Company: NMZ
Filing Date: 2025-11-18
Form Type: N-14 8C/A
Source: 0001999371-25-018025
Chunk: 303

Company: NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND
Filing Date: 2025-11-18
Form: N-14 8C/A
Chunk 303
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 ratings are assigned to issuers or obligations with an original maturity of eleven months or more and reflect both on the likelihood of a default or impairment on contractual financial obligations and the expected financial loss suffered in the event of default or impairment.

| Aaa | Obligations                                                                              
 rated Aaa are judged to be of the highest quality, subject to the lowest level of credit 
 risk.                                                                                    |

| Aa | Obligations                                                                        
 rated Aa are judged to be of high quality and are subject to very low credit risk. |

| A | Obligations                                                                     
 rated A are judged to be upper-medium grade and are subject to low credit risk. |

| Baa | Obligations                                                                             
 rated Baa are judged to be medium-grade and subject to moderate credit risk and as such 
 may possess certain speculative characteristics.                                        |

| Ba | Obligations                                                                       
 rated Ba are judged to be speculative and are subject to substantial credit risk. |

| B | Obligations                                                             
 rated B are considered speculative and are subject to high credit risk. |

| Caa | Obligations                                                                          
 rated Caa are judged to be speculative of poor standing and are subject to very high 
 credit risk.                                                                         |

| Ca | Obligations                                                                                  
 rated Ca are highly speculative and are likely in, or very near, default, with some prospect 
 of recovery of principal and interest.                                                       |

| C | Obligations                                                                                  
 rated C are the lowest rated and are typically in default, with little prospect for recovery 
 of principal or interest.                                                                    |

Note: Moody’s appends numerical modifiers 1,2, and 3 to each generic rating classification from Aa through Caa. The modifier 1 indicates that the obligation ranks in the higher end of its generic rating category; the modifier 2 indicates a mid-range ranking; and the modifier 3 indicates a ranking in the lower end of that generic rating category.

SHORT-TERM OBLIGATION RATINGS

Moody’s short-term ratings are assigned to obligations with an original maturity of thirteen months or less and reflect both on the likelihood of a default or impairment on contractual financial obligations and the expected financial loss suffered in the event of default or impairment.

| P-1 | Ratings                                                                
 of Prime-1 reflect a superior ability to repay short-term obligations. |

| P-2 | Ratings                                                              
 of Prime-2 reflect a strong ability to repay short-term obligations. |

| P-3 | Ratings                                                                   
 of Prime-3 reflect an acceptable ability