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 |
|---|---|---|---|---|---|
| BlackRock, Inc. | 13,414,949 | $10.4M | 0.00% | +360,892+2.8% | Added |
| Vanguard Capital Management LLC | 7,021,907 | $5.43M | 0.00% | +7,021,907 | New |
| ARK Investment Management LLCSuperinvestorARK Invest | 6,878,899 | $5.32M | 0.04% | −142,672−2.0% | Reduced |
| Nikko Asset Management Americas, Inc. | 4,391,666 | $3.43M | 0.05% | −299,054−6.4% | Reduced |
| Sumitomo Mitsui Trust Holdings, Inc. | 4,391,666 | $3.40M | 0.00% | −299,054−6.4% | Reduced |
| Geode Capital Management, LLC | 3,835,121 | $2.97M | 0.00% | −279,254−6.8% | Reduced |
| State Street Corp | 3,770,689 | $2.92M | 0.00% | +207,968+5.8% | Added |
| AQR Capital Management LLC | 2,392,179 | $1.85M | 0.00% | +2,305,490+2,659.5% | Added |
| UBS Group AG | 1,702,527 | $1.32M | 0.00% | +253,015+17.5% | Added |
| Vanguard Portfolio Management LLC | 1,520,646 | $1.18M | 0.00% | +1,520,646 | New |
| Susquehanna International Group, LLP | 1,464,568 | $1.13M | 0.00% | −863,217−37.1% | Reduced |
| Northern Trust Corp | 1,260,701 | $975.8K | 0.00% | −947,235−42.9% | Reduced |
| Vanguard Fiduciary Trust Co | 1,117,252 | $864.8K | 0.00% | +1,117,252 | New |
| Fosun International Ltd | 743,935 | $575.8K | 0.14% | 00.0% | Unchanged |
| Charles Schwab Investment Management Inc | 457,571 | $354.2K | 0.00% | −10,603−2.3% | Reduced |
| Nuveen, LLC | 451,367 | $349.4K | 0.00% | +3,848+0.9% | Added |
| Goldman Sachs Group Inc | 444,177 | $343.8K | 0.00% | +57,353+14.8% | Added |
| Invesco Ltd. | 406,690 | $314.8K | 0.00% | +3,869+1.0% | Added |
| XTX Topco Ltd | 389,254 | $301.3K | 0.01% | −72,728−15.7% | Reduced |
| Alliancebernstein L.P. | 272,180 | $299.4K | 0.00% | 00.0% | Unchanged |
| Bank of New York Mellon Corp | 383,088 | $296.5K | 0.00% | −23,203−5.7% | Reduced |
| Ieq Capital, LLC | 357,688 | $276.9K | 0.00% | +357,688 | New |
| Knollwood Investment Advisory, LLC | 300,000 | $232.2K | 0.02% | 00.0% | Unchanged |
| Davy Global Fund Management Ltd | 292,107 | $226.1K | 0.02% | +38,212+15.1% | Added |
| Group One Trading, L.P. | 283,981 | $219.8K | 0.01% | +38,180+15.5% | Added |
| Bridgeway Capital Management, LLC | 261,100 | $202.1K | 0.00% | 00.0% | Unchanged |
| IMC-Chicago, LLC | 220,876 | $171.0K | 0.00% | +220,876 | New |
| CIBC Bancorp USA Inc. | 208,510 | $161.4K | 0.00% | +208,510 | New |
| Verdence Capital Advisors LLC | 203,855 | $157.8K | 0.01% | +16,050+8.5% | Added |
| Mariner, LLC | 199,692 | $154.5K | 0.00% | +142,812+251.1% | Added |
| Rhumbline Advisers | 193,068 | $149.4K | 0.00% | −527−0.3% | Reduced |
| Bank of America Corp | 161,987 | $125.4K | 0.00% | −96,458−37.3% | Reduced |
| Shay Capital LLC | 150,922 | $116.8K | 0.02% | +1,790+1.2% | Added |
| Morgan Stanley | 129,940 | $100.6K | 0.00% | −270,054−67.5% | Reduced |
| AlphaCore Capital LLC | 128,449 | $99.4K | 0.00% | +79,099+160.3% | Added |
| CWM, LLC | 126,632 | $98.0K | 0.00% | +119,638+1,710.6% | Added |
| Deutsche Bank AG | 119,028 | $91.7K | 0.00% | 00.0% | Unchanged |
| Renaissance Technologies LLC | 117,900 | $91.3K | 0.00% | +117,900 | New |
| Los Angeles Capital Management LLC | 116,341 | $90.0K | 0.00% | +23,331+25.1% | Added |
| Jones Financial Companies LLLP | 109,900 | $84.0K | 0.00% | +11,000+11.1% | Added |
| MetLife Investment Management | 101,555 | $78.6K | 0.00% | +67,333+196.8% | Added |
| Price T Rowe Associates Inc | 96,486 | $75.0K | 0.00% | 00.0% | Unchanged |
| Simplex Trading, LLC | 90,531 | $70.1K | 0.00% | +10,024+12.5% | Added |
| Vanguard Global Advisers, LLC | 84,757 | $65.6K | 0.00% | +84,757 | New |
| Cerity Partners LLC | 80,650 | $62.4K | 0.00% | +80,650 | New |
| JPMorgan Chase & Co | 83,519 | $61.6K | 0.00% | +6,610+8.6% | Added |
| Mirae Asset Global ETFs Holdings Ltd. | 74,928 | $58.0K | 0.00% | +1,958+2.7% | Added |
| Wealth Enhancement Advisory Services, LLC | 89,536 | $57.9K | 0.00% | +89,536 | New |
| Captrust Financial Advisors | 69,036 | $53.4K | 0.00% | +34,433+99.5% | Added |
| Virtu Financial LLC | 64,751 | $50.0K | 0.00% | −173,628−72.8% | Reduced |
| Wells Fargo & Company | 63,868 | $49.4K | 0.00% | −112,264−63.7% | Reduced |
| Quantbot Technologies LP | 58,461 | $45.2K | 0.00% | +58,461 | New |
| Mercer Global Advisors Inc | 55,195 | $42.7K | 0.00% | +55,195 | New |
| Two Sigma Investments, LP | 52,924 | $41.0K | 0.00% | −1,331,257−96.2% | Reduced |
| Creative Planning | 52,548 | $40.7K | 0.00% | +52,548 | New |
| Manufacturers Life Insurance Company, The | 47,453 | $36.7K | 0.00% | −919−1.9% | Reduced |
| Intech Investment Management LLC | 46,486 | $36.0K | 0.00% | −19,150−29.2% | Reduced |
| Police & Firemen's Retirement System of New Jersey | 46,170 | $35.7K | 0.00% | 00.0% | Unchanged |
| Green Alpha Advisors, LLC | 43,208 | $33.4K | 0.03% | −8,320−16.1% | Reduced |
| Sanctuary Advisors, LLC | 42,824 | $33.1K | 0.00% | +411+1.0% | Added |
| Cambridge Investment Research Advisors, Inc. | 41,809 | $32.0K | 0.00% | +4,042+10.7% | Added |
| State Board of Administration of Florida Retirement System | 41,282 | $32.0K | 0.00% | 00.0% | Unchanged |
| Nine Masts Capital Ltd | 41,134 | $31.8K | 0.00% | +41,134 | New |
| Hollencrest Capital Management | 40,111 | $31.0K | 0.00% | +30,111+301.1% | Added |
| Barclays PLC | 39,137 | $30.3K | 0.00% | −230,278−85.5% | Reduced |
| BNP Paribas Arbitrage, SA | 38,390 | $29.7K | 0.00% | +2,114+5.8% | Added |
| Red Wave Investments LLC | 37,000 | $28.6K | 0.01% | 00.0% | Unchanged |
| Merit Financial Group, LLC | 36,347 | $28.1K | 0.00% | +36,347 | New |
| JTC Employer Solutions Trusteee Ltd | 34,540 | $27.0K | 0.00% | 00.0% | Unchanged |
| China Universal Asset Management Co., Ltd. | 34,702 | $26.9K | 0.00% | +2,837+8.9% | Added |
| SG Americas Securities, LLC | 33,677 | $26.0K | 0.00% | +4,571+15.7% | Added |
| ProShare Advisors LLC | 33,239 | $25.7K | 0.00% | −4,102−11.0% | Reduced |
| SEI Investments Co | 33,103 | $25.6K | 0.00% | 00.0% | Unchanged |
| SBI Securities Co., Ltd. | 32,133 | $24.9K | 0.00% | −2,030−5.9% | Reduced |
| FMR LLC | 31,968 | $24.7K | 0.00% | −65,957−67.4% | Reduced |
| Northern Lights Advisors, Inc. | 29,989 | $23.2K | 0.02% | 00.0% | Unchanged |
| Commonwealth Equity Services, LLC | 29,792 | $23.1K | 0.00% | +1,832+6.6% | Added |
| Brighton Jones LLC | 27,560 | $21.3K | 0.00% | +27,560 | New |
| Voya Investment Management LLC | 27,246 | $21.1K | 0.00% | 00.0% | Unchanged |
| Wealth Management Associates, Inc. | 26,950 | $20.9K | 0.01% | 00.0% | Unchanged |
| New York State Common Retirement Fund | 26,084 | $20.2K | 0.00% | 00.0% | Unchanged |
| Pallas Capital Advisors LLC | 25,757 | $19.9K | 0.00% | +25,757 | New |
| Kovack Advisors, Inc. | 30,000 | $19.7K | 0.00% | +13,200+78.6% | Added |
| Leonteq Securities AG | 25,000 | $19.4K | 0.00% | 00.0% | Unchanged |
| Tower Research Capital LLC (TRC) | 24,943 | $19.3K | 0.00% | −7,652−23.5% | Reduced |
| JustInvest LLC | 23,991 | $18.6K | 0.00% | +192+0.8% | Added |
| Colony Group, LLC | 23,517 | $18.2K | 0.00% | +23,517 | New |
| HBW Advisory Services LLC | 22,697 | $17.6K | 0.00% | −1,466−6.1% | Reduced |
| Krilogy Financial LLC | 16,729 | $17.4K | 0.00% | +16,729 | New |
| LPL Financial LLC | 22,467 | $17.4K | 0.00% | −2,750−10.9% | Reduced |
| Prudential Financial Inc | 21,570 | $16.7K | 0.00% | +21,570 | New |
| Capital Investment Advisory Services, LLC | 20,000 | $15.5K | 0.00% | 00.0% | Unchanged |
| Victory Capital Management Inc | 19,808 | $15.3K | 0.00% | +11+0.1% | Added |
| DLK Investment Management, LLC | 16,750 | $13.0K | 0.01% | +16,750 | New |
| Buckingham Strategic Partners | 16,473 | $12.8K | 0.00% | +16,473 | New |
| GWM Advisors LLC | 15,820 | $12.2K | 0.00% | +1,778+12.7% | Added |
| Citadel Advisors LLC | 15,546 | $12.0K | 0.00% | −2,660,551−99.4% | Reduced |
| Essential Partners LLC | 15,436 | $11.9K | 0.00% | +15,436 | New |
| Stratos Wealth Advisors, LLC | 15,036 | $11.6K | 0.00% | 00.0% | Unchanged |
| Integrated Wealth Concepts LLC | 14,499 | $11.2K | 0.00% | +14,499 | New |