T-MOBILE US, INC.
bd_da083d3cb67a25f9 · schema v1 · pii pii-v1
Full breach record for T-MOBILE US, INC. →T-Mobile's 10-K Item 1C cybersecurity disclosure references two previously disclosed cybersecurity incidents: an August 2021 cyberattack and a January 2023 cyberattack. Both resulted in class action lawsuits, mass arbitration claims, and (for the January 2023 incident) regulatory inquiries. The Company states it has incurred and may continue to incur significant costs that may have a material adverse effect on its business. No new incident is reported in this filing; details on attack vectors, affected counts, and data types are not provided in this Item 1C narrative.
Source provenance
- Source URL
- https://www.sec.gov/Archives/edgar/data/1283699/000128369924000008/tmus-20231231.htm
DisclosureLens renders the full SEC/HHS filing inline below from the originating regulator’s public record (§4.5 fair report privilege).
- Filed at
- Feb 2, 2024
- Raw hash
- 92a8e7c1a413a258b0a983dbfe40fef6115339b040e00e8ea8e044f655abd6f2
Source filing
Reporting entity
- Name
- T-MOBILE US, INC.norm: t mobile us
Victim entity
- Name
- T-MOBILE US, INC.norm: t mobile us
- SEC CIK
- 1283699
- Industry
- Telecom & Mediallm
Incident
- Discovered
- —
- Materiality determined
- —
- Notification sent
- —
- Affected individuals
- Not disclosed
- Data types
- —
- Attack vector
- Unknown
- Threat actor
- External
- Regulator citations
- Regulatory inquiries resulting from the January 2023 cybersecurity incident
Compliance
- Compliance flags
- — (clock not assessable for this source)
Extraction provenance
- Status
- No extraction artifact recorded for this disclosure.