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BXY.X is the CBOE S&P 500 BuyWrite Index
BXM is the CBOE BuyWrite Monthly Index
The Cboe S&P 500 BuyWrite Index (BXM) is a benchmark index designed to track the performance of a hypothetical buy-write strategy on the S&P 500 Index.
Announced in April 2002, the BXM Index was developed by the Cboe in cooperation with Standard & Poor's. To help in the development of the BXM Index, the Cboe commissioned Professor Robert Whaley to compile and analyze relevant data. The BXM is a passive total return index based on (1) buying an S&P 500 stock index portfolio, and (2) "writing" (or selling) the near-term S&P 500 Index (SPXSM) "covered" call option, generally on the third Friday of each month. The SPX call written will have about one month remaining to expiration, with an exercise price just above the prevailing index level (i.e., slightly out of the money). The SPX call is held until expiration and cash settled, at which time a new one-month, near-the-money call is written. Please visit the BXM FAQ for more information about the construction of the index.
Experienced investors can ask their brokers about the possibility of engaging in an S&P 500 buy-write strategy by investing in stocks and SPX options.