SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 ----------- FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(B) OR 12(G) OF THE SECURITIES EXCHANGE ACT OF 1934 PIONEER MUNICIPAL HIGH INCOME TRUST (Exact Name of Registrant as Specified in Its Charter) DELAWARE 030512430 -------------------------------------------- ---------- (State of Incorporation or Organization) (I.R.S. Employer Identification Number) 60 STATE STREET, BOSTON, MA 02109 -------------------------------------------- ---------- (Address of Principal Executive Offices) (Zip Code) If this form relates to the If this form relates to the registration of a class of securities registration of a class of securities pursuant to Section 12(b) of the pursuant to Section 12(g) of the Exchange Act and is effective Exchange Act and is effective pursuant to General Instruction pursuant to General Instruction A. (c), please check the following A (d), please check the following box. [X] box. [ ] Securities Act registration statement file number to which this form relates: FILE NO. 333-103836 ------------------ Securities to be registered pursuant to Section 12(b) of the Act: Title of Each Class Name of Each Exchange on Which TO BE SO REGISTERED EACH CLASS IS TO BE REGISTERED ------------------- ------------------------------ Common Shares of Beneficial Interest, New York Stock Exchange, Inc. No Par Value Securities to be registered pursuant to Section 12(g) of the Act: None. Total Number of Pages 3 Page 1 of 3 BOSTON 1691329v2 INFORMATION REQUIRED IN REGISTRATION STATEMENT Item 1. Description of Registrant's Securities to be Registered. The description of the Registrant's common shares to be registered is incorporated by reference to the description under the heading "Description of Shares" in the Registrant's Preliminary Prospectus dated July 1, 2003, which forms part of Pre-Effective Amendment No. 2 to the Registrant's Registration Statement on Form N-2 (File No. 333-103836; 811-21321) as electronically filed pursuant to Rule 497 under the Securities Exchange Act of 1933, as amended, with the Securities and Exchange Commission on July 2, 2003 (Accession No. 0001016964-03-000160), which is incorporated herein by reference. Item 2. Exhibits. Pursuant to the instructions as to Exhibits, no exhibits are filed herewith or incorporated by reference. page 2 of 3 BOSTON 1691329v2 SIGNATURE Pursuant to the requirements of Section 12 of the Securities Exchange Act of 1934, the registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereto duly authorized. Date: July 2, 2003 Pioneer Municipal High Income Trust ----------------------------------------------- (Registrant) By: /s/ Dorothy E. Bourassa ----------------------------------------------- (Signature) Dorothy E. Bourassa ----------------------------------------------- (Name) Its: Assistant Secretary ----------------------------------------------- Page 3 of 3 BOSTON 1691329v2