Erik Guckel - 29 Sep 2026 Form 4 Insider Report for Boost Run Inc. (BRUN)

Reporting relationship: Chief Financial Officer
Issuer ticker: BRUN
Reported as of: 29 Sep 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 01 Oct 2026, 16:30:28 UTC
Prior SEC filing: 15 May 2026
Source filing: View source filing
Reporting owner signature: /s/ Erik Guckel

Key filing fact

Erik Guckel filed Form 4 for Boost Run Inc. (BRUN) on 01 Oct 2026.

Key facts

This page summarizes Erik Guckel's Form 4 filing for Boost Run Inc. (BRUN).
1 reported transaction and 1 derivative row are listed below.
Accepted by SEC: 01 Oct 2026, 16:30.

Change

Previous filing in this sequence was filed on 15 May 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002130282 Primary reporting owner

Guckel Erik

Relationship: Chief Financial Officer
Address: C/O BOOST RUN INC., 5 REVERE DRIVE, SUITE 200, NORTHBROOK
Signature: /s/ Erik Guckel
Signature date: 01 Oct 2026

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

BRUN transaction Derivative

Restricted Stock Units

Award

Transaction value
Shares: +2,890,000
Change %
Price: $0.000000^*
Shares after: 2,890,000
Date: 29 Sep 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 2,890,000
Exercise price
Footnotes: F1, F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

Each restricted stock unit represents a contingent right to receive one share of common stock of Boost Run Inc.

Footnote F2

On September 29, 2026, the reporting person was granted 2,890,000 restricted stock units, of which 40% will vest on May 15, 2027. The remaining 60% will vest in eight substantially equal installments on each of September 15, 2027, December 15, 2027, March 15, 2028, June 15, 2028, September 15, 2028, December 15, 2028, March 15, 2029, and June 15, 2029, in each case, subject to continued service.