ATOS Institutional Ownership
Who owns Atossa Therapeutics, Inc. and what the big funds did with it last quarter, from every SEC 13F filing. 31 funds reported holding ATOS at Jun 30, 2026, together owning 13.5% of the company.
- ●14 buying vs 15 selling
- ▲Held by funds +1.1 pts
- ▼Funds holding -2
- ●Superinvestors: 1 added, 1 cut
- ●Put/call not meaningful
What the filings show, not a forecast. Positions can be up to 45 days old and leave out short sales.
Funds holding and ownership
8 quartersQuarter over quarter
all 13F filers| Q2 2026 | This quarter | Q1 2026 | Change |
|---|---|---|---|
| Funds holding | 31 | 33 | −6.1% |
| In funds' top 10 | 0 | 0 | – |
| 13F shares | 1.3M | 1.2M | +8.5% |
| Held by funds | 13.5% | 12.4% | +1.1 pts |
| New positions | 5 | 30 | −83.3% |
| Increased | 9 | 0 | – |
| Reduced | 8 | 0 | – |
| Sold out | 7 | 65 | −89.2% |
| Calls (shares) | 0 | 0 | – |
| Puts (shares) | 0 | 0 | – |
| Put/call ratio | – | – | – |
Buyers vs sellers
adding or new vs cutting or sold outSuperinvestors in ATOS
All superinvestors →
Who owns ATOS
share of fund held shares- Index and passive funds54.6%
- Active managers and hedge funds13.5%
- Banks and brokers32.0%
- Pensions, insurers and other0.0%
The top 10 holders own 95.7% of all ATOS shares that funds reported. Groups are our own grouping of filers by name.
Filed so far for Q3 2026
4 funds changed their position- MCF Advisors LLCSold out−1,066 sh
- Rydar Equities, Inc.New+333 sh
- IFP Advisors, IncNew+29 sh
- Caitong International Asset Management Co., LtdAdded+2 sh
Top holders
Q2 2026| # | Fund | Of company | Shares | Value | Change |
|---|---|---|---|---|---|
| 1 | Vanguard Capital Management LLC | 3.62% | 362K | $698K | +13K |
| 2 | Ameriprise Financial Inc | 2.59% | 258K | $498K | +3,100 |
| 3 | BlackRock, Inc. | 1.65% | 164K | $317K | +31K |
| 4 | Renaissance Technologies LLC | 1.32% | 132K | $255K | +23K |
| 5 | Geode Capital Management, LLC | 0.93% | 92K | $178K | −4,679 |
| 6 | UBS Group AG | 0.83% | 83K | $159K | −9,414 |
| 7 | Jane Street Group, LLC | 0.57% | 57K | $109K | +57K |
| 8 | Vanguard Fiduciary Trust Co | 0.53% | 53K | $101K | +348 |
| 9 | Millennium Management LLC | 0.47% | 47K | $90K | −20K |
| 10 | State Street Corp | 0.40% | 40K | $77K | 0 |
- Jane Street Group, LLC+57K sh+$109K
- BlackRock, Inc.+31K sh+$60K
- Renaissance Technologies LLC+23K sh+$44K
- Susquehanna International Group, LLP+16K sh+$30K
- Vanguard Capital Management LLC+13K sh+$24K
- Ameriprise Financial Inc+3,100 sh+$6K
- Royal Bank of Canada+1,350 sh+$3K
- MCF Advisors LLC+1,066 sh+$2K
- Millennium Management LLC−20K sh−$39K
- UBS Group AG−9,414 sh−$18K
- Geode Capital Management, LLC−4,679 sh−$9K
- Morgan Stanley−3,857 sh−$7K
- Tower Research Capital LLC (TRC)−863 sh−$5K
- NewEdge Advisors, LLC−333 sh−$2K
- Group One Trading LLC−555 sh−$1K
- Avion Wealth−318 sh−$1K
ATOS institutional ownership FAQ
Who owns the most ATOS stock?
In Q2 2026 13F filings the largest holder of ATOS was Vanguard Capital Management LLC, followed by Ameriprise Financial Inc and BlackRock, Inc.. Index fund managers are usually the biggest holders of large companies.
What percentage of ATOS is owned by institutions?
Funds that file 13F reports held 13.5% of ATOS's shares at Jun 30, 2026, compared with 12.4% a quarter earlier. That counts every manager with more than $100 million in US stocks.
Are hedge funds buying ATOS?
In Q2 2026, 14 funds bought ATOS (5 of them new positions) and 15 sold (7 sold out completely). Among well known investors, 1 added and 1 cut. Our fund sentiment for ATOS is neutral.
What is ATOS's institutional put/call ratio?
Too few option positions were reported for a meaningful ratio.
How current is this ATOS ownership data?
13F filings show holdings at the end of each quarter and are due within 45 days, so positions can be up to six weeks old when they appear. We add each new filing within minutes, and the "filed so far" list shows funds that have already reported the next quarter.
For informational and educational purposes only. Not investment advice, and not a recommendation to buy or sell any security. Fund sentiment summarises what 13F filings show and is not a forecast. Holdings come from SEC Form 13F filings as reported and show positions at the end of the quarter, up to 45 days before the filing. A 13F leaves out short positions, cash, bonds and most foreign holdings. See all hedge fund holdings.