OM Group Launches Redesigned Web Site

CLEVELAND, Sept. 10 /PRNewswire-FirstCall/ — OM Group, Inc. announced today the launch of its newly redesigned Web site, http://www.omgi.com/.

“We’ve done much more than improve the aesthetic appeal of our Web site – we’ve made it easier for all audiences to get the information they need about OM Group,” said Joseph M. Scaminace, chairman and chief executive officer. “The enhanced site provides customers, investors and the media easy access to the data they may require, while offering other visitors a clear understanding of our businesses and products.”

Features of the site include an expanded investor relations section with convenient access to financial data, webcasts and other corporate information, as well as a simplified navigation system.

“The new Web site more clearly reflects OM Group’s strategic transformation into a diversified specialty chemicals and advanced materials company,” Scaminace added. “Moreover, the complete overhaul of the site’s architecture will allow the Web site to keep pace with the continuing growth of our business.”

ABOUT OM GROUP, INC.

OM Group is a leading, vertically integrated international producer and marketer of value-added, metal-based specialty chemicals and related materials. Headquartered in Cleveland, Ohio, OM Group operates manufacturing facilities in the Americas, Europe, Asia and Africa.

OM Group, Inc.

CONTACT: Greg Griffith, vice president, strategic planning, developmentand investor relations, +1-216-263-7455

Web site: http://www.omgi.com/