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Weekly breach brief

Data breaches in the week of 27 Apr – 3 May 2026

48 data breaches on the tracker, 48 confirmed by the organisation or a regulator.

Breaches
48
Notices in CA and WA
8
Ransomware claims
308
Largest
8.2M

The largest

  1. Pitney Bowes 8,243,989 accounts
  2. ADT 5,488,888 accounts
  3. ZenBusiness 5,118,184 accounts
  4. Marcus & Millichap 1,837,078 accounts
  5. Aman 215,563 accounts
  6. Sandhills Medical Foundation, Inc. 169,017 people United States

Every breach this week, by country

United States 43

Country being checked 5

Ransomware claims

Gangs named 308 organisations on their leak sites this week, against 138 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.