As of September 12, 2016, Nuveen Municipal Market Opportunity Fund, Inc. has been acquired by Nuveen AMT-Free Quality Municipal Income Fund. Nuveen Municipal Market Opportunity Fund, Inc. is a closed-ended fixed income mutual fund launched by Nuveen Investments, Inc. The fund is co-managed by Nuveen Fund Advisors LLC and Nuveen Asset Management, LLC. It invests in the fixed income markets of the United States. The fund also invests some portion of its portfolio in derivative instruments. It invests in undervalued municipal securities and other related investments the income, exempt from regular federal income taxes that are rated Baa or BBB or better and having an average maturity of around 20 years. The fund benchmarks the performance of its portfolio against the Standard & Poor’s (S&P) National Municipal Bond Index. Nuveen Municipal Market Opportunity Fund, Inc. was formed on March 21, 1990 and is domiciled in the United States.