Hackers with Wall Street expertise have stolen merger-and-acquisition information from more than 80 companies for more than a year, according to security consultants who shared their findings with law enforcement.

A group dubbed FIN4 by researchers at FireEye Inc. has been tricking executives, lawyers and consultants into providing access to confidential data and communications, and probably using the information for insider trading, FireEye said in a report today. The hackers' sophistication suggests they've worked in the financial sector, Jen Weedon, FireEye's manager of threat intelligence, said in an interview.

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