New York hedge fund manager Steven Cohen's ex-wife has filed a suit against him and his firm SAC Capital Advisors claiming that he engaged in insider trading during the 1980s and hid assets during their divorce proceedings, according to the Wall Street Journal.

The document is quoted as saying: "Defendant Cohen's fraudulent concealment of his activities from Ms Cohen was consistent with a pattern of highly secretive conduct that has long characterised his business and personal affairs."

A spokesman for SAC is quoted as saying: "These are ludicrous allegations made by a former spouse that are entirely without merit."