MASIMO CORP — Director's Dealing 2019

May 17, 2019

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MASIMO CORP (MASI)
CIK: 0000937556
Period of Report: 2019-05-16

Reporting Person: Van Ramshorst David J (Chief Accounting Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2019-05-16	Common Stock	M	350	$37.84	Acquired	1350	Direct
2019-05-16	Common Stock	S	350	$145	Disposed	1000	Direct
2019-05-16	Common Stock	M	1500	$29.90	Acquired	2500	Direct
2019-05-16	Common Stock	S	1500	$145	Disposed	1000	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2019-05-16	Non-Qualified Stock Option (Right to Buy)	$37.84	M	350	Disposed	2026-02-28	Common Stock (350.0)	Direct
2019-05-16	Non-Qualified Stock Option (Right to Buy)	$29.9	M	1500	Disposed	2025-02-20	Common Stock (1500.0)	Direct

Footnotes

F1: The shares covered by this Form 4 were exercised and sold pursuant to a Rule 10b5-1 Sales Plan dated as of March 13, 2019, which is intended to comply with Rule 10b5-1 promulgated under the Securities Exchange Act of 1934, as amended.

F2: This option was granted on February 29, 2016 and is exercisable as the option vests. The option vests over a five year period, with 20% of the shares subject to the option vesting on each anniversary of the grant date.

F3: This option was granted on February 20, 2015 and is exercisable as the option vests. The option vests over a five year period, with 20% of the shares subject to the option vesting on each anniversary of the grant date.