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Jeff Yass’s Quantum-Si Incorporated QSI Stock Holding History

Jeff Yass’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 		$988K Sell
1,116,750
-347,818
-24% -$331K ﹤0.01% 8230
2026
Q1 		$1.13M Sell
1,464,568
-863,217
-37% -$894K ﹤0.01% 7556
2025
Q4 		$2.56M Buy
2,327,785
+286,690
+14% +$467K ﹤0.01% 5159
2025
Q3 		$2.88M Buy
2,041,095
+1,055,011
+107% +$1.53M ﹤0.01% 5055
2025
Q2 		$1.93M Buy
986,084
+189,154
+24% +$280K ﹤0.01% 5854
2025
Q1 		$956K Sell
796,930
-205,943
-21% -$395K ﹤0.01% 7367
2024
Q4 		$2.71M Buy
1,002,873
+958,844
+2,178% +$1.12M ﹤0.01% 4667
2024
Q3 		$38.8K Sell
44,029
-91,059
-67% -$88.4K ﹤0.01% 11470
2024
Q2 		$142K Buy
135,088
+109,662
+431% +$176K ﹤0.01% 10752
2024
Q1 		$50.1K Sell
25,426
-81,019
-76% -$142K ﹤0.01% 11561
2023
Q4 		$214K Sell
106,445
-13,851
-12% -$21.1K ﹤0.01% 10545
2023
Q3 		$200K Buy
120,296
+27,114
+29% +$65.3K ﹤0.01% 10232
2023
Q2 		$167K Sell
93,182
-5,867
-6% -$9.19K ﹤0.01% 10460
2023
Q1 		$174K Sell
99,049
-19,780
-17% -$39K ﹤0.01% 10763
2022
Q4 		$217K Buy
118,829
+38,068
+47% +$98.1K ﹤0.01% 9920
2022
Q3 		$222K Sell
80,761
-210,001
-72% -$671K ﹤0.01% 10571
2022
Q2 		$675K Sell
290,762
-160,088
-36% -$613K ﹤0.01% 7522
2022
Q1 		$2.11M Buy
450,850
+340,252
+308% +$1.66M ﹤0.01% 5360
2021
Q4 		$870K Sell
110,598
-48,470
-30% -$365K ﹤0.01% 7654
2021
Q3 		$1.33M Buy
159,068
+23,565
+17% +$232K ﹤0.01% 6815
2021
Q2 		$1.66M Buy
135,503
+77,241
+133% +$809K ﹤0.01% 6358
2021
Q1 		$694K Buy
+58,262
New +$704K ﹤0.01% 8677

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

Jeff Yass's QSI Position: Q2 2026 in Review

Jeff Yass reduced its Quantum-Si Incorporated (QSI) stake by 24% in Q2 2026, selling an estimated $331K and leaving 1,116,750 shares worth $988K. The position accounts for ﹤0.01% of the portfolio, ranked #8230.

Jeff Yass first reported a position in QSI in Q1 2021 and has held it in 22 quarters since. The position peaked at $2.88M in Q3 2025. 140 funds tracked by Wall St. Rank hold QSI as of Q2 2026.

  • Jeff Yass held 1,116,750 shares of Quantum-Si Incorporated worth $988K as of Q2 2026.
  • Jeff Yass sold 347,818 Quantum-Si Incorporated shares in Q2 2026, an estimated $331K.
  • Quantum-Si Incorporated made up ﹤0.01% of Jeff Yass's portfolio in Q2 2026, its #8230 holding.
  • Jeff Yass first reported a position in Quantum-Si Incorporated in Q1 2021 and has held it in 22 quarters since.
  • Jeff Yass's Quantum-Si Incorporated position peaked at $2.88M in Q3 2025.
  • 140 funds tracked by Wall St. Rank held Quantum-Si Incorporated as of Q2 2026.

Based on Susquehanna International Group's 13F filing for Q2 2026, filed 14 Aug 2026.