<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the OM
Group, Inc. Consolidated Balance Sheets at December 31, 1999 and 1998 and the OM
Group, Inc. Statements of Consolidated Income for the years ended December 31,
1999 and 1998 and is qualified in its entirety by reference to such financial
statements.
</LEGEND>
<MULTIPLIER> 1,000

<S>                             <C>                     <C>
<PERIOD-TYPE>                   12-MOS                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999             DEC-31-1998
<PERIOD-END>                               DEC-31-1999             DEC-31-1998
<CASH>                                           9,433                   7,750
<SECURITIES>                                         0                       0
<RECEIVABLES>                                  101,623                  82,296
<ALLOWANCES>                                     1,131                   1,390
<INVENTORY>                                    332,810                 283,264
<CURRENT-ASSETS>                               497,024                 420,241
<PP&E>                                         431,725                 338,768
<DEPRECIATION>                                 112,910                  93,423
<TOTAL-ASSETS>                               1,017,921                 870,719
<CURRENT-LIABILITIES>                          124,856                 119,567
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                           240                     240
<OTHER-SE>                                     448,988                 403,903
<TOTAL-LIABILITY-AND-EQUITY>                 1,017,921                 870,719
<SALES>                                        506,955                 521,226
<TOTAL-REVENUES>                               506,955                 521,226
<CGS>                                          347,450                 376,274
<TOTAL-COSTS>                                  408,218                 434,302
<OTHER-EXPENSES>                                 (637)                      40
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                              19,081                  15,560
<INCOME-PRETAX>                                 80,293                  71,324
<INCOME-TAX>                                    24,468                  22,966
<INCOME-CONTINUING>                             55,825                  48,358
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                    55,825                  48,358
<EPS-BASIC>                                       2.35                    2.11
<EPS-DILUTED>                                     2.30                    2.05


</TABLE>