$BRUN

$8.11 +$0.63 (8.42%) Close

$BRUN Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 79.5M shares outstanding

Who owns BRUN?

By type of holder

Institutions 20.1% Insiders 0.0% Everyone else 79.9%

Concentration Top 10 holders own 80.8%

Andrew Karos 37.2% · A23 Revocable Trust No.1, Dated January 26, 2026 10.1%

Institutional ownership

20.1%

+20.1 pts vs last qtr

Institutional holders

+80 vs last qtr

Net shares bought

+16.0M

by institutions in Q2 2026

New / sold out

80 / 0

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

TOMS Capital Investment Management LP NEW +3.1M
FMR LLC NEW +1.8M

Biggest sellers in Q2 2026

None.

Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for Boost Run Inc in the last 12 months.

Is your stake being diluted?

There are not yet two fiscal years of reported share counts for Boost Run Inc.

How patient are the owners?

Institutional shares by how long they've been held

5+ years0% 3–5 years0% 1–3 years0% Under 1 year100%

Quarterly turnover

—

of institutional shares changed hands

Top 10 managers, median time held

0 quarters

Super Investors

Investment managers reporting BRUN on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
TC TOMS Capital Investment Management LP	3.1M	3.93%	NEW	Q2 '26	2.6%
Shares held by quarter Peak holding3.1M (Q2'26) Change over 8 quarters+3.1M Share of the company3.930% TOMS Capital Investment Management LP's full portfolio →
F FMR LLC	1.8M	2.24%	NEW	Q2 '26	0.0%
Shares held by quarter Peak holding1.8M (Q2'26) Change over 8 quarters+1.8M Share of the company2.240% FMR LLC's full portfolio →

TOMS Capital Investment Management LP

3.1M

% of company

3.93%

Change vs last qtr

NEW

Held since

Q2 '26

FMR LLC

1.8M

% of company

2.24%

Change vs last qtr

NEW

Held since

Q2 '26

23 more super investors behind a free account

See every manager holding Boost Run Inc, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting BRUN on Form N-PORT; together they hold 3.7% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
FS Fidelity Stock Selector Small Cap Fund Fidelity Capital Trust	$8.22M	410.2K	0.52%	0.11%	July 31, 2026
SA Strategic Advisers Fidelity U.S. Total Stock Fund Fidelity Rutland Square Trust II	$7.45M	427.3K	0.54%	0.00%	August 31, 2026

Fidelity Stock Selector Small Cap Fund

Fidelity Capital Trust

Position value

$8.22M

% of company

0.52%

% of the fund

0.11%

As of

July 31, 2026

Strategic Advisers Fidelity U.S. Total Stock Fund

Fidelity Rutland Square Trust II

Position value

$7.45M

% of company

0.54%

% of the fund

0.00%

As of

August 31, 2026

21 more funds behind a free account

See every fund holding Boost Run Inc and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
AK Andrew Karos 5%+ holder 13D · 48.1%	29.5M	37.15%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company37.150% Disclosed stake13D · 48.1% View the 13D/G filing →
AR A23 Revocable Trust No.1, Dated January 26, 2026 5%+ holder 13D · 25.1%	8.0M	10.08%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company10.080% Disclosed stake13D · 25.1% View the 13D/G filing →

Andrew Karos

5%+ holder13D · 48.1%

29.5M

% of company

37.15%

Change vs last qtr

—

Held since

—

A23 Revocable Trust No.1, Dated January 26, 2026

5%+ holder13D · 25.1%

8.0M

% of company

10.08%

Change vs last qtr

—

Held since

—

5 more holders behind a free account

See every insider and 5%+ holder of Boost Run Inc.

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