; Founded in 1966. Cosi is a chain of restaurants that offers foods and beverages. Its restaurants serve pizzas. Soups. Bagels. Gourmet beverages and desserts. The Chain's restaurants also serve HAND-TOSSED salad and mozzarella sandwiches. Cosi also provides franchise options. AS well gift and store value cards. The chain operates more than 100 restaurants in 16 states throughout the united...