🕵️ Quantum-Si Inc ($QSI)
SEC insider & ownership activity, last 12 months · CIK 1816431 · every row links its SEC filing
Over the last 12 months insiders sold $694K against $564K of open-market buying. Charles R. Kummeth bought $460K in discretionary trades (Mar). ARK Investment Management LLC trimmed 9.7% → 7.2%. One red-flag 8-K in the window: Delisting notice (3.01), Jul 23, 2026.
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Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
2 buyers, $564K (2 lots) · 6 sellers, $694K (35 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Charles R. Kummeth | 1 | $460K | 0 | – | Mar 5, 2026 |
| Hawkins Jeffrey Alan | 0 | – | 9 | $274K | Jun 23, 2026 |
| Jeffry R. Keyes | 0 | – | 9 | $114K | Jun 23, 2026 |
| John S. Vieceli | 0 | – | 7 | $107K | Jun 23, 2026 |
| Dowdy Paula | 1 | $104K | 0 | – | Mar 5, 2026 |
| Jonathan M. Rothberg | 0 | – | 1 | $80K | Oct 16, 2025 |
| Todd C. Bennett | 0 | – | 2 | $61K | Sep 23, 2025 |
| Lapointe Christian | 0 | – | 7 | $58K | Jun 23, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Jonathan M. Rothberg | 100.0% | 13D | Sep 9, 2025 | filing ↗ | |
| Jonathan M. Rothberg | 100.0% | Class A | 13D | Dec 27, 2024 | filing ↗ |
| 4C Holdings I, LLC | 90.0% | 13D | Sep 9, 2025 | filing ↗ | |
| 4C Holdings I, LLC | 90.0% | Class A | 13D | Dec 27, 2024 | filing ↗ |
| Jonathan M. Rothberg | 11.5% | Class A | 13D | Dec 27, 2024 | filing ↗ |
| 4C Holdings V, LLC | 10.0% | 13D | Sep 9, 2025 | filing ↗ | |
| 4C Holdings V, LLC | 10.0% | Class A | 13D | Dec 27, 2024 | filing ↗ |
| Jonathan M. Rothberg | 7.8% | 13D | Sep 9, 2025 | filing ↗ | |
| ARK Investment Management LLC | 7.2% | 13G | Feb 14, 2025 | filing ↗ | |
| Blackrock, Inc. | exited | Class A | 13G | Jul 29, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| John S. Vieceli | $28K | Jun 22, 2026 | filing ↗ |
| Lapointe Christian | $14K | Jun 22, 2026 | filing ↗ |
| Jeffry R. Keyes | $8K | Jun 22, 2026 | filing ↗ |
| Hawkins Jeffrey Alan | $21K | Jun 22, 2026 | filing ↗ |
| Jeffry R. Keyes | $75K | Apr 20, 2026 | filing ↗ |
| Hawkins Jeffrey Alan | $168K | Apr 20, 2026 | filing ↗ |
| John S. Vieceli | $18K | Mar 20, 2026 | filing ↗ |
| Lapointe Christian | $10K | Mar 20, 2026 | filing ↗ |
| Jeffry R. Keyes | $7K | Mar 20, 2026 | filing ↗ |
| Hawkins Jeffrey Alan | $20K | Mar 20, 2026 | filing ↗ |
| John S. Vieceli | $28K | Dec 22, 2025 | filing ↗ |
| Lapointe Christian | $15K | Dec 22, 2025 | filing ↗ |
| Jeffry R. Keyes | $11K | Dec 22, 2025 | filing ↗ |
| Hawkins Jeffrey Alan | $30K | Dec 22, 2025 | filing ↗ |
| Jonathan M. Rothberg | $80K | Oct 16, 2025 | filing ↗ |
| John S. Vieceli | $33K | Sep 22, 2025 | filing ↗ |
| Lapointe Christian | $18K | Sep 22, 2025 | filing ↗ |
| Todd C. Bennett | $61K | Sep 22, 2025 | filing ↗ |
| Jeffry R. Keyes | $13K | Sep 22, 2025 | filing ↗ |
| Hawkins Jeffrey Alan | $35K | Sep 22, 2025 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Delisting notice (3.01) | Jul 23, 2026 | filing ↗ |
| Material agreement (1.01) | Jun 18, 2026 | filing ↗ |
| New financial obligation (2.03) | Jun 18, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jun 18, 2026 | filing ↗ |
| Shareholder vote (5.07) | May 15, 2026 | filing ↗ |
| Earnings (2.02) | May 7, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 7, 2026 | filing ↗ |
| Earnings (2.02) | Mar 3, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 3, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Dec 29, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 29, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Nov 19, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 19, 2025 | filing ↗ |
| Earnings (2.02) | Nov 5, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 5, 2025 | filing ↗ |
| Material agreement (1.01) | Sep 26, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Sep 26, 2025 | filing ↗ |
| Material agreement (1.01) | Sep 23, 2025 | filing ↗ |
| Agreement terminated (1.02) | Sep 23, 2025 | filing ↗ |
| New financial obligation (2.03) | Sep 23, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Sep 23, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Aug 8, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 8, 2025 | filing ↗ |
| Earnings (2.02) | Aug 5, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 5, 2025 | filing ↗ |