UNITED STATES SEC File Number SECURITIES AND EXCHANGE COMMISSION 001-12515 Washington, D.C. 20549 Cusip Number FORM 12b-25 NOTIFICATION OF LATE FILING (Check One) [ ] Form 10-K __ Form 20-F __ Form 11-K [X] Form 10-Q __ Form N-SAR For Period Ended: June 30, 2005 [ ] Transition Report on Form 10-K [ ] Transition Report on Form 20-F [ ] Transition Report on Form 11-K [ ] Transition Report on Form 10-Q [ ] Transition Report on Form N-SAR For the Transition Period Ended:____________________________ READ ATTACHED INSTRUCTION SHEET BEFORE PREPARING FORM. PLEASE PRINT OR TYPE Nothing in the form shall be construed to imply that the Commission has verified any information contained herein. -------------------------------------------------------------------------------- If the notification relates to a portion of the filing checked above, identify the Item(s) to which the notification relates: -------------------------------------------------------------------------------- PART I - REGISTRANT INFORMATION OM Group, Inc. -------------------------------------------------------------------------------- Full Name of Registrant -------------------------------------------------------------------------------- Former Name if Applicable 127 Public Square, 1500 Key Tower -------------------------------------------------------------------------------- Address of Principal Executive Office (STREET AND NUMBER) Cleveland, OH 44114-1221 -------------------------------------------------------------------------------- City, State and Zip Code PART II - RULES 12b-25(b) and (c) If the subject report could not be filed without unreasonable effort or expense and the registrant seeks relief pursuant to Rule 12b-25(b), the following should be completed. (Check appropriate box) X (a) The reasons described in reasonable detail in Part III of this form could not be eliminated without unreasonable effort or expense; __ (b) The subject annual report, semi-annual report, transition report on Form 10-K, Form 20-F, 11-K, Form N-SAR, or portion thereof, will be filed on or before the fifteenth calendar day following the prescribed due date; or the subject quarterly report of transition report on Form 10-Q, or portion thereof will be filed on or before the fifth calendar day following the prescribed due date; and __ (c) The accountant's statement or other exhibit required by Rule 12b-25(c) has been attached if applicable. PART III - NARRATIVE State below in reasonable detail the reasons why the Form 10-K, 11-K, 20-F, 10-Q, N-SAR, or the transition report or portion thereof, could not be filed within the prescribed time period. The Company completed and filed its 2003 Form 10-K, which contained restated financial statements for 2002 and 2001 and restated financial information for 2000 and 1999, on March 31, 2005. The Company filed its Form 10-Q's for 2004 on June 10, 2005. The Company is currently working to complete and file its Form 10-K for 2004. As a result, the Company is unable to file its Form 10-Q for the period ended June 30, 2005 by the prescribed due date. The Company intends to complete its 2004 Form 10-K and first and second quarter 2005 Form 10-Q's as promptly as is practicable, but does not expect the filing of the second quarter 2005 Form 10-Q to be made by August 15, 2005. PART IV - OTHER INFORMATION (1) Name and telephone number of person to contact in regard to this notification R. Louis Schneeberger 216 781-0083 -------------------------- ----------- ------------------ (Name) (Area Code) (Telephone Number) (2) Have all other periodic reports required under Section 13 or 15(d) of the Securities Exchange Act of 1934 or Section 30 of the Investment Company Act of 1940 during the preceding 12 months or for such shorter period that the registrant was required to file such reports been filed? If answer is no identify report(s). __ Yes X No Form 10-K - Year ended December 31, 2004 Form 10-Q - Quarter ended March 31, 2005 (3) Is it anticipated that any significant change in results of operations from the corresponding period for the last fiscal year will be reflected by the earnings statements to be included in the subject report or portion thereof? X Yes __ No If so, attach an explanation of the anticipated change, both narratively and quantitatively, and, if appropriate, state the reasons why a reasonable estimate of the results cannot be made: The results for the quarter ended June 30, 2005 are expected to be significantly different from those to be reported for 2004 due primarily to the benefit in 2004 of selling cobalt finished goods inventory that was manufactured using raw materials that were purchased before the rapid increase in the cobalt price near the end of 2003. In 2005, the opposite occurred - as cobalt prices declined - negatively impacting 2005 profitability. Since the Company has not yet finalized its second quarter 2005 results and publicly released its earnings, it is not possible at this time to discuss further any changes in the results of operations between the second quarters of 2005 and 2004. -------------------------------------------------------------------------------- OM Group, Inc. ------------------------------------------------------ (Name of Registrant as Specified in Charter) has caused this notification to be signed on its behalf by the undersigned hereunto duly authorized. Date August 9, 2005 By /s/ R. Louis Schneeberger ----------------------------------------