SEC ownership of Boost Run Inc.

Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0002090646.

Comparable stake leader

B. Luke Weil

Disclosed value leader

Sean Goodrich

Comparable rows

50/50

Latest evidence

19 Aug 2026

Top shareholders Insider holders Latest transactions

Public ticker: BRUN, BRUNW on Nasdaq
Parsed ownership sources: 13D/G, 3/4/5, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
Largest SEC-reported holder: B. Luke Weil
Ranking: Comparable ownership first, then disclosed value
Comparable ownership rows: 50 of 50
Meaning: Rows with safely comparable ownership %
Latest 13D/G holder: B. Luke Weil
Source: Latest parsed Schedule 13D/G stake
Latest parsed ownership date: 19 Aug 2026
Freshness: Most recent filing date in this holder set
Issuer CIK: 0002090646
Issuer location: Northbrook, IL

Ownership snapshot

Top shareholders of Boost Run Inc. (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader

B. Luke Weil

Disclosed value leader

Sean Goodrich

Comparable rows

50/50

Latest evidence

19 Aug 2026

13D/G 3/4/5 13F Lead comparable stake: 12% 13D/G row: B. Luke Weil Showing 1-8 of 50 holder rows.

Quick read

B. Luke Weil leads the comparable SEC ownership view at 12%.

50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens B. Luke Weil's linked filing trail.

Comparable ownership Top 5

B. Luke Weil 12%

Sean Goodrich 10%

TOMS Capital Investment Managemen... 9.8%

FMR LLC 5.6%

Jeremy Rayne Steinberg 0.05%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-8 of 50 holder rows

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
B. Luke Weil	13D/G 3/4/5 Director, 10%+ Owner 13D/G 3/4/5	12%	$82,026,483 3,906,023 shares	$0	12 May 2026
Sean Goodrich	3/4/5 13D/G Director 3/4/5 13D/G	10% from 13D/G	$298,831,964 10,074,042 shares	-$3,993,730	19 Aug 2026
TOMS Capital Investment Management LP	13F 13D/G Company 13F 13D/G	9.8% from 13D/G	$121,281,250 3,125,000 shares	—	30 Jun 2026
FMR LLC	13F 13D/G Company 13F 13D/G	5.6% from 13D/G	$69,169,122 1,782,250 shares	—	30 Jun 2026
Jeremy Rayne Steinberg	3/4/5 Director 3/4/5	0.05%	$835,091 25,375 shares	—	12 May 2026
CITADEL ADVISORS LLC	13F Company 13F	2.6%	$51,257,221 1,320,722 shares	—	30 Jun 2026
D. E. Shaw & Co., Inc.	13F Company 13F	2.5%	$48,533,690 1,250,546 shares	—	30 Jun 2026
AWM Investment Company, Inc.	13F Company 13F	1.6%	$31,581,211 813,739 shares	—	30 Jun 2026

How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Forms 3/4/5 flow

Insider trading overview

Net insider flow leans to selling over the last 12 months. Net value: -$3,993,730.

Buys

Insiders: 0

Sells

$3,993,730

Insiders: 1

Net

-$3,993,730

Shares: -198,200

Window

Last 12 months

4 rolling buckets

Buy value Sell value

Shares: 0 Shares: 198,200

Window (months)	Sell shares	Buy value	Sell value	Net value
0-3	198,200	$0	$3,993,730	-$3,993,730
3-6	0	$0	$0	$0
6-9	0	$0	$0	$0
9-12	0	$0	$0	$0

Reporting owners

Insider holders from Forms 3/4/5

Showing 1-9 of 9 reporting-owner rows connected to Boost Run Inc.. Open a relationship link for the CIK-to-CIK filing trail.

Rows

Largest Forms 3/4/5 holder

Sean Goodrich

Net 12M change

-$3,993,730

Latest report

19 Aug 2026

Name	Relationship	Holdings Value	Past Year Net Change	Change %	Valuation	Report Date
Sean Goodrich	Director	$298,831,964	-$3,993,730	-1.3%	Mixed	19 Aug 2026
Jeremy Rayne Steinberg	Director	$835,091			Mixed	12 May 2026
Harilaos Georgakopoulos	Chief Operating Officer, Director, 10%+ Owner				Mixed	08 May 2026
Jeffrey Kleinops	Director				Mixed	08 May 2026
Ryan Matthew Burke	Director				Mixed	08 May 2026
A23 Revocable Trust No.1, Dated January 26, 2026	10%+ Owner				Mixed	08 May 2026
B. Luke Weil	Director, 10%+ Owner				Mixed	12 May 2026
Andrew Karos	Chief Executive Officer, Director, 10%+ Owner				Mixed	08 May 2026
Erik Guckel	Chief Financial Officer				Mixed	08 May 2026

Recent insider transactions for Boost Run Inc.

Showing up to 300 recent insider transactions from the last 12 months.

Insider	Symbol	Class	Transaction	%	SEC-reported value	SEC-reported price	Shares	Shares owned	Date	Ownership
Sean Goodrich	BRUN	Class A Common Stock	Sale	-3.86%	$3,993,730	$20.15	-198,200	4,937,921	27 Aug 2026	By Goodrich ILJMS LLC
Sean Goodrich	BRUN	Class A Common Stock	Options Exercise	27.3%			1,101,986	5,136,121	19 Aug 2026	By Goodrich ILMJS LLC
Sean Goodrich	BRUN	Warrants	Options Exercise	-100%			-1,101,986	0	19 Aug 2026	By Goodrich ILMJS LLC
Sean Goodrich	BRUN	Class A Common Stock	Options Exercise	95.3%			1,968,750	4,034,135	09 Jun 2026	By Goodrich ILJMS LLC
Jeremy Rayne Steinberg	BRUN	Class A Common Stock	Options Exercise				25,375	25,375	12 May 2026	Direct
B. Luke Weil	BRUN	Class A Common Stock	Options Exercise	-27.5%			-1,272,885	3,355,789	12 May 2026	By Willow Lane Sponsor, LLC
B. Luke Weil	BRUN	Warrants	Disposed to Issuer	-27.5%			-1,101,986	2,905,236	12 May 2026	By Willow Lane Sponsor, LLC

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

SEC ownership of Boost Run Inc.

Top shareholders of Boost Run Inc. (13F + 13D/G + 3/4/5)

B. Luke Weil leads the comparable SEC ownership view at 12%.

Insider trading overview

Insider holders from Forms 3/4/5

Continue from Boost Run Inc. ownership

Recent insider transactions for Boost Run Inc.