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
2025
Q4 		– Sell
-21
Closed -$266 – 8505
2025
Q3 		$0 Buy
+21
New +$259 ﹤0.01% 9019
2025
Q2 		– Sell
-276
Closed -$3.3K – 8587
2025
Q1 		$2K Buy
276
+235
+573% +$2.85K ﹤0.01% 7924
2024
Q4 		$0 Buy
+41
New +$800 ﹤0.01% 8467
2024
Q2 		– Sell
-3,706
Closed -$82K – 8735
2024
Q1 		$100K Buy
+3,706
New +$59.5K ﹤0.01% 5567
2023
Q1 		– Sell
-220
Closed -$2.45K – 8977
2022
Q4 		$1K Buy
220
+7
+3% +$80 ﹤0.01% 8749
2022
Q3 		$2K Sell
213
-127
-37% -$1.84K ﹤0.01% 9225
2022
Q2 		$5K Hold
340
– – ﹤0.01% 8789
2022
Q1 		$6K Sell
340
-400
-54% -$8.13K ﹤0.01% 9256
2021
Q4 		$17K Sell
740
-5,328
-88% -$195K ﹤0.01% 8530
2021
Q3 		$582K Sell
6,068
-3,368
-36% -$196K ﹤0.01% 3860
2021
Q2 		$894K Buy
+9,436
New +$500K ﹤0.01% 3281
2021
Q1 		– Sell
-27
Closed -$987 – 8756
2020
Q4 		$0 Buy
27
+19
+238% +$440 ﹤0.01% 8304
2020
Q3 		$0 Buy
+8
New +$384 ﹤0.01% 7757

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.