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OSTX · AMEX · Biotechnology

OS Therapies (OSTX)

Develops Listeria immunotherapy for recurrent metastatic osteosarcoma after surgery.

$1.75

Pre-market+0.04 (+2.04%)

At close$1.72(+3.31%)

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Breakdown13F · 13D/G · Form 4

	Institutions30 holders · as of Jun 30, 2026	6.28%	2.90M shares
	Otherremainder	93.72%	43.23M shares

46.13M company shares as of Sep 3, 2026 · institutions as of Jun 30, 2026 · holders as of their latest filing

Top shareholders13F · 13D/G · Form 4

Holder	Stake	Shares	Evidence
Vanguard Capital Management LLCInstitution	1.69%	777,651	13Fas of Jun 30, 2026
CM Management, LLCInstitution	0.87%	400,000	13Fas of Jun 30, 2026
Geode Capital Management, LLCInstitution	0.65%	301,794	13Fas of Jun 30, 2026
Howard Financial Services, Ltd.Institution	0.54%	248,001	13Fas of Jun 30, 2026
BlackRock, Inc.Institution	0.53%	242,479	13Fas of Jun 30, 2026
Vanguard Fiduciary Trust CoInstitution	0.38%	174,132	13Fas of Jun 30, 2026
State Street CorpInstitution	0.26%	120,100	13Fas of Jun 30, 2026
Marshall Wace, LLPInstitution	0.22%	100,640	13Fas of Jun 30, 2026
Hightower Advisors, LLCInstitution	0.19%	85,550	13Fas of Jun 30, 2026
Northern Trust CorpInstitution	0.15%	70,817	13Fas of Jun 30, 2026
Beacon Pointe Advisors, LLCInstitution	0.14%	62,507	13Fas of Jun 30, 2026
Bridgeway Capital Management, LLCInstitution	0.10%	45,000	13Fas of Jun 30, 2026
Ingalls & Snyder LLCInstitution	0.08%	36,676	13Fas of Jun 30, 2026
Two Sigma Investments, LPInstitution	0.07%	30,414	13Fas of Jun 30, 2026
Stifel Financial CorpInstitution	0.06%	27,900	13Fas of Jun 30, 2026
Jane Street Group, LLCInstitution	0.06%	26,999	13Fas of Jun 30, 2026
Axq Capital, LPInstitution	0.05%	24,623	13Fas of Jun 30, 2026
Vanguard Global Advisers, LLCInstitution	0.05%	20,958	13Fas of Jun 30, 2026
Stratos Wealth Advisors, LLCInstitution	0.04%	19,314	13Fas of Jun 30, 2026
Quadrature Capital LtdInstitution	0.03%	15,662	13Fas of Jun 30, 2026
Jones Financial Companies LLLPInstitution	0.03%	14,501	13Fas of Jun 30, 2026
Susquehanna International Group, LLPInstitution	0.03%	13,532	13Fas of Jun 30, 2026
Morgan StanleyInstitution	0.03%	13,000	13Fas of Jun 30, 2026
UBS Group AGInstitution	0.02%	8,813	13Fas of Jun 30, 2026
Rockefeller Capital Management L.P.Institution	0.02%	7,500	13Fas of Jun 30, 2026

13F — a manager's quarterly holdings

Institutions13F, as of Jun 30, 2026

30 holders · 2.90M shares · 6 new positions · 21 increased · 4 reduced · 5 closed

Holder	Shares	% outstanding	Chg q/q	Filed
Vanguard Capital Management LLC	777.7K	1.69%	+308.2K	Aug 13, 2026
CM Management, LLC	400.0K	0.87%	0	Aug 13, 2026
Geode Capital Management, LLC	301.8K	0.65%	+21.7K	Aug 12, 2026
Howard Financial Services, Ltd.	248.0K	0.54%	+2.6K	Jul 7, 2026
BlackRock, Inc.	242.5K	0.53%	+177.7K	Aug 7, 2026
Vanguard Fiduciary Trust Co	174.1K	0.38%	+57.5K	Aug 13, 2026
State Street Corp	120.1K	0.26%	+28.9K	Aug 7, 2026
Marshall Wace, LLP	100.6K	0.22%	+100.6K	Aug 13, 2026

Ownership statements13D/G · 5% or more, as filed

Holder	% of class	Shares	Form	Filed
Ayala Pharmaceuticals, Inc.	9.99%	2.16M	13G	Apr 16, 2025 ↗
Thomas A. Satterfield, Jr.	9.40%	3.12M	13G	Aug 13, 2025 ↗
Shalom Auerbach	8.50%	2.68M	13D	Aug 18, 2025 ↗

OS Therapies (OSTX)

Breakdown13F · 13D/G · Form 4

Top shareholders13F · 13D/G · Form 4

Institutions13F, as of Jun 30, 2026

Ownership statements13D/G · 5% or more, as filed

Insider tradesForm 4

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