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Atossa Therapeutics
ATOS

83 hedge funds and large institutions have $19.1M invested in Atossa Therapeutics in 2025 Q1 according to their latest regulatory filings, with 9 funds opening new positions, 18 increasing their positions, 29 reducing their positions, and 12 closing their positions.

New
Increased
Maintained
Reduced
Closed

112% more call options, than puts

Call options by funds: $123K | Put options by funds: $58K

0.12% less ownership

Funds ownership: 1.59% → 1.46% (-0.12%)

3% less funds holding

Funds holding: 86 → 83 (-3)

25% less first-time investments, than exits

New positions opened: 9 | Existing positions closed: 12

32% less capital invested

Capital invested by funds: $28.3M → $19.1M (-$9.17M)

38% less repeat investments, than reductions

Existing positions increased: 18 | Existing positions reduced: 29

Holders
83
Holders Change
-3
Holders Change %
-3.49%
% of All Funds
1.11%
Holding in Top 10
–
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
–
New
9
Increased
18
Reduced
29
Closed
12
Calls
$123K
Puts
$58K
Net Calls
+$65K
Net Calls Change
+$4K

Top Buyers

Rank Fund Capital Flow
1
Squarepoint
Squarepoint
New York
+$388K
2
Renaissance Technologies
Renaissance Technologies
New York
+$241K
3
Susquehanna International Group
Susquehanna International Group
Pennsylvania
+$173K
4
Charles Schwab
Charles Schwab
California
+$97.9K
5
Group One Trading
Group One Trading
Illinois
+$34.6K

Top Sellers

Rank Fund Capital Flow
1
UBS Group
UBS Group
Switzerland
-$542K
2
Citadel Advisors
Citadel Advisors
Florida
-$346K
3
VF
Virtu Financial
New York
-$197K
4
JP Morgan Chase
JP Morgan Chase
New York
-$196K
5
Morgan Stanley
Morgan Stanley
New York
-$136K
Name Holding Trade Value Shares
Change 		Change in
Stake
AF
76
Allworth Financial
California
$515 – – –
Jones Financial Companies
77
Jones Financial Companies
Missouri
$487 +$571 +47 New
RA
78
Rise Advisors
New York
$437 +$522 +43 New
EWA
79
EverSource Wealth Advisors
Alabama
$71 +$61 +5 +250%
CA
80
Clearstead Advisors
Ohio
$48 – – –
TWD
81
True Wealth Design
Ohio
$47 +$61 +5 New
LFG
82
Larson Financial Group
Missouri
$13 -$73 -6 -86%
Citadel Advisors
83
Citadel Advisors
Florida
– -$346K -28,521 Closed
VF
84
Virtu Financial
New York
– -$197K -13,880 Closed
Jane Street
85
Jane Street
New York
– -$120K -8,447 Closed
Two Sigma Investments
86
Two Sigma Investments
New York
– -$84.8K -5,989 Closed
XT
87
XTX Topco
Cayman Islands
– -$74.8K -5,278 Closed
Cetera Investment Advisers
88
Cetera Investment Advisers
Illinois
– -$32.3K -2,282 Closed
HF
89
HRT Financial
New York
– -$29K -2,100 Closed
Millennium Management
90
Millennium Management
New York
– -$27.5K -1,943 Closed
TSS
91
Two Sigma Securities
New York
– -$21.1K -1,488 Closed
KOC
92
Koss-Olinger Consulting
Florida
– -$11K -800 Closed
SJIM
93
St. Johns Investment Management
Florida
– -$1.46K -103 Closed
RS
94
R Squared
Hong Kong
– -$963 -68 Closed
1 2 3
4

ATOS Hedge Fund Activity: Q1 2025 in Review

83 of the 7,458 institutional investors tracked by Wall St. Rank reported a position in Atossa Therapeutics (ATOS) for Q1 2025, worth a combined $19.1M — down 32% from $28.3M a quarter earlier.

Sellers outnumbered buyers: 12 funds closed out of ATOS and 9 opened new positions — a net loss of 3 holders — while 29 trimmed existing stakes and 18 added.

The largest buyer was Squarepoint, opening a new position worth an estimated $388K. The largest seller was UBS Group, cutting an estimated $542K.

  • 83 institutional investors held Atossa Therapeutics (ATOS) as of Q1 2025, down from 86 in Q4 2024.
  • Funds reported $19.1M of Atossa Therapeutics stock for Q1 2025, down 32% quarter-over-quarter.
  • 9 funds opened new Atossa Therapeutics positions in Q1 2025 and 12 closed out, a net change of -3 holders.
  • The largest Atossa Therapeutics buyer in Q1 2025 was Squarepoint, an estimated $388K added.
  • The largest Atossa Therapeutics seller in Q1 2025 was UBS Group, an estimated $542K sold.

Based on aggregated 13F filings for Q1 2025.