Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF 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 *
  Muhsin Bilal
 2. Date of Event Requiring Statement (Month/Day/Year)
03/16/2018		 3. Issuer Name and Ticker or Trading Symbol
MASIMO CORP [MASI]
(Last)
(First)
(Middle)
C/O MASIMO CORPORATION, 52 DISCOVERY		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
EVP, ENG, MKTG & REG
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

IRVINE, CA 92618		 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 Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Non-Qualified Stock Option (Right to Buy) 04/02/2013(1) 04/02/2022 Common Stock 10,000 $ 23.89 D  
Non-Qualified Stock Option (Right to Buy) 03/15/2014(2) 03/15/2023 Common Stock 10,000 $ 19.9 D  
Non-Qualified Stock Option (Right to Buy) 08/20/2015(3) 08/20/2024 Common Stock 25,000 $ 21.69 D  
Non-Qualified Stock Option (Right to Buy) 05/13/2016(4) 05/13/2025 Common Stock 50,000 $ 34.51 D  
Non-Qualified Stock Option (Right to Buy) 03/01/2017(5) 02/28/2026 Common Stock 30,000 $ 37.84 D  
Non-Qualified Stock Option (Right to Buy) 08/14/2018(6) 08/14/2027 Common Stock 30,000 $ 85.54 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Muhsin Bilal
C/O MASIMO CORPORATION
52 DISCOVERY
IRVINE, CA 92618		       EVP, ENG, MKTG & REG  

Signatures

/s/ David J. Van Ramshorst, Attorney-In-Fact 03/20/2018
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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) This option was granted on April 2, 2012 and is exercisable as the option vests. The option vests over a 5 year period, with 20% of the shares subject to the option vesting on each anniversary of the grant date.
(2) This option was granted on March 15, 2013 and is exercisable as the option vests. The option vests over a 5 year period, with 20% of the shares subject to the option vesting on each anniversary of the grant date.
(3) This option was granted on August 20, 2014 and is exercisable as the option vests. The option vests over a 5 year period, with 20% of the shares subject to the option vesting on each anniversary of the grant date.
(4) This option was granted on May 13, 2015 and is exercisable as the option vests. The option vests over a 5 year period, with 20% of the shares subject to the option vesting on each anniversary of the grant date.
(5) This option was granted on February 29, 2016 and is exercisable as the option vests. The option vests over a 5 year period, with 20% of the shares subject to the option vesting on each anniversary of the grant date.
(6) This option was granted on August 14, 2017 and is exercisable as the option vests. The option vests over a 5 year period, with 20% of the shares subject to the option vesting on each anniversary of the grant date.
 
Remarks:
Exhibit 24 - Power of Attorney

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