MASIMO CORP — Director's Dealing 2011

Jan 25, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MASIMO CORP (MASI)
CIK: 0000937556
Period of Report: 2011-01-21

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-01-21	Common Stock	M	12000	$2.75	Acquired	12000	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-01-21	Incentive Stock Option	$2.75	M	12000	Disposed	2011-01-25	Common Stock (12000)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	46000	Direct

Footnotes

F1: 12,000 shares are vested and exercisable. There are zero shares exercisable on this particular Incentive Stock Option.