Marissa Mayer

TechCrunch Disrupt NY 2014 - Day 3
NEW YORK, NY - MAY 07: Yahoo! CEO, Marissa Mayer speaks at TechCrunch Disrupt NY 2014 - Day 3 on May 7, 2014 in New York City. (Photo by Brian Ach/Getty Images for TechCrunch)Brian Ach 2014 Getty Images
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Since Mayer took over in July 2012, she has spent almost $1.4 billion on 37 acquisitions. Yet Yahoo's sales fell 6% in 2013, dropping it from the Fortune 500. The bright spot: its 24% stake in Alibaba, the Chinese e-commerce giant that's slated to go public tomorrow.