Nuveen S&P 500 Dynamic Overwrite Fund is a diversified closed-end management investment company. Its investment objective is to seek attractive total returns with less volatility than the S&P 500 Index by investing in a U.S. equity portfolio that seeks to substantially replicate the price movements of the S&P 500 Index, as well as selling call options on 35%-75% of the notional value of the Fund's equity portfolio (with a 55% long-term target) in an effort to enhance the Fund's risk-adjusted returns.