Closing some Sam's Club stores allows Walmart to focus on what works, says ex-US chief By: CNBC.com News January 12, 2018 at 10:11 AM EST The closure or conversion of 10 percent of Sam's Club locations is a good move for Walmart, says Bill Simon. Read More >> Related Stocks: Costco Wholesale TJX Companies Ulta Beauty Inc Wal-Mart Stores, Inc.