary shares, par value US$0.0001 each, of Willow Lane at the close of business on January 30, 2026 (the “Record Date”) are entitled to notice of the Meeting and to vote and have their votes counted at the Meeting and any adjournments of the Meeting.

After careful consideration, the board of directors of Willow Lane (the “Willow Lane Board”) has determined that the Business Combination Proposal, the Domestication Proposal, the Charter Proposal, the Organizational Documents Proposals, the Director Election Proposal, the Nasdaq Proposal, the Incentive Plan Proposal, the Insider Letter Amendment Proposal and the Adjournment Proposal are fair, advisable and in the best interests of Willow Lane and the Willow Lane Shareholders and unanimously recommends you vote or give instruction to vote “FOR” the Business Combination Proposal, “FOR” the Domestication Proposal (in the case of the Willow Lane Class B Shareholders), “FOR” the Charter Proposal, “FOR” the Organizational Documents Proposals, “FOR” the Director Election Proposal, “FOR” the Nasdaq Proposal, “FOR” the Incentive Plan Proposal, “FOR” the Insider Letter Amendment Proposal and “FOR” the Adjournment Proposal, if presented. When you consider the Willow Lane Board’s recommendation of the Proposals, you should keep in mind that the directors and officers of Willow Lane have interests in the Business Combination that may conflict with the interests of holders (the “Public Shareholders”) of Willow Lane Class A ordinary shares, par value $0.0001 per share (the “Willow Lane Class A Ordinary Shares”), issued in the initial public offering of Willow Lane (the “Willow Lane IPO” and such shares, the “Public Shares”). For a more complete descriptions of these interests, see the section entitled “The Business Combination Proposal — Interests of the Sponsor and Willow Lane’s Directors and Executive Officers in the Business Combination.”

The Willow Lane Board obtained a fairness opinion from Newbridge Securities Corporation (“Newbridge”), dated September 15, 2025, which provided that, as of that date and based on and subject to the assumptions, qualifications and other matters set forth therein, the consideration to be paid by Willow Lane in the Business Combination was fair, from a financial point of view, to Willow Lane. Willow Lane obtained such fairness opinion to (i) inform themselves with respect to all material information reasonably available to them and (ii) act with appropriate care in considering the Business Combination. See the section of this proxy statement/prospectus entitled “The Business Combination Proposal — Opinion of Willow Lane’s Financial Advisor” for additional information. The independent directors of the Willow Lane Board did not separately retain an unaffiliated representative to act solely on behalf of the unaffiliated Willow Lane Shareholders to negotiate the terms of the Business Combination and/or prepare a report concerning the approval of the Business Combination.

To pass, each of the Business Combination Proposal, the Charter Proposal, the Organizational Documents Proposals, the Director Election Proposal, the Nasdaq Proposal, the Incentive Plan Proposal, the Insider Letter Amendment Proposal and the Adjournment Proposal requires an ordinary resolution of the Willow Lane Shareholders, which requires the affirmative vote of a simple majority of the votes cast by, or on behalf of, the Willow Lane Shareholders as, being entitled to do so, vote in person or, where proxies are allowed, by proxy at the Meeting (assuming the presence of a quorum). Willow Lane Shareholders are also being asked to approve, on a non-binding advisory basis, the Charter Proposal, the Organizational Documents Proposals and the Director Election Proposal. Although the Willow Lane Board is asking Willow Lane Shareholders to approve the Charter Proposal, the Organizational Documents Proposals and the Director Election Proposal on a non-binding advisory basis, regardless of the outcome of the non-binding advisory vote on the Charter Proposal, the Organizational Documents Proposals and the Director Election Proposal, the Pubco Charter and Pubco Bylaws and the director elections to the Pubco Board will take effect upon the Closing if the Business Combination Proposal is approved.

Additionally, Willow Lane Class B Shareholders are being asked to approve the Domestication Proposal by a special resolution. Under the Willow Lane Memorandum and Articles, the Domestication must be approved by a special resolution passed by Willow Lane Class B Shareholders.

Under the Business Combination Agreement, the approval by Willow Lane Shareholders of the Business Combination Proposal, the Domestication Proposal, the Charter Proposal, the Director Election Proposal, the Incentive Plan Proposal, the Nasdaq Proposal and the Insider Letter Amendment Proposal are conditions to the consummation of the Business Combination. If any of those Proposals are not approved by the Willow Lane Shareholders, the Business Combination will not be consummated, unless the required approval of any Proposals that are not approved is waived by the parties. The Domestication Proposal, the Charter Proposal, the Organizational Documents Proposals, the Director Election Proposal, the Incentive Plan Proposal, the Nasdaq Proposal and the Insider Letter Amendment Proposal are conditioned upon the approval of the Business Combination Proposal. The Adjournment Proposal is not conditioned on the approval of any other Proposal.

The Sponsor currently holds 4,628,674 Class B ordinary shares of Willow Lane, par value $0.0001 per share (the “Willow Lane Class B Ordinary Shares” and, together with the Willow Lane Class A Ordinary Shares, the “Willow Lane Ordinary Shares”). The Sponsor has agreed to vote its 4,628,674 Class B Ordinary Shares, representing 26.79% of the issued and outstanding Willow Lane Ordinary Shares, in favor of each of the Proposals. As a result, with respect to each Proposal that require approval of Willow Lane Shareholders by an ordinary resolution, in addition to the Sponsor’s Willow Lane Ordinary Shares, Willow Lane would need only 4,010,664, or 31.70%, of the 12,650,000 Public Shares (assuming all issued and outstanding Willow Lane Ordinary Shares are voted at the Meeting), and would not need any Public Shares (assuming a minimum number of Willow Lane Ordinary Shares to achieve a quorum are voted at the Meeting), to be voted in favor of such Proposals in order to have such Proposals approved. With respect to each Proposal that requires approval of Willow Lane Shareholders by a special resolution, in addition to the Sponsor’s Willow Lane Ordinary Shares, Willow Lane would need only 6,890,443, or 54.47%, of the 12,650,000 Public Shares (assuming all issued and outstanding Willow Lane Ordinary Shares are voted at the Meeting), and only 1,130,886, or 8.94%, of the 12,650,000 Public Shares (assuming a minimum number of Willow Lane Ordinary Shares to achieve a quorum are voted at the Meeting), to be voted in favor of such Proposals in order to have such Proposals approved.

Upon the completion of the Business Combination, and assuming, among other things, that no Public Shareholders (as defined below) of Willow Lane exercise redemption rights with respect to their Public Shares (as defined below) upon completion of the Business Combination and that no shares of Pubco common stock are issued pursuant to the Boost Run 2025 Incentive Award Incentive Plan, as amended from time to time, to become effective upon the Closing (the “Incentive Plan”), (i) the Public Shareholders, (ii) the Sponsor, (iii) the Sellers, and (iv) other Boost Run shareholders including the SPV, in each case, will own approximately 20.6%, 5.5%, 71.9%,and 2.1% of the issued and outstanding shares of Pubco common stock, respectively.

The price per share of Pubco common stock is $10.00 per share for (i) Public Shareholders, (ii) the Sponsor, (iii) the Sellers and (iv) other Boost Run shareholders including the SPV.

The value of the consideration that the Public Shareholders are each receiving in connection with the Business Combination is thus $10.00 per share.

The aggregate value of the consideration that the Sponsor and its affiliates will receive at Closing, comprising 4,628,674 shares of Pubco common stock valued at $10.00 per share, is $46,286,740, assuming, among other things, that $1,500,000 of working capital loans extended by the Sponsor, its affiliates and Willow Lane’s directors or officers to finance transaction costs in connection with a Willow Lane business combination (the “Working Capital Loans”) are drawn and converted into Pubco common stock, and that no Public Shareholders exercise redemption rights with respect to their Public Shares upon completion of the Business Combination. In addition, up to 1,125,000 newly issued shares of Pubco Class A Common Stock (“Sponsor Earnout Shares”) may be earned by the Sponsor based on the performance of Pubco Class A Common Stock during the three-year period beginning on and following the date of the Closing.

Pursuant to a consulting agreement, dated January 13, 2026 (the “Weil Consulting Agreement”), Pubco has engaged B. Luke Weil, Chairman and Chief Executive Officer of Willow Lane, to provide advice as needed with respect to business strategy and corporate governance and to use his reasonable efforts to introduce Pubco to clients and investors, commencing on the first business day following the day of the Closing and agreed to grant 336,000 shares of Pubco Class A Common Stock, subject to price-based vesting from the date of the Closing.

The value of the consideration that Sellers will each receive, totalling $450,000,000, is comprised of a cash payment of $8,500,000, and 44,150,000 shares of Pubco common stock, valued at $10.00 per share. In addition, up to 7,875,000 newly issued shares of Pubco Class A Common Stock (the “Karos Earnout Shares”) may be earned by Mr. Karos based on the performance of Pubco Class A Common Stock during the three-year period beginning on and following the date of the Closing. Please see “The Business Combination — Merger Consideration” for more details.

Pursuant to the Willow Lane Memorandum and Articles, Willow Lane is providing the Public Shareholders with the opportunity to elect to redeem, in connection with the vote to approve the Business Combination, Public Shares then held by them for cash equal to their pro rata share of the aggregate amount on deposit (as of two (2) business days prior to the Closing) in Willow Lane’s trust account (the “Trust Account”) that holds the proceeds (including interest but less taxes payable) of the Willow Lane IPO. For illustrative purposes, based on funds in the Trust Account of approximately $____ million as of January 30, 2026, the estimated per share redemption price would have been approximately $____ per share (inclusive of $____ per share to be funded pursuant to the Working Capital Loans and which amount takes into account Willow Lane’s estimate of the amount that may be withdrawn to pay applicable taxes). Willow Lane Shareholders are not required to affirmatively vote for or against the Business Combination in order to redeem their Public Shares for cash. This means that Willow Lane Shareholders who hold Public Shares on or before February 27, 2026 (two (2) business days before the Meeting) will be eligible to elect to have their Public Shares redeemed for cash in connection with the Meeting, whether or not they are holders as of the Record Date, and whether or not such Public Shares are voted at the Meeting.

Notwithstanding the foregoing, the Willow Lane Memorandum and Articles provides that a Public Shareholder, together with any affiliate of such shareholder or any other person with whom such shareholder is acting in concert or as a “group” (as defined under Section 13 of the Exchange Act), will be restricted from redeeming its shares with respect to more than 15% of the Public Shares in the aggregate, without the prior consent of Willow Lane.

The Sponsor and Willow Lane’s executive officers and directors have agreed to waive their redemption rights with respect to any Willow Lane Ordinary Shares they may hold in connection with the consummation of the Business Combination, and such shares will be excluded from the pro rata calculation used to determine the per-share redemption price.

All Willow Lane Shareholders are cordially invited to attend the Meeting. Your vote is important regardless of the number of shares you own. Whether you plan to attend the Meeting or not, to ensure your representation at the Meeting, you are urged to complete, sign, date and return the enclosed proxy card as soon as possible and in any event no later than February 24, 2026. If you are a holder of record of Willow Lane Ordinary Shares, you may also cast your vote via Internet or in person. If your Willow Lane Ordinary Shares are held in an account at a brokerage firm or bank, you must instruct your broker or bank on how to vote your shares or, if you wish to attend the Meeting and vote yourself, obtain a proxy from your broker or bank. If you do not vote or do not instruct your broker or bank how to vote, it will have no effect on any of the Proposals.

Your attention is directed to the proxy statement accompanying this notice (including the annexes thereto) for a more complete description of the proposed Business Combination and related transactions and each of the Proposals. We encourage you to read this proxy statement carefully. If you have any questions or need assistance voting your shares, you may call Sodali & Co, Willow Lane’s proxy solicitor, at (203) 658-9400 (banks and brokers) or email at WLAC@info.sodali.com.

IF YOU RETURN YOUR PROXY CARD WITHOUT AN INDICATION OF HOW YOU WISH TO VOTE, YOUR SHARES WILL BE VOTED AT THE DISCRETION OF YOUR PROXY.

IN ORDER TO EXERCISE YOUR REDEMPTION RIGHTS, YOU MUST, NO LATER THAN 5:00 P.M. EASTERN TIME ON FEBRUARY 27, 2026 (TWO BUSINESS DAYS PRIOR TO THE MEETING), DEMAND THAT WILLOW LANE REDEEM YOUR PUBLIC SHARES FOR CASH BY (A) DELIVERING A NOTICE TO WILLOW LANE’S TRANSFER AGENT AND (B) TENDERING YOUR PUBLIC SHARES TO WILLOW LANE’S TRANSFER AGENT. YOU MAY TENDER YOUR PUBLIC SHARES BY EITHER DELIVERING YOUR SHARE CERTIFICATE TO THE TRANSFER AGENT OR BY DELIVERING YOUR PUBLIC SHARES ELECTRONICALLY USING THE DEPOSITORY TRUST COMPANY’S DWAC (DEPOSIT WITHDRAWAL AT CUSTODIAN) SYSTEM. WHETHER OR NOT, OR HOW, YOU VOTE ON ANY PROPOSAL WILL NOT AFFECT YOUR ELIGIBILITY FOR EXERCISING REDEMPTION RIGHTS. IF THE BUSINESS COMBINATION IS NOT COMPLETED, THEN YOUR PUBLIC SHARES WILL NOT BE REDEEMED IN CONNECTION WITH THE BUSINESS COMBINATION. IF YOU HOLD YOUR PUBLIC SHARES IN “STREET NAME,” YOU WILL NEED TO INSTRUCT THE ACCOUNT EXECUTIVE AT YOUR BANK OR BROKER TO WITHDRAW THE PUBLIC SHARES FROM YOUR ACCOUNT IN ORDER TO EXERCISE YOUR REDEMPTION RIGHTS. SEE “EXTRAORDINARY GENERAL MEETING OF WILLOW LANE SHAREHOLDERS — REDEMPTION RIGHTS” FOR MORE SPECIFIC INSTRUCTIONS.

ADDITIONAL INFORMATION

This document incorporates important business and financial information about Willow Lane filed with the Securities and Exchange Commission (the “SEC”) that is not included in or delivered with this document. You can obtain any of the documents filed with the SEC by Willow Lane at no cost from the SEC’s website at www.sec.gov. You may also request copies of these documents, including documents incorporated by reference into this document, at no cost, by contacting Willow Lane. Please see “Where You Can Find More Information” for more details. In order to receive timely delivery of the documents in advance of the Meeting, you should make your request to

Willow Lane Acquisition Corp.
250 West 57th Street, Suite 415
New York, New York 10107
Email: info@willowac.com
or
Sodali & Co

430 Park Ave

14^th Fl

New York, NY 10022

Telephone: (800) 662-9400
Bank and Brokers can call at (203) 658-9400
Email: WLAC@info.sodali.com

To obtain timely delivery, you must request the information no later than five (5) business days before the date you must make their investment decision.

No person is authorized to give any information or to make any representation with respect to the matters that this proxy statement/prospectus describes other than those contained in this proxy statement/prospectus, and, if given or made, the information or representation must not be relied upon as having been authorized by Willow Lane, Pubco or Boost Run. This proxy statement/prospectus does not constitute an offer to sell or a solicitation of an offer to buy securities or a solicitation of a proxy in any jurisdiction where, or to any person to whom, it is unlawful to make such an offer or a solicitation. Neither the delivery of this proxy statement/prospectus nor any distribution of securities made under this proxy statement/prospectus will, under any circumstances, create an implication that there has been no change in the affairs of Willow Lane, Pubco or Boost Run since the date of this proxy statement/prospectus or that any information contained herein is correct as of any time subsequent to such date.

You will not be charged for any of these documents that you request. To obtain timely delivery of requested materials, you must request the documents no later than five (5) business days prior to the date of the Meeting.

TABLE OF CONTENTS

About This Proxy Statement/Prospectus

This document, which forms part of a registration statement on Form S-4 filed with the SEC by Pubco (File No. 333-_____ ), constitutes a prospectus of Pubco under Section 5 of the U.S. Securities Act of 1933, as amended (the “Securities Act”), with respect to the shares of Pubco common stock to be issued 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 (the “Exchange Act”), with respect to the Meeting of Willow Lane Shareholders at which Willow Lane Shareholders will be asked to consider and vote upon the approval of the Business Combination Proposal, among other matters, as described below:

Willow Lane files reports, proxy statements/prospectuses and other information with the SEC as required by the Exchange Act. You can read Willow Lane’s SEC filings, including this proxy statement/prospectus, over the Internet at the SEC’s website at http://www.sec.gov.

This proxy statement/prospectus does not constitute an offer to sell, or a solicitation of an offer to buy, any securities or the solicitation of a proxy, in any jurisdiction to or from any person to whom it is not lawful to make any such offer or solicitation in such jurisdiction.

You may request copies of this proxy statement/prospectus, without charge, by written or oral request to Willow Lane’s proxy solicitor at:

Sodali & Co

430 Park Ave

14^th Fl

New York, NY 10022
Telephone: (800) 662-5200
Bank and Brokers can call at (203) 658-9400
Email: WLAC@info.sodali.com

To obtain timely delivery of requested materials, you must request the documents no later than five (5) business days prior to the date of the Meeting.

You may also obtain additional information about Willow Lane 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 (which includes the name of the beneficial owner of the shares) and deliver your Public Shares electronically to Willow Lane’s transfer agent at least two (2) business days prior to the Meeting in accordance with the procedures detailed under the question “How do I exercise my redemption rights?” in the section entitled “Questions and Answers About the Proposals.” If you have questions regarding the certification of your position or delivery of your shares, please contact:

Continental Stock Transfer & Trust Company

One State Street Plaza, 30^th Floor

New York, New York 10004

Email: spacredemptions@continentalstock.com

FINANCIAL STATEMENT PRESENTATION

Pubco

The audited financial statements of Pubco as of September 30, 2025 and for the period from September 5, 2025 (inception) through September 30, 2025 included in this proxy statement/prospectus have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”).

Willow Lane

The financial statements of Willow Lane included in this proxy statement/prospectus have been prepared in accordance with U.S. GAAP.

Boost Run

Boost Run was formed in Delaware on March 21, 2024. The financial statements of Boost Run included in this proxy statement/prospectus have been prepared in accordance with U.S. GAAP.

This proxy statement/prospectus contains:

Unless indicated otherwise, financial data presented in this proxy statement/prospectus has been taken from the audited and unaudited financial statements of Willow Lane, Boost Run and Pubco, as applicable, included in this proxy statement/prospectus.

In this proxy statement/prospectus, unless otherwise specified, all monetary amounts are in U.S. dollars, all references to “$,” “US$,” “USD” and “dollars” mean U.S. dollars.

INDUSTRY AND MARKET DATA

In this proxy statement/prospectus, Pubco, Willow Lane and Boost Run rely on and refer to industry data, information and statistics regarding the markets in which Boost Run competes that have been extracted from publicly available information, industry and general publications and research and studies conducted by third parties. Each of Pubco, Willow Lane and Boost Run has taken such care as it considers reasonable in the extraction and reproduction of such data, information and statistics.

Industry publications, research, studies and forecasts generally state that the information they contain has been obtained from sources believed to be reliable, but that the accuracy and completeness of such information is not guaranteed. The industry in which Pubco will operate is subject to a high degree of uncertainty and risk due to a variety of factors, including those described in the section of this proxy statement/prospectus entitled “Risk Factors.” Furthermore, such information and data cannot always be verified with complete certainty due to limits on the availability and reliability of data, the voluntary nature of the data gathering process and other limitations and uncertainties. Finally, while each of Pubco, Willow Lane and Boost Run believes its own internal estimates and research are reliable, and is not aware of any misstatements regarding such information and data presented in this proxy statement/prospectus, such research has not been verified by any independent source. 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 the section of this proxy statement/prospectus entitled “Risk Factors.” These and other factors could cause results to differ materially from those expressed in the forecasts or estimates from independent third parties and us.

Notwithstanding anything in this proxy statement/prospectus to the contrary, Pubco, Willow Lane and Boost Run are responsible for all disclosures in this proxy statement/prospectus.

TRADEMARKS, TRADE NAMES AND SERVICE MARKS

This proxy statement/prospectus contains references to trademarks and service marks belonging to other entities.

Each of Willow Lane and Boost Run and its affiliates own or have rights to trademarks, trade names and service marks that they use in connection with the operation of their businesses. In addition, their names, logos and website names and addresses are their trademarks or service marks. Other trademarks, trade names and service marks appearing in this proxy statement/prospectus are the property of their respective owners. Solely for convenience, in some cases, the trademarks, trade names and service marks referred to in this proxy statement/prospectus are listed without the applicable ^®, ™ and ^SM symbols, but they will assert, to the fullest extent under applicable law, their rights to these trademarks, trade names and service marks.

DEFINED TERMS

In this document the following terms, when capitalized, have the following meanings.

“$,” “USD,” “US$” and “U.S. dollar” each refer to the legal currency of the United States.

“Administrative Services Agreement” means the administrative services agreement between Willow Lane and BLW Office LLC, an affiliate of the Sponsor.

“API” means application programming interface.

“Boost Run” means Boost Run Holdings, LLC, a Delaware limited liability company.

“BTIG” means BTIG, LLC, the sole book-running manager for and representative of the Underwriters.

“Business Combination” means the transactions contemplated by the Business Combination Agreement, including the Domestication and Mergers.

“Business Combination Agreement” means the Business Combination Agreement, dated September 15, 2025 and as amended on January 13, 2026, and as may be further amended from time to time, by and among Willow Lane, Boost Run, Pubco, SPAC Merger Sub, Company Merger Sub, SPAC Representative and Seller Representative. A current copy of the Business Combination Agreement is attached to this proxy statement/prospectus as Annex A.

“Clawback Policy” means the Executive Compensation Clawback Policy of Willow Lane.

“Closing” means the consummation of the transactions contemplated in the Business Combination Agreement.

“Code” means the Internal Revenue Code of 1986, as amended.

“Code of Ethics” means the Code of Business Conduct and Ethics of Willow Lane.

“Combination Period” means the period ended November 12, 2026, or such later date as the shareholders may approve in accordance with the Willow Lane Memorandum and Articles.

“Company” means Boost Run.

“Company Merger” means the merger of Company Merger Sub with and into Boost Run, with Boost Run continuing as the surviving entity, as part of the Business Combination.

“Company Merger Sub” means Benchmark Merger Sub II LLC, a Delaware limited liability company and wholly owned subsidiary of Pubco.

“Compensation Committee” means the compensation committee of Willow Lane.

“Craig-Hallum” means Craig-Hallum Capital Group LLC, co-manager for the Willow Lane IPO.

“CST” means Continental Stock & Transfer Company.

“Earnout Agreement” means the earnout agreement entered into September 15, 2025, as amended on January 13, 2026, by and among the Sponsor, Pubco and SPV.

“Earnout Period” means the time period beginning on the date of the Closing ending on the three-year anniversary of the Closing.

“EGS” means Ellenoff Grossman & Schole LLP.

“Exchange Act” means the U.S. Securities Exchange Act of 1934, as amended, and the rules and regulations promulgated thereunder.

“FINRA” means Financial Industry Regulatory Authority, Inc.

“Founder Shares” means 4,628,674 Willow Lane Class B Ordinary Shares held by the Sponsor.

“GPU” means Graphics Processing Unit.

“HPC” means high-performance compute.

“Incentive Plan” means the Pubco 2026 Omnibus Incentive Plan, as amended from time to time, to become effective upon the Closing.

“Insider Letter” means the letter agreement dated November 7, 2024, by and among Willow Lane, its officers, directors and the Sponsor.

“Insider Letter Amendment” means the amendment to the letter agreement, dated as of September 15, 2025, by and among Willow Lane Acquisition Corp., Willow Lane Sponsor, LLC, BTIG, LLC, Boost Run Inc., Boost Run Holdings, LLC and the members of the board of directors or management team of Willow Lane Acquisition Corp. who are signatories thereto.

“Lock-Up Agreement” means the lock-up agreements dated September 17, 2025 and entered into by and among the Sellers, Boost Run, and Willow Lane.

“Meeting” means the extraordinary general meeting of Willow Lane Shareholders, to be held at 10:00 a.m. Eastern Time, on March 3, 2026 at offices of Ellenoff Grossman & Schole LLP at 1345 Avenue of the Americas, 11th Floor, New York, NY 10105 and virtually via live webcast on the Internet at https://www.cstproxy.com/willowspac/2026, and any adjournments or postponements of such extraordinary general meeting.

“Merger Subs” means SPAC Merger Sub together with Company Merger Sub.

“Mergers” means the SPAC Merger, together with the Company Merger.

“Nasdaq Rules” means the rules of the Global Market tier of the Nasdaq Stock Market.

“Newbridge” means Newbridge Securities Corporation.

“Note” means the installment note in the initial principal amount of $8,500,000, to be paid by Pubco to Andrew Karos.

“NTBV” means net tangible book value.

“Private Placement Warrants” means the warrants to purchase Willow Lane Class A Ordinary Shares purchased as part of the private placement that occurred simultaneously with the Willow Lane IPO. Following the Domestication, references to “Private Placement Warrants” mean the private placement warrants of Willow Lane, each of which is exercisable for one Pubco Class A Common Share. Following the Closing, references to “Private Placement Warrants” mean the “Pubco Private Warrants.”

“Pubco” means Boost Run Inc., a Delaware corporation.

“Pubco Board” means the board of directors of Pubco.

“Pubco Bylaws” means the bylaws of Pubco.

“Pubco Charter” means the amended and restated certificate of incorporation of Pubco.

“Pubco Class A Common Stock” means the Class A Common Stock, par value $0.0001 per share, of Pubco.

“Pubco Class B Common Stock” means the Class B Common Stock, par value $0.0001 per share, of Pubco.

“Pubco common stock” means the Pubco Class A Common Stock and Pubco Class B Common Stock.

“Pubco Preferred Stock” means the preferred stock, par value $0.0001 per share, of Pubco.

“Pubco Organizational Documents” means the Pubco Charter and the Pubco Bylaws.

“Pubco Public Warrants” the equivalent warrants of Pubco issued in exchange for the Willow Lane Public Warrants (as defined below) upon consummation of the Merger.

“Public Shares” means the Willow Lane Class A Ordinary Shares issued in the Willow Lane IPO.

“Public Shareholders” means the holders of Willow Lane Class A Ordinary Shares.

“Proposals” means the proposals included in this proxy statement/prospectus.

“SEC” means the U.S. Securities and Exchange Commission.

“Securities Act” means the U.S. Securities Act of 1933, as amended, and the rules and regulations promulgated thereunder.

“SPAC Representative” means George Peng, solely in his capacity as the representative from and after the Effective Time, of the Willow Lane shareholders as of immediately prior to the Effective Time and their successors and assigns (other than the Sellers).

“Seller Support Agreement” means the support agreement dated September 15, 2025 by and among the Sellers, Willow Lane and Boost Run.

“Sellers” means the holders of Boost Run’s issued and outstanding membership interests prior to the Closing.

“Sellers Representative” means Andrew Karos solely in his capacity as the representative, from and after the Effective Time, of the Sellers as of immediately prior to the Effective Time and their successors and assigns, in accordance with the terms and conditions of the Business Combination Agreement.

“SPAC Insiders” means the Sponsor and to the officers and directors of Willow Lane, collectively.

“SPAC Merger Sub” means Benchmark Merger Sub I Inc., a Delaware corporation and a wholly-owned subsidiary of Pubco.

“SPAC Merger” means the merger of SPAC Merger Sub merges into Willow Lane, with Willow Lane continuing as the surviving entity, as part of the Business Combination.

“SPV” means Goodrich ILMJS LLC, a Delaware limited liability company.

“Sponsor” means Willow Lane Sponsor, LLC, a Delaware limited liability company.

“Transfer Agreement” means the transfer agreement entered into on September 15, 2025, between the Sponsor and SPV.

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

“Underwriters” means Willow Lane’s underwriters of the Willow Lane IPO.

“Underwriting Agreement” means the underwriting agreement between Willow Lane and BTIG entered into on November 7, 2024, as amended on October 17, 2025.

“U.S. GAAP” means U.S. generally accepted accounting principles.

“VWAP” means volume-weighted average price.

“Weil Consulting Agreement” means the consulting agreement entered into January 13, 2026, by and between Pubco and B. Luke Weil.

“Willow Lane” means Willow Lane Acquisition Corp., a Cayman Islands exempted company.

“Willow Lane Board” means the board of directors of Willow Lane.

“Willow Lane Class A Ordinary Shares” means the Class A ordinary shares, par value $0.0001 per share, of Willow Lane.

“Willow Lane Class B Ordinary Shares” means the Class B ordinary shares, par value $0.0001, of Willow Lane.

“Willow Lane Class B Shareholders” means holders of Willow Lane Class B Ordinary Shares.

“Willow Lane IPO” or “Initial Public Offering” means the Willow Lane initial public offering of units consummated on November 12, 2024.

“Willow Lane Memorandum and Articles” means the Amended and Restated Memorandum and Articles of Association of Willow Lane.

“Willow Lane Ordinary Shares” means the Willow Lane Class A Ordinary Shares and the Willow Lane Class B Ordinary Shares.

“Willow Lane Public Warrants” means the warrants issued in the Willow Lane IPO.

“Willow Lane Shareholders” means holders of Willow Lane Ordinary Shares.

“Winston” means Winston & Strawn LLP.

“Working Capital Loans” means the working capital loans to Willow Lane to finance the transaction costs in connection with an intended initial business combination.

“Working Capital Warrants” means the warrants of Pubco that the Working Capital Loans may convert into, at the option of the lender.

Cautionary Note Regarding Forward-Looking Statements

Certain statements in this proxy statement/prospectus may constitute “forward-looking statements” for purposes of the federal securities laws. Forward-looking statements include, but are not limited to, statements regarding Pubco, Willow Lane and Boost Run and their respective management teams’ expectations, hopes, beliefs, intentions or strategies regarding the future. In addition, any statements that refer to projections, forecasts or other characterizations of future events or circumstances, including any underlying assumptions, are forward-looking statements. The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intends,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “strive,” “will,” “would” and similar expressions may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking. Forward-looking statements in this proxy statement/prospectus may include, for example, statements about:

These forward-looking statements are based on information available as of the date of this proxy statement/prospectus, and current expectations, forecasts and assumptions and involve a number of judgments, risks and uncertainties. Accordingly, forward-looking statements should not be relied upon as representing the views of Pubco, Willow Lane and Boost Run as of any subsequent date, and neither Pubco, Willow Lane nor Boost Run undertake any obligation to update forward-looking statements to reflect events or circumstances after the date they were made, whether as a result of new information, future events or otherwise, except as may be required under applicable securities laws.

You should not place undue reliance on these forward-looking statements in deciding how to grant your proxy or to instruct how your vote should be cast or how you should vote your shares on the Proposals. As a result of a number of known and unknown risks and uncertainties, the actual results or performance of Pubco may be materially different from those expressed or implied by these forward-looking statements. Some factors that could cause actual results to differ include:

While forward-looking statements reflect Pubco’s, Willow Lane’s and Boost Run’s good faith beliefs, as applicable, they are not guarantees of future performance. Except as otherwise required by applicable law, Pubco, Willow Lane and Boost Run disclaim any obligation to publicly update or revise any forward-looking statement to reflect changes in underlying assumptions or factors, new information, data or methods, future events or other changes after the date of this proxy statement/prospectus. For a further discussion of these and other factors that could cause Pubco’s, Willow Lane’s and Boost Run’s future results, performance or transactions to differ significantly from those expressed in any forward-looking statement, please see the section entitled “Risk Factors.” You should not place undue reliance on any forward-looking statements, which are based only on information currently available to Pubco, Willow Lane and Boost Run.

Questions and Answers About the Proposals

The questions and answers below highlight only selected information from this proxy statement/prospectus and only briefly address some commonly asked questions about the Meeting and the Proposals. The following questions and answers do not include all the information that is important to Willow Lane Shareholders. Willow Lane Shareholders are urged to carefully read this entire proxy statement/prospectus, including the annexes and the other documents referred to herein, to fully understand the proposed Business Combination and the voting procedures for the Meeting.

Willow Lane will hold the Meeting to consider and vote upon these Proposals. This proxy statement/prospectus contains important information about the proposed Business Combination and the other matters to be acted upon at the Meeting. Willow Lane Shareholders should read it carefully.

The vote of Willow Lane Shareholders is important. Willow Lane Shareholders are encouraged to vote as soon as possible after carefully reviewing this proxy statement/prospectus.

Potential ownership of issued and outstanding shares of Pubco common stock upon Closing:

Potential ownership of fully diluted shares of Pubco common stock upon Closing: