Christine Day
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MPW global rank: 45
Company: Lululemon

Lululemon's stock has returned over 200% since Day became CEO in 2008, and the high-end yoga apparel company is now one of the world's fastest growing lifestyle brands (revenue, which hit $1 billion in 2011, is expected to increase 36% this year). Day, who spent 20 years at Starbucks prior to taking the Lululemon gig, added 15 new stores this year, including 11 in the US and one in Australia, taking the number of corporate-owned locations to 189. The next frontier: Asia.

  @FortuneMagazine - Last updated September 21 2012 01:20 PM ET
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