Atossa TherapeuticsATOS
13F holders, Q1 2026 (March 31)At the end of Q1 2026, 33 institutions reported holding Atossa Therapeutics Inc. (ATOS) in their 13F filings, up 32 from Q4 2025. 4 opened new positions and 2 sold out. The largest holders were Vanguard Capital Management LLC ($1.8M), Ameriprise Financial Inc. ($1.3M) and BlackRock, Inc. ($700K). 2 famous investors held it, including Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio) and Israel Englander (0.0% of Millennium Management's portfolio).
- Company
- Atossa Therapeutics Inc.
- CUSIP
- 04962H704
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 4 | $1K |
| Exits | 2 | $360K |
All 13F filers, Q4 2025 → Q1 2026: 90,230 shares bought and 113,708 shares sold, net −23,479 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 33 holders
| Vanguard Capital Management LLC | 0.00% | — | 349,096 | $1.8M |
| Ameriprise Financial Inc. | 0.00% | Add +0.9% | 255,134 | $1.3M |
| BlackRock, Inc. | 0.00% | No change | 133,169 | $700K |
| Renaissance Technologies | 0.00% | Reduce -20.7% | 109,007 | $573K |
| Geode Capital Management, LLC | 0.00% | Add +6.1% | 97,061 | $511K |
| UBS Group AG | 0.00% | Add +254.0% | 92,034 | $484K |
| Millennium Management | 0.00% | Reduce -19.4% | 66,739 | $351K |
| Vanguard Fiduciary Trust Co. | 0.00% | — | 52,235 | $275K |
| State Street Corp. | 0.00% | No change | 39,761 | $209K |
| Northern Trust Corp. | 0.00% | No change | 19,224 | $101K |
| Morgan Stanley | 0.00% | Add +295.2% | 16,202 | $85K |
| Vanguard Global Advisers, LLC | 0.00% | — | 3,089 | $16K |
| Jones Financial Companies LLLP | 0.00% | Add +4316.4% | 2,061 | $10K |
| Tower Research Capital LLC (TRC) | 0.00% | Add +223.7% | 863 | $5K |
| Group One Trading LLC | 0.00% | Add +37.1% | 609 | $3K |
| Osaic Holdings, Inc. | 0.00% | Reduce -0.5% | 587 | $3K |
| Royal Bank of Canada | 0.00% | Add +924.4% | 644 | $3K |
| Rockefeller Capital Management L.P. | 0.00% | Add +5.9% | 353 | $2K |
| JPMorgan Chase & Co. | 0.00% | Reduce -84.9% | 383 | $2K |
| NewEdge Advisors, LLC | 0.00% | Reduce -0.1% | 333 | $2K |
| Wells Fargo & Company | 0.00% | Add +5249.4% | 296 | $2K |
| Avion Wealth | 0.00% | New | 318 | $1K |
| Robinswood Financial LLC | 0.00% | Reduce -0.3% | 170 | $894 |
| SBI Securities Co., Ltd. | 0.00% | Add +8.3% | 113 | $594 |
| Harbour Investments, Inc. | 0.00% | Reduce -0.4% | 110 | $579 |
| TD Waterhouse Canada Inc. | 0.00% | Reduce -0.6% | 103 | $525 |
| BNP Paribas Financial Markets | 0.00% | Reduce -1.8% | 98 | $515 |
| North Star Investment Management Corp. | 0.00% | New | 80 | $421 |
| Northwestern Mutual Wealth Management Co. | 0.00% | Add +38.0% | 46 | $242 |
| Allworth Financial LP | 0.00% | Reduce -1.7% | 46 | $242 |
| Napier Financial, LLC | 0.00% | New | 6 | $32 |
| Bogart Wealth, LLC | 0.00% | New | 5 | $26 |
| Clearstead Advisors, LLC | 0.00% | Reduce -14.3% | 4 | $22 |
"% of holder's portfolio" is ATOS's weight in each manager's 13F, not the share of Atossa Therapeutics Inc. the manager owns.