Pam Nicholson

Nicholson runs the largest car rental company in the world with a global fleet of 2 million vehicles—more than twice that of her next largest competitor. Despite consumers’ growing use of car-sharing and ride-hailing apps, the company, which rents cars through Enterprise, Alamo, and National Car Rental, grew revenue by 8% to $24 billion last year. Enterprise has also made some forward-looking moves this year, including entering a deal with Voyage, an autonomous-vehicle startup, to service and maintain its fleet.