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) 1/7/2021
(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)
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock								179241	D
Common Stock	1/7/2021		S⁽¹⁾		1542	D	$280.0476 ⁽²⁾	145539 ⁽³⁾	I	By Trust ⁽⁴⁾
Common Stock	1/8/2021		S⁽¹⁾		52698	D	$281.927 ⁽⁵⁾	92841	I	By Trust ⁽⁴⁾
Common Stock	1/11/2021		S⁽¹⁾		9034	D	$280.4475 ⁽⁶⁾	83807	I	By Trust ⁽⁴⁾
Common Stock								632209 ⁽³⁾	I	By Trust ⁽⁴⁾
Common Stock								352919	I	By Trust ⁽⁴⁾
Common Stock								359000	I	By Trust ⁽⁴⁾
Common Stock								2250291	I	By Trust ⁽⁷⁾
Common Stock								10368	I	See Footnote ⁽⁸⁾
Common Stock								9000	I	See Footnote ⁽⁹⁾

*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)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)			11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:
(1)	The shares covered by this Form 4 were exercised and sold pursuant to a Rule 10b5-1 Sales Plan dated as of November 12, 2020, which is intended to comply with Rule 10b5-1 promulgated under the Securities Exchange Act of 1934.
(2)	The price reported in Column 4 represents the weighted average sale price per share. The actual sale prices ranged from a low of $280.00 per share to a high of $280.21 per share. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer, or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
(3)	On January 8, 2021, 100,000 shares were transferred between two trusts for which Mr. Kiani is not the Trustee.
(4)	Shares held in four trusts for which Mr. Kiani is not the Trustee.
(5)	The price reported in Column 4 represents the weighted average sale price per share. The actual sale prices ranged from a low of $280.00 per share to a high of $284.86 per share. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer, or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
(6)	The price reported in Column 4 represents the weighted average sale price per share. The actual sale prices ranged from a low of $280.00 per share to a high of $283.75 per share. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer, or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
(7)	Shares held in one trust for which Mr. Kiani is the sole Trustee.
(8)	Shares held in Masimo Retirement Savings Plan.
(9)	Shares held by an immediate family member for which Mr. Kiani exercises voting and investment control.

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