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 | 2026-03-23 | 11,239 | $0.83 | $9.29kSell |
| Jeffrey Alan Hawkins | President CEO | 2026-03-23 | 12,149 | $0.83 | $10.05kSell |
| Jeffry R. Keyes | Chief Financial Officer | 2026-03-23 | 4,422 | $0.83 | $3.66kSell |
| Christian Lapointe | GC Corp. Secretary | 2026-03-23 | 6,110 | $0.83 | $5.05kSell |
| Jeffrey Alan Hawkins | President CEO | 2026-03-20 | 11,628 | $0.85 | $9.86kSell |
| John S. Vieceli | Chief Product Officer | 2026-03-20 | 10,758 | $0.85 | $9.12kSell |
| Christian Lapointe | GC Corp. Secretary | 2026-03-20 | 5,849 | $0.85 | $4.96kSell |
| Jeffry R. Keyes | Chief Financial Officer | 2026-03-20 | 4,233 | $0.85 | $3.59kSell |
| Paula Dowdy | Director | 2026-03-05 | 109,890 | $0.95 | $104.51kBuy |
| Charles R. Kummeth | Director | 2026-03-05 | 500,000 | $0.92 | $460.00kBuy |
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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 | 23.46% | 50,765,194 | $42.69M | Insider |
| 4c Holdings I LLC | 8.29% | 17,943,750 | $15.09M | Insider |
| Blackrock Inc | 6.03% | 13,054,057 | $10.98M | Institution |
| 2012 Jmr Trust Common LLC | 5.77% | 12,480,108 | $10.50M | Insider |
| Vanguard Group Inc | 4.44% | 9,607,022 | $8.08M | Institution |
| James B. Tananbaum | 3.89% | 8,424,317 | $7.08M | Insider |
| Ark Investment Management LLC | 3.25% | 7,021,571 | $5.91M | Institution |
| Sumitomo Mitsui Trust Group Inc | 2.17% | 4,690,720 | $3.94M | Institution |
| Amova Asset Management Americas Inc | 2.17% | 4,690,720 | $3.94M | Institution |
| Geode Capital Management LLC | 1.90% | 4,114,375 | $3.46M | Institution |
QSI vs Biotech Stocks
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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.
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.