Nuveen S&P 500 Dynamic Overwrite Fund is a closed-ended equity indexed mutual fund managed by Nuveen Fund Advisors LLC and Nuveen Asset Management, LLC. The fund primarily invests in the public equity markets of the United States, targeting stocks of large cap companies operating across diversified sectors. It also invests in financial derivatives such as call options, seeking to replicate the performance of the S&P 500 Index.