Incidents involving:

Yahoo!

Data breachResolvedSeptember 22, 2016

Yahoo data breaches (3 billion accounts)

Two separate breaches — disclosed in 2016 but stretching back to 2013 and 2014 — exposed every Yahoo account in existence. Three billion accounts: the largest single-company data exposure in history.

Victim: Yahoo!
Loss: $470.0M
Records: 3.00B

Data breachResolvedJuly 11, 2012

Yahoo data breach (2012)

In July 2012, Yahoo! had their online publishing service "Voices" compromised via a SQL injection attack. The breach resulted in the disclosure of nearly half a million usernames and passwords stored in plain text.

Victim: Yahoo
Records: 453.4K