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
- +185.6K (+17.6%) vs. Q4 2025Converted for a 1-for-15 split
- Total value
- $6.52M
- −$2.81M (−30.1%) vs. Q4 2025
- New holders
- 7
- 12 more added
- Sold out
- 39
- 7 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 | $16.8M |
| Q2 2025 | 84 | $17.7M |
| Q1 2025 | 83 | $19.1M |
| Q4 2024 | 86 | $28.3M |
| Q3 2024 | 86 | $41.6M |
| Q2 2024 | 77 | $31.2M |
| Q1 2024 | 67 | $34.6M |
| Q4 2023 | 49 | $14.1M |
| 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 | $63.3M |
| 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 |
|---|---|---|---|---|---|
| Clearstead Advisors, LLC | 4 | $22 | 0.00% | −1−14.3% | ReducedConverted for a 1-for-15 split |
| Bogart Wealth, LLC | 5 | $26 | 0.00% | +5 | New |
| Napier Financial, LLC | 6 | $32 | 0.00% | +6 | New |
| Allworth Financial LP | 46 | $242 | 0.00% | −1−1.7% | ReducedConverted for a 1-for-15 split |
| Northwestern Mutual Wealth Management Co | 46 | $242 | 0.00% | +13+38.0% | AddedConverted for a 1-for-15 split |
| North Star Investment Management Corp. | 80 | $421 | 0.00% | +80 | New |
| BNP Paribas Arbitrage, SA | 98 | $515 | 0.00% | −2−1.8% | ReducedConverted for a 1-for-15 split |
| TD Waterhouse Canada Inc. | 103 | $525 | 0.00% | −1−0.6% | ReducedConverted for a 1-for-15 split |
| Harbour Investments, Inc. | 110 | $579 | 0.00% | 00.0% | UnchangedConverted for a 1-for-15 split |
| SBI Securities Co., Ltd. | 113 | $594 | 0.00% | +9+8.3% | AddedConverted for a 1-for-15 split |
| Robinswood Financial LLC | 170 | $894 | 0.00% | 00.0% | UnchangedConverted for a 1-for-15 split |
| Avion Wealth | 318 | $1.00K | 0.00% | +318 | New |
| Wells Fargo & Company | 296 | $1.56K | 0.00% | +290+5,249.4% | AddedConverted for a 1-for-15 split |
| GWM Advisors LLC | 333 | $1.75K | 0.00% | 00.0% | UnchangedConverted for a 1-for-15 split |
| JPMorgan Chase & Co | 383 | $1.80K | 0.00% | −2,155−84.9% | ReducedConverted for a 1-for-15 split |
| Rockefeller Capital Management L.P. | 353 | $1.86K | 0.00% | +20+5.9% | AddedConverted for a 1-for-15 split |
| Royal Bank of Canada | 644 | $3.00K | 0.00% | +581+924.4% | AddedConverted for a 1-for-15 split |
| Advisor Group Holdings, Inc. | 587 | $3.09K | 0.00% | 00.0% | UnchangedConverted for a 1-for-15 split |
| Group One Trading, L.P. | 609 | $3.20K | 0.00% | +165+37.1% | AddedConverted for a 1-for-15 split |
| Tower Research Capital LLC (TRC) | 863 | $4.54K | 0.00% | +596+223.7% | AddedConverted for a 1-for-15 split |
| Jones Financial Companies LLLP | 2,061 | $9.73K | 0.00% | +2,014+4,316.4% | AddedConverted for a 1-for-15 split |
| Vanguard Global Advisers, LLC | 3,089 | $16.2K | 0.00% | +3,089 | New |
| Morgan Stanley | 16,202 | $85.2K | 0.00% | +12,102+295.2% | AddedConverted for a 1-for-15 split |
| Northern Trust Corp | 19,224 | $101.1K | 0.00% | 00.0% | UnchangedConverted for a 1-for-15 split |
| State Street Corp | 39,761 | $209.1K | 0.00% | 00.0% | UnchangedConverted for a 1-for-15 split |
| Vanguard Fiduciary Trust Co | 52,235 | $274.8K | 0.00% | +52,235 | New |
| Millennium Management LLC | 66,739 | $351.0K | 0.00% | −16,119−19.5% | ReducedConverted for a 1-for-15 split |
| UBS Group AG | 92,034 | $484.1K | 0.00% | +66,033+254.0% | AddedConverted for a 1-for-15 split |
| Geode Capital Management, LLC | 97,061 | $510.7K | 0.00% | +5,600+6.1% | AddedConverted for a 1-for-15 split |
| Renaissance Technologies LLC | 109,007 | $573.4K | 0.00% | −28,516−20.7% | ReducedConverted for a 1-for-15 split |
| BlackRock, Inc. | 133,169 | $700.5K | 0.00% | 00.0% | UnchangedConverted for a 1-for-15 split |
| Ameriprise Financial Inc | 255,134 | $1.34M | 0.00% | +2,397+0.9% | AddedConverted for a 1-for-15 split |
| Vanguard Capital Management LLC | 349,096 | $1.84M | 0.00% | +349,096 | New |
| Jacobs Levy Equity Management, Inc | 0 | $0 | 0.00% | −69,886−100.0% | Sold outConverted for a 1-for-15 split |
| Citadel Advisors LLC | 0 | $0 | 0.00% | −43,208−100.0% | Sold outConverted for a 1-for-15 split |
| Susquehanna International Group, LLP | 0 | $0 | 0.00% | −38,839−100.0% | Sold outConverted for a 1-for-15 split |
| Connor, Clark & Lunn Investment Management Ltd. | 0 | $0 | 0.00% | −17,734−100.0% | Sold outConverted for a 1-for-15 split |
| Jane Street Group, LLC | 0 | $0 | 0.00% | −16,400−100.0% | Sold outConverted for a 1-for-15 split |
| Graham Capital Management, L.P. | 0 | $0 | 0.00% | −14,091−100.0% | Sold outConverted for a 1-for-15 split |
| XTX Topco Ltd | 0 | $0 | 0.00% | −11,284−100.0% | Sold outConverted for a 1-for-15 split |
| Charles Schwab Investment Management Inc | 0 | $0 | 0.00% | −5,333−100.0% | Sold outConverted for a 1-for-15 split |
| Acadian Asset Management LLC | 0 | $0 | 0.00% | −5,294−100.0% | Sold outConverted for a 1-for-15 split |
| Qube Research & Technologies Ltd | 0 | $0 | 0.00% | −4,853−100.0% | Sold outConverted for a 1-for-15 split |
| Bank of America Corp | 0 | $0 | 0.00% | −4,510−100.0% | Sold outConverted for a 1-for-15 split |
| Point72 Asset Management, L.P. | 0 | $0 | 0.00% | −3,206−100.0% | Sold outConverted for a 1-for-15 split |
| Wiley Bros.-Aintree Capital, LLC | 0 | $0 | 0.00% | −2,867−100.0% | Sold outConverted for a 1-for-15 split |
| Regions Financial Corp | 0 | $0 | 0.00% | −2,000−100.0% | Sold outConverted for a 1-for-15 split |
| LPL Financial LLC | 0 | $0 | 0.00% | −1,965−100.0% | Sold outConverted for a 1-for-15 split |
| R Squared Ltd | 0 | $0 | 0.00% | −1,873−100.0% | Sold outConverted for a 1-for-15 split |
| Marshall Wace, LLP | 0 | $0 | 0.00% | −1,871−100.0% | Sold outConverted for a 1-for-15 split |
| Two Sigma Securities, LLC | 0 | $0 | 0.00% | −1,634−100.0% | Sold outConverted for a 1-for-15 split |
| Sigma Planning Corp | 0 | $0 | 0.00% | −1,600−100.0% | Sold outConverted for a 1-for-15 split |
| Two Sigma Investments, LP | 0 | $0 | 0.00% | −1,563−100.0% | Sold outConverted for a 1-for-15 split |
| PFG Investments, LLC | 0 | $0 | 0.00% | −1,450−100.0% | Sold outConverted for a 1-for-15 split |
| LVM Capital Management Ltd | 0 | $0 | 0.00% | −1,400−100.0% | Sold outConverted for a 1-for-15 split |
| StoneX Group Inc. | 0 | $0 | 0.00% | −1,325−100.0% | Sold outConverted for a 1-for-15 split |
| Two Sigma Advisers, LP | 0 | $0 | 0.00% | −1,220−100.0% | Sold outConverted for a 1-for-15 split |
| DnB Asset Management AS | 0 | $0 | 0.00% | −1,040−100.0% | Sold outConverted for a 1-for-15 split |
| Baader Bank INC | 0 | $0 | 0.00% | −1,424−100.0% | Sold outConverted for a 1-for-15 split |
| Raymond James Financial Inc | 0 | $0 | 0.00% | −755−100.0% | Sold outConverted for a 1-for-15 split |
| Bank of New York Mellon Corp | 0 | $0 | 0.00% | −743−100.0% | Sold outConverted for a 1-for-15 split |
| J. L. Bainbridge & Co., Inc. | 0 | $0 | 0.00% | −741−100.0% | Sold outConverted for a 1-for-15 split |
| Focus Financial Network, Inc. | 0 | $0 | 0.00% | −690−100.0% | Sold outConverted for a 1-for-15 split |
| Janney Montgomery Scott LLC | 0 | $0 | 0.00% | −667−100.0% | Sold outConverted for a 1-for-15 split |
| FMR LLC | 0 | $0 | 0.00% | −491−100.0% | Sold outConverted for a 1-for-15 split |
| Huntington National Bank | 0 | $0 | 0.00% | −200−100.0% | Sold outConverted for a 1-for-15 split |
| Optiver Holding B.V. | 0 | $0 | 0.00% | −56−100.0% | Sold outConverted for a 1-for-15 split |
| Nisa Investment Advisors, LLC | 0 | $0 | 0.00% | −23−100.0% | Sold outConverted for a 1-for-15 split |
| NBC Securities, Inc. | 0 | $0 | 0.00% | −10−100.0% | Sold outConverted for a 1-for-15 split |
| SRS Capital Advisors, Inc. | 0 | $0 | 0.00% | −3−100.0% | Sold outConverted for a 1-for-15 split |
| Hantz Financial Services, Inc. | 0 | $0 | 0.00% | −5−100.0% | Sold outConverted for a 1-for-15 split |
| CWM, LLC | 0 | $0 | 0.00% | −3−100.0% | Sold outConverted for a 1-for-15 split |
| Vanguard Group Inc | – | – | – | – | Not filed |
| Greenberg Financial Group | – | – | – | – | Not filed |