Tech giants make gains in this year's Fortune 500

Amazon CEO Jeff Bezos. Photo: Amanda Edwards/WireImage

Companies from all sectors — retail, tech, health care, telecommunications, and the auto industry — made an appearance near the top of this year's Fortune 500, but Walmart snagged the pole position for the sixth year in a row.

The big picture: Traditional corporate giants Exxon Mobil and Berkshire Hathaway rounded out the top three, but the most impressive gains came from the tech sphere. Apple had the highest profits of any U.S. company, Amazon romped into the top 10, and relative upstarts like Tesla, Netflix, and Nvidia all notched strong showings for investors.