SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person* Koning John Todd (Last) (First) (Middle) C/O MASIMO CORPORATION 52 DISCOVERY (Street) IRVINE CA 92618 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 10/26/2020	3. Issuer Name and Ticker or Trading Symbol MASIMO CORP [ MASI ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director 10% Owner X Officer (give title below) Other (specify below) SVP, Chief Accounting Officer	5. If Amendment, Date of Original Filed (Month/Day/Year)
			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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Non-Qualified Stock Option (Right to Buy)	04/30/2019(1)	04/30/2028	Common Stock	12,000	$89.73	D
Non-Qualified Stock Option (Right to Buy)	03/12/2021(2)	03/12/2030	Common Stock	3,316	$179.42	D
Restricted Stock Units	03/15/2020(3)	03/15/2029	Common Stock	2,397	$0.0(4)	D
Restricted Stock Units	06/01/2023(5)	06/01/2030	Common Stock	1,477	$0.0(4)	D

Explanation of Responses:

1. This option was granted on April 30, 2018 and is exercisable as the option vests. The option vests over a 5 year period, with 20% of the shares subject to the option vesting on each anniversary of the grant date.

2. This option was granted on March 12, 2020 and is exercisable as the option vests. The option vests over a 5 year period, with 20% of the shares subject to the option vesting on each anniversary of the grant date.

3. These restricted stock units (RSUs) were granted on March 15, 2019 and vest over a 5 year period, with 20% of the shares subject to the RSU award vesting on each anniversary of the grant date.

4. Each RSU represents the contingent right to receive one share of common stock of the Issuer upon vesting of the RSU.

5. These RSUs were granted on June 1, 2020 and vest over a 5 year period, with 60% of the shares subject to the RSU award vesting on the three year anniversary of the grant date, and 20% of the shares vesting on each of the subsequent anniversaries of the grant date.

Remarks:

Exhibit 24 - Power of Attorney

	/s/ J. TODD KONING	11/05/2020
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
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