| Form type | Sec Links | Description | Filing date | Reporting date |
|---|---|---|---|---|
| 8-K | Report | NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND | Mar 6, 2024 | Mar 6, 2024 |
| 8-K | Report | NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND | Oct 13, 2023 | Oct 13, 2023 |
| SC 13D/A | Report | SC 13D/A | Apr 26, 2023 | |
| SC 13D/A | Report | SC 13D/A | Apr 26, 2023 | |
| SC 13D | Report | SC 13D | Apr 12, 2023 | |
| SC 13D/A | Report | SC 13D/A | Apr 5, 2023 | |
| SC 13D/A | Report | SC 13D/A | Jun 13, 2022 | |
| 8-K | Report | 8-K | Feb 25, 2022 | Feb 24, 2022 |
| SC 13D/A | Report | SC 13D/A | Jan 4, 2022 | |
| SC 13D | Report | SC 13D | Apr 28, 2021 | |
| SC 13D/A | Report | SC 13D/A | Apr 21, 2021 | |
| 8-K | Report | 8-K | Oct 6, 2020 | Oct 5, 2020 |
| SC 13D/A | Report | NONE | Feb 27, 2018 | |
| 8-K | Report | FORM 8-K | Aug 5, 2016 | Aug 5, 2016 |
| SC 13G/A | Report | AMENDED SCHEDULE 13G | Feb 9, 2016 | |
| SC 13D/A | Report | NONE | Jul 2, 2015 | |
| SC 13G/A | Report | AMENDED SCHEDULE 13G | Jan 9, 2015 | |
| SC 13G/A | Report | AMENDED SCHEDULE 13G | Feb 3, 2014 | |
| SC 13D/A | Report | NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND 13D/A | Jul 17, 2013 | |
| SC 13G/A | Report | AMENDED SCHEDULE 13G | Feb 4, 2013 | |
| SC 13D | Report | NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND 13D | Dec 28, 2012 | |
| SC 13G | Report | SCHEDULE 13G | Nov 9, 2012 | |
| SC 13G/A | Report | NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND SC 13G/A 6-30-2011 | Jul 11, 2011 | |
| SC 13G/A | Report | NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND-SCH13G-A#7 | Jun 27, 2011 | |
| SC 13G/A | Report | SCHEDULE 13G AMENDMENT NO. 6 | Feb 14, 2011 | |
| SC 13G | Report | Jan 7, 2011 | ||
| SC 13G/A | Report | NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND 13GA5 | Aug 6, 2010 | |
| SC 13D | Report | FILING | Aug 5, 2010 | |
| SC 13G/A | Report | NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND 13GA4 | Jun 10, 2010 | |
| SC 13G/A | Report | SCHEDULE 13G AMENDMENT | Mar 12, 2010 | |
| SC 13G/A | Report | Feb 3, 2010 | ||
| SC 13G/A | Report | SCHEDULE 13G AMENDMENT | Jan 20, 2010 |