FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      
1. Name and Address of Reporting Person * KIANI JOE E 2. Issuer Name and Ticker or Trading Symbol MASIMO CORP [ MASI ] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable)__X__ Director                    _____ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
CEO and Chairman of the Board
(Last)         (First)         (Middle)
C/O MASIMO CORPORATION, 52 DISCOVERY
3. Date of Earliest Transaction (MM/DD/YYYY)
4/14/2020
(Street)
IRVINE, CA 92618
(City)       (State)       (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)
 
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. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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  4/14/2020    M    112578  A $20.19  271819  D   
Common Stock  4/14/2020    S(1)    112578  D $190.4392 (2) 159241  D   
Common Stock  4/15/2020    M    11208  A $20.19  170449  D   
Common Stock  4/15/2020    S(1)    11208  D $193.2158 (3) 159241  D   
Common Stock  4/15/2020    M    71878  A $21.97  231119  D   
Common Stock  4/15/2020    S(1)    71878  D $200.5682 (4) 159241  D   
Common Stock  4/16/2020    M    105318  A $21.97  264559  D   
Common Stock  4/16/2020    S(1)    105318  D $204.1275 (5) 159241  D   
Common Stock                 47081  I  By Trust (6)
Common Stock                 732209  I  By Trust (6)
Common Stock                 352919  I  By Trust (6)
Common Stock                 359000  I  By Trust (6)
Common Stock                 2250291  I  By Trust (7)
Common Stock                 10368  I  See Footnote (8)
Common Stock                 9000  I  See Footnote (9)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 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 of Derivative Security: 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
Non-Qualified Stock Option (Right to Buy)  $20.19  4/14/2020    M        112578   10/27/2012 (10) 10/27/2021  Common Stock  112578.0  $20.19  11208  D   
Non-Qualified Stock Option (Right to Buy)  $20.19  4/15/2020    M        11208   10/27/2012 (10) 10/27/2021  Common Stock  11208.0  $20.19  0  D   
Non-Qualified Stock Option (Right to Buy)  $21.97  4/15/2020    M        71878   5/28/2014 (11) 5/28/2023  Common Stock  71878.0  $21.97  228122  D   
Non-Qualified Stock Option (Right to Buy)  $21.97  4/16/2020    M        105318   5/28/2014 (11) 5/28/2023  Common Stock  105318.0  $21.97  122804  D   

Explanation of Responses:
(1)  The shares covered by this Form 4 were exercised and sold pursuant to a Rule 10b5-1 Sales Plan dated as of February 24, 2020, which is intended to comply with Rule 10b5-1 promulgated under the Securities Exchange Act of 1934, as amended.
(2)  The price reported in Column 4 represents the weighted average sales price per share. The actual sales prices ranged from a low of $185.00 per share to a high of $193.35 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 transaction was effected.
(3)  The price reported in Column 4 represents the weighted average sales price per share. The actual sales prices ranged from a low of $191.25 per share to a high of $194.40 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 transaction was effected.
(4)  The price reported in Column 4 represents the weighted average sale price per share. The actual sale prices ranged from a low of $200.00 per share to a high of $202.43 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 transaction was effected.
(5)  The price reported in Column 4 represents the weighted average sale price per share. The actual sale prices ranged from a low of $202.01 per share to a high of $206.00 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 transaction was effected.
(6)  Shares held in four trusts for which Mr. Kiani is not the Trustee.
(7)  Shares held in one trust for which Mr. Kiani is the sole trustee.
(8)  Shares held in Masimo Retirement Savings Plan.
(9)  Shares held by an immediate family member for which Mr. Kiani exercises voting and investment control.
(10)  This option was granted on October 27, 2011 and was exercisable as the option vested. The option vested over a five year period, with 20% of the shares subject to the option vesting on each anniversary of the grant date.
(11)  This option was granted on May 28, 2013 and was exercisable as the option vested. The option vested over a five year period, with 20% of the shares subject to the option vesting on each anniversary of the grant date.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
KIANI JOE E
C/O MASIMO CORPORATION
52 DISCOVERY
IRVINE, CA 92618
X
CEO and Chairman of the Board

Signatures
/s/ David J. Van Ramshorst, Attorney-In-Fact 4/16/2020
**Signature of Reporting Person Date
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