3.08M accounts from MGM Resorts (mgmresorts.com) were exposed in this breach. Besides email addresses, it included dates of birth, names and phone numbers.
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Dates of birthEmail addressesNamesPhone numbersPhysical addresses
In July 2019, MGM Resorts discovered a data breach of one of their cloud services. The breach included 10.6M guest records with 3.1M unique email addresses stemming back to 2017. The exposed data included email and physical addresses, names, phone numbers and dates of birth and was subsequently shared on a popular hacking forum in February 2020 where it was extensively redistributed. The data was provided to HIBP by Under The Breach.
Source: Have I Been Pwned (CC BY 4.0)