Eaton Vance Tax-Managed Buy-Write Opp is a United States-based diversified, closed-end management investment company. Its primary investment objective is to provide current income and gains. The secondary objective of the fund is capital appreciation. Under normal market conditions, the Fund invests at least 80% of its total assets in a diversified portfolio of common stocks, designated segments of which seek to exceed the total return performance of the S&P 500 and the NASDAQ-100.