MASIMO CORP — Director's Dealing 2012

Dec 31, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MASIMO CORP (MASI)
CIK: 0000937556
Period of Report: 2012-12-27

Reporting Person: Lee Yongsam (EVP, CIO, Regulatory Affairs)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-12-27	Common Stock	S	46000	$20.1898	Disposed	24000	Direct
2012-12-28	Common Stock	M	6540	$2.75	Acquired	30540	Direct
2012-12-31	Common Stock	M	38460	$2.75	Acquired	69000	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-12-28	Incentive Stock Option (Right to Buy)	$2.75	M	6540	Disposed	2013-01-23	Common Stock (6540)	Direct
2012-12-31	Incentive Stock Option (Right to Buy)	$2.75	M	13080	Disposed	2013-01-23	Common Stock (13080)	Direct
2012-12-31	Incentive Stock Option (Right to Buy)	$2.75	M	25380	Disposed	2013-07-14	Common Stock (25380)	Direct

Footnotes

F1: The 46,000 shares disposed of have been sold pursuant to a Rule 10b5-1 Sales Plan dated December 12, 2012, which is intended to comply with Rule 10b5-1 promulgated under the Securities Exchange Act of 1934, as amended.