CME Group U.S. equity index price limits (and corresponding CME and CBOT rules) are designed to coordinate with circuit breakers provisions as applied by the New York Stock Exchange (NYSE).
7%, 13%, and 20% price limits are applied to the futures fixing price and are effective from 8:30 a.m. CT – 3:00 p.m. CT. Mondays through Fridays.
5% up-and-down limits are effective 5:00 p.m. - 8:30 a.m. CT. Sundays through Fridays; and 3:00 p.m. - 4:00 p.m. CT, Mondays through Fridays. Between 3:00 p.m. - 4:00 p.m. the 5% price limit will not be allowed to breech the 20% daily limit.