The Nuveen S&P 500 Buy-Write Income Fund, previously known as the Nuveen Equity Premium Income Fund, operates as a closed-end, equity-indexed mutual fund. It was established by Nuveen Investments, Inc. and is jointly managed by Nuveen Fund Advisors LLC and Gateway Investment Advisers, LLC. This fund primarily allocates capital to U.S. public equities, targeting companies across a broad range of industries. A core component of its investment strategy involves utilizing index call options. Its principal aim is to closely track the performance of the S&P 500 Index by investing proportionally to its constituent weighting. Inaugurated on July 23, 2004, the fund is domiciled in the United States.