STOCK TITAN

Boost Run holder sells 500K shares at $14

Director-affiliated SPV and its managing member now report an 8.88% stake in Boost Run Inc. after a 500,000-share open-market sale at $14.

(Moderate)
(Neutral)
Form Type
SCHEDULE 13D/A

Rhea-AI Filing Summary

Boost Run Inc. (BRUN) received an amended Schedule 13D (Amendment No. 2) from Sean Goodrich and Goodrich ILMJS LLC, reporting changes in their holdings and related arrangements. On September 14, 2026, they sold 500,000 shares of Class A Common Stock in an open-market transaction at $14.00 per share.

After this sale, the reporting persons may be deemed to beneficially own 4,437,921 shares of Class A Common Stock, or 8.88% of the outstanding class, based on 49,954,423 shares outstanding as of August 17, 2026. The filing also details prior founder share and warrant purchases, registration rights, an earnout of 1,968,750 shares tied to VWAP price thresholds, and various related agreements tied to the business combination structure.

Positive

  • None.

Negative

  • None.

Filing Explained

The filing states that all 1,968,750 earnout shares were issued to the SPV on June 11, 2026, making the earnout a completed issuance rather than a remaining contingent entitlement.

Shares beneficially owned 4,437,921 shares Class A Common Stock beneficially owned by the reporting persons as of September 14, 2026
Beneficial ownership percentage 8.88% Portion of Boost Run Inc. Class A Common Stock outstanding held by the reporting persons
Shares outstanding 49,954,423 shares Boost Run Inc. Class A Common Stock outstanding as of August 17, 2026
Recent share sale 500,000 shares at $14.00 per share Open-market sale on September 14, 2026 by the reporting persons
Earnout shares issued 1,968,750 shares SPV Earnout Shares of Class A Common Stock issued to the SPV on June 11, 2026
Founder Shares purchased 1,272,885 shares at $1.75 per share Founder Shares bought by the SPV from the Sponsor on September 15, 2025
Aggregate Founder Share purchase price $2,227,548.75 Total paid by the SPV for Founder Shares under the Transfer Agreement
Private Warrants purchased 1,101,986 warrants Private Warrants acquired by the SPV from the Sponsor on September 15, 2025
beneficially own financial
"may be deemed to beneficially own 4,437,921 shares of Class A Common Stock"
Beneficially own means having the economic rights and risks of a security—such as the right to receive dividends, sell the shares, or profit from price changes—whether or not your name appears on the official share register. Think of it like renting a car: you use it and reap the benefits even if the title lists someone else. Investors care because beneficial ownership determines who truly controls value, must be disclosed under securities rules, and can signal potential influence or trading activity that affects a stock’s price.
Registration Rights Agreement regulatory
"the SPV entered into a Registration Rights Agreement with the Company"
A registration rights agreement is a contract that gives investors the option to have their ownership stakes officially registered with the government, making it easier to sell their shares later. This agreement matters because it provides investors with a clearer path to cash out their investments if they choose, offering more liquidity and confidence in their ability to sell their holdings when desired.
Earnout Agreement financial
"the SPV entered into the Earnout Agreement, pursuant to which the SPV was entitled"
VWAP financial
"based upon the Class A Common Stock achieving VWAP performance thresholds"
VWAP, or Volume-Weighted Average Price, is a way to find the average price of a stock throughout the trading day, giving more importance to times when more shares are traded. It helps traders see the typical price and decide whether a stock is expensive or cheap compared to its average, similar to finding the average speed during a trip by giving more weight to times when you traveled faster or slower.
Founder Shares financial
"the SPV purchased from the Sponsor 1,272,885 Founder Shares"
Founder shares are the ownership stakes given to the people who start a company, often with extra voting power or protections compared with ordinary shares. For investors, they matter because founders’ control and incentives influence decisions about strategy, hiring, and whether the company sells or stays independent — like a family that keeps majority voting rights in a household decision. High founder ownership can mean stable leadership but also a risk that outside shareholders have less influence.
Private Warrants financial
"and 1,101,986 Private Warrants (representing 27.5% of the Sponsor's 4,007,222 Private Warrants)"
A private warrant is a contract sold directly to selected investors that gives the holder the right to buy a company’s stock at a fixed price in the future. Think of it as a coupon for shares that isn’t offered on public markets: it can provide the company with future cash if exercised but can also dilute existing shareholders by increasing the number of outstanding shares, so investors watch exercise price, expiration and transfer restrictions closely.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What ownership stake in BRUN does Sean Goodrich now report?

The filing states that Sean Goodrich and Goodrich ILMJS LLC may be deemed to beneficially own 4,437,921 shares of Boost Run Inc. Class A Common Stock, representing approximately 8.88% of the outstanding Class A shares, based on 49,954,423 shares outstanding as of August 17, 2026.

What transaction did the BRUN Schedule 13D/A disclose on September 14, 2026?

On September 14, 2026, the reporting persons sold 500,000 shares of Boost Run Inc. Class A Common Stock in an open market transaction at a price of $14.00 per share. The filing states these shares were sold for investment purposes in the ordinary course.

How many Boost Run Inc. shares are used as the outstanding base for the 8.88% figure?

The 8.88% beneficial ownership is calculated using 49,954,423 shares of Boost Run Inc. Class A Common Stock outstanding as of August 17, 2026, as reported in the company’s Quarterly Report on Form 10-Q filed on August 18, 2026.

What ongoing rights does the SPV have regarding BRUN securities?

In connection with the business combination, the SPV entered into a Registration Rights Agreement giving it demand and piggyback registration rights for its securities. The SPV is also subject to certain transfer restrictions and other provisions under a Letter Agreement and its amendment.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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09940T100

(CUSIP Number)
Boost Run Inc.
5 Revere Drive, Suite 200,,
Northbrook, IL, 60062
(847) 489-3367

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)
09/14/2026

(Date of Event Which Requires Filing of This Statement)


If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).




schemaVersion:


SCHEDULE 13D




Comment for Type of Reporting Person:
(1) In reference to Items 7, 9 and 11, represents 4,437,921 shares of Class A Common Stock held by the SPV. Mr. Goodrich, as managing member of the SPV, holds voting and investment discretion over such securities. (2) In reference to Item 13, based on a total of 49,954,423 shares of Class A Common Stock of the Issuer as of August 17, 2026 reported in the Issuer's Quarterly Report on Form 10-Q filed on August 18, 2026 with the Securities and Exchange Commission.


SCHEDULE 13D




Comment for Type of Reporting Person:
(3) In reference to Items 7, 9 and 11, consists of 4,437,921 shares of Class A Common Stock held directly by the SPV. Mr. Goodrich, as managing member of the SPV, directs voting and dispositive decisions with respect to securities held by the SPV. (4) In reference to Item 13, based on a total of 49,954,423 shares of Class A Common Stock of the Issuer as of August 17, 2026 reported in the Issuer's Quarterly Report on Form 10-Q filed on August 18, 2026 with the Securities and Exchange Commission.


SCHEDULE 13D


Sean Goodrich
Signature:/s/ Sean Goodrich
Name/Title:Sean Goodrich
Date:09/16/2026
Goodrich ILMJS LLC
Signature:/s/ Sean Goodrich
Name/Title:Sean Goodrich/Managing Member
Date:09/16/2026

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