FEDERALItem 8.01 · voluntaryHackingTechnologyInformationLowContained

MASIMO CORPORATION

bd_cd3e5e145112eded · schema v1 · pii pii-v1

Severity

Low

Discovered

Apr 27, 2025

Filed

May 27, 2025

To disclose

4 weeks

Affected

Not disclosed

Confidence

67%

Full breach record for MASIMO CORPORATION →2 incidents on file

Masimo Corp (CIK 937556) filed a supplemental 8-K on May 27, 2025, updating a previously reported cybersecurity incident. The company identified unauthorized activity on its on-premise network on April 27, 2025. Masimo activated incident response protocols, engaged third-party cybersecurity professionals, and notified law enforcement. The company states that at the present time it does not expect the incident to materially impact fiscal 2025 revenue.

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Incident timeline

discovery → filing · 4 weeks / 30 days

Apr 27, 2025

Discovered

May 27, 2025

Filed

vs. sector median

14 wks faster

Tracked as a single-filing incident — the only disclosure on record for this event so far.ConfirmedView incident

Name: MASIMO CORPORATION
norm: masimo
SEC CIK: 0000937556

Name: MASIMO CORPORATION
norm: masimo
SEC CIK: 0000937556
Industry: Technologyllm

Discovered: Apr 27, 2025
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: —
Attack vector: Unauthorized Access

During the incident: Activated its incident response protocols
Implemented containment measures
Commenced an investigation
Working to assess, mitigate, and remediate the incident with the assistance of third-party cybersecurity professionals
Notified and coordinated with law enforcement
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 4 weeks(30 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filing

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statementThis record

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://www.sec.gov/Archives/edgar/data/937556/000093755625000086/masi-20250527.htm
DisclosureLens renders the full SEC/HHS filing inline below from the originating regulator’s public record (§4.5 fair report privilege).
Filed at: May 27, 2025
Raw hash: 1bd54eeff589e83c10b79dcc71d4be3ae53f1607cede979d6a485b78f45a04d2

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Reporting entityMASIMO CORPORATION

Victim entityMASIMO CORPORATION

Incidentdiscovered Apr 27, 2025

Stated responseActivated its incident response protocols

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancewww.sec.gov

Source filing