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, Q1 2026
Institutional positions in Quantum-Si Inc as of Mar 31, 2026. 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
- 157
- +24 vs. Q4 2025
- Shares held
- 63.1M
- +5.24M (+9.0%) vs. Q4 2025
- Total value
- $49.0M
- −$14.8M (−23.2%) vs. Q4 2025
- New holders
- 45
- 39 more added
- Sold out
- 21
- 37 more reduced
2 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: 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, Q1 2026
Shares, value and share of portfolio for each institution holding Quantum-Si Inc; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Intech Investment Management LLC | 46,486 | $36.0K | 0.00% | −19,150−29.2% | Reduced |
| Manufacturers Life Insurance Company, The | 47,453 | $36.7K | 0.00% | −919−1.9% | Reduced |
| Creative Planning | 52,548 | $40.7K | 0.00% | +52,548 | New |
| Two Sigma Investments, LP | 52,924 | $41.0K | 0.00% | −1,331,257−96.2% | Reduced |
| Mercer Global Advisors Inc | 55,195 | $42.7K | 0.00% | +55,195 | New |
| Quantbot Technologies LP | 58,461 | $45.2K | 0.00% | +58,461 | New |
| Wells Fargo & Company | 63,868 | $49.4K | 0.00% | −112,264−63.7% | Reduced |
| Virtu Financial LLC | 64,751 | $50.0K | 0.00% | −173,628−72.8% | Reduced |
| Captrust Financial Advisors | 69,036 | $53.4K | 0.00% | +34,433+99.5% | Added |
| Wealth Enhancement Advisory Services, LLC | 89,536 | $57.9K | 0.00% | +89,536 | New |
| Mirae Asset Global ETFs Holdings Ltd. | 74,928 | $58.0K | 0.00% | +1,958+2.7% | Added |
| JPMorgan Chase & Co | 83,519 | $61.6K | 0.00% | +6,610+8.6% | Added |
| Cerity Partners LLC | 80,650 | $62.4K | 0.00% | +80,650 | New |
| Vanguard Global Advisers, LLC | 84,757 | $65.6K | 0.00% | +84,757 | New |
| Simplex Trading, LLC | 90,531 | $70.1K | 0.00% | +10,024+12.5% | Added |
| Price T Rowe Associates Inc | 96,486 | $75.0K | 0.00% | 00.0% | Unchanged |
| MetLife Investment Management | 101,555 | $78.6K | 0.00% | +67,333+196.8% | Added |
| Jones Financial Companies LLLP | 109,900 | $84.0K | 0.00% | +11,000+11.1% | Added |
| Los Angeles Capital Management LLC | 116,341 | $90.0K | 0.00% | +23,331+25.1% | Added |
| Renaissance Technologies LLC | 117,900 | $91.3K | 0.00% | +117,900 | New |
| Deutsche Bank AG | 119,028 | $91.7K | 0.00% | 00.0% | Unchanged |
| CWM, LLC | 126,632 | $98.0K | 0.00% | +119,638+1,710.6% | Added |
| AlphaCore Capital LLC | 128,449 | $99.4K | 0.00% | +79,099+160.3% | Added |
| Morgan Stanley | 129,940 | $100.6K | 0.00% | −270,054−67.5% | Reduced |
| Shay Capital LLC | 150,922 | $116.8K | 0.02% | +1,790+1.2% | Added |
| Bank of America Corp | 161,987 | $125.4K | 0.00% | −96,458−37.3% | Reduced |
| Rhumbline Advisers | 193,068 | $149.4K | 0.00% | −527−0.3% | Reduced |
| Mariner, LLC | 199,692 | $154.5K | 0.00% | +142,812+251.1% | Added |
| Verdence Capital Advisors LLC | 203,855 | $157.8K | 0.01% | +16,050+8.5% | Added |
| CIBC Bancorp USA Inc. | 208,510 | $161.4K | 0.00% | +208,510 | New |
| IMC-Chicago, LLC | 220,876 | $171.0K | 0.00% | +220,876 | New |
| Bridgeway Capital Management, LLC | 261,100 | $202.1K | 0.00% | 00.0% | Unchanged |
| Group One Trading, L.P. | 283,981 | $219.8K | 0.01% | +38,180+15.5% | Added |
| Davy Global Fund Management Ltd | 292,107 | $226.1K | 0.02% | +38,212+15.1% | Added |
| Knollwood Investment Advisory, LLC | 300,000 | $232.2K | 0.02% | 00.0% | Unchanged |
| Ieq Capital, LLC | 357,688 | $276.9K | 0.00% | +357,688 | New |
| Bank of New York Mellon Corp | 383,088 | $296.5K | 0.00% | −23,203−5.7% | Reduced |
| Alliancebernstein L.P. | 272,180 | $299.4K | 0.00% | 00.0% | Unchanged |
| XTX Topco Ltd | 389,254 | $301.3K | 0.01% | −72,728−15.7% | Reduced |
| Invesco Ltd. | 406,690 | $314.8K | 0.00% | +3,869+1.0% | Added |
| Goldman Sachs Group Inc | 444,177 | $343.8K | 0.00% | +57,353+14.8% | Added |
| Nuveen, LLC | 451,367 | $349.4K | 0.00% | +3,848+0.9% | Added |
| Charles Schwab Investment Management Inc | 457,571 | $354.2K | 0.00% | −10,603−2.3% | Reduced |
| Fosun International Ltd | 743,935 | $575.8K | 0.14% | 00.0% | Unchanged |
| Vanguard Fiduciary Trust Co | 1,117,252 | $864.8K | 0.00% | +1,117,252 | New |
| Northern Trust Corp | 1,260,701 | $975.8K | 0.00% | −947,235−42.9% | Reduced |
| Susquehanna International Group, LLP | 1,464,568 | $1.13M | 0.00% | −863,217−37.1% | Reduced |
| Vanguard Portfolio Management LLC | 1,520,646 | $1.18M | 0.00% | +1,520,646 | New |
| UBS Group AG | 1,702,527 | $1.32M | 0.00% | +253,015+17.5% | Added |
| AQR Capital Management LLC | 2,392,179 | $1.85M | 0.00% | +2,305,490+2,659.5% | Added |
| State Street Corp | 3,770,689 | $2.92M | 0.00% | +207,968+5.8% | Added |
| Geode Capital Management, LLC | 3,835,121 | $2.97M | 0.00% | −279,254−6.8% | Reduced |
| Sumitomo Mitsui Trust Holdings, Inc. | 4,391,666 | $3.40M | 0.00% | −299,054−6.4% | Reduced |
| Nikko Asset Management Americas, Inc. | 4,391,666 | $3.43M | 0.05% | −299,054−6.4% | Reduced |
| ARK Investment Management LLCSuperinvestorARK Invest | 6,878,899 | $5.32M | 0.04% | −142,672−2.0% | Reduced |
| Vanguard Capital Management LLC | 7,021,907 | $5.43M | 0.00% | +7,021,907 | New |
| BlackRock, Inc. | 13,414,949 | $10.4M | 0.00% | +360,892+2.8% | Added |
| Jane Street Group, LLC | 0 | $0 | 0.00% | −1,104,033−100.0% | Sold out |
| Quadrature Capital Ltd | 0 | $0 | 0.00% | −276,889−100.0% | Sold out |
| Millennium Management LLC | 0 | $0 | 0.00% | −191,791−100.0% | Sold out |
| HRT Financial LP | 0 | $0 | 0.00% | −104,292−100.0% | Sold out |
| Scientech Research LLC | 0 | $0 | 0.00% | −45,915−100.0% | Sold out |
| Dimensional Fund Advisors LP | 0 | $0 | 0.00% | −31,320−100.0% | Sold out |
| Neuberger Berman Group LLC | 0 | $0 | 0.00% | −26,820−100.0% | Sold out |
| Curbstone Financial Management Corp | 0 | $0 | 0.00% | −24,000−100.0% | Sold out |
| Atom Investors LP | 0 | $0 | 0.00% | −21,995−100.0% | Sold out |
| Balyasny Asset Management LLC | 0 | $0 | 0.00% | −19,300−100.0% | Sold out |
| Blueshift Asset Management, LLC | 0 | $0 | 0.00% | −17,442−100.0% | Sold out |
| Ewa, LLC | 0 | $0 | 0.00% | −13,632−100.0% | Sold out |
| McAdam, LLC | 0 | $0 | 0.00% | −12,329−100.0% | Sold out |
| State of Wyoming | 0 | $0 | 0.00% | −11,089−100.0% | Sold out |
| Kestra Advisory Services, LLC | 0 | $0 | 0.00% | −10,090−100.0% | Sold out |
| Tucker Asset Management LLC | 0 | $0 | 0.00% | −4,714−100.0% | Sold out |
| Amalgamated Bank | 0 | $0 | 0.00% | −4,935−100.0% | Sold out |
| Signature Resources Capital Management, LLC | 0 | $0 | 0.00% | −1,000−100.0% | Sold out |
| United Financial Planning Group LLC | 0 | $0 | 0.00% | −200−100.0% | Sold out |
| SageView Advisory Group, LLC | 0 | $0 | 0.00% | −17−100.0% | Sold out |
| Capital Advisors, Ltd. LLC | 0 | $0 | 0.00% | −58−100.0% | Sold out |
| Vanguard Group Inc | – | – | – | – | Not filed |
| CIBC World Markets Corp | – | – | – | – | Not filed |