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 |
|---|---|---|---|---|---|
| Capital Advisors, Ltd. LLC | 58 | $0 | 0.00% | 00.0% | Unchanged |
| Federation des caisses Desjardins du Quebec | 50 | $71 | 0.00% | 00.0% | Unchanged |
| FSA Wealth Management LLC | 100 | $141 | 0.00% | 00.0% | Unchanged |
| SRS Capital Advisors, Inc. | 104 | $146 | 0.00% | +104 | New |
| Medallion Wealth Advisors, LLC | 242 | $341 | 0.00% | 00.0% | Unchanged |
| Atlantic Union Bankshares Corp | 251 | $354 | 0.00% | +251 | New |
| Bangor Savings Bank | 400 | $564 | 0.00% | 00.0% | Unchanged |
| EverSource Wealth Advisors, LLC | 427 | $602 | 0.00% | −401−48.4% | Reduced |
| Nisa Investment Advisors, LLC | 608 | $857 | 0.00% | −716−54.1% | Reduced |
| TD Waterhouse Canada Inc. | 800 | $1.17K | 0.00% | 00.0% | Unchanged |
| Allworth Financial LP | 851 | $1.20K | 0.00% | +15+1.8% | Added |
| Advisor Group Holdings, Inc. | 1,220 | $1.42K | 0.00% | −38−3.0% | Reduced |
| Optiver Holding B.V. | 1,118 | $1.58K | 0.00% | +1,118 | New |
| Belvedere Trading LLC | 1,390 | $1.96K | 0.00% | −5,832−80.8% | Reduced |
| Archer Investment Corp | 2,000 | $2.82K | 0.00% | 00.0% | Unchanged |
| CWM, LLC | 2,156 | $3.00K | 0.00% | −6,755−75.8% | Reduced |
| Pinney & Scofield, Inc. | 3,680 | $5.19K | 0.00% | 00.0% | Unchanged |
| N.E.W. Advisory Services LLC | 3,854 | $5.43K | 0.00% | 00.0% | Unchanged |
| MTM Investment Management, LLC | 4,125 | $5.82K | 0.00% | 00.0% | Unchanged |
| Amalgamated Bank | 4,142 | $6.00K | 0.00% | 00.0% | Unchanged |
| Principal Securities, Inc. | 6,641 | $9.36K | 0.00% | 00.0% | Unchanged |
| Wolverine Asset Management LLC | 7,825 | $11.0K | 0.00% | −8,676−52.6% | Reduced |
| California State Teachers Retirement System | 8,807 | $12.4K | 0.00% | +6+0.1% | Added |
| TriaGen Wealth Management LLC | 10,000 | $14.1K | 0.00% | 00.0% | Unchanged |
| Glen Eagle Advisors, LLC | 10,000 | $14.1K | 0.00% | 00.0% | Unchanged |
| Kestra Advisory Services, LLC | 10,090 | $14.2K | 0.00% | −42−0.4% | Reduced |
| GWM Advisors LLC | 10,170 | $14.3K | 0.00% | −80−0.8% | Reduced |
| Mark Sheptoff Financial Planning, LLC | 10,500 | $14.8K | 0.01% | −4,000−27.6% | Reduced |
| Sterling Capital Management LLC | 10,839 | $15.3K | 0.00% | +7,444+219.3% | Added |
| Principal Financial Group Inc | 11,156 | $15.7K | 0.00% | +11,156 | New |
| Xponance, Inc. | 11,952 | $16.9K | 0.00% | +901+8.2% | Added |
| Prudential Financial Inc | 12,850 | $18.1K | 0.00% | 00.0% | Unchanged |
| Legal & General Group Plc | 12,860 | $18.1K | 0.00% | 00.0% | Unchanged |
| Stratos Wealth Advisors, LLC | 13,536 | $19.1K | 0.00% | −4,324−24.2% | Reduced |
| Procyon Private Wealth Partners, LLC | 13,671 | $19.3K | 0.00% | 00.0% | Unchanged |
| CIBC World Markets Inc. | 14,000 | $19.7K | 0.00% | −11−0.1% | Reduced |
| Flagship Private Wealth, LLC | 14,158 | $20.0K | 0.01% | 00.0% | Unchanged |
| Ameritas Investment Partners, Inc. | 14,401 | $20.3K | 0.00% | 00.0% | Unchanged |
| Tower Research Capital LLC (TRC) | 14,661 | $20.7K | 0.00% | −246−1.7% | Reduced |
| Jump Financial, LLC | 15,100 | $21.3K | 0.00% | +15,100 | New |
| CIBC Bancorp USA Inc. | 16,745 | $23.6K | 0.00% | +16,745 | New |
| Ewa, LLC | 17,119 | $24.1K | 0.01% | −51,081−74.9% | Reduced |
| Victory Capital Management Inc | 17,476 | $24.6K | 0.00% | +1,259+7.8% | Added |
| DLK Investment Management, LLC | 19,750 | $27.8K | 0.01% | 00.0% | Unchanged |
| Balyasny Asset Management LLC | 19,802 | $27.9K | 0.00% | +19,802 | New |
| Capital Investment Advisory Services, LLC | 20,000 | $28.2K | 0.00% | +10,000+100.0% | Added |
| Citigroup Inc | 23,673 | $33.4K | 0.00% | −25,434−51.8% | Reduced |
| HBW Advisory Services LLC | 24,243 | $34.2K | 0.00% | −100.0% | Reduced |
| Leonteq Securities AG | 25,000 | $35.3K | 0.00% | 00.0% | Unchanged |
| JustInvest LLC | 25,193 | $35.5K | 0.00% | +1,102+4.6% | Added |
| New York State Common Retirement Fund | 26,084 | $36.8K | 0.00% | 00.0% | Unchanged |
| ProShare Advisors LLC | 26,860 | $37.9K | 0.00% | −2,064−7.1% | Reduced |
| Mercer Global Advisors Inc | 26,989 | $38.1K | 0.00% | +1,729+6.8% | Added |
| Voya Investment Management LLC | 27,246 | $38.4K | 0.00% | −11,617−29.9% | Reduced |
| LPL Financial LLC | 28,460 | $40.1K | 0.00% | +5,170+22.2% | Added |
| BNP Paribas Arbitrage, SA | 30,464 | $43.0K | 0.00% | +15,331+101.3% | Added |
| Wealth Management Associates, Inc. | 30,950 | $43.6K | 0.02% | +4,000+14.8% | Added |
| Russell Investments Group, Ltd. | 32,006 | $45.1K | 0.00% | +2,105+7.0% | Added |
| Wolverine Trading, LLC | 33,034 | $45.9K | 0.00% | −7,391−18.3% | Reduced |
| SEI Investments Co | 33,103 | $46.7K | 0.00% | 00.0% | Unchanged |
| SBI Securities Co., Ltd. | 33,616 | $47.4K | 0.00% | +7,475+28.6% | Added |
| JTC Employer Solutions Trusteee Ltd | 34,540 | $49.0K | 0.00% | +21,200+158.9% | Added |
| Captrust Financial Advisors | 34,828 | $49.1K | 0.00% | +518+1.5% | Added |
| Hollencrest Capital Management | 35,000 | $49.4K | 0.00% | +10,000+40.0% | Added |
| Commonwealth Equity Services, LLC | 36,179 | $51.0K | 0.00% | +10,664+41.8% | Added |
| Sanctuary Advisors, LLC | 36,516 | $51.5K | 0.00% | +179+0.5% | Added |
| Red Wave Investments LLC | 37,000 | $52.2K | 0.02% | 00.0% | Unchanged |
| Elite Life Management LLC | 20,611 | $54.2K | 0.11% | +20,611 | New |
| Cambridge Investment Research Advisors, Inc. | 38,867 | $55.0K | 0.00% | 00.0% | Unchanged |
| Engineers Gate Manager LP | 41,451 | $58.4K | 0.00% | +41,451 | New |
| SG Americas Securities, LLC | 42,107 | $59.0K | 0.00% | +9,926+30.8% | Added |
| Police & Firemen's Retirement System of New Jersey | 46,170 | $65.1K | 0.00% | +15,036+48.3% | Added |
| Manufacturers Life Insurance Company, The | 47,666 | $67.2K | 0.00% | −1,416−2.9% | Reduced |
| Mariner, LLC | 50,529 | $71.2K | 0.00% | −65−0.1% | Reduced |
| Caitong International Asset Management Co., Ltd | 59,774 | $84.3K | 0.06% | +59,774 | New |
| JPMorgan Chase & Co | 63,280 | $89.2K | 0.00% | −3,376−5.1% | Reduced |
| MetLife Investment Management | 64,568 | $91.0K | 0.00% | −12,748−16.5% | Reduced |
| Mirae Asset Global ETFs Holdings Ltd. | 72,976 | $102.9K | 0.00% | −4,239−5.5% | Reduced |
| Intech Investment Management LLC | 74,761 | $105.4K | 0.00% | −13,736−15.5% | Reduced |
| AQR Capital Management LLC | 83,824 | $118.2K | 0.00% | −37,879−31.1% | Reduced |
| FMR LLC | 90,520 | $127.6K | 0.00% | +72,000+388.8% | Added |
| Price T Rowe Associates Inc | 92,034 | $130.0K | 0.00% | −28,472−23.6% | Reduced |
| Jones Financial Companies LLLP | 93,500 | $139.3K | 0.00% | +46,600+99.4% | Added |
| AlphaCore Capital LLC | 102,850 | $145.0K | 0.00% | +18,900+22.5% | Added |
| Deutsche Bank AG | 112,084 | $158.0K | 0.00% | +13,552+13.8% | Added |
| Wells Fargo & Company | 135,950 | $191.7K | 0.00% | +34,234+33.7% | Added |
| XTX Topco Ltd | 150,532 | $212.3K | 0.01% | +104,058+223.9% | Added |
| Simplex Trading, LLC | 154,083 | $217.0K | 0.00% | +48,549+46.0% | Added |
| Shay Capital LLC | 154,572 | $217.9K | 0.04% | +24,941+19.2% | Added |
| Pathstone Holdings, LLC | 183,934 | $259.3K | 0.00% | −14,864−7.5% | Reduced |
| IMC-Chicago, LLC | 185,117 | $261.0K | 0.00% | +185,117 | New |
| Davy Global Fund Management Ltd | 189,174 | $266.7K | 0.02% | +72,346+61.9% | Added |
| Green Alpha Advisors, LLC | 216,032 | $304.6K | 0.29% | −12,316−5.4% | Reduced |
| Rhumbline Advisers | 219,965 | $310.1K | 0.00% | +15,998+7.8% | Added |
| Barclays PLC | 221,210 | $311.9K | 0.00% | −17,791−7.4% | Reduced |
| Bridgeway Capital Management, LLC | 261,100 | $368.2K | 0.01% | +65,000+33.1% | Added |
| Morgan Stanley | 271,000 | $382.1K | 0.00% | −18,913−6.5% | Reduced |
| Verdence Capital Advisors LLC | 163,830 | $383.4K | 0.02% | +163,830 | New |
| Alliancebernstein L.P. | 272,180 | $383.8K | 0.00% | 00.0% | Unchanged |
| Invesco Ltd. | 295,728 | $417.0K | 0.00% | +100,278+51.3% | Added |