Maag Grupp Maag Grupp is 100% Estonian capital based and incorporates several subsidiaries in food business. is 100% Estonian capital based and incorporates several subsidiaries in food business. The company was established in 1996. Today, Maag Grupp Maag Grupp is 100% Estonian capital based and incorporates several subsidiaries in food business. has developed into a group of companies active in production and sale of food products.