Wal-Mart's 'hulking shadow' reigns over Whole Foods' smaller presence in grocery By: CNBC.com News June 21, 2017 at 14:06 PM EDT Wal-Mart should remain the world's biggest retailer and biggest grocer, Moody's tells its clients in a Wednesday note. Read More >> Related Stocks: Amazon.com Kroger Co Target Corp Wal-Mart Stores, Inc. Whole Foods Market