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John Overdeck’s Quantum-Si Incorporated QSI Stock Holding History

John Overdeck’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 		– Sell
-52,924
Closed -$41K – 5352
2026
Q1 		$41K Sell
52,924
-1,331,257
-96% -$1.38M ﹤0.01% 4466
2025
Q4 		$1.52M Buy
1,384,181
+868,329
+168% +$1.41M ﹤0.01% 2647
2025
Q3 		$727K Sell
515,852
-48,590
-9% -$70.2K ﹤0.01% 2788
2025
Q2 		$1.11M Sell
564,442
-252,533
-31% -$374K ﹤0.01% 2186
2025
Q1 		$980K Buy
816,975
+664,292
+435% +$1.27M ﹤0.01% 2190
2024
Q4 		$412K Buy
+152,683
New +$179K ﹤0.01% 2622
2024
Q3 		– Sell
-89,261
Closed -$93.7K – 3300
2024
Q2 		$93.7K Sell
89,261
-43,295
-33% -$69.4K ﹤0.01% 2831
2024
Q1 		$261K Buy
132,556
+56,665
+75% +$99K ﹤0.01% 2613
2023
Q4 		$153K Sell
75,891
-6,900
-8% -$10.5K ﹤0.01% 2890
2023
Q3 		$137K Buy
82,791
+45,700
+123% +$110K ﹤0.01% 2706
2023
Q2 		$66.4K Sell
37,091
-5,937
-14% -$9.3K ﹤0.01% 2798
2023
Q1 		$75.7K Sell
43,028
-3,172
-7% -$6.26K ﹤0.01% 2707
2022
Q4 		$84.5K Buy
+46,200
New +$119K ﹤0.01% 2531

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

John Overdeck's QSI Position: Q2 2026 in Review

John Overdeck sold out of Quantum-Si Incorporated (QSI) in Q2 2026, closing a stake of 52,924 shares — an estimated $41K sold.

John Overdeck first reported a position in QSI in Q4 2022 and held it in 13 quarters. The position peaked at $1.52M in Q4 2025. 140 funds tracked by Wall St. Rank hold QSI as of Q2 2026.

  • John Overdeck reported no remaining Quantum-Si Incorporated position as of Q2 2026 after selling out during the quarter.
  • John Overdeck sold 52,924 Quantum-Si Incorporated shares in Q2 2026, an estimated $41K.
  • John Overdeck first reported a position in Quantum-Si Incorporated in Q4 2022 and held it in 13 quarters.
  • John Overdeck's Quantum-Si Incorporated position peaked at $1.52M in Q4 2025.
  • 140 funds tracked by Wall St. Rank held Quantum-Si Incorporated as of Q2 2026.

Based on Two Sigma Investments's 13F filing for Q2 2026, filed 14 Aug 2026.