sentences:  The suit claimed that JP Morgan as Amaranth Advisors's clearing broker use their position to prevent Amaranth Advisors from derisking their exposure from its natural-gas derivatives portfolio by preventing the portfolio from being sold to first Goldman Sachs and later Citadel LLC.In December 2012, the New York State Court of Appeals upheld an earlier dismissal of the case.During the collapse of Amaranth Advisors, Centaurus was credited as being one of the major players on the other side of their position.