The brother of an imprisoned former billionaire hedge fund founder was acquitted of conspiracy in New York on Tuesday.
Two dozen other defendants have pleaded guilty or were convicted in the case.
Federal Judge Naomi Reice Buchwald had dismissed the two most serious charges in May.
Prosecutors had alleged that Rengan Rajaratnam, 43, joined with his brother to cheat in the stock market in 2008 on the securities of two technology companies.
Defense attorney Daniel Gitner said the prosecution had "failed on every score" to prove its case.
After he was charged in the case last year, Rengan Rajaratnam came to the U.S. from Brazil, where he had been living.