As a result, Amazon will now sit atop the Fortune 500 when the list of the largest companies is published in June, Fortune magazine reported. Walmart had been No. 1 for the past 13 years, but Amazon has been gaining rapidly. Amazon’s revenues were up 12.38% in fiscal 2025, which ended Dec. 31.

Most companies that have reached a $1 trillion market capitalization have been tech companies like Microsoft and Apple.

Amazon.com Inc. has officially dethroned Walmart Inc. as the biggest global company by revenue, a milestone attesting to the massive scale the e-commerce and cloud-computing giant has achieved since its humble beginnings in 1994 as an online bookseller in Jeff Bezos’ Seattle-area garage.

Here are five key things investors need to know to start the trading day.

Walmart had been at the top of the Fortune 500 for 13 years.