Company: NMZ
Filing Date: 2025-01-06
Form Type: N-CSR
Source: 0001193125-25-002222
Chunk: 33

Company: NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND
Filing Date: 2025-01-06
Form: N-CSR
Chunk 33
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 transactions with qualified institutional buyers. As of the end of the reporting period, the aggregate value of these securities is $379,038,335 or 9.1% of Total Investments. |

| (c) | Backed by an escrow or trust containing sufficient U.S. Government or U.S. Government agency securities, which ensure the timely payment of principal and interest. |

| (d) | Defaulted security. A security whose issuer has failed to fully pay principal and/or interest when due, or is under the protection of bankruptcy. |

| (e) | For fair value measurement disclosure purposes, investment classified as Level 3. |

| (f) | Variable rate security. The rate shown is the coupon as of the end of the reporting period. |

| (g) | Step-upcoupon bond, a bond with a coupon that increases (“steps up”), usually at regular intervals, while the bond is outstanding. The rate shown is the coupon as of the end of the reporting period. |

| (h) | Inverse floating rate trust is a non recourse trust. |

| (i) | When-issued or delayed delivery security. |

| (j) | Senior loans generally pay interest at rates which are periodically adjusted by reference to a base short-term, floating lending rate (Reference Rate) plus an assigned fixed rate (Spread). These floating lending rates are generally (i) the lending rate referenced by the Secured Overnight Financing Rate (“SOFR”), or (ii) the prime rate offered by one or more major United States banks. Senior loans may be considered restricted in that the Fund ordinarily is contractually obligated to receive approval from the agent bank and/or borrower prior to the disposition of a senior loan. The rate shown is the coupon as of the end of the reporting period. |

| (k) | Senior loans generally are subject to mandatory and/or optional prepayment. Because of these mandatory prepayment conditions and because there may be significant economic incentives for a borrower to prepay, prepayments of senior loans may occur. As a result, the actual remaining maturity of senior loans held may be substantially less than the stated maturities shown. |

| (l) | MFP Shares, Net as a percentage of Total Investments is 15.4%. |

| (m) | VRDP Shares, Net as a percentage of Total Investments is 16.2%. |

| AMT | Alternative Minimum Tax |

| ETM | Escrowed to maturity |

| IF | Inverse floating rate security issued by