EX-10.1

FILING DETAILS

Filer

Aon plc

Period of report

Jun 26, 2026

Filed

Jul 01, 2026

SEC file no.

001-07933

State of inc.

SIC

6411

Location

DUBLIN 2, L2

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Submission of Matters to a Vote of Security Holders

Other Events

Financial Statements and Exhibits

EX-10.1

Exhibit 10.1

LOGO

Gregory Case

Aon Corporation

United States

June 26, 2026

International Assignment Extension: Chicago, Illinois to London, England

Dear Greg,

This letter serves to amend your international assignment letter effective July 1, 2016, governing the terms of your international assignment from Chicago, Illinois to Aon Global Limited in London, England (your “International Assignment Letter”).

Pursuant to this letter, the term of your international assignment shall be extended an additional one year, through June 30, 2027.

Except as otherwise expressly modified herein, the terms of the International Assignment Letter, and your acknowledgment and acceptance thereof, shall continue in full force and effect.

Please confirm acceptance of the terms and conditions of this letter by signing below and returning a copy of the signed letter to me.

Sincerely,

/s/ Lisa Stevens

Lisa Stevens

Chief Administrative Officer

Acknowledged and Agreed:

/s/ Gregory Case

Gregory Case