Quoting John Gruber

# A quote from John Gruber Source: [https://simonwillison.net/2026/May/5/john-gruber/](https://simonwillison.net/2026/May/5/john-gruber/) 5th May 2026 > So it’s well known that Y Combinator owns*some*stake in OpenAI\. But how big is that stake? This seems like devilishly difficult information to obtain\. I asked around and a little birdie who knows several OpenAI investors came back with an answer: Y Combinator owns about 0\.6 percent of OpenAI\. At OpenAI’s current[$852 billion valuation](https://openai.com/index/accelerating-the-next-phase-ai/), that’s worth over $5 billion\. —[John Gruber](https://daringfireball.net/2026/05/y_combinators_stake_in_openai),Y Combinator’s Stake in OpenAI Posted[5th May 2026](https://simonwillison.net/2026/May/5/)at 12:46 am ## Recent articles - [Notes on the xAI/Anthropic data center deal](https://simonwillison.net/2026/May/7/xai-anthropic/)\- 7th May 2026 - [Live blog: Code w/ Claude 2026](https://simonwillison.net/2026/May/6/code-w-claude-2026/)\- 6th May 2026 - [Vibe coding and agentic engineering are getting closer than I'd like](https://simonwillison.net/2026/May/6/vibe-coding-and-agentic-engineering/)\- 6th May 2026 This is a**quotation**collected by Simon Willison, posted on[5th May 2026](https://simonwillison.net/2026/May/5/)\. [john\-gruber40](https://simonwillison.net/tags/john-gruber/)[y\-combinator59](https://simonwillison.net/tags/y-combinator/)[ai2008](https://simonwillison.net/tags/ai/)[openai417](https://simonwillison.net/tags/openai/)