[EFFECT] NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND SEC Filing Filing Impact (Neutral) Filing Sentiment (Neutral) Form Type EFFECT AI-generated analysis. How Rhea-AI works. Not financial advice. See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google Add on Google Not now Accepted by SEC EDGAR 12/18/2025 - 12:15 AM Learn about SEC filing dates ⛶ Fullscreen UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Notice of Effectiveness Effectiveness Date: December 17, 2025 3:00 P.M. Form: N-14 8C CIK: 0001266585 Company Name: NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND File Number: 333-290590 Source: View Original Filing on SEC EDGAR