Diamond Foods is an American packaged food company based in Stockton, Californiaspecializing in marketing nuts, particularly walnuts. Its brands include Kettle Brand chips, Emerald snack nuts, Pop Secret popcorn, and Diamond of California snack and culinary nuts.
The company was founded in 1912 as Diamond Walnut Growers, Inc., a member-owned Californian agricultural cooperative association. In July 2005, Diamond Walnut Growers converted to a Delaware corporation and initial public offering of stock as Diamond Foods.