One of the biggest oil market manipulation cases undertaken by regulators is entering a new phase in which a judge will mediate settlement talks, three years after the case was launched.

The Commodity Futures Trading Commission case against the U.S. unit of Optiver Holding BV, a Netherlands-based hedge fund, has been referred to U.S. Magistrate Judge Theodore Katz for settlement, according to a June 15 filing in the U.S. district court in Manhattan.

(Reporting by Jonathan Spicer, editing by Gerald E. McCormick)