MASI

masi-202601120000937556false00009375562026-01-122026-01-12

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 12, 2026

MASIMO CORPORATION

(Exact name of registrant as specified in its charter)

DE001-3364233-0368882

(State or other jurisdiction of incorporation)(Commission File Number)(IRS Employer Identification No.) 52 DiscoveryIrvine,CA92618 (Address of Principal Executive Offices)(Zip Code) (949) 297-7000

Registrant’s telephone number, including area code:

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2 (b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities Registered pursuant to Section 12(b) of the Act: Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, $0.001 par valueMASIThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933(§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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.☐

Item 2.02.Results of Operations and Financial Condition.

On January 12, 2026, Masimo Corporation (the “Company”) issued a press release announcing select preliminary financial results for the fourth quarter and full-year ended January 3, 2026. A copy of the press release is furnished as Exhibit 99.1 to this Current Report. The preliminary financial information presented in this press release is based on the Company’s current expectations and may be adjusted as a result of, among other things, completion of customary annual audit procedures. The Company’s management plans to discuss the Company’s complete fourth quarter and full-year 2025 financial results after the market closes on Thursday, February 26, 2026. In accordance with General Instructions B.2 of Form 8-K, the information in Item 2.02 of this Current Report on Form 8-K shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 7.01.Regulation FD Disclosure.

In connection with the Company’s participation at the 44th Annual J.P. Morgan Healthcare Conference on January 12, 2026, the Company’s Chief Executive Officer and EVP, Chief Financial Officer, will review select preliminary financial results for the fourth quarter and full-year 2025. In addition, the Company is making available to investors supplemental financial information for fiscal 2025, as well as a discussion of non-GAAP measures, adjustments and definitions pursuant to the materials furnished as Exhibit 99.2 to this Current Report. In accordance with General Instructions B.2 of Form 8-K, the information in Item 7.01 of this Current Report on Form 8-K shall not be deemed “filed” for purposes of Section 18 of the Exchange Act, or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01.Financial Statements and Exhibits.

(d) The following items are filed as exhibits to the Current Report on Form 8-K.

Exhibit No. Description 99.1Press Release, Dated January 12, 2025, Reporting Select Preliminary 2025 Financial Results

99.2Masimo 2025 Supplemental Earnings Presentation

104Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, Masimo Corporation has duly caused this report

masi-202511040000937556false00009375562025-11-042025-11-04

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 4, 2025

MASIMO CORPORATION

(Exact name of registrant as specified in its charter)

DE001-3364233-0368882

(State or other jurisdiction of incorporation)(Commission File Number)(IRS Employer Identification No.) 52 DiscoveryIrvine,CA92618 (Address of Principal Executive Offices)(Zip Code) (949) 297-7000

Registrant’s telephone number, including area code:

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2 (b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities Registered pursuant to Section 12(b) of the Act: Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, $0.001 par valueMASIThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933(§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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.☐

Item 2.02.Results of Operations and Financial Condition.

On November 4, 2025, Masimo Corporation (the “Company”) issued a press release announcing its financial results for the quarter ended September 27, 2025. A copy of the press release is furnished as Exhibit 99.1 to this Current Report. In accordance with General Instruction B.2 of Form 8-K, the information in Item 2.02 of this Current Report on Form 8-K shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 7.01.Regulation FD Disclosure.

In connection with the Company’s conference call scheduled to be held on November 4, 2025, the Company’s Chief Financial Officer will review supplemental information regarding the Company’s financial results for the third quarter 2025, as well as the Company’s updated outlook for the remainder of fiscal 2025. The Company is making available to investors supplemental financial information by fiscal quarter for fiscal years 2022, 2023 and 2024, along with the first, second and third quarters of 2025, pursuant to the materials furnished as Exhibit 99.2 to this Current Report. In accordance with General Instruction B.2 of Form 8-K, the information in Item 7.01 of this Current Report on Form 8-K shall not be deemed “filed” for purposes of Section 18 of the Exchange Act, or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01.Financial Statements and Exhibits.

(d) The following items are filed as exhibits to the Current Report on Form 8-K.

Exhibit No. Description 99.1Press Release, Dated November 4, 2025, Reporting Third Quarter 2025 Financial Results

99.2Masimo Third Quarter 2025 Supplemental Presentation to Earnings Press Release

104Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, Masimo Corporation has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

MASIMO CORPORATION

Date: November 4, 2025By:/s/ MICAH YOUNG

Micah Young Executive Vice President & Chief Financial Officer (Principal Financial Officer)

masi-202508050000937556false00009375562025-08-052025-08-05

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 5, 2025

MASIMO CORPORATION

(Exact name of registrant as specified in its charter)

DE001-3364233-0368882

(State or other jurisdiction of incorporation)(Commission File Number)(IRS Employer Identification No.) 52 DiscoveryIrvine,CA92618 (Address of Principal Executive Offices)(Zip Code) (949) 297-7000

Registrant’s telephone number, including area code:

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2 (b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities Registered pursuant to Section 12(b) of the Act: Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, $0.001 par valueMASIThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933(§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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.☐

Item 2.02.Results of Operations and Financial Condition.

On August 5, 2025, Masimo Corporation (the “Company”) issued a press release announcing its financial results for the quarter ended June 28, 2025. A copy of the press release is furnished as Exhibit 99.1 to this Current Report. In accordance with General Instructions B.2 of Form 8-K, the information in Item 2.02 of this Current Report on Form 8-K shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 7.01.Regulation FD Disclosure.

In connection with the Company’s conference call scheduled to be held on August 5, 2025, the Company’s Chief Financial Officer will review supplemental information regarding the Company’s financial results for the second quarter 2025, as well as the Company’s updated outlook for the remainder of fiscal 2025. The Company is making available to investors supplemental financial information by fiscal quarter for fiscal years 2022, 2023 and 2024, along with the first and second quarters of 2025, pursuant to the materials furnished as Exhibit 99.2 to this Current Report. In accordance with General Instructions B.2 of Form 8-K, the information in Item 7.01 of this Current Report on Form 8-K shall not be deemed “filed” for purposes of Section 18 of the Exchange Act, or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01.Financial Statements and Exhibits.

(d) The following items are filed as exhibits to the Current Report on Form 8-K.

Exhibit No. Description 99.1Press Release, Dated August 5, 2025, Reporting Second Quarter 2025 Financial Results

99.2Masimo Second Quarter 2025 Supplemental Presentation to Earnings Press Release

104Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, Masimo Corporation has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

MASIMO CORPORATION

Date: August 5, 2025By:/s/ MICAH YOUNG

Micah Young Executive Vice President & Chief Financial Officer (Principal Financial Officer)