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 December 28, 1999 SPARTECH CORPORATION (Exact name of registrant as specified in its charter) DELAWARE (State or other jurisdiction of incorporation) 1-5911 43-0761773 (Commission File Number) (IRS Employer Identification No.) 120 South Central Avenue, Suite 1700, Clayton, Missouri 63105 (Address of principal executive offices) (Zip Code) (314) 721-4242 (Registrant's Telephone Number, Including Area Code) SPARTECH CORPORATION FORM 8-K Item 5. Other Events This report files the Registrant's December 27, 1999 press release announcing an agreement to acquire substantially all of the assets of High Performance Plastics, Inc. Item 7. Financial Statements and Exhibits Exhibits 99 Spartech press release dated December 27, 1999. 2 SIGNATURES Pursuant to the requirements of the Securities Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. SPARTECH CORPORATION Date December 28, 1999 By /s/ Randy C. Martin Randy C. Martin Vice President-Finance and Chief Financial Officer 3