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, Q4 2025
Institutional positions in Quantum-Si Inc as of Dec 31, 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
- 135
- +13 vs. Q3 2025
- Shares held
- 67.5M
- +2.92M (+4.5%) vs. Q3 2025
- Total value
- $74.3M
- −$17.0M (−18.6%) vs. Q3 2025
- New holders
- 32
- 38 more added
- Sold out
- 19
- 37 more reduced
3 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 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, Q4 2025
Shares, value and share of portfolio for each institution holding Quantum-Si Inc; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Capital Advisors, Ltd. LLC | 58 | $0 | 0.00% | 00.0% | Unchanged |
| SageView Advisory Group, LLC | 17 | $19 | 0.00% | +17 | New |
| Federation des caisses Desjardins du Quebec | 50 | $55 | 0.00% | 00.0% | Unchanged |
| Walleye Capital LLC | 58 | $64 | 0.00% | +58 | New |
| Rothschild Investment LLC | 70 | $77 | 0.00% | +70 | New |
| United Financial Planning Group LLC | 200 | $220 | 0.00% | +200 | New |
| EverSource Wealth Advisors, LLC | 427 | $470 | 0.00% | 00.0% | Unchanged |
| Allworth Financial LP | 436 | $480 | 0.00% | −415−48.8% | Reduced |
| Medallion Wealth Advisors, LLC | 470 | $517 | 0.00% | +228+94.2% | Added |
| Nisa Investment Advisors, LLC | 608 | $669 | 0.00% | 00.0% | Unchanged |
| TD Waterhouse Canada Inc. | 800 | $872 | 0.00% | 00.0% | Unchanged |
| Optiver Holding B.V. | 927 | $1.02K | 0.00% | −191−17.1% | Reduced |
| Signature Resources Capital Management, LLC | 1,000 | $1.10K | 0.00% | +1,000 | New |
| Sound Income Strategies, LLC | 1,000 | $1.27K | 0.00% | +1,000 | New |
| Archer Investment Corp | 2,000 | $2.20K | 0.00% | 00.0% | Unchanged |
| FNY Investment Advisers, LLC | 4,000 | $4.00K | 0.00% | +4,000 | New |
| Pinney & Scofield, Inc. | 3,680 | $4.05K | 0.00% | 00.0% | Unchanged |
| GF Fund Management Co. Ltd. | 3,723 | $4.09K | 0.00% | +3,723 | New |
| N.E.W. Advisory Services LLC | 3,854 | $4.24K | 0.00% | 00.0% | Unchanged |
| MTM Investment Management, LLC | 4,125 | $4.54K | 0.00% | 00.0% | Unchanged |
| Royal Bank of Canada | 4,467 | $5.00K | 0.00% | −527,826−99.2% | Reduced |
| Amalgamated Bank | 4,935 | $5.00K | 0.00% | +793+19.1% | Added |
| Tucker Asset Management LLC | 4,714 | $5.18K | 0.00% | +4,714 | New |
| Ronald Blue Trust, Inc. | 5,000 | $5.50K | 0.00% | +5,000 | New |
| Wolverine Asset Management LLC | 6,170 | $6.79K | 0.00% | −1,655−21.2% | Reduced |
| GAMMA Investing LLC | 6,991 | $7.69K | 0.00% | +6,991 | New |
| Advisor Group Holdings, Inc. | 7,101 | $7.81K | 0.00% | +5,881+482.0% | Added |
| CWM, LLC | 6,994 | $8.00K | 0.00% | +4,838+224.4% | Added |
| Sterling Capital Management LLC | 9,054 | $9.96K | 0.00% | −1,785−16.5% | Reduced |
| Mirae Asset Global Investments Co., Ltd. | 9,503 | $10.5K | 0.00% | +9,503 | New |
| California State Teachers Retirement System | 9,661 | $10.6K | 0.00% | +854+9.7% | Added |
| Hollencrest Capital Management | 10,000 | $11.0K | 0.00% | −25,000−71.4% | Reduced |
| Glen Eagle Advisors, LLC | 10,000 | $11.0K | 0.00% | 00.0% | Unchanged |
| Red Reef Advisors LLC | 10,000 | $11.0K | 0.01% | +10,000 | New |
| Kestra Advisory Services, LLC | 10,090 | $11.1K | 0.00% | 00.0% | Unchanged |
| Cresset Asset Management, LLC | 10,207 | $11.2K | 0.00% | +10,207 | New |
| CIBC World Markets Corp | 10,392 | $11.4K | 0.00% | +10,392 | New |
| State of Wyoming | 11,089 | $12.2K | 0.00% | +11,089 | New |
| Xponance, Inc. | 11,824 | $13.0K | 0.00% | −128−1.1% | Reduced |
| McAdam, LLC | 12,329 | $13.6K | 0.00% | +12,329 | New |
| Legal & General Group Plc | 12,860 | $14.1K | 0.00% | 00.0% | Unchanged |
| Ewa, LLC | 13,632 | $15.0K | 0.00% | −3,487−20.4% | Reduced |
| Procyon Private Wealth Partners, LLC | 13,671 | $15.0K | 0.00% | 00.0% | Unchanged |
| GWM Advisors LLC | 14,042 | $15.4K | 0.00% | +3,872+38.1% | Added |
| Flagship Private Wealth, LLC | 14,158 | $15.6K | 0.01% | 00.0% | Unchanged |
| Ameritas Investment Partners, Inc. | 14,401 | $15.8K | 0.00% | 00.0% | Unchanged |
| Graham Capital Management, L.P. | 14,422 | $15.9K | 0.00% | +14,422 | New |
| Stratos Wealth Advisors, LLC | 15,036 | $16.5K | 0.00% | +1,500+11.1% | Added |
| Kovack Advisors, Inc. | 16,800 | $18.5K | 0.00% | +16,800 | New |
| Blueshift Asset Management, LLC | 17,442 | $19.2K | 0.01% | +17,442 | New |
| Balyasny Asset Management LLC | 19,300 | $21.2K | 0.00% | −502−2.5% | Reduced |
| Citigroup Inc | 19,776 | $21.8K | 0.00% | −3,897−16.5% | Reduced |
| Victory Capital Management Inc | 19,797 | $21.8K | 0.00% | +2,321+13.3% | Added |
| Capital Investment Advisory Services, LLC | 20,000 | $22.0K | 0.00% | 00.0% | Unchanged |
| Atom Investors LP | 21,995 | $24.2K | 0.00% | +21,995 | New |
| JustInvest LLC | 23,799 | $26.2K | 0.00% | −1,394−5.5% | Reduced |
| Curbstone Financial Management Corp | 24,000 | $26.4K | 0.01% | +24,000 | New |
| HBW Advisory Services LLC | 24,163 | $26.6K | 0.00% | −80−0.3% | Reduced |
| Leonteq Securities AG | 25,000 | $27.5K | 0.00% | 00.0% | Unchanged |
| LPL Financial LLC | 25,217 | $27.7K | 0.00% | −3,243−11.4% | Reduced |
| New York State Common Retirement Fund | 26,084 | $28.7K | 0.00% | 00.0% | Unchanged |
| Neuberger Berman Group LLC | 26,820 | $29.5K | 0.00% | +26,820 | New |
| Russell Investments Group, Ltd. | 26,893 | $29.6K | 0.00% | −5,113−16.0% | Reduced |
| Wealth Management Associates, Inc. | 26,950 | $29.6K | 0.01% | −4,000−12.9% | Reduced |
| Voya Investment Management LLC | 27,246 | $30.0K | 0.00% | 00.0% | Unchanged |
| Commonwealth Equity Services, LLC | 27,960 | $30.8K | 0.00% | −8,219−22.7% | Reduced |
| SG Americas Securities, LLC | 29,106 | $32.0K | 0.00% | −13,001−30.9% | Reduced |
| Northern Lights Advisors, Inc. | 29,989 | $33.0K | 0.02% | +29,989 | New |
| Dimensional Fund Advisors LP | 31,320 | $34.5K | 0.00% | +31,320 | New |
| China Universal Asset Management Co., Ltd. | 31,865 | $35.1K | 0.00% | +31,865 | New |
| Tower Research Capital LLC (TRC) | 32,595 | $35.9K | 0.00% | +17,934+122.3% | Added |
| SEI Investments Co | 33,103 | $36.4K | 0.00% | 00.0% | Unchanged |
| SBI Securities Co., Ltd. | 34,163 | $37.6K | 0.00% | +547+1.6% | Added |
| MetLife Investment Management | 34,222 | $37.6K | 0.00% | −30,346−47.0% | Reduced |
| JTC Employer Solutions Trusteee Ltd | 34,540 | $38.0K | 0.00% | 00.0% | Unchanged |
| Captrust Financial Advisors | 34,603 | $38.1K | 0.00% | −225−0.6% | Reduced |
| BNP Paribas Arbitrage, SA | 36,276 | $39.9K | 0.00% | +5,812+19.1% | Added |
| Red Wave Investments LLC | 37,000 | $40.7K | 0.01% | 00.0% | Unchanged |
| ProShare Advisors LLC | 37,341 | $41.1K | 0.00% | +10,481+39.0% | Added |
| Caitong International Asset Management Co., Ltd | 37,964 | $41.8K | 0.01% | −21,810−36.5% | Reduced |
| Cambridge Investment Research Advisors, Inc. | 37,767 | $42.0K | 0.00% | −1,100−2.8% | Reduced |
| State Board of Administration of Florida Retirement System | 41,282 | $45.4K | 0.00% | +41,282 | New |
| Sanctuary Advisors, LLC | 42,413 | $46.7K | 0.00% | +5,897+16.1% | Added |
| Scientech Research LLC | 45,915 | $50.5K | 0.03% | +45,915 | New |
| Police & Firemen's Retirement System of New Jersey | 46,170 | $50.8K | 0.00% | 00.0% | Unchanged |
| Manufacturers Life Insurance Company, The | 48,372 | $53.2K | 0.00% | +706+1.5% | Added |
| AlphaCore Capital LLC | 49,350 | $54.3K | 0.00% | −53,500−52.0% | Reduced |
| Green Alpha Advisors, LLC | 51,528 | $56.7K | 0.05% | −164,504−76.1% | Reduced |
| Mariner, LLC | 56,880 | $62.6K | 0.00% | +6,351+12.6% | Added |
| Intech Investment Management LLC | 65,636 | $72.2K | 0.00% | −9,125−12.2% | Reduced |
| Mirae Asset Global ETFs Holdings Ltd. | 72,970 | $80.3K | 0.00% | −60.0% | Reduced |
| JPMorgan Chase & Co | 76,909 | $84.6K | 0.00% | +13,629+21.5% | Added |
| Simplex Trading, LLC | 80,507 | $88.6K | 0.00% | −73,576−47.8% | Reduced |
| AQR Capital Management LLC | 86,689 | $95.4K | 0.00% | +2,865+3.4% | Added |
| Price T Rowe Associates Inc | 96,486 | $107.0K | 0.00% | +4,452+4.8% | Added |
| FMR LLC | 97,925 | $107.7K | 0.00% | +7,405+8.2% | Added |
| Jones Financial Companies LLLP | 98,900 | $108.8K | 0.00% | +5,400+5.8% | Added |
| HRT Financial LP | 104,292 | $114.0K | 0.00% | +104,292 | New |
| Deutsche Bank AG | 119,028 | $130.9K | 0.00% | +6,944+6.2% | Added |
| Shay Capital LLC | 149,132 | $164.0K | 0.03% | −5,440−3.5% | Reduced |