| *10.42.3 | | Form of Long-Term Incentive Plan Stock Appreciation Rights Award Agreement (incorporated by reference to the same exhibit number to our Form 10-K Annual Report for 2010, File No. 1-09761). |
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| *10.42.4 | | Form of Long-Term Incentive Plan Restricted Stock Unit Award Agreement for executive officers over the age of 55 (incorporated by reference to the same exhibit number to our Form 10 Q Quarterly Report for the quarterly period ended March 31, 2013, File No. 1-09761). |
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| *10.42.5 | | Form of Long-Term Incentive Plan Stock Option Award Agreement for executive officers over the age of 55 (incorporated by reference to the same exhibit number to our Form 10 Q Quarterly Report for the quarterly period ended March 31, 2013, File No. 1-09761), |
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| *10.43 | | Arthur J. Gallagher & Co. Performance Unit Program (incorporated by reference to the same exhibit number to our Form 10-Q Quarterly Report for the quarterly period ended June 30, 2007, File No. 1-09761). |
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| *10.43.1 | | Form of Performance Unit Grant Agreement under the Performance Unit Program (incorporated by reference to Exhibit 10.45.1 to our Form 10-Q Quarterly Report for the quarterly period ended March 31, 2014, File No. 1-09761). |
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| *10.43.2 | | Form of Performance Unit Grant Agreement under the Performance Unit Program for executive officers over the age of 55 (incorporated by reference to the same exhibit number to our Form 10 Q Quarterly Report for the quarterly period ended March 31, 2013, File No. 1-09761). |
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| *10.44 | | Senior Management Incentive Plan (incorporated by reference to Exhibit 10.44 to our Form 10-Q Quarterly Report for the quarterly period ended June 30, 2015, File No. 1-09761). |
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| *10.45 | | Arthur J. Gallagher & Co. 2011 Long-Term Incentive Plan (incorporated by reference to Exhibit 99.1 to our Form S-8 Registration Statement, File No. 333-174497). |
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| *10.47 | | Arthur J. Gallagher & Co. 2014 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.46 to our Form 10-Q Quarterly Report for the quarterly period ended June 30, 2014, File No. 1-09761). |
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| *10.48 | | Arthur J. Gallagher & Co. 2017 Long-Term Incentive Plan (incorporated by reference to Exhibit 4.8 to our Form S-8 Registration Statement, File No. 333-221274). |
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| *10.50 | | Arthur J. Gallagher & Co. U.K. Employee Share Incentive Plan (incorporated by reference to Exhibit 4.3 to our Form S-8 Registration Statement, File No. 333-258331). |
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| *10.51 | | Form of Partnership Share Agreement under the Arthur J. Gallagher & Co. U.K. Employee Share Incentive Plan (incorporated by reference to Exhibit 4.4 to our Form S-8 Registration Statement, File No. 333-258331). |
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| 21.1 | | Subsidiaries of Arthur J. Gallagher & Co., including state or other jurisdiction of incorporation or organization and the names under which each does business. |
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| 23.1 | | Consent of Ernst & Young LLP, Independent Registered Public Accounting Firm. |
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| 24.1 | | Power of Attorney. |
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| 31.1 | | Rule 13a-14(a) Certification of Chief Executive Officer. |
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| 31.2 | | Rule 13a-14(a) Certification of Chief Financial Officer. |
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| 32.1 | | Section 1350 Certification of Chief Executive Officer. |
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| 32.2 | | Section 1350 Certification of Chief Financial Officer. |
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| 101.INS | | Inline XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document. |
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| 101.SCH | | Inline XBRL Taxonomy Extension Schema Document. |
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| 101.CAL | | Inline XBRL Taxonomy Extension Calculation Linkbase Document. |
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| 101.LAB | | Inline XBRL Taxonomy Extension Label Linkbase Document. |
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| 101.PRE | | Inline XBRL Taxonomy Extension Presentation Linkbase Document. |
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| 101.DEF | | Inline XBRL Taxonomy Extension Definition Linkbase Document. |
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| 104 | | Cover Page Interactive Data File formatted in Inline XBRL (included as Exhibit 101). |