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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 after the company's valuation soared to $2 trillion.