MASIMO CORP — Director's Dealing 2013

May 24, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MASIMO CORP (MASI)
CIK: 0000937556
Period of Report: 2013-05-22

Reporting Person: Coleman Robert (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-05-22	Common Stock	M	59400	$2.75	Acquired	129600	Direct
2013-05-22	Common Stock	S	59400	$21.9257	Disposed	70200	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-05-22	Non-qualified Stock Option (Right to buy)	$2.75	M	59400	Disposed	2013-05-22	Common Stock (59400)	Direct

Footnotes

F1: This option was granted on May 22, 2003 and is exercisable as the option vests. This option was fully vested as of May 22, 2008.

F2: The shares covered by this Form 4 have been acquired/sold pursuant to a Rule 10b5-1 Sales Plan dated as of May 7, 2013, which is intended to comply with Rule 10b5-1 promulgated under the Securities Exchange Act of 1934, as amended.