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FORM10-K/A (Amendment No.1) (Mark One) ANNUAL REPORT PURSUANT TO SECTION13 OR 15(D)OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscalyear ended January3, 2026OR ☐TRANSITION REPORT PURSUANT TO SECTION13 OR 15(D)OF THE SECURITIES EXCHANGE ACT OF 1934For the transition period fromtoCommission File Number 001-33642 MASIMO CORPORATION (Exact name of registrant as specified in its charter) DE(State or Other Jurisdiction ofIncorporation or Organization)52 Discovery Irvine, CA(Address of principal executive offices) 33-0368882(I.R.S. EmployerIdentification Number)92618(Zip Code)(949) 297-7000 (Registrant’s telephone number, including area code) Securities registered pursuant to Section 12(b) of the Act: Name of each exchange on whichregistered:The Nasdaq Stock Market LLC Securities registered pursuant to Section 12(g) of the Act: None. Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. ☒Yes☐No Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of theAct. Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of theSecurities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant wasrequired to file such reports), and (2) has been subject to such filing requirements for the past 90 days.☒Yes☐No Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to besubmitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or forsuch shorter period that the registrant was required to submit such files).☒Yes☐No Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, asmaller 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. If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transitionperiod for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of theExchange Act.☐ Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment ofthe effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.☒ If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financialstatements of the registrant included in the filing reflect the correction of an error to previously issued financialstatements.☐ Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis ofincentive-based compensation received by any of the registrant’s executive officers during the relevant recovery periodpursuant to §240.10D-1(b).☐ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the ExchangeAct.)☐Yes☒No The aggregate market value of the voting stock held by non-affiliates of the registrant, based upon the closing saleprice of the common stock on June28, 2025, the last business day of the registrant’s most recently completed secondfiscal quarter, as reported on the Nasdaq Global Select Market, was approximately $3.9 billion. Shares of stock held byofficers, directors and 5percent or more stockholders have been excluded in that such persons may be deemed to beaffiliates. This determination of affiliate status is not necessarily a conclusive determination for other purposes. AtJanuary31, 2026, the registrant had 52,192,538 shares of common stock outstanding. DOCUMENTS INCORPORATED BY REFERENCE None. EXPLANATORY NOTE This Amendment No.1 on Form10-K/A (this “Amendment No.1”) amends the registrant’sAnnual Report onForm10-K for the fiscalyear ended January3, 2026that was originally filed with the Securities and ExchangeCommission (the “SEC”) on February27, 2026 (the “Original Form10-K”). This Amendment No.1 is being filed toinclude the information required in PartIII (Items 10, 11, 12, 13 and 14) of Form10-K that was previously omittedfrom the Original Form10-K in reliance upon General Instruction G(3)to Form10-K. General Instruction G(3)toForm10-K allows such omitted information to be filed as an amendment to the Original Form10-K or incorporated byreference from the registrant’s definitive proxy statement which involves the election of directors not later than120days after the end of the fiscalyear covered by the Original Form10-K. As of the date of this Amendment No.1,the registrant does not intend to file a definitive proxy statement