ATOSSA THERAPEUTICS, INC. (ATOS) — Institutional Holders, Q2 2026
32 institutional investment managers reported a ATOS position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $2.6M. Every filer is listed below, ranked by position value. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.
ATOS in Q2 2026: what funds did
Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.
Biggest buyers
- JANE STREET GROUPNew · +56,602 sh+$109.2K
- BlackRockAdded · +31,189 sh+$60.2K
- RENAISSANCE TECHNOLOGIESAdded · +23,036 sh+$44.5K
- SUSQUEHANNA INTERNATIONAL GROUP, LLPNew · +15,574 sh+$30.1K
- VANGUARD CAPITAL MANAGEMENTAdded · +12,651 sh+$24.4K
Biggest sellers
- MILLENNIUM MANAGEMENTTrimmed · -20,231 sh-$39.0K
- UBS Group AGTrimmed · -9,414 sh-$18.2K
- GEODE CAPITAL MANAGEMENTTrimmed · -4,679 sh-$9.0K
- MORGAN STANLEYTrimmed · -3,857 sh-$7.4K
- Tower Research Capital (TRC)Sold out · -863 sh-$1.7K
ATOS 13F holders ranked 1–32 of 32
| # | Institution | Shares | Value | % of portfolio | QoQShares vs Q1 2026 |
|---|---|---|---|---|---|
| 1 | VANGUARD CAPITAL MANAGEMENT#1 · 361,747 sh | 361,747 | $698.2K | 0.00% | +3.6% |
| 2 | AMERIPRISE FINANCIAL#2 · 258,234 sh | 258,234 | $498.4K | <0.01% | +1.2% |
| 3 | BlackRock#3 · 164,358 sh | 164,358 | $317.2K | 0.00% | +23.4% |
| 4 | RENAISSANCE TECHNOLOGIES#4 · 132,043 sh | 132,043 | $254.8K | <0.01% | +21.1% |
| 5 | GEODE CAPITAL MANAGEMENT#5 · 92,382 sh | 92,382 | $178.3K | 0.00% | -4.8% |
| 6 | UBS Group AG#6 · 82,620 sh | 82,620 | $159.5K | 0.00% | -10.2% |
| 7 | JANE STREET GROUP#7 · 56,602 sh | 56,602 | $109.2K | 0.00% | New |
| 8 | VANGUARD FIDUCIARY#8 · 52,583 sh | 52,583 | $101.5K | 0.00% | +0.7% |
| 9 | MILLENNIUM MANAGEMENT#9 · 46,508 sh | 46,508 | $89.8K | 0.00% | -30.3% |
| 10 | STATE STREET#10 · 39,761 sh | 39,761 | $76.7K | 0.00% | 0.0% |
| 11 | NORTHERN#11 · 20,249 sh | 20,249 | $39.1K | 0.00% | +5.3% |
| 12 | SUSQUEHANNA INTERNATIONAL GROUP, LLP#12 · 15,574 sh | 15,574 | $30.1K | 0.00% | New |
| 13 | MORGAN STANLEY#13 · 12,345 sh | 12,345 | $23.8K | 0.00% | -23.8% |
| 14 | Vanguard Global Advisers#14 · 3,089 sh | 3,089 | $6.0K | 0.00% | 0.0% |
| 15 | ROYAL BANK OF CANADA#15 · 1,994 sh | 1,994 | $4.0K | 0.00% | +209.6% |
| 16 | JONES FINANCIAL COMPANIES LLLP#16 · 2,061 sh | 2,061 | $3.9K | 0.00% | 0.0% |
| 17 | MCF Advisors#17 · 1,066 sh | 1,066 | $2.1K | <0.01% | New |
| 18 | OSAIC#18 · 587 sh | 587 | $1.1K | 0.00% | 0.0% |
| 19 | JPMORGAN CHASE#19 · 390 sh | 390 | $772.00 | 0.00% | +1.8% |
| 20 | Rockefeller Capital Management L.P.#20 · 333 sh | 333 | $643.00 | 0.00% | -5.7% |
| 21 | WELLS FARGO & COMPANY#21 · 228 sh | 228 | $440.00 | 0.00% | -23.0% |
| 22 | SBI Securities , Ltd.#22 · 148 sh | 148 | $286.00 | — | +31.0% |
| 23 | HARBOUR INVESTMENTS#23 · 110 sh | 110 | $212.00 | 0.00% | 0.0% |
| 24 | TD Waterhouse Canada#24 · 103 sh | 103 | $210.00 | — | 0.0% |
| 25 | BNP PARIBAS FINANCIAL MARKETS#25 · 87 sh | 87 | $168.00 | 0.00% | -11.2% |
| 26 | GROUP ONE TRADING, L.P.#26 · 54 sh | 54 | $104.00 | 0.00% | -91.1% |
| 27 | Caitong International Asset Management , Ltd#27 · 6 sh | 6 | $12.00 | 0.00% | New |
| 28 | Napier Financial#28 · 6 sh | 6 | $12.00 | 0.00% | 0.0% |
| 29 | Bogart Wealth#29 · 5 sh | 5 | $10.00 | 0.00% | 0.0% |
| 30 | Clearstead Advisors#30 · 4 sh | 4 | $8.00 | 0.00% | 0.0% |
| 31 | BESSEMER GROUP#31 · 6 sh | 6 | $0.00 | 0.00% | New |
| 32 | FMR#32 · 0 sh | 0 | $0.00 | 0.00% | New |
Funds that sold out of ATOS in Q2 2026 (6)
Held ATOS at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.
| Institution | Shares sold | Value in Q1 2026 |
|---|---|---|
| Tower Research Capital (TRC)863 sh | 863 | $4.5K |
| Avion Wealth318 sh | 318 | $1.0K |
| Robinswood Financial170 sh | 170 | $894.00 |
| North Star Investment Management80 sh | 80 | $421.00 |
| NORTHWESTERN MUTUAL WEALTH MANAGEMENT46 sh | 46 | $242.00 |
| Allworth Financial46 sh | 46 | $242.00 |
Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.