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OS THERAP (OSTX)
NYSE
$1.54-$0.05 (-3.14%)
Price as of Aug 21, 2026 7:59 PM EDT- $73.3MMarket Cap
- -35.89%1-Year Change
- BiotechnologyIndustry
OS THERAP (OSTX)
$1.54-$0.05 (-3.14%)
Top Holders
Institutional
Mutual Funds
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
VANGUARD CAPITAL MANAGEMENT LLC | 1.71% | 777,651 | +308,184 (+39.63%) | Jun 30, 2026 |
VANGUARD GROUP INC | 1.19% | 540,421 | +352,158 (+65.16%) | Dec 31, 2025 |
N/A | 1.03% | 469,467 | +469,467 (+100.00%) | Mar 31, 2026 |
CM MANAGEMENT, LLC | 0.88% | 400,000 | 0 (0.00%) | Jun 30, 2026 |
GEODE CAPITAL MANAGEMENT, LLC | 0.66% | 301,794 | +21,749 (+7.21%) | Jun 30, 2026 |
HOWARD FINANCIAL SERVICES, LTD. | 0.54% | 248,001 | +2,565 (+1.03%) | Jun 30, 2026 |
BLACKROCK, INC. | 0.53% | 242,479 | +177,707 (+73.29%) | Jun 30, 2026 |
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
VANGUARD INDEX FUNDS | 0.88% | 402,800 | 0 (0.00%) | Mar 31, 2026 |
FIDELITY CONCORD STREET TRUST | 0.47% | 212,863 | +21,127 (+9.93%) | May 31, 2026 |
VANGUARD INSTITUTIONAL INDEX FUNDS | 0.15% | 66,667 | +66,667 (+100.00%) | Mar 31, 2026 |
iSHARES TRUST | 0.13% | 61,094 | 0 (0.00%) | May 31, 2026 |
BRIDGEWAY FUNDS INC | 0.05% | 25,000 | 0 (0.00%) | Mar 31, 2026 |
EQ ADVISORS TRUST | 0.009% | 4,080 | 0 (0.00%) | Mar 31, 2026 |
JOHN HANCOCK VARIABLE INSURANCE TRUST | 0.002% | 730 | 0 (0.00%) | Mar 31, 2026 |
Current Ownership Distribution
- Other34.1M (74.85%)
- Institutions9.1M (20.05%)
- Insiders1.4M (2.96%)
- Mutual Funds970,422 (2.13%)
Insider Transactions
- 2.96% (1.4M)Current InsiderOwnership (%, shares)
- 0Number of InsiderBuying (last 12 months)
- $0.00Amount of InsiderBuying (last 12 months)
- 0Number of InsiderSelling (last 12 months)
- $0.00Amount of InsiderSelling (last 12 months)
Insider Name & Title | Type | Date
| Transaction Value | Shares | Share Price | Shares After Transactions |
|---|---|---|---|---|---|---|
Romness Paul A. President and CEO | Award | Jan 22, 2026 | $0.00 | 1.0M | $0.00 | 1.0M |
Galzahr Karim | Award | Jan 22, 2026 | $0.00 | 50,000 | $0.00 | 50,000 |
Ciccio John | Award | Jan 22, 2026 | $0.00 | 50,000 | $0.00 | 50,000 |
Acevedo Christopher P. Chief Financial Officer | Award | Jan 22, 2026 | $0.00 | 100,000 | $0.00 | 100,000 |
McKean-Dieser Avril Suzette | Award | Jan 22, 2026 | $0.00 | 50,000 | $0.00 | 50,000 |
Jarry Olivier R. | Award | Jan 22, 2026 | $0.00 | 50,000 | $0.00 | 50,000 |
Search Theodore F. | Award | Jan 22, 2026 | $0.00 | 50,000 | $0.00 | 50,000 |
PETIT ROBERT See Remarks | Award | Jan 22, 2026 | $0.00 | 100,000 | $0.00 | 100,000 |
McKean-Dieser Avril Suzette | Award | Oct 21, 2025 | $0.00 | 140,000 | $0.00 | 140,000 |
PETIT ROBERT See Remarks | Award | Oct 21, 2025 | $0.00 | 500,000 | $0.00 | 500,000 |
Search Theodore F. | Award | Oct 21, 2025 | $0.00 | 140,000 | $0.00 | 140,000 |
Galzahr Karim | Award | Oct 21, 2025 | $0.00 | 140,000 | $0.00 | 140,000 |
Ciccio John | Award | Oct 21, 2025 | $0.00 | 140,000 | $0.00 | 140,000 |
Jarry Olivier R. | Award | Oct 21, 2025 | $0.00 | 140,000 | $0.00 | 140,000 |
Auerbach Shalom | Sell | May 07, 2025 | $163,918.00 | 82,000 | $2.00 | 2.7M |
Auerbach Shalom | Sell | Apr 10, 2025 | $13,900.00 | 10,000 | $1.39 | 2.7M |
Auerbach Shalom | Sell | Apr 09, 2025 | $67,666.24 | 50,012 | $1.35 | 2.8M |
Romness Paul A. President and CEO | Other | Feb 28, 2025 | $0.00 | 225,000 | $0.00 | 2.5M |
Auerbach Shalom | Sell | Feb 14, 2025 | $284,300.00 | 100,000 | $2.84 | 2.4M |
Auerbach Shalom | Sell | Jan 15, 2025 | $112,609.20 | 16,720 | $6.74 | 2.5M |
McKean-Dieser Avril Suzette | Award | Dec 05, 2024 | $0.00 | 40,000 | $0.00 | 40,000 |
Jarry Olivier R. | Award | Dec 05, 2024 | $0.00 | 40,000 | $0.00 | 40,000 |
Search Theodore F. | Award | Dec 05, 2024 | $0.00 | 40,000 | $0.00 | 40,000 |
Romness Paul A. President and CEO | Award | Dec 05, 2024 | $0.00 | 800,000 | $0.00 | 800,000 |
GODDARD COLIN | Award | Dec 05, 2024 | $0.00 | 400,000 | $0.00 | 400,000 |
Ciccio John | Award | Dec 05, 2024 | $0.00 | 40,000 | $0.00 | 40,000 |
Acevedo Christopher P. Chief Financial Officer | Award | Dec 05, 2024 | $0.00 | 200,000 | $0.00 | 200,000 |