Exhibit 24
POWER OF ATTORNEY

Know all by these presents, that the undersigned hereby constitutes and appoints each of Micah Young, Tom McClenahan, Paul Hatiashi and Peter Molnar, signing singly, the undersigned’s true and lawful attorney-in-fact and agent to:

(1) execute for and on behalf of the undersigned, an officer, director and/or holder of 10% or more of a registered class of securities of Masimo Corporation, a Delaware corporation (the “Company”), Forms 3, 4 and 5 in accordance with Section 16(a) of the Securities Exchange Act of 1934, as amended, and the rules promulgated thereunder;

(2) do and perform any and all acts for and on behalf of the undersigned that may be necessary or desirable to complete and execute any such Form 3, 4 and 5, complete and execute any amendment or amendments thereto, and timely file such forms or amendments with the United States Securities and Exchange Commission and any stock exchange or similar authority, as required; and

(3) take any other action of any nature whatsoever in connection with the foregoing which, in the opinion of any such attorney-in-fact, may be of benefit to, in the best interest of, or legally required by, the undersigned, it being understood that the documents executed by such attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may approve in such attorney-in-fact’s discretion.

The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact’s substitute or substitutes, shall lawfully do or cause to be done by virtue of this power of attorney and the rights and powers herein granted. The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming, nor is the Company assuming, any of the undersigned’s responsibilities to comply with Section 16 of the Securities Exchange Act of 1934, as amended.

This Power of Attorney shall remain in full force and effect with respect to the undersigned until the earliest to occur of (a) such date that the undersigned is no longer required to file Forms 3, 4 and 5 with respect to the undersigned’s holdings of and transactions in securities issued by the Company, or (b) the revocation by the undersigned in a signed writing delivered to the Company and the foregoing attorneys-in-fact. This Power of Attorney shall terminate with respect to each of the foregoing attorneys-in-fact at such time as such attorney-in-fact is no longer employed by the Company or any of its subsidiaries.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 23rd day of September, 2024.

/s/ William Jellison
Signature

William Jellison
Print Name

Masimo (NASDAQ:MASI)
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