0001266585 2026-10-20 2026-10-20 0001266585 1 2026-10-20 2026-10-20 iso4217:USD pure 0001266585 EX-FILING FEES 424B5 N-2 Nuveen Municipal High Income Opportunity Fund false Equity Common Shares $0.01 par value per share true 419950000 0.00008700 36535.65 419950000 36535.65 0 0 36535.65 The Registrant is relying upon Rule 457(c) under the Securities Act of 1933 (“Securities Act”) to calculate the registration fee. The maximum aggregate offering price is estimated solely for purposes of determining the registration fee based on the average of the high and low sales prices of the shares of Common Shares, as reported by the New York Stock Exchange on October 16, 2026, in accordance with Rule 457(c) under the Securities Act. The proposed maximum offering price per security will be determined from time to time by the Registrant in connection with the sale by the Registrant of the securities registered under this Registration Statement. N/A N/A false 333-277778