Company: NMZ
Filing Date: 2025-11-18
Form Type: N-14 8C/A
Source: 0001999371-25-018025
Chunk: 236

Company: NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND
Filing Date: 2025-11-18
Form: N-14 8C/A
Chunk 236
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 Missouri Quality Municipal Income Fund (a “Target Fund”), revoking previous proxies,
hereby appoints John M. McCann, Kevin J. McCarthy and Mark L. Winget, or any one of them as true and lawful attorneys with power of substitution
of each, to vote all shares of Nuveen Missouri Quality Municipal Income Fund that the undersigned is entitled to vote at the Annual Meeting
of Shareholders to be held on January 16, 2026, at [●] p.m., Central time, at the offices of Nuveen, LLC, 333 West Wacker Drive,
Chicago, Illinois 60606, and at any adjournment or postponement thereof as indicated on the reverse side. In their discretion, the proxy
holders named above are authorized to vote upon such other matters as may properly come before the meeting or any adjournment or postponement
thereof.

Receipt of the Notice of the Annual Meeting of Shareholders and the accompanying 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'>NOM_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 Missouri Quality Municipal Income Fund (the “Target Fund”) with and into NMZ Merger Sub, LLC, a Massachusetts limited liability company and a wholly