McKesson is one of the largest healthcare companies in the U.S. It is a global leader in healthcare supply chain management solutions, retail pharmacy, healthcare technology, community oncology, and specialty care. It caters to more than 50% of U.S. hospitals and 20% of physicians, and delivers one-third of medications used daily in North America. The company has operations in more than 16 countries. McKesson works with Life Sciences companies, manufacturers, providers, pharmacies, governments, and other healthcare organizations to help develop and deliver advanced medical treatments. It also provides pharmaceutical distribution services that are customizable and scalable for hospitals and health systems. McKesson operates the fourth largest pharmacy chain with over 17,000 owned and banner pharmacies and more than 5,000 retail pharmacies. Commencing in the first quarter of 2019, McKesson changed its operating structure into three reportable segments: U.S. Pharmaceutical and Specialty Solutions (~78% of 2019 revenues), European Pharmaceutical Solutions (~12%), Medical-Surgical Solutions (~4%) and others (~6%).