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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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| 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 | | | The cover page from the Company’s Annual Report on Form 10-K for the year ended December 31, 2019, formatted in Inline XBRL (included as Exhibit 101). |