AllianceBernstein’s Quantum-Si Incorporated QSI Stock Holding History

AllianceBernstein’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	–	Sell	-272,180	Closed	-$299K	–	3414
2026 Q1	$299K	Hold	272,180	–	–	﹤0.01%	2882
2025 Q4	$299K	Hold	272,180	–	–	﹤0.01%	2907
2025 Q3	$384K	Hold	272,180	–	–	﹤0.01%	2824
2025 Q2	$533K	Buy	272,180 +162,000	+147%	+$240K	﹤0.01%	2608
2025 Q1	$132K	Buy	110,180 +34,100	+45%	+$65.3K	﹤0.01%	3020
2024 Q4	$205K	Hold	76,080	–	–	﹤0.01%	3019
2024 Q3	$67.1K	Hold	76,080	–	–	﹤0.01%	3167
2024 Q2	$79.9K	Buy	76,080 +20,880	+38%	+$33.5K	﹤0.01%	3144
2024 Q1	$109K	Hold	55,200	–	–	﹤0.01%	3020
2023 Q4	$111K	Hold	55,200	–	–	﹤0.01%	3058
2023 Q3	$91.6K	Buy	55,200 +9,460	+21%	+$22.8K	﹤0.01%	3080
2023 Q2	$81.9K	Buy	45,740 +14,240	+45%	+$22.3K	﹤0.01%	3093
2023 Q1	$55.4K	Hold	31,500	–	–	﹤0.01%	3086
2022 Q4	$57.6K	Buy	31,500 +11,800	+60%	+$30.4K	﹤0.01%	3164
2022 Q3	$54K	Buy	19,700 +9,200	+88%	+$29.4K	﹤0.01%	3176
2022 Q2	$24K	Buy	+10,500	New	+$40.2K	﹤0.01%	3198

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

AllianceBernstein's QSI Position: Q2 2026 in Review

AllianceBernstein sold out of Quantum-Si Incorporated (QSI) in Q2 2026, closing a stake of 272,180 shares — an estimated $299K sold.

AllianceBernstein first reported a position in QSI in Q2 2022 and held it in 16 quarters. The position peaked at $533K in Q2 2025. 141 funds tracked by Wall St. Rank hold QSI as of Q2 2026.

AllianceBernstein reported no remaining Quantum-Si Incorporated position as of Q2 2026 after selling out during the quarter.
AllianceBernstein sold 272,180 Quantum-Si Incorporated shares in Q2 2026, an estimated $299K.
AllianceBernstein first reported a position in Quantum-Si Incorporated in Q2 2022 and held it in 16 quarters.
AllianceBernstein's Quantum-Si Incorporated position peaked at $533K in Q2 2025.
141 funds tracked by Wall St. Rank held Quantum-Si Incorporated as of Q2 2026.

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