Twilio Set to Join List of 500 Big U.S. Companies

Twilio is set to join the S&P 500, according to an Oct. 1, 2026 S&P Global listing. The S&P 500 is a list of 500 big U.S. companies that many savings funds copy. When a company is added, those funds must buy its shares, which can crowd buying around the start date. The exact date is still to come.