Group One Trading’s Quantum-Si Incorporated QSI Stock Holding History

Group One 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	$95.1K	Sell	107,473 -176,508	-62%	-$168K	﹤0.01%	4903
2026 Q1	$220K	Buy	283,981 +38,180	+16%	+$39.6K	﹤0.01%	4039
2025 Q4	$270K	Sell	245,801 -131,973	-35%	-$215K	﹤0.01%	4100
2025 Q3	$533K	Buy	377,774 +243,142	+181%	+$351K	﹤0.01%	3641
2025 Q2	$264K	Buy	+134,632	New	+$199K	﹤0.01%	4067
2023 Q3	–	Sell	-3,154	Closed	-$7.6K	–	8164
2023 Q2	$5.65K	Buy	3,154 +1,600	+103%	+$2.51K	﹤0.01%	6674
2023 Q1	$2.73K	Buy	+1,554	New	+$3.06K	﹤0.01%	6527
2021 Q3	–	Sell	-27,500	Closed	-$271K	–	8676
2021 Q2	$337K	Buy	27,500 +27,200	+9,067%	+$285K	﹤0.01%	4660
2021 Q1	$4K	Buy	+300	New	+$3.63K	﹤0.01%	7293

Other funds holding QSI

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 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 Minato-Ku, Tokyo, Japan $175B AUM 40.63% 1-Year Est. Return

Millennium Management New York $276B AUM 44.8% 1-Year Est. Return

UBS Group Zurich, Switzerland $786B AUM 40.34% 1-Year Est. Return

AQR Capital Management Greenwich, Connecticut $287B AUM 42.33% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Jane Street New York $1.21T AUM 78.12% 1-Year Est. Return

Group One Trading's QSI Position: Q2 2026 in Review

Group One Trading reduced its Quantum-Si Incorporated (QSI) stake by 62% in Q2 2026, selling an estimated $168K and leaving 107,473 shares worth $95.1K. The position accounts for ﹤0.01% of the portfolio, ranked #4903.

Group One Trading first reported a position in QSI in Q1 2021 and has held it in 9 quarters since. The position peaked at $533K in Q3 2025. 141 funds tracked by Wall St. Rank hold QSI as of Q2 2026.

Group One Trading held 107,473 shares of Quantum-Si Incorporated worth $95.1K as of Q2 2026.
Group One Trading sold 176,508 Quantum-Si Incorporated shares in Q2 2026, an estimated $168K.
Quantum-Si Incorporated made up ﹤0.01% of Group One Trading's portfolio in Q2 2026, its #4903 holding.
Group One Trading first reported a position in Quantum-Si Incorporated in Q1 2021 and has held it in 9 quarters since.
Group One Trading's Quantum-Si Incorporated position peaked at $533K in Q3 2025.
141 funds tracked by Wall St. Rank held Quantum-Si Incorporated as of Q2 2026.

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