<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 six month period ended June 30, 1999 and is qualified in its
entirety by reference to such financial statements.
</LEGEND>
<RESTATED>
<MULTIPLIER> 1,000

                                                    
<PERIOD-TYPE>                   6-MOS                     6-MOS
<FISCAL-YEAR-END>                         DEC-31-1999               DEC-31-1998
<PERIOD-START>                            JAN-01-1999               JAN-01-1998
<PERIOD-END>                              JUN-30-1999               JUN-30-1998
<CASH>                                        150,341                   163,281
<SECURITIES>                                   60,341                    62,457
<RECEIVABLES>                                 326,582                   267,544
<ALLOWANCES>                                      943                       846
<INVENTORY>                                         0                         0
<CURRENT-ASSETS>                              578,500                   538,088
<PP&E>                                        105,985                    95,121
<DEPRECIATION>                                 71,524                    66,944
<TOTAL-ASSETS>                                808,205                   728,858
<CURRENT-LIABILITIES>                         578,049                   521,826
<BONDS>                                             0                         0
<PREFERRED-MANDATORY>                               0                         0
<PREFERRED>                                         0                         0
<COMMON>                                       18,194                    18,069
<OTHER-SE>                                    197,467                   174,803
<TOTAL-LIABILITY-AND-EQUITY>                  808,205                   728,858
<SALES>                                       260,997                   243,098
<TOTAL-REVENUES>                              275,448                   255,979
<CGS>                                         148,724                   139,395
<TOTAL-COSTS>                                 148,724                   139,395
<OTHER-EXPENSES>                               86,669                    83,825
<LOSS-PROVISION>                                (179)                     (582)
<INTEREST-EXPENSE>                                553                       798
<INCOME-PRETAX>                                39,681                    32,543
<INCOME-TAX>                                   13,888                    10,659
<INCOME-CONTINUING>                            25,793                    21,884
<DISCONTINUED>                                      0                         0
<EXTRAORDINARY>                                     0                         0
<CHANGES>                                           0                         0
<NET-INCOME>                                   25,793                    21,884
<EPS-BASIC>                                      1.43                      1.23
<EPS-DILUTED>                                    1.36                      1.17