In Brief 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 and change, according to a regulatory filing. That’s not a significant stock purchase, and certainly not for the billionaire board member, as Electrek noted in its reporting. It’s notable simply because a Tesla board member making a straight purchase of stock — no gifted stock, an exercise or conversion of derivative security, or right to buy an o ...