<TABLE> <S> <C>

<ARTICLE> 5 
<LEGEND>
This schedule contains summary financial information extracted from the OM
Group, Inc. Condensed Consolidated Balance Sheets at September 30, 1997
(Unaudited) and the OM Group, Inc. Statements of Consolidated Income for the
three and nine months ended September 30, 1997 (Unaudited) and is qualified in
its entirety by reference to such financial statements.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
                                              
<S>                             <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997
<PERIOD-END>                               SEP-10-1997             SEP-10-1997
<CASH>                                           6,766                   6,766
<SECURITIES>                                         0                       0
<RECEIVABLES>                                   82,825                  82,825
<ALLOWANCES>                                         0                       0
<INVENTORY>                                    228,864                 228,864
<CURRENT-ASSETS>                               325,954                 325,954
<PP&E>                                         213,492                 213,492
<DEPRECIATION>                                  69,752                  69,752
<TOTAL-ASSETS>                                 595,632                 595,632
<CURRENT-LIABILITIES>                           84,496                  84,496
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                           222                     222
<OTHER-SE>                                     293,759                 293,759
<TOTAL-LIABILITY-AND-EQUITY>                   595,632                 595,632
<SALES>                                        126,317                 360,706
<TOTAL-REVENUES>                               126,317                 360,706
<CGS>                                           96,368                 274,696
<TOTAL-COSTS>                                  107,997                 308,821
<OTHER-EXPENSES>                                 (231)                   (643)
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                               3,132                  10,286
<INCOME-PRETAX>                                 15,419                  42,242
<INCOME-TAX>                                     5,204                  14,232
<INCOME-CONTINUING>                             10,215                  28,010
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                    10,215                  28,010
<EPS-PRIMARY>                                      .46                    1.36
<EPS-DILUTED>                                      .45                    1.32
        

</TABLE>