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