Shares of everyone's favorite cream-filled cakes, Hostess Brands (NASDAQ: TWNK), the second-largest producer of sweet baked goods in the United States, are down 10% Friday morning. This came a day after the announcement its chief executive officer would be retiring effective March 1, 2018, or sooner if a replacement is appointed.Dean Metropoulos, executive chairman of the board, commented in a press release:On behalf of the Board and management team I would like to thank Bill for his significant contributions to Hostess.