Quantum-Si Inc
QSI- Exchange
- Nasdaq
- Industry
- Measuring & Controlling Devices, NEC
- SEC CIK
- 0001816431
In the last 90 days, Quantum-Si Inc insiders filed 0 open-market purchases and 3 sales; 141 institutions reported holding it in 13F filings for Q2 2026, worth $46.8M in total; ARK Invest is the only superinvestor holding it.
13F holders, Q4 2022
Institutional positions in Quantum-Si Inc as of Dec 31, 2022. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 105
- +5 vs. Q3 2022
- Shares held
- 49.7M
- +2.73M (+5.8%) vs. Q3 2022
- Total value
- $90.9M
- −$38.2M (−29.6%) vs. Q3 2022
- New holders
- 17
- 35 more added
- Sold out
- 12
- 22 more reduced
2 institutions that held it in Q3 2022 haven't filed for Q4 2022 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 2022: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting QSI on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 141 | $46.8M |
| Q1 2026 | 157 | $49.0M |
| Q4 2025 | 135 | $74.3M |
| Q3 2025 | 125 | $91.3M |
| Q2 2025 | 135 | $126.2M |
| Q1 2025 | 137 | $69.3M |
| Q4 2024 | 121 | $144.8M |
| Q3 2024 | 107 | $45.9M |
| Q2 2024 | 99 | $56.1M |
| Q1 2024 | 95 | $104.1M |
| Q4 2023 | 91 | $113.6M |
| Q3 2023 | 96 | $90.5M |
| Q2 2023 | 91 | $78.5M |
| Q1 2023 | 100 | $76.5M |
| Q4 2022 | 105 | $90.9M |
| Q3 2022 | 102 | $130.8M |
| Q2 2022 | 102 | $139.6M |
| Q1 2022 | 92 | $215.0M |
| Q4 2021 | 93 | $370.6M |
| Q3 2021 | 73 | $372.4M |
| Q2 2021 | 72 | $534.9M |
| Q1 2021 | 0 | $0 |
Institutions, Q4 2022
Shares, value and share of portfolio for each institution holding Quantum-Si Inc; share changes are against Q3 2022.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Glenview Capital Management, LLC | 4,249,956 | $7.78M | 0.19% | −847,016−16.6% | Reduced |
| Vanguard Group Inc | 4,947,178 | $9.05M | 0.00% | +26,256+0.5% | Added |
| BlackRock Inc. | 6,461,509 | $11.8M | 0.00% | +106,769+1.7% | Added |
| ARK Investment Management LLCSuperinvestorARK Invest | 11,856,184 | $21.7M | 0.19% | −1,381,606−10.4% | Reduced |
| IFP Advisors, Inc | 900 | – | – | 00.0% | Unchanged |
| Deerfield Management Company, L.P. (Series C) | 0 | $0 | 0.00% | −1,400,000−100.0% | Sold out |
| Intrepid Family Office LLC | 0 | $0 | 0.00% | −50,000−100.0% | Sold out |
| Virtu Financial LLC | 0 | $0 | 0.00% | −12,509−100.0% | Sold out |
| Abacus Planning Group, Inc. | 0 | $0 | 0.00% | −12,510−100.0% | Sold out |
| Two Sigma Securities, LLC | 0 | $0 | 0.00% | −11,983−100.0% | Sold out |
| Teacher Retirement System of Texas | 0 | $0 | 0.00% | −11,801−100.0% | Sold out |
| Jane Street Group, LLC | 0 | $0 | 0.00% | −11,455−100.0% | Sold out |
| MTM Investment Management, LLC | 0 | $0 | 0.00% | −10,900−100.0% | Sold out |
| TD Waterhouse Canada Inc. | 0 | $0 | 0.00% | −2,025−100.0% | Sold out |
| Global Trust Asset Management, LLC | 0 | $0 | 0.00% | −855−100.0% | Sold out |
| Clearstead Advisors, LLC | 0 | $0 | 0.00% | −400−100.0% | Sold out |
| Glassman Wealth Services | 0 | $0 | 0.00% | −143−100.0% | Sold out |
| Foresite Capital Opportunity Management V, LLC | – | – | – | – | Not filed |
| American Portfolios Advisors | – | – | – | – | Not filed |