Nuveen S&P 500 Buy-Write Income Fund (the Fund) is a closed-end fund. The Fund's investment objective is to provide a high level of current income and gains. The Fund invests its managed assets in a diversified equity portfolio that seeks to substantially replicate price movements of the S&P 500 Index. The Fund also uses an index option strategy of writing (selling) index call options in seeking to moderate the volatility of returns relative to an all equity portfolio. It...