Ownership Submission
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

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
de Raad Mark
   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)
EVP & Chief Financial Officer
(Last)
(First)
(Middle)
C/O MASIMO CORPORATION, 52 DISCOVERY		 3. Date of Earliest Transaction (Month/Day/Year)
03/31/2017
(Street)

IRVINE, CA 92618		 4. If Amendment, Date 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
(City)
(State)
(Zip)
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 03/31/2017   M   6,000 A $ 37.84 14,660 D  
Common Stock 03/31/2017   S(1)   6,000 D $ 93.1323 (2) 8,660 D  
Common Stock 03/31/2017   M   12,000 A $ 31.01 20,660 D  
Common Stock 03/31/2017   S(1)   12,000 D $ 93.135 (3) 8,660 D  
Common Stock 04/03/2017   M   12,000 A $ 21.97 20,660 D  
Common Stock 04/03/2017   S(1)   12,000 D $ 93.3121 (4) 8,660 D  
Common Stock 04/04/2017   M   18,000 A $ 28.03 26,660 D  
Common Stock 04/04/2017   S(1)   18,000 D $ 93.3354 (5) 8,660 D  

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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 Underlying Securities
(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) $ 37.84 03/31/2017   M     6,000 02/28/2017(6) 02/28/2026 Common Stock 6,000 $ 37.84 24,000 D  
Non-Qualified Stock Option (Right to Buy) $ 31.01 03/31/2017   M     12,000 03/20/2016(7) 03/20/2025 Common Stock 12,000 $ 31.01 18,000 D  
Non-Qualified Stock Option (Right to Buy) $ 21.97 04/03/2017   M     12,000 05/28/2014(8) 05/28/2023 Common Stock 12,000 $ 21.97 12,000 D  
Non-Qualified Stock Option (Right to Buy) $ 28.03 04/04/2017   M     18,000 02/18/2015(9) 02/18/2024 Common Stock 18,000 $ 28.03 12,000 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
de Raad Mark
C/O MASIMO CORPORATION
52 DISCOVERY
IRVINE, CA 92618		       EVP & Chief Financial Officer  

Signatures

 /s/ David J. Van Ramshorst, Attorney-In-Fact   04/04/2017
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) The shares covered by this Form 4 were exercised and sold pursuant to a Rule 10b5-1 Sales Plan dated as of March 17, 2017, 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 sale price per share. The actual sale prices ranged from a low of $92.77 per share to a high of $93.48 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 sale price per share. The actual sale prices ranged from a low of $92.76 per share to a high of $93.50 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 $92.76 per share to a high of $94.67 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 $92.94 per share to a high of $93.83 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) This option was granted on February 29, 2016 and is exercisable as the option vests. The option vests over a five year period, with 20% of the shares subject to the option vesting on each anniversary of the grant date.
(7) This option was granted on March 20, 2015 and is exercisable as the option vests. This option vests over a five year period, with 20% of the shares subject to the option vesting on each anniversary of the grant date.
(8) This option was granted on May 28, 2013 and is exercisable as the option vests. This option vests over a five year period, with 20% of the shares subject to the option vesting on each anniversary of the grant date.
(9) This option was granted on February 18, 2014 and is exercisable as the option vests. This option vests over a five year period, with 20% of the shares subject to the option vesting on each anniversary of the grant date.

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