ATOS
Atossa Therapeutics, Inc.
$2.12
+0.08 (+3.92%)
At close · Jul 2
Market Cap
$18.26M
Shares
8,611,361
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Holders: 34
Total Value: $6,811,570
Total Shares: 1,294,979
Institutional Ownership Trend
3 quarters
Holder Concentration
Across 34 13F filers · Δ vs Dec 31, 2025Top Holder
27.0%
−73.0 pts
Top 5
72.9%
−27.1 pts
Top 10
96.5%
−3.5 pts
HHI
1,472
Broadly held−8,528
Quarterly Activity
vs Dec 31, 2025
New
34
Increased
0
Decreased
0
Sold Out
1
Unchanged
0
Holder count:
+33
Institutional value:
+2641.8%
Shares held:
+4513.1%
Top New Positions
vs Dec 31, 2025| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Mega VANGUARD CAPITAL MANAGEMENT LLC | 349,096 | $1,836,244 | |
| Mega AMERIPRISE FINANCIAL INC | 255,134 | $1,342,004 | |
| Mega BlackRock, Inc. | 133,169 | $700,468 | |
| Large RENAISSANCE TECHNOLOGIES LLC | 109,007 | $573,376 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC | 97,061 | $510,540 |
Top Sold-Out Positions
vs Dec 31, 2025| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Large MARSHALL WACE, LLP | 28,072 | $248,437 |
| Holder | Value (USD) | % of 13F | Shares | Type | Discretion | Filed | Open | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Mega VANGUARD CAPITAL MANAGEMENT LLC | $1,836,244 | 26.96% | 349,096 | Shares | Defined | 2026-05-15 | ||||
| Mega AMERIPRISE FINANCIAL INC | $1,342,004 | 19.70% | 255,134 | Shares | Defined | 2026-05-15 | ||||
| Mega BlackRock, Inc. | $700,468 | 10.28% | 133,169 | Shares | Sole | 2026-05-13 | ||||
| Large RENAISSANCE TECHNOLOGIES LLC | $573,376 | 8.42% | 109,007 | Shares | Sole | 2026-05-14 | ||||
| Mega GEODE CAPITAL MANAGEMENT, LLC | $510,540 | 7.50% | 97,061 | Shares | Defined | 2026-05-15 | ||||
| Mega UBS Group AG | $484,098 | 7.11% | 92,034 | Shares | Defined | 2026-05-05 | ||||
| Mega MILLENNIUM MANAGEMENT LLC | $351,047 | 5.15% | 66,739 | Shares | Sole | 2026-05-15 | ||||
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $289,300 | 4.25% | 55,000 | Put | Other | 2026-05-15 | ||||
| Mega VANGUARD FIDUCIARY TRUST CO Bank | $274,756 | 4.03% | 52,235 | Shares | Defined | 2026-05-08 | ||||
| Mega STATE STREET CORP | $209,142 | 3.07% | 39,761 | Shares | Defined | 2026-05-15 | ||||
| Mega NORTHERN TRUST CORP Bank | $101,118 | 1.48% | 19,224 | Shares | Defined | 2026-05-14 | ||||
| Mega MORGAN STANLEY | $85,222 | 1.25% | 16,202 | Shares | Defined | 2026-05-15 | ||||
| Mega Vanguard Global Advisers, LLC | $16,248 | 0.24% | 3,089 | Shares | Defined | 2026-05-08 | ||||
| Large JONES FINANCIAL COMPANIES LLLP | $10,840 | 0.16% | 2,061 | Shares | Sole | 2026-05-15 | ||||
| Mid Tower Research Capital LLC (TRC) | $4,539 | 0.07% | 863 | Shares | Defined | 2026-05-15 | ||||
| Mega ROYAL BANK OF CANADA Bank | $3,387 | 0.05% | 644 | Shares | Defined | 2026-05-15 | ||||
| Mid GROUP ONE TRADING LLC | $3,203 | 0.05% | 609 | Shares | Sole | 2026-05-13 | ||||
| Large OSAIC HOLDINGS, INC. | $3,087 | 0.05% | 587 | Shares | Defined | 2026-05-15 | ||||
| Mega JPMORGAN CHASE & CO | $2,014 | 0.03% | 383 | Shares | Defined | 2026-05-13 | ||||
| Large Rockefeller Capital Management L.P. | $1,856 | 0.03% | 353 | Shares | Defined | 2026-05-14 | ||||
| Large NewEdge Advisors, LLC | $1,751 | 0.03% | 333 | Shares | Sole | 2026-06-03 | ||||
| Micro Avion Wealth | $1,672 | 0.02% | 318 | Shares | Sole | 2026-05-01 | ||||
| Mega WELLS FARGO & COMPANY/MN | $1,556 | 0.02% | 296 | Shares | Defined | 2026-05-11 | ||||
| Micro Robinswood Financial LLC | $894 | 0.01% | 170 | Shares | Sole | 2026-06-09 | ||||
| Mid SBI Securities Co., Ltd. Broker-Dealer | $594 | 0.01% | 113 | Shares | Defined | 2026-04-28 | ||||
| Mid HARBOUR INVESTMENTS, INC. | $578 | 0.01% | 110 | Shares | Sole | 2026-05-15 | ||||
| Large TD Waterhouse Canada Inc. | $541 | 0.01% | 103 | Shares | Defined | 2026-05-12 | ||||
| Mega BNP PARIBAS ARBITRAGE, SA | $515 | 0.01% | 98 | Shares | Defined | 2026-05-12 | ||||
| Mid North Star Investment Management Corp. | $420 | 0.01% | 80 | Shares | Sole | 2026-04-23 | ||||
| Large NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO | $241 | 0.00% | 46 | Shares | Defined | 2026-05-07 | ||||
| Mid Allworth Financial LP | $241 | 0.00% | 46 | Shares | Sole | 2026-05-15 | ||||
| Micro Napier Financial, LLC | $31 | 0.00% | 6 | Shares | Sole | 2026-05-05 | ||||
| Mid Bogart Wealth, LLC | $26 | 0.00% | 5 | Shares | Sole | 2026-04-28 | ||||
| Mid Clearstead Advisors, LLC | $21 | 0.00% | 4 | Shares | Sole | 2026-05-06 | ||||
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