Historical Month-end Prices - Spreadsheet with Closing ... - CBOE This spreadsheet is updated about once a year, and is based on data from secondary ... 4, CBOE S&P 500 BuyWrite, S&P 500 Total Return, S&P 500, CBOE S&P 500 ... CBOE S&P 500 95-110 Collar Index, CBOE S&P 500 2% OTM BuyWrite ...