OS Therapies Inc (OSTX) — Institutional Holders, Q2 2026
29 institutional investment managers reported a OSTX position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $6.0M. Every filer is listed below, ranked by position value. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.
OSTX in Q2 2026: what funds did
Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.
Biggest buyers
- VANGUARD CAPITAL MANAGEMENTAdded · +308,184 sh+$585.5K
- HOWARD FINANCIAL SERVICES, LTD.Added · +250,566 sh+$476.1K
- BlackRockAdded · +177,707 sh+$337.6K
- MARSHALL WACE, LLPNew · +100,640 sh+$191.2K
- HighTower AdvisorsAdded · +70,350 sh+$133.7K
Biggest sellers
- SUSQUEHANNA INTERNATIONAL GROUP, LLPTrimmed · -435,205 sh-$826.9K
- UBS Group AGTrimmed · -339,865 sh-$645.7K
- SANDERS MORRIS HARRISSold out · -32,000 sh-$60.8K
- XTX Topco LtdSold out · -31,622 sh-$60.1K
- JANE STREET GROUPTrimmed · -13,317 sh-$25.3K
OSTX 13F holders ranked 1–29 of 29
| # | Institution | Shares | Value | % of portfolio | QoQShares vs Q1 2026 |
|---|---|---|---|---|---|
| 1 | VANGUARD CAPITAL MANAGEMENT#1 · 777,651 sh | 777,651 | $1.5M | 0.00% | +65.6% |
| 2 | HOWARD FINANCIAL SERVICES, LTD.#2 · 496,002 sh | 496,002 | $942.4K | — | +102.1% |
| 3 | CM Management#3 · 400,000 sh | 400,000 | $760.0K | 0.48% | 0.0% |
| 4 | GEODE CAPITAL MANAGEMENT#4 · 301,794 sh | 301,794 | $573.4K | 0.00% | +7.8% |
| 5 | BlackRock#5 · 242,479 sh | 242,479 | $460.7K | 0.00% | +274.4% |
| 6 | VANGUARD FIDUCIARY#6 · 174,132 sh | 174,132 | $330.9K | <0.01% | +49.3% |
| 7 | STATE STREET#7 · 120,100 sh | 120,100 | $228.2K | 0.00% | +31.7% |
| 8 | MARSHALL WACE, LLP#8 · 100,640 sh | 100,640 | $191.2K | <0.01% | New |
| 9 | HighTower Advisors#9 · 85,550 sh | 85,550 | $162.5K | <0.01% | +462.8% |
| 10 | NORTHERN#10 · 70,817 sh | 70,817 | $134.6K | 0.00% | +7.2% |
| 11 | Beacon Pointe Advisors#11 · 62,507 sh | 62,507 | $118.8K | <0.01% | 0.0% |
| 12 | BRIDGEWAY CAPITAL MANAGEMENT#12 · 45,000 sh | 45,000 | $85.5K | <0.01% | +80.0% |
| 13 | INGALLS & SNYDER#13 · 36,676 sh | 36,676 | $70.0K | <0.01% | 0.0% |
| 14 | TWO SIGMA INVESTMENTS#14 · 30,414 sh | 30,414 | $57.8K | 0.00% | +15.3% |
| 15 | STIFEL FINANCIAL#15 · 27,900 sh | 27,900 | $53.0K | 0.00% | +86.0% |
| 16 | JANE STREET GROUP#16 · 26,999 sh | 26,999 | $51.3K | 0.00% | -33.0% |
| 17 | AXQ CAPITAL#17 · 24,623 sh | 24,623 | $46.8K | <0.01% | New |
| 18 | Vanguard Global Advisers#18 · 20,958 sh | 20,958 | $39.8K | 0.00% | 0.0% |
| 19 | Stratos Wealth Advisors#19 · 19,314 sh | 19,314 | $36.7K | <0.01% | +39.8% |
| 20 | Quadrature Capital Ltd#20 · 15,662 sh | 15,662 | $29.8K | <0.01% | New |
| 21 | JONES FINANCIAL COMPANIES LLLP#21 · 14,501 sh | 14,501 | $27.3K | 0.00% | +12.2% |
| 22 | SUSQUEHANNA INTERNATIONAL GROUP, LLP#22 · 13,532 sh | 13,532 | $25.7K | 0.00% | -97.0% |
| 23 | MORGAN STANLEY#23 · 13,000 sh | 13,000 | $24.7K | 0.00% | +37.0% |
| 24 | UBS Group AG#24 · 8,813 sh | 8,813 | $16.7K | 0.00% | -97.5% |
| 25 | Rockefeller Capital Management L.P.#25 · 7,500 sh | 7,500 | $14.3K | 0.00% | New |
| 26 | Steward Partners Investment Advisory#26 · 5,681 sh | 5,681 | $10.8K | <0.01% | New |
| 27 | BARCLAYS PLC#27 · 1,534 sh | 1,534 | $2.9K | 0.00% | New |
| 28 | ARMSTRONG ADVISORY GROUP#28 · 100 sh | 100 | $190.00 | — | 0.0% |
| 29 | Caitong International Asset Management , Ltd#29 · 63 sh | 63 | $120.00 | 0.00% | +270.6% |
Funds that sold out of OSTX in Q2 2026 (6)
Held OSTX at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.
| Institution | Shares sold | Value in Q1 2026 |
|---|---|---|
| SANDERS MORRIS HARRIS32,000 sh | 32,000 | $45.1K |
| XTX Topco Ltd31,622 sh | 31,622 | $44.6K |
| MERCER GLOBAL ADVISORS10,220 sh | 10,220 | $14.4K |
| LPL Financial10,113 sh | 10,113 | $14.3K |
| Tower Research Capital (TRC)4,179 sh | 4,179 | $5.9K |
| FMR2 sh | 2 | $2.00 |
Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.