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Item 6. Exhibits.

8K characters. Original on sec.gov ·

Item 6. Exhibits.

See the Exhibit Index immediately following the signature page of this report, which is incorporated herein by reference.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

Date:April 16, 2026/s/ Mark C. McGivney
Mark C. McGivney
Chief Financial Officer
Date:April 16, 2026/s/ Stacy M. Mills
Stacy M. Mills
Vice President & Controller
(Chief Accounting Officer)

EXHIBIT INDEX

Exhibit No.Exhibit Name
4.1Twenty-first Supplemental Indenture, dated December 13, 2024, 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 10-K dated February 10, 2025)
10.1Letter Agreement Amendment, dated February 24, 2026, between Marsh & McLennan Companies, Inc. and John Q. Doyle
10.2Letter Agreement Amendment, dated February 24, 2026, between Marsh & McLennan Companies, Inc. and Mark C. McGivney
10.3Letter Agreement Amendment, dated March 6, 2026, between Marsh & McLennan Companies, Inc. and Martin South
10.4Letter Agreement Amendment, dated February 24, 2026, between Marsh & McLennan Companies, Inc. and Dean M. Klisura
10.5Letter Agreement Amendment, dated February 24, 2026, between Marsh & McLennan Companies, Inc. and Patrick Tomlinson
10.6Form of Stock Option Award, dated as of February 24, 2026, under the Amended and Restated Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan
10.7Form of Performance Stock Unit Award, dated as of February 24, 2026, under the Amended and Restated Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan
10.8Form of Restricted Stock Unit Award, dated as of February 24, 2026, under the Amended and Restated Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan
10.9Form of Deferred Stock Unit Award, with grant dates from March 1, 2026 through February 1, 2027, under the Amended and Restated Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan – Cliff Vesting
10.10Form of Deferred Stock Unit Award, with grant dates from March 1, 2026 through February 1, 2027, under the Amended and Restated Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan – Ratable Vesting
31.1Rule 13a-14(a)/15d-14(a) Certification of Chief Executive Officer
31.2Rule 13a-14(a)/15d-14(a) Certification of Chief Financial Officer
32.1Section 1350 Certifications
101.INSXBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
101.SCHXBRL Taxonomy Extension Schema
101.CALXBRL Taxonomy Extension Calculation Linkbase
101.DEFXBRL Taxonomy Extension Definition Linkbase
101.LABXBRL Taxonomy Extension Label Linkbase
101.PREXBRL Taxonomy Extension Presentation Linkbase
104Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)

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