OS Therapies OSTX Institutional Ownership

NYSE OSTX

$1.29 +0.03 (+2.38%)

As of: Oct 21, 2026 · 3:59 PM EDT

Institutions by Trading Activity

30 Institutions

Increased 21 70.0%

Unchanged 5 16.7%

Reduced 4 13.3%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

6.40%

▼-0.98 pp QoQ

Shares Held by Institutions

2.90Mn

of 45.28Mn outstanding

▼-0.05% QoQ

Shares Outstanding

45.28Mn

42.39Mn held outside 13F filers

Institutional Investors

filed 13F for Jun 2026

▲+1 vs prior quarter

Net Shares Added (QoQ)

-1.50K

distributed since last quarter

Value of Holdings

$3.65Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Updated Oct 10, 2026

OS Therapies Inc (NYSE:OSTX) appeared in the 13F filings of 30 institutional investors for the quarter ended June 30, 2026.

Their combined stake equaled 6.40% of outstanding shares in Q2 2026, down from 7.38% in Q1 2026.
Total shares held in OSTX fell 0.05% from Q1 2026; the number of holders rose 150.00% from Q2 2025.
Of these 30 holders, 21 added to their positions, 4 reduced their stakes and 5 left their positions unchanged.
The aggregate institutional position in OS Therapies was 2.9Mn shares at the end of Q2 2026, down 1.5K from the prior quarter and up 2.29Mn from a year earlier.
As of June 30, 2026, Vanguard Capital Management LLC held the largest stake in OS Therapies with 777.65K shares, or 1.72% of shares outstanding.
The biggest increases in OSTX positions during Q2 2026 came from Vanguard Capital Management LLC (+308.18K shares), BlackRock, Inc. (+177.71K shares), HighTower Advisors, LLC (+70.35K shares), Vanguard Fiduciary Trust Co (+57.47K shares) and State Street Corp (+28.9K shares).
On the other side, among holders that kept a position in OS Therapies, the largest reductions in Q2 2026 came from Susquehanna International Group, LLP (-435.2K shares), UBS Group AG (-339.87K shares), Jane Street Group, LLC (-13.32K shares) and Mercer Global Advisors Inc (-10.09K shares).
Per Business Quant data, the 10 largest holders of OS Therapies at the end of Q2 2026 were Vanguard Capital Management LLC (777.65K shares), CM Management, LLC (400K shares), Geode Capital Management, LLC (301.79K shares), Howard Financial Services, LTD. (248K shares), BlackRock, Inc. (242.48K shares), Vanguard Fiduciary Trust Co (174.13K shares), State Street Corp (120.1K shares), Marshall Wace, LLP (100.64K shares), HighTower Advisors, LLC (85.55K shares) and Northern Trust Corp (70.82K shares).

Form 13F Holdings

30 Institutional Holders

Report period 30 Jun, 2026

Total shares held 2.90Mn

Of outstanding 6.40%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	777,651	1.72%	▲308,184	+65.65%	$1.48Mn
2	CM Management, LLC	0001841857	400,000	0.88%	0	0.00%	$760.00K
3	GEODE CAPITAL MANAGEMENT, LLC	0001214717	301,794	0.67%	▲21,749	+7.77%	$573.41K
4	HOWARD FINANCIAL SERVICES, LTD.	0001768130	248,001	0.55%	▲2,565	+1.05%	$471.20K
5	BlackRock, Inc.	0002012383	242,479	0.54%	▲177,707	+274.36%	$460.71K
6	VANGUARD FIDUCIARY TRUST CO	0000933478	174,132	0.38%	▲57,469	+49.26%	$330.85K
7	State Street Corp	0000093751	120,100	0.27%	▲28,900	+31.69%	$228.19K
8	MARSHALL WACE, LLP	0001318757	100,640	0.22%	▲100,640	0.00%	$191.22K
9	HighTower Advisors, LLC	0001462245	85,550	0.19%	▲70,350	+462.83%	$162.55K
10	Northern Trust Corp	0000073124	70,817	0.16%	▲4,763	+7.21%	$134.55K
11	Beacon Pointe Advisors, LLC	0001744317	62,507	0.14%	0	0.00%	$118.76K
12	BRIDGEWAY CAPITAL MANAGEMENT, LLC	0001107261	45,000	0.10%	▲20,000	+80.00%	$85.50K
13	INGALLS & SNYDER LLC	0001041885	36,676	0.08%	0	0.00%	$70
14	TWO SIGMA INVESTMENTS, LP	0001179392	30,414	0.07%	▲4,034	+15.29%	$57.79K
15	Stifel Financial Corp	0000720672	27,900	0.06%	▲12,900	+86.00%	$53.01K
16	JANE STREET GROUP, LLC	0001595888	26,999	0.06%	▼13,317	-33.03%	$51.30K
17	AXQ CAPITAL, LP	0001916908	24,623	0.05%	▲24,623	0.00%	$46.78K
18	Vanguard Global Advisers, LLC	0001811242	20,958	0.05%	0	0.00%	$39.82K
19	Stratos Wealth Advisors, LLC	0001707202	19,314	0.04%	▲5,497	+39.78%	$36.70K
20	Quadrature Capital Ltd	0001651424	15,662	0.03%	▲15,662	0.00%	$29.76K

Showing 1 to 20 of 30 holders