Anand Sampath - 28 Jan 2026 Form 4 Insider Report for MASIMO CORP (MASI)

Role: EVP, Ops & Clinical Research
Signature: /s/ Micah W. Young, Attorney-In-Fact
Issuer symbol: MASI
Transactions as of: 28 Jan 2026
Net transactions value: -$1,420,370
Form type: 4
Filing time: 30 Jan 2026, 20:13:11 UTC
Next filing: 10 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Sampath Anand	EVP, Ops & Clinical Research	C/O MASIMO CORPORATION, 52 DISCOVERY, IRVINE	/s/ Micah W. Young, Attorney-In-Fact	30 Jan 2026	0001406493

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MASI	Common Stock	Options Exercise	$1,135,200	+30,000	+101%	$37.84	59,589	28 Jan 2026	Direct
transaction	MASI	Common Stock	Sale	$1,628,341	-11,924	-20%	$136.56	47,665	28 Jan 2026	Direct	F1, F2
transaction	MASI	Common Stock	Sale	$900,163	-6,560	-14%	$137.22	41,105	28 Jan 2026	Direct	F1, F3
transaction	MASI	Common Stock	Sale	$27,066	-196	-0.48%	$138.09	40,909	28 Jan 2026	Direct	F1, F4

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	MASI	Non-Qualified Stock Option (Right to Buy)	Options Exercise	$0	-30,000	-100%	$0.000000	0	28 Jan 2026	Common Stock	30,000	$37.84	Direct	F5

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The shares covered by this Form 4 were exercised and sold pursuant to a Rule 10b5-1 Sales Plan dated as of September 12, 2025, which is intended to comply with Rule 10b5-1 promulgated under the Securities Exchange Act of 1934, as amended.
F2	The price reported in Column 4 represents the weighted average purchase price per share. The actual sale prices ranged from a low of $135.94 per share to a high of $136.94 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 transactions were effected.
F3	The price reported in Column 4 represents the weighted average purchase price per share. The actual sale prices ranged from a low of $136.95 per share to a high of $137.89 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 transactions were effected.
F4	The price reported in Column 4 represents the weighted average purchase price per share. The actual sale prices ranged from a low of $138.07 per share to a high of $138.12 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 transactions were effected.
F5	This option was granted on February 29, 2016 and is exercisable as the option vests. The option vested over a 5 year period, with 20% of the shares subject to the option vesting on each anniversary of the grant date.