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, Q1 2026
Institutional positions in Quantum-Si Inc as of Mar 31, 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
- 157
- +24 vs. Q4 2025
- Shares held
- 63.1M
- +5.24M (+9.0%) vs. Q4 2025
- Total value
- $49.0M
- −$14.8M (−23.2%) vs. Q4 2025
- New holders
- 45
- 39 more added
- Sold out
- 21
- 37 more reduced
2 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 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, Q1 2026
Shares, value and share of portfolio for each institution holding Quantum-Si Inc; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Royal Bank of Canada | 109 | $0 | 0.00% | −4,358−97.6% | Reduced |
| Kilter Group LLC | 4 | $4 | 0.00% | +4 | New |
| Federation des caisses Desjardins du Quebec | 50 | $39 | 0.00% | 00.0% | Unchanged |
| Bangor Savings Bank | 105 | $81 | 0.00% | +105 | New |
| SJS Investment Consulting Inc. | 119 | $93 | 0.00% | +119 | New |
| Sunbelt Securities, Inc. | 143 | $111 | 0.00% | +143 | New |
| Gill Capital Partners, LLC | 200 | $155 | 0.00% | +200 | New |
| Harbour Investments, Inc. | 250 | $194 | 0.00% | +250 | New |
| TD Waterhouse Canada Inc. | 300 | $224 | 0.00% | −500−62.5% | Reduced |
| Root Financial Partners, LLC | 292 | $226 | 0.00% | +292 | New |
| Caitong International Asset Management Co., Ltd | 305 | $236 | 0.00% | −37,659−99.2% | Reduced |
| Walleye Capital LLC | 312 | $241 | 0.00% | +254+437.9% | Added |
| Nisa Investment Advisors, LLC | 382 | $296 | 0.00% | −226−37.2% | Reduced |
| Walleye Trading LLC | 448 | $347 | 0.00% | +448 | New |
| Medallion Wealth Advisors, LLC | 470 | $363 | 0.00% | 00.0% | Unchanged |
| True Wealth Design, LLC | 507 | $393 | 0.00% | +507 | New |
| Rialto Wealth Management, LLC | 509 | $394 | 0.00% | +509 | New |
| Wealth Preservation Advisors, LLC | 549 | $425 | 0.00% | +549 | New |
| Optiver Holding B.V. | 806 | $624 | 0.00% | −121−13.1% | Reduced |
| Sound Income Strategies, LLC | 1,000 | $748 | 0.00% | 00.0% | Unchanged |
| MAI Capital Management | 1,274 | $987 | 0.00% | +1,274 | New |
| Farther Finance Advisors, LLC | 1,334 | $997 | 0.00% | +1,334 | New |
| Hanson & Doremus Investment Management | 1,300 | $1.00K | 0.00% | +1,300 | New |
| SRS Capital Advisors, Inc. | 1,364 | $1.06K | 0.00% | +1,364 | New |
| Rothschild Investment LLC | 1,688 | $1.31K | 0.00% | +1,618+2,311.4% | Added |
| GAMMA Investing LLC | 1,830 | $1.42K | 0.00% | −5,161−73.8% | Reduced |
| Archer Investment Corp | 2,000 | $1.55K | 0.00% | 00.0% | Unchanged |
| Steward Partners Investment Advisory, LLC | 2,000 | $1.55K | 0.00% | +2,000 | New |
| IFP Advisors, Inc | 2,101 | $1.63K | 0.00% | +2,101 | New |
| Pinney & Scofield, Inc. | 3,680 | $2.85K | 0.00% | 00.0% | Unchanged |
| GF Fund Management Co. Ltd. | 3,723 | $2.88K | 0.00% | 00.0% | Unchanged |
| N.E.W. Advisory Services LLC | 3,854 | $2.98K | 0.00% | 00.0% | Unchanged |
| FNY Investment Advisers, LLC | 4,000 | $3.00K | 0.00% | 00.0% | Unchanged |
| MTM Investment Management, LLC | 4,125 | $3.19K | 0.00% | 00.0% | Unchanged |
| Ronald Blue Trust, Inc. | 5,000 | $3.87K | 0.00% | 00.0% | Unchanged |
| EverSource Wealth Advisors, LLC | 5,455 | $4.22K | 0.00% | +5,028+1,177.5% | Added |
| Sterling Capital Management LLC | 5,672 | $4.39K | 0.00% | −3,382−37.4% | Reduced |
| Wolverine Asset Management LLC | 6,170 | $4.78K | 0.00% | 00.0% | Unchanged |
| Allworth Financial LP | 6,829 | $5.29K | 0.00% | +6,393+1,466.3% | Added |
| Advisor Group Holdings, Inc. | 7,970 | $6.14K | 0.00% | +869+12.2% | Added |
| California State Teachers Retirement System | 8,500 | $6.58K | 0.00% | −1,161−12.0% | Reduced |
| Glen Eagle Advisors, LLC | 10,000 | $7.74K | 0.00% | 00.0% | Unchanged |
| Red Reef Advisors LLC | 10,000 | $7.74K | 0.01% | 00.0% | Unchanged |
| Kestra Private Wealth Services, LLC | 10,000 | $7.74K | 0.00% | +10,000 | New |
| Ground Swell Capital, LLC | 10,132 | $7.84K | 0.02% | +10,132 | New |
| Mirae Asset Global Investments Co., Ltd. | 10,200 | $7.89K | 0.00% | +697+7.3% | Added |
| Cresset Asset Management, LLC | 10,207 | $7.90K | 0.00% | 00.0% | Unchanged |
| RMB Capital Management, LLC | 10,391 | $8.04K | 0.00% | +10,391 | New |
| NorthCrest Asset Manangement, LLC | 12,144 | $9.08K | 0.00% | +12,144 | New |
| Russell Investments Group, Ltd. | 11,848 | $9.17K | 0.00% | −15,045−55.9% | Reduced |
| Graham Capital Management, L.P. | 12,220 | $9.46K | 0.00% | −2,202−15.3% | Reduced |
| Legal & General Group Plc | 12,860 | $9.95K | 0.00% | 00.0% | Unchanged |
| Citigroup Inc | 13,314 | $10.3K | 0.00% | −6,462−32.7% | Reduced |
| Procyon Private Wealth Partners, LLC | 13,671 | $10.6K | 0.00% | 00.0% | Unchanged |
| Xponance, Inc. | 13,849 | $10.7K | 0.00% | +2,025+17.1% | Added |
| Flagship Private Wealth, LLC | 14,158 | $11.0K | 0.00% | 00.0% | Unchanged |
| Ameritas Investment Partners, Inc. | 14,401 | $11.1K | 0.00% | 00.0% | Unchanged |
| Integrated Wealth Concepts LLC | 14,499 | $11.2K | 0.00% | +14,499 | New |
| Stratos Wealth Advisors, LLC | 15,036 | $11.6K | 0.00% | 00.0% | Unchanged |
| Essential Partners LLC | 15,436 | $11.9K | 0.00% | +15,436 | New |
| Citadel Advisors LLC | 15,546 | $12.0K | 0.00% | −2,660,551−99.4% | Reduced |
| GWM Advisors LLC | 15,820 | $12.2K | 0.00% | +1,778+12.7% | Added |
| Buckingham Strategic Partners | 16,473 | $12.8K | 0.00% | +16,473 | New |
| DLK Investment Management, LLC | 16,750 | $13.0K | 0.01% | +16,750 | New |
| Victory Capital Management Inc | 19,808 | $15.3K | 0.00% | +11+0.1% | Added |
| Capital Investment Advisory Services, LLC | 20,000 | $15.5K | 0.00% | 00.0% | Unchanged |
| Prudential Financial Inc | 21,570 | $16.7K | 0.00% | +21,570 | New |
| LPL Financial LLC | 22,467 | $17.4K | 0.00% | −2,750−10.9% | Reduced |
| Krilogy Financial LLC | 16,729 | $17.4K | 0.00% | +16,729 | New |
| HBW Advisory Services LLC | 22,697 | $17.6K | 0.00% | −1,466−6.1% | Reduced |
| Colony Group, LLC | 23,517 | $18.2K | 0.00% | +23,517 | New |
| JustInvest LLC | 23,991 | $18.6K | 0.00% | +192+0.8% | Added |
| Tower Research Capital LLC (TRC) | 24,943 | $19.3K | 0.00% | −7,652−23.5% | Reduced |
| Leonteq Securities AG | 25,000 | $19.4K | 0.00% | 00.0% | Unchanged |
| Kovack Advisors, Inc. | 30,000 | $19.7K | 0.00% | +13,200+78.6% | Added |
| Pallas Capital Advisors LLC | 25,757 | $19.9K | 0.00% | +25,757 | New |
| New York State Common Retirement Fund | 26,084 | $20.2K | 0.00% | 00.0% | Unchanged |
| Wealth Management Associates, Inc. | 26,950 | $20.9K | 0.01% | 00.0% | Unchanged |
| Voya Investment Management LLC | 27,246 | $21.1K | 0.00% | 00.0% | Unchanged |
| Brighton Jones LLC | 27,560 | $21.3K | 0.00% | +27,560 | New |
| Commonwealth Equity Services, LLC | 29,792 | $23.1K | 0.00% | +1,832+6.6% | Added |
| Northern Lights Advisors, Inc. | 29,989 | $23.2K | 0.02% | 00.0% | Unchanged |
| FMR LLC | 31,968 | $24.7K | 0.00% | −65,957−67.4% | Reduced |
| SBI Securities Co., Ltd. | 32,133 | $24.9K | 0.00% | −2,030−5.9% | Reduced |
| SEI Investments Co | 33,103 | $25.6K | 0.00% | 00.0% | Unchanged |
| ProShare Advisors LLC | 33,239 | $25.7K | 0.00% | −4,102−11.0% | Reduced |
| SG Americas Securities, LLC | 33,677 | $26.0K | 0.00% | +4,571+15.7% | Added |
| China Universal Asset Management Co., Ltd. | 34,702 | $26.9K | 0.00% | +2,837+8.9% | Added |
| JTC Employer Solutions Trusteee Ltd | 34,540 | $27.0K | 0.00% | 00.0% | Unchanged |
| Merit Financial Group, LLC | 36,347 | $28.1K | 0.00% | +36,347 | New |
| Red Wave Investments LLC | 37,000 | $28.6K | 0.01% | 00.0% | Unchanged |
| BNP Paribas Arbitrage, SA | 38,390 | $29.7K | 0.00% | +2,114+5.8% | Added |
| Barclays PLC | 39,137 | $30.3K | 0.00% | −230,278−85.5% | Reduced |
| Hollencrest Capital Management | 40,111 | $31.0K | 0.00% | +30,111+301.1% | Added |
| Nine Masts Capital Ltd | 41,134 | $31.8K | 0.00% | +41,134 | New |
| State Board of Administration of Florida Retirement System | 41,282 | $32.0K | 0.00% | 00.0% | Unchanged |
| Cambridge Investment Research Advisors, Inc. | 41,809 | $32.0K | 0.00% | +4,042+10.7% | Added |
| Sanctuary Advisors, LLC | 42,824 | $33.1K | 0.00% | +411+1.0% | Added |
| Green Alpha Advisors, LLC | 43,208 | $33.4K | 0.03% | −8,320−16.1% | Reduced |
| Police & Firemen's Retirement System of New Jersey | 46,170 | $35.7K | 0.00% | 00.0% | Unchanged |