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XTX Topco’s Quantum-Si Incorporated QSI Stock Holding History

XTX Topco’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 		$157K Sell
177,680
-211,574
-54% -$201K ﹤0.01% 3365
2026
Q1 		$301K Sell
389,254
-72,728
-16% -$75.4K 0.01% 2476
2025
Q4 		$508K Buy
461,982
+311,450
+207% +$507K 0.01% 1585
2025
Q3 		$212K Buy
150,532
+104,058
+224% +$150K 0.01% 1798
2025
Q2 		$91.1K Sell
46,474
-322,494
-87% -$477K ﹤0.01% 1900
2025
Q1 		$443K Buy
368,968
+123,383
+50% +$236K 0.02% 1121
2024
Q4 		$663K Buy
245,585
+201,773
+461% +$236K 0.05% 536
2024
Q3 		$38.7K Buy
43,812
+19,651
+81% +$19.1K ﹤0.01% 1734
2024
Q2 		$25.4K Buy
+24,161
New +$38.7K ﹤0.01% 1591
2023
Q3 		– Sell
-44,168
Closed -$79.1K – 1929
2023
Q2 		$79.1K Buy
+44,168
New +$69.2K 0.01% 1187
2022
Q3 		– Sell
-25,530
Closed -$59K – 1332
2022
Q2 		$59K Buy
+25,530
New +$97.8K 0.02% 729

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

XTX Topco's QSI Position: Q2 2026 in Review

XTX Topco reduced its Quantum-Si Incorporated (QSI) stake by 54% in Q2 2026, selling an estimated $201K and leaving 177,680 shares worth $157K. The position accounts for ﹤0.01% of the portfolio, ranked #3365.

XTX Topco first reported a position in QSI in Q2 2022 and has held it in 11 quarters since. The position peaked at $663K in Q4 2024. 141 funds tracked by Wall St. Rank hold QSI as of Q2 2026.

  • XTX Topco held 177,680 shares of Quantum-Si Incorporated worth $157K as of Q2 2026.
  • XTX Topco sold 211,574 Quantum-Si Incorporated shares in Q2 2026, an estimated $201K.
  • Quantum-Si Incorporated made up ﹤0.01% of XTX Topco's portfolio in Q2 2026, its #3365 holding.
  • XTX Topco first reported a position in Quantum-Si Incorporated in Q2 2022 and has held it in 11 quarters since.
  • XTX Topco's Quantum-Si Incorporated position peaked at $663K in Q4 2024.
  • 141 funds tracked by Wall St. Rank held Quantum-Si Incorporated as of Q2 2026.

Based on XTX Topco's 13F filing for Q2 2026, filed 14 Aug 2026.