OpenAI has completed a $6.6 billion secondary share sale, allowing employees to sell stock at a $500 billion valuation, marking it as the most valuable privately held company in the world. The sale reflects strong investor confidence, as participation was lower than the authorized amount, which is viewed positively within the company. This move is part of a broader trend among startups to offer secondary sales to retain talent while remaining private.

Revolut has rejected a secondary share sale proposal that would have valued the company at $65 billion, indicating a strategic move to control its valuation narrative ahead of a possible IPO. The company typically targets a ticket size of $500 million for secondary market activities to maintain equity control and prevent market saturation.