Express Scripts Holding Company is looking for another chief financial officer less than a year after Cathy R. Smith joined the pharmacy benefits manager from retail giant Walmart. Express Scripts said that Smith no longer serves as executive vice president and CFO, but she will continue to work for the St. Louis company into the first quarter to help it transition. Express Scripts also named James M. Havel as executive vice president and interim chief financial officer while it searches for a permanent replacement for Smith. The company also reaffirmed its 2014 profit guidance and said its board authorized the repurchase of up to an additional 65 million shares, bringing the total to 205 million shares. Shares of Express Scripts have climbed 18% so far this year.