Fund Description: Nuveen Municipal High Income Opportunity Fund is an exchange-traded closed-end fund or a closed-end ETF which is officially described in its prospectus as a diversified, closed-end management investment company. INVESTMENT OBJECTIVE: The Fund's primary investment objective is to provide high current income exempt from regular federal income tax. The Fund's secondary investment objective is to seek attractive total return consistent with its primary objective. FUND STRATEGY: Under normal circumstances, the Fund will invest its Managed Assets in a portfolio of municipal securities that pay interest that is exempt from regular federal income tax. Under normal circumstances, the Fund expects to be fully invested in such tax-exempt municipal securities. Up to 30% of the Fund's Managed Assets may be invested in municipal securities that pay interest that is taxable under the federal alternative minimum tax applicable to individuals. The Fund will invest at least 50% of its Managed Assets in municipal securities that at the time of investment are investment grade quality. The Fund may invest up to 50% of its Managed Assets in municipal securities that at the time of investment are rated below investment grade quality. FUND MANAGEMENT: The Fund's investment advisor is Nuveen Advisory Corp.