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10. O'Reilly Automotive
10. O'Reilly Automotive
2010 Fortune 500 rank: 429
2009 profit growth: 65.1%
2009 revenue growth: 35.5%

CEO since 2005: Gregory L. Henslee

Last year's big task for O'Reilly chief Gregory Henslee was integrating the 1,350 CSK stores he bought in 2008.

These were not mere pit stops: Many locations closed for a week or more to remove inventory, upgrade computer systems, and install new inventory. But the $1 billion merger is revving O'Reilly's top and bottom lines, with sales up 36%, to $4.8 billion and earnings up 65%, to $307 million.

NEXT: 11. Erie Insurance Group

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Last updated April 28 2010: 12:37 PM ET
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