AI Briefing
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Y Combinator's Stake in OpenAI

·2026.05.05 09:00

Key point

Y Combinator holds approximately 0.6% equity in OpenAI, valued at over $5 billion.

Details

Amid ongoing controversy over Sam Altman's trustworthiness, the fact that Y Combinator (YC) holds equity in OpenAI has emerged as a new point of contention. YC co-founder Paul Graham has commented on Altman's character on multiple occasions, but his economic interests have not been sufficiently disclosed.

OpenAI was founded in 2016 through YC Research, a subsidiary of YC, while Altman was serving as YC's chairman. As a result, Altman is understood to hold an indirect stake through YC in addition to his direct equity.

According to industry sources, Y Combinator holds approximately 0.6% of OpenAI's equity. Given that OpenAI's valuation stands at $852 billion, this stake is worth a substantial amount exceeding $5 billion.

It has been pointed out that such significant economic interests could influence the public assessments that key figures like Paul Graham make regarding Altman's leadership and trustworthiness.

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