Atossa Therapeutics, Inc.
ATOS- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001488039
No open-market purchases or sales by Atossa Therapeutics, Inc. insiders were filed in the last 90 days; 31 institutions reported holding it in 13F filings for Q2 2026, worth $2.60M in total; no superinvestor holds it.
13F holders, Q1 2026
Institutional positions in Atossa Therapeutics, Inc. as of Mar 31, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 33
- −32 vs. Q4 2025
- Shares held
- 1.24M
- −14.6M (−92.2%) vs. Q4 2025
- Total value
- $6.52M
- −$2.81M (−30.1%) vs. Q4 2025
- New holders
- 7
- 2 more added
- Sold out
- 39
- 24 more reduced
2 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting ATOS on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 31 | $2.60M |
| Q1 2026 | 33 | $6.52M |
| Q4 2025 | 67 | $13.0M |
| Q3 2025 | 67 | $16.9M |
| Q2 2025 | 84 | $17.7M |
| Q1 2025 | 83 | $19.1M |
| Q4 2024 | 86 | $28.3M |
| Q3 2024 | 86 | $41.8M |
| Q2 2024 | 77 | $31.2M |
| Q1 2024 | 67 | $37.4M |
| Q4 2023 | 49 | $14.2M |
| Q3 2023 | 54 | $11.9M |
| Q2 2023 | 52 | $20.2M |
| Q1 2023 | 45 | $11.9M |
| Q4 2022 | 51 | $9.49M |
| Q3 2022 | 59 | $15.8M |
| Q2 2022 | 73 | $25.4M |
| Q1 2022 | 83 | $45.4M |
| Q4 2021 | 92 | $64.2M |
| Q3 2021 | 93 | $102.1M |
| Q2 2021 | 90 | $225.8M |
| Q1 2021 | 54 | $22.8M |
Institutions, Q1 2026
Shares, value and share of portfolio for each institution holding Atossa Therapeutics, Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Vanguard Capital Management LLC | 349,096 | $1.84M | 0.00% | +349,096 | New |
| Ameriprise Financial Inc | 255,134 | $1.34M | 0.00% | −3,535,927−93.3% | Reduced |
| BlackRock, Inc. | 133,169 | $700.5K | 0.00% | −1,864,458−93.3% | Reduced |
| Renaissance Technologies LLC | 109,007 | $573.4K | 0.00% | −1,953,831−94.7% | Reduced |
| Geode Capital Management, LLC | 97,061 | $510.7K | 0.00% | −1,274,848−92.9% | Reduced |
| UBS Group AG | 92,034 | $484.1K | 0.00% | −297,974−76.4% | Reduced |
| Millennium Management LLC | 66,739 | $351.0K | 0.00% | −1,176,129−94.6% | Reduced |
| Vanguard Fiduciary Trust Co | 52,235 | $274.8K | 0.00% | +52,235 | New |
| State Street Corp | 39,761 | $209.1K | 0.00% | −556,724−93.3% | Reduced |
| Northern Trust Corp | 19,224 | $101.1K | 0.00% | −269,175−93.3% | Reduced |
| Morgan Stanley | 16,202 | $85.2K | 0.00% | −45,298−73.7% | Reduced |
| Vanguard Global Advisers, LLC | 3,089 | $16.2K | 0.00% | +3,089 | New |
| Jones Financial Companies LLLP | 2,061 | $9.73K | 0.00% | +1,361+194.4% | Added |
| Tower Research Capital LLC (TRC) | 863 | $4.54K | 0.00% | −3,136−78.4% | Reduced |
| Group One Trading, L.P. | 609 | $3.20K | 0.00% | −6,053−90.9% | Reduced |
| Advisor Group Holdings, Inc. | 587 | $3.09K | 0.00% | −8,260−93.4% | Reduced |
| Royal Bank of Canada | 644 | $3.00K | 0.00% | −299−31.7% | Reduced |
| Rockefeller Capital Management L.P. | 353 | $1.86K | 0.00% | −4,647−92.9% | Reduced |
| JPMorgan Chase & Co | 383 | $1.80K | 0.00% | −37,684−99.0% | Reduced |
| GWM Advisors LLC | 333 | $1.75K | 0.00% | −4,667−93.3% | Reduced |
| Wells Fargo & Company | 296 | $1.56K | 0.00% | +213+256.6% | Added |
| Avion Wealth | 318 | $1.00K | 0.00% | +318 | New |
| Robinswood Financial LLC | 170 | $894 | 0.00% | −2,387−93.4% | Reduced |
| SBI Securities Co., Ltd. | 113 | $594 | 0.00% | −1,452−92.8% | Reduced |
| Harbour Investments, Inc. | 110 | $579 | 0.00% | −1,546−93.4% | Reduced |
| TD Waterhouse Canada Inc. | 103 | $525 | 0.00% | −1,452−93.4% | Reduced |
| BNP Paribas Arbitrage, SA | 98 | $515 | 0.00% | −1,399−93.5% | Reduced |
| North Star Investment Management Corp. | 80 | $421 | 0.00% | +80 | New |
| Allworth Financial LP | 46 | $242 | 0.00% | −656−93.4% | Reduced |
| Northwestern Mutual Wealth Management Co | 46 | $242 | 0.00% | −454−90.8% | Reduced |
| Napier Financial, LLC | 6 | $32 | 0.00% | +6 | New |
| Bogart Wealth, LLC | 5 | $26 | 0.00% | +5 | New |
| Clearstead Advisors, LLC | 4 | $22 | 0.00% | −66−94.3% | Reduced |
| Jacobs Levy Equity Management, Inc | 0 | $0 | 0.00% | −1,048,289−100.0% | Sold out |
| Citadel Advisors LLC | 0 | $0 | 0.00% | −648,115−100.0% | Sold out |
| Susquehanna International Group, LLP | 0 | $0 | 0.00% | −582,587−100.0% | Sold out |
| Connor, Clark & Lunn Investment Management Ltd. | 0 | $0 | 0.00% | −266,010−100.0% | Sold out |
| Jane Street Group, LLC | 0 | $0 | 0.00% | −245,998−100.0% | Sold out |
| Graham Capital Management, L.P. | 0 | $0 | 0.00% | −211,369−100.0% | Sold out |
| XTX Topco Ltd | 0 | $0 | 0.00% | −169,261−100.0% | Sold out |
| Charles Schwab Investment Management Inc | 0 | $0 | 0.00% | −80,000−100.0% | Sold out |
| Acadian Asset Management LLC | 0 | $0 | 0.00% | −79,414−100.0% | Sold out |
| Qube Research & Technologies Ltd | 0 | $0 | 0.00% | −72,802−100.0% | Sold out |
| Bank of America Corp | 0 | $0 | 0.00% | −67,654−100.0% | Sold out |
| Point72 Asset Management, L.P. | 0 | $0 | 0.00% | −48,092−100.0% | Sold out |
| Wiley Bros.-Aintree Capital, LLC | 0 | $0 | 0.00% | −43,000−100.0% | Sold out |
| Regions Financial Corp | 0 | $0 | 0.00% | −30,000−100.0% | Sold out |
| LPL Financial LLC | 0 | $0 | 0.00% | −29,469−100.0% | Sold out |
| R Squared Ltd | 0 | $0 | 0.00% | −28,099−100.0% | Sold out |
| Marshall Wace, LLP | 0 | $0 | 0.00% | −28,072−100.0% | Sold out |
| Two Sigma Securities, LLC | 0 | $0 | 0.00% | −24,508−100.0% | Sold out |
| Sigma Planning Corp | 0 | $0 | 0.00% | −24,000−100.0% | Sold out |
| Two Sigma Investments, LP | 0 | $0 | 0.00% | −23,452−100.0% | Sold out |
| PFG Investments, LLC | 0 | $0 | 0.00% | −21,750−100.0% | Sold out |
| LVM Capital Management Ltd | 0 | $0 | 0.00% | −21,000−100.0% | Sold out |
| StoneX Group Inc. | 0 | $0 | 0.00% | −19,871−100.0% | Sold out |
| Two Sigma Advisers, LP | 0 | $0 | 0.00% | −18,300−100.0% | Sold out |
| DnB Asset Management AS | 0 | $0 | 0.00% | −15,600−100.0% | Sold out |
| Baader Bank INC | 0 | $0 | 0.00% | −21,364−100.0% | Sold out |
| Raymond James Financial Inc | 0 | $0 | 0.00% | −11,323−100.0% | Sold out |
| Bank of New York Mellon Corp | 0 | $0 | 0.00% | −11,147−100.0% | Sold out |
| J. L. Bainbridge & Co., Inc. | 0 | $0 | 0.00% | −11,121−100.0% | Sold out |
| Focus Financial Network, Inc. | 0 | $0 | 0.00% | −10,350−100.0% | Sold out |
| Janney Montgomery Scott LLC | 0 | $0 | 0.00% | −10,000−100.0% | Sold out |
| FMR LLC | 0 | $0 | 0.00% | −7,365−100.0% | Sold out |
| Huntington National Bank | 0 | $0 | 0.00% | −3,000−100.0% | Sold out |
| Optiver Holding B.V. | 0 | $0 | 0.00% | −838−100.0% | Sold out |
| Nisa Investment Advisors, LLC | 0 | $0 | 0.00% | −350−100.0% | Sold out |
| NBC Securities, Inc. | 0 | $0 | 0.00% | −150−100.0% | Sold out |
| SRS Capital Advisors, Inc. | 0 | $0 | 0.00% | −42−100.0% | Sold out |
| Hantz Financial Services, Inc. | 0 | $0 | 0.00% | −82−100.0% | Sold out |
| CWM, LLC | 0 | $0 | 0.00% | −50−100.0% | Sold out |
| Vanguard Group Inc | – | – | – | – | Not filed |
| Greenberg Financial Group | – | – | – | – | Not filed |