Win some, lose some — see how stock prices have fared when companies had a female CEO take the helm.
Data reflects period ending Sept. 11, 2012.
Fortune's Most Powerful Women
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How we pick the Power 50
The list is compiled by FORTUNE editors, who consider four criteria: the size and importance of the woman's business in the global economy, the health and direction of the business, the arc of the woman's career (resume and runway ahead), and societal and cultural influence.
For the latest on the most influential women in business, philanthropy, government, and the arts, like us on Facebook. 
