Sigma Healthcare Limited is an Australian, ASX-listed company with a focus on the pharmacy industry. The company has pharmacy operations in retail, wholesale and distribution. From its head office in Clayton, Victoria, Sigma manages over 1,200 branded and independent pharmacies. Sigma Healthcare owns Australian retail pharmacy brands: Amcal, Chemist Warehouse, Discount Drug Stores and Guardian Pharmacy. The company also has a presence in the hospital pharmacy services, contract logistics, dose administration aids and other healthcare service adjacencies. Wikipedia