Shay Capital’s Quantum-Si Incorporated QSI Stock Holding History

Shay Capital’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	$134K	Hold	150,922	–	–	0.01%	432
2026 Q1	$117K	Buy	150,922 +1,790	+1%	+$1.85K	0.01%	430
2025 Q4	$164K	Sell	149,132 -5,440	-4%	-$8.86K	0.02%	422
2025 Q3	$218K	Buy	154,572 +24,941	+19%	+$36.1K	0.02%	346
2025 Q2	$254K	Buy	129,631 +1,131	+0.9%	+$1.67K	0.03%	236
2025 Q1	$154K	Sell	128,500 -88,046	-41%	-$169K	0.02%	254
2024 Q4	$585K	Buy	216,546 +78,376	+57%	+$91.9K	0.09%	163
2024 Q3	$122K	Sell	138,170 -90	-0.1%	-$87	0.02%	271
2024 Q2	$145K	Buy	138,260 +112,598	+439%	+$181K	0.02%	228
2024 Q1	$50.6K	Sell	25,662 -3,676	-13%	-$6.42K	0.01%	352
2023 Q4	$59K	Buy	29,338 +9,801	+50%	+$14.9K	0.01%	248
2023 Q3	$32.4K	Sell	19,537 -64,161	-77%	-$155K	﹤0.01%	322
2023 Q2	$150K	Buy	+83,698	New	+$131K	0.02%	306
2022 Q3	–	Sell	-65,879	Closed	-$153K	–	469
2022 Q2	$153K	Buy	+65,879	New	+$252K	0.03%	323

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

Shay Capital's QSI Position: Q2 2026 in Review

Shay Capital held its Quantum-Si Incorporated (QSI) position steady in Q2 2026 at 150,922 shares worth $134K. The position accounts for 0.01% of the portfolio, ranked #432.

Shay Capital first reported a position in QSI in Q2 2022 and has held it in 14 quarters since. The position peaked at $585K in Q4 2024. 141 funds tracked by Wall St. Rank hold QSI as of Q2 2026.

Shay Capital held 150,922 shares of Quantum-Si Incorporated worth $134K as of Q2 2026.
Shay Capital left its Quantum-Si Incorporated share count unchanged in Q2 2026.
Quantum-Si Incorporated made up 0.01% of Shay Capital's portfolio in Q2 2026, its #432 holding.
Shay Capital first reported a position in Quantum-Si Incorporated in Q2 2022 and has held it in 14 quarters since.
Shay Capital's Quantum-Si Incorporated position peaked at $585K in Q4 2024.
141 funds tracked by Wall St. Rank held Quantum-Si Incorporated as of Q2 2026.

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