Willow Lane Acquisition (WLAC) Sponsor exits SPAC holdings in Boost Run deal

Rhea-AI Filing Summary

Willow Lane Acquisition Corp. reported insider transactions tied to its closing business combination with Boost Run Holdings and Boost Run Inc. On May 8, 2026, Willow Lane Sponsor, LLC, an entity associated with CEO B. Luke Weil, converted 4,628,674 Class B Ordinary Shares into the same number of Class A Ordinary Shares and then tendered those Class A shares in a transaction where they were cancelled in exchange for Class A common stock of Pubco. On the same date, the Sponsor also disposed of 4,007,222 warrants to purchase Class A Ordinary Shares, which were cancelled in exchange for Pubco warrants. Following these steps, the Sponsor and Mr. Weil held zero Class A Ordinary Shares and zero warrants of Willow Lane Acquisition Corp., with their economic interest shifted to securities of Pubco.

Insights

SPAC and capital markets analyst

Insider position in the SPAC is fully migrated to the post‑merger Pubco.

The filing shows Willow Lane Sponsor, LLC, tied to CEO B. Luke Weil, converting 4,628,674 Class B shares into Class A and tendering them as part of the Business Combination. Concurrently, 4,007,222 SPAC warrants were cancelled and exchanged for Pubco warrants.

After these transactions, the Sponsor and Weil no longer hold Class A shares or warrants of Willow Lane Acquisition Corp.; their interest now resides in Pubco equity and warrants. This is a structural shift common in SPAC mergers rather than a discretionary open‑market trade, so it is best viewed as administratively important but not, on its own, a directional signal on valuation.

Insider Trade Summary

4,628,674 shares exercised/converted

Mixed 5 txns

Insider Weil B. Luke, Willow Lane Sponsor, LLC

Role Chief Executive Officer | null

Type	Security	Shares	Price	Value
Exercise	Class B Ordinary Shares	4,628,674	$0.00	--
U	Warrants	4,007,222	$11.50	$46.08M
Exercise	Class A Ordinary Shares	4,628,674	$0.00	--
U	Class A Ordinary Shares	4,628,674	$0.00	--
Other	Warrants	4,007,222	$11.50	$46.08M

Holdings After Transaction: Class B Ordinary Shares — 0 shares (Indirect, See footnote); Warrants — 0 shares (Indirect, See footnote); Class A Ordinary Shares — 4,628,674 shares (Indirect, See footnote)

Footnotes (1)

1. Willow Lane Sponsor, LLC (the "Sponsor") is the record holder of the securities reported herein. B. Luke Weil is the sole managing member of the Sponsor and holds voting and investment discretion with respect to the securities held of record by the Sponsor. As such, B. Luke Weil may be deemed to have beneficial ownership of the securities held of record by the Sponsor. B. Luke Weil disclaims any beneficial ownership except to the extent of his pecuniary interest therein. In connection with the closing of the business combination (the "Business Combination") on May 8, 2026 among Willow Lane Acquisition Corp. (the "Issuer"), Boost Run Holdings, LLC ("Boost Run"), Boost Run Inc. ("Pubco") and other parties named therein under that certain Business Combination Agreement, dated September 15, 2025 and amended on January 13, 2026, these Class A Ordinary Shares of the Issuer were cancelled in exchange for an equal number of shares of Class A common stock, par value $0.0001 per share, of Pubco. Following the Business Combination, the Sponsor and Mr. Weil own zero Class A Ordinary Shares of the Issuer. As described in the registration statement on Form S-1, as amended (File No. 333-282495), of the Issuer under the heading "Description of Securities--Founder Shares," the Class B Ordinary Shares will automatically convert into Class A Ordinary Shares at the time of the Issuer's initial business combination, or at any time prior to the Issuer's initial business combination, at the option of the holder, on a one-for-one basis, subject to certain adjustments. On May 8, 2026, in connection with the consummation of the Business Combination, 4,628,674 Class B Ordinary Shares were converted into an aggregate of 4,628,674 Class A Ordinary Shares. These warrants were purchased and issued on November 7, 2024, simultaneously with the closing of the Issuer's initial public offering and become exercisable 30 days after the completion of the Issuer's initial business combination. The warrants expire on a date that is five years after the completion of the Issuer's initial business combination. In connection with the closing of the Business Combination, these warrants of the Issuer were cancelled in exchange for an equal number of warrants of Pubco. Following the Business Combination, the Sponsor and Mr. Weil own zero warrants of the Issuer.

Key Figures

Class B shares converted: 4,628,674 shares Class A shares cancelled/exchanged: 4,628,674 shares Warrants cancelled/exchanged: 4,007,222 warrants +3 more

6 metrics

Class B shares converted 4,628,674 shares Converted into Class A Ordinary Shares on May 8, 2026

Class A shares cancelled/exchanged 4,628,674 shares Cancelled and exchanged for Pubco Class A on May 8, 2026

Warrants cancelled/exchanged 4,007,222 warrants WLAC warrants cancelled for Pubco warrants at business combination

Warrant exercise price $11.50 per warrant Original WLAC warrant terms from November 7, 2024 issuance

Post-transaction WLAC Class A holdings 0 shares Sponsor and Weil holdings of WLAC Class A after Business Combination

Post-transaction WLAC warrant holdings 0 warrants Sponsor and Weil holdings of WLAC warrants after Business Combination

Key Terms

Business Combination, tender offer, Class B Ordinary Shares, warrants, +1 more

5 terms

Business Combination financial

"In connection with the closing of the business combination (the "Business Combination") on May 8, 2026 among Willow Lane Acquisition Corp."

A business combination happens when two or more companies join together to operate as one, like two friends merging their teams into a single group. This is important because it can change how companies grow, compete, and make money, often making them bigger and more powerful in the market.

tender offer financial

"transaction_code "U" with description "Disposition pursuant to a tender offer" for Class A Ordinary Shares and warrants"

A tender offer is a proposal made by a person or company to buy shares from existing shareholders at a set price, usually higher than the current market value, within a specific time frame. It matters to investors because it can lead to a change in ownership or control of a company, and shareholders must decide whether to sell their shares at the offered price.

Class B Ordinary Shares financial

"4,628,674 Class B Ordinary Shares were converted into an aggregate of 4,628,674 Class A Ordinary Shares."

Class B ordinary shares are a type of ownership stake in a company that typically come with different voting rights or privileges compared to other share classes. For investors, they represent a way to hold part of the company’s value and influence its decisions, often with fewer voting rights than Class A shares. Understanding these shares helps investors assess their level of control and potential returns within a company.

warrants financial

"These warrants were purchased and issued on November 7, 2024, simultaneously with the closing of the Issuer's initial public offering"

Warrants are special documents that give you the right to buy a company's stock at a set price before a certain date. They are often used as a way for companies to attract investors or raise money, and their value can increase if the company's stock price goes up.

beneficial ownership financial

"B. Luke Weil may be deemed to have beneficial ownership of the securities held of record by the Sponsor."

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

X

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Weil B. Luke

(Last) (First) (Middle)

250 WEST 57TH STREET SUITE 415

(Street)

NEW YORK NEW YORK 10107

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Willow Lane Acquisition Corp. [ WLAC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	X	10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/08/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

	Form filed by One Reporting Person
X	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Ordinary Shares	05/08/2026		M		4,628,674	A	(2)	4,628,674	I(1)	See footnote(1)
Class A Ordinary Shares	05/08/2026		U		4,628,674	D	(2)	0	I(1)	See footnote(1)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Class B Ordinary Shares	(2)(3)	05/08/2026		M(2)(3)			4,628,674	(2)(3)	(2)(3)	Class A Ordinary Shares	4,628,674(2)(3)	$0	0(2)(3)	I(1)	See footnote(1)
Warrants	(2)(4)	11/07/2024		J(2)(4)		4,007,222		(2)(4)	(2)(4)	Class A Ordinary Shares	4,007,222	$11.5	4,007,222(2)(4)	I(1)	See footnote(1)
Warrants	(2)(4)(5)	05/08/2026		U(2)(5)			4,007,222	(2)(4)(5)	(2)(4)(5)	Class A Ordinary Shares	4,007,222	$11.5	0(2)(5)	I(1)	See footnote(1)

1. Name and Address of Reporting Person^*

Weil B. Luke

(Last) (First) (Middle)

250 WEST 57TH STREET SUITE 415

(Street)

NEW YORK NEW YORK 10107

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

1. Name and Address of Reporting Person^*

Willow Lane Sponsor, LLC

(Last) (First) (Middle)

250 WEST 57TH STREET SUITE 415

(Street)

NEW YORK NEW YORK 10107

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

Explanation of Responses:

1. Willow Lane Sponsor, LLC (the "Sponsor") is the record holder of the securities reported herein. B. Luke Weil is the sole managing member of the Sponsor and holds voting and investment discretion with respect to the securities held of record by the Sponsor. As such, B. Luke Weil may be deemed to have beneficial ownership of the securities held of record by the Sponsor. B. Luke Weil disclaims any beneficial ownership except to the extent of his pecuniary interest therein.

2. In connection with the closing of the business combination (the "Business Combination") on May 8, 2026 among Willow Lane Acquisition Corp. (the "Issuer"), Boost Run Holdings, LLC ("Boost Run"), Boost Run Inc. ("Pubco") and other parties named therein under that certain Business Combination Agreement, dated September 15, 2025 and amended on January 13, 2026, these Class A Ordinary Shares of the Issuer were cancelled in exchange for an equal number of shares of Class A common stock, par value $0.0001 per share, of Pubco. Following the Business Combination, the Sponsor and Mr. Weil own zero Class A Ordinary Shares of the Issuer.

3. As described in the registration statement on Form S-1, as amended (File No. 333-282495), of the Issuer under the heading "Description of Securities--Founder Shares," the Class B Ordinary Shares will automatically convert into Class A Ordinary Shares at the time of the Issuer's initial business combination, or at any time prior to the Issuer's initial business combination, at the option of the holder, on a one-for-one basis, subject to certain adjustments. On May 8, 2026, in connection with the consummation of the Business Combination, 4,628,674 Class B Ordinary Shares were converted into an aggregate of 4,628,674 Class A Ordinary Shares.

4. These warrants were purchased and issued on November 7, 2024, simultaneously with the closing of the Issuer's initial public offering and become exercisable 30 days after the completion of the Issuer's initial business combination. The warrants expire on a date that is five years after the completion of the Issuer's initial business combination.

5. In connection with the closing of the Business Combination, these warrants of the Issuer were cancelled in exchange for an equal number of warrants of Pubco. Following the Business Combination, the Sponsor and Mr. Weil own zero warrants of the Issuer.

	/s/ B. Luke Weil	05/12/2026
	/s/ Willow Lane Sponsor, LLC, By: B. Luke Weil, its managing member	05/12/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transactions did Willow Lane Acquisition Corp. (WLAC) report in this Form 4?

The Form 4 reports conversions and dispositions linked to the business combination. The Sponsor converted 4,628,674 Class B Ordinary Shares into Class A and disposed of those Class A shares and 4,007,222 warrants, exchanging them for equivalent Pubco securities.

How many Willow Lane Acquisition (WLAC) Class B shares were converted in the transaction?

A total of 4,628,674 Class B Ordinary Shares were converted into 4,628,674 Class A Ordinary Shares. This automatic one-for-one conversion occurred on May 8, 2026, in connection with the consummation of the Business Combination described in the Form 4 footnotes.

What happened to Willow Lane Acquisition Corp. (WLAC) warrants held by the Sponsor?

The Sponsor held 4,007,222 warrants initially issued at an $11.50 exercise price. In connection with the Business Combination, these WLAC warrants were cancelled and replaced with an equal number of Pubco warrants, leaving the Sponsor and Mr. Weil with zero WLAC warrants afterward.

Does CEO B. Luke Weil still own Willow Lane Acquisition (WLAC) Class A shares after these transactions?

No. The footnotes state that, following the Business Combination and related tender offer, Willow Lane Sponsor, LLC and B. Luke Weil own zero Class A Ordinary Shares of Willow Lane Acquisition Corp.; their holdings were exchanged for Pubco Class A common stock instead.

Who is the actual record holder of the WLAC securities reported in this Form 4?

Willow Lane Sponsor, LLC is the record holder of the reported securities. B. Luke Weil is the sole managing member with voting and investment discretion, and he may be deemed a beneficial owner but disclaims beneficial ownership beyond his pecuniary interest in the Sponsor.

How are the warrant terms for Willow Lane Acquisition (WLAC) described before the Business Combination?

The warrants were purchased at WLAC’s IPO closing on November 7, 2024. They become exercisable 30 days after completion of the initial business combination and expire five years after that completion date, according to the warrant-related footnote in the Form 4.