Yahoo CEO Marissa Mayer

What’s Yahoo worth now that Alibaba is public?

Investments in Alibaba and Yahoo Japan are worth about $45 billion. That’s more than the U.S. company’s total $39 billion market value.

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2014’s Most Powerful Women on Twitter

How top female business leaders in Fortune’s annual list of the Most Powerful Women rank on Twitter.

IBM CEO Ginni Rometty at the 2013 Fortune Most Powerful Women Summit in Washington, D.C.

The women who STEM-ed their way to power

The women at the top of the 2014 Fortune Most Powerful Women list have a serious thing for engineering. And physics. And math.