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47. Cristina Stenbeck
Cristina Stenbeck
Country: Sweden
Previous rank: New

Stenbeck, whose top lieutenant at the media and telecom conglomerate also is a woman, last year expanded the value of Kinnevik's assets 18%, to $7.6 billion. The coming months could prove more challenging for the 31-year-old executive: Metro, the free-newspaper chain Kinnevik owns, continues to lose money, and topsy-turvy financial markets threaten to upend some of her bets on emerging markets.

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Last updated September 29 2008: 1:21 PM ET
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