$OSTX

$1.21 -$0.04 (3.2%) Close

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

Ownership

13F as of Q2 2026 · 46.1M shares outstanding

Who owns OSTX?

By type of holder

Institutions 6.3% Insiders 8.6% Everyone else 85.1%

Concentration Top 10 holders own 22.7%

Shalom Auerbach 5.8% · Einodmil LLC 5.8%

Institutional ownership

6.3%

-0.0 pts vs last qtr

Institutional holders

-1 vs last qtr

Net shares bought

−15.2K

by institutions in Q2 2026

New / sold out

6 / 7

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Vanguard Capital Management LLC +308.2K
BlackRock, Inc. +177.7K

Biggest sellers in Q2 2026

Susquehanna International Group, LLP SOLD OUT −448.7K
UBS Group AG −339.9K

Who is planning to sell?

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

Is your stake being diluted?

Diluted share count, FY2024–FY2025

+320.9%

+320.90% a year

Each share's claim on the business

−76.2%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $4.53M

over 2 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years0% 3–5 years0% 1–3 years27% Under 1 year73%

Quarterly turnover

30.5%

of institutional shares changed hands

Top 10 managers, median time held

3 quarters

Super Investors

Investment managers reporting OSTX on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
VC Vanguard Capital Management LLC	777.7K	1.69%	+308.2K (+65.6%)	Q3 '25	0.0%
Shares held by quarter Peak holding777.7K (Q2'26) Change over 8 quarters+777.7K Share of the company1.690% Vanguard Capital Management LLC's full portfolio →
SI Susquehanna International Group, LLP	—	—	SOLD OUT	—	—
Shares held by quarter Peak holding448.7K (Q1'26) Change over 8 quarters0 Susquehanna International Group, LLP's full portfolio →

Vanguard Capital Management LLC

777.7K

% of company

1.69%

Change vs last qtr

+308.2K (+65.6%)

Held since

Q3 '25

Susquehanna International Group, LLP

—

% of company

—

Change vs last qtr

SOLD OUT

Held since

—

28 more super investors behind a free account

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

Institutional Funds

Mutual funds and ETFs reporting OSTX on Form N-PORT; together they hold 2.6% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$791K	416.1K	0.90%	0.00%	June 30, 2026
VE Vanguard Extended Market Index Fund Vanguard Index Funds	$687K	361.5K	0.78%	0.00%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$791K

% of company

0.90%

% of the fund

0.00%

As of

June 30, 2026

Vanguard Extended Market Index Fund

Vanguard Index Funds

Position value

$687K

% of company

0.78%

% of the fund

0.00%

As of

June 30, 2026

8 more funds behind a free account

See every fund holding OS Therapies 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
SA Shalom Auerbach 5%+ holder 13D · 8.5%	2.7M	5.80%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company5.800% Disclosed stake13D · 8.5% View the 13D/G filing →
E Einodmil LLC 5%+ holder 13D · 8.4%	2.7M	5.75%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company5.750% Disclosed stake13D · 8.4% View the 13D/G filing →

Shalom Auerbach

5%+ holder13D · 8.5%

2.7M

% of company

5.80%

Change vs last qtr

—

Held since

—

Einodmil LLC

5%+ holder13D · 8.4%

2.7M

% of company

5.75%

Change vs last qtr

—

Held since

—

9 more holders behind a free account

See every insider and 5%+ holder of OS Therapies Inc.

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