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Businessweek.com set out this summer to find the most promising entrepreneurs aged 25 or under. For our sixth annual roundup, we narrowed the finalists from hundreds of suggestions contributed by readers on companies that range from tech startups to clothing retailers to medical device makers. Flip through this slide show for a look at each, then vote for the business that you feel holds the most promise. Voting ends on Oct. 21. We'll announce the five companies with the most votes on Oct. 28.
Note: Revenues are self-reported. To be considered, founders had to be 25 or under when the nomination period closed in late July.