Szyman Catherine M. 4

What Happened

• Catherine M. Szyman, CEO and Director of Masimo Corp (MASI), had 2,101 restricted stock units (RSUs) vest on March 11, 2026. Upon vesting the RSUs converted to 2,101 shares (transaction code M). To cover tax withholding obligations, 1,069 of those shares were withheld by the issuer at $175.47 per share for a total withholding value of $187,577 (transaction code F). The net result: Szyman received 2,101 issued shares, had 1,069 shares withheld for taxes, and retained 1,032 shares.

Key Details

• Transaction date: March 11, 2026; Form filed March 16, 2026 (filed late relative to the typical two-business-day rule).
• Conversions/issuances: 2,101 shares issued upon RSU vesting (M) at $0.00 reported price for the conversion.
• Tax withholding: 1,069 shares withheld at $175.47 per share, total $187,577 (F).
• Net new shares retained by insider: 1,032 shares.
• Shares owned after transaction: not specified in the provided filing excerpt.
• Footnotes: (1) 8,407 RSUs were originally granted Mar 11, 2025 and vest ratably over 4 years (25% vested Mar 11, 2026). (2) Shares withheld were to satisfy tax withholding on vesting. (3) Each RSU equals the contingent right to one share upon vesting.
• Transaction codes explained: M = exercise or conversion of derivative (here, RSUs converting to shares); F = shares withheld to pay tax withholding obligations.

Context

• This was not an open-market sale or purchase but routine vesting of RSUs and associated tax withholding—common for executive compensation. The filing was submitted on Mar 16 for a Mar 11 transaction, which is later than the standard two-business-day Form 4 deadline; late filing can reduce timeliness for investors tracking insider activity.