# Pioneer Municipal High Income Opportunities Fund Inc. (MIO)

Source: https://www.quantisnow.com/company/MIO
Generated: 2026-11-15T17:22:15.799Z

- Ticker: MIO
- Exchange: NYSE
- Sector: Finance
- Industry: Investment Managers
- IPO year: 2021

## Latest MIO news and filings

- 2025-09-02 20:27 UTC [SEC Form 4] [Large owner Saba Capital Management, L.P. disposed of $24,271,983 worth of shares (2,161,352 units at $11.23) (SEC Form 4)](https://www.quantisnow.com/insight/large-owner-saba-capital-management-lp-disposed-of-24271983-worth-6185983)
- 2025-09-02 10:03 UTC [Amendment: SEC Form SCHEDULE 13D/A filed by Pioneer Municipal High Income Opportunities Fund Inc.](https://www.quantisnow.com/insight/amendment-sec-form-schedule-13da-filed-by-pioneer-municipal-high-6184532)
- 2025-08-27 18:06 UTC [SEC Form N-PX filed by Pioneer Municipal High Income Opportunities Fund Inc.](https://www.quantisnow.com/insight/sec-form-n-px-filed-by-pioneer-municipal-high-income-opportunities-6180593)
- 2025-08-27 15:24 UTC [SEC Form 25-NSE filed by Pioneer Municipal High Income Opportunities Fund Inc.](https://www.quantisnow.com/insight/sec-form-25-nse-filed-by-pioneer-municipal-high-income-opportunities-6180480)
- 2025-08-22 20:30 UTC [Pioneer Municipal High Income Advantage Fund, Inc. — Pioneer Municipal High Income Fund, Inc. — Pioneer Municipal High Income Opportunities Fund, Inc.](https://www.quantisnow.com/insight/pioneer-municipal-high-income-advantage-fund-inc-pioneer-municipal-high-6176276)
- 2025-08-14 20:24 UTC [Amendment: SEC Form SCHEDULE 13G/A filed by Pioneer Municipal High Income Opportunities Fund Inc.](https://www.quantisnow.com/insight/amendment-sec-form-schedule-13ga-filed-by-pioneer-municipal-high-6166502)
- 2025-07-17 20:35 UTC [Announce Results of Each Fund's Special Meeting of Stockholders:
Proposal to Liquidate and Dissolve the Fund is Approved](https://www.quantisnow.com/insight/announce-results-of-each-funds-special-meeting-of-stockholders-proposal-6124036)
- 2025-07-14 19:30 UTC [SEC Form N-CEN filed by Pioneer Municipal High Income Opportunities Fund Inc.](https://www.quantisnow.com/insight/sec-form-n-cen-filed-by-pioneer-municipal-high-income-opportunities-6119100)
- 2025-07-09 18:06 UTC [SEC Form N-CSR filed by Pioneer Municipal High Income Opportunities Fund Inc.](https://www.quantisnow.com/insight/sec-form-n-csr-filed-by-pioneer-municipal-high-income-opportunities-6115319)
- 2025-07-09 17:53 UTC [SEC Form DEFA14A] [SEC Form DEFA14A filed by Pioneer Municipal High Income Opportunities Fund Inc.](https://www.quantisnow.com/insight/sec-form-defa14a-filed-by-pioneer-municipal-high-income-opportunities-6115308)
- 2025-07-03 18:30 UTC [Dividends] [Pioneer Closed-End Funds Declare Monthly Distributions](https://www.quantisnow.com/insight/pioneer-closed-end-funds-declare-monthly-distributions-6110647)
- 2025-06-10 20:45 UTC [SEC Form DEF 14A] [SEC Form DEF 14A filed by Pioneer Municipal High Income Opportunities Fund Inc.](https://www.quantisnow.com/insight/sec-form-def-14a-filed-by-pioneer-municipal-high-income-6080763)
- 2025-06-04 20:30 UTC [Dividends] [Pioneer Closed-End Funds Declare Monthly Distributions](https://www.quantisnow.com/insight/pioneer-closed-end-funds-declare-monthly-distributions-6072534)
- 2025-05-20 21:07 UTC [SEC Form PRE 14A] [SEC Form PRE 14A filed by Pioneer Municipal High Income Opportunities Fund Inc.](https://www.quantisnow.com/insight/sec-form-pre-14a-filed-by-pioneer-municipal-high-income-6050821)
- 2025-05-20 13:24 UTC [SEC Form 8-K] [SEC Form 8-K filed by Pioneer Municipal High Income Opportunities Fund Inc.](https://www.quantisnow.com/insight/sec-form-8-k-filed-by-pioneer-municipal-high-income-opportunities-6049743)
- 2025-05-08 21:24 UTC [SEC Form 8-K] [Pioneer Municipal High Income Opportunities Fund Inc. filed SEC Form 8-K: Other Events, Financial Statements and Exhibits](https://www.quantisnow.com/insight/pioneer-municipal-high-income-opportunities-fund-inc-filed-sec-form-6028584)
- 2025-05-08 21:00 UTC [Pioneer Closed-End Funds Announce Board Approval of Plan of Liquidation](https://www.quantisnow.com/insight/pioneer-closed-end-funds-announce-board-approval-of-plan-of-liquidation-6028357)
- 2025-05-08 14:06 UTC [Insider Buy] [Large owner Saba Capital Management, L.P. bought $12,622 worth of shares (1,090 units at $11.58) (SEC Form 4)](https://www.quantisnow.com/insight/large-owner-saba-capital-management-lp-bought-12622-worth-of-6026494)
- 2025-05-05 20:30 UTC [Dividends] [Pioneer Investments Declares Monthly Distributions For Six Pioneer Closed-End Funds](https://www.quantisnow.com/insight/pioneer-investments-declares-monthly-distributions-for-six-pioneer-closed-end-funds-6018360)
- 2025-05-01 20:58 UTC [Insider Buy] [Large owner Saba Capital Management, L.P. bought $2,267 worth of shares (197 units at $11.51) (SEC Form 4)](https://www.quantisnow.com/insight/large-owner-saba-capital-management-lp-bought-2267-worth-of-6014031)
- 2025-04-24 15:56 UTC [Insider Buy] [Large owner Saba Capital Management, L.P. bought $123,772 worth of shares (10,963 units at $11.29) (SEC Form 4)](https://www.quantisnow.com/insight/large-owner-saba-capital-management-lp-bought-123772-worth-of-6000219)
- 2025-04-22 13:52 UTC [Insider Buy] [Large owner Saba Capital Management, L.P. bought $59,684 worth of shares (5,310 units at $11.24) (SEC Form 4)](https://www.quantisnow.com/insight/large-owner-saba-capital-management-lp-bought-59684-worth-of-5995992)
- 2025-04-14 16:48 UTC [Insider Buy] [Large owner Saba Capital Management, L.P. bought $301,748 worth of shares (26,990 units at $11.18) (SEC Form 4)](https://www.quantisnow.com/insight/large-owner-saba-capital-management-lp-bought-301748-worth-of-5986633)
- 2025-04-10 14:46 UTC [Insider Buy] [Large owner Saba Capital Management, L.P. bought $28,052 worth of shares (2,465 units at $11.38) (SEC Form 4)](https://www.quantisnow.com/insight/large-owner-saba-capital-management-lp-bought-28052-worth-of-5983962)
- 2025-04-08 17:05 UTC [Insider Buy] [Large owner Saba Capital Management, L.P. bought $8,148 worth of shares (700 units at $11.64) (SEC Form 4)](https://www.quantisnow.com/insight/large-owner-saba-capital-management-lp-bought-8148-worth-of-5981076)
- 2025-04-04 20:30 UTC [Dividends] [Pioneer Investments Declares Monthly Distributions For Six Pioneer Closed-End Funds](https://www.quantisnow.com/insight/pioneer-investments-declares-monthly-distributions-for-six-pioneer-closed-end-funds-5978128)
- 2025-04-04 19:14 UTC [SEC Form 3] [SEC Form 3 filed by new insider Brown David Craig](https://www.quantisnow.com/insight/sec-form-3-filed-by-new-insider-brown-david-craig-5977723)
- 2025-03-31 13:00 UTC [Pioneer Closed-End Funds Required Notice to Shareholders Sources of Distribution Under Section 19(a)](https://www.quantisnow.com/insight/pioneer-closed-end-funds-required-notice-to-shareholders-sources-of-distribution-5966361)
- 2025-03-25 20:48 UTC [Pioneer Closed-End Funds Announce Postponement of March 26, 2025 Special Meeting of Stockholders](https://www.quantisnow.com/insight/pioneer-closed-end-funds-announce-postponement-of-march-26-2025-special-5959705)
- 2025-03-25 20:24 UTC [SEC Form 8-K] [SEC Form 8-K filed by Pioneer Municipal High Income Opportunities Fund Inc.](https://www.quantisnow.com/insight/sec-form-8-k-filed-by-pioneer-municipal-high-income-opportunities-5959523)
- 2025-03-04 21:05 UTC [Dividends] [Amundi US Declares Monthly Distributions for Six Pioneer Closed-End Funds](https://www.quantisnow.com/insight/amundi-us-declares-monthly-distributions-for-six-pioneer-closed-end-funds-5923307)
- 2025-02-28 14:00 UTC [Pioneer Closed-End Funds Required Notice to Shareholders Sources of Distribution Under Section 19(a)](https://www.quantisnow.com/insight/pioneer-closed-end-funds-required-notice-to-shareholders-sources-of-distribution-5916452)
- 2025-02-24 12:00 UTC [SEC Form DFAN14A] [SEC Form DFAN14A filed by Pioneer Municipal High Income Opportunities Fund Inc.](https://www.quantisnow.com/insight/sec-form-dfan14a-filed-by-pioneer-municipal-high-income-opportunities-5904284)
- 2025-02-14 17:52 UTC [SEC Form SCHEDULE 13G filed by Pioneer Municipal High Income Opportunities Fund Inc.](https://www.quantisnow.com/insight/sec-form-schedule-13g-filed-by-pioneer-municipal-high-income-5889822)
- 2025-02-11 00:16 UTC [SEC Form DEFC14A filed by Pioneer Municipal High Income Opportunities Fund Inc.](https://www.quantisnow.com/insight/sec-form-defc14a-filed-by-pioneer-municipal-high-income-opportunities-5880784)
- 2025-02-10 20:55 UTC [SEC Form DEFC14A filed by Pioneer Municipal High Income Opportunities Fund Inc.](https://www.quantisnow.com/insight/sec-form-defc14a-filed-by-pioneer-municipal-high-income-opportunities-5879583)
- 2025-02-05 21:05 UTC [Dividends] [Amundi US Declares Monthly Distributions for Six Pioneer Closed-End Funds](https://www.quantisnow.com/insight/amundi-us-declares-monthly-distributions-for-six-pioneer-closed-end-funds-5872836)
- 2025-02-04 15:35 UTC [Amendment: SEC Form SCHEDULE 13D/A filed by Pioneer Municipal High Income Opportunities Fund Inc.](https://www.quantisnow.com/insight/amendment-sec-form-schedule-13da-filed-by-pioneer-municipal-high-5869278)
- 2025-02-03 20:03 UTC [Insider Buy] [Large owner Saba Capital Management, L.P. bought $33,948 worth of shares (2,829 units at $12.00) (SEC Form 4)](https://www.quantisnow.com/insight/large-owner-saba-capital-management-lp-bought-33948-worth-of-5867124)
- 2025-01-31 22:24 UTC [SEC Form PRRN14A filed by Pioneer Municipal High Income Opportunities Fund Inc.](https://www.quantisnow.com/insight/sec-form-prrn14a-filed-by-pioneer-municipal-high-income-opportunities-5865789)

## More

- Live page with ratings, short volume, options and peers: https://www.quantisnow.com/company/MIO
- Earnings history: https://www.quantisnow.com/earnings/MIO
- Dividend history: https://www.quantisnow.com/dividends/MIO
- Insider transactions: https://www.quantisnow.com/insiders/MIO
- Options chain: https://www.quantisnow.com/options/MIO
- SEC 8-K filings only: https://www.quantisnow.com/company/MIO/8-k
- RSS and alerts for MIO: https://www.quantisnow.com/docs/rss-feeds.md