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 2025
Institutional positions in Quantum-Si Inc as of Jun 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
- 135
- −1 vs. Q1 2025
- Shares held
- 64.4M
- +6.66M (+11.5%) vs. Q1 2025
- Total value
- $126.2M
- +$56.9M (+82.3%) vs. Q1 2025
- New holders
- 15
- 56 more added
- Sold out
- 16
- 35 more reduced
1 institution that held it in Q1 2025 haven't filed for Q2 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q1 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, Q2 2025
Shares, value and share of portfolio for each institution holding Quantum-Si Inc; share changes are against Q1 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| AQR Capital Management LLC | 121,703 | $238.5K | 0.00% | +25,661+26.7% | Added |
| Shay Capital LLC | 129,631 | $254.1K | 0.06% | +1,131+0.9% | Added |
| Group One Trading, L.P. | 134,632 | $263.9K | 0.01% | +134,632 | New |
| Invesco Ltd. | 195,450 | $383.1K | 0.00% | +91,793+88.6% | Added |
| Bridgeway Capital Management, LLC | 196,100 | $384.4K | 0.01% | 00.0% | Unchanged |
| Pathstone Holdings, LLC | 198,798 | $389.6K | 0.00% | −15,511−7.2% | Reduced |
| Rhumbline Advisers | 203,967 | $399.8K | 0.00% | +53,994+36.0% | Added |
| Ameriprise Financial Inc | 223,100 | $437.3K | 0.00% | +223,100 | New |
| Green Alpha Advisors, LLC | 228,348 | $447.6K | 0.43% | −15,719−6.4% | Reduced |
| Barclays PLC | 239,001 | $468.4K | 0.00% | +118,113+97.7% | Added |
| Alliancebernstein L.P. | 272,180 | $533.5K | 0.00% | +162,000+147.0% | Added |
| Gsa Capital Partners LLP | 284,363 | $557.0K | 0.04% | +38,171+15.5% | Added |
| Jane Street Group, LLC | 284,753 | $558.1K | 0.00% | +284,753 | New |
| Morgan Stanley | 289,913 | $568.2K | 0.00% | +2,425+0.8% | Added |
| Knollwood Investment Advisory, LLC | 300,000 | $588.0K | 0.06% | 00.0% | Unchanged |
| Bank of New York Mellon Corp | 352,732 | $691.4K | 0.00% | +57,826+19.6% | Added |
| Charles Schwab Investment Management Inc | 431,447 | $845.6K | 0.00% | +64,003+17.4% | Added |
| Royal Bank of Canada | 460,289 | $902.0K | 0.00% | +446,860+3,327.6% | Added |
| Bank of America Corp | 465,999 | $913.4K | 0.00% | +377,504+426.6% | Added |
| Citadel Advisors LLC | 558,307 | $1.09M | 0.00% | +419,809+303.1% | Added |
| Two Sigma Investments, LP | 564,442 | $1.11M | 0.00% | −252,533−30.9% | Reduced |
| Fosun International Ltd | 743,935 | $1.46M | 0.46% | 00.0% | Unchanged |
| UBS Group AG | 789,570 | $1.55M | 0.00% | +339,888+75.6% | Added |
| Goldman Sachs Group Inc | 894,100 | $1.75M | 0.00% | +452,786+102.6% | Added |
| Susquehanna International Group, LLP | 986,084 | $1.93M | 0.00% | +189,154+23.7% | Added |
| Nuveen, LLC | 1,126,084 | $2.21M | 0.00% | +806,984+252.9% | Added |
| Northern Trust Corp | 2,289,456 | $4.49M | 0.00% | +1,267,338+124.0% | Added |
| State Street Corp | 2,756,437 | $5.40M | 0.00% | +302,331+12.3% | Added |
| Geode Capital Management, LLC | 3,447,738 | $6.76M | 0.00% | +452,850+15.1% | Added |
| Millennium Management LLC | 3,779,259 | $7.41M | 0.01% | −155,026−3.9% | Reduced |
| Sumitomo Mitsui Trust Holdings, Inc. | 5,621,303 | $11.0M | 0.01% | −190,127−3.3% | Reduced |
| Nikko Asset Management Americas, Inc. | 5,621,303 | $11.0M | 0.11% | −190,127−3.3% | Reduced |
| ARK Investment Management LLCSuperinvestorARK Invest | 7,960,736 | $15.6M | 0.11% | −752,765−8.6% | Reduced |
| Vanguard Group Inc | 8,669,661 | $17.0M | 0.00% | +1,776,799+25.8% | Added |
| BlackRock, Inc. | 10,848,142 | $21.3M | 0.00% | +1,407,899+14.9% | Added |
| Guggenheim Capital LLC | 0 | $0 | 0.00% | −129,021−100.0% | Sold out |
| Two Sigma Advisers, LP | 0 | $0 | 0.00% | −78,900−100.0% | Sold out |
| Corebridge Financial, Inc. | 0 | $0 | 0.00% | −58,876−100.0% | Sold out |
| Virtu Financial LLC | 0 | $0 | 0.00% | −34,830−100.0% | Sold out |
| WestHill Financial Advisors, Inc. | 0 | $0 | 0.00% | −21,727−100.0% | Sold out |
| Dash Acquisitions Inc. | 0 | $0 | 0.00% | −10,000−100.0% | Sold out |
| Abel Hall, LLC | 0 | $0 | 0.00% | −12,008−100.0% | Sold out |
| Thoroughbred Financial Services, LLC | 0 | $0 | 0.00% | −12,000−100.0% | Sold out |
| Eqis Capital Management, Inc. | 0 | $0 | 0.00% | −11,051−100.0% | Sold out |
| SIH Partners, LLLP | 0 | $0 | 0.00% | −10,624−100.0% | Sold out |
| Ballew Advisors, Inc | 0 | $0 | 0.00% | −10,000−100.0% | Sold out |
| CIBC Private Wealth Group, LLC | 0 | $0 | 0.00% | −10,000−100.0% | Sold out |
| CoreCap Advisors, LLC | 0 | $0 | 0.00% | −1,748−100.0% | Sold out |
| UMA Financial Services, Inc. | 0 | $0 | 0.00% | −687−100.0% | Sold out |
| American Capital Advisory, LLC | 0 | $0 | 0.00% | −100−100.0% | Sold out |
| True Wealth Design, LLC | 0 | $0 | 0.00% | −2−100.0% | Sold out |
| Callan Capital, LLC | – | – | – | – | Not filed |