Fifth Amendment to the Amended and Restated Aon Deferred Compensation Plan, effective October 1, 2021

This Fifth Amendment (“Amendment”) to the Aon Deferred Compensation Plan, as amended and restated effective November 17, 2016 (the “Plan”), is adopted by Aon Corporation, a Delaware corporation (the “Company”) and wholly owned subsidiary of Aon plc, (“Aon”), to be effective as set forth below.

WHEREAS, pursuant to Section 6.05 of the Plan, the Board of Directors of the Company (the “Board”) has the authority to amend the Plan, and, pursuant to Section 1.04 of the Plan, the Organization and Compensation Committee of Aon (the “OCC“) has authority to act for the Board with respect to the Plan; and

WHEREAS, pursuant to resolutions of the OCC dated June 13, 2016, the OCC delegated authority to Aon’s Administrative Committee (the “Committee”) to make certain amendments to the Plan; and

WHEREAS, pursuant to the resolutions of the Committee dated September 14, 2021, the Committee approved, and delegated to Company management authority to execute, an amendment of the Plan to effect a partial Plan termination with respect to certain participants.

NOW THEREFORE, the Plan is hereby amended, effective as of October 1, 2021, by adding the following as a new Supplement B to the Plan:

1.Partial Plan Termination – Retiree Health Exchange. The Plan shall be terminated and liquidated, effective October 1, 2021, solely with respect to all Participants who experienced a “change in control event” (within the meaning of Code Section 409A) in connection with the sale of the Aon Retiree Health Exchange. Such termination and liquidation will be administered in accordance with Section 1.409A-3(j)(4)(ix)(B), with the entire vested balance of each such Participant’s account, determined as of February 28, 2022, to be distributed no later than March 15, 2022.

In addition, the Committee is authorized to make any additional adjustments to the plan document language to effect the intent of the foregoing, including but not limited to providing a restatement of the plan document incorporating such changes and all previous amendments.

IN WITNESS WHEREOF, the Company has caused the Fifth Amendment to be executed on its behalf by its duly authorized officers, this 16th day of December 2021.

By:                            

Lisa Stevens

Chief People Officer