The ex-wife of Wall Street magnate Steven Cohen, founder of the $13 billion hedge fund SAC Capital Advisors, has filed a civil racketeering suit against Cohen in which she accuses him of committing insider trading violations.

The suit, according to The New York Times, was filed Wednesday in federal district court in Manhattan under a civil version of RICO laws used mostly against organized crime figures. The suit accuses Cohen of understating his income during divorce proceedings and hiding money from his ex-wife, Patricia. She is seeking $300 million. Her attorney, Paul Batista, did not immediately return a call seeking comment. An attorney for Cohen could not immediately be located.