Company: NMZ
Filing Date: 2025-07-07
Form Type: N-CSRS
Source: 0001193125-25-156000
Chunk: 49

Company: NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND
Filing Date: 2025-07-07
Form: N-CSRS
Chunk 49
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 $– |     |           | $16,995,750 |     |          | $– |     |             | $– |     |                             | $(479,512 | ) |     |           | 675,000 |     |          | $16,516,238 |     |          | $46,020 |

| 9. | Commitments and Contingencies |

In the normal course of business, each Fund enters into a variety of agreements that may expose the Fund to some risk of loss. These could include recourse arrangements for certain TOB Trusts and certain agreements related to preferred shares, which are described elsewhere in these Notes to Financial Statements. The risk of future loss arising from such agreements, while not quantifiable, is expected to be remote. As of the end of the reporting period, the Funds did not have any unfunded commitments other then those disclosed in the Notes to Financial Statements, when applicable. From time to time, the Funds may be party to certain legal proceedings in the ordinary course of business, including proceedings relating to the enforcement of the Funds’ rights under contracts. As of the end of the reporting period, management has determined that any legal proceeding(s) the Funds are subject to, including those described within this report, are unlikely to have a material impact to any of the Funds’ financial statements.

| 10. | Borrowing Arrangements |

Committed Line of Credit:The Funds, along with certain funds managed by the Adviser and by an affiliate of the Adviser (“Participating Funds”), have established a 364-day,$2.700 billion standby credit facility with a group of lenders, under which the Participating Funds may borrow for temporary purposes (other than on-goingleveraging for investment purposes). Each Participating Fund is allocated a designated proportion of the facility’s capacity (and its associated costs, as described below) based upon a multi-factor assessment of the likelihood and frequency of its need to 203

Notes to Financial Statements (continued) draw on the facility, the size of the Fund and its anticipated draws, and the potential importance of such draws to the operations and well-being of the Fund, relative to those of the other Funds. A Fund may effect draws on the facility in excess of its designated capacity if and to the extent that other Participating Funds have undrawn capacity. The credit facility expires in June 2026 unless extended or renewed. The credit facility has the following terms: 0.15% per annum on unused commitment amounts and a drawn interest rate