213K accounts from BannerBit (bannerbit.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesPasswords
In approximately December 2018, the online ad platform BannerBit suffered a data breach. Containing 213k unique email addresses and plain text passwords, the data was provided to HIBP by a third party. Multiple attempts were made to contact BannerBit, but no response was received.
Source: Have I Been Pwned (CC BY 4.0)