Tesla board member and Airbnb co-founder Joe Gebbia acquired about 4,000 shares of the automaker's stock, a purchase that has a value of about $1 million

The launch of a $25,000 autonomous vehicle would be a huge inflection point for Tesla's recently stagnating growth. And according to many estimates, a robotaxi service could add hundreds of billions of dollars to the company's valuation. The problem is that Tesla's already priced at a premium, trading at 9.4 times sales even after the correction.