Company: NMZ
Filing Date: 2025-07-07
Form Type: N-CSRS
Source: 0001193125-25-156000
Chunk: 74

Company: NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND
Filing Date: 2025-07-07
Form: N-CSRS
Chunk 74
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 companies.

| Item 9. | Proxy Disclosures for Open-End Management Investment Companies. |

Not applicable to closed-endinvestment companies.

| Item 10. | Remuneration Paid to Directors, Officers, and Others of Open-End 
 Management Investment Companies.                                 |

Not applicable to closed-endinvestment companies.

| Item 11. | Statement Regarding Basis for Approval of Investment Advisory Contract. |

See Statement Regarding Basis for Approval of Investment Advisory Contract in Item 1.

| Item 12. | Disclosure of Proxy Voting Policies and Procedures for Closed-End 
 Management Investment Companies.                                  |

Not applicable to this filing.

| Item 13. | Portfolio Managers of Closed-End Management Investment Companies. |

Not applicable to this filing.

| Item 14. | Purchases of Equity Securities by Closed-End Management Investment 
 Company and Affiliated Purchasers.                                 |

Not applicable.

| Item 15. | Submission of Matters to a Vote of Security Holders. |

There have been no material changes to the procedures by which shareholders may recommend nominees to the registrant’s Board implemented after the registrant last provided disclosure in response to this Item.

| Item 16. | Controls and Procedures. |

| (a) | The registrant’s principal executive and principal financial officers, or persons performing similar                                                                                                                                                                                                                                                                                             
 functions, have concluded that the registrant’s disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940, as amended (the “1940 Act”) (17 CFR 270.30a-3(c))) are effective, as of a date within 90 days of the filing date of this report that includes the disclosure required by this paragraph, based on their evaluation of the controls and 
 procedures required by Rule 30a-3(b) under the 1940 Act (17 CFR 270.30a-3(b)) and Rules 13a-15(b) or 15d-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