OpenAI aims to expand its secondary market stock offering to a staggering $10.3 billion, an increase of $6 billion from its initial plan. This substantial boost will provide eligible current and former employees with approximately $4 billion in new stock sale opportunities. According to insiders, this move is anticipated to elevate the company's valuation to $500 billion, aligning with market expectations. Earlier this year, OpenAI's valuation stood at $300 billion during its latest funding round.