Judith McKenna

McKenna was promoted in February from Walmart U.S. COO to head of international—a business that, like everything else at Walmart, is massive. Its $118 billion in revenue would land it at No. 44 on the Global 500 if it were a stand-alone company. McKenna is overseeing a radical transformation of the portfolio, including Walmart’s acquisition of an approximately 77% stake in India’s largest online retailer, Flipkart. The $16 billion deal is the biggest ever in both the pure e-commerce sector and Walmart’s history.

Read: Meet the Woman Running Walmart's Biggest Deal Ever.