In just two years Chobani has become the market leader in yogurt sales, and its all based off their Greek yogurt. Two years after initially hitting markets Chobani now sells the most greek yogurt in the U.S. Now industry giant Danone (NYSE:BN) is fighting to take it number 1 spot back. The world's largest yogurt maker has recently released it own greek yogurt, Dannon Oikos. After an ad for the yogurt starring Greek American actor John Stamos aired during the Super Bowl, Oikos' sales grew by 165% through May. Even though Chobani's sales continued to grow 20% in the same time period, it has lost market share for 8 straight quarters.