Renaissance Technologies’s Quantum-Si Incorporated QSI Stock Holding History

Renaissance Technologies’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	$490K	Buy	553,871 +435,971	+370%	+$415K	﹤0.01%	2613
2026 Q1	$91.3K	Buy	+117,900	New	+$122K	﹤0.01%	3043
2025 Q3	–	Sell	-89,200	Closed	-$175K	–	3828
2025 Q2	$175K	Sell	89,200 -782,556	-90%	-$1.16M	﹤0.01%	3197
2025 Q1	$1.05M	Buy	871,756 +326,800	+60%	+$626K	﹤0.01%	2396
2024 Q4	$1.47M	Buy	544,956 +503,400	+1,211%	+$590K	﹤0.01%	2257
2024 Q3	$36.7K	Buy	+41,556	New	+$40.3K	﹤0.01%	3380
2023 Q3	–	Sell	-223,256	Closed	-$400K	–	4019
2023 Q2	$400K	Buy	223,256 +110,400	+98%	+$173K	﹤0.01%	2989
2023 Q1	$199K	Buy	112,856 +75,300	+201%	+$149K	﹤0.01%	3287
2022 Q4	$69K	Buy	+37,556	New	+$96.8K	﹤0.01%	3724

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

Renaissance Technologies's QSI Position: Q2 2026 in Review

Renaissance Technologies increased its Quantum-Si Incorporated (QSI) stake by 370% in Q2 2026, buying an estimated $415K and bringing the position to 553,871 shares worth $490K. The position accounts for ﹤0.01% of the portfolio, ranked #2613.

Renaissance Technologies first reported a position in QSI in Q4 2022 and has held it in 9 quarters since. The position peaked at $1.47M in Q4 2024. 141 funds tracked by Wall St. Rank hold QSI as of Q2 2026.

Renaissance Technologies held 553,871 shares of Quantum-Si Incorporated worth $490K as of Q2 2026.
Renaissance Technologies bought 435,971 Quantum-Si Incorporated shares in Q2 2026, an estimated $415K.
Quantum-Si Incorporated made up ﹤0.01% of Renaissance Technologies's portfolio in Q2 2026, its #2613 holding.
Renaissance Technologies first reported a position in Quantum-Si Incorporated in Q4 2022 and has held it in 9 quarters since.
Renaissance Technologies's Quantum-Si Incorporated position peaked at $1.47M in Q4 2024.
141 funds tracked by Wall St. Rank held Quantum-Si Incorporated as of Q2 2026.

Based on Renaissance Technologies's 13F filing for Q2 2026, filed 13 Aug 2026.