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McKesson Corporation is an American publicly traded company that distributes pharmaceuticals and provides health information technology, medical supplies, and health management tools. The company delivers a third of all pharmaceutical products used or consumed in North America and employs over 80,000 employees. With $308.9 billion in 2024 revenue, it is the ninth-largest company by revenue in the United States and the nation's largest health care company. The company is headquartered in Irving, Texas. It is a component of the S&P 500 and is listed on the New York Stock Exchange, where it is traded under the ticker symbol "MCK". Throughout the COVID-19 pandemic, McKesson was a key vaccine distributor, serving as the US government's centralized distributor for hundreds of millions of COVID-19 vaccine doses and ancillary supply kits for over a billion doses.