Jane Street’s Quantum-Si Incorporated QSI Stock Holding History

Jane Street’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 Q1	$24.1K	Sell	31,100 -21,100	-40%	-$21.9K	﹤0.01%	11160
2025 Q4	$57.4K	Buy	52,200 +37,200	+248%	+$60.5K	﹤0.01%	10462
2025 Q3	$21.1K	Sell	15,000 -8,800	-37%	-$12.7K	﹤0.01%	10524
2025 Q2	$46.6K	Sell	23,800 -13,600	-36%	-$20.1K	﹤0.01%	9194
2025 Q1	$44.9K	Sell	37,400 -7,400	-17%	-$14.2K	﹤0.01%	9030
2024 Q4	$121K	Buy	+44,800	New	+$52.5K	﹤0.01%	8678
2022 Q3	–	Sell	-46,700	Closed	-$108K	–	10307
2022 Q2	$108K	Buy	46,700 +24,400	+109%	+$93.4K	﹤0.01%	8591
2022 Q1	$104K	Sell	22,300 -3,900	-15%	-$19K	﹤0.01%	9436
2021 Q4	$206K	Sell	26,200 -5,700	-18%	-$42.9K	﹤0.01%	8779
2021 Q3	$266K	Buy	31,900 +21,400	+204%	+$211K	﹤0.01%	8415
2021 Q2	$129K	Buy	+10,500	New	+$110K	﹤0.01%	9142

Other funds holding QSI

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

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

AIM

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

NAMA

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

Sumitomo Mitsui Trust Group Minato-Ku, Tokyo, Japan $154B AUM 29.96% 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

AQR Capital Management Greenwich, Connecticut $218B AUM 29.41% 1-Year Est. Return

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

VPM

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

Jane Street's QSI Position: Q1 2026 in Review

Jane Street sold out of Quantum-Si Incorporated (QSI) in Q1 2026, closing a stake of 1,104,033 shares — an estimated $1.14M sold.

Jane Street first reported a position in QSI in Q1 2021 and held it in 16 quarters. The position peaked at $2.27M in Q3 2025. 156 funds tracked by Wall St. Rank hold QSI as of Q1 2026.

Jane Street reported no remaining Quantum-Si Incorporated position as of Q1 2026 after selling out during the quarter.
Jane Street sold 1,104,033 Quantum-Si Incorporated shares in Q1 2026, an estimated $1.14M.
Jane Street first reported a position in Quantum-Si Incorporated in Q1 2021 and held it in 16 quarters.
Jane Street's Quantum-Si Incorporated position peaked at $2.27M in Q3 2025.
156 funds tracked by Wall St. Rank held Quantum-Si Incorporated as of Q1 2026.

Based on Jane Street's 13F filing for Q1 2026, filed 12 May 2026.