By my math Greg Brockman is worth about 5x Sam Altman, because Altman holds no OpenAI equity

To my knowledge, a list of the top AI billionaires doesn't exist. It's something I'm often curious about so I built out net-worth estimates for everyone whose fortune comes mainly from AI, and dug into what that wealth looks like. OpenAI is particularly interesting because Greg Brockman ($28.5B on my list), is second only to a Chinese chip founder most people have never heard of. That isn't my guess.

Altman is further down ($5.5B) and he famously holds no direct OpenAI equity. His single largest asset is a roughly one-third stake in the fusion startup Helion, which tripled to a $15.5B valuation in a June 2026 round and is now worth around $5B to him. Add $1B to $1.5B in Stripe, Reddit, and other holdings and that's how I arrived at $5.5B. For reference, real-time trackers had him near $3.4B and Forbes marked him at $6.5B, so I land in between.

The person running OpenAI is worth a fraction of his own president, and a fraction of what senior researchers who joined years ago now hold on paper. I guess I'd be fine with that arrangement too if I was already a billionaire.