Tesla is now more valuable that the world's top seven car makers combined at $615bn and is the biggest entrant to the S&P 500 EVER - but experts warn the stock is too high and could plummet at any moment
Tesla joined the S&P 500 on Monday at $665 a share, making it the most valuable new entrant to the stock index ever
The company is currently worth some $615bn - more than Ford, Honda, BMW, GM, Daimler, Volkswagen and Toyota combined
But analysts say the stock is in bubble territory and likely to burst at any minute
Part of the reason is Apple's announcement earlier this week that it is producing its own self-driving car