Millennium Management’s Quantum-Si Incorporated QSI Stock Holding History

Millennium Management’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	$2.77M	Buy	+3,131,726	New	+$2.98M	﹤0.01%	3550
2026 Q1	–	Sell	-191,791	Closed	-$211K	–	6261
2025 Q4	$211K	Sell	191,791 -2,478,168	-93%	-$4.03M	﹤0.01%	5449
2025 Q3	$3.76M	Sell	2,669,959 -1,109,300	-29%	-$1.6M	﹤0.01%	3430
2025 Q2	$7.41M	Sell	3,779,259 -155,026	-4%	-$229K	﹤0.01%	2580
2025 Q1	$4.72M	Buy	+3,934,285	New	+$7.54M	﹤0.01%	2919
2024 Q4	–	Sell	-150,865	Closed	-$133K	–	6374
2024 Q3	$133K	Sell	150,865 -223,862	-60%	-$217K	﹤0.01%	5536
2024 Q2	$393K	Buy	374,727 +184,940	+97%	+$296K	﹤0.01%	4747
2024 Q1	$374K	Buy	+189,787	New	+$332K	﹤0.01%	4999
2023 Q2	–	Sell	-39,288	Closed	-$69K	–	6583
2023 Q1	$69K	Buy	39,288 +28,181	+254%	+$55.6K	﹤0.01%	5538
2022 Q4	$20K	Buy	+11,107	New	+$28.6K	﹤0.01%	6046
2022 Q2	–	Sell	-618,289	Closed	-$2.89M	–	7399
2022 Q1	$2.89M	Buy	+618,289	New	+$3.01M	﹤0.01%	3528
2021 Q4	–	Sell	-208,722	Closed	-$1.74M	–	7272
2021 Q3	$1.74M	Sell	208,722 -2,541,278	-92%	-$25M	﹤0.01%	4080
2021 Q2	$33.2M	Buy	2,750,000 +2,685,904	+4,190%	+$28.1M	0.02%	827
2021 Q1	$764K	Buy	+64,096	New	+$775K	﹤0.01%	4463

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

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

Susquehanna International Group Bala Cynwyd, Pennsylvania $1.28T AUM 58.89% 1-Year Est. Return

Millennium Management's QSI Position: Q2 2026 in Review

Millennium Management opened a new position in Quantum-Si Incorporated (QSI) in Q2 2026: 3,131,726 shares worth $2.77M. The stake represents ﹤0.01% of the portfolio and ranks #3550 among its holdings. This is a return to the name: Millennium Management previously reported a position in QSI as recently as Q4 2025.

Millennium Management first reported a position in QSI in Q1 2021 and has held it in 14 quarters since. The position peaked at $33.2M in Q2 2021. 141 funds tracked by Wall St. Rank hold QSI as of Q2 2026.

Millennium Management held 3,131,726 shares of Quantum-Si Incorporated worth $2.77M as of Q2 2026.
Quantum-Si Incorporated was a new Millennium Management position in Q2 2026.
Quantum-Si Incorporated made up ﹤0.01% of Millennium Management's portfolio in Q2 2026, its #3550 holding.
Millennium Management first reported a position in Quantum-Si Incorporated in Q1 2021 and has held it in 14 quarters since.
Millennium Management's Quantum-Si Incorporated position peaked at $33.2M in Q2 2021.
141 funds tracked by Wall St. Rank held Quantum-Si Incorporated as of Q2 2026.

Based on Millennium Management's 13F filing for Q2 2026, filed 14 Aug 2026.