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Buyer was a Republican from Indiana in the U.S. House of Representatives between 1993 and 2011 before working as a corporate consultant.
Prosecutors said at a trial that began on March 1 that Buyer bought Sprint stock after learning from a T-Mobile executive that the telecommunications companies were in merger talks in 2018 and engaged in another insider trading scheme in 2019.
Buyer took the stand at trial and denied trading on inside information. His attorney did not immediately return a request for comment on Friday.
The former congressman was found guilty on four counts of securities fraud. Judge Richard Berman will hold a sentencing hearing on July 11.