Shares in Quebec-based Valeant Pharmaceuticals, once one of Canada's most valuable companies, plummeted 13 per cent on Tuesday. March 14, 2017William Ackman, founder and CEO of hedge fund Pershing Square Capital Management, has sold his stake in Valeant Pharmaceuticals. June 14, 2016Joe Papa was named Valeant Pharmaceuticals chief executive officer in April 2016. Oct. 30, 2015Valeant cuts ties with mail-order pharmacy company Philidor, after a report from Citron Research accused the company of "fraud." Valeant shares climb more than 10 per cent to an all-time high of $95.82 in afternoon trading on the TSX.

Source: CBC News March 14, 2017 18:11 UTC