Simplex Trading
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Simplex Trading’s Atossa Therapeutics ATOS Stock Holding History

Simplex Trading’s Portfolio ATOS Stock Details ATOS Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		– Sell
-15,800
Closed -$83.1K – 9258
2026
Q1 		$83.1K Buy
+15,800
New +$100K ﹤0.01% 5302
2025
Q2 		– Sell
-100
Closed -$1K – 8588
2025
Q1 		$1K Buy
+100
New +$1.21K ﹤0.01% 8142
2024
Q3 		– Sell
-253
Closed -$4K – 8428
2024
Q2 		$4K Sell
253
-1,114
-81% -$24.6K ﹤0.01% 7942
2024
Q1 		$36K Sell
1,367
-820
-37% -$13.2K ﹤0.01% 6572
2023
Q4 		$28K Sell
2,187
-706
-24% -$7.62K ﹤0.01% 6615
2023
Q3 		$31K Buy
2,893
+73
+3% +$1.06K ﹤0.01% 6216
2023
Q2 		$53K Hold
2,820
– – ﹤0.01% 5784
2023
Q1 		$30K Hold
2,820
– – ﹤0.01% 6481
2022
Q4 		$22K Sell
2,820
-10,207
-78% -$117K ﹤0.01% 6761
2022
Q3 		$162K Sell
13,027
-206
-2% -$2.99K ﹤0.01% 4891
2022
Q2 		$216K Sell
13,233
-2,967
-18% -$46.7K ﹤0.01% 4505
2022
Q1 		$303K Sell
16,200
-4,913
-23% -$99.8K ﹤0.01% 4538
2021
Q4 		$506K Buy
21,113
+2,833
+15% +$104K ﹤0.01% 3786
2021
Q3 		$1.75M Sell
18,280
-1,100
-6% -$64K ﹤0.01% 2328
2021
Q2 		$1.84M Buy
19,380
+19,325
+35,136% +$1.02M ﹤0.01% 2277
2021
Q1 		$173K Buy
55
+50
+1,000% +$1.83K ﹤0.01% 4963
2020
Q4 		$7K Buy
+5
New +$116 ﹤0.01% 7566

Other funds holding ATOS

Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Ameriprise
Ameriprise Minneapolis, Minnesota $495B AUM 43.24% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Renaissance Technologies
Renaissance Technologies New York $72.6B AUM 54.88% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $786B AUM 40.34% 1-Year Est. Return
Jane Street
Jane Street New York $1.21T AUM 78.12% 1-Year Est. Return
Vanguard Fiduciary Trust
Vanguard Fiduciary Trust Malvern, Pennsylvania $454B AUM
Millennium Management
Millennium Management New York $276B AUM 44.8% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Simplex Trading's ATOS Position: Q4 2025 in Review

Simplex Trading sold out of Atossa Therapeutics (ATOS) in Q4 2025, closing a stake of 21 shares — an estimated $266 sold.

Simplex Trading first reported a position in ATOS in Q3 2020 and held it in 13 quarters. The position peaked at $894K in Q2 2021. 67 funds tracked by Wall St. Rank hold ATOS as of Q4 2025.

  • Simplex Trading reported no remaining Atossa Therapeutics position as of Q4 2025 after selling out during the quarter.
  • Simplex Trading sold 21 Atossa Therapeutics shares in Q4 2025, an estimated $266.
  • Simplex Trading first reported a position in Atossa Therapeutics in Q3 2020 and held it in 13 quarters.
  • Simplex Trading's Atossa Therapeutics position peaked at $894K in Q2 2021.
  • 67 funds tracked by Wall St. Rank held Atossa Therapeutics as of Q4 2025.

Based on Simplex Trading's 13F filing for Q4 2025, filed 11 Feb 2026.