Document

John Q. Doyle

President and Chief Executive Officer

Marsh & McLennan Companies, Inc.

1166 Avenue of the Americas

New York, NY 10036

T +1 212 345 5000

www.corporate.marsh.com


February 24, 2026 Dean Klisura Electronic Delivery

Subject: Terms of Employment

Dear Dean,

This third amendment to the Letter Agreement, dated December 1, 2021, between you and Marsh & McLennan Companies, Inc. (“Marsh”) as subsequently amended on February 22, 2024 and February 18, 2025 (taken together, the “Letter Agreement”), revises the terms and conditions of your employment as President and Chief Executive Officer of Guy Carpenter and Vice Chair, Marsh. The Letter Agreement will continue to govern your employment except as specified below:

1Exhibit A to the Letter Agreement shall be deleted and replaced in its entirety with the attached Exhibit A.

The terms of this amendment are effective as of February 24, 2026. Please acknowledge your agreement with the terms of the Letter Agreement, as further amended by this third amendment, by signing and dating this amendment.

Sincerely,

/s/ John Q. Doyle

John Q. Doyle

President and Chief Executive Officer

Marsh

Page 2

February 24, 2026

Dean Klisura

Accepted and Agreed:

/s/ Dean M. Klisura

(Signature)

March 9, 2026

(Date)

Exhibit A

Page 3

February 24, 2026

Dean Klisura


Board or Committee Memberships			None
Annual Base Salary			$900,000 effective as of April 1, 2025.
Annual Target Bonus Opportunity			Bonus awards are discretionary. Target bonus of $2,200,000 commencing with the 2026 performance year (awarded in February 2027). Actual bonus may range from 0% - 200% of target, based on achievement of individual and Guy Carpenter and/or Marsh performance objectives, as Marsh may establish from time to time
Annual Target Long-Term Incentive Opportunity			Long-term incentive awards are discretionary. Target grant date fair value of $2,000,000 commencing with the award granted in 2025.
Other Benefits			You will have access to a car and driver for business purposes and work/home travel. If the imputed income attributable to this benefit is taxable to you, then the taxes associated with this taxable income will not be reimbursed or paid by Marsh.