FEDERALItem 1.05 · mandatoryMalwareHealthcareTechnologyHealthcareRansomwarePhishingData ExfiltratedData EncryptedRansom DemandedCustomer Data InvolvedMulti-Stage ChainPHIPIIIP / systemLowActive

iRhythm Holdings, Inc.

bd_796cd6508efce5fd · schema v1 · pii pii-v1

Severity

Low

Discovered

Jun 8, 2026

Filed

Jun 15, 2026

To disclose

7 days

Affected

Not disclosed

Confidence

66%

Full breach record for iRhythm Holdings, Inc. →

iRhythm Holdings, Inc. disclosed a material cybersecurity incident on June 15, 2026. On June 8, 2026, the company identified unauthorized activity involving data on third-party-hosted business applications. A threat actor demanded ransom for proprietary data, patient PHI, and personal information. The company confirmed data exfiltration via social engineering but stated patient safety and clinical systems were unaffected. The incident is ongoing.

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SEC clockMateriality determined Jun 10, 2026 → Filed Jun 15, 20265d ✓ SEC 4-day OK7 days discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

discovery → filing · 8 days

Jun 8, 2026

Discovered

Jun 10, 2026

Scope determined

Jun 15, 2026

Filed

vs. sector median

11 wks faster

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

Name: iRhythm Holdings, Inc.
norm: irhythm holdings
SEC CIK: 0001388658

Name: iRhythm Holdings, Inc.
norm: irhythm holdings
SEC CIK: 0001388658
Industry: HealthcarellmTechnologyllm

Discovered: Jun 8, 2026
Materiality determined: Jun 10, 2026
Notification sent: Jun 15, 2026
Affected individuals: Not disclosed
Data types: PHIPIIIP / system
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing Link
Threat actor: ExternalFinancial
Initial access: phishing_link

During the incident: Activated its cybersecurity response plan
Launched an investigation with the support of external advisors and cybersecurity experts
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 7 days(7 days from discovery to filing)
Compliance flags: SEC 4-day OK · 5d
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.
Clock breakdown: Statute Window Elapsed Threshold Status
SEC
Materiality determined: Jun 10, 2026
→ Filed: Jun 15, 2026
5d cal. 4 business days SEC 4-day OK

Statute	Window	Elapsed	Threshold	Status
SEC	Materiality determined: Jun 10, 2026 → Filed: Jun 15, 2026	5d cal.	4 business days	SEC 4-day OK

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/1388658/000138865826000055/irtc-20260610.htm
DisclosureLens renders the full SEC/HHS filing inline below from the originating regulator’s public record (§4.5 fair report privilege).
Filed at: Jun 15, 2026
Raw hash: 918979a834ee54a4b252c9bd136d6c15bdf0b4b55cd280ca9ba9d764a7e5f7d5

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Reporting entityiRhythm Holdings, Inc.

Victim entityiRhythm Holdings, Inc.

Incidentdiscovered Jun 8, 2026

Stated responseActivated its cybersecurity response plan

ComplianceSEC 4-day OK

Extraction provenanceno artifact recorded

Source provenancewww.sec.gov

Source filing