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Re:Former Equifax Manager Charged with Insider Trading by JumpCrisscross on Thursday June 28, 2018 @03:17PM (#17419674)
> How do they know who's friends with whom?

After any corporate action, the SEC (and various other agencies) trace back through trade records to look for suspicious trades. Family members are a matter of public record. And friends are now announced on LinkedIn, Twitter, Facebook, et cetera.

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