OpenAI has completed a deal to help employees sell shares in the company at a $500 billion valuation, propelling the ChatGPT owner past Elon Musk’s SpaceX to become the world’s largest startup. Current and former OpenAI employees sold about $6.6 billion of stock to investors including Thrive Capital, SoftBank, Dragoneer Investment Group, Abu Dhabi’s MGX and T. Rowe Price, a person familiar with the transaction said. That boosted the US company’s price tag well past its previous $300 billion level during a SoftBank-led financing round earlier this year.

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