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.
Our SEC filing database is enhanced with expert analysis from Rhea-AI, providing insights into the potential impact of each filing on MFS HIGH YIELD MUNICIPAL TRUST's stock performance. Each filing includes a concise AI-generated summary, sentiment and impact scores, and end-of-day stock performance data showing the actual market reaction. Navigate easily through different filing types including 10-K annual reports, 10-Q quarterly reports, 8-K current reports, proxy statements (DEF 14A), and Form 4 insider trading disclosures.
Designed for fundamental investors and regulatory compliance professionals, our page simplifies access to critical SEC filings. By combining real-time EDGAR feed updates, Rhea-AI's analytical insights, and historical stock performance data, we provide comprehensive visibility into MFS HIGH YIELD MUNICIPAL TRUST's regulatory disclosures and financial reporting.
MFS High Yield Municipal Trust insiders filed an amended Form 4 after correcting how a recent trade was reported. On 01/20/2026, Phillip Goldstein purchased 678 shares of common stock at $3.50 per share. Following this transaction, he beneficially owned 24,878 shares directly.
The filing is made by Bulldog Investors, LLP, Phillip Goldstein, and Andrew Dakos. A footnote explains that the shares are held by Phillip Goldstein and that Bulldog Investors, LLP and Andrew Dakos disclaim beneficial interest in these shares except to the extent of any pecuniary interest. The amendment is specifically to show in Table I that the securities were acquired, not disposed of, in the reported transaction.
MFS High Yield Municipal Trust generated a total return of 0.54% at net asset value and 2.11% at market price for the 12 months ended November 30, 2025, compared with 2.64% for the Bloomberg Municipal Bond Index. The fund benefited from falling interest rates, with longer duration and yield-curve positioning helping results, but it lagged the benchmark due to weaker security selection in transportation and power, exposure to non-rated bonds, and an overweight in health care.
The portfolio is concentrated in municipal sectors such as hospitals, long-term care, airports, education, and housing, and holds a mix of investment grade and below investment grade bonds. The fund uses leverage through preferred shares and tender option bonds; as of November 30, 2025, it needed a 1.47% net portfolio return to cover leverage costs. Michael Dawson and Jason Kosty serve as portfolio managers, with Geoffrey Schechter stepping off the team effective September 30, 2025.
Phillip Goldstein, a reporting person for MFS High Yield Municipal Trust (CMU), purchased additional common shares of the fund. On January 20, 2026, he bought 678 shares of common stock at $3.50 per share, increasing his directly held position to 24,878 shares after the transaction.
The shares are held by Phillip Goldstein. Bulldog Investors, LLP and Andrew Dakos disclaim beneficial interest in these shares except to the extent of any pecuniary interest, and Andrew Dakos and Phillip Goldstein are partners of Bulldog Investors, LLP.
MFS High Yield Municipal Trust insider filing shows no current stake. An initial Form 3 for MFS High Yield Municipal Trust (ticker CMU) reports that Thomas P. Murphy, identified as a director of the fund’s advisor, does not beneficially own any of the trust’s securities. The filing explicitly states that no securities are beneficially owned, and there are no non-derivative or derivative holdings listed.
Bulldog Investors, LLP and principals Phillip Goldstein and Andrew Dakos report updated ownership stakes in MFS High Yield Municipal Trust (CMU). Based on 25,492,782 common shares outstanding as of May 31, 2025, Bulldog Investors is deemed to beneficially own 3,671,536 shares, or 14.40% of CMU. Phillip Goldstein reports beneficial ownership of 4,007,921 shares, or 15.72%, and Andrew Dakos reports 3,561,726 shares, or 13.97%.
The filing details that Bulldog Investors has sole voting and dispositive power over 109,810 CMU shares and shared power over 3,561,726 shares with its clients, none of whom individually hold more than 5%. Since November 14, 2025, the group bought additional CMU shares, including 215,000 shares on December 12, 2025 at $3.4782 per share and other trades such as 20,000 shares at $3.5083 per share on November 25, 2025. The parties report no special contracts or arrangements regarding CMU beyond these holdings.
MFS High Yield Municipal Trust (CMU) received a Form 4 filing from Joseph Flaherty, identified as an officer of the trust’s advisor. The filing relates to insider reporting for transactions with an earliest date of June 1, 2025. The document includes standard tables for non-derivative and derivative securities and confirms the report is filed by a single reporting person, but the excerpt does not display any specific transactions or position amounts.
Almitas Capital LLC filed a Schedule 13G reporting a significant position in MFS High Yield Municipal Trust (CMU). The firm beneficially owns 1,507,168 shares of CMU common stock, representing 5.9% of the outstanding class as of the event date 09/30/2025. Almitas, organized in Delaware and acting as an investment adviser, reports sole voting power and sole dispositive power over all of these shares, with no shared voting or dispositive authority. The filing indicates that no other persons or subsidiaries are identified as sharing this ownership or control.
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.