Atom Investors’s Quantum-Si Incorporated QSI Stock Holding History

Atom Investors’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	$45.6K	Buy	+51,554	New	+$49.1K	﹤0.01%	812
2026 Q1	–	Sell	-21,995	Closed	-$24.2K	–	807
2025 Q4	$24.2K	Buy	+21,995	New	+$35.8K	﹤0.01%	554
2025 Q3	–	Sell	-20,803	Closed	-$40.8K	–	774
2025 Q2	$40.8K	Sell	20,803 -9,369	-31%	-$13.9K	﹤0.01%	578
2025 Q1	$36.2K	Buy	+30,172	New	+$57.8K	﹤0.01%	480

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

Atom Investors's QSI Position: Q2 2026 in Review

Atom Investors opened a new position in Quantum-Si Incorporated (QSI) in Q2 2026: 51,554 shares worth $45.6K. The stake represents ﹤0.01% of the portfolio and ranks #812 among its holdings. This is a return to the name: Atom Investors previously reported a position in QSI as recently as Q4 2025.

Atom Investors first reported a position in QSI in Q1 2025 and has held it in 4 quarters since. 141 funds tracked by Wall St. Rank hold QSI as of Q2 2026.

Atom Investors held 51,554 shares of Quantum-Si Incorporated worth $45.6K as of Q2 2026.
Quantum-Si Incorporated was a new Atom Investors position in Q2 2026.
Quantum-Si Incorporated made up ﹤0.01% of Atom Investors's portfolio in Q2 2026, its #812 holding.
Atom Investors first reported a position in Quantum-Si Incorporated in Q1 2025 and has held it in 4 quarters since.
141 funds tracked by Wall St. Rank held Quantum-Si Incorporated as of Q2 2026.

Based on Atom Investors's 13F filing for Q2 2026, filed 14 Aug 2026.