https://finance.yahoo.com/news/former-yahoo-ceo-apologizes-data-152829874.html > "Unfortunately, while all our measures helped Yahoo successfully defend against the barrage of attacks by both private and state-sponsored hackers, Russian agents intruded on our systems and stole our users’ data." > Verizon, the largest U.S. wireless operator, acquired most of Yahoo Inc's assets in June, the same month Mayer stepped down. Verizon disclosed last month that a 2013 Yahoo data breach affected all 3 billion of its accounts, compared with an estimate of more than 1 billion disclosed in December.