Jane Street
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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
Q2 		$219K Sell
247,300
-4,200
-2% -$4K ﹤0.01% 9925
2026
Q1 		$195K Sell
251,500
-27,100
-10% -$28.1K ﹤0.01% 10174
2025
Q4 		$306K Buy
278,600
+217,400
+355% +$354K ﹤0.01% 8798
2025
Q3 		$86.3K Buy
61,200
+18,200
+42% +$26.3K ﹤0.01% 10193
2025
Q2 		$84.3K Buy
43,000
+5,700
+15% +$8.43K ﹤0.01% 9023
2025
Q1 		$44.8K Sell
37,300
-62,100
-62% -$119K ﹤0.01% 9032
2024
Q4 		$268K Buy
+99,400
New +$116K ﹤0.01% 7920
2024
Q1 		– Sell
-204,800
Closed -$412K – 9916
2023
Q4 		$412K Sell
204,800
-20,400
-9% -$31.1K ﹤0.01% 7105
2023
Q3 		$374K Buy
+225,200
New +$542K ﹤0.01% 6709
2023
Q1 		– Sell
-17,500
Closed -$32K – 9748
2022
Q4 		$32K Sell
17,500
-25,700
-59% -$66.2K ﹤0.01% 8487
2022
Q3 		$119K Sell
43,200
-58,200
-57% -$186K ﹤0.01% 8553
2022
Q2 		$235K Sell
101,400
-85,700
-46% -$328K ﹤0.01% 7968
2022
Q1 		$876K Sell
187,100
-13,900
-7% -$67.7K ﹤0.01% 6398
2021
Q4 		$1.58M Buy
201,000
+41,100
+26% +$309K ﹤0.01% 4953
2021
Q3 		$1.33M Sell
159,900
-24,600
-13% -$242K ﹤0.01% 5320
2021
Q2 		$2.26M Buy
184,500
+171,400
+1,308% +$1.8M ﹤0.01% 4093
2021
Q1 		$156K Buy
+13,100
New +$158K ﹤0.01% 8443

Other funds holding QSI

Vanguard Capital Management
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
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
Sumitomo Mitsui Trust Group Minato-Ku, Tokyo, Japan $175B AUM 40.63% 1-Year Est. Return
Millennium Management
Millennium Management New York $276B AUM 44.8% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $786B AUM 40.34% 1-Year Est. Return
AQR Capital Management
AQR Capital Management Greenwich, Connecticut $287B AUM 42.33% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Susquehanna International Group
Susquehanna International Group Bala Cynwyd, Pennsylvania $1.28T AUM 58.89% 1-Year Est. Return

Jane Street's QSI Position: Q2 2026 in Review

Jane Street opened a new position in Quantum-Si Incorporated (QSI) in Q2 2026: 2,142,735 shares worth $1.9M. The stake represents ﹤0.01% of the portfolio and ranks #5262 among its holdings. This is a return to the name: Jane Street previously reported a position in QSI as recently as Q4 2025.

Jane Street first reported a position in QSI in Q1 2021 and has held it in 17 quarters since. The position peaked at $2.27M in Q3 2025. 141 funds tracked by Wall St. Rank hold QSI as of Q2 2026.

  • Jane Street held 2,142,735 shares of Quantum-Si Incorporated worth $1.9M as of Q2 2026.
  • Quantum-Si Incorporated was a new Jane Street position in Q2 2026.
  • Quantum-Si Incorporated made up ﹤0.01% of Jane Street's portfolio in Q2 2026, its #5262 holding.
  • Jane Street first reported a position in Quantum-Si Incorporated in Q1 2021 and has held it in 17 quarters since.
  • Jane Street's Quantum-Si Incorporated position peaked at $2.27M in Q3 2025.
  • 141 funds tracked by Wall St. Rank held Quantum-Si Incorporated as of Q2 2026.

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