The $25.5 Billion Nobody Saw Coming
Published October 13, 2026
Greg Brockman, OpenAI's co-founder and president, debuted on the 2026 Forbes 400 at number 45 with a fortune of $25.5 billion — the richest newcomer on the list. He owns just under 3% of OpenAI and, testifying under oath in May 2026, disclosed his stake was worth close to $30 billion. He now ranks ahead of his own CEO: Sam Altman, who holds no direct OpenAI equity, missed the list entirely.
Each September, Forbes publishes its ranking of the 400 richest Americans, and the 2026 edition contained one of the strangest entries in the list's history. Greg Brockman, the 37-year-old co-founder and president of OpenAI, appeared for the first time at number 45 with an estimated fortune of $25.5 billion. He was the richest newcomer on the entire list, slotted just behind Nike co-founder Phil Knight and just ahead of Rupert Murdoch. The odd part was not the number. It was that the company behind the fortune has no stock ticker, no earnings calls, and no public share price — and that Brockman's boss, chief executive Sam Altman, did not make the list at all.
The fortune came to light in a courtroom. In May 2026, Brockman was testifying in Elon Musk's lawsuit against OpenAI, and under questioning he agreed that his stake in the company was worth close to $30 billion — a figure that had never been publicly disclosed before, as Reuters reported at the time. He also told the court he had never personally invested any money in OpenAI; the shares were compensation and early-founder equity that had compounded as the company's valuation exploded. Forbes' analysts estimated his holding at just under 3%, and the math is straightforward: at the $852 billion post-money valuation set by the company's $122 billion funding round in March 2026, a 3% stake is worth about $25.6 billion, neatly matching the list's estimate.
Brockman's path to that number started with dropping out — twice. Raised by two doctors in a small North Dakota town, he left Harvard, transferred to MIT, and left that too after a few months. In 2010 he became the fourth employee and chief technology officer of a payments startup called Stripe. When he left Stripe in 2015 to co-found OpenAI with Altman, Musk and others, he kept a Stripe holding that Forbes now values at about $471 million — itself a fortune, and it accounts for less than 2% of his total. For nearly a decade he stayed in the background while public attention focused on Altman, doing the unglamorous work of running a company that was quietly growing into one of the most valuable private enterprises on earth.
The moment that tested his conviction came in November 2023, when OpenAI's board suddenly fired Altman. Brockman resigned within hours, in solidarity. At the time, quitting looked like it could cost him everything: departing startup employees routinely forfeit unvested equity, and the company's entire future was in doubt. He returned within days once Altman was reinstated, and the episode became the defining gamble of his career. The shares he might have walked away from are the shares now valued above $20 billion.
The contrast with Altman is what made the Forbes debut a story in itself. Altman reportedly holds no direct equity in OpenAI — an unusual arrangement for a startup CEO — and Forbes puts his net worth at about $3.3 billion, well short of the $4.4 billion cutoff for the 2026 list, a record high. So the president is worth nearly eight times the chief executive. It is a quirk of OpenAI's strange corporate history: the company's capped-profit structure, its origins as a nonprofit, and side arrangements — including, disclosed in the trial, a 2017 stake Altman gave Brockman in his personal family office — produced a cap table where the co-founder's equity ran circles around the CEO's portfolio.
There is one large asterisk. Brockman's $25.5 billion is a modeled fortune, not a bank balance. OpenAI is private; the valuation comes from negotiated funding rounds, and he cannot simply sell his shares on an exchange. The company has run employee tender offers — including a $7 billion buyback at the $852 billion valuation — to give workers some liquidity, but the headline number moves wherever the next financing round moves it. The lesson is double-edged: early equity in the right company can produce wealth that no salary could touch, but until a company goes public, even a $25.5 billion fortune is partly an estimate. Forbes measures what the market would pay. The market hasn't been asked yet.
The lesson: Early equity in the right company can outrun any salary — but until the company goes public, even a $25.5 billion fortune is an estimate, not a balance.
Source: original reporting · How we source stories