Silgan Holdings Inc. (Silgan) is a manufacturer of rigid packaging for shelf-stable food and other consumer goods products.is a packaging company that manufactures products for food and other consumer goods. It produces steel and aluminum containers for human and pet food and general line products; metal, composite and plastic closures for food and beverage products; and plastic containers, tubes and closures for personal care, food, health care, pharmaceutical, household and industrial chemical, pet care, agricultural, automotive and marine chemical products. Silgan supplies the products directly to the customers and through a network of supply channels. Geographically, the company serves in the US, Europe, Canada, and other countries. It operates manufacturing plants in North America, Europe, Asia and South America. Silgan is headquartered in Stamford, Connecticut, the US.