Keyes Jeffry R. 4

What Happened
Jeffry R. Keyes, Chief Financial Officer of Quantum-Si Inc. (QSI), disposed of a total of 8,655 shares via two sales tied to restricted stock unit (RSU) vesting. On 2026-03-20 he sold 4,233 shares at an average reported price of $0.85 for proceeds of $3,591, and on 2026-03-23 he sold 4,422 shares at an average reported price of $0.83 for proceeds of $3,655. These were sales (not purchases) and reflect routine tax-withholding activity rather than an open-market investment decision.

Key Details

• Transaction dates and amounts: 2026-03-20 — 4,233 shares @ $0.85 (proceeds $3,591); 2026-03-23 — 4,422 shares @ $0.83 (proceeds $3,655). Total shares sold: 8,655; total proceeds: $7,246.
• Transaction type: Disposition (S) — open market or private sale as reported.
• Shares owned after transaction: Not specified in the provided filing excerpt.
• Footnotes: F1 — sales were mandatory sell-to-cover to satisfy federal, state and local tax withholding on vested RSUs (the insider cannot alter this provision). F2/F3 — reported prices are weighted averages; individual share sale prices ranged from $0.7973 to $0.8718 per share; detailed breakdown available upon request to the SEC staff or issuer.
• Filing timing: Reported on Form 4 with Period of Report 2026-03-20 and filed 2026-03-24 (filed within the typical two-business-day reporting window following the transactions).

Context
These sales were executed solely to cover tax withholding on vested RSUs (a common, automated practice) and therefore do not necessarily indicate the CFO's market view. For retail investors, purchases generally carry more direct informational value about insider sentiment; mandatory sell-to-cover transactions are routine administrative actions.