» more from Leadership

5. Hewlett-Packard

CEO: Margaret "Meg" Whitman
Company value: $52.4 billion

Meg Whitman spent 10 years as president and CEO of eBay before moving on to lead HP, the hardware and software company that provides products, technologies, solutions and services to businesses and consumers. Whitman, a Republican, made a bid for governor of California in 2010, spending $178 million but losing to Jerry Brown. It was the highest amount ever spent in a statewide campaign in California history.

Noah Berger | Bloomberg | Getty ImagesInset: Robyn Beck | AFP | Getty Images