NASDAQ: QSIQuantum Si Inc Stock Ownership - Who owns Quantum Si?
Insider buying vs selling
Have Quantum Si Inc insiders been buying or selling?
Buy
Sell
| Name | Role | Date | Shares | Price | Value |
|---|---|---|---|---|---|
| John S. Vieceli | Chief Product Officer | 2025-12-22 | 21,927 | $1.28 | $27.98kSell |
| Jeffrey Alan Hawkins | President CEO | 2025-12-22 | 23,707 | $1.28 | $30.25kSell |
| Jeffry R. Keyes | Chief Financial Officer | 2025-12-22 | 8,627 | $1.28 | $11.01kSell |
| Christian Lapointe | GC Corp. Secretary | 2025-12-22 | 11,951 | $1.28 | $15.25kSell |
| Jonathan M. Rothberg | Director | 2025-10-16 | 26,095 | $3.07 | $80.11kSell |
| Jeffry R. Keyes | Chief Financial Officer | 2025-09-23 | 3,873 | $1.64 | $6.33kSell |
| John S. Vieceli | Chief Product Officer | 2025-09-23 | 9,843 | $1.64 | $16.09kSell |
| Todd C. Bennett | Chief Commercial Officer | 2025-09-23 | 18,482 | $1.64 | $30.22kSell |
| Jeffrey Alan Hawkins | President CEO | 2025-09-23 | 10,643 | $1.64 | $17.40kSell |
| Christian Lapointe | GC Corp. Secretary | 2025-09-23 | 5,364 | $1.64 | $8.77kSell |
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Net Insider Buy/Sell (L12M) Ownership
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QSI Shareholders
What type of owners hold Quantum Si Inc stock?
Institutional
Insider
Retail
| Name | Hold | Shares | Value | Type |
|---|---|---|---|---|
| Jonathan M. Rothberg | 23.56% | 50,765,194 | $64.47M | Insider |
| 4c Holdings I LLC | 8.33% | 17,943,750 | $22.79M | Insider |
| 2012 Jmr Trust Common LLC | 5.79% | 12,480,108 | $15.85M | Insider |
| Blackrock Inc | 5.25% | 11,321,673 | $14.38M | Institution |
| Vanguard Group Inc | 4.04% | 8,714,507 | $11.07M | Institution |
| James B. Tananbaum | 3.91% | 8,424,317 | $10.70M | Insider |
| Ark Investment Management LLC | 3.54% | 7,624,042 | $9.68M | Institution |
| Amova Asset Management Americas Inc | 2.42% | 5,217,499 | $6.63M | Institution |
| Sumitomo Mitsui Trust Group Inc | 2.42% | 5,217,499 | $6.63M | Institution |
| Geode Capital Management LLC | 1.74% | 3,747,169 | $4.76M | Institution |
QSI vs Biotech Stocks
Quantum Si Stock Ownership FAQ
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Information is provided 'as-is' and solely for informational purposes and is not advice. WallStreetZen does not bear any responsibility for any losses or damage that may occur as a result of reliance on this data.