Nuveen Municipal High Income Opportunity Fund Overview
Pro stress-test →Nuveen Municipal High Income Opportunity Fund is a closed-end fixed income mutual fund that primarily invests in investment grade tax-exempt municipal securities. Its primary objective is to provide high current income exempt from regular federal income tax, with a secondary objective to seek attractive total return.
Strategic Profile
Pro stress-test →The fund uses leverage and may invest up to 75% of managed assets in municipal securities rated Baa/BBB or lower by rating organizations, including below-investment grade securities. In January 2026, the fund approved mergers of three state-specific municipal income funds, which are expected to improve secondary-market liquidity and potentially provide higher net earnings through greater scale.
Competitive Landscape
Pro stress-test →NMZ competes with other closed-end municipal bond funds and open-end municipal mutual funds from providers including BlackRock, Invesco, Virtus, and other fixed-income specialists. The fund's advantage lies in its leverage strategy, large credit research team, and institutional management. As of April 2026, NMZ showed outperformance versus the Bloomberg Municipal Total Return Index and High Yield Municipal benchmarks.
Industry Context
Nuveen Municipal High Income Opportunity Fund operates in Closed-end municipal bond funds.
Key facts
Founded: 2003 · Headquarters: Chicago, US · Employees: N/A · Revenue: $111.18M (FY2025) · Market cap: N/A