Company: NMZ
Filing Date: 2025-01-06
Form Type: N-CSR
Source: 0001193125-25-002222
Chunk: 175

Company: NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND
Filing Date: 2025-01-06
Form: N-CSR
Chunk 175
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d-15(b) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”) (17 CFR 240.13a-15(b) or 240.15d-15(b)). |

| (b) | There were no changes in the registrant’s internal control over financial reporting (as defined in Rule 30a-3(d) under the 1940 Act (17 CFR 270.30a-3(d)) that occurred during the period covered by this report that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting. |

| Item 17. | Disclosure of Securities Lending Activities for Closed-End Management Investment Companies. |

Not applicable.

| Item 18. | Recovery of Erroneously Awarded Compensation. |

| (a) | Not applicable. |

| (b) | Not applicable. |

| Item 19. | Exhibits. |

| (a)(1) | Not applicable because the code of ethics is available, upon request and without charge, by calling 800-257-8787 and there were no amendments during the period covered by this report. |

| (a)(2) | Not applicable. |

| (a)(3) | Certifications pursuant to Rule 30a-2(a) under the Investment Company Act of 1940 and Section 302 of the Sarbanes-Oxley Act of 2002 are attached hereto. |

| (a)(4) | Not applicable. |

| (a)(5) | Change in the registrant’s independent public accountant. Filed herewith. |

| (b) | Certification pursuant to Rule 30a-2(b) under the Investment Company Act of 1940 and Section 906 of the Sarbanes-Oxley Act of 2002 is attached hereto. |

| (c) | Consent of Independent Registered Public Accounting Firm. |

### SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Nuveen Municipal High Income Opportunity Fund

| Date: January 6, 2025 |     | By: |     | /s/ David J. Lamb            |
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