2009 rank: 33
Age: 49
Wagner led BlackRock's $13.5 billion purchase of Barclays Global Investors in 2009, creating the world's largest asset-management organization, with $3.151 trillion. She also sits on a new five-person oversight team that includes CEO Larry Fink.
NEXT: Deirdre Connelly
Last updated September 30 2010: 2:47 PM ET