Walmart is an omnichannel powerhouse that excels in strategy execution.Is now a good time to buy stock in Walmart (WMT 0.42%)? Shares of the world's largest retailer are up more than 24% year to date as of market close on Dec. 29. The company is not only beating the S&P 500 this year, but it's also outpaced the index over the past five years. That's no easy feat. While some may argue that Walmart stock is overpriced because it's trading at a forward price-to-earnings ratio of more than 36 and is approaching ...