Statement of Changes in Beneficial Ownership (4)

FORM 4

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person * KIANI JOE E	2. Issuer Name and Ticker or Trading Symbol MASIMO CORP [ MASI ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director                    _____ 10% Owner __X__ Officer (give title below)    _____ Other (specify below) CEO and Chairman of the Board
(Last)          (First)          (Middle) C/O MASIMO CORPORATION, 52 DISCOVERY	3. Date of Earliest Transaction (MM/DD/YYYY) 1/2/2021
(Street) IRVINE, CA 92618 (City)        (State)        (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)	6. Individual or Joint/Group Filing (Check Applicable Line) _X _ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	3. Trans. Code (Instr. 8)		4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	1/2/2021		M		20000	A	$0	179241	D
Common Stock								47081	I	By Trust (1)
Common Stock								732209	I	By Trust (1)
Common Stock								352919	I	By Trust (1)
Common Stock								359000	I	By Trust (1)
Common Stock								2250291	I	By Trust (2)
Common Stock								10368	I	See Footnote (3)
Common Stock								9000	I	See Footnote (4)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. Trans. Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	(5)	1/2/2021		M			20000	(6)	(6)	Common Stock	20000.0	$0	20000	D

Explanation of Responses:
(1)	Shares held in four trusts for which Mr. Kiani is not the Trustee.
(2)	Shares held in one trust for which Mr. Kiani is the sole trustee.
(3)	Shares held in Masimo Retirement Savings Plan.
(4)	Shares held by an immediate family member for which Mr. Kiani exercises voting and investment control.
(5)	Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of the Issuer upon vesting of the RSU.
(6)	On February 27, 2018, the Reporting Person was granted 100,000 restricted stock units, 20% of which were vested upon grant and 20% of which will vest on the first business day of each fiscal year thereafter.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
KIANI JOE E C/O MASIMO CORPORATION 52 DISCOVERY IRVINE, CA 92618	X		CEO and Chairman of the Board

Signatures
/s/ J. Todd Koning, Attorney-In-Fact		1/6/2021
**Signature of Reporting Person		Date