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OS THERAP (OSTX)
NYSE
$1.82+$0.02 (+1.11%)
Price as of Jun 03, 2026 7:57 PM EDT- $95.3MMarket Cap
- 15.09%1-Year Change
- BiotechnologyIndustry
OS THERAP (OSTX)
$1.82+$0.02 (+1.11%)
Top Holders
Institutional
Mutual Funds
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
VANGUARD GROUP INC | 1.21% | 540,421 | +352,158 (+65.16%) | Dec 31, 2025 |
N/A | 1.05% | 469,467 | +469,467 (+100.00%) | Mar 31, 2026 |
SUSQUEHANNA INTERNATIONAL GROUP, LLP | 1.01% | 448,737 | +448,737 (+100.00%) | Mar 31, 2026 |
CM MANAGEMENT, LLC | 0.90% | 400,000 | 0 (0.00%) | Mar 31, 2026 |
UBS GROUP AG | 0.78% | 348,678 | +330,522 (+94.79%) | Mar 31, 2026 |
GEODE CAPITAL MANAGEMENT, LLC | 0.63% | 280,045 | +34,007 (+12.14%) | Mar 31, 2026 |
HOWARD FINANCIAL SERVICES, LTD. | 0.55% | 245,436 | +245,436 (+100.00%) | Mar 31, 2026 |
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
VANGUARD INDEX FUNDS | 0.90% | 402,800 | 0 (0.00%) | Mar 31, 2026 |
VANGUARD INSTITUTIONAL INDEX FUNDS | 0.15% | 66,667 | +66,667 (+100.00%) | Mar 31, 2026 |
iSHARES TRUST | 0.14% | 61,094 | +5,628 (+9.21%) | Mar 31, 2026 |
BRIDGEWAY FUNDS INC | 0.06% | 25,000 | 0 (0.00%) | Mar 31, 2026 |
EQ ADVISORS TRUST | 0.009% | 4,080 | 0 (0.00%) | Mar 31, 2026 |
Current Ownership Distribution
- Other36.3M (81.54%)
- Institutions6.2M (14.00%)
- Insiders1.4M (3.03%)
- Mutual Funds634,641 (1.42%)
Insider Transactions
- 3.03% (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 |
|---|---|---|---|---|---|---|
Galzahr Karim | 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 |
Jarry Olivier R. | 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 |
Ciccio John | 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 |
Romness Paul A. President and CEO | Award | Jan 22, 2026 | $0.00 | 1.0M | $0.00 | 1.0M |
McKean-Dieser Avril Suzette | Award | Jan 22, 2026 | $0.00 | 50,000 | $0.00 | 50,000 |
Search Theodore F. | 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 |
McKean-Dieser Avril Suzette | 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 |
Galzahr Karim | 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 |
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 |
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 |
Ciccio John | 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 |
GODDARD COLIN | Award | Dec 05, 2024 | $0.00 | 400,000 | $0.00 | 400,000 |
Acevedo Christopher P. Chief Financial Officer | Award | Dec 05, 2024 | $0.00 | 200,000 | $0.00 | 200,000 |
McKean-Dieser Avril Suzette | Award | Dec 05, 2024 | $0.00 | 40,000 | $0.00 | 40,000 |
Auerbach Shalom | Conversion | Aug 02, 2024 | $0.00 | 0 | $0.00 | 0 |
Search Theodore F. | Conversion | Aug 02, 2024 | $0.00 | 101,765 | $0.00 | 139,265 |
Auerbach Shalom | Conversion | Aug 02, 2024 | $0.00 | 0 | $0.00 | 0 |