Latest Period
Q4 2025
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
134
Shares (Excl. Options)
67,443,329
Price
$1.10
Save this security page for your next review
Keep this CUSIP in your watchlists so you can revisit quarter changes from one place.
- Type / Class
- Equity / Common Stock
- Symbol
- QSI on Nasdaq
- Shares outstanding
- 182,694,067
- Price per share
- $0.79
- All holders as of 31 Dec 2025
- Q4 2025
- Total 13F shares
- 67,443,329
- Total reported value
- $74,141,655
- % of total 13F portfolios
- 0%
- Share change
- +2,737,397
- Value change
- +$2,647,825
- Number of holders
- 134
- Price from insider filings
- $0.79
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Quick Takeaways
- QSI - Quantum-Si Inc - Common Stock is tracked under CUSIP 74765K105.
- 134 institutions reported positions in Q4 2025.
- 5 significant owners is listed from Schedule 13D/13G reporting.
What Changed
- Holder count moved from 134 to 39 between Q4 2025 and Q1 2026.
- Reported value moved from $74,141,655 to $4,381,649.
Why This Matters
- 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.
Source Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 134 institutions filings for Q4 2025.
Investment Quick Answers
What is CUSIP 74765K105?
CUSIP 74765K105 identifies QSI - Quantum-Si Inc - Common Stock in SEC 13F datasets.
Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.
Next ownership checks
Use the next link that matches the question you still need to answer about this security.
- Latest 13F filings when you want to inspect fresh institutional portfolio moves.
- Latest Schedule 13D/13G reports when you need large-owner changes outside the 13F cycle.
- All institutional ownership pages to compare this security with other holder-history pages.
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 74765K105:
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 |
| 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 Dec 2025, 134 institutional investors reported holding 67,443,329 shares of Quantum-Si Inc - Common Stock (QSI). This represents 37% 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 34% 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. | 7.1% | 13,054,057 | +15% | 0% | $14,359,463 |
| VANGUARD GROUP INC | 5.3% | 9,607,022 | +10% | 0% | $10,567,724 |
| ARK Investment Management LLC | 3.8% | 7,021,571 | -7.9% | 0.05% | $7,723,728 |
| Sumitomo Mitsui Trust Group, Inc. | 2.6% | 4,690,720 | -10% | 0% | $5,159,792 |
| Amova Asset Management Americas, Inc. | 2.6% | 4,690,720 | -10% | 0.06% | $5,112,885 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.3% | 4,114,375 | +9.8% | 0% | $4,526,616 |
| STATE STREET CORP | 2% | 3,562,721 | +26% | 0% | $3,918,993 |
| CITADEL ADVISORS LLC | 1.5% | 2,676,097 | +557% | 0% | $2,943,707 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 1.3% | 2,327,785 | +14% | 0% | $2,560,564 |
| NORTHERN TRUST CORP | 1.2% | 2,207,936 | -5% | 0% | $2,428,730 |
| UBS Group AG | 0.79% | 1,449,512 | +187% | 0% | $1,594,464 |
| TWO SIGMA INVESTMENTS, LP | 0.76% | 1,384,181 | +168% | 0% | $1,522,599 |
| JANE STREET GROUP, LLC | 0.6% | 1,104,033 | -31% | 0% | $1,214,436 |
| Fosun International Ltd | 0.41% | 743,935 | 0% | 0.21% | $818,329 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 0.26% | 468,174 | +0.02% | 0% | $514,991 |
| XTX Topco Ltd | 0.25% | 461,982 | +207% | 0.01% | $508,180 |
| Nuveen, LLC | 0.24% | 447,519 | 0% | 0% | $492,271 |
| Bank of New York Mellon Corp | 0.22% | 406,291 | +2.9% | 0% | $446,920 |
| Invesco Ltd. | 0.22% | 402,821 | +36% | 0% | $443,103 |
| MORGAN STANLEY | 0.22% | 399,994 | +48% | 0% | $439,994 |
| GOLDMAN SACHS GROUP INC | 0.21% | 386,824 | -0.08% | 0% | $425,507 |
| Knollwood Investment Advisory, LLC | 0.16% | 300,000 | 0% | 0.03% | $330,000 |
| Quadrature Capital Ltd | 0.15% | 276,889 | 0% | $304,578 | |
| ALLIANCEBERNSTEIN L.P. | 0.15% | 272,180 | 0% | 0% | $299,398 |
| BARCLAYS PLC | 0.15% | 269,415 | +22% | 0% | $296,357 |
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 |
|---|---|---|---|---|---|
| 2026 Q1 | 5,671,231 | $4,381,649 | -$111,856 | $0.77 | 39 |
| 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 |