OpenAI is now the world's most valuable private company at $500 billion

Group 1 - OpenAI has surpassed SpaceX to become the largest startup and most valuable private company globally, with a valuation of $500 billion [1] - The company authorized a secondary share sale of $10.3 billion, ultimately selling $6.6 billion to investors including Softbank and T. Rowe Price [1] - This valuation increase from $300 billion to $500 billion positions OpenAI ahead of SpaceX, valued at $400 billion, and ByteDance at $220 billion [1] Group 2 - OpenAI is transitioning to a Public Benefit Corporation (PBC) controlled by its nonprofit arm, which holds an equity stake of over $100 billion [2] - Elon Musk, a co-founder of OpenAI, is opposing this transition in court, claiming it violates the company's founding mission [2] - The PBC structure is expected to attract more investors by removing caps on financial returns, as OpenAI aims to raise significant funds for data center expansion [3]