# NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND — 425

NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND of CHICAGO, IL filed a 425 with the SEC on 2026-01-23.

## Filing

- Filed: 2026-01-23
- Form: 425
- Accession: 0001999371-26-001521
- Registrant: NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND
- CIK: 0001266585
- State of incorporation: MA
- Location: CHICAGO, IL

## Documents (2)

| Seq | Type | Description |
| --- | --- | --- |
| 1 | 425 | FILING UNDER RULE 425 |
| 2 | GRAPHIC | GRAPHIC |

## Filing timeline for this registrant (57)

_Showing 12 of 57 filings._

| Filed | Form |
| --- | --- |
| [2026-07-02](https://search.stillhousedata.com/proxy/0001193125-26-293122) | DEF 14A |
| [2026-02-04](https://search.stillhousedata.com/proxy/0001999371-26-002520) | 425 |
| [2026-02-04](https://search.stillhousedata.com/proxy/0001999371-26-002519) | 425 |
| [2026-02-02](https://search.stillhousedata.com/proxy/0001999371-26-002257) | 425 |
| [2026-02-02](https://search.stillhousedata.com/proxy/0001999371-26-002256) | 425 |
| 2026-01-23 | 425 |
| [2026-01-23](https://search.stillhousedata.com/proxy/0001999371-26-001519) | 425 |
| [2026-01-16](https://search.stillhousedata.com/proxy/0001999371-26-001131) | 425 |
| [2026-01-16](https://search.stillhousedata.com/proxy/0001999371-26-001128) | 425 |
| [2025-12-29](https://search.stillhousedata.com/proxy/0001999371-25-021261) | 425 |
| [2025-12-29](https://search.stillhousedata.com/proxy/0001999371-25-021260) | 425 |
| [2025-12-29](https://search.stillhousedata.com/proxy/0001999371-25-021258) | 425 |

## Co-filers (1)

- NUVEEN PENNSYLVANIA QUALITY MUNICIPAL INCOME FUND

## More

- [CIK 1266585 on SEC EDGAR (source of record)](https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=1266585&type=&dateb=&owner=include&count=40)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/proxy/0001999371-26-001521.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

---

Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.