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Weekly breach brief

Data breaches in the week of 13–19 April 2026

51 data breaches on the tracker, 51 confirmed by the organisation or a regulator.

Breaches
51
Notices in CA and WA
21
Ransomware claims
218
Largest
13.5M

The largest

  1. McGraw Hill 13,500,136 accounts
  2. Amtrak 2,147,679 accounts
  3. Restaurant Management Co. of Wichita, Inc. 120,416 people United States
  4. TransGlobal Insurance Agency 71,597 people United States
  5. Goodwin University, Inc. 56,156 people United States
  6. Ameriprise Financial, Inc.  48,034 people United States

Every breach this week, by country

United States 49

Country being checked 2

  • McGraw Hill 16 April 2026 · 13,500,136 accounts
  • Amtrak 17 April 2026 · 2,147,679 accounts

Ransomware claims

Gangs named 218 organisations on their leak sites this week, against 166 the week before. A claim is the gang’s word, not a confirmed breach.

Every week

Follow the brief: one entry a week (Atom). The 2026 report has the year so far.

From the data breach tracker: official notices, breach databases and the news, every fact with its source. Open data (CC BY 4.0) · How the tracker works · Official registers · Corrections and changes · Found a mistake? Tell us and we correct it.