SpaceX CFO Bret Johnsen quietly engineered its historic IPO and became an overnight billionaire

While Elon Musk has extended his lead as the world’s richest man, the Space X IPO that made him a trillionaire has quietly boosted the wealth of thousands of his employees—from welders to his longtime lieutenants. Among that throng of people is Bret Johnsen, who has served as the company’s only chief financial officer and acted as the quiet architect behind the largest IPO in history. His stake in the company has now exceeded about $1.4 billion, meaning Space X going public made him a billionaire overnight. Musk brought on Johnsen as CFO in 2011 explicitly to guide SpaceX through its IPO. “His experience will be invaluable to SpaceX as we implement the financial standards and processes needed to allow for the possibility of becoming a public company,” Musk said in a statement at the time of Johnsen’s hiring. Since joining SpaceX, Johnsen has been the man working behind the scenes, making few public appearances, but leading the company through its transition from startup with a 10% chance of success—in Musk’s words—to a company bringing in $18.7 billion in revenue last year. Johnsen must now see SpaceX through its next era, delivering on its myriad promises surrounding satellites, internet, AI, and space travel. “I tell people it’s hard to be a space company and not have assured access to space,” Johnsen said in a recent interview with investor Gavin Baker. “We’re now lowest cost per kilogram to space ever in the industry. So it is definitely at the core of what we do, and it’s the enablement for all of the other businesses, whether it’s Starlink or direct to cell very soon or now AI compute.” Johnsen’s unique role following SpaceX’s IPO Prior to SpaceX’s IPO that raised $75 billion, Johnsen was already busy navigating the space company’s merger with xAI, Musk’s AI company, which it acquired in February in an all-stock transaction valued at $1.25 trillion. He also helped broker a deal with Anthropic, which agreed to lend a chunk of its com