When OWN flagged this year, Winfrey moved in as CEO and chief creative officer of her new cable network. Sheís added 20 new advertisers for 2012. But with Oprah not in living rooms
every day, courtesy of her former daily syndicated talk show, her influence has waned.
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.