Amazon stock has been a middling performer among its Big Tech peers for much of the year, but it's got some mojo now.

What Happened in Markets Today Amazon plans a massive expansion of its grocery-delivery business, a move to boost growth in one of the few retail arenas in which it doesn’t yet have a dominant ...

Discover why Amazon.com, Inc.'s growth strategies and valuation position it as a top investment pick over Walmart Inc. Click ...