Sam Altman is the CEO of OpenAI, the company behind ChatGPT, and one of the most consequential figures in the artificial intelligence era. A Stanford dropout who built his first startup at 19, Altman ran Y Combinator for five years before going all-in on OpenAI's mission to build safe superintelligence. He survived a dramatic 5-day ouster from his own company in 2023, returned to thunderous employee support, and has since steered OpenAI to a $300 billion valuation. He holds no equity in OpenAI, yet built a $3+ billion personal fortune through early bets on Reddit, Stripe, Airbnb, and a cluster of deep-tech moonshots.
On March 31, 2026, OpenAI closed the largest private funding round in history — $122 billion in committed capital at a post-money valuation of $852 billion. Anchored by Amazon ($50B), Nvidia ($30B), and SoftBank ($30B), with continued participation from Microsoft and a sweeping syndicate of global institutions, the round dwarfs every prior private tech raise and cements OpenAI as the world's most valuable startup by a wide margin. The company is generating $2 billion in monthly revenue, counting 900 million weekly ChatGPT users, and is widely expected to pursue an IPO.