Company: NMZ
Filing Date: 2025-11-18
Form Type: N-14 8C/A
Source: 0001999371-25-018025
Chunk: 239

Company: NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND
Filing Date: 2025-11-18
Form: N-14 8C/A
Chunk 239
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PE.</div>

| xxxxxxxxxxxxxx | code |

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 proposal. 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
Special Meeting or any adjournment or postponement thereof.

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

| Proposal | The Board of Trustees unanimously recommends that you vote “FOR” the proposal. |

|    |                                                                                                                                | FOR | AGAINST | ABSTAIN |
| 2. | To approve the issuance of additional common shares of the Acquiring Fund in connection with the Agreement and Plan of Merger. | ☐   | ☐       | ☐       |

<div align='center'>Important Notice Regarding the Availability of Proxy Materials for

Nuveen Municipal High Income Opportunity Fund,

Special Meeting of Shareholders to be held on January 16, 2026.

The Joint Proxy Statement/Prospectus and this proxy
card are available at

https://www.nuveen.com/en-us/investments/proxy-information#closed-end-funds</div>

|                                                                                                                                                                                                                                                                                                                                                 | Authorized Signatures — This section must be completed for your vote to be counted.— Sign and Date Below |
| Note: Please sign exactly as your name(s) appear(s) on this proxy card, and date it. When shares are held jointly, each holder should sign. When signing as attorney, executor, guardian, administrator, trustee, officer of corporation or other entity or in another representative capacity, please give the full title under the signature. |                                                                                                          |

| Date (mm/dd/yyyy) — Please print date below |     | Signature 1 — Please keep signature within the box |     | Signature 2 — Please keep signature within the box |
| /  /                                        |     |                                                    |     |                                                    |

| Scanner bar code |

| xxxxxxxxxxxxxx | NMZ 34776 | xxxxxxxx |

The information in this Statement of Additional Information is not complete and may be changed. We may not sell these securities until the registration statement filed with the Securities and Exchange Commission is effective. This Statement of Additional Information is not an offer to sell these securities and is not soliciting an offer to buy these securities in any