SpaceX's rapid inclusion in the Nasdaq-100 index on July 7, less than a month after going public, could create a new benchmark for mega IPOs. J.P. Morgan estimates the move could create about $4.3 billion in passive buying by funds tied to the index. Under Nasdaq's new fast-entry rule, the largest new listings can be reviewed on their seventh trading day if their full market value ranks among the top 40 current Nasdaq-100 companies. OpenAI and Anthropic could test how quickly AI giants enter passive portfolios after their IPOs. OpenAI has already filed confidentially for its IPO, targeting a valuation close to $1 trillion, with more than 900 million weekly ChatGPT users, more than 50 million paying consumers, and about $2 billion in monthly revenue (as of March 2026), though it is not expected to be profitable until 2030. Anthropic has also confidentially filed its IPO paperwork and raised $65 billion in new funding, giving it a valuation of $965 billion in May 2026. Investors still need to separate index inclusion from business quality and valuation risk.