Henry Schein

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Founded by its namesake as a Queens, N.Y., pharmacy in 1932, the company is now one of the world's largest distributors of dental supplies and other medical goods, operating in more than 30 countries. An ever-present on Fortune's list of the World's Most Admired Companies, it is considered by many in its sector as a leader in social responsibility. With $10.1 billion in sales last year, Henry Schein moved up six spots on this year's Fortune 500 list.