Boost Run Inc. (BRUN) director receives 25,375 shares via sponsor distribution

Rhea-AI Filing Summary

Boost Run Inc. director Jeremy Rayne Steinberg reported acquiring 25,375 shares of Class A Common Stock on May 12, 2026. The transaction is coded as an exercise or conversion of a derivative security at a reported price of $0.00 per share, leaving him with 25,375 shares held directly. A footnote explains these shares were received as member distributions from Willow Lane Sponsor, LLC, rather than through an open-market purchase.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Steinberg Jeremy Rayne

Role null

Type	Security	Shares	Price	Value
Exercise	Class A Common Stock	25,375	$0.00	--

Holdings After Transaction: Class A Common Stock — 25,375 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Shares acquired: 25,375 shares Price per share: $0.00 per share Shares held after transaction: 25,375 shares

3 metrics

Shares acquired 25,375 shares Class A Common Stock acquired on May 12, 2026

Price per share $0.00 per share Reported transaction price for acquired shares

Shares held after transaction 25,375 shares Direct holdings following the May 12, 2026 transaction

Key Terms

Class A Common Stock, derivative exercise/conversion, member distributions, Willow Lane Sponsor, LLC

4 terms

Class A Common Stock financial

"security_title: "Class A Common Stock""

Class A common stock is a category of a company’s shares that carries a specific set of ownership rights—most commonly defined voting power and claims on dividends—set out in the company’s charter. For investors it matters because the class determines how much influence you have over corporate decisions, the share’s likely dividend and trading behavior, and how it compares in value to other share classes, like choosing a particular seat with different privileges at the company’s decision-making table.

derivative exercise/conversion financial

"transaction_action: "derivative exercise/conversion""

member distributions financial

"Shares acquired were received as member distributions from Willow Lane Sponsor, LLC"

Willow Lane Sponsor, LLC financial

"Shares acquired were received as member distributions from Willow Lane Sponsor, LLC"

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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

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^*

Steinberg Jeremy Rayne

(Last) (First) (Middle)

C/O BOOST RUN INC.

5 REVERE DRIVE, SUITE 200

(Street)

NORTHBROOK ILLINOIS 60062

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Boost Run Inc. [ BRUN ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/12/2026

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

X	Form filed by One Reporting Person
	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 Common Stock	05/12/2026		M		25,375	A	$0.00(1)	25,375	D

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

Explanation of Responses:

1. Shares acquired were received as member distributions from Willow Lane Sponsor, LLC (the "Sponsor").

	/s/ Rayne Steinberg	06/16/2026
	** 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 transaction did Boost Run Inc. (BRUN) disclose for Jeremy Rayne Steinberg?

Boost Run Inc. reported that director Jeremy Rayne Steinberg acquired 25,375 shares of Class A Common Stock. The shares were received on May 12, 2026 through a derivative exercise coded transaction, rather than a traditional open-market stock purchase.

How many Boost Run (BRUN) shares does Jeremy Rayne Steinberg hold after this Form 4?

After the reported transaction, Jeremy Rayne Steinberg holds 25,375 shares of Boost Run Class A Common Stock directly. This entire amount reflects the shares acquired in the May 12, 2026 transaction disclosed in the Form 4 filing.

Was the Boost Run (BRUN) insider transaction an open-market buy or another type?

The transaction was not an open-market purchase. It is coded as an exercise or conversion of a derivative security, with shares received as member distributions from Willow Lane Sponsor, LLC, according to the footnote in the Form 4 filing.

What role does Willow Lane Sponsor, LLC play in the Boost Run (BRUN) insider transaction?

The Form 4 notes that the 25,375 shares acquired by Jeremy Rayne Steinberg were received as member distributions from Willow Lane Sponsor, LLC. This indicates the shares came via distributions from that entity rather than direct market purchases.

What does transaction code "M" mean in the Boost Run (BRUN) Form 4?

Transaction code “M” indicates an exercise or conversion of a derivative security. In this Boost Run filing, it shows Jeremy Rayne Steinberg acquired 25,375 Class A Common shares through such a derivative-related event, with a reported per-share transaction price of $0.00.