Who owns QUANTUM SI INC?
- Ticker: QSI
- CUSIP Number: 74765k105
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Analyze quarterly positions in Quantum Si with up to 7 years of data, all consolidated into one spreadsheet
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Top investors of Quantum Si stock
Who bought or sold QUANTUM SI INC this quarter?
| Fund or Company Name | Shares Held | Valued At | Change in Shares | As Of | Actions |
|---|---|---|---|---|---|
| BlackRock | 13M | $10M | 3% | Mar 2026 |
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| Vanguard Group | 9.6M | $11M | 10% | Dec 2025 |
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| Vanguard Capital Management | 7.0M | $5.4M | 100% | Mar 2026 |
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| ARK Investment Management | 6.9M | $5.3M | -2% | Mar 2026 |
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| Sumitomo Mitsui Trust Holdings | 4.4M | $3.4M | -6% | Mar 2026 |
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| Nikko Asset Management Americas | 4.4M | $3.4M | -6% | Mar 2026 |
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| Geode Capital Management | 3.8M | $3.0M | -7% | Mar 2026 |
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| State Street Corporation | 3.6M | $3.9M | 26% | Dec 2025 |
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| Susquehanna International | 2.9M | $3.1M | 14% | Dec 2025 |
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| AQR Capital Management | 2.4M | $1.9M | 2659% | Mar 2026 |
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| Northern Trust | 2.2M | $2.4M | -5% | Dec 2025 |
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| UBS Group | 1.7M | $1.3M | 17% | Mar 2026 |
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| Vanguard Portfolio Management | 1.5M | $1.2M | 100% | Mar 2026 |
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| Vanguard Fiduciary Trust | 1.1M | $865k | 100% | Mar 2026 |
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| Fosun International | 744k | $576k | 0% | Mar 2026 |
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| Charles Schwab Investment Management | 468k | $515k | 0% | Dec 2025 |
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| XTX Topco | 462k | $508k | 207% | Dec 2025 |
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| Nuveen | 451k | $349k | 1% | Mar 2026 |
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| Goldman Sachs Group | 444k | $344k | 15% | Mar 2026 |
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| Invesco | 407k | $315k | 1% | Mar 2026 |
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| Bank of New York Mellon | 383k | $297k | -6% | Mar 2026 |
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| Knollwood Investment Advisory | 300k | $232k | 0% | Mar 2026 |
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| Davy Asset Management | 292k | $226k | 15% | Mar 2026 |
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| Group One Trading | 284k | $220k | 16% | Mar 2026 |
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| Jane Street | 283k | $219k | -80% | Mar 2026 |
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| Quadrature Capital | 277k | $305k | 100% | Dec 2025 |
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| Alliancebernstein | 272k | $299k | 0% | Mar 2026 |
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| Barclays | 269k | $296k | 22% | Dec 2025 |
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| Bridgeway Capital Management | 261k | $287k | 0% | Dec 2025 |
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| Virtu Financial | 238k | $262k | 100% | Dec 2025 |
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| IMC-Chicago | 221k | $171k | 100% | Mar 2026 |
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| Citadel Advisors | 220k | $170k | -94% | Mar 2026 |
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| CIBC Bancorp USA | 209k | $161k | 1145% | Mar 2026 |
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| Verdence Capital Advisors | 204k | $158k | 9% | Mar 2026 |
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| Mariner Wealth Advisors | 200k | $155k | 251% | Mar 2026 |
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| Rhumbline Advisers | 193k | $149k | 0% | Mar 2026 |
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| Bank of America Corporation | 162k | $125k | 100% | Mar 2026 |
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| Shay Capital | 151k | $117k | 100% | Mar 2026 |
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| Morgan Stanley | 130k | $101k | -68% | Mar 2026 |
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| AlphaCore Capital | 128k | $99k | 160% | Mar 2026 |
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| Deutsche Bank Aktiengesellschaft | 119k | $92k | 0% | Mar 2026 |
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| Thomas Stevens, CFA" | 116k | $90k | 25% | Mar 2026 |
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| Jones Financial Companies, L.L | 99k | $109k | 6% | Dec 2025 |
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| FMR | 98k | $108k | 8% | Dec 2025 |
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| Vanguard Global Advisers | 85k | $66k | 100% | Mar 2026 |
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| HPM Partners | 81k | $62k | 100% | Mar 2026 |
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| Simplex Trading | 81k | $89k | -48% | Dec 2025 |
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| Mirae Asset Global Etfs Holdings | 75k | $58k | 3% | Mar 2026 |
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| Wells Fargo & Company | 64k | $49k | -64% | Mar 2026 |
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| Quantbot Technologies | 59k | $45k | 100% | Mar 2026 |
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| Mercer Global Advisors | 55k | $43k | 100% | Mar 2026 |
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| Two Sigma Investments | 53k | $41k | -96% | Mar 2026 |
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| Creative Planning | 53k | $41k | 100% | Mar 2026 |
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| Manufacturers Life Insurance Company | 48k | $37k | -2% | Mar 2026 |
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| Intech Investment Management | 47k | $36k | -29% | Mar 2026 |
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| Police & Firemen's Retirement System of New Jersey | 46k | $36k | 0% | Mar 2026 |
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| Green Alpha Advisors | 43k | $33k | -16% | Mar 2026 |
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| Sanctuary Advisors | 43k | $33k | 1% | Mar 2026 |
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| Cambridge Investment Research Advisors | 42k | $32k | 11% | Mar 2026 |
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| Florida State Board of Administration | 41k | $32k | 0% | Mar 2026 |
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| Nine Masts Capital | 41k | $32k | 100% | Mar 2026 |
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| Hollencrest Securities | 40k | $31k | 301% | Mar 2026 |
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| Bnp Paribas Arbitrage, Snc | 38k | $30k | 6% | Mar 2026 |
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| Red Wave Investments | 37k | $29k | 0% | Mar 2026 |
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| Merit Financial Group | 36k | $28k | 100% | Mar 2026 |
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| China Universal Asset Management | 35k | $27k | 9% | Mar 2026 |
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| Captrust Financial Advisors | 35k | $38k | -1% | Dec 2025 |
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| JTC Employer Solutions Trustee | 35k | $27k | 0% | Mar 2026 |
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| MetLife Investment Advisors | 34k | $38k | -47% | Dec 2025 |
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| SG Americas Securities | 34k | $26k | 16% | Mar 2026 |
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| ProShare Advisors | 33k | $26k | -11% | Mar 2026 |
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| Sei Investments | 33k | $26k | 0% | Mar 2026 |
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| Tower Research Capital | 33k | $36k | 122% | Dec 2025 |
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| SBI Securities | 32k | $25k | -6% | Mar 2026 |
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| Kovack Advisors | 30k | $20k | 79% | Mar 2026 |
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| Northern Lights Advisors | 30k | $23k | 0% | Mar 2026 |
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| Commonwealth Equity Services | 30k | $23k | 7% | Mar 2026 |
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| Ing Investment Management | 27k | $21k | 0% | Mar 2026 |
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| Wealth Management Associates | 27k | $21k | 0% | Mar 2026 |
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| Neuberger Berman Group | 27k | $30k | 100% | Dec 2025 |
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| New York State Common Retirement Fund | 26k | $20k | 0% | Mar 2026 |
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| Pallas Capital Advisors | 26k | $20k | 100% | Mar 2026 |
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| Leonteq Securities | 25k | $19k | 0% | Mar 2026 |
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| JustInvest | 24k | $19k | 1% | Mar 2026 |
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| Walleye Trading Advisors | 24k | $19k | 1% | Mar 2026 |
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| HBW Advisory Services | 23k | $18k | -6% | Mar 2026 |
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| LPL Financial | 23k | $17k | -11% | Mar 2026 |
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| Walleye Trading | 22k | $17k | 2% | Mar 2026 |
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| Atom Investors | 22k | $24k | 100% | Dec 2025 |
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| Prudential Financial | 22k | $17k | 100% | Mar 2026 |
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| Capital Investment Advisory Services | 20k | $16k | 0% | Mar 2026 |
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| Victory Capital Management | 20k | $22k | 13% | Dec 2025 |
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| Blueshift Asset Management | 17k | $19k | 100% | Dec 2025 |
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| DLK Investment Management | 17k | $13k | 100% | Mar 2026 |
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| Krilogy Financial | 17k | $17k | 100% | Mar 2026 |
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| Buckingham Strategic Partners | 17k | $13k | 100% | Mar 2026 |
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| Goss Wealth Management | 16k | $12k | 13% | Mar 2026 |
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| Essential Partners | 15k | $12k | 100% | Mar 2026 |
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| Stratos Wealth Advisors | 15k | $12k | 0% | Mar 2026 |
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| Integrated Wealth Concepts | 15k | $11k | 100% | Mar 2026 |
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| Summit Investment Advisors | 14k | $11k | 0% | Mar 2026 |
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| Flagship Private Wealth | 14k | $11k | 0% | Mar 2026 |
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| Fis | 14k | $11k | 17% | Mar 2026 |
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| Procyon Private Wealth Partners | 14k | $11k | 0% | Mar 2026 |
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| Citigroup | 13k | $10k | 100% | Mar 2026 |
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| Legal & General Group | 13k | $10k | 0% | Mar 2026 |
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| Graham Capital Management | 12k | $9.5k | -15% | Mar 2026 |
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| NorthCrest Asset Manangement | 12k | $9.1k | 100% | Mar 2026 |
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| Russell Investments | 12k | $9.2k | -56% | Mar 2026 |
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| Cibc World Markets | 10k | $11k | 100% | Dec 2025 |
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| RMB Capital Management | 10k | $8.0k | 100% | Mar 2026 |
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| Cresset Asset Management | 10k | $7.9k | 0% | Mar 2026 |
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| Mirae Asset Global Investments | 10k | $7.9k | 7% | Mar 2026 |
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| Ground Swell Capital | 10k | $7.8k | 100% | Mar 2026 |
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| Kestra Private Wealth Services | 10k | $7.7k | 100% | Mar 2026 |
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| Red Reef Advisors | 10k | $7.7k | 0% | Mar 2026 |
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| Glen Eagle Advisors | 10k | $7.7k | 0% | Mar 2026 |
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| California State Teachers Retirement System | 8.5k | $6.6k | -12% | Mar 2026 |
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| Advisor Group Holdings | 7.1k | $7.8k | 482% | Dec 2025 |
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| CWM | 7.0k | $8.0k | 224% | Dec 2025 |
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| Wolverine Asset Management | 6.2k | $4.8k | 0% | Mar 2026 |
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| Sterling Capital Management | 5.7k | $4.4k | -37% | Mar 2026 |
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| EverSource Wealth Advisors | 5.5k | $4.2k | 1178% | Mar 2026 |
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| Ronald Blue Trust | 5.0k | $3.9k | 0% | Mar 2026 |
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| Tucker Asset Management | 4.7k | $5.2k | 100% | Dec 2025 |
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| MTM Investment Management | 4.1k | $3.2k | 0% | Mar 2026 |
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| FNY Investment Advisers | 4.0k | $3.0k | 0% | Mar 2026 |
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| N.E.W. Advisory Services | 3.9k | $3.0k | 0% | Mar 2026 |
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| Gf Fund Management | 3.7k | $2.9k | 0% | Mar 2026 |
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| Pinney & Scofield | 3.7k | $2.8k | 0% | Mar 2026 |
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| IFP Advisors | 2.1k | $1.6k | 100% | Mar 2026 |
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| Archer Investment Corp | 2.0k | $1.5k | 0% | Mar 2026 |
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| Steward Partners Investment Advisory | 2.0k | $1.5k | 100% | Mar 2026 |
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| GAMMA Investing | 1.8k | $1.4k | -74% | Mar 2026 |
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| Rothschild Investment | 1.7k | $1.3k | 2311% | Mar 2026 |
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| SRS Capital Advisors | 1.4k | $1.1k | 100% | Mar 2026 |
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| Farther Finance Advisors | 1.3k | $997.031600 | 100% | Mar 2026 |
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| Hanson & Doremus Investment Management | 1.3k | $999.960000 | 100% | Mar 2026 |
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| MAI Wealth Advisors | 1.3k | $986.967800 | 100% | Mar 2026 |
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| Sound Income Strategies | 1.0k | $748.000000 | 0% | Mar 2026 |
|
| Optiver Holding B.V. | 806.00 | $624.005200 | -13% | Mar 2026 |
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| Wealth Preservation Advisors | 549.00 | $424.980900 | 100% | Mar 2026 |
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| True Wealth Design | 507.00 | $392.975700 | 100% | Mar 2026 |
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| Medallion Wealth Advisors | 470.00 | $362.793000 | 0% | Mar 2026 |
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| Hanson McClain Advisors | 436.00 | $479.992400 | -49% | Dec 2025 |
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| NISA Investment Advisors | 382.00 | $296.011800 | -37% | Mar 2026 |
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| Caitong International Asset Management | 305.00 | $236.009000 | -99% | Mar 2026 |
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| TD Waterhouse Canada | 300.00 | $224.010000 | -62% | Mar 2026 |
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| Root Financial Partners | 292.00 | $226.008000 | 100% | Mar 2026 |
|
| Harbour Investments | 250.00 | $194.000000 | 100% | Mar 2026 |
|
| Royal Bank of Canada | 109.00 | $0 | -100% | Mar 2026 |
|
Who sold out of Quantum Si?
| Fund or Company Name | Date Sold | Shares Held | Valued At |
|---|---|---|---|
| Millennium Management | Dec 2025 | 192k | $211k |
| None | Dec 2025 | 149k | $164k |
| Hrt Financial | Dec 2025 | 104k | $114k |
| Jpmorgan Chase & Co | Sep 2025 | 63k | $89k |
| Scientech Research | Dec 2025 | 46k | $51k |
| Engineers Gate Manager | Sep 2025 | 42k | $58k |
| Peak6 | Dec 2025 | 38k | $42k |
| Dimensional Fund Advisors | Dec 2025 | 31k | $35k |
| Curbstone Financial Management | Dec 2025 | 24k | $26k |
| Balyasny Asset Management | Dec 2025 | 19k | $21k |
| Jump Financial | Sep 2025 | 15k | $21k |
| Belvedere Trading | Dec 2025 | 15k | $16k |
| Ewa | Dec 2025 | 14k | $15k |
| McAdam | Dec 2025 | 12k | $14k |
| State of Wyoming | Dec 2025 | 11k | $12k |
| Kestra Advisory Services | Dec 2025 | 10k | $11k |
| Amalgamated Bank | Dec 2025 | 4.9k | $5.0k |
| Signature Resources Capital Management | Dec 2025 | 1.0k | $1.1k |