Szyman Catherine M. 4

What Happened
Catherine M. Szyman, CEO and Director of Masimo Corp (MASI), had 11,141 restricted stock units (RSUs) convert to common shares on February 12, 2026, with an aggregate reported value of $1,481,307 (11,141 × $132.96). Of those shares, 4,568 were withheld by the issuer to satisfy tax withholding obligations, leaving a net 6,573 shares issued to her. This was not an open-market purchase or sale but issuance upon vesting.

Key Details

• Transaction date: 2026-02-12; Form 4 filed 2026-02-13 (filed timely).
• Primary codes: M = exercise/conversion of derivative (RSU conversion); F = shares withheld to satisfy tax withholding.
• Gross shares converted: 11,141; shares withheld for taxes: 4,568; net shares delivered: 6,573.
• Reported per-share value for the conversion: $132.96; total reported value ≈ $1.48 million.
• Shares owned after the transaction are not disclosed in the provided filing.
• Footnote: These shares came from a 33,424-RSU grant made Feb 12, 2025 that vests ratably over three years (one-third vested 2/12/2026; remaining vest in equal installments on years 2 and 3).

Context
This was a routine vesting of RSUs rather than a market buy or sale. The withholding of 4,568 shares is a common cashless method employers use to cover required tax obligations on vested equity and does not imply a separate sale action by the insider. For retail investors, vested RSUs increase insider ownership (net +6,573 shares here) but are typically part of standard compensation schedules.