UPDATE 1-Ackman apologizes for Valeant losses, calls bet a mistake
March 29, 2017 at 20:11 PM EDT
BOSTON, March 29 (Reuters) - Billionaire hedge fund manager William Ackman has apologized to clients for betting on Valeant Pharmaceuticals International Inc, telling them he was "deeply and profoundly sorry" for losing so much of their money on the investment.