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ARK Investment Management’s Quantum-Si Incorporated QSI Stock Holding History

ARK Investment Management’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 		$6.34M Buy
7,167,738
+288,839
+4% +$275K 0.04% 108
2026
Q1 		$5.32M Sell
6,878,899
-142,672
-2% -$148K 0.04% 106
2025
Q4 		$7.72M Sell
7,021,571
-602,471
-8% -$981K 0.05% 116
2025
Q3 		$10.7M Sell
7,624,042
-336,694
-4% -$487K 0.06% 111
2025
Q2 		$15.6M Sell
7,960,736
-752,765
-9% -$1.11M 0.11% 84
2025
Q1 		$10.5M Sell
8,713,501
-135,149
-2% -$259K 0.1% 90
2024
Q4 		$23.9M Sell
8,848,650
-2,993,959
-25% -$3.51M 0.2% 63
2024
Q3 		$10.4M Sell
11,842,609
-567,320
-5% -$551K 0.1% 93
2024
Q2 		$13M Sell
12,409,929
-358,947
-3% -$575K 0.12% 87
2024
Q1 		$25.2M Sell
12,768,876
-2,750,446
-18% -$4.81M 0.17% 68
2023
Q4 		$31.2M Buy
15,519,322
+1,071,105
+7% +$1.63M 0.18% 64
2023
Q3 		$24M Buy
14,448,217
+1,693,686
+13% +$4.08M 0.18% 67
2023
Q2 		$22.8M Buy
12,754,531
+1,055,740
+9% +$1.65M 0.15% 79
2023
Q1 		$20.6M Sell
11,698,791
-157,393
-1% -$310K 0.14% 71
2022
Q4 		$21.7M Sell
11,856,184
-1,381,606
-10% -$3.56M 0.19% 69
2022
Q3 		$36.4M Sell
13,237,790
-631,294
-5% -$2.02M 0.25% 54
2022
Q2 		$58.9M Buy
13,869,084
+495,527
+4% +$1.9M 0.35% 50
2022
Q1 		$62.6M Buy
13,373,557
+306,407
+2% +$1.49M 0.26% 60
2021
Q4 		$103M Buy
13,067,150
+368,769
+3% +$2.78M 0.31% 56
2021
Q3 		$106M Buy
12,698,381
+8,650,078
+214% +$85.2M 0.25% 68
2021
Q2 		$49.6M Buy
+4,048,303
New +$42.4M 0.09% 124

Other funds holding QSI

Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
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
Jane Street
Jane Street New York $1.21T AUM 78.12% 1-Year Est. Return
Susquehanna International Group
Susquehanna International Group Bala Cynwyd, Pennsylvania $1.28T AUM 58.89% 1-Year Est. Return

ARK Investment Management's QSI Position: Q2 2026 in Review

ARK Investment Management increased its Quantum-Si Incorporated (QSI) stake by 4.2% in Q2 2026, buying an estimated $275K and bringing the position to 7,167,738 shares worth $6.34M. The position accounts for 0.04% of the portfolio, ranked #108.

ARK Investment Management first reported a position in QSI in Q2 2021 and has held it in 21 quarters since. The position peaked at $106M in Q3 2021. 141 funds tracked by Wall St. Rank hold QSI as of Q2 2026.

  • ARK Investment Management held 7,167,738 shares of Quantum-Si Incorporated worth $6.34M as of Q2 2026.
  • ARK Investment Management bought 288,839 Quantum-Si Incorporated shares in Q2 2026, an estimated $275K.
  • Quantum-Si Incorporated made up 0.04% of ARK Investment Management's portfolio in Q2 2026, its #108 holding.
  • ARK Investment Management first reported a position in Quantum-Si Incorporated in Q2 2021 and has held it in 21 quarters since.
  • ARK Investment Management's Quantum-Si Incorporated position peaked at $106M in Q3 2021.
  • 141 funds tracked by Wall St. Rank held Quantum-Si Incorporated as of Q2 2026.

Based on ARK Investment Management's 13F filing for Q2 2026, filed 14 Aug 2026.