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Robinhood Markets revealed Monday afternoon that an unauthorized party gained access to personal information for nearly one-quarter of the company’s nearly 20 million users, in one of the largest security breaches ever for the popular online brokerage. Is.

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one in blog post Late on Monday, Robinhood said an unauthorized third party “socially engineered” a customer support employee over the phone on the evening of November 3 and gained access to customer support systems.

The Menlo Park, Calif.-based trading firm didn’t provide additional details about how the intruder tampered with its customer support employee, but it believes the man obtained a list of the email addresses of about 5 million people. And the full names of about 2 lakh people.

“About 310 people had additional personal information — including names, dates of birth and zip codes — exposed in the breach,” Robinhood said, while about 10 customers had “more comprehensive account details exposed”.

Robinhood, who didn’t respond immediately Businesshala’ The request for comment, it also said that the unauthorized party sought extortion after infiltrating the brokerage and “immediately” notified law enforcement after the incident.

The company said it is in the process of notifying affected customers and believes no social security number, bank account number or debit card number was exposed.

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