OM Group to Issue 2008 Second Quarter Results on August 7, 2008

Conference Call & Webcast Scheduled

CLEVELAND, July 22 /PRNewswire-FirstCall/ -- OM Group, Inc. (NYSE: OMG)
today announced that it plans to release its 2008 second quarter results
before the market opens on August 7, 2008. The company plans to discuss these
results on a conference call and live audio broadcast on the Web at 10:00 a.m.
(ET) on August 7, 2008. Investors may access the live audio broadcast by
logging on to
http://phx.corporate-ir.net/phoenix.zhtml?c=82564&p=irol-audioarchives .
A copy of the management's presentation materials will be available on the
company's Web site at the time of the call. The company recommends visiting
its Web site at least 15 minutes prior to the webcast to download and install
any necessary software. Also, a webcast audio replay will be available on the
"Investor Audio Archive" page of the company's Web site, approximately three
hours after the call.
ABOUT OM GROUP, INC.
OM Group, Inc. is a diversified global developer, producer and marketer of
value-added specialty chemicals and advanced materials that are essential to
complex chemical and industrial processes. Key technology-based end-use
applications include affordable energy, portable power, clean air, clean water
and proprietary products and services for the microelectronics industry.
Headquartered in Cleveland, Ohio, OM Group operates manufacturing facilities
in the Americas, Europe, Asia and Africa. For more information, visit the
company's Web site at http://www.omgi.com/ .
SOURCE OM Group, Inc.

Troy Dewar, Director, Investor Relations of OM Group, +1-216-263-7765