The Nuveen S&P 500 Dynamic Overwrite Fund of Benef Interest (ticker: SPXX) is a mutual fund that seeks to provide investors with exposure to the S&P 500 index while also utilizing a dynamic overwrite strategy. This strategy involves writing call options on the underlying index in order to generate additional income for the fund. The fund's objective is to provide long-term capital appreciation and current income through a combination of equity investments and option writing. It is designed for investors seeking a diversified approach to investing in the S&P 500 index with the potential for enhanced returns through the use of options.