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22. Medco Health Solutions
22. Medco Health Solutions
2010 Fortune 500 rank: 35
2009 profit growth: 16.1%
2009 revenue growth: 16.7%

CEO since 2003: David B. Snow, Jr.

Medco chief David Snow says his company won $10 billion in new business in 2010.

An obvious draw: Although prescription costs rose about 8% last year, Medco's big corporate clients averaged just 2% increases, while heavy users of the company's mail-order services saw costs fall.

In 2010, it'll be all about discerning the effects of the health care legislation, which Snow calls "the biggest unknown."

NEXT: 23. CVS Caremark

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Last updated April 28 2010: 12:37 PM ET
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