Amaranth Advisors LLC was an American multi-strategy hedge fund founded by Nicholas M. Maounis and headquartered in Greenwich, Connecticut. At its peak, the firm had $9.2 billion in assets under management before collapsing in September 2006, after losing in excess of $6 billion on natural gas futures. Amaranth Advisors collapse is one of the biggest hedge fund collapses in history and at the time (2006) largest known trading losses.