Shares of GNC Holdings (GNC) - Get GNC Holdings, Inc. Class A Report plunged Thursday after reporting a 12% decrease in same store sales. For the fourth quarter, the company reported a net loss of $433.4 million on revenue of $570 million. Adjusted earnings per share stood at $0.07 for the quarter. Plus, GNC suspended its quarterly dividend of 20 cents a share. Year to date, the stock is down 36%. TheStreet's Scott Gamm reports from Wall Street.