Judith McKenna

McKenna is reshaping Walmart’s international portfolio, which last year generated more than $121 billion in sales. The Brit has doubled down on the behemoth’s business in Mexico, Canada, and India, while exiting Argentina, shedding part of the business in Japan, and selling off its stake in Asda in the U.K. Insiders say she and Sam’s Club CEO Kathryn McLay (No. 24) are both contenders to someday lead the company.

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