Groupon Inc. GRPN, +13.15% shares slipped 1.5% on Wednesday after the online marketplace announced its chief executive and chief operating officer are leaving. Aaron Cooper, Groupon’s president of North America, has been appointed interim CEO by the company’s board of directors to replace Rich Williams. COO Steve Krenzer is also no longer serving in his role. Williams and Krenzer will continue as employees of the company. Groupon shares are down 74% in the last year. The broader S&P 500 index is down 12% in the last year.