MASIMO CORP — Director's Dealing 2018

May 4, 2018

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MASIMO CORP (MASI)
CIK: 0000937556
Period of Report: 2018-05-03

Reporting Person: Coleman Jon (Pres-WW Sales,Pro Svc,Med Affs)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2018-05-03	Common Stock	M	25000	$40.20	Acquired	34201	Direct
2018-05-03	Common Stock	S	25000	$95	Disposed	9201	Direct
2018-05-03	Common Stock	M	25000	$30.06	Acquired	34201	Direct
2018-05-03	Common Stock	S	25000	$92.50	Disposed	9201	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2018-05-03	Non-Qualified Stock Option (Right to Buy)	$40.2	M	25000	Disposed	2018-08-11	Common Stock (25000.0)	Direct
2018-05-03	Non-Qualified Stock Option (Right to Buy)	$30.06	M	25000	Disposed	2021-02-22	Common Stock (25000.0)	Direct

Footnotes

F1: The shares covered by this Form 4 were exercised and sold pursuant to a Rule 10b5-1 Sales Plan dated March 9, 2018, 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 August 11, 2008 and is exercisable as the option vests. This option vests over a five year period, with 20% of the shares subject to the option vesting on each anniversary date.

F3: This option was granted on February 22, 2011 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.