Sigma Alimentos, S.A. de C.V., also known as Sigma or Sigma Alimentos, is a Mexican multinational food processing and distribution company headquartered in San Pedro, near Monterrey, Mexico. It produces and distributes refrigerated foods, mainly lunch meats, cheeses, and yogurts. It is one of the largest producers and distributors of refrigerated foods in Mexico, some of its well-known brands are Fud, Chen, San Rafael, Guten, and Yoplait.