Ken Griffin's US hedge fund Citadel made $16bn in profit after fees last year — the largest annual profit ever made by a hedge fund manager, an investor has estimated.

In a report published on 23 January by fund of funds LCH Investments, Citadel topped the top 20 hedge fund manager's list beating John Paulson's 2007 $15bn gain, which has until now been described as "the greatest trade ever," said Rick Sopher, LCH chairman.