Early SpaceX investor Ron Baron wasn't taking profits during its blockbuster stock-market debut. He was buying more. The billionaire investor said Baron Capital purchased an additional $1 billion worth of SpaceX shares Friday during the company's initial public offering , increasing the firm's position in Elon Musk 's rocket and satellite company to roughly $25 billion. The purchase marks a fresh vote of confidence from one of SpaceX's earliest and most enthusiastic institutional backers, even