Latest Period
Q1 2026
Security Snapshot
Quantum-Si Inc - Common Stock (QSI) Institutional Ownership
CUSIP: 74765K105
13F Institutional Holders and Ownership History from Q2 2021 to Q1 2026
Institutions Reporting
155
Shares (Excl. Options)
63,088,581
Price
$0.77
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- Security type / class
- Equity / Common Stock
- Symbol
- QSI on Nasdaq
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 63,088,581
- Total 13F value
- $48,930,989
- Portfolio coverage rank
- 0%
- Share change
- -4,574,401
- Value change
- -$4,176,811
- Number of holders
- 155
- Shares outstanding
- 182,694,067
- SEC-reported price per share
- $0.93
- Insider filing price
- $0.93
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- QSI - Quantum-Si Inc - Common Stock is tracked under CUSIP 74765K105.
- 155 institutions reported positions in Q1 2026.
- 5 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 134 to 155 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $74,141,655 to $48,930,989.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 155 institutions filings for Q1 2026.
Security key
74765K105
Latest holder period
Q1 2026
13F holders
155
13D/G owners
5
CIK / CUSIP context first
Open Q1 2026 holders
QSI full holder history
Quantum-Si Inc SEC filings
Quantum-Si Inc company facts
Quantum-Si Inc insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 74765K105:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
5
Security
QSI
| 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 |
| Nikko Asset Management Americas, Inc. | 4.8% | $7,217,902 | 5,965,208 | Nikko Asset Management Americas, Inc. | 31 Dec 2024 | |||
| Sumitomo Mitsui Trust Group, Inc. | 4.8% | $7,217,902 | 5,965,208 | Sumitomo Mitsui Trust Group, Inc. | 31 Dec 2024 |
As of 31 Mar 2026, 155 institutional investors reported holding 63,088,581 shares of Quantum-Si Inc - Common Stock (QSI). This represents 35% of the company’s total 182,694,067 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
32%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 7.3% | 13,414,949 | +2.8% | 0% | $10,383,169 |
| VANGUARD CAPITAL MANAGEMENT LLC | 3.8% | 7,021,907 | 0% | 0% | $5,434,956 |
| ARK Investment Management LLC | 3.8% | 6,878,899 | -2% | 0.04% | $5,324,268 |
| Amova Asset Management Americas, Inc. | 2.4% | 4,391,666 | -6.4% | 0.05% | $3,425,499 |
| Sumitomo Mitsui Trust Group, Inc. | 2.4% | 4,391,666 | -6.4% | 0% | $3,399,149 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.1% | 3,835,121 | -6.8% | 0% | $2,969,295 |
| STATE STREET CORP | 2.1% | 3,770,689 | +5.8% | 0% | $2,918,513 |
| AQR CAPITAL MANAGEMENT LLC | 1.3% | 2,392,179 | +2659% | 0% | $1,851,547 |
| UBS Group AG | 0.93% | 1,702,527 | +17% | 0% | $1,317,757 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 0.83% | 1,520,646 | 0% | 0% | $1,176,980 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 0.8% | 1,464,568 | -37% | 0% | $1,133,576 |
| NORTHERN TRUST CORP | 0.69% | 1,260,701 | -43% | 0% | $975,783 |
| VANGUARD FIDUCIARY TRUST CO | 0.61% | 1,117,252 | 0% | 0% | $864,753 |
| Fosun International Ltd | 0.41% | 743,935 | 0% | 0.16% | $575,806 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 0.25% | 457,571 | -2.3% | 0% | $354,160 |
| Nuveen, LLC | 0.25% | 451,367 | +0.86% | 0% | $349,358 |
| GOLDMAN SACHS GROUP INC | 0.24% | 444,177 | +15% | 0% | $343,793 |
| Invesco Ltd. | 0.22% | 406,690 | +0.96% | 0% | $314,778 |
| XTX Topco Ltd | 0.21% | 389,254 | -16% | 0.01% | $301,283 |
| Bank of New York Mellon Corp | 0.21% | 383,088 | -5.7% | 0% | $296,510 |
| IEQ CAPITAL, LLC | 0.2% | 357,688 | 0% | $276,850 | |
| Knollwood Investment Advisory, LLC | 0.16% | 300,000 | 0% | 0.02% | $232,200 |
| IQ EQ FUND MANAGEMENT (IRELAND) Ltd | 0.16% | 292,107 | +15% | 0.02% | $226,091 |
| GROUP ONE TRADING LLC | 0.16% | 283,981 | +16% | 0.01% | $219,801 |
| ALLIANCEBERNSTEIN L.P. | 0.15% | 272,180 | 0% | 0% | $299,398 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
20
Latest
Q1 2026
Rows shown
1-20 of 20
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 63,088,581 | $48,930,989 | -$4,176,811 | $0.77 | 155 |
| 2025 Q4 | 67,443,329 | $74,141,655 | +$2,647,825 | $1.10 | 134 |
| 2025 Q3 | 64,444,810 | $90,874,495 | -$423,140 | $1.41 | 120 |
| 2025 Q2 | 64,302,080 | $126,030,953 | +$13,332,090 | $1.96 | 131 |
| 2025 Q1 | 57,702,101 | $69,187,968 | +$4,278,851 | $1.20 | 132 |
| 2024 Q4 | 53,650,133 | $144,828,921 | +$7,467,683 | $2.70 | 119 |
| 2024 Q3 | 52,018,403 | $45,873,394 | -$1,304,094 | $0.88 | 106 |
| 2024 Q2 | 53,534,496 | $56,052,952 | +$296,093 | $1.05 | 97 |
| 2024 Q1 | 52,939,609 | $104,094,301 | -$7,060,197 | $1.97 | 93 |
| 2023 Q4 | 56,545,513 | $113,571,460 | +$3,979,280 | $2.01 | 88 |
| 2023 Q3 | 54,518,149 | $90,500,891 | +$17,074,897 | $1.66 | 94 |
| 2023 Q2 | 43,838,780 | $78,455,574 | +$764,050 | $1.79 | 88 |
| 2023 Q1 | 43,470,316 | $76,438,490 | -$11,104,148 | $1.76 | 95 |
| 2022 Q4 | 50,563,530 | $92,475,906 | +$3,565,426 | $1.83 | 98 |
| 2022 Q3 | 47,618,704 | $130,884,473 | -$2,677,367 | $2.75 | 96 |
| 2022 Q2 | 48,637,778 | $139,588,569 | +$2,799,359 | $2.32 | 93 |
| 2022 Q1 | 45,913,518 | $214,907,059 | -$18,856,558 | $4.68 | 86 |
| 2021 Q4 | 47,044,785 | $370,416,832 | +$7,975,560 | $7.87 | 91 |
| 2021 Q3 | 44,603,838 | $372,106,029 | -$32,106,463 | $8.34 | 70 |
| 2021 Q2 | 44,270,353 | $533,450,402 | +$533,145,402 | $12.26 | 70 |