MASIMO CORP — Director's Dealing 2025

Sep 26, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MASIMO CORP (MASI)
CIK: 0000937556
Period of Report: 2025-09-23

Reporting Person: Tripodi Blair (COO, Consumer Division)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-09-23	Common Stock	M	15000	$142.13	Acquired	21896	Direct
2025-09-23	Common Stock	F	8078	—	Disposed	13818	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-09-23	Restricted Stock Units	$	M	15000	Disposed		Common Stock (15000)	Direct

Footnotes

F1: The transaction was completed prior to the market open on September 23, 2025, and the Company used the stock price from prior day for the restricted stock unit settlement and related payroll tax purposes.

F2: These shares were withheld by the Issuer in order to satisfy certain tax withholding obligations in connection with the issuance of shares upon the vesting of certain restricted stock units.

F3: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of the Issuer upon vesting of the RSU.

F4: These restricted stock units were granted on March 1, 2024.

F5: On September 23, 2025, in connection with the Company's sale of its consumer audio business, Mr. Tripodi resigned from the Company for good reason, as defined in the Restricted Stock Unit Award Agreement applicable to this grant, resulting in the full acceleration of the remaining unvested restricted stock units.