Harbour Investments’s Quantum-Si Incorporated QSI Stock Holding History

Harbour Investments’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	$265	Buy	299 +49	+20%	+$47	﹤0.01%	4502
2026 Q1	$194	Buy	+250	New	+$259	﹤0.01%	4440
2023 Q4	–	Sell	-20	Closed	-$33	–	3179
2023 Q3	$33	Buy	+20	New	+$48	﹤0.01%	2957
2021 Q3	–	Sell	-100	Closed	-$1K	–	3928
2021 Q2	$1K	Hold	100	–	–	﹤0.01%	3630
2021 Q1	$1K	Buy	+100	New	+$1.21K	﹤0.01%	3464

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

Harbour Investments's QSI Position: Q2 2026 in Review

Harbour Investments increased its Quantum-Si Incorporated (QSI) stake by 20% in Q2 2026, buying an estimated $47 and bringing the position to 299 shares worth $265. The position accounts for ﹤0.01% of the portfolio, ranked #4502.

Harbour Investments first reported a position in QSI in Q1 2021 and has held it in 5 quarters since. The position peaked at $1K in Q2 2021. 141 funds tracked by Wall St. Rank hold QSI as of Q2 2026.

Harbour Investments held 299 shares of Quantum-Si Incorporated worth $265 as of Q2 2026.
Harbour Investments bought 49 Quantum-Si Incorporated shares in Q2 2026, an estimated $47.
Quantum-Si Incorporated made up ﹤0.01% of Harbour Investments's portfolio in Q2 2026, its #4502 holding.
Harbour Investments first reported a position in Quantum-Si Incorporated in Q1 2021 and has held it in 5 quarters since.
Harbour Investments's Quantum-Si Incorporated position peaked at $1K in Q2 2021.
141 funds tracked by Wall St. Rank held Quantum-Si Incorporated as of Q2 2026.

Based on Harbour Investments's 13F filing for Q2 2026, filed 12 Aug 2026.