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 2025
Institutional positions in Quantum-Si Inc as of Sep 30, 2025. 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
- 125
- −8 vs. Q2 2025
- Shares held
- 64.6M
- +287.5K (+0.4%) vs. Q2 2025
- Total value
- $91.3M
- −$34.8M (−27.6%) vs. Q2 2025
- New holders
- 14
- 43 more added
- Sold out
- 22
- 40 more reduced
2 institutions that held it in Q2 2025 haven't filed for Q3 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q2 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, Q3 2025
Shares, value and share of portfolio for each institution holding Quantum-Si Inc; share changes are against Q2 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| BlackRock, Inc. | 11,321,673 | $16.0M | 0.00% | +473,531+4.4% | Added |
| Vanguard Group Inc | 8,714,507 | $12.3M | 0.00% | +44,846+0.5% | Added |
| ARK Investment Management LLCSuperinvestorARK Invest | 7,624,042 | $10.7M | 0.06% | −336,694−4.2% | Reduced |
| Sumitomo Mitsui Trust Holdings, Inc. | 5,217,499 | $7.36M | 0.00% | −403,804−7.2% | Reduced |
| Nikko Asset Management Americas, Inc. | 5,217,499 | $7.36M | 0.07% | −403,804−7.2% | Reduced |
| Geode Capital Management, LLC | 3,747,169 | $5.28M | 0.00% | +299,431+8.7% | Added |
| State Street Corp | 2,817,490 | $3.97M | 0.00% | +61,053+2.2% | Added |
| Millennium Management LLC | 2,669,959 | $3.76M | 0.00% | −1,109,300−29.4% | Reduced |
| Northern Trust Corp | 2,323,042 | $3.28M | 0.00% | +33,586+1.5% | Added |
| Susquehanna International Group, LLP | 2,041,095 | $2.88M | 0.00% | +1,055,011+107.0% | Added |
| Jane Street Group, LLC | 1,610,023 | $2.27M | 0.00% | +1,325,270+465.4% | Added |
| Fosun International Ltd | 743,935 | $1.05M | 0.39% | 00.0% | Unchanged |
| Squarepoint Ops LLC | 613,475 | $865.0K | 0.00% | +613,475 | New |
| Royal Bank of Canada | 532,293 | $750.0K | 0.00% | +72,004+15.6% | Added |
| Two Sigma Investments, LP | 515,852 | $727.4K | 0.00% | −48,590−8.6% | Reduced |
| UBS Group AG | 504,859 | $711.9K | 0.00% | −284,711−36.1% | Reduced |
| Charles Schwab Investment Management Inc | 468,088 | $660.0K | 0.00% | +36,641+8.5% | Added |
| Nuveen, LLC | 447,519 | $631.0K | 0.00% | −678,565−60.3% | Reduced |
| Citadel Advisors LLC | 407,047 | $573.9K | 0.00% | −151,260−27.1% | Reduced |
| Bank of New York Mellon Corp | 394,905 | $556.8K | 0.00% | +42,173+12.0% | Added |
| Goldman Sachs Group Inc | 387,151 | $545.9K | 0.00% | −506,949−56.7% | Reduced |
| Group One Trading, L.P. | 377,774 | $532.7K | 0.02% | +243,142+180.6% | Added |
| Bank of America Corp | 348,007 | $490.7K | 0.00% | −117,992−25.3% | Reduced |
| Knollwood Investment Advisory, LLC | 300,000 | $423.0K | 0.04% | 00.0% | Unchanged |
| Invesco Ltd. | 295,728 | $417.0K | 0.00% | +100,278+51.3% | Added |
| Alliancebernstein L.P. | 272,180 | $383.8K | 0.00% | 00.0% | Unchanged |
| Verdence Capital Advisors LLC | 163,830 | $383.4K | 0.02% | +163,830 | New |
| Morgan Stanley | 271,000 | $382.1K | 0.00% | −18,913−6.5% | Reduced |
| Bridgeway Capital Management, LLC | 261,100 | $368.2K | 0.01% | +65,000+33.1% | Added |
| Barclays PLC | 221,210 | $311.9K | 0.00% | −17,791−7.4% | Reduced |
| Rhumbline Advisers | 219,965 | $310.1K | 0.00% | +15,998+7.8% | Added |
| Green Alpha Advisors, LLC | 216,032 | $304.6K | 0.29% | −12,316−5.4% | Reduced |
| Davy Global Fund Management Ltd | 189,174 | $266.7K | 0.02% | +72,346+61.9% | Added |
| IMC-Chicago, LLC | 185,117 | $261.0K | 0.00% | +185,117 | New |
| Pathstone Holdings, LLC | 183,934 | $259.3K | 0.00% | −14,864−7.5% | Reduced |
| Shay Capital LLC | 154,572 | $217.9K | 0.04% | +24,941+19.2% | Added |
| Simplex Trading, LLC | 154,083 | $217.0K | 0.00% | +48,549+46.0% | Added |
| XTX Topco Ltd | 150,532 | $212.3K | 0.01% | +104,058+223.9% | Added |
| Wells Fargo & Company | 135,950 | $191.7K | 0.00% | +34,234+33.7% | Added |
| Deutsche Bank AG | 112,084 | $158.0K | 0.00% | +13,552+13.8% | Added |
| AlphaCore Capital LLC | 102,850 | $145.0K | 0.00% | +18,900+22.5% | Added |
| Jones Financial Companies LLLP | 93,500 | $139.3K | 0.00% | +46,600+99.4% | Added |
| Price T Rowe Associates Inc | 92,034 | $130.0K | 0.00% | −28,472−23.6% | Reduced |
| FMR LLC | 90,520 | $127.6K | 0.00% | +72,000+388.8% | Added |
| AQR Capital Management LLC | 83,824 | $118.2K | 0.00% | −37,879−31.1% | Reduced |
| Intech Investment Management LLC | 74,761 | $105.4K | 0.00% | −13,736−15.5% | Reduced |
| Mirae Asset Global ETFs Holdings Ltd. | 72,976 | $102.9K | 0.00% | −4,239−5.5% | Reduced |
| MetLife Investment Management | 64,568 | $91.0K | 0.00% | −12,748−16.5% | Reduced |
| JPMorgan Chase & Co | 63,280 | $89.2K | 0.00% | −3,376−5.1% | Reduced |
| Caitong International Asset Management Co., Ltd | 59,774 | $84.3K | 0.06% | +59,774 | New |
| Mariner, LLC | 50,529 | $71.2K | 0.00% | −65−0.1% | Reduced |
| Manufacturers Life Insurance Company, The | 47,666 | $67.2K | 0.00% | −1,416−2.9% | Reduced |
| Police & Firemen's Retirement System of New Jersey | 46,170 | $65.1K | 0.00% | +15,036+48.3% | Added |
| SG Americas Securities, LLC | 42,107 | $59.0K | 0.00% | +9,926+30.8% | Added |
| Engineers Gate Manager LP | 41,451 | $58.4K | 0.00% | +41,451 | New |
| Cambridge Investment Research Advisors, Inc. | 38,867 | $55.0K | 0.00% | 00.0% | Unchanged |
| Elite Life Management LLC | 20,611 | $54.2K | 0.11% | +20,611 | New |
| Red Wave Investments LLC | 37,000 | $52.2K | 0.02% | 00.0% | Unchanged |
| Sanctuary Advisors, LLC | 36,516 | $51.5K | 0.00% | +179+0.5% | Added |
| Commonwealth Equity Services, LLC | 36,179 | $51.0K | 0.00% | +10,664+41.8% | Added |
| Hollencrest Capital Management | 35,000 | $49.4K | 0.00% | +10,000+40.0% | Added |
| Captrust Financial Advisors | 34,828 | $49.1K | 0.00% | +518+1.5% | Added |
| JTC Employer Solutions Trusteee Ltd | 34,540 | $49.0K | 0.00% | +21,200+158.9% | Added |
| SBI Securities Co., Ltd. | 33,616 | $47.4K | 0.00% | +7,475+28.6% | Added |
| SEI Investments Co | 33,103 | $46.7K | 0.00% | 00.0% | Unchanged |
| Wolverine Trading, LLC | 33,034 | $45.9K | 0.00% | −7,391−18.3% | Reduced |
| Russell Investments Group, Ltd. | 32,006 | $45.1K | 0.00% | +2,105+7.0% | Added |
| Wealth Management Associates, Inc. | 30,950 | $43.6K | 0.02% | +4,000+14.8% | Added |
| BNP Paribas Arbitrage, SA | 30,464 | $43.0K | 0.00% | +15,331+101.3% | Added |
| LPL Financial LLC | 28,460 | $40.1K | 0.00% | +5,170+22.2% | Added |
| Voya Investment Management LLC | 27,246 | $38.4K | 0.00% | −11,617−29.9% | Reduced |
| Mercer Global Advisors Inc | 26,989 | $38.1K | 0.00% | +1,729+6.8% | Added |
| ProShare Advisors LLC | 26,860 | $37.9K | 0.00% | −2,064−7.1% | Reduced |
| New York State Common Retirement Fund | 26,084 | $36.8K | 0.00% | 00.0% | Unchanged |
| JustInvest LLC | 25,193 | $35.5K | 0.00% | +1,102+4.6% | Added |
| Leonteq Securities AG | 25,000 | $35.3K | 0.00% | 00.0% | Unchanged |
| HBW Advisory Services LLC | 24,243 | $34.2K | 0.00% | −100.0% | Reduced |
| Citigroup Inc | 23,673 | $33.4K | 0.00% | −25,434−51.8% | Reduced |
| Capital Investment Advisory Services, LLC | 20,000 | $28.2K | 0.00% | +10,000+100.0% | Added |
| Balyasny Asset Management LLC | 19,802 | $27.9K | 0.00% | +19,802 | New |
| DLK Investment Management, LLC | 19,750 | $27.8K | 0.01% | 00.0% | Unchanged |
| Victory Capital Management Inc | 17,476 | $24.6K | 0.00% | +1,259+7.8% | Added |
| Ewa, LLC | 17,119 | $24.1K | 0.01% | −51,081−74.9% | Reduced |
| CIBC Bancorp USA Inc. | 16,745 | $23.6K | 0.00% | +16,745 | New |
| Jump Financial, LLC | 15,100 | $21.3K | 0.00% | +15,100 | New |
| Tower Research Capital LLC (TRC) | 14,661 | $20.7K | 0.00% | −246−1.7% | Reduced |
| Ameritas Investment Partners, Inc. | 14,401 | $20.3K | 0.00% | 00.0% | Unchanged |
| Flagship Private Wealth, LLC | 14,158 | $20.0K | 0.01% | 00.0% | Unchanged |
| CIBC World Markets Inc. | 14,000 | $19.7K | 0.00% | −11−0.1% | Reduced |
| Procyon Private Wealth Partners, LLC | 13,671 | $19.3K | 0.00% | 00.0% | Unchanged |
| Stratos Wealth Advisors, LLC | 13,536 | $19.1K | 0.00% | −4,324−24.2% | Reduced |
| Legal & General Group Plc | 12,860 | $18.1K | 0.00% | 00.0% | Unchanged |
| Prudential Financial Inc | 12,850 | $18.1K | 0.00% | 00.0% | Unchanged |
| Xponance, Inc. | 11,952 | $16.9K | 0.00% | +901+8.2% | Added |
| Principal Financial Group Inc | 11,156 | $15.7K | 0.00% | +11,156 | New |
| Sterling Capital Management LLC | 10,839 | $15.3K | 0.00% | +7,444+219.3% | Added |
| Mark Sheptoff Financial Planning, LLC | 10,500 | $14.8K | 0.01% | −4,000−27.6% | Reduced |
| GWM Advisors LLC | 10,170 | $14.3K | 0.00% | −80−0.8% | Reduced |
| Kestra Advisory Services, LLC | 10,090 | $14.2K | 0.00% | −42−0.4% | Reduced |
| TriaGen Wealth Management LLC | 10,000 | $14.1K | 0.00% | 00.0% | Unchanged |