27.9M accounts from Public Business Data (bvdinfo.com) were exposed in this breach. Besides email addresses, it included dates of birth, job titles and names.
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Dates of birthEmail addressesJob titlesNamesPhone numbersPhysical addresses
In approximately August 2021, hundreds of gigabytes of business data collated from public sources was obtained and later published to a popular hacking forum. Sourced from a customer of Bureau van Dijk's (BvD) "Orbis" product, the corpus of data released contained hundreds of millions of lines about corporations and individuals, including personal information such as names and dates of birth. The data also included 28M unique email addresses along with physical addresses (presumedly corporate locations), phone numbers and job titles. There was no unauthorised access to BvD's systems, nor did the incident expose any of their or parent company's Moody's clients.
Source: Have I Been Pwned (CC BY 4.0)