MFS Announces Special Distribution for Certain Closed-End Funds in Connection with Reorganizations

BOSTON--(BUSINESS WIRE)--MFS Investment Management^® (“MFS”) announced today a Special Distribution of the following closed-end funds (each a “Fund” and collectively, the “Funds”), all with declaration dates of May 11, 2026, ex-dividend dates of May 21, 2026, record dates of May 21, 2026, and payable dates of May 29, 2026:

Fund (ticker)	Income/ Share	Other Sources/ Share*	Total Amount/ Share
MFS® High Income Municipal Trust (NYSE: CXE)	$0.032520	$0.0000	$0.032520
MFS® High Yield Municipal Trust (NYSE: CMU)	$0.08630	$0.0000	$0.08630
MFS® Investment Grade Municipal Trust (NYSE: CXH)	$0.17075	$0.0000	$0.17075

*Distribution from "Other Sources" may contain sources of income other than ordinary income, such as short-term capital gains, long term capital gains, or return of capital, which cannot be determined until the close of the Fund's fiscal year end. Distributions that are treated for federal income tax purposes as a return of capital will reduce a shareholder's tax basis in his or her shares and, to the extent the distribution exceeds a shareholder's adjusted tax basis, will be treated as a gain to the shareholder from a sale of shares. Please see each Fund's most recent dividend source information available from payable date at MFS.com for the breakdown of the distribution.

The above distributions represent each Fund’s final distribution prior to its reorganization into and with the MFS Municipal Income Trust (“MFM”) (each a Reorganization and collectively, the “Reorganizations”). Each Reorganization was approved by shareholders at a Special Meeting of Shareholders. The Reorganizations are expected to be completed after the close of trading on Friday, June 5, 2026, which will be each Fund’s final day of trading, subject to satisfaction of customary closing conditions.

Shareholders of each Fund as of the close of market on June 5, 2026, will receive newly issued common shares of MFM with an aggregate net asset value equal to the net asset value of their Fund shares. Such shareholders will be deemed shareholders of MFM as of the opening of market trading on Monday, June 8, 2026.

Importantly, Fund shareholders who continue as shareholders of MFM following the Reorganization will be eligible to receive MFM's monthly distribution for June 2026, subject to applicable record date and distribution details, which are expected to be announced in early June.

Investors who want to make changes to their accounts should contact their financial advisor, brokerage firm, or other nominee with whom the shares are registered. If shares are registered with the Funds’ transfer agent, Computershare, the transfer agent may be contacted directly at 800-637-2304, or www.computershare.com.

About MFS Investment Management
In 1924, MFS launched the first US open-end mutual fund, opening the door to the markets for millions of everyday investors. Today, as a full-service global investment manager serving financial advisors, intermediaries and institutional clients, MFS still serves a single purpose: to create long-term value for clients by allocating capital responsibly. That takes our powerful investment approach combining collective expertise, thoughtful risk management and long-term discipline. Supported by our culture of shared values and collaboration, our teams of diverse thinkers actively debate ideas and assess material risks to uncover what we believe are the best investment opportunities in the market. As of April 30, 2026, MFS manages US $650.7 billion in assets on behalf of individual and institutional investors worldwide. Please visit mfs.com for more information.

The Funds are closed-end investment products. Common shares of the Funds are only available for purchase/sale on the NYSE at the current market price. Shares may trade at a discount to NAV.

MFS Investment Management
111 Huntington Ave, Boston, MA 02199

15812.175