| Exhibit No. | | | | | | Exhibit Name | | | | | |
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| 4.1 | | | | | | Sixteenth Supplemental Indenture, dated March 9, 2023, between Marsh & McLennan Companies, Inc. and the Bank of New York Mellon, as trustee (incorporated by reference to the Company’s Current Report on Form 8-K dated March 9, 2023) | | | | | |
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| 10.1 | | | | | | Letter Agreement, effective as of January 1, 2022, between Marsh & McLennan Companies, Inc. and Martin South | | | | | |
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| 10.2 | | | | | | Non-Competition and Non-Solicitation Agreement, dated as of December 1, 2021, between Marsh & McLennan Companies, Inc. and Martin South | | | | | |
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| 10.3 | | | | | | Form of Deferred Stock Unit Award, with grant dates from March 1, 2023 through February 1, 2024, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan – Cliff Vesting | | | | | |
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| 10.4 | | | | | | Form of Deferred Stock Unit Award, with grant dates from March 1, 2023 through February 1, 2024, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan – Ratable Vesting | | | | | |
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| 10.5 | | | | | | Form of Restricted Stock Unit Award, dated as of February 23, 2023, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan | | | | | |
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| 10.6 | | | | | | Form of Performance Stock Unit Award, dated as of February 23, 2023, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan | | | | | |
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| 10.7 | | | | | | Form of Stock Option Award, dated as of February 23, 2023, 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 | | | | | |