Atossa Therapeutics, Inc.: which funds bought and sold

Institutions that bought and sold Atossa Therapeutics shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.

Between March 31, 2026 and June 30, 2026, 13 institutions that filed 13F reports for both quarters added to or opened positions in Atossa Therapeutics, and 14 cut or closed them. Together they added a net 106K shares, +8.5% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 2,805 shares (+1.6%); index fund managers were net buyers of 41K shares (+5.9%). 4 opened a new position and 6 sold out entirely.

Bought, Q2 2026 13 institutions, 4 of them new holders Sold, Q2 2026 14 institutions, 6 of them sold out

Net change, all compared +106K shares (+8.5%)

Net change, active managers +2,805 shares (+1.6%), 1 bought, 1 sold

Buyers versus sellers

institutions compared, 36

13 bought 9 14 sold

Active managers and hedge funds 1 bought · 1 sold · +2,805

Index fund managers 4 bought · 1 sold · +41K

Other institutions 8 bought · 12 sold · +62K

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
Jane Street Group, LLC	+57K New position	57K	$109,242
Blackrock, Inc. Index funds	+31K +23.4%	164K	$317,211
Renaissance Technologies LLC Hedge fund	+23K +21.1%	132K	$254,843
Susquehanna International Group, LLP	+16K New position	16K	$30,058
Vanguard Capital Management LLC Index funds	+13K +3.6%	362K	$698,172
Ameriprise Financial Inc	+3,100 +1.2%	258K	$498,392
Royal Bank Of Canada	+1,350 +209.6%	1,994	$4,000
Mcf Advisors LLC	+1,066 New position	1,066	$2,058
Northern Trust Corp Index funds	+1,025 +5.3%	20K	$39,081
Vanguard Fiduciary Trust Co Index funds	+348 +0.7%	53K	$101,485
Sbi Securities Co., Ltd.	+35 +31.0%	148	$286
Jpmorgan Chase & Co	+7 +1.8%	390	$772
Caitong International Asset Management Co., Ltd	+6 New position	6	$12

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Renaissance Technologies LLC Hedge fund	+23K +21.1%	132K	$254,843

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Millennium Management LLC Hedge fund	−20K −30.3%	47K	$89,760
UBS Group AG	−9,414 −10.2%	83K	$159,456
Geode Capital Management, LLC Index funds	−4,679 −4.8%	92K	$178,343
Morgan Stanley	−3,857 −23.8%	12K	$23,825
Tower Research Capital LLC (TRC)	−863 Sold out	0	—
Group One Trading LLC	−555 −91.1%	54	$104
Newedge Advisors, LLC	−333 Sold out	0	—
Robinswood Financial LLC	−170 Sold out	0	—
North Star Investment Management Corp.	−80 Sold out	0	—
Wells Fargo & Company	−68 −23.0%	228	$440
Allworth Financial LP	−46 Sold out	0	—
Northwestern Mutual Wealth Management Co	−46 Sold out	0	—
Rockefeller Capital Management L.P.	−20 −5.7%	333	$643
BNP Paribas Financial Markets	−11 −11.2%	87	$168

New positions

largest by value

Institution	Shares	Value June 30, 2026
Jane Street Group, LLC	57K	$109,242
Susquehanna International Group, LLP	16K	$30,058
Mcf Advisors LLC	1,066	$2,058
Caitong International Asset Management Co., Ltd	6	$12

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Tower Research Capital LLC (TRC)	863	$4,539
Newedge Advisors, LLC	333	$1,752
Robinswood Financial LLC	170	$894
North Star Investment Management Corp.	80	$421
Allworth Financial LP	46	$242
Northwestern Mutual Wealth Management Co	46	$242

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 30
Ten largest holders: 95.7%
Index fund managers: 54.3%
Active managers and hedge funds: 13.3%

Buying and selling by type of institution, March 31, 2026 to June 30, 2026
Type	Bought	Sold	New	Sold out	Net change in shares	Net %
Active managers and hedge funds	1	1	0	0	+2,805	+1.6%
Index fund managers	4	1	0	0	+41K	+5.9%
Other institutions	8	12	4	6	+62K	+16.7%

Active managers and hedge funds: a list we maintain of about 400 well-known stock-picking firms and hedge funds, matched by SEC registration number (CIK) and checked against the filer names each quarter. Index fund managers: the large index houses, such as BlackRock, Vanguard, State Street, Geode and Northern Trust. Every other filer (banks, brokers, wealth managers, pension funds, insurers and firms not on the list) counts as another institution. A firm that files under several SEC registrations appears once for each.

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