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Table of Contents ( Mark One ) ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( D ) OF THE SECURITIES EXCHANGE ACT OF 1934 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , D.C. 20549 FORM 10 - K For the fiscal year ended January 2 , 2021 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( D ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from DE ( State or Other Jurisdiction of Incorporation or Organization ) 52 Discovery Irvine CA ( Address of principal executive offices ) 2 Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class : to MASIMO CORPORATION ( Exact name of registrant as specified in its charter ) Large accelerated filer Non - accelerated filer Commission File Number 001-33642 MASIMO ☐ ( 949 ) 297-7000 ( Registrant's telephone number , including area code ) 33-0368882 ( I.R.S. Employer Identification Number ) 92618 ( Zip Code ) Trading symbol : MASI Common Stock , par value $ 0.001 None Securities registered pursuant to Section 12 ( g ) of the Act : Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Name of each exchange on which registered : The Nasdaq Stock Market , LLC Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( § 232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes Yes Yes Yes No Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or an emerging growth company . See the definitions of “ large accelerated filer , ” “ accelerated filer , ” “ smaller reporting company , ” and “ emerging growth company " in Rule 12b - 2 of the Exchange Act . ■ Accelerated filer Smaller reporting company Emerging growth company ☐ If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . No No No Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act . ) 0 Yes No The aggregate market value of the voting stock held by non - affiliates of the registrant , based upon the closing sale price of the common stock on June 27 , 2020 , the last business day of the registrant's most recently completed second fiscal quarter , as reported on the Nasdaq Global Select Market , was approximately $ 9.2 billion . Shares of stock held by officers , directors and 5 percent or more stockholders have been excluded in that such persons may be deemed to be affiliates . This determination of affiliate status is not necessarily a conclusive determination for other purposes . At January 30 , 2021 , the registrant had 55,266,559 shares of common stock outstanding . DOCUMENTS INCORPORATED BY REFERENCE Items 10 , 11 , 12 , 13 and 14 of Part III of this Annual Report on Form 10 - K incorporate information by reference from the registrant's proxy statement for the registrant's 2021 Annual Meeting of Stockholders to be filed with the Securities and Exchange Commission within 120 days after the close of the fiscal year covered by this annual report on Form 10 - K .