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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 		$153K Sell
172,200
-51,500
-23% -$49K ﹤0.01% 12191
2026
Q1 		$172K Buy
223,700
+178,400
+394% +$185K ﹤0.01% 11848
2025
Q4 		$49.8K Sell
45,300
-11,900
-21% -$19.4K ﹤0.01% 11751
2025
Q3 		$80.7K Sell
57,200
-210,300
-79% -$304K ﹤0.01% 11678
2025
Q2 		$524K Buy
267,500
+167,800
+168% +$248K ﹤0.01% 9071
2025
Q1 		$120K Sell
99,700
-143,500
-59% -$275K ﹤0.01% 11413
2024
Q4 		$657K Buy
243,200
+201,800
+487% +$237K ﹤0.01% 7998
2024
Q3 		$36.4K Sell
41,400
-24,800
-37% -$24.1K ﹤0.01% 11491
2024
Q2 		$69.5K Sell
66,200
-29,700
-31% -$47.6K ﹤0.01% 11252
2024
Q1 		$189K Buy
95,900
+68,900
+255% +$120K ﹤0.01% 10654
2023
Q4 		$54.3K Sell
27,000
-14,400
-35% -$21.9K ﹤0.01% 11682
2023
Q3 		$68.7K Buy
+41,400
New +$99.7K ﹤0.01% 11144
2023
Q1 		– Sell
-17,600
Closed -$32.2K – 13313
2022
Q4 		$32.2K Sell
17,600
-60,900
-78% -$157K ﹤0.01% 11600
2022
Q3 		$216K Sell
78,500
-166,400
-68% -$532K ﹤0.01% 10646
2022
Q2 		$568K Sell
244,900
-3,500
-1% -$13.4K ﹤0.01% 7948
2022
Q1 		$1.16M Buy
248,400
+176,900
+247% +$862K ﹤0.01% 6745
2021
Q4 		$563K Sell
71,500
-14,100
-16% -$106K ﹤0.01% 8861
2021
Q3 		$714K Sell
85,600
-72,900
-46% -$718K ﹤0.01% 8454
2021
Q2 		$1.94M Buy
158,500
+40,700
+35% +$426K ﹤0.01% 5976
2021
Q1 		$1.4M Buy
+117,800
New +$1.42M ﹤0.01% 6828

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.