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, Q2 2026
Institutional positions in Quantum-Si Inc as of Jun 30, 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
- 141
- −14 vs. Q1 2026
- Shares held
- 52.9M
- −10.1M (−16.1%) vs. Q1 2026
- Total value
- $46.8M
- −$2.07M (−4.2%) vs. Q1 2026
- New holders
- 27
- 34 more added
- Sold out
- 41
- 58 more reduced
2 institutions that held it in Q1 2026 haven't filed for Q2 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q1 2026: 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 | $91.7M |
| Q2 2025 | 135 | $127.1M |
| Q1 2025 | 137 | $69.3M |
| Q4 2024 | 121 | $144.9M |
| Q3 2024 | 107 | $45.9M |
| Q2 2024 | 99 | $56.1M |
| Q1 2024 | 95 | $105.1M |
| Q4 2023 | 91 | $114.2M |
| Q3 2023 | 96 | $90.5M |
| Q2 2023 | 91 | $78.5M |
| Q1 2023 | 100 | $76.5M |
| Q4 2022 | 105 | $90.9M |
| Q3 2022 | 102 | $130.9M |
| Q2 2022 | 102 | $139.6M |
| Q1 2022 | 92 | $215.0M |
| Q4 2021 | 93 | $371.4M |
| Q3 2021 | 73 | $372.4M |
| Q2 2021 | 72 | $534.9M |
| Q1 2021 | 0 | $0 |
Institutions, Q2 2026
Shares, value and share of portfolio for each institution holding Quantum-Si Inc; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Vanguard Capital Management LLC | 7,578,208 | $6.71M | 0.00% | +556,301+7.9% | Added |
| ARK Investment Management LLCSuperinvestorARK Invest | 7,167,738 | $6.34M | 0.04% | +288,839+4.2% | Added |
| BlackRock, Inc. | 5,225,352 | $4.62M | 0.00% | −8,189,597−61.0% | Reduced |
| Nikko Asset Management Americas, Inc. | 3,885,230 | $3.46M | 0.04% | −506,436−11.5% | Reduced |
| Sumitomo Mitsui Trust Holdings, Inc. | 3,885,230 | $3.44M | 0.00% | −506,436−11.5% | Reduced |
| Millennium Management LLC | 3,131,726 | $2.77M | 0.00% | +3,131,726 | New |
| UBS Group AG | 2,561,897 | $2.27M | 0.00% | +859,370+50.5% | Added |
| AQR Capital Management LLC | 2,348,665 | $2.08M | 0.00% | −43,514−1.8% | Reduced |
| Geode Capital Management, LLC | 2,236,526 | $1.98M | 0.00% | −1,598,595−41.7% | Reduced |
| Jane Street Group, LLC | 2,142,735 | $1.90M | 0.00% | +2,142,735 | New |
| Susquehanna International Group, LLP | 1,116,750 | $988.3K | 0.00% | −347,818−23.7% | Reduced |
| Vanguard Fiduciary Trust Co | 1,116,683 | $988.3K | 0.00% | −569−0.1% | Reduced |
| State Street Corp | 890,741 | $788.3K | 0.00% | −2,879,948−76.4% | Reduced |
| Fosun International Ltd | 743,935 | $658.4K | 0.15% | 00.0% | Unchanged |
| Renaissance Technologies LLC | 553,871 | $490.2K | 0.00% | +435,971+369.8% | Added |
| Vanguard Portfolio Management LLC | 497,098 | $439.9K | 0.00% | −1,023,548−67.3% | Reduced |
| Goldman Sachs Group Inc | 476,288 | $421.5K | 0.00% | +32,111+7.2% | Added |
| Northern Trust Corp | 450,531 | $398.7K | 0.00% | −810,170−64.3% | Reduced |
| Invesco Ltd. | 443,929 | $392.9K | 0.00% | +37,239+9.2% | Added |
| BNP Paribas Arbitrage, SA | 398,598 | $352.8K | 0.00% | +360,208+938.3% | Added |
| Ieq Capital, LLC | 350,816 | $310.5K | 0.00% | −6,872−1.9% | Reduced |
| Aster Capital Management (DIFC) Ltd | 344,510 | $304.9K | 0.06% | +344,510 | New |
| Morgan Stanley | 323,482 | $286.3K | 0.00% | +193,542+148.9% | Added |
| Davy Global Fund Management Ltd | 321,134 | $284.2K | 0.02% | +29,027+9.9% | Added |
| Knollwood Investment Advisory, LLC | 300,000 | $265.5K | 0.02% | 00.0% | Unchanged |
| IMC-Chicago, LLC | 285,758 | $252.9K | 0.00% | +64,882+29.4% | Added |
| Bridgeway Capital Management, LLC | 206,100 | $182.4K | 0.00% | −55,000−21.1% | Reduced |
| Barclays PLC | 205,690 | $182.0K | 0.00% | +166,553+425.6% | Added |
| XTX Topco Ltd | 177,680 | $157.2K | 0.00% | −211,574−54.4% | Reduced |
| Simplex Trading, LLC | 165,293 | $146.3K | 0.00% | +74,762+82.6% | Added |
| Verdence Capital Advisors LLC | 158,305 | $140.1K | 0.01% | −45,550−22.3% | Reduced |
| Mariner, LLC | 157,689 | $139.6K | 0.00% | −42,003−21.0% | Reduced |
| Shay Capital LLC | 150,922 | $133.6K | 0.01% | 00.0% | Unchanged |
| FMR LLC | 123,767 | $109.5K | 0.00% | +91,799+287.2% | Added |
| Group One Trading, L.P. | 107,473 | $95.1K | 0.00% | −176,508−62.2% | Reduced |
| Jones Financial Companies LLLP | 100,483 | $85.8K | 0.00% | −9,417−8.6% | Reduced |
| HRT Financial LP | 93,647 | $82.0K | 0.00% | +93,647 | New |
| AlphaCore Capital LLC | 89,368 | $79.1K | 0.00% | −39,081−30.4% | Reduced |
| Cerity Partners LLC | 85,347 | $75.5K | 0.00% | +4,697+5.8% | Added |
| Vanguard Global Advisers, LLC | 84,757 | $75.0K | 0.00% | 00.0% | Unchanged |
| Charles Schwab Investment Management Inc | 84,612 | $74.9K | 0.00% | −372,959−81.5% | Reduced |
| Y-Intercept (Hong Kong) Ltd | 79,089 | $70.0K | 0.00% | +79,089 | New |
| JTC Employer Solutions Trusteee Ltd | 77,787 | $69.0K | 0.01% | +43,247+125.2% | Added |
| Mercer Global Advisors Inc | 77,277 | $68.4K | 0.00% | +22,082+40.0% | Added |
| Rhumbline Advisers | 75,989 | $67.2K | 0.00% | −117,079−60.6% | Reduced |
| Winton Group Ltd | 75,800 | $67.1K | 0.00% | +75,800 | New |
| Captrust Financial Advisors | 73,128 | $64.7K | 0.00% | +4,092+5.9% | Added |
| Hollencrest Capital Management | 65,011 | $57.5K | 0.00% | +24,900+62.1% | Added |
| Gsa Capital Partners LLP | 60,011 | $53.0K | 0.00% | +60,011 | New |
| Bank of America Corp | 59,585 | $52.7K | 0.00% | −102,402−63.2% | Reduced |
| Creative Planning | 55,884 | $49.5K | 0.00% | +3,336+6.3% | Added |
| Atom Investors LP | 51,554 | $45.6K | 0.00% | +51,554 | New |
| Wealth Enhancement Advisory Services, LLC | 63,435 | $45.2K | 0.00% | −26,101−29.2% | Reduced |
| Green Alpha Advisors, LLC | 45,921 | $40.6K | 0.03% | +2,713+6.3% | Added |
| Citadel Advisors LLC | 44,335 | $39.2K | 0.00% | +28,789+185.2% | Added |
| Sanctuary Advisors, LLC | 41,397 | $36.6K | 0.00% | −1,427−3.3% | Reduced |
| Stratos Wealth Advisors, LLC | 40,036 | $35.4K | 0.00% | +25,000+166.3% | Added |
| Point72 Asset Management, L.P. | 39,133 | $34.6K | 0.00% | +39,133 | New |
| Brighton Jones LLC | 38,585 | $34.1K | 0.00% | +11,025+40.0% | Added |
| CI Private Wealth, LLC | 38,328 | $33.9K | 0.00% | +38,328 | New |
| Cambridge Investment Research Advisors, Inc. | 37,809 | $33.0K | 0.00% | −4,000−9.6% | Reduced |
| Red Wave Investments LLC | 37,000 | $32.7K | 0.01% | 00.0% | Unchanged |
| SRS Capital Advisors, Inc. | 36,790 | $32.6K | 0.00% | +35,426+2,597.2% | Added |
| SBI Securities Co., Ltd. | 33,009 | $29.2K | 0.00% | +876+2.7% | Added |
| China Universal Asset Management Co., Ltd. | 31,484 | $27.9K | 0.00% | −3,218−9.3% | Reduced |
| Kovack Advisors, Inc. | 31,000 | $27.4K | 0.00% | +1,000+3.3% | Added |
| IPG Investment Advisors LLC | 30,864 | $27.3K | 0.00% | +30,864 | New |
| Nuveen, LLC | 30,077 | $26.6K | 0.00% | −421,290−93.3% | Reduced |
| Northern Lights Advisors, Inc. | 29,989 | $26.5K | 0.01% | 00.0% | Unchanged |
| Commonwealth Equity Services, LLC | 27,100 | $24.0K | 0.00% | −2,692−9.0% | Reduced |
| Wealth Management Associates, Inc. | 26,350 | $23.3K | 0.01% | −600−2.2% | Reduced |
| Tower Research Capital LLC (TRC) | 23,758 | $21.0K | 0.00% | −1,185−4.8% | Reduced |
| Merit Financial Group, LLC | 23,616 | $20.9K | 0.00% | −12,731−35.0% | Reduced |
| Pallas Capital Advisors LLC | 23,320 | $20.6K | 0.00% | −2,437−9.5% | Reduced |
| DLK Investment Management, LLC | 19,000 | $19.9K | 0.01% | +2,250+13.4% | Added |
| Leonteq Securities AG | 22,500 | $19.9K | 0.00% | −2,500−10.0% | Reduced |
| HBW Advisory Services LLC | 22,292 | $19.7K | 0.00% | −405−1.8% | Reduced |
| Neuberger Berman Group LLC | 21,766 | $19.3K | 0.00% | +21,766 | New |
| LPL Financial LLC | 20,985 | $18.6K | 0.00% | −1,482−6.6% | Reduced |
| JustInvest LLC | 20,350 | $18.0K | 0.00% | −3,641−15.2% | Reduced |
| Capital Investment Advisory Services, LLC | 20,000 | $17.7K | 0.00% | 00.0% | Unchanged |
| Victory Capital Management Inc | 19,630 | $17.4K | 0.00% | −178−0.9% | Reduced |
| Anchyra Partners LLC | 18,974 | $16.8K | 0.00% | +18,974 | New |
| Bank of New York Mellon Corp | 18,805 | $16.6K | 0.00% | −364,283−95.1% | Reduced |
| Colony Group, LLC | 17,219 | $15.2K | 0.00% | −6,298−26.8% | Reduced |
| JPMorgan Chase & Co | 17,071 | $15.2K | 0.00% | −66,448−79.6% | Reduced |
| SG Americas Securities, LLC | 17,505 | $15.0K | 0.00% | −16,172−48.0% | Reduced |
| Flagship Private Wealth, LLC | 14,158 | $12.5K | 0.00% | 00.0% | Unchanged |
| Procyon Private Wealth Partners, LLC | 13,671 | $12.1K | 0.00% | 00.0% | Unchanged |
| Balyasny Asset Management LLC | 13,629 | $12.1K | 0.00% | +13,629 | New |
| Raymond James Financial Inc | 13,008 | $11.5K | 0.00% | +13,008 | New |
| Laurion Capital Management LP | 12,749 | $11.3K | 0.00% | +12,749 | New |
| NorthCrest Asset Manangement, LLC | 11,218 | $10.8K | 0.00% | −926−7.6% | Reduced |
| Callan Family Office, LLC | 12,119 | $10.7K | 0.00% | +12,119 | New |
| Jefferies Financial Group Inc. | 11,350 | $10.0K | 0.00% | +11,350 | New |
| Integrated Wealth Concepts LLC | 11,333 | $10.0K | 0.00% | −3,166−21.8% | Reduced |
| GWM Advisors LLC | 11,168 | $9.88K | 0.00% | −4,652−29.4% | Reduced |
| Abel Hall, LLC | 11,060 | $9.79K | 0.00% | +11,060 | New |
| Krilogy Financial LLC | 10,635 | $9.41K | 0.00% | −6,094−36.4% | Reduced |
| Schonfeld Strategic Advisors LLC | 10,439 | $9.24K | 0.00% | +10,439 | New |