2.46M accounts from Factual (factual.com) were exposed in this breach. Besides email addresses, it included employers, phone numbers and physical addresses.
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Email addressesEmployersPhone numbersPhysical addresses
In March 2017, a file containing 8M rows of data allegedly sourced from data aggregator Factual was compiled and later exchanged on the premise it was a "breach". The data contained 2.5M unique email addresses alongside business names, addresses and phone numbers. After consultation with Factual, they advised the data was "publicly available information about businesses and other points of interest that Factual makes available on its website and to customers".
Source: Have I Been Pwned (CC BY 4.0)