Douglas McMillon, President and CEO at Walmart (NYSE:WMT), disclosed an insider sell on September 30, according to a recent SEC filing. What Happened: McMillon’s decision to sell 29,124 shares of Walmart was revealed in a Form 4 filing with the U.S. Securities and Exchange Commission on Monday. The total value of the sale is $2,348,635. The latest update on Tuesday morning shows Walmart shares up by 0.19%, trading at $80.91. All You Need to Know About WalmartWalmart serves as the preeminent retailer in the United States, with its strategy predicated on superior operating efficiency and offerin…