ATOS · Atossa Therapeutics, Inc. · Holdings

$2.48 -0.03 (-1.20%) At close · Sep 14

Market Cap

$25.20M

9.98M

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.

Use institutional holdings through the 13F API or MCP →

Quarter:

Holders: 32

Total Value: $2,618,184

Total Shares: 1,356,583

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 32 13F filers · Δ vs Mar 31, 2026

Top Holder

26.7%

−0.3 pts

Top 5

74.4%

+1.5 pts

Top 10

94.9%

−1.6 pts

HHI

1,458

Broadly held−15

Quarterly Activity

vs Mar 31, 2026

New

Increased

Decreased

Sold Out

Unchanged

Holder count: -2

Institutional value: -61.6%

Shares held: +4.8%

Top Buyers

vs Mar 31, 2026

Institution	Added	Now Holds
Mega BlackRock, Inc.	+31,189	164,358
Large RENAISSANCE TECHNOLOGIES LLC	+23,036	132,043
Mega VANGUARD CAPITAL MANAGEMENT LLC	+12,651	361,747
Mega AMERIPRISE FINANCIAL INC	+3,100	258,234
Mega ROYAL BANK OF CANADA	+1,350	1,994

Top Sellers

vs Mar 31, 2026

Institution	Sold	Now Holds
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP	−28,126	26,874
Mega MILLENNIUM MANAGEMENT LLC	−20,231	46,508
Mega UBS Group AG	−9,414	82,620
Mega GEODE CAPITAL MANAGEMENT, LLC	−4,679	92,382
Mega MORGAN STANLEY	−3,857	12,345

Top New Positions

vs Mar 31, 2026

Institution	Acquired	Value (USD)
Mega JANE STREET GROUP, LLC	56,602	$109,241
Small MCF Advisors LLC	1,066	$2,057
Large BESSEMER GROUP INC	6	$11
Small Caitong International Asset Management Co., Ltd	6	$11
Mega FMR LLC	0	$0

Top Sold-Out Positions

vs Mar 31, 2026

Institution	Previously Held	Last Value (USD)
Mid Tower Research Capital LLC (TRC)	863	$4,539
Large NewEdge Advisors, LLC	333	$1,751
Micro Robinswood Financial LLC	170	$894
Mid North Star Investment Management Corp.	80	$420
Large NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO	46	$241

Filter: New 5 Increased 9 Reduced 9 Sold out 7 Unchanged 9

Showing 33 of 33

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

VANGUARD CAPITAL MANAGEMENT LLC

$698,171

26.67%

361,747

AMERIPRISE FINANCIAL INC

$498,391

19.04%

258,234

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Columbia Management Investment Advisers, LLC	258,153	$498,235	100.0%	Defined
Ameriprise Financial Services, LLC	81	$156	0.0%	Defined

BlackRock, Inc.

$317,209

12.12%

164,358

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BlackRock Investment Management, LLC	1,986	$3,832	1.2%	Sole
BlackRock Fund Advisors	30,155	$58,199	18.3%	Sole
BlackRock Institutional Trust Company, N.A.	132,217	$255,178	80.4%	Sole

RENAISSANCE TECHNOLOGIES LLC

$254,842

9.73%

132,043

GEODE CAPITAL MANAGEMENT, LLC

$178,297

6.81%

92,382

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GEODE CAPITAL MANAGEMENT TRUST COMPANY, LLC	19,426	$37,492	21.0%	Defined
Held directly	72,956	$140,805	79.0%	Defined

UBS Group AG

$159,456

6.09%

82,620

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS Financial Services Inc	66	$127	0.1%	Defined
UBS AG	82,554	$159,329	99.9%	Defined

JANE STREET GROUP, LLC

$109,241

4.17%

56,602

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	46,526	$89,795	82.2%	Defined
Jane Street Global Trading, LLC	10,076	$19,446	17.8%	Defined

VANGUARD FIDUCIARY TRUST CO

$101,485

3.88%

52,583

MILLENNIUM MANAGEMENT LLC

$89,760

3.43%

46,508

STATE STREET CORP

$76,738

2.93%

39,761

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STATE STREET GLOBAL ADVISORS TRUST COMPANY	39,761	$76,738	100.0%	Defined

NORTHERN TRUST CORP

$39,080

1.49%

20,249

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
NORTHERN TRUST CO joint	20,249	$39,080	100.0%	Defined

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$30,057

1.15%

15,574

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	15,574	$30,057	100.0%	Other

MORGAN STANLEY

$23,825

0.91%

12,345

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MORGAN STANLEY & CO INTERNATIONAL PLC	10,666	$20,585	86.4%	Defined
MORGAN STANLEY SMITH BARNEY LLC	1,679	$3,240	13.6%	Defined

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$21,809

0.83%

11,300

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	11,300	$21,809	100.0%	Other

Vanguard Global Advisers, LLC

$5,961

0.23%

3,089

JONES FINANCIAL COMPANIES LLLP

$3,977

0.15%

2,061

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Edward D. Jones & Co., L.P.	2,061	$3,977	100.0%	Sole

ROYAL BANK OF CANADA

$3,848

0.15%

1,994

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
RBC Capital Markets, LLC	1,994	$3,848	100.0%	Defined

MCF Advisors LLC

$2,057

0.08%

1,066

OSAIC HOLDINGS, INC.

$1,132

0.04%

587

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
OSAIC WEALTH, INC.	587	$1,132	100.0%	Defined

JPMORGAN CHASE & CO

$752

0.03%

390

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
J.P. Morgan Securities LLC	390	$752	100.0%	Defined

Rockefeller Capital Management L.P.

$642

0.02%

333

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
ROCKEFELLER FINANCIAL LLC	333	$642	100.0%	Defined

WELLS FARGO & COMPANY/MN

$439

0.02%

228

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
WELLS FARGO ADVISORS FINANCIAL NETWORK, LLC	223	$430	97.9%	Defined
WELLS FARGO CLEARING SERVICES, LLC	5	$9	2.1%	Defined

SBI Securities Co., Ltd.

$285

0.01%

148

HARBOUR INVESTMENTS, INC.

$212

0.01%

110

TD Waterhouse Canada Inc.

$198

0.01%

103

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
TORONTO DOMINION BANK	103	$198	100.0%	Defined

BNP PARIBAS ARBITRAGE, SA

$167

0.01%

GROUP ONE TRADING LLC

$104

0.00%

Napier Financial, LLC

$11

0.00%

Caitong International Asset Management Co., Ltd

$11

0.00%

BESSEMER GROUP INC

$11

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BESSEMER TRUST Co NATIONAL ASSOCIATION	6	$11	100.0%	Defined

Bogart Wealth, LLC

0.00%

Clearstead Advisors, LLC

0.00%

FMR LLC

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STRATEGIC ADVISERS LLC	0	$0	—	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Latour Trading LLC (Latour)	863	$4,539	100.0%	Defined

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