Diet Coke moves past Pepsi into No. 2 spot By: MarketWatch March 17, 2011 at 12:41 PM EDT Coca-Cola’s diet soda edges regular Pepsi for second place in the U.S. carbonated soft-drink market for 2010, according to a trade publication. Read More >> Related Stocks: Coca-Cola Company Dr. Pepper Snapple Group PepsiCo