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Stephen Buyer, a Republican representative from 1993 to 2011, was accused in court papers of engaging in insider trading during the $26.5 billion merger of T-Mobile and Sprint.
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Kodak and Sen. Richard Burr, R-N.C., are facing high-profile insider trading investigations, but data show the Securities and Exchange Commission pursued far fewer insider trading cases last year.
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Law enforcement officials charged 32 people in connection with an alleged international hacking and insider-trading scheme they say defrauded investors of more than $30 million.
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Federal authorities say hackers from Ukraine and securities traders in the U.S. teamed up to steal more than 150,000 confidential press releases before they became public information.