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): September 24, 2002 Cabot Microelectronics Corporation ---------------------------------------------------- (Exact name of registrant as specified in its charter) Delaware 000-30205 36-4324765 ------------------------------- ------------------------ ----------------- (State or other jurisdiction of (Commission File Number) (IRS Employer incorporation) Identification) 870 Commons Drive, Aurora, Illinois 60504 -------------------------------------------------------------------- (Address of principal executive offices) (Zip Code) (630) 375-6631 ------------------------------------------------------------------------ (Registrant's telephone number, including area code) Not applicable ---------------------------------------------------------------------------- (Former name or former address, if changed since last report) Item 5. Other Events. On September 24, 2002, Cabot Microelectronics Corporation issued a press release entitled "J. Joseph King Elected to Cabot Microelectronics' Board of Directors," a copy of which is attached hereto as Exhibit 99.1 and incorporated herein by reference. Item 7. Financial Statements and Exhibits. (c) Exhibits The following exhibits are filed herewith: 99.1 Text of press release, dated September 24, 2002, entitled "J. Joseph King Elected to Cabot Microelectronics' Board of Directors." SIGNATURE 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 thereunto duly authorized. CABOT MICROELECTRONICS CORPORATION Date: September 24, 2002 By: /s/ MARTIN M. ELLEN ------------------- Martin M. Ellen Vice President, Chief Financial Officer [Principal Financial Officer] 2 INDEX TO EXHIBITS Exhibit Number Title ------ ----- 99.1 Text of press release, dated September 24, 2002, entitled "J. Joseph King Elected to Cabot Microelectronics' Board of Directors." 3