Brennan Michelle 4

What Happened Michelle Brennan, Director and Chairman of the Board of Masimo Corp (MASI), was granted 1,119 restricted stock units (RSUs) on 2026-04-23 valued at $178.71 each, totaling $199,976. Separately, on 2026-04-29 she recorded an exercise/conversion of 1,225 derivative shares (transaction code M) at $0.00 and a simultaneous disposition of those 1,225 shares on the same date. The grant (A) is an acquisition of RSUs; the M entries reflect conversion/exercise of a derivative and an immediate disposal.

Key Details

• Grant: 1,119 RSUs on 2026-04-23 at $178.71 per share; aggregate value reported $199,976. (Transaction code A)
• Exercise/Conversion + Disposal: 1,225 shares on 2026-04-29 at $0.00 (acquired and disposed; transaction code M, reported as derivative).
• Shares owned after transactions: Not specified in this Form 4.
• Footnotes: F1 — each RSU represents the contingent right to one share upon vesting. F2 — RSUs granted 4/29/2025 vest on earlier of first anniversary or next annual meeting. F3 — RSUs granted 4/23/2026 vest on earlier of first anniversary or next annual meeting.
• Timeliness: Form filed 2026-05-05 for transactions on 2026-04-23 and 2026-04-29; the filing appears late (marked as L), which the SEC requires filers to correct promptly.

Context

• A $0.00 exercise price and the F1 footnote indicate these derivative entries are consistent with conversion of RSUs or similar derivative awards into common shares rather than a cash purchase.
• The same-day acquisition and disposition of 1,225 shares (acquire at $0.00, dispose same day) is effectively an immediate sale/transfer of converted shares; filings often reflect this when shares are sold or transferred to cover tax withholding or are otherwise transferred upon conversion.
• The notable item for investors is the new RSU grant (~$200k) to the chair; grants are routine for compensation and vesting is subject to the vesting schedule in the footnotes.