United States securities and exchange commission logo




                                                                                
                             June 7, 2024

       Joe Kiani
       Chief Executive Officer
       Masimo Corporation
       52 Discovery
       Irvine, California

                                                        Re: Masimo Corporation
                                                            Preliminary Proxy 
Statement filed May 31, 2024
                                                            File No. 001-33642

       Dear Joe Kiani:

              We have reviewed your filing and have the following comments. In 
some of our
       comments, we may ask you to provide us with information so we may better 
understand your
       disclosure.

               Please respond to these comments by providing the requested 
information or advise us as
       soon as possible when you will respond. If you do not believe our 
comments apply to your facts
       and circumstances, please tell us why in your response.

              After reviewing your response to these comments, we may have 
additional comments.
       Defined terms used herein have the same meaning as in your filing.

       Preliminary Proxy Statement filed May 31, 2024

       Background to the Solicitation, page 15

   1.                                                   Disclosure on page 15 
indicates that "the Company commenced a formal review of
                                                        strategic alternatives" 
following the 2023 Annual Meeting. It is our understanding that
                                                        such review may have 
commenced prior to the 2023 Annual Meeting. Please revise or
                                                        advise.
   2.                                                   We note your disclosure 
that    the Board determined not to approve the proposed class
                                                        switch of directors    
and instead approved the nomination of Mr. Kiani for election at the
                                                        2024 Annual Meeting. 
Please disclose why the Board determined not to approve the
                                                        proposed class switch 
of directors.
   3.                                                   We note your disclosure 
that    [f]ollowing Mr. Classon   s resignation, members of the
                                                        Board contacted and 
considered several director nominee candidates, including
                                                        Christopher Chavez.    
Please disclose who recommended Mr. Chavez to the Board. See
 Joe Kiani
Masimo Corporation
June 7, 2024
Page 2
         Item 407(c)(2)(vii) of Regulation S-K and Question 133.03 under the 
staff's Regulation S-
         K Compliance and Disclosure Interpretations.
If Mr. Kiani is not Re-Elected to the Board at this Year's Annual Meeting, page 
94

4.       We note the disclosure here that Mr. Kiani disputes Politan's ability 
to "cure" the trigger
         of the provisions of his employment agreement if he is not re-elected 
to the Board at this
         year's Annual Meeting by re-appointing him as Chairman of the Board. 
See Item 5(b) of
         Schedule 14A. Please describe in further detail (including by 
quantifying any payments
         due) the consequences if Mr. Kiani's position prevails and he is not 
re-elected to the Board
         and declines re-appointment. Please place this expanded disclosure, 
which currently
         appears on page 94, in a more prominent location in the proxy 
statement.
Transactions with Related Persons, Promoters and Certain Control Persons, page 
115

5.       Please revise your disclosure in this section to include the 
approximate dollar values of
         Mr. Kiani   s interests in the transactions with Willow and LMMV. 
Refer to Item 404(a)(4)
         of Regulation S-K.
        We remind you that the filing persons are responsible for the accuracy 
and adequacy of
their disclosures, notwithstanding any review, comments, action or absence of 
action by the staff.

         Please direct any questions to Blake Grady at 202-551-8573 or Tina 
Chalk at 202-551-
3263.



FirstName LastNameJoe Kiani                                    Sincerely,
Comapany NameMasimo Corporation
                                                               Division of 
Corporation Finance
June 7, 2024 Page 2                                            Office of 
Mergers & Acquisitions
FirstName LastName