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, Q2 2021
Institutional positions in Quantum-Si Inc as of Jun 30, 2021. 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
- 72
- +72 vs. Q1 2021
- Shares held
- 44.4M
- +44.4M vs. Q1 2021
- Total value
- $534.9M
- +$534.9M vs. Q1 2021
- New holders
- 72
- 0 more added
- Sold out
- 0
- 0 more reduced
Compare with Q1 2021: 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, Q2 2021
Shares, value and share of portfolio for each institution holding Quantum-Si Inc; share changes are against Q1 2021.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Glenview Capital Management, LLC | 7,187,091 | $88.1M | 1.46% | +7,187,091 | New |
| Foresite Capital Management IV, LLC | 4,463,619 | $54.7M | 7.40% | +4,463,619 | New |
| ARK Investment Management LLCSuperinvestorARK Invest | 4,048,303 | $49.6M | 0.09% | +4,048,303 | New |
| Alyeska Investment Group, L.P. | 3,125,374 | $34.4M | 0.40% | +3,125,374 | New |
| Millennium Management LLC | 2,750,000 | $33.2M | 0.04% | +2,750,000 | New |
| Foresite Capital Management V, LLC | 2,342,061 | $28.7M | 11.30% | +2,342,061 | New |
| Capital International Investors | 2,500,000 | $27.0M | 0.01% | +2,500,000 | New |
| Price T Rowe Associates Inc | 2,194,600 | $25.6M | 0.00% | +2,194,600 | New |
| Farallon Capital Management, L.L.C. | 1,750,000 | $21.5M | 0.10% | +1,750,000 | New |
| Redmile Group, LLC | 1,700,000 | $20.8M | 0.31% | +1,700,000 | New |
| Deerfield Management Company, L.P. (Series C) | 1,400,000 | $17.2M | 0.30% | +1,400,000 | New |
| Nikko Asset Management Americas, Inc. | 1,283,001 | $16.0M | 0.06% | +1,283,001 | New |
| Sumitomo Mitsui Trust Holdings, Inc. | 1,260,628 | $15.5M | 0.01% | +1,260,628 | New |
| Monashee Investment Management LLC | 1,250,000 | $15.3M | 1.83% | +1,250,000 | New |
| CVI Holdings, LLC | 1,200,000 | $14.7M | 0.99% | +1,200,000 | New |
| Citadel Advisors LLC | 867,703 | $10.5M | 0.01% | +867,703 | New |
| Blackstone Group Inc. | 850,000 | $10.4M | 0.02% | +850,000 | New |
| Fosun International Ltd | 743,936 | $9.12M | 0.54% | +743,936 | New |
| TOMS Capital Investment Management LP | 500,000 | $6.13M | 0.85% | +500,000 | New |
| Rubric Capital Management LP | 493,013 | $6.04M | 0.38% | +493,013 | New |
| Clearline Capital LP | 390,153 | $4.78M | 0.71% | +390,153 | New |
| HRT Financial LP | 373,868 | $4.58M | 0.04% | +373,868 | New |
| Prosight Management, LP | 227,391 | $2.79M | 1.77% | +227,391 | New |
| Sculptor Capital LP | 213,000 | $2.60M | 0.02% | +213,000 | New |
| Ikarian Capital, LLC | 160,000 | $1.96M | 0.35% | +160,000 | New |
| Susquehanna International Group, LLP | 135,503 | $1.66M | 0.00% | +135,503 | New |
| TD Asset Management Inc | 150,662 | $1.42M | 0.00% | +150,662 | New |
| Westchester Capital Management, LLC | 114,644 | $1.41M | 0.04% | +114,644 | New |
| Affinity Asset Advisors, LLC | 75,000 | $920.0K | 0.44% | +75,000 | New |
| Morgan Stanley | 63,627 | $780.0K | 0.00% | +63,627 | New |
| Marshall Wace, LLP | 61,655 | $756.0K | 0.00% | +61,655 | New |
| Geode Capital Management, LLC | 61,418 | $752.0K | 0.00% | +61,418 | New |
| Castle Creek Arbitrage, LLC | 55,668 | $682.0K | 0.04% | +55,668 | New |
| Wells Fargo & Company | 51,819 | $636.0K | 0.00% | +51,819 | New |
| Jane Street Group, LLC | 43,604 | $534.0K | 0.00% | +43,604 | New |
| Raymond James Financial Services Advisors, Inc. | 30,544 | $374.0K | 0.00% | +30,544 | New |
| Boothbay Fund Management, LLC | 29,120 | $357.0K | 0.01% | +29,120 | New |
| Group One Trading, L.P. | 27,500 | $337.0K | 0.01% | +27,500 | New |
| Simplex Trading, LLC | 27,290 | $334.0K | 0.01% | +27,290 | New |
| Guidance Point Advisors, LLC | 25,742 | $315.0K | 0.12% | +25,742 | New |
| Raymond James & Associates | 19,494 | $239.0K | 0.00% | +19,494 | New |
| New York Life Investments Alternatives | 17,252 | $212.0K | 0.14% | +17,252 | New |
| Private Advisor Group, LLC | 16,375 | $201.0K | 0.00% | +16,375 | New |
| Bluefin Capital Management, LLC | 15,000 | $184.0K | 0.01% | +15,000 | New |
| Ionic Capital Management LLC | 14,600 | $179.0K | 0.02% | +14,600 | New |
| Wolverine Trading, LLC | 12,155 | $152.0K | 0.00% | +12,155 | New |
| UBS Group AG | 12,156 | $149.0K | 0.00% | +12,156 | New |
| Wealth Management Associates, Inc. | 11,150 | $136.7K | 0.08% | +11,150 | New |
| Strategic Wealth Advisors Group, LLC | 10,660 | $131.0K | 0.01% | +10,660 | New |
| Goldman Sachs Group Inc | 10,421 | $128.0K | 0.00% | +10,421 | New |
| Flagship Private Wealth, LLC | 10,863 | $125.8K | 0.10% | +10,863 | New |
| Cutler Group LP | 9,891 | $121.0K | 0.01% | +9,891 | New |
| Advisory Services Network, LLC | 9,333 | $114.0K | 0.00% | +9,333 | New |
| Belvedere Trading LLC | 4,406 | $54.0K | 0.02% | +4,406 | New |
| Brewin Dolphin Ltd | 3,500 | $42.9K | 0.00% | +3,500 | New |
| FNY Investment Advisers, LLC | 3,492 | $42.0K | 0.02% | +3,492 | New |
| Edge Wealth Management LLC | 2,499 | $30.0K | 0.01% | +2,499 | New |
| Reilly Financial Advisors, LLC | 2,110 | $26.0K | 0.00% | +2,110 | New |
| Advisor Group Holdings, Inc. | 1,957 | $23.0K | 0.00% | +1,957 | New |
| Bank of America Corp | 1,110 | $14.0K | 0.00% | +1,110 | New |
| Quantbot Technologies LP | 1,200 | $14.0K | 0.00% | +1,200 | New |
| Thomas J. Herzfeld Advisors, Inc. | 965 | $12.0K | 0.01% | +965 | New |
| Royal Bank of Canada | 800 | $10.0K | 0.00% | +800 | New |
| Wolff Wiese Magana LLC | 800 | $10.0K | 0.01% | +800 | New |
| Tower Research Capital LLC (TRC) | 620 | $8.00K | 0.00% | +620 | New |
| Fifth Third Bancorp | 300 | $4.00K | 0.00% | +300 | New |
| JPMorgan Chase & Co | 89 | $1.00K | 0.00% | +89 | New |
| City Holding Co | 100 | $1.00K | 0.00% | +100 | New |
| Harbour Investments, Inc. | 100 | $1.00K | 0.00% | +100 | New |
| IFP Advisors, Inc | 100 | $1.00K | 0.00% | +100 | New |
| Steward Partners Investment Advisory, LLC | 100 | $1.00K | 0.00% | +100 | New |
| PEAK6 Investments LLC | 4 | $0 | 0.00% | +4 | New |