The BXMD Index is designed to track the performance of a hypothetical covered call strategy that holds a long position indexed to the S&P 500 Index and sells a monthly out-of-the-money (OTM) S&P 500 Index (SPXSM) call option. The call option written is the strike nearest to the 30-Delta SPX call option at 10:00 a.m. CT on the Roll Date.