2025-05-06 MASIMO CORP Cybersecurity Incident

Page last updated on June 9, 2025

MASIMO CORP initially disclosed a cybersecurity incident in an SEC 8-K filing on 2025-05-06 16:10:12 EDT.

Company Summary

Masimo Corporation, a medical technology company, develops, manufactures, and markets noninvasive patient monitoring products.

Incident Details

Material: Unknown
Is Breach: Unknown
Records Compromised: Unknown
Data Types Impacted: No Data Types Tracked (yet)

Compromised Date:
Detected Date: 2025-04-27
Disclosure Date: 2025-05-06
Contained Date:
Recovered Date:

Attack Goal: Unknown

Costs: No Costs Tracked (yet)

Filings

8-K filed on 2025-05-06

MASIMO CORP filed an 8-K at 2025-05-06 16:10:12 EDT
Accession Number: 0001104659-25-045035

Item 8.01 Other Events.

On April 27, 2025, Masimo Corporation (the “Company” or “we”) identified unauthorized activity on the Company’s on-premise network. Upon detection, we activated our incident response protocols and implemented containment measures, including proactively isolating impacted systems. We promptly commenced an investigation and are actively working to assess, mitigate, and remediate the incident with the assistance of third-party cybersecurity professionals. The Company has also notified and is coordinating with law enforcement.

As a result of the incident, certain of the Company’s manufacturing facilities have been operating at less than normal levels, and the Company’s ability to process, fulfill, and ship customer orders timely has been temporarily impacted. The Company has been working diligently to bring the affected portions of its network back online, restore normal business operations and mitigate the impact of the incident.

The investigation of the incident remains ongoing, and the full scope, nature, and impact of the incident are not yet known. At this time, the Company believes that the incident appears unrelated to and is not affecting the Company’s cloud-based systems.

8-K filed on 2025-05-27

MASIMO CORP filed an 8-K at 2025-05-27 09:00:17 EDT
Accession Number: 0000937556-25-000086

Item 7.01 Regulation FD Disclosure.

Management of Masimo Corporation (the “Company”) intends to participate in discussions with investors during the upcoming week at which the Company intends to re-affirm the updated financial outlook for the remainder of fiscal 2025 that it provided on May 6, 2025.

At the present time, the Company does not expect the cybersecurity-related incident reported under Item 8.01 of Form 8-K on May 6, 2025, which is further updated in Item 8.01 below, to materially impact the Company’s revenue for fiscal year 2025, or to prevent the Company from fulfilling customer orders received to date or meeting seasonal demand.

The Company maintains cybersecurity insurance, and expects that the majority of out-of-pocket remediation costs incurred by the Company in connection with the incident will be covered by such insurance, and that any such costs will be non-recurring in nature.

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 8.01 Other Events.

As previously reported under Item 8.01 of Form 8-K on May 6, 2025, on April 27, 2025, the Company identified unauthorized activity on the Company’s on-premise network and, upon detection, activated its incident response protocols and implemented containment measures. The Company promptly commenced an investigation and has been actively working to assess, mitigate, and remediate the incident with the assistance of third-party cybersecurity professionals. The Company has also notified and coordinated with law enforcement.

At this time, the Company’s manufacturing operations are running at near full capacity, and the Company’s critical order taking, distribution and shipping systems are fully operational. The Company is continuing to optimize these systems to ensure that any delayed orders are being processed in a timely manner.

Company Information