Welcome to our dedicated page for MFS High Yield Municipal Trust SEC filings (Ticker: CMU), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
MFS High Yield Municipal Trust (NYSE: CMU) is a diversified, closed-end management investment company that seeks high current income exempt from federal income tax by investing primarily in tax-exempt bonds and tax-exempt notes. As a registered investment company with listed common shares and preferred shares, its regulatory disclosures are an important resource for understanding its portfolio, leverage, and governance.
Although specific SEC filings are not listed here, public announcements reference documents such as tender offer statements on Schedule TO, which include the offer to purchase, letter of transmittal, and related materials for cash tender offers covering up to 10% of the fund’s outstanding common shares. These filings describe the terms of each tender offer, including pricing at a stated percentage of net asset value per share, conditions for acceptance, and procedures for prorating shares when tenders exceed the offer size.
Other regulatory-related communications discuss the fund’s Remarketable Variable Rate MuniFund Term Preferred Shares, Series 2051 (Series 2051 RVMTP Shares). Optional partial redemptions of these preferred shares, completed at their liquidation preference plus unpaid dividends and other distributions, affect the fund’s leverage attributable to preferred shares. Details of such actions are typically supported by formal notices and associated regulatory documentation.
On Stock Titan’s SEC filings page for CMU, investors can access the fund’s available regulatory documents as they are posted to the U.S. Securities and Exchange Commission’s EDGAR system. Stock Titan enhances this information with AI-powered summaries that explain the key points of lengthy filings in plain language, highlight material terms in tender offers, and clarify how preferred share redemptions and other actions may influence the fund’s structure.
By reviewing these filings and AI-generated insights together, users can better understand MFS High Yield Municipal Trust’s investment focus on tax-exempt bonds and notes, its use of preferred shares and leverage, and the formal terms governing tender offers and other corporate actions.
Bulldog Investors, Phillip Goldstein, and Andrew Dakos updated their ownership in MFS High Yield Municipal Trust (CMU) via Schedule 13D/A (Amendment No. 8). The filing bases percentages on 25,492,782 shares outstanding as of 5/31/2025, per an N-CSRS.
As of 11/12/2025, Bulldog Investors is deemed the beneficial owner of 3,295,118 shares, representing 12.93%. Phillip Goldstein is deemed the beneficial owner of 3,631,503 shares (14.25%), and Andrew Dakos is deemed the beneficial owner of 3,185,308 shares (12.49%).
Bulldog has sole voting/dispositive power over 109,810 shares and shared power over 3,185,308 shares. Goldstein has sole power over 109,810 shares and shared power over 3,521,693 shares; Dakos has shared power over 3,185,308 shares. Recent activity includes multiple trades, such as 35,000 shares at $3.5172 on 11/12/2025.
RiverNorth Capital Management, LLC filed an amended Schedule 13G reporting ownership of 2,579,075 shares of MFS High Yield Municipal Trust common shares, representing 10.12% of the class as of 09/30/2025. RiverNorth states it has sole voting and dispositive power over the reported shares and that the holdings were acquired and are held in the ordinary course of business, not to influence control. The filing lists RiverNorth's address in West Palm Beach, its Delaware organization, and is signed by Marcus Collins as General Counsel and Chief Compliance Officer on 10/07/2025.
MFS Investment Management filed a Form 4 reporting a change in beneficial ownership for MFS High Yield Municipal Trust (CMU) related to reporting person Kanwal Amrit, identified as an officer of the advisor. The form lists a transaction date of 04/02/2025 but the tables for non-derivative and derivative securities contain no quantities, prices, or ownership totals. The filing is signed by Christopher R. Bohane on 10/06/2025.
Sit Investment Associates, Inc. and its subsidiary Sit Fixed Income Advisors II, LLC report shared beneficial ownership of 1,045,340 shares of MFS High Yield Municipal Trust common stock, representing 4.1% of the class based on 25,492,782 shares outstanding as of May 31, 2025. The filing discloses shared voting and shared dispositive power over these shares and states the securities are held in client accounts managed by the advisers. The reporting entities assert the holdings were acquired and are held in the ordinary course of business and, pursuant to Rule 13d-4, disclaim beneficial ownership of the securities. The Schedule 13G/A covers the event date 09/30/2025 and is signed by Paul E. Rasmussen on 10/02/2025.
The filing amends a Schedule 13D for MFS High Yield Municipal Trust (CMU) to report current beneficial ownership by Bulldog Investors, LLP and its partners. As of August 27, 2025, Bulldog Investors is deemed beneficial owner of 3,006,546 shares (11.79%) of CMU. Phillip Goldstein is deemed beneficial owner of 3,342,968 shares (13.11%) and Andrew Dakos of 2,896,773 shares (11.36%), based on 25,492,782 shares outstanding as of 11/30/24. The amendment lists purchased shares and prices between July 17, 2025 and August 27, 2025, including multiple purchases at prices around $3.22–$3.33 per share. Bulldog reports sole power over 109,810 shares and shared power over 2,896,773 shares.
MFS High Yield Municipal Trust (NYSE:CMU) submitted a Form 4 reporting changes in insider ownership.
The disclosure identifies William Adams — an officer of the fund’s adviser — as the reporting person. The earliest transaction date is listed as 09/30/2024, and the Form was signed on 06/27/2025 and filed on 06/28/2025. The excerpt provided does not include the usual numeric detail (share amounts, prices or transaction codes), preventing assessment of the dollar value or relative size of the trade.
Because no quantitative data is shown, investors should review the full Form 4 on the SEC website to determine whether the transaction is material. Based on the limited information, the filing appears to be a routine Section 16 compliance event.