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, Q3 2021
Institutional positions in Quantum-Si Inc as of Sep 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
- 73
- +1 vs. Q2 2021
- Shares held
- 44.6M
- +208.6K (+0.5%) vs. Q2 2021
- Total value
- $372.4M
- −$162.5M (−30.4%) vs. Q2 2021
- New holders
- 25
- 17 more added
- Sold out
- 24
- 14 more reduced
Compare with Q2 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, Q3 2021
Shares, value and share of portfolio for each institution holding Quantum-Si Inc; share changes are against Q2 2021.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Quantbot Technologies LP | 21 | $0 | 0.00% | −1,179−98.3% | Reduced |
| Tower Research Capital LLC (TRC) | 28 | $0 | 0.00% | −592−95.5% | Reduced |
| IFP Advisors, Inc | 100 | $1.00K | 0.00% | 00.0% | Unchanged |
| Eagle Bay Advisors LLC | 277 | $2.00K | 0.00% | +277 | New |
| Fifth Third Bancorp | 300 | $3.00K | 0.00% | 00.0% | Unchanged |
| Concord Wealth Partners | 300 | $3.00K | 0.00% | +300 | New |
| State of Wyoming | 332 | $3.00K | 0.00% | +332 | New |
| Total Clarity Wealth Management, Inc. | 750 | $6.00K | 0.00% | +750 | New |
| Wolff Wiese Magana LLC | 800 | $7.00K | 0.00% | 00.0% | Unchanged |
| Thomas J. Herzfeld Advisors, Inc. | 965 | $8.00K | 0.00% | 00.0% | Unchanged |
| Reilly Financial Advisors, LLC | 2,110 | $18.0K | 0.00% | 00.0% | Unchanged |
| Edge Wealth Management LLC | 2,499 | $21.0K | 0.00% | 00.0% | Unchanged |
| Advisor Group Holdings, Inc. | 3,120 | $26.0K | 0.00% | +1,163+59.4% | Added |
| FNY Investment Advisers, LLC | 3,492 | $29.0K | 0.01% | 00.0% | Unchanged |
| Brewin Dolphin Ltd | 3,500 | $29.2K | 0.00% | 00.0% | Unchanged |
| American Portfolios Advisors | 3,500 | $29.2K | 0.00% | +3,500 | New |
| Cutler Group LP | 3,891 | $32.0K | 0.00% | −6,000−60.7% | Reduced |
| Penserra Capital Management LLC | 5,042 | $42.0K | 0.00% | +5,042 | New |
| Citigroup Inc | 8,133 | $68.0K | 0.00% | +8,133 | New |
| Boothbay Fund Management, LLC | 13,526 | $113.0K | 0.00% | −15,594−53.6% | Reduced |
| Procyon Private Wealth Partners, LLC | 13,711 | $114.0K | 0.03% | +13,711 | New |
| Flagship Private Wealth, LLC | 14,158 | $118.0K | 0.09% | +3,295+30.3% | Added |
| Ionic Capital Management LLC | 14,271 | $119.0K | 0.02% | −329−2.3% | Reduced |
| Wolverine Trading, LLC | 14,397 | $121.0K | 0.00% | +2,242+18.4% | Added |
| Bank of America Corp | 15,048 | $126.0K | 0.00% | +13,938+1,255.7% | Added |
| National Asset Management, Inc. | 15,000 | $126.0K | 0.00% | +15,000 | New |
| Wealth Management Associates, Inc. | 16,025 | $133.6K | 0.08% | +4,875+43.7% | Added |
| Capstone Investment Advisors, LLC | 16,710 | $139.0K | 0.00% | +16,710 | New |
| Virtu Financial LLC | 16,935 | $141.0K | 0.01% | +16,935 | New |
| UBS Group AG | 21,225 | $177.0K | 0.00% | +9,069+74.6% | Added |
| Cambridge Investment Research Advisors, Inc. | 22,707 | $189.0K | 0.00% | +22,707 | New |
| Jane Street Group, LLC | 24,831 | $207.0K | 0.00% | −18,773−43.1% | Reduced |
| Guidance Point Advisors, LLC | 25,742 | $214.0K | 0.08% | 00.0% | Unchanged |
| Raymond James Financial Services Advisors, Inc. | 30,444 | $254.0K | 0.00% | −100−0.3% | Reduced |
| Charles Schwab Investment Management Inc | 32,018 | $268.0K | 0.00% | +32,018 | New |
| Bank of New York Mellon Corp | 32,200 | $269.0K | 0.00% | +32,200 | New |
| Red Wave Investments LLC | 37,000 | $309.0K | 0.11% | +37,000 | New |
| Simplex Trading, LLC | 25,880 | $312.0K | 0.01% | −1,410−5.2% | Reduced |
| Kepos Capital LP | 38,500 | $321.0K | 0.02% | +38,500 | New |
| Private Advisor Group, LLC | 40,520 | $338.0K | 0.00% | +24,145+147.5% | Added |
| Royal Bank of Canada | 53,000 | $442.0K | 0.00% | +52,200+6,525.0% | Added |
| Stifel Financial Corp | 54,292 | $453.0K | 0.00% | +54,292 | New |
| Asset Management Corp | 59,444 | $496.0K | 0.31% | +59,444 | New |
| Westchester Capital Management, LLC | 64,964 | $542.0K | 0.02% | −49,680−43.3% | Reduced |
| Cubist Systematic Strategies, LLC | 67,300 | $561.0K | 0.01% | +67,300 | New |
| Morgan Stanley | 79,408 | $662.0K | 0.00% | +15,781+24.8% | Added |
| Wells Fargo & Company | 79,934 | $666.0K | 0.00% | +28,115+54.3% | Added |
| Ikarian Capital, LLC | 144,406 | $1.20M | 0.28% | −15,594−9.7% | Reduced |
| Northern Trust Corp | 144,933 | $1.21M | 0.00% | +144,933 | New |
| TD Asset Management Inc | 150,662 | $1.26M | 0.00% | 00.0% | Unchanged |
| Susquehanna International Group, LLP | 159,068 | $1.33M | 0.00% | +23,565+17.4% | Added |
| Goldman Sachs Group Inc | 163,051 | $1.36M | 0.00% | +152,630+1,464.6% | Added |
| Millennium Management LLC | 208,722 | $1.74M | 0.00% | −2,541,278−92.4% | Reduced |
| State Street Corp | 252,900 | $2.11M | 0.00% | +252,900 | New |
| Clearline Capital LP | 377,897 | $3.15M | 0.41% | −12,256−3.1% | Reduced |
| Neumann Advisory Hong Kong Ltd | 492,733 | $4.11M | 0.73% | +492,733 | New |
| Guggenheim Capital LLC | 591,458 | $4.93M | 0.03% | +591,458 | New |
| Rubric Capital Management LP | 672,385 | $5.61M | 0.32% | +179,372+36.4% | Added |
| Fosun International Ltd | 743,936 | $6.20M | 0.32% | 00.0% | Unchanged |
| Geode Capital Management, LLC | 763,918 | $6.37M | 0.00% | +702,500+1,143.8% | Added |
| Blackstone Group Inc. | 850,000 | $7.09M | 0.02% | 00.0% | Unchanged |
| Farallon Capital Management, L.L.C. | 1,000,000 | $8.34M | 0.04% | −750,000−42.9% | Reduced |
| BlackRock Inc. | 1,154,116 | $9.63M | 0.00% | +1,154,116 | New |
| Sumitomo Mitsui Trust Holdings, Inc. | 1,324,484 | $11.0M | 0.01% | +63,856+5.1% | Added |
| Nikko Asset Management Americas, Inc. | 1,324,484 | $11.2M | 0.05% | +41,483+3.2% | Added |
| Deerfield Management Company, L.P. (Series C) | 1,400,000 | $11.7M | 0.23% | 00.0% | Unchanged |
| Vanguard Group Inc | 1,533,603 | $12.8M | 0.00% | +1,533,603 | New |
| Price T Rowe Associates Inc | 2,194,600 | $18.3M | 0.00% | 00.0% | Unchanged |
| Foresite Capital Management V, LLC | 2,342,061 | $19.5M | 6.07% | 00.0% | Unchanged |
| Capital International Investors | 2,500,000 | $20.9M | 0.00% | 00.0% | Unchanged |
| Foresite Capital Management IV, LLC | 4,463,619 | $37.2M | 5.48% | 00.0% | Unchanged |
| Glenview Capital Management, LLC | 6,000,000 | $50.0M | 0.91% | −1,187,091−16.5% | Reduced |
| ARK Investment Management LLCSuperinvestorARK Invest | 12,698,381 | $105.9M | 0.25% | +8,650,078+213.7% | Added |
| Alyeska Investment Group, L.P. | 0 | $0 | 0.00% | −3,125,374−100.0% | Sold out |
| Redmile Group, LLC | 0 | $0 | 0.00% | −1,700,000−100.0% | Sold out |
| Monashee Investment Management LLC | 0 | $0 | 0.00% | −1,250,000−100.0% | Sold out |
| CVI Holdings, LLC | 0 | $0 | 0.00% | −1,200,000−100.0% | Sold out |
| Citadel Advisors LLC | 0 | $0 | 0.00% | −867,703−100.0% | Sold out |
| TOMS Capital Investment Management LP | 0 | $0 | 0.00% | −500,000−100.0% | Sold out |
| HRT Financial LP | 0 | $0 | 0.00% | −373,868−100.0% | Sold out |
| Prosight Management, LP | 0 | $0 | 0.00% | −227,391−100.0% | Sold out |
| Sculptor Capital LP | 0 | $0 | 0.00% | −213,000−100.0% | Sold out |
| Affinity Asset Advisors, LLC | 0 | $0 | 0.00% | −75,000−100.0% | Sold out |
| Marshall Wace, LLP | 0 | $0 | 0.00% | −61,655−100.0% | Sold out |
| Castle Creek Arbitrage, LLC | 0 | $0 | 0.00% | −55,668−100.0% | Sold out |
| Group One Trading, L.P. | 0 | $0 | 0.00% | −27,500−100.0% | Sold out |
| Raymond James & Associates | 0 | $0 | 0.00% | −19,494−100.0% | Sold out |
| New York Life Investments Alternatives | 0 | $0 | 0.00% | −17,252−100.0% | Sold out |
| Bluefin Capital Management, LLC | 0 | $0 | 0.00% | −15,000−100.0% | Sold out |
| Strategic Wealth Advisors Group, LLC | 0 | $0 | 0.00% | −10,660−100.0% | Sold out |
| Advisory Services Network, LLC | 0 | $0 | 0.00% | −9,333−100.0% | Sold out |
| Belvedere Trading LLC | 0 | $0 | 0.00% | −4,406−100.0% | Sold out |
| JPMorgan Chase & Co | 0 | $0 | 0.00% | −89−100.0% | Sold out |
| City Holding Co | 0 | $0 | 0.00% | −100−100.0% | Sold out |
| Harbour Investments, Inc. | 0 | $0 | 0.00% | −100−100.0% | Sold out |
| Steward Partners Investment Advisory, LLC | 0 | $0 | 0.00% | −100−100.0% | Sold out |
| PEAK6 Investments LLC | 0 | $0 | 0.00% | −4−100.0% | Sold out |