Over the past year, the BlackRock co-founder orchestrated the sales of Bank of Americaís stake in the company, as well as a portion of PNCís position. She also spearheaded
the end-of-2009 acquisition of Barclays Global Investors, which was a major contributor in more than doubling profits.
The list is compiled by FORTUNE editors, who consider four criteria: the size and importance of the womanís business in the global economy, the health and direction of the
business, the arc of the womanís career (resume and runway ahead), and societal and cultural influence.