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BlackRock’s Quantum-Si Incorporated QSI Stock Holding History

BlackRock’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 		$4.62M Sell
5,225,352
-8,189,597
-61% -$7.8M ﹤0.01% 3951
2026
Q1 		$10.4M Buy
13,414,949
+360,892
+3% +$374K ﹤0.01% 3489
2025
Q4 		$14.4M Buy
13,054,057
+1,732,384
+15% +$2.82M ﹤0.01% 3278
2025
Q3 		$16M Buy
11,321,673
+473,531
+4% +$684K ﹤0.01% 3223
2025
Q2 		$21.3M Buy
10,848,142
+1,407,899
+15% +$2.08M ﹤0.01% 2987
2025
Q1 		$11.3M Buy
9,440,243
+1,002,596
+12% +$1.92M ﹤0.01% 3254
2024
Q4 		$22.8M Buy
8,437,647
+1,537,520
+22% +$1.8M ﹤0.01% 2964
2024
Q3 		$6.09M Sell
6,900,127
-100,757
-1% -$97.8K ﹤0.01% 3625
2024
Q2 		$7.35M Sell
7,000,884
-231,111
-3% -$371K ﹤0.01% 3539
2024
Q1 		$14.2M Sell
7,231,995
-151,576
-2% -$265K ﹤0.01% 3171
2023
Q4 		$14.8M Buy
7,383,571
+370,542
+5% +$565K ﹤0.01% 3182
2023
Q3 		$11.6M Sell
7,013,029
-88,949
-1% -$214K ﹤0.01% 3246
2023
Q2 		$12.7M Buy
7,101,978
+1,018,153
+17% +$1.6M ﹤0.01% 3299
2023
Q1 		$10.7M Sell
6,083,825
-377,684
-6% -$745K ﹤0.01% 3282
2022
Q4 		$11.8M Buy
6,461,509
+106,769
+2% +$275K ﹤0.01% 3317
2022
Q3 		$17.5M Buy
6,354,740
+134,546
+2% +$430K ﹤0.01% 3108
2022
Q2 		$14.4M Buy
6,220,194
+4,657,699
+298% +$17.8M ﹤0.01% 3286
2022
Q1 		$7.31M Buy
1,562,495
+29,793
+2% +$145K ﹤0.01% 3753
2021
Q4 		$12.1M Buy
1,532,702
+378,586
+33% +$2.85M ﹤0.01% 3559
2021
Q3 		$9.63M Buy
+1,154,116
New +$11.4M ﹤0.01% 3693

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
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

BlackRock's QSI Position: Q2 2026 in Review

BlackRock reduced its Quantum-Si Incorporated (QSI) stake by 61% in Q2 2026, selling an estimated $7.8M and leaving 5,225,352 shares worth $4.62M. The position accounts for ﹤0.01% of the portfolio, ranked #3951.

BlackRock first reported a position in QSI in Q3 2021 and has held it in 20 quarters since. The position peaked at $22.8M in Q4 2024. 141 funds tracked by Wall St. Rank hold QSI as of Q2 2026.

  • BlackRock held 5,225,352 shares of Quantum-Si Incorporated worth $4.62M as of Q2 2026.
  • BlackRock sold 8,189,597 Quantum-Si Incorporated shares in Q2 2026, an estimated $7.8M.
  • Quantum-Si Incorporated made up ﹤0.01% of BlackRock's portfolio in Q2 2026, its #3951 holding.
  • BlackRock first reported a position in Quantum-Si Incorporated in Q3 2021 and has held it in 20 quarters since.
  • BlackRock's Quantum-Si Incorporated position peaked at $22.8M in Q4 2024.
  • 141 funds tracked by Wall St. Rank held Quantum-Si Incorporated as of Q2 2026.

Based on BlackRock's 13F filing for Q2 2026, filed 7 Aug 2026.