The three competing companies are Coca-Cola ( who owns Coke, Diet Coke and Fanta ) with 44% of the market share, PepsiCo ( who owns Pepsi, Diet Pepsi, Mountain Dew and Diet Mountain Dew ) with 36% of the market share, and Dr. Pepper Snapple Group. ( who owns Dr. Pepper and Diet Dr. Pepper ) with 17% of the market share.