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): April 22, 2004 Cabot Microelectronics Corporation ------------------------------------------------------ (Exact name of registrant as specified in its charter) Delaware 000-30205 36-4324765 ---------------------------- ------------------------ ---------------- (State or other jurisdiction (Commission File Number) (IRS Employer of 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 7. Financial Statements and Exhibits. (c) Exhibits The following exhibits are filed herewith: 99.1 Press release, dated April 22, 2004, entitled "Cabot Microelectronics Reports Results For Second Fiscal Quarter 2004." Item 12. Results of Operations and Financial Condition. On April 22, 2004, Cabot Microelectronics Corporation issued a press release entitled "Cabot Microelectronics Reports Results For Second Fiscal Quarter 2004," a copy of which is attached hereto as Exhibit 99.1 and incorporated herein by reference. The press release contains financial and other information including that related to our second fiscal quarter ended March 31, 2004. The press release also includes cautionary statements identifying important factors that could cause actual results to differ materially from those described by any forward-looking statements. This information shall not be deemed "filed" for purposes of Section 18 of the Securities and Exchange Act of 1934, as amended (the "Exchange Act"), or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing. 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 hereunto duly authorized. CABOT MICROELECTRONICS CORPORATION Date: April 22, 2004 By: /s/ WILLIAM S. JOHNSON -------------------------------- William S. Johnson Vice President and Chief Financial Officer [Principal Financial Officer] 2 INDEX TO EXHIBITS Exhibit Number Title -------- ----- 99.1 Press release, dated April 22, 2004, entitled "Cabot Microelectronics Reports Results For Second Fiscal Quarter 2004." 3