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 |
|---|---|---|---|---|---|
| BlackRock, Inc. | 13,054,057 | $14.4M | 0.00% | +1,732,384+15.3% | Added |
| Vanguard Group Inc | 9,607,022 | $10.6M | 0.00% | +892,515+10.2% | Added |
| ARK Investment Management LLCSuperinvestorARK Invest | 7,021,571 | $7.72M | 0.05% | −602,471−7.9% | Reduced |
| Sumitomo Mitsui Trust Holdings, Inc. | 4,690,720 | $5.16M | 0.00% | −526,779−10.1% | Reduced |
| Nikko Asset Management Americas, Inc. | 4,690,720 | $5.11M | 0.06% | −526,779−10.1% | Reduced |
| Geode Capital Management, LLC | 4,114,375 | $4.53M | 0.00% | +367,206+9.8% | Added |
| State Street Corp | 3,562,721 | $3.92M | 0.00% | +745,231+26.5% | Added |
| Citadel Advisors LLC | 2,676,097 | $2.94M | 0.00% | +2,269,050+557.4% | Added |
| Susquehanna International Group, LLP | 2,327,785 | $2.56M | 0.00% | +286,690+14.0% | Added |
| Northern Trust Corp | 2,207,936 | $2.43M | 0.00% | −115,106−5.0% | Reduced |
| UBS Group AG | 1,449,512 | $1.59M | 0.00% | +944,653+187.1% | Added |
| Two Sigma Investments, LP | 1,384,181 | $1.52M | 0.00% | +868,329+168.3% | Added |
| Jane Street Group, LLC | 1,104,033 | $1.21M | 0.00% | −505,990−31.4% | Reduced |
| Fosun International Ltd | 743,935 | $818.3K | 0.19% | 00.0% | Unchanged |
| Charles Schwab Investment Management Inc | 468,174 | $515.0K | 0.00% | +860.0% | Added |
| XTX Topco Ltd | 461,982 | $508.2K | 0.01% | +311,450+206.9% | Added |
| Nuveen, LLC | 447,519 | $492.3K | 0.00% | 00.0% | Unchanged |
| Bank of New York Mellon Corp | 406,291 | $446.9K | 0.00% | +11,386+2.9% | Added |
| Invesco Ltd. | 402,821 | $443.1K | 0.00% | +107,093+36.2% | Added |
| Morgan Stanley | 399,994 | $440.0K | 0.00% | +128,994+47.6% | Added |
| Goldman Sachs Group Inc | 386,824 | $425.5K | 0.00% | −327−0.1% | Reduced |
| Knollwood Investment Advisory, LLC | 300,000 | $330.0K | 0.03% | 00.0% | Unchanged |
| Quadrature Capital Ltd | 276,889 | $304.6K | 0.00% | +276,889 | New |
| Alliancebernstein L.P. | 272,180 | $299.4K | 0.00% | 00.0% | Unchanged |
| Barclays PLC | 269,415 | $296.4K | 0.00% | +48,205+21.8% | Added |
| Bridgeway Capital Management, LLC | 261,100 | $287.2K | 0.01% | 00.0% | Unchanged |
| Bank of America Corp | 258,445 | $284.3K | 0.00% | −89,562−25.7% | Reduced |
| Davy Global Fund Management Ltd | 253,895 | $279.3K | 0.02% | +64,721+34.2% | Added |
| Group One Trading, L.P. | 245,801 | $270.4K | 0.01% | −131,973−34.9% | Reduced |
| Virtu Financial LLC | 238,379 | $262.0K | 0.01% | +238,379 | New |
| Rhumbline Advisers | 193,595 | $212.9K | 0.00% | −26,370−12.0% | Reduced |
| Millennium Management LLC | 191,791 | $211.0K | 0.00% | −2,478,168−92.8% | Reduced |
| Verdence Capital Advisors LLC | 187,805 | $206.6K | 0.01% | +23,975+14.6% | Added |
| Wells Fargo & Company | 176,132 | $193.7K | 0.00% | +40,182+29.6% | Added |
| Los Angeles Capital Management LLC | 93,010 | $188.8K | 0.00% | +93,010 | New |
| Shay Capital LLC | 149,132 | $164.0K | 0.03% | −5,440−3.5% | Reduced |
| Deutsche Bank AG | 119,028 | $130.9K | 0.00% | +6,944+6.2% | Added |
| HRT Financial LP | 104,292 | $114.0K | 0.00% | +104,292 | New |
| Jones Financial Companies LLLP | 98,900 | $108.8K | 0.00% | +5,400+5.8% | Added |
| FMR LLC | 97,925 | $107.7K | 0.00% | +7,405+8.2% | Added |
| Price T Rowe Associates Inc | 96,486 | $107.0K | 0.00% | +4,452+4.8% | Added |
| AQR Capital Management LLC | 86,689 | $95.4K | 0.00% | +2,865+3.4% | Added |
| Simplex Trading, LLC | 80,507 | $88.6K | 0.00% | −73,576−47.8% | Reduced |
| JPMorgan Chase & Co | 76,909 | $84.6K | 0.00% | +13,629+21.5% | Added |
| Mirae Asset Global ETFs Holdings Ltd. | 72,970 | $80.3K | 0.00% | −60.0% | Reduced |
| Intech Investment Management LLC | 65,636 | $72.2K | 0.00% | −9,125−12.2% | Reduced |
| Mariner, LLC | 56,880 | $62.6K | 0.00% | +6,351+12.6% | Added |
| Green Alpha Advisors, LLC | 51,528 | $56.7K | 0.05% | −164,504−76.1% | Reduced |
| AlphaCore Capital LLC | 49,350 | $54.3K | 0.00% | −53,500−52.0% | Reduced |
| Manufacturers Life Insurance Company, The | 48,372 | $53.2K | 0.00% | +706+1.5% | Added |
| Police & Firemen's Retirement System of New Jersey | 46,170 | $50.8K | 0.00% | 00.0% | Unchanged |
| Scientech Research LLC | 45,915 | $50.5K | 0.03% | +45,915 | New |
| Sanctuary Advisors, LLC | 42,413 | $46.7K | 0.00% | +5,897+16.1% | Added |
| State Board of Administration of Florida Retirement System | 41,282 | $45.4K | 0.00% | +41,282 | New |
| Cambridge Investment Research Advisors, Inc. | 37,767 | $42.0K | 0.00% | −1,100−2.8% | Reduced |
| Caitong International Asset Management Co., Ltd | 37,964 | $41.8K | 0.01% | −21,810−36.5% | Reduced |
| ProShare Advisors LLC | 37,341 | $41.1K | 0.00% | +10,481+39.0% | Added |
| Red Wave Investments LLC | 37,000 | $40.7K | 0.01% | 00.0% | Unchanged |
| BNP Paribas Arbitrage, SA | 36,276 | $39.9K | 0.00% | +5,812+19.1% | Added |
| Captrust Financial Advisors | 34,603 | $38.1K | 0.00% | −225−0.6% | Reduced |
| JTC Employer Solutions Trusteee Ltd | 34,540 | $38.0K | 0.00% | 00.0% | Unchanged |
| MetLife Investment Management | 34,222 | $37.6K | 0.00% | −30,346−47.0% | Reduced |
| SBI Securities Co., Ltd. | 34,163 | $37.6K | 0.00% | +547+1.6% | Added |
| SEI Investments Co | 33,103 | $36.4K | 0.00% | 00.0% | Unchanged |
| Tower Research Capital LLC (TRC) | 32,595 | $35.9K | 0.00% | +17,934+122.3% | Added |
| China Universal Asset Management Co., Ltd. | 31,865 | $35.1K | 0.00% | +31,865 | New |
| Dimensional Fund Advisors LP | 31,320 | $34.5K | 0.00% | +31,320 | New |
| Northern Lights Advisors, Inc. | 29,989 | $33.0K | 0.02% | +29,989 | New |
| SG Americas Securities, LLC | 29,106 | $32.0K | 0.00% | −13,001−30.9% | Reduced |
| Commonwealth Equity Services, LLC | 27,960 | $30.8K | 0.00% | −8,219−22.7% | Reduced |
| Voya Investment Management LLC | 27,246 | $30.0K | 0.00% | 00.0% | Unchanged |
| Wealth Management Associates, Inc. | 26,950 | $29.6K | 0.01% | −4,000−12.9% | Reduced |
| Russell Investments Group, Ltd. | 26,893 | $29.6K | 0.00% | −5,113−16.0% | Reduced |
| Neuberger Berman Group LLC | 26,820 | $29.5K | 0.00% | +26,820 | New |
| New York State Common Retirement Fund | 26,084 | $28.7K | 0.00% | 00.0% | Unchanged |
| LPL Financial LLC | 25,217 | $27.7K | 0.00% | −3,243−11.4% | Reduced |
| Leonteq Securities AG | 25,000 | $27.5K | 0.00% | 00.0% | Unchanged |
| HBW Advisory Services LLC | 24,163 | $26.6K | 0.00% | −80−0.3% | Reduced |
| Curbstone Financial Management Corp | 24,000 | $26.4K | 0.01% | +24,000 | New |
| JustInvest LLC | 23,799 | $26.2K | 0.00% | −1,394−5.5% | Reduced |
| Atom Investors LP | 21,995 | $24.2K | 0.00% | +21,995 | New |
| Capital Investment Advisory Services, LLC | 20,000 | $22.0K | 0.00% | 00.0% | Unchanged |
| Victory Capital Management Inc | 19,797 | $21.8K | 0.00% | +2,321+13.3% | Added |
| Citigroup Inc | 19,776 | $21.8K | 0.00% | −3,897−16.5% | Reduced |
| Balyasny Asset Management LLC | 19,300 | $21.2K | 0.00% | −502−2.5% | Reduced |
| Blueshift Asset Management, LLC | 17,442 | $19.2K | 0.01% | +17,442 | New |
| Kovack Advisors, Inc. | 16,800 | $18.5K | 0.00% | +16,800 | New |
| Stratos Wealth Advisors, LLC | 15,036 | $16.5K | 0.00% | +1,500+11.1% | Added |
| Graham Capital Management, L.P. | 14,422 | $15.9K | 0.00% | +14,422 | New |
| Ameritas Investment Partners, Inc. | 14,401 | $15.8K | 0.00% | 00.0% | Unchanged |
| Flagship Private Wealth, LLC | 14,158 | $15.6K | 0.01% | 00.0% | Unchanged |
| GWM Advisors LLC | 14,042 | $15.4K | 0.00% | +3,872+38.1% | Added |
| Procyon Private Wealth Partners, LLC | 13,671 | $15.0K | 0.00% | 00.0% | Unchanged |
| Ewa, LLC | 13,632 | $15.0K | 0.00% | −3,487−20.4% | Reduced |
| Legal & General Group Plc | 12,860 | $14.1K | 0.00% | 00.0% | Unchanged |
| McAdam, LLC | 12,329 | $13.6K | 0.00% | +12,329 | New |
| Xponance, Inc. | 11,824 | $13.0K | 0.00% | −128−1.1% | Reduced |
| State of Wyoming | 11,089 | $12.2K | 0.00% | +11,089 | New |
| CIBC World Markets Corp | 10,392 | $11.4K | 0.00% | +10,392 | New |
| Cresset Asset Management, LLC | 10,207 | $11.2K | 0.00% | +10,207 | New |