Municipal Bonds » Nuveen Muni High Inc Opp CEF
Page updated 3/7/2026

The Nuveen Municipal High Income Opportunity Fund (ticker symbol: NMZ) is a closed-end fund (CEF) designed to generate high current income exempt from regular federal income taxes by primarily investing in a diversified portfolio of municipal bonds. NMZ employs a strategy that targets both investment-grade & below-investment-grade (high yield) municipal securities, providing broader opportunity for enhanced yield compared to typical muni funds that limit holdings to investment-grade only. The fund leverages its assets to potentially increase total returns, employing both fundamental credit research & active management to identify undervalued securities or sectors within the municipal market. Distribution income is generally tax-free, making NMZ particularly attractive to investors seeking income with favorable tax treatment—especially those in higher tax brackets. Additionally, the fund's use of leverage can amplify yield (as well as risk), and active portfolio management seeks to exploit pricing inefficiencies & credit opportunities not easily accessed by passive index funds. Compared to other closed-end fund options, NMZ stands out because of its flexible mandate across credit quality, its robust distribution rate—often higher than pure investment-grade muni CEFs—and its manager’s demonstrated expertise in navigating credit cycles and interest rate environments. The combination of tax-advantaged income, opportunistic credit exposure, and the potential for capital appreciation makes NMZ an appealing consideration for income-oriented investors willing to accept additional credit risk in pursuit of higher yields than what traditional municipal bond funds may offer.