Ackman, Valeant team up to bid for Allergan in unusual pairing
April 21, 2014 at 20:41 PM EDT
BOSTON/NEW YORK (Reuters) - Activist investor William Ackman teamed up with Canadian drugmaker Valeant Pharmaceuticals International Inc to make a joint run at buying wrinkle-treatment maker Allergan Inc, according to security filings on Monday.