# EDGAR Filing Document

**Accession Number:** 0001266585
**File Stem:** 9999999995-25-003802
**Filing Date:** 2025-12
**Character Count:** 1194
**Document Hash:** 79c0e62fcf0b6eab059d1485638f5cf1
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**9999999995-25-003802.hdr.sgml**: 20251218

**ACCESSION NUMBER**: 9999999995-25-003802

**CONFORMED SUBMISSION TYPE**: EFFECT

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20251217

**DATE AS OF CHANGE**: 20251218

**EFFECTIVENESS DATE**: 20251217

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND
- **CENTRAL INDEX KEY:** 0001266585

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** MA

**FILING VALUES:**
- **FORM TYPE:** EFFECT
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-290590
- **FILM NUMBER:** 251581168

**BUSINESS ADDRESS:**
- **STREET 1:** 333 W WACKER DRIVE
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60606
- **BUSINESS PHONE:** 312 917 8146

**MAIL ADDRESS:**
- **STREET 1:** 333 WEST WACKER DRIVE
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60606

### UNITED STATES
### SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## Notice of Effectiveness

**Date:** December 17, 2025

**Time:** 15:00:00

**Form Type:** N-14 8C

---

**CIK:** 0001266585

**Company Name:** NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND

**File Number:** 333-290590