UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of Earliest Event Reported): January 20, 2004 ALLMERICA FINANCIAL CORPORATION ------------------------------- (Exact name of Registrant as specified in its charter) Delaware 1-13754 04-3263626 (State or other jurisdic- (Commission File Number) (I.R.S. Employer tion of incorporation) Identification No.) 440 Lincoln Street, Worcester, Massachusetts 01653 -------------------------------------------------- (Address of principal executive offices) (Zip Code) (508) 855-1000 -------------- (Registrant's telephone number, including area code) Item 7. Financial Statements and Exhibits. (a) Not applicable. (b) Not applicable. (c) Not applicable. Item 9. Regulation FD Disclosure Allmerica Financial Corporation ("AFC") previously announced a blackout period applicable to the employee retirement and pension plans of its wholly owned subsidiary, First Allmerica Financial Life Insurance Company, offering investment in AFC's Common Stock, due to the conversion to a new record-keeper and service provider. The blackout period was expected to end during the week of January 18, 2004. The actual end date of the blackout period was Tuesday morning, January 20, 2004. 2 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. Allmerica Financial Corporation ------------------------------- Registrant By: /s/ Edward J. Parry III ------------------------ Edward J. Parry, III Chief Financial Officer, Executive Vice President, Principal Accounting Officer, and Director Date: January 20, 2004 3