Quantum-Si Inc - Common Stock (QSI)

Historical Holders 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 as of 30 Sep 2025
64,420,076
Total reported value
$90,831,895
% of total 13F portfolios
0%
Share change
+68,962
Value change
-$422,858
Avg buy value change
+0%
Avg sell value change
-0%
Number of holders
119
Price from insider filings
$1.28
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% $23,326,875 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% $7,217,902 5,965,208 Sumitomo Mitsui Trust Group, Inc. 31 Dec 2024
Nikko Asset Management Americas, Inc. 4.8% $7,217,902 5,965,208 Nikko Asset Management Americas, Inc. 31 Dec 2024
As of 30 Sep 2025, Quantum-Si Inc - Common Stock (QSI) has 119 institutional shareholders filing 13F forms. They hold 64,420,076 shares. of 182,694,067 outstanding shares (35%) .

Top 25 institutional shareholders own 33% of the company.

Filer Ownership Nb Shares 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 (% of par) Investors
2025 Q4 101,296 $111,409 -$187,559 110% 4
2025 Q3 64,420,076 $90,831,895 -$422,858 141% 119
2025 Q2 64,302,080 $126,030,953 +$13,332,090 196% 131
2025 Q1 57,702,101 $69,187,968 +$4,278,851 120% 132
2024 Q4 53,650,133 $144,828,921 +$7,467,683 270% 119
2024 Q3 52,018,403 $45,873,394 -$1,304,094 88.22% 106
2024 Q2 53,534,496 $56,052,952 +$296,093 105% 97
2024 Q1 52,939,609 $104,094,301 -$7,060,197 197% 93
2023 Q4 56,545,513 $113,571,460 +$3,979,280 201% 88
2023 Q3 54,518,149 $90,500,891 +$17,074,897 166% 94
2023 Q2 43,838,780 $78,455,574 +$764,050 179% 88
2023 Q1 43,470,316 $76,438,490 -$11,104,148 176% 95
2022 Q4 50,563,530 $92,475,906 +$3,565,426 183% 98
2022 Q3 47,618,704 $130,884,473 -$2,677,367 274.99% 96
2022 Q2 48,637,778 $139,588,569 +$2,799,359 232% 93
2022 Q1 45,913,518 $214,907,059 -$18,856,558 468.04% 86
2021 Q4 47,044,785 $370,416,832 +$7,975,560 786.97% 91
2021 Q3 44,603,838 $372,106,029 -$32,106,463 834% 70
2021 Q2 44,270,353 $533,450,402 +$533,145,402 1,226% 70