Simplex Trading
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Simplex Trading’s Quantum-Si Incorporated QSI Stock Holding History

Simplex Trading’s Portfolio QSI Stock Details QSI Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$35.1K Sell
39,700
-34,200
-46% -$32.6K ﹤0.01% 6624
2026
Q1 		$57.2K Sell
73,900
-117,700
-61% -$122K ﹤0.01% 5723
2025
Q4 		$211K Buy
191,600
+57,400
+43% +$93.4K ﹤0.01% 4178
2025
Q3 		$189K Sell
134,200
-10,000
-7% -$14.5K ﹤0.01% 5002
2025
Q2 		$282K Sell
144,200
-60,500
-30% -$89.5K ﹤0.01% 4147
2025
Q1 		$245K Buy
204,700
+105,100
+106% +$201K ﹤0.01% 4110
2024
Q4 		$268K Buy
+99,600
New +$117K ﹤0.01% 4191
2024
Q2 		– Sell
-1,100
Closed -$2K – 9616
2024
Q1 		$2K Sell
1,100
-7,600
-87% -$13.3K ﹤0.01% 8446
2023
Q4 		$17K Buy
8,700
+4,500
+107% +$6.86K ﹤0.01% 7058
2023
Q3 		$6K Buy
+4,200
New +$10.1K ﹤0.01% 7561
2023
Q1 		– Sell
-12,300
Closed -$22K – 9922
2022
Q4 		$22K Sell
12,300
-1,400
-10% -$3.61K ﹤0.01% 6790
2022
Q3 		$37K Sell
13,700
-9,000
-40% -$28.8K ﹤0.01% 6823
2022
Q2 		$52K Buy
22,700
+16,600
+272% +$63.6K ﹤0.01% 6442
2022
Q1 		$28K Buy
6,100
+1,900
+45% +$9.26K ﹤0.01% 7862
2021
Q4 		$33K Sell
4,200
-118,800
-97% -$895K ﹤0.01% 7780
2021
Q3 		$1.48M Hold
123,000
– – ﹤0.01% 2555
2021
Q2 		$1.51M Buy
123,000
+121,886
+10,941% +$1.28M ﹤0.01% 2556
2021
Q1 		$1.33M Buy
+1,114
New +$13.5K ﹤0.01% 2089

Other funds holding QSI

Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
AIM
ARK Investment Management St. Petersburg, Florida $15.4B AUM 50.29% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
NAMA
Nikko Asset Management Americas New York $7.75B AUM 33.73% 1-Year Est. Return
Sumitomo Mitsui Trust Group
Sumitomo Mitsui Trust Group Minato-Ku, Tokyo, Japan $175B AUM 40.63% 1-Year Est. Return
Millennium Management
Millennium Management New York $276B AUM 44.8% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $786B AUM 40.34% 1-Year Est. Return
AQR Capital Management
AQR Capital Management Greenwich, Connecticut $287B AUM 42.33% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Jane Street
Jane Street New York $1.21T AUM 78.12% 1-Year Est. Return

Simplex Trading's QSI Position: Q2 2026 in Review

Simplex Trading increased its Quantum-Si Incorporated (QSI) stake by 83% in Q2 2026, buying an estimated $71.2K and bringing the position to 165,293 shares worth $146K. The position accounts for ﹤0.01% of the portfolio, ranked #5102.

Simplex Trading first reported a position in QSI in Q1 2021 and has held it in 14 quarters since. The position peaked at $828K in Q4 2024. 141 funds tracked by Wall St. Rank hold QSI as of Q2 2026.

  • Simplex Trading held 165,293 shares of Quantum-Si Incorporated worth $146K as of Q2 2026.
  • Simplex Trading bought 74,762 Quantum-Si Incorporated shares in Q2 2026, an estimated $71.2K.
  • Quantum-Si Incorporated made up ﹤0.01% of Simplex Trading's portfolio in Q2 2026, its #5102 holding.
  • Simplex Trading first reported a position in Quantum-Si Incorporated in Q1 2021 and has held it in 14 quarters since.
  • Simplex Trading's Quantum-Si Incorporated position peaked at $828K in Q4 2024.
  • 141 funds tracked by Wall St. Rank held Quantum-Si Incorporated as of Q2 2026.

Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.