Vanguard Group’s Quantum-Si Incorporated QSI Stock Holding History

Vanguard Group’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
2025 Q4	$10.6M	Buy	9,607,022 +892,515	+10%	+$1.45M	﹤0.01%	2937
2025 Q3	$12.3M	Buy	8,714,507 +44,846	+0.5%	+$64.8K	﹤0.01%	2863
2025 Q2	$17M	Buy	8,669,661 +1,776,799	+26%	+$2.63M	﹤0.01%	2629
2025 Q1	$8.27M	Buy	6,892,862 +1,401,109	+26%	+$2.68M	﹤0.01%	2952
2024 Q4	$14.8M	Buy	5,491,753 +454,495	+9%	+$533K	﹤0.01%	2745
2024 Q3	$4.44M	Buy	5,037,258 +88,896	+2%	+$86.3K	﹤0.01%	3307
2024 Q2	$5.2M	Sell	4,948,362 -352,323	-7%	-$565K	﹤0.01%	3245
2024 Q1	$10.4M	Buy	5,300,685 +82,463	+2%	+$144K	﹤0.01%	2943
2023 Q4	$10.5M	Buy	5,218,222 +53,026	+1%	+$80.8K	﹤0.01%	2920
2023 Q3	$8.57M	Buy	5,165,196 +10,192	+0.2%	+$24.5K	﹤0.01%	2968
2023 Q2	$9.23M	Buy	5,155,004 +31,446	+0.6%	+$49.3K	﹤0.01%	2990
2023 Q1	$9.02M	Buy	5,123,558 +176,380	+4%	+$348K	﹤0.01%	2990
2022 Q4	$9.05M	Buy	4,947,178 +26,256	+0.5%	+$67.6K	﹤0.01%	2996
2022 Q3	$13.5M	Buy	4,920,922 +308,343	+7%	+$986K	﹤0.01%	2808
2022 Q2	$10.7M	Buy	4,612,579 +678,572	+17%	+$2.6M	﹤0.01%	2955
2022 Q1	$18.4M	Buy	3,934,007 +2,134,692	+119%	+$10.4M	﹤0.01%	2822
2021 Q4	$14.2M	Buy	1,799,315 +265,712	+17%	+$2M	﹤0.01%	3033
2021 Q3	$12.8M	Buy	+1,533,603	New	+$15.1M	﹤0.01%	3102

Other funds holding QSI

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

AIM

ARK Investment Management St. Petersburg, Florida $12.9B AUM 64.92% 1-Year Est. Return

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

NAMA

Nikko Asset Management Americas New York $7.07B AUM 50.91% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

Citadel Advisors Miami, Florida $618B AUM 30.34% 1-Year Est. Return

Susquehanna International Group Bala Cynwyd, Pennsylvania $893B AUM 36.07% 1-Year Est. Return

Northern Trust Chicago, Illinois $757B AUM 28.64% 1-Year Est. Return

UBS Group Zurich, Switzerland $666B AUM 30.12% 1-Year Est. Return

Vanguard Group's QSI Position: Q4 2025 in Review

Vanguard Group increased its Quantum-Si Incorporated (QSI) stake by 10% in Q4 2025, buying an estimated $1.45M and bringing the position to 9,607,022 shares worth $10.6M. The position accounts for ﹤0.01% of the portfolio, ranked #2937.

Vanguard Group first reported a position in QSI in Q3 2021 and has held it in 18 quarters since. The position peaked at $18.4M in Q1 2022. 135 funds tracked by Wall St. Rank hold QSI as of Q4 2025.

Vanguard Group held 9,607,022 shares of Quantum-Si Incorporated worth $10.6M as of Q4 2025.
Vanguard Group bought 892,515 Quantum-Si Incorporated shares in Q4 2025, an estimated $1.45M.
Quantum-Si Incorporated made up ﹤0.01% of Vanguard Group's portfolio in Q4 2025, its #2937 holding.
Vanguard Group first reported a position in Quantum-Si Incorporated in Q3 2021 and has held it in 18 quarters since.
Vanguard Group's Quantum-Si Incorporated position peaked at $18.4M in Q1 2022.
135 funds tracked by Wall St. Rank held Quantum-Si Incorporated as of Q4 2025.

Based on Vanguard Group's 13F filing for Q4 2025, filed 29 Jan 2026.