Company: NMZ
Filing Date: 2025-07-07
Form Type: N-CSRS
Source: 0001193125-25-156000
Chunk: 46

Company: NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND
Filing Date: 2025-07-07
Form: N-CSRS
Chunk 46
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 Statement of Operations. Preferred Share Transactions: Transactions in preferred shares during the Funds’ current and prior fiscal period, where applicable, are noted in the following tables. Transactions in MFP Shares for the Funds, where applicable, were as follows: 200

|                     |     | Six Months Ended 
 April 30, 2025   |   |     |        |      |   |     |             |
|:--------------------|:----|:-----------------|:--|:----|:-------|:-----|:--|:----|------------:|
| NMCO                |     | Series           |   |     | Shares |      |   |     |      Amount |
| MFP Shares redeemed |     |                  | C |     |        | (110 | ) |     | -11,000,000 |
|                     |     | Year Ended       
 October 31, 2024 |   |     |        |      |   |     |             |
| NMCO                |     | Series           |   |     | Shares |      |   |     |      Amount |
| MFP Shares redeemed |     |                  | C |     |        | (350 | ) |     | -35,000,000 |

7. Income Tax Information Each Fund is a separate taxpayer for federal income tax purposes. Each Fund intends to distribute substantially all of its net investment income and net capital gains to shareholders and otherwise comply with the requirements of Subchapter M of the Internal Revenue Code applicable to regulated investment companies. Therefore, no federal income tax provision is required. Each Fund intends to satisfy conditions that will enable interest from municipal securities, which is exempt from regular federal income tax, and in the case of NVG, the AMT applicable to individuals to retain such tax-exemptstatus when distributed to shareholders of the Funds. Net realized capital gains and ordinary income distributions paid by the Funds are subject to federal taxation. Each Fund files income tax returns in U.S. federal and applicable state and local jurisdictions. A Fund’s federal income tax returns are generally subject to examination for a period of three fiscal years after being filed. State and local tax returns may be subject to examination for an additional period of time depending on the jurisdiction. Management has analyzed each Fund’s tax positions taken for all open tax years and has concluded that no provision for income tax is required in the Fund’s financial statements. As of the end of the reporting period, the aggregate cost and the net unrealized appreciation/(depreciation) of all investments for