| Exhibit No. | | | | | | Exhibit Name | | | | | |
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| 10.1 | | | | | | Letter Agreement Amendment, dated February 18, 2025, between Marsh & McLennan Companies, Inc. and John Q. Doyle. | | | | | |
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| 10.2 | | | | | | Letter Agreement Amendment, dated February 18, 2025, between Marsh & McLennan Companies, Inc. and Mark C. McGivney. | | | | | |
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| 10.3 | | | | | | Letter Agreement Amendment, dated February 18, 2025, between Marsh & McLennan Companies, Inc. and Martin South. | | | | | |
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| 10.4 | | | | | | Letter Agreement Amendment, dated February 18, 2025, between Marsh & McLennan Companies, Inc. and Dean M. Klisura. | | | | | |
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| 10.5 | | | | | | Letter Agreement Amendment, dated February 18, 2025, between Marsh & McLennan Companies, Inc. and Patrick Tomlinson. | | | | | |
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| 10.6 | | | | | | Letter Agreement, effective as of April 1, 2024, between Marsh & McLennan Companies, Inc. and Patrick Tomlinson. | | | | | |
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| 10.7 | | | | | | Non-Competition and Non-Solicitation Agreement, effective as of April 1, 2024, between Marsh & McLennan Companies, Inc. and Patrick Tomlinson. | | | | | |
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| 10.8 | | | | | | Form of Stock Option Award, dated as of February 18, 2025, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan. | | | | | |
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| 10.9 | | | | | | Form of Performance Stock Unit Award, dated as of February 18, 2025, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan. | | | | | |
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| 10.10 | | | | | | Form of Restricted Stock Unit Award, dated as of February 18, 2025, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan. | | | | | |
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| 31.1 | | | | | | Rule 13a-14(a)/15d-14(a) Certification of Chief Executive Officer | | | | | |
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| 31.2 | | | | | | Rule 13a-14(a)/15d-14(a) Certification of Chief Financial Officer | | | | | |
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| 32.1 | | | | | | Section 1350 Certifications | | | | | |
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| 101.INS | | | | | | 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 | | | | | | XBRL Taxonomy Extension Schema | | | | | |
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| 101.CAL | | | | | | XBRL Taxonomy Extension Calculation Linkbase | | | | | |
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| 101.DEF | | | | | | XBRL Taxonomy Extension Definition Linkbase | | | | | |
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| 101.LAB | | | | | | XBRL Taxonomy Extension Label Linkbase | | | | | |
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| 101.PRE | | | | | | XBRL Taxonomy Extension Presentation Linkbase | | | | | |
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| 104 | | | | | | Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101) | | | | | |