A federal appeals court rejected a one-time Florida billionaire's bid to revive his $800 million lawsuit accusing Citigroup Inc (C.N) of fraudulently hiding its exposure to subprime and other toxic mortgages, inducing him to hold on to shares he otherwise would have sold. The 2nd U.S. Circuit Court of Appeals in Manhattan on Friday said Citigroup and former officials, including two chief executives Charles Prince and Vikram Pandit, were not liable to trusts and corporate entities overseen by Arthur Williams and his wife. Lawyers for the Williamses did not immediately respond to requests for comment. Citigroup ... (full story)