AI BriefingYC estimated to hold 0.6% stake in OpenAI
Key point
John Gruber reported that Y Combinator's stake in OpenAI is about 0.6%.
Details
John Gruber reported that Y Combinator holds a portion of OpenAI equity, at a share of about 0.6%. Based on OpenAI's current valuation of $852 billion, that stake would be worth more than $5 billion.
The size of the stake is information that is difficult to confirm publicly, and Gruber explained that the estimate came from someone who knows several OpenAI investors. The quote in question was shared by Simon Willison on May 5, 2026.
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