Company: NMZ
Filing Date: 2025-11-18
Form Type: N-14 8C/A
Source: 0001999371-25-018025
Chunk: 326

Company: NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND
Filing Date: 2025-11-18
Form: N-14 8C/A
Chunk 326
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290590) and incorporated by reference herein.

<div align='center'>C-5</div>

Item 17. Undertakings

(1) The undersigned Registrant agrees that prior to any public reoffering of the securities registered through the use of a prospectus which is a part of this registration statement by any person or party who is deemed to be an underwriter within the meaning of Rule 145(c) of the Securities Act, the reoffering prospectus will contain the information called for by the applicable registration form for reofferings by persons who may be deemed underwriters, in addition to the information called for by the other items of the applicable form.

(2) The undersigned Registrant agrees that every prospectus that is filed under paragraph (1) above will be filed as a part of an amendment to the registration statement and will not be used until the amendment is effective, and that, in determining any liability under the Securities Act, each post-effective amendment shall be deemed to be a new registration statement for the securities offered therein, and the offering of the securities at that time shall be deemed to be the initial bona fide offering of them.

(3) The undersigned Registrant agrees that an executed opinion of counsel supporting the tax matters discussed in the Joint Proxy Statement/Prospectus will be filed with the Securities and Exchange Commission following the closing of the Merger.

<div align='center'>C-6

SIGNATURES</div>

As required by the Securities Act of 1933, the Registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized in the City of Chicago and the State of Illinois, on the 17th day of November, 2025.

| NUVEEN MUNICIPAL             
 HIGH INCOME OPPORTUNITY FUND |                         |
| By:                          | /s/ Mark L. Winget      |
|                              | Mark                    
 L. Winget               |
|                              | Vice                    
 President and Secretary |

As required by the Securities Act of 1933, this Registrant’s registration statement has been signed by the following persons in the capacities and on the dates indicated:

| Signature             
 /s/                   
 David J. Lamb         |     | Capacity                      
 Chief                         
 Administrative Officer        |                | Date               
 November           
 17, 2025           |
|:----------------------|:----|:------------------------------|:---------------|:-------------------|
| David J. Lamb         |     | -principal