Despite Big Blue’s seemingly unstoppable revenue slide—it hasn’t reported a year-over-year sales increase in 13 quarters, and 2014 revenue fell 6% to $92.8 billion—Rometty remains atop IBM, though no longer the MPW list. Since taking on the CEO role in 2012, Rometty has shelled out $8.5 billion for more than 30 companies (the latest: Merge Healthcare, snapped up in August for $1 billion). She is restructuring the company to focus on technologies such as Watson, a cognitive computing system, and the cloud.