The shuffle underscores the rivalry between the two retailers, particularly as Walmart expands its advertising and third-party marketplace businesses.

On Tuesday, we'll get the latest from names including Pfizer, Pepsi, Merck, Advanced Micro Devices, and Chipotle . While ...

Amazon reported Q4 results on Thursday, with sales coming in ahead of estimates. But shares dropped as capex guidance surged ...

Amazon stock tanked over 10% in after-hours trading Thursday. That happened right after the company posted weaker-than-expected profit numbers and shocked the entire market with a wild $200 billion ...