Sigma Healthcare Limited operates as a retail pharmacy franchisor and pharmaceutical wholesale and distributor to community pharmacies primarily in Australia. It offers support services to a network of franchised retail pharmacies; third and fourth party logistics services to pharmaceutical manufacturers and other supplier partners; and health services. The company operates stores under the Chemist Warehouse, Amcal, and Discount Drug stores brand names. It also offers products through online. The company was founded in 1912 and is headquartered in Clayton, Australia.