OSTXNYSEPharmaceutical PreparationsFiscal year ends December 31
OS Therapies Inc
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 14, 2026
$1.27−0.05 (-3.79%)
Close on Oct 19, 2026
- Market cap
- $55.76M
- P/E (TTM)
- –
- Dividend yield
- –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
6.3%
3M of 46M shares
Institutional holders
29
6 new, 6 sold out
Net institutional buying
-0M
In Q2 2026
Insider trades, 12 months
0 buys · 0 sales
Open-market trades only
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| Thomas A. Satterfield, Jr. | 3,115,681 | 9.40% | 13G (passive) amendment | Jun 30, 2025 |
| Shalom Auerbach | 2,677,570 | 8.50% | 13D (active) amendment | Jul 29, 2025 |
| Ayala Pharmaceuticals, Inc. | 2,164,215 | 9.99% | 13G (passive) | Apr 9, 2025 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of OSTX | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| Vanguard Capital Management LLC | 777,651 | 1.69% | $1.48M | +308,184 | 0.00% |
| CM Management, LLC | 400,000 | 0.87% | $760.00K | – | 0.51% |
| Geode Capital Management, LLC | 301,794 | 0.65% | $573.41K | +21,749 | 0.00% |
| Howard Financial Services, Ltd. | 248,001 | 0.54% | $471.20K | +2,565 | 0.05% |
| BlackRock, Inc. | 242,479 | 0.53% | $460.71K | +177,707 | 0.00% |
| Vanguard Fiduciary Trust Co | 174,132 | 0.38% | $330.85K | +57,469 | 0.00% |
| State Street Corp | 120,100 | 0.26% | $228.19K | +28,900 | 0.00% |
| Marshall Wace, Llp | 100,640 | 0.22% | $191.22K | New | 0.00% |
| HighTower Advisors, LLC | 85,550 | 0.19% | $162.55K | +70,350 | 0.00% |
| Northern Trust Corp | 70,817 | 0.15% | $134.55K | +4,763 | 0.00% |
| Beacon Pointe Advisors, LLC | 62,507 | 0.14% | $118.76K | – | 0.00% |
| Bridgeway Capital Management, LLC | 45,000 | 0.10% | $85.50K | +20,000 | 0.00% |
| Ingalls & Snyder LLC | 36,676 | 0.08% | $70 | – | 0.00% |
| Two Sigma Investments, LP | 30,414 | 0.07% | $57.79K | +4,034 | 0.00% |
| Stifel Financial Corp | 27,900 | 0.06% | $53.01K | +12,900 | 0.00% |
| Jane Street Group, LLC | 26,999 | 0.06% | $51.30K | −13,317 | 0.00% |
| Axq Capital, LP | 24,623 | 0.05% | $46.78K | New | 0.01% |
| Vanguard Global Advisers, LLC | 20,958 | 0.05% | $39.82K | – | 0.00% |
| Stratos Wealth Advisors, LLC | 19,314 | 0.04% | $36.70K | +5,497 | 0.00% |
| Quadrature Capital Ltd | 15,662 | 0.03% | $29.76K | New | 0.00% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | % of shares | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 29 | 3M | 6.3% | 6 / 15 | 3 / 6 | 1M | 1M |
| Q1 2026 | 29 | 3M | 6.3% | 11 / 8 | 2 / 6 | 2M | 0M |
| Q4 2025 | 25 | 2M | 3.8% | 7 / 8 | 4 / 6 | 1M | 0M |
| Q3 2025 | 25 | 2M | 3.4% | 13 / 5 | 2 / 1 | 1M | 0M |
| Q2 2025 | 13 | 1M | 1.3% | 7 / 2 | 1 / 0 | 0M | 0M |
| Q1 2025 | 6 | 0M | 0.8% | 2 / 2 | 1 / 1 | 0M | 0M |
| Q4 2024 | 5 | 0M | 0.3% | 2 / 1 | 1 / 4 | 0M | 0M |
| Q3 2024 | 7 | 0M | 0.3% | 7 / 0 | 0 / 0 | 0M | 0M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
| Fund | Shares | % of OSTX | Value | % of fund | As of |
|---|---|---|---|---|---|
| Vanguard Total Stock Market Index Fund | 416,115 | 0.90% | $790.62K | 0.00% | Jun 30, 2026 |
| Vanguard Extended Market Index Fund | 361,536 | 0.78% | $686.92K | 0.00% | Jun 30, 2026 |
| Fidelity Extended Market Index Fund | 145,135 | 0.31% | $310.59K | 0.00% | May 31, 2026 |
| iShares Micro-Cap ETF | 110,432 | 0.24% | $209.82K | 0.01% | Jun 30, 2026 |
| Ultra-Small Company Market Fund | 45,000 | 0.10% | $85.50K | 0.06% | Jun 30, 2026 |
| Fidelity Series Total Market Index Fund | 34,884 | 0.08% | $74.65K | 0.00% | May 31, 2026 |
| Fidelity Total Market Index Fund | 32,844 | 0.07% | $70.29K | 0.00% | May 31, 2026 |
| 1290 VT Micro Cap Portfolio | 7,436 | 0.02% | $14.13K | 0.01% | Jun 30, 2026 |
| Blackstone Alternative Multi-Strategy Fund | -1,800 | -0.00% | -$3.42K | -0.00% | Jun 30, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | % of shares | Latest filing |
|---|---|---|---|---|
| Paul A. Romness | President and CEO, Director | 2,248,000 | 4.87% | May 15, 2026 |
| Robert Petit | See Remarks | 200,000 | 0.43% | Feb 13, 2026 |
| Christopher P. Acevedo | Chief Financial Officer | 109,375 | 0.24% | Feb 13, 2026 |
| Craig Eagle | Director | – | – | Jul 23, 2026 |
| Avril Suzette McKean-Dieser | Director | 5,000 | 0.01% | Feb 13, 2026 |
| Karim Galzahr | Director | – | – | Feb 13, 2026 |
| Olivier Roger Jarry | Director | – | – | Feb 13, 2026 |
| Theodore F. Search | Director | 455,835 | 0.99% | Feb 13, 2026 |
| John Ciccio | Director | 455,835 | 0.99% | Feb 13, 2026 |
| Colin Goddard | Director | 225,179 | 0.49% | Feb 14, 2025 |
| LLC Einodmil | – | 2,829,582 | 6.13% | May 9, 2025 |
| Shalom Auerbach | – | 2,687,570 | 5.83% | May 9, 2025 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Shalom Auerbach 10% owner | May 7, 2025 | Sale | −82,000 | $2.00 | $164.00K | 2,664,199 |
| Shalom Auerbach 10% owner | Apr 10, 2025 | Sale | −10,000 | $1.39 | $13.90K | 2,746,199 |
| Shalom Auerbach 10% owner | Apr 9, 2025 | Sale | −50,012 | $1.35 | $67.52K | 2,756,199 |
| Paul A. Romness President and CEO, Director, 10% owner | Feb 28, 2025 | Other | +225,000 | – | – | 2,473,000 |
| LLC Einodmil 10% owner | Feb 27, 2025 | Other | −225,000 | $1.64 | $369.00K | 2,806,211 |
| LLC Einodmil 10% owner | Feb 14, 2025 | Sale | −100,000 | $2.84 | $284.00K | 2,431,211 |
| Shalom Auerbach 10% owner | Jan 15, 2025 | Sale | −16,720 | $6.74 | $112.69K | 2,531,211 |
| Shalom Auerbach 10% owner | Aug 2, 2024 | Conversion | +270,465 | – | – | 1,736,306 |
| Shalom Auerbach 10% owner | Aug 2, 2024 | Conversion | +23,371 | – | – | 23,371 |
| Shalom Auerbach 10% owner | Aug 2, 2024 | Conversion | +633,980 | – | – | 1,438,355 |
| Shalom Auerbach 10% owner | Aug 2, 2024 | Conversion | +27,486 | – | – | 1,465,841 |
| Shalom Auerbach 10% owner | Aug 2, 2024 | Conversion | +53,468 | – | – | 1,789,774 |
| Shalom Auerbach 10% owner | Aug 2, 2024 | Conversion | +131,472 | – | – | 1,921,246 |
| Shalom Auerbach 10% owner | Aug 2, 2024 | Conversion | +78,710 | – | – | 1,999,956 |
| Shalom Auerbach 10% owner | Aug 2, 2024 | Conversion | +88,940 | – | – | 2,088,896 |
| Shalom Auerbach 10% owner | Aug 2, 2024 | Conversion | +179,027 | – | – | 2,267,923 |
| Shalom Auerbach 10% owner | Aug 2, 2024 | Conversion | +51,035 | – | – | 2,318,958 |
| Shalom Auerbach 10% owner | Aug 2, 2024 | Conversion | +178,135 | – | – | 2,497,093 |
| Shalom Auerbach 10% owner | Aug 2, 2024 | Conversion | +50,838 | – | – | 2,547,931 |
| John Ciccio Director | Aug 2, 2024 | Conversion | +30,264 | – | – | 435,835 |
| John Ciccio Director | Aug 2, 2024 | Conversion | +101,765 | – | – | 139,265 |
| John Ciccio Director | Aug 2, 2024 | Conversion | +266,306 | – | – | 405,571 |
| Theodore F. Search Director | Aug 2, 2024 | Conversion | +30,264 | – | – | 435,835 |
| Theodore F. Search Director | Aug 2, 2024 | Conversion | +101,765 | – | – | 139,265 |
| Theodore F. Search Director | Aug 2, 2024 | Conversion | +266,306 | – | – | 405,571 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.
Planned insider sales
Notices of proposed sale filed on Form 144 before shares are sold
| Seller | Filed | Shares | Market value | Planned sale | Acquired through |
|---|---|---|---|---|---|
| LLC Einodmil 10% stockholder | May 7, 2025 | 1,200,000 | $2.81M | May 7, 2025 | Shares of common stock of the Issuer that were issued upon the automatic conversion of convertible promissory notes held by Einodmil LLC, which occurred upon the consummation of the Issuer's initial p |