<ARTICLE> 5
<LEGEND> This schedule contains summary financial information extracted from the
Arthur J. Gallagher & Co. Consolidated Financial Statements included in the Form
10-Q for the nine month period ended September 30, 1999 and is qualified in its
entirety by reference to such financial statements.
</LEGEND>
<RESTATED>
<MULTIPLIER> 1,000

                                                    
<PERIOD-TYPE>                   9-MOS                     9-MOS
<FISCAL-YEAR-END>                         DEC-31-1999               DEC-31-1998
<PERIOD-START>                            JAN-01-1999               JAN-01-1998
<PERIOD-END>                              SEP-30-1999               SEP-30-1998
<CASH>                                        187,100                   176,852
<SECURITIES>                                   61,715                    56,266
<RECEIVABLES>                                 296,609                   269,976
<ALLOWANCES>                                      922                     1,079
<INVENTORY>                                         0                         0
<CURRENT-ASSETS>                              586,163                   542,229
<PP&E>                                        111,376                    95,988
<DEPRECIATION>                                 74,671                    67,570
<TOTAL-ASSETS>                                821,261                   746,149
<CURRENT-LIABILITIES>                         573,717                   531,506
<BONDS>                                             0                         0
<PREFERRED-MANDATORY>                               0                         0
<PREFERRED>                                         0                         0
<COMMON>                                       18,371                    18,053
<OTHER-SE>                                    214,932                   182,299
<TOTAL-LIABILITY-AND-EQUITY>                  821,261                   746,149
<SALES>                                       417,189                   391,008
<TOTAL-REVENUES>                              436,358                   405,163
<CGS>                                         226,938                   214,306
<TOTAL-COSTS>                                 226,938                   214,306
<OTHER-EXPENSES>                              133,704                   128,338
<LOSS-PROVISION>                                (502)                     (577)
<INTEREST-EXPENSE>                                847                     1,014
<INCOME-PRETAX>                                75,371                    62,082
<INCOME-TAX>                                   26,380                    19,985
<INCOME-CONTINUING>                            48,991                    42,097
<DISCONTINUED>                                      0                         0
<EXTRAORDINARY>                                     0                         0
<CHANGES>                                           0                         0
<NET-INCOME>                                   48,991                    42,097
<EPS-BASIC>                                      2.69                      2.34
<EPS-DILUTED>                                    2.55                      2.24