UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM N-PX ANNUAL REPORT OF PROXY VOTING RECORD OF REGISTERED MANAGEMENT INVESTMENT COMPANIES Investment Company Act file number 811-4492 MFS HIGH YIELD MUNICIPAL TRUST (Exact name of registrant as specified in charter) 500 Boylston Street, Boston, Massachusetts 02116 (Address of principal executive offices) (Zip code) Susan S. Newton Massachusetts Financial Services Company 500 Boylston Street Boston, Massachusetts 02116 (Name and address of agents for service) Registrant's telephone number, including area code: (617) 954-5000 Date of fiscal year end: November 30 Date of reporting period: July 1, 2009 - June 30, 2010 ITEM 1. PROXY VOTING RECORD. ******************************* FORM N-Px REPORT ******************************* ICA File Number: 811-04492 Reporting Period: 07/01/2009 - 06/30/2010 MFS High Yield Municipal Trust ======================== MFS High Yield Municipal Trust ======================== There is no proxy voting activity for the fund, as the fund did not hold any votable positions during the reporting period. ========== END NPX REPORT SIGNATURES Pursuant to the requirements of the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. Registrant: MFS HIGH YIELD MUNICIPAL TRUST By (Signature and Title) MARIA F. DWYER* ------------------------------------------- Maria F. Dwyer, Principal Executive Officer Date: August 26, 2010 *By (Signature and Title) /s/ Susan S. Newton ----------------------------------------- Susan S. Newton, as attorney-in-fact * Executed by Susan S. Newton on behalf of Maria F. Dwyer pursuant to a Power of Attorney dated October 27, 2008. (1) (1) Incorporated by reference to MFS Series Trust XIII (File Nos. 2-74959 and 811-3327) Post-Effective Amendment No. 42 filed with the SEC via EDGAR on June 25, 2009.