Om 8-K/A Departure of Directors or Principal Officers

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K/A

CURRENT REPORT
Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): November 10, 2005

OM GROUP, INC.

(Exact name of registrant as specified in its charter)

Delaware
(State or other jurisdiction of incorporation)

001-12515
(Commission File Number)

52-1736882
(I.R.S. Employer Identification Number)

127 Public Square
1500 Key Tower
Cleveland, Ohio 44114-1221
(Address of principal executive offices)
(Zip code)

(216) 781-0083
(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

OM Group, Inc. is amending its Current Report on Form 8-K filed November 14, 2005 (the “Original Form 8-K”) pursuant to Instruction 2 to Item 5.02 of Form 8-K, to provide information that was not determined or available at the time of the filing of the Original Form 8-K. The Original Form 8-K was filed to report the appointment, effective November 10, 2005, of Steven J. Demetriou to the Board of Directors.

Item 5.02. Departure of Directors or Principal Officers; Election of Directors; Appointment of Principal Officers.

(d) On January 19, 2006, Steven J. Demetriou, whose term of office as a director of OM Group, Inc. commenced on November 10, 2005, was appointed to the Audit Committee, Compensation Committee and the Nominating and Governance Committee of the 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.

	OM Group, Inc.
	(Registrant)
Date: January 23, 2006	/s/ Joseph M. Scaminace
	Name:	Joseph M. Scaminace
	Title:	Chairman and Chief Executive Officer