Quantum-Si Inc - Common Stock (QSI) Institutional Ownership

13F Institutional Holders and Ownership History from Q2 2021 to Q4 2025

Type / Class
Equity / Common Stock
Symbol
QSI on Nasdaq
Shares outstanding
182,694,067
Price per share
$1.10
All holders as of 30 Sep 2025
Q3 2025
Total 13F shares
64,419,810
Total reported value
$90,839,245
% of total 13F portfolios
0%
Share change
+68,696
Value change
-$423,148
Number of holders
119
Price from insider filings
$1.10
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Significant Owners of Quantum-Si Inc - Common Stock (QSI) based on Schedule 13D/G filings

Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
ROTHBERG JONATHAN M 100% 0% $30,105,625 19,937,500 0% ROTHBERG JONATHAN M. 09 Sep 2025
VANGUARD GROUP INC 4.8% -11% $12,287,455 +$63,233 8,714,507 +0.52% The Vanguard Group 30 Sep 2025
ARK Investment Management LLC 4.8% -11% $11,792,099 -$1,365,288 7,809,337 -10% ARK Investment Management LLC 31 May 2025
Sumitomo Mitsui Trust Group, Inc. 4.8% $7,456,510 5,965,208 Sumitomo Mitsui Trust Group, Inc. 31 Dec 2024
Nikko Asset Management Americas, Inc. 4.8% $7,456,510 5,965,208 Nikko Asset Management Americas, Inc. 31 Dec 2024

As of 30 Sep 2025, 119 institutional investors reported holding 64,419,810 shares of Quantum-Si Inc - Common Stock (QSI). This represents 35% of the company’s total 182,694,067 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of Quantum-Si Inc - Common Stock (QSI) together control 33% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.

Institution Ownership % Shares Held Share Change % Portfolio % Holdings Value
BlackRock, Inc. 6.2% 11,321,673 +4.4% 0% $15,963,559
VANGUARD GROUP INC 4.8% 8,714,507 +0.52% 0% $12,287,455
ARK Investment Management LLC 4.2% 7,624,042 -4.2% 0.06% $10,749,899
Amova Asset Management Americas, Inc. 2.9% 5,217,499 -7.2% 0.07% $7,356,674
Sumitomo Mitsui Trust Group, Inc. 2.9% 5,217,499 -7.2% 0% $7,356,674
GEODE CAPITAL MANAGEMENT, LLC 2.1% 3,747,169 +8.7% 0% $5,284,591
STATE STREET CORP 1.5% 2,817,490 +2.2% 0% $3,972,661
MILLENNIUM MANAGEMENT LLC 1.5% 2,669,959 -29% 0% $3,764,642
NORTHERN TRUST CORP 1.3% 2,323,042 +1.5% 0% $3,275,489
SUSQUEHANNA INTERNATIONAL GROUP, LLP 1.1% 2,041,095 +107% 0% $2,877,944
JANE STREET GROUP, LLC 0.88% 1,610,023 +465% 0% $2,270,133
Fosun International Ltd 0.41% 743,935 0% 0.39% $1,048,948
Squarepoint Ops LLC 0.34% 613,475 0% $865,000
ROYAL BANK OF CANADA 0.29% 532,293 +16% 0% $750,000
TWO SIGMA INVESTMENTS, LP 0.28% 515,852 -8.6% 0% $727,351
UBS Group AG 0.28% 504,859 -36% 0% $711,851
CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.26% 468,088 +8.5% 0% $660,004
Nuveen, LLC 0.24% 447,519 -60% 0% $631,002
CITADEL ADVISORS LLC 0.22% 407,047 -27% 0% $573,936
Bank of New York Mellon Corp 0.22% 394,905 +12% 0% $556,815
GOLDMAN SACHS GROUP INC 0.21% 387,151 -57% 0% $545,883
GROUP ONE TRADING LLC 0.21% 377,774 +181% 0.02% $532,661
BANK OF AMERICA CORP /DE/ 0.19% 348,007 -25% 0% $490,691
Knollwood Investment Advisory, LLC 0.16% 300,000 0% 0.04% $423,000
Invesco Ltd. 0.16% 295,728 +51% 0% $416,976

Institutional Holders of Quantum-Si Inc - Common Stock (QSI) across Reporting Periods

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2025 Q4 110,904 $121,578 -$206,469 $1.10 7
2025 Q3 64,419,810 $90,839,245 -$423,148 $1.41 119
2025 Q2 64,302,080 $126,030,953 +$13,332,085 $1.96 131
2025 Q1 57,702,101 $69,187,667 +$4,278,857 $1.20 132
2024 Q4 53,622,263 $144,753,245 +$7,421,471 $2.70 118
2024 Q3 51,983,353 $45,842,462 -$1,301,448 $0.88 105
2024 Q2 53,496,446 $56,012,611 +$296,100 $1.05 96
2024 Q1 52,901,559 $104,054,161 -$7,048,293 $1.97 93
2023 Q4 44,607 $89,660 -$13,047 $2.01 1
2023 Q3 54,499,792 $90,470,482 +$17,087,321 $1.66 91
2023 Q2 43,812,830 $78,408,744 +$756,969 $1.79 86
2023 Q1 43,448,316 $76,399,987 -$11,115,808 $1.76 94
2022 Q4 50,454,668 $92,275,470 +$3,534,769 $1.83 93
2022 Q3 47,349,877 $130,146,007 -$2,210,164 $2.75 87
2022 Q2 34,541,837 $80,118,569 +$616,524 $2.32 87
2022 Q1 45,899,703 $214,842,059 -$18,674,019 $4.68 85
2021 Q4 46,975,963 $369,875,239 +$7,272,588 $7.87 88
2021 Q3 44,613,693 $372,284,380 -$32,176,410 $8.34 70
2021 Q2 44,408,028 $534,710,703 +$534,405,649 $12.26 69