According to people familiar with the matter, OpenAI has completed a transaction that allows current and former employees to sell approximately $6.6 billion worth of company stock at a valuation of $500 billion. This secondary sale allows the ChatGPT maker to surpass Musk's SpaceX to become the world's most valuable startup. Previously, in a $40 billion round of financing led by SoftBank Group, OpenAI was valued at $300 billion. People familiar with the matter said that as part of the transaction, OpenAI employees sold shares to a group of investors including Thrive Capital, SoftBank, Dragoneer Investment Group, Abu Dhabi's MGX, and T. Rowe Price. (Jinshi)