ROTHBERG JONATHAN M 4

What Happened
Jonathan M. Rothberg, a reported 10% owner of Quantum-Si Inc. (QSI), was granted an award of 251,185 derivative shares (reported at $0.00 per share) on May 18, 2026. The filing (Form 4) was submitted May 20, 2026. Footnotes indicate these are options whose underlying shares vest at the issuer's next regular annual stockholders meeting, subject to continued service.

Key Details

• Transaction date: 2026-05-18; Form 4 filed: 2026-05-20 (timely filing).
• Instrument: Derivative grant (listed as "A" — award/grant); 251,185 shares reported at $0.00 per share.
• Vesting: Shares underlying the option vest on the date of the issuer’s next regular annual stockholders meeting, subject to continued service (footnote F2).
• Ownership after transaction: Not specified in the Form 4 provided.
• Notable relationships/disclaimers: Dr. Rothberg is sole manager of several entities and is spouse to Bonnie E. Gould Rothberg, MD; he disclaims beneficial ownership of shares held by his spouse and by 23rd Century Capital LLC (footnote F1).

Context
This was an equity award (derivative/option grant), not an open-market buy or sell. Such grants are commonly used for compensation or retention and do not by themselves signal a buy or sell decision by the insider. As a 10% owner, Rothberg is a significant stakeholder; however, the filing’s footnotes limit his claimed beneficial ownership of certain related-party holdings.