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Y Combinator's 0.6% stake in OpenAI valued at over $5 billion

By PulseAugur Editorial · [1 sources] ·

Y Combinator holds a stake of approximately 0.6% in OpenAI, which is valued at over $5 billion given OpenAI's current $852 billion valuation. This information was reportedly shared by an individual familiar with OpenAI's investors. The article also references other recent AI developments, including a refactor of LLM 0.32a0, the history of an OpenAI-Microsoft AGI clause, and the DeepSeek V4 model. AI

IMPACT Provides insight into the financial structure and valuation of leading AI labs like OpenAI.

RANK_REASON Significant funding information regarding a major AI lab's valuation and investor stake.

Read on Simon Willison →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Y Combinator's 0.6% stake in OpenAI valued at over $5 billion

How we ranked this

Signal score
0 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Significant
Significant funding information regarding a major AI lab's valuation and investor stake.
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
Topics
funding, other
Editorial topic classification. Feeds into how the story surfaces on /topic/<slug> hub pages and into the per-entity coverage mix.
AI-industry relevance
High
Clearly on-topic for AI-industry coverage.
Story freshness
145 days old
Aged out of breaking-news scoring windows; ranking reflects the durable signal from the full source set.

Full methodology in our editorial standards.

COVERAGE [1]

  1. Simon Willison TIER_1 Deutsch(DE) ·

    Quoting John Gruber

    <blockquote cite="https://daringfireball.net/2026/05/y_combinators_stake_in_openai"><p>So it’s well known that Y Combinator owns <em>some</em> stake in OpenAI. But how big is that stake? This seems like devilishly difficult information to obtain. I asked around and a little birdi…

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