Wal-Mart Stores Inc.'s U.S. chief Bill Simon, who struggled to lift sales as it fought off competition from dollar stores and online retailers, will be leaving the company on Aug. 8, the retailer said Thursday.

Mr. Simon, 54, who joined the company in 2006, will be succeeded by Greg Foran, who took over the company's Asia division in April. Wal-Mart said it would announce Mr. Foran's successor at a later date.

Mr. Foran, 53, joined Wal-Mart in 2011 from Woolworths Ltd. in Australia and served as president of Wal-Mart China, where he presided over the country as it tangled with compliance and government regulation as it tried to open stores.

The company declined to make the executives available for comment and didn't give a reason for Mr. Simon's departure. It said Mr. Simon would stay on as a consultant with the company through Jan. 31 and see the company through the busy holiday period.

A straight-talking outsider who served various roles at Diageo PLC, PepsiCo Inc., and former Florida Gov. Jeb Bush's administration, Mr. Simon was among the favored candidates to succeed Mike Duke as CEO of Wal-Mart last year but was passed over for the job when company insider Doug McMillon assumed the role.

Mr. McMillon credited Mr. Simon with pushing Wal-Mart away from its large format stores in favor of smaller ones, as well as with integrating online sales with physical stores. Even so, Mr. Simon wasn't able to move the $279 billion U.S. division fast enough. In May, Wal-Mart's U.S. division reported its fifth straight quarter of negative U.S. sales, excluding newly opened or closed stores, and its sixth straight quarter of dwindling traffic.

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