Cboe S&P 500 Iron Butterfly Index (BFLY) www.cboe.com/BFLY

The Cboe S&P 500 Iron Butterfly Index is designed to track the performance of a hypothetical option trading strategy that 1) sells a rolling monthly at-the-money (ATM) S&P 500 Index (SPX) put and call option; 2) buys a rolling monthly 5% out-of-the-money (OTM) SPX put and call option to reduce risk; and 3) holds a money market account invested in one-month Treasury bills, which is rebalanced on the option roll day and is designed to limit the downside return of the index.

The BFLY Index rolls on a monthly basis, typically every third Friday of the month.

Cboe data is compiled for the convenience of site visitors and is furnished without responsibility for accuracy and is accepted by the site visitor on the condition that transmission or omissions shall not be made the basis for any claim demand or cause for action. Your use of Cboe data is subject to the Terms and Conditions of Cboe's Websites. Please see BFLY info on risk disclosures, prices, intellectual property and methodology changes at www.cboe.com/micro/BFLY.