Quoting John Gruber

📰 Simon Willison's Blog

Learn how to estimate stake valuations in private companies like OpenAI and why it matters for investors and startups

intermediate Published 5 May 2026
Action Steps
  1. Research the current valuation of a private company like OpenAI
  2. Estimate the stake percentage owned by an investor like Y Combinator
  3. Calculate the value of the stake by multiplying the valuation by the percentage
  4. Verify the information through reputable sources or insiders
  5. Apply this knowledge to inform investment or partnership decisions
Who Needs to Know This

Investors, entrepreneurs, and startup teams can benefit from understanding stake valuations to make informed decisions

Key Insight

💡 Understanding stake valuations is crucial for investors and startups to make informed decisions

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Estimate stake valuations in private companies like OpenAI to inform investment decisions 💡

Key Takeaways

Learn how to estimate stake valuations in private companies like OpenAI and why it matters for investors and startups

Full Article

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<
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