T-MOBILE USA, INC. — July 2021 breach

Clustered 7 filings across 7 jurisdictions · filing window Aug 19, 2021 → Aug 31, 2021. View entity profile → Other incidents for this victim →

⚠ 1 cross-filing discrepancy →Merge100%

Determination

Confirmed

Members

7 filings

States

Affected · reported

53,800,000

First → last filing

Aug 19, 2021 → Aug 31, 2021

Merge confidence

100%

incident inc_1938c9b855a64b84 · merged by deterministic · confidence 100%

Confirmed breach. Merged as one breach: 7 regulatory filings. The filings describe unauthorized access. Intrusion Jul 19, 2021–Jul 22, 2021, discovered Aug 17, 2021 — the first regulatory filing landed 2 days later. 53,800,000 individuals reported across the linked filings. Data reported: Government ID, Identity (basic), Financial account, and 2 more. Notifications rolled out on a 12-day schedule across 7 filings beginning Aug 19, 2021. Each member filing remains the legal record for its jurisdiction.

Litigation Timing

Supplemental

Notification delay

2days

Discovered → first regulatory filing

Discovery variance

0days

Range of discovered_at dates across filings

Filing span

12days

Time between earliest and latest filing

Not recorded for this incident

Leak precedence · Materiality delta · SEC filing delay — no leak-site claim in this cluster; no SEC 8-K in this cluster.

Regulatory clocksDelaware✓ DE credit monitoring dueWashington✓ WA AG ≤30dCalifornia✓ CA 60-day OK · 2dMassachusetts✓ MA credit monitoring dueOregon✓ OR AG ≤45dSouth Carolina✓ SC CRA notice dueFull clock table in Litigation Timeline

No cross-filing comparison data available for this incident.

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