John Gruber reveals that Y Combinator owns approximately 0.6% of OpenAI, valued at over $5 billion based on OpenAI's $852 billion valuation. This disclosure provides rare insight into the ownership structure of the AI giant, though the information comes from an unnamed source familiar with OpenAI investors. The stake represents a significant return on Y Combinator's early investment in the company.
Background
Y Combinator is a prominent startup accelerator that was an early investor in OpenAI, which has grown to become one of the most valuable AI companies in the world. Ownership stakes in private companies like OpenAI are typically not publicly disclosed.
- Source
- Simon Willison
- Published
- May 5, 2026 at 08:46 AM
- Score
- 7.0 / 10