FORM 4		UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Expires: December 31, 2014 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person * Hataishi Paul (Last) (First) (Middle) C/O MASIMO CORPORATION 52 DISCOVERY (Street) IRVINE CA 92618 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol MASIMO CORP [ MASI ]	5. 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
	3. Date of Earliest Transaction (Month/Day/Year) 06/10/2026
	4. 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 Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction 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	06/10/2026		D		13,317	D	$ 180 (1) (2)	0	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction 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 (Month/Day/Year)		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: 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	(4)	06/10/2026		D			627	(1) (3) (4)	(1) (3) (4)	Common Stock	627	(3)	0	D
Restricted Stock Units	(5)	06/10/2026		D			910	(1) (3) (5)	(1) (3) (5)	Common Stock	910	(3)	0	D
Restricted Stock Units	(6)	06/10/2026		D			3,224	(1) (3) (6)	(1) (3) (6)	Common Stock	3,224	(3)	0	D
Restricted Stock Units	(7)	06/10/2026		D			3,380	(1) (3) (7)	(1) (3) (7)	Common Stock	3,380	(3)	0	D
Restricted Stock Units	(8)	06/10/2026		D			3,134	(1) (3) (8)	(1) (3) (8)	Common Stock	3,134	(3)	0	D

Explanation of Responses:

1. On June 10, 2026, pursuant to the Agreement and Plan of Merger, dated February 16, 2026, by and among Masimo Corporation (the "Issuer"), Danaher Corporation ("Parent"), and Mobius Merger Sub, Inc. ("Merger Sub"), Merger Sub merged with and into the Issuer, with the Issuer continuing as the surviving corporation and a wholly owned subsidiary of Parent (the "Merger").

2. On June 10, 2026, at the effective time of the Merger, each share of the Issuer's common stock, par value $0.001 per share (the "Common Stock") issued and outstanding prior to the effective time of the Merger (other than certain excluded shares and dissenting shares) was canceled, extinguished and converted into the right to receive an amount in cash equal to $180.00 per share, without interest (the "Per Share Merger Consideration").

3. On June 10, 2026, at the effective time of the Merger, each of the Issuer's restricted stock units ("RSUs") (other than certain RSUs held by the Issuer's non-employee directors) was assumed by Parent and converted into a number of RSUs of Parent equal to the product of the number of shares of Parent common stock equal to the number of shares of Common Stock underlying such RSU multiplied by the quotient of (a) the Per Share Merger Consideration, divided by (b) the volume-weighted average trading price per share of Parent's common stock for the ten trading day period ending on and including June 10, 2026 ($183.33).

4. Represents the unvested portion of RSUs granted on March 9, 2022, which award of RSUs was to vest as follows: 60% vests on the third anniversary of the grant date, an additional 20% vests on the fourth anniversary of the grant date, and the final 20% vests on the fifth anniversary of the grant date.

5. Represents the unvested portion of RSUs granted on March 8, 2023, which award of RSUs was to vest ratably over five years.

6. Represents the unvested portion of RSUs granted on November 16, 2023, which award of RSUs was to vest ratably over five years.

7. Represents the unvested portion of RSUs granted on March 13, 2025, which award of RSUs was to vest ratably over five years.

8. Represents the unvested portion of RSUs granted on March 13, 2026, which award of RSUs was to vest ratably over four years.

	/s/ Micah W. Young, Attorney-In-Fact	06/12/2026
	** Signature of Reporting Person	Date
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