Keyes Jeffry R. 4

4 · Quantum-Si Inc · Filed Jun 24, 2026

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Updated Jun 25, 2026

Quantum-Si (QSI) CFO Jeffry Keyes Sells Shares

What Happened

Jeffry R. Keyes, Chief Financial Officer of Quantum-Si Inc. (QSI), sold a total of 8,233 shares in two open-market transactions tied to a mandatory sell-to-cover for tax withholding. On 2026-06-22 he sold 4,116 shares at $0.96 per share for $3,941, and on 2026-06-23 he sold 4,117 shares at $0.90 per share for $3,701 — total proceeds ≈ $7,642. These transactions are dispositions (sales), not purchases.

Key Details

Transaction dates and amounts:
- 2026-06-22: 4,116 shares sold at $0.96 — $3,941
- 2026-06-23: 4,117 shares sold at $0.90 — $3,701
Price detail (footnotes): weighted-average sales prices reported; sales occurred across price ranges of $0.9212–$1.005 and $0.88–$0.9291 (per filing footnotes).
Reason: Footnote states sales were mandatory sell-to-cover to satisfy federal, state and local tax withholding on vested restricted stock units (RSUs).
Shares owned after the transactions: not specified in the provided excerpt of the filing.
Filing: Form 4 filed 2026-06-24 reporting transactions on 2026-06-22 and 2026-06-23; filing appears timely based on dates shown.

Context

These were tax-withholding (sell-to-cover) sales related to RSU vesting, which are common and generally routine administrative dispositions rather than open-market investment decisions by the insider.
Transaction code: S (sale); footnote indicates tax-withholding nature (commonly reported as F/withholding).

Form 4

Period: 2026-06-22

Chief Financial Officer

Transactions

Sale
Class A Common Stock
[F1][F2]
2026-06-22$0.96/sh−4,116$3,941→ 1,728,466 total
Sale
Class A Common Stock
[F1][F3]
2026-06-23$0.90/sh−4,117$3,701→ 1,724,349 total

Footnotes (3)

[F1]Represents shares sold pursuant to a mandatory Quantum-Si sell-to-cover provision for required federal, state and local withholding taxes in connection with the vesting of previously granted restricted stock units. Individual is not able to alter this mandatory sell-to-cover provision that is enacted at the grant date of the related restricted stock unit award.
[F2]Represents the weighted average sales price per share. The shares sold at prices ranging from $0.9212 to $1.005 per share. Full information regarding the number of shares sold at each price shall be provided upon request to the staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder of the Issuer.
[F3]Represents the weighted average sales price per share. The shares sold at prices ranging from $0.88 to $0.9291 per share. Full information regarding the number of shares sold at each price shall be provided upon request to the staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder of the Issuer.

Signature

/s/ Christian LaPointe, Ph.D., Attorney-in-Fact.|2026-06-24

1 file