100 Fastest-Growing rank: 21 (Previous rank: N.A.)
CEO: Tim Cook
Address: 1 Infinite Loop, Cupertino, California

It may be a no-brainer, but Apple is on a roll. Last year, it launched two products to great success: the iPhone 4 sold 1.7 million units during its first three days on shelves; the iPad moved nearly 14.7 million units by the end of the year. That momentum carried over into 2011. During the company's most recent quarter, iPhone sales grew 142%, while iPad sales expanded a whopping 183% thanks to a major hardware update. All that contributed to profits of $7.3 billion on revenues of $28.6 billion, a record on both fronts.

Last updated September 12 2011: 10:49 AM ET
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