Also: All the news and watercooler chat from Fortune.

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

Also: All the news and watercooler chat from Fortune.

Amazon’s revenue lead over Walmart caps a broader shift as both giants lean on AI.

A snapshot of the e-commerce giant in 2009, when it was 130 on the Fortune 500, shows how it got to No. 1.