"We have developed a reliable supply chain and continue to focus on identifying alternative sources to avoid any possible interruptions of service and product," the report said. Distribution The chain has one broadline distributor to provide virtually all its food distribution services in the United States. About 84% of the core food and beverage ingredients and 100% of its paper goods and chemicals — collectively representing approximately 49% of its purchases — were processed through that distributor for delivery to each unit. Shake Shack also uses 19 affiliated distribution centers to supply its domestic company-operated shacks. "Suppliers must meet certain criteria and strict quality control standards in the production and delivery of our food and other products," the report said. "We regularly evaluate our broadline distributor to ensure that the products we purchase conform to our standards and that the prices they offer are competitive."