71 institutions reported holding $7.5M of ATOSSA THERAPEUTICS INC (ATOS) in SEC 13F filings for 2026-03-31. Largest institutional holders: VANGUARD CAPITAL MANAGEMENT LLC ($1.8M), AMERIPRISE FINANCIAL INC ($1.3M), BlackRock, Inc. ($700,469), RENAISSANCE TECHNOLOGIES LLC ($573,377), SIMPLEX TRADING, LLC ($520,214). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | VANGUARD CAPITAL MANAGEMENT LLC | $1.8M | 349,096 | New |
| 2 | AMERIPRISE FINANCIAL INC | $1.3M | 255,134 | Trimmed |
| 3 | BlackRock, Inc. | $700,469 | 133,169 | Trimmed |
| 4 | RENAISSANCE TECHNOLOGIES LLC | $573,377 | 109,007 | Trimmed |
| 5 | SIMPLEX TRADING, LLC | $520,214 | 98,900 | Added |
| 6 | GEODE CAPITAL MANAGEMENT, LLC | $510,657 | 97,061 | Trimmed |
| 7 | UBS Group AG | $484,099 | 92,034 | Trimmed |
| 8 | MILLENNIUM MANAGEMENT LLC | $351,047 | 66,739 | Trimmed |
| 9 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $289,300 | 55,000 | Trimmed |
| 10 | VANGUARD FIDUCIARY TRUST CO | $274,756 | 52,235 | New |
| 11 | GROUP ONE TRADING LLC | $224,649 | 42,709 | Trimmed |
| 12 | STATE STREET CORP | $209,143 | 39,761 | Trimmed |
| 13 | NORTHERN TRUST CORP | $101,118 | 19,224 | Trimmed |
| 14 | MORGAN STANLEY | $85,222 | 16,202 | Trimmed |
| 15 | Vanguard Global Advisers, LLC | $16,248 | 3,089 | New |
| 16 | JONES FINANCIAL COMPANIES LLLP | $9,728 | 2,061 | Added |
| 17 | Tower Research Capital LLC (TRC) | $4,539 | 863 | Trimmed |
| 18 | OSAIC HOLDINGS, INC. | $3,086 | 587 | Trimmed |
| 19 | Royal Bank of Canada | $3,000 | 644 | Trimmed |
| 20 | Rockefeller Capital Management L.P. | $1,857 | 353 | Trimmed |
| 21 | JPMORGAN CHASE & CO | $1,804 | 383 | Trimmed |
| 22 | WELLS FARGO & COMPANY/MN | $1,557 | 296 | Added |
| 23 | Avion Wealth | $1,000 | 318 | New |
| 24 | SBI Securities Co., Ltd. | $594 | 113 | Trimmed |
| 25 | HARBOUR INVESTMENTS, INC. | $579 | 110 | Trimmed |
Source: SEC Form 13F filings · as of 2026-03-31