Top 10 Most Valuable Car Companies Published on May 6, 2021 in Top 10 by The Car Guide There are several ways to rank the world’s top automakers. Production and sales volumes are obviously the main yardsticks, but these numbers don’t tell the whole story. Inspired by Tesla’s meteoric rise since 2020, The Car Guide presents you the top 10 most valuable car companies on the planet by market capitalization.Also: New Cars and Trucks with the Highest Residual Value in 2021Also: Tesla Model Y Lands in Canada, Brand Now No.1 in Market Value Of course, the rankings can change from one week to another—heck, even from one day to another. We used data from companiesmarketcap.com as of May 6, 2021. Note that Honda, Hyundai and Ferrari barely miss the top 10.