Company: NMZ
Filing Date: 2025-11-18
Form Type: N-14 8C/A
Source: 0001999371-25-018025
Chunk: 234

Company: NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND
Filing Date: 2025-11-18
Form: N-14 8C/A
Chunk 234
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 Joint Proxy Statement/Prospectus is hereby acknowledged. The votes entitled to be cast by the undersigned will be cast as indicated or FOR the proposals if no choice is indicated.

| VOTE VIA THE INTERNET: www.proxy-direct.com |
| VOTE VIA THE TELEPHONE: 1-800-337-3503      |

<div align='center'>NQP_34776_103025

PLEASE SIGN, DATE ON THE REVERSE SIDE AND RETURN THE PROXY PROMPTLY USING THE ENCLOSED ENVELOPE.</div>

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The votes entitled to be cast by the undersigned
will be cast as specified. If no other specification is made, such votes will be cast “FOR” the proposals. The votes entitled
to be cast by the undersigned will be cast in the discretion of the proxy holders on any other matter that may properly come before the
Annual Meeting or any adjournment or postponement thereof.

| TO VOTE, MARK BLOCKS BELOW IN BLUE OR BLACK INK AS SHOWN IN THIS EXAMPLE: |

| Proposals | The Board of Trustees unanimously recommends that you vote “FOR” the proposals. |

|    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | FOR | AGAINST | ABSTAIN |
| 1. | To approve an Agreement and Plan of Merger that provides for: (i) the merger of Nuveen Pennsylvania Quality Municipal Income Fund (the “Target Fund”) with and into NMZ Merger Sub, LLC, a Massachusetts limited liability company and a wholly-owned subsidiary of Nuveen Municipal High Income Opportunity Fund (the “Acquiring Fund”), and (ii) the conversion of the issued and outstanding common and preferred shares of beneficial interest of the Target Fund into newly issued common and preferred shares of beneficial interest, par value $0.01 per share, of the Acquiring Fund. | ☐   | ☐       | ☐       |

| 3a. | Election of Board Members:                                                                                                                                                                                                        | FOR | WITHHOLD | FOR ALL |
|     | Class I:                                                                                                                                                                                                                          | ALL | ALL      | EXCEPT  |
|     | 01.   Michael A. Forrester             02.   Thomas J. Kenny             03.   Robert L. Young                                                                                                                                    | ☐   | ☐        | ☐       |
|     | INSTRUCTIONS: To withhold authority to vote for any individual nominee(s), mark the box “FOR ALL EXCEPT” and write the nominee’s