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NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND (NMZ) Form 424B3 — Oct 2, 2026

$NMZForm 424B3Filed Oct 2, 2026, 9:33 AM ET0001999371-26-021913Original filing

Nuveen Municipal High Income Opportunity Fund (NYSE: NMZ) filed a prospectus supplement dated October 2, 2026, amending the Use of Proceeds section of its April 4, 2024 prospectus supplement. The update states that net proceeds from Common Shares issuances will be invested per the Fund's objectives, with substantially all proceeds expected to be deployed within approximately three months, and pending investment held in U.S. Government securities or high quality short-term money market instruments. Notably, the amendment explicitly allows proceeds to be used to pay distributions to shareholders, a detail relevant to income-focused NMZ holders.

Key figures

Expected Investment Period
approximately three months to invest substantially all net proceeds

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