SpaceX made its public stock market debut Friday on Wall Street, making CEO Elon Musk the world’s first trillionaire.

Musk is already the world’s richest person. But after his company priced its blockbuster initial public offering at $135 a share and started trading publicly, the move boosted the technology mogul’s fortunes from an estimated $813 billion and sent SpaceX into the ranks of the world’s most valuable companies.