US STOCKS-S&P, Dow falter after six days of gains as Walmart weighs By: Reuters: Company News February 20, 2018 at 11:47 AM EST * Dow off 0.53 pct, S&P down 0.19 pct, Nasdaq up 0.39 pct (Changes comment, adds details, updates prices) Read More >> Related Stocks: Amazon.com Apple Costco Wholesale Home Depot Kroger Co Microsoft NVIDIA Corp Nxp Semiconductors Qualcomm, Inc. Snap Inc Target Corp Wal-Mart Stores, Inc.