5M accounts from Robinhood (robinhood.com) were exposed in this breach. Besides email addresses, it included some other data.
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Email addresses
In November 2021, the online trading platform Robinhood suffered a data breach after a customer service representative was socially engineered. The incident exposed over 5M customer email addresses and 2M customer names.
Source: Have I Been Pwned (CC BY 4.0)