Jefferies Financial Group’s Quantum-Si Incorporated QSI Stock Holding History

Jefferies Financial 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
2026 Q2	$10K	Buy	+11,350	New	+$10.8K	﹤0.01%	1615
2025 Q3	–	Sell	-20,000	Closed	-$39.2K	–	1635
2025 Q2	$39.2K	Sell	20,000 -63,031	-76%	-$93.2K	﹤0.01%	1206
2025 Q1	$99.6K	Buy	+83,031	New	+$159K	﹤0.01%	1467
2024 Q4	–	Sell	-10,941	Closed	-$9.65K	–	1800
2024 Q3	$9.65K	Buy	+10,941	New	+$10.6K	﹤0.01%	1387

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

Jefferies Financial Group's QSI Position: Q2 2026 in Review

Jefferies Financial Group opened a new position in Quantum-Si Incorporated (QSI) in Q2 2026: 11,350 shares worth $10K. The stake represents ﹤0.01% of the portfolio and ranks #1615 among its holdings. This is a return to the name: Jefferies Financial Group previously reported a position in QSI as recently as Q2 2025.

Jefferies Financial Group first reported a position in QSI in Q3 2024 and has held it in 4 quarters since. The position peaked at $99.6K in Q1 2025. 141 funds tracked by Wall St. Rank hold QSI as of Q2 2026.

Jefferies Financial Group held 11,350 shares of Quantum-Si Incorporated worth $10K as of Q2 2026.
Quantum-Si Incorporated was a new Jefferies Financial Group position in Q2 2026.
Quantum-Si Incorporated made up ﹤0.01% of Jefferies Financial Group's portfolio in Q2 2026, its #1615 holding.
Jefferies Financial Group first reported a position in Quantum-Si Incorporated in Q3 2024 and has held it in 4 quarters since.
Jefferies Financial Group's Quantum-Si Incorporated position peaked at $99.6K in Q1 2025.
141 funds tracked by Wall St. Rank held Quantum-Si Incorporated as of Q2 2026.

Based on Jefferies Financial Group's 13F filing for Q2 2026, filed 17 Aug 2026.