Keyes Jeffry R. 4

4 · Quantum-Si Inc · Filed Apr 22, 2026

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Updated Apr 22, 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 74,763 shares in two transactions tied to the vesting of previously granted restricted stock units (RSUs). On 2026-04-20 he sold 37,382 shares at $1.01 each for $37,621, and on 2026-04-21 he sold 37,381 shares at $0.99 each for $37,194, for combined proceeds of approximately $74,815. These were sales (routine cash-generating transactions), not purchases.

Key Details

Transaction dates and prices:
- 2026-04-20: 37,382 shares at $1.01 — $37,621
- 2026-04-21: 37,381 shares at $0.99 — $37,194
Total shares sold: 74,763; total proceeds: ~$74,815.
Shares owned after transaction: Not disclosed in this filing.
Footnotes of note:
- F1: These sales were mandatory sell-to-cover transactions to satisfy federal, state and local tax withholding on RSU vesting; the insider cannot change this provision.
- F2 / F3: Weighted average sale prices reported; individual sale prices ranged from about $0.9763 to $1.05 per share. Detailed per-trade price breakdowns are available on request to the SEC staff or issuer.
Filing timeliness: Report filed 2026-04-22 covering transactions on 2026-04-20 and 2026-04-21; appears to be filed within the standard Form 4 reporting window.

Context

These sales were tax-withholding (sell-to-cover) actions associated with RSU vesting and are generally considered routine administrative transactions rather than direct signals of the insider’s view on the company’s stock. They differ from discretionary open-market sales where intent might be more informative.

Form 4

Period: 2026-04-20

Chief Financial Officer

Transactions

Sale
Class A Common Stock
[F1][F2]
2026-04-20$1.01/sh−37,382$37,621→ 1,769,963 total
Sale
Class A Common Stock
[F1][F3]
2026-04-21$0.99/sh−37,381$37,194→ 1,732,582 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 $0.9811 to $1.05 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 $0.9763 to $1.04 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.|2026-04-22

1 file