<PAGE> 1
Acknowledgment of Independent Accountants
Stockholders and Board of Directors
OM Group, Inc.
We are aware of the incorporation by reference in the following Registration
Statements of OM Group, Inc. of our reports dated May 10, August 11 and November
13, 2000, relating to the unaudited condensed consolidated interim financial
statements of OM Group, Inc. that are included in its Form 10-Q for the
quarters ended March 31, June 30 and September 30, 2000.
<TABLE>
<CAPTION>
Registration
Number Description Filing Date
------ ----------- -----------
<S> <C> <C>
33-74674 OM Group, Inc. Long-Term Incentive Compensation Plan -- Form S-8
Registration Statement -- 1,015,625 Shares January 27, 1994
333-07529 OMG Americas, Inc. Employees' Profit Sharing Plan --
Form S-8 Registration Statement -- 250,000 Shares July 3, 1996
333-07531 OM Group, Inc. Non-Employees Directors' Equity Plan --
Form S-8 Registration Statement -- 250,000 Shares July 3, 1996
333-47230 OM Group, Inc. 1998 Long-Term Incentive Compensation Plan --
Form S-8 Registration Statement -- 2,000,000 Shares October 3, 2000
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/s/ Ernst & Young LLP
Cleveland, Ohio
November 13, 2000
