Nuveen S&P 500 BuyWrite Income Fund is a closed-end equity indexed mutual fund that aims to replicate the performance of the S&P 500 Index. The fund invests in stocks of companies across diverse sectors, proportionally weighted to match the index. It also employs a buy-write strategy, selling index call options to generate additional income.

Managed by Nuveen Investments and Gateway Investment Advisers, this fund offers investors exposure to large-cap U.S. equities with potential for enhanced income. The buy-write strategy aims to provide a more stable return profile compared to direct equity investments, making it suitable for investors seeking income and moderate growth potential.