AON / Aon plc - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

Aon plc
US ˙ NYSE ˙ IE00BLP1HW54

Mga Batayang Estadistika
LEI 635400FALWQYX5E6QC64
CIK 315293
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Aon plc
SEC Filings (Chronological Order)
Halaman ini menyediakan daftar lengkap dan kronologis dari Pengajuan SEC, tidak termasuk pengajuan kepemilikan yang kami sediakan di tempat lain.
September 3, 2025 EX-99.1

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EX-99.1 Exhibit 99.1 Aon Signs Definitive Agreement to Sell Significant Majority of NFP’s Wealth Business to Madison Dearborn Partners • The agreement includes Wealthspire Advisors, Fiducient Advisors, Newport Private Wealth and related platforms • Transaction reinforces Aon’s focus on core Risk Capital and Human Capital capabilities and presence in the middle market • Madison Dearborn Partners to

September 3, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): September 3, 2025 Aon plc (Exact

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): September 3, 2025 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Emp

August 4, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 1, 2025 Aon plc (Exact Nam

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 1, 2025 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employ

July 29, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 29, 2025 Aon plc (Exact Name

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 29, 2025 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employe

July 25, 2025 EX-FILING FEES

Filing Fee Table.

Exhibit 107.1 Calculation of Filing Fee Tables Form S-8 (Form Type) Aon plc (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities  Security Type  Security Class Title Fee Calculation Rule Amount Registered (1) Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Equity Class A Ordinary Shares, par value

July 25, 2025 EX-22.1

Subsidiary Guarantors and Issuers of Guaranteed Securities.

Exhibit 22.1 Subsidiary Guarantors and Issuers of Guaranteed Securities The table below sets forth the respective issuers, co-issuers, and guarantors of the notes issued by Aon Global Limited, Aon Global Holdings plc, and Aon Corporation and the jurisdiction of incorporation of each such entity. Aon Corporation Aon Global Limited Aon North America, Inc. Aon Corporation and Aon Global Holdings plc

July 25, 2025 S-8

As filed with the Securities and Exchange Commission on July 25, 2025

S-8 As filed with the Securities and Exchange Commission on July 25, 2025 No. 333-    UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 AON PLC (Exact name of registrant as specified in its charter) Ireland 98-1539969 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification

July 25, 2025 EX-10.4

International Assignment Letter, effective July 1, 2023, between Aon Service Corporation and Mindy Simon.

Mindy Simon Aon Service Corporation 23 March 2023 Dear Mindy, Long Term Assignment to the United Kingdom Further to our recent discussions, I am writing to invite you to accept an assignment to Aon Global Limited (“the Host”) on the terms set out below.

July 25, 2025 EX-99.1

Aon Reports Second Quarter 2025 Results

Exhibit 99.1 News from Aon Aon Reports Second Quarter 2025 Results DUBLIN - July 25, 2025 - Aon plc (NYSE: AON) today reported results for the three months ended June 30, 2025. •Aon delivered another quarter of strong performance, including 11% total revenue growth and 6% organic revenue growth. We are executing our Aon United strategy through the 3x3 Plan to meet client demand •Strong Free Cash F

July 25, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 25, 2025 Aon plc (Exact Name

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 25, 2025 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employe

July 25, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2025 ☐ TRANSITION REPORT PURSUANT TO S

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 1-7933 Aon plc (Exact Name of Registrant as Specified in Its Chart

July 25, 2025 EX-10.5

Amendment to International Assignment Letter, dated June 24, 2024, between Aon Service Corporation and Mindy Simon.

Docusign Envelope ID: CF2E3D34-6939-4548-A5CA-CA3244E74AA7 Mindy Simon Aon Service Corporation June 24, 2024 International Assignment Extension – Omaha, United States to London, United Kingdom Dear Mindy, This letter serves to amend your international assignment letter dated March 23, 2023, governing the terms of your international assignment from Omaha, United States to London, United Kingdom (your “International Assignment Letter”).

July 25, 2025 EX-10.3

Letter Agreement, dated August 1, 2022, between Aon Corporation and Mindy Simon.

DocuSign Envelope ID: 94AB81EE-04E9-4D9B-A0D5-3753303233EE August 1, 2022 Private and Confidential Mindy Simon [Email Address] Dear Mindy, Aon Corporation (the “Company”) is pleased to present in this Employment Offer Letter (this “Letter”) the terms of your employment as Chief Operating Officer of Aon plc.

July 3, 2025 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 27, 2025 Aon plc (Exact name of registrant as specified in its charter) Ireland 1-7933 98-1539969 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Emp

July 3, 2025 EX-10.2

Aon plc 2011 Incentive Plan, as Amended and Restated.

Exhibit 10.2 AON PLC 2011 INCENTIVE PLAN (As Amended and Restated Effective April 18, 2025) SECTION 1 General 1.1. Purpose. Aon plc, an Irish public limited company (the “Company”), maintains the Plan to advance the interests of the Company and the Subsidiaries by providing a variety of equity-based and cash incentives designed to motivate, retain and attract employees, directors, consultants, ind

July 3, 2025 EX-10.1

Amendment to International Assignment Letter, dated June 27, 2025, between Aon Corporation and Greg Case.

EX-10.1 Exhibit 10.1 Gregory Case Aon Corporation United States June 27, 2025 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 London, England (your “International Assignment Letter”). Pursuant to

April 28, 2025 DEFA14A

SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO.  )

SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO.

April 28, 2025 DEF 14A

SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO.  )

Table of Contents SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO.

April 25, 2025 EX-22.1

Subsidiary Guarantors and Issuers of Guaranteed Securities.

Exhibit 22.1 Subsidiary Guarantors and Issuers of Guaranteed Securities The table below sets forth the respective issuers, co-issuers, and guarantors of the notes issued by Aon Global Limited, Aon Global Holdings plc, and Aon Corporation and the jurisdiction of incorporation of each such entity. Aon Corporation Aon Global Limited Aon North America, Inc. Aon Corporation and Aon Global Holdings plc

April 25, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2025 ☐ TRANSITION REPORT PURSUANT TO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 1-7933 Aon plc (Exact Name of Registrant as Specified in Its Char

April 25, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 25, 2025 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employ

April 25, 2025 EX-99.1

Aon Reports First Quarter 2025 Results

Exhibit 99.1 Investor Relations News from Aon Aon Reports First Quarter 2025 Results DUBLIN - April 25, 2025 - Aon plc (NYSE: AON) today reported results for the three months ended March 31, 2025. •Aon delivered 16% Total revenue growth and another quarter of mid-single-digit Organic revenue growth, which reached 5%. EPS was $4.43 and Adjusted EPS was $5.67 •Free Cash Flow generation enabled conti

April 10, 2025 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 7, 2025 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employe

March 17, 2025 EX-99.1

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Exhibit 99.1 Aon Announces Transition of President DUBLIN, March 17, 2025 – Aon plc (NYSE: AON), a leading global professional services firm, announced today that Eric Andersen has transitioned from his role as president to serve as a senior advisor to Greg Case, CEO of Aon, through June 2026. The role of president has been assumed by Case. Andersen joined Aon with the firm’s acquisition of Minet

March 17, 2025 EX-10.1

Amendment to Employment Agreement, dated as of March 14, 2025, by and among Aon plc, Aon Corporation and Gregory C. Case.

Exhibit 10.1 AMENDMENT TO EMPLOYMENT AGREEMENT This Amendment to Employment Agreement (this “Amendment”), effective as of March 14, 2025, attaches to and forms part of that certain Amended and Restated Employment Agreement dated as of January 16, 2015 (the “Agreement”), as amended April 20, 2018, May 15, 2018, July 26, 2021, and April 2, 2024, among Aon Corporation, a Delaware corporation (the “Co

March 17, 2025 8-K

Regulation FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 14, 2025 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employ

March 13, 2025 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 13, 2025 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employ

February 18, 2025 EX-10.78

Eighth Amendment to the Aon Supplemental Savings Plan, effective August 1, 2024.

Docusign Envelope ID: CB73008D-B0D1-4DD7-81A0-0C557CE6E723 EXECUTION VERSION EIGHTH AMENDMENT TO THE AON SUPPLEMENTAL SAVINGS PLAN (As amended and restated effective January 1, 2017) This Eighth Amendment to the Aon Supplemental Savings Plan, as amended and restated as of January 1, 2017 (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.

February 18, 2025 EX-22.1

Subsidiary Guarantors and Issuers of Guaranteed Securities

Exhibit 22.1 Subsidiary Guarantors and Issuers of Guaranteed Securities The table below sets forth the respective issuers, co-issuers, and guarantors of the notes issued by Aon Global Limited, Aon Global Holdings plc, and Aon Corporation and the jurisdiction of incorporation of each such entity. Aon Corporation Aon Global Limited Aon North America, Inc. Aon Corporation and Aon Global Holdings plc

February 18, 2025 EX-10.15

First Amendment to the Aon Corporation Outside Director Bequest Plan, effective November 22, 2024.

EXHIBIT A FIRST AMENDMENT TO THE AON CORPORATION OUTSIDE DIRECTOR CORPORATE BEQUEST PLAN This First Amendment (the “Amendment”) to the Aon Corporation Outside Director Corporate Bequest Plan, as amended and restated effective January 1, 2010 (the “Plan”), is adopted by Aon plc, a public limited company incorporated under Irish law (the “Company”), to be effective as set forth below.

February 18, 2025 EX-21.1

List of Subsidiaries of Aon.

Aon plc - Worldwide Subsidiaries as of December 31, 2024 Exhibit 21 Name State/Province Country Admiseg S.

February 18, 2025 EX-19.1

Aon plc Insider Trading Policy.

Aon plc Insider Trading Policy Aon plc (“Aon” or the “Company”) has adopted this Insider Trading Policy (the “Policy”) to promote compliance with securities laws, to prevent insider trading or allegations of insider trading, and to protect the reputation of Aon and those covered by the Policy for integrity and ethical conduct.

February 18, 2025 EX-97.1

Aon plc Incentive Repayment Policy (For Section 16 Officers), effective as of October 2, 2023 - incorporated by reference to Aon's Annual Report on Form 10-K for the year ended December 31, 2023.

Aon plc Incentive Repayment Policy (For Section 16 Officers) 1.Introduction In accordance with Section 10D of the Securities Exchange Act of 1934, as amended, and the regulations thereunder, the independent members of the Board of Directors (the “Board”) of Aon plc (the “Company”) have adopted this Incentive Repayment Policy (For Section 16 Officers) (this “Policy”) providing for the Company’s rec

February 18, 2025 EX-4.16

Description of Securities of Aon plc that are registered under Section 12 of the Securities Exchange Act of 1934, as amended.

Exhibit 4.25 Description of the Share Capital of Aon Ireland Set forth below is a summary of the material terms of the share capital of Aon plc, an Irish public limited company ("Aon Ireland"). The summary is subject to the Companies Act 2014 of Ireland, as amended (the "Irish Companies Act"), and is qualified in its entirety by reference to the Aon Ireland Constitution, which is filed as Exhibit

February 18, 2025 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2024 OR ☐ TRANSITION REPORT PUR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number: 1-7933 Aon plc (Exact name of registrant as specified in i

February 18, 2025 EX-10.67

Seventh Amendment to the Amended and Restated Aon Deferred Compensation Plan, effective August 1, 2024.

Docusign Envelope ID: CB73008D-B0D1-4DD7-81A0-0C557CE6E723 EXECUTION VERSION SEVENTH AMENDMENT TO THE AON DEFERRED COMPENSATION PLAN This Seventh 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.

January 31, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): January 31, 2025 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Empl

January 31, 2025 EX-99.1

Aon Reports Fourth Quarter and Full Year 2024 Results

Investor Relations News from Aon Aon Reports Fourth Quarter and Full Year 2024 Results DUBLIN - January 31, 2025 - Aon plc (NYSE: AON) today reported results for the three and twelve months ended December 31, 2024.

November 13, 2024 SC 13G

AON / Aon plc / Capital World Investors - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Aon PLC (Name of Issuer) Common Stock (Title of Class of Securities) G0403H108 (CUSIP Number) September 30, 2024 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is fil

October 25, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 25, 2024 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Empl

October 25, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2024 ☐ TRANSITION REPORT PURSUANT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 1-7933 Aon plc (Exact Name of Registrant as Specified in Its

October 25, 2024 EX-22.1

Subsidiary Guarantors and Issuers of Guaranteed Securities.

Exhibit 22.1 Subsidiary Guarantors and Issuers of Guaranteed Securities The table below sets forth the respective issuers, co-issuers, and guarantors of the notes issued by Aon Global Limited, Aon Global Holdings plc, and Aon Corporation and the jurisdiction of incorporation of each such entity. Aon Corporation Aon Global Limited Aon North America, Inc. Aon Corporation and Aon Global Holdings plc

October 25, 2024 EX-99.1

Aon Reports Third Quarter 2024 Results

Exhibit 99.1 Investor Relations News from Aon Aon Reports Third Quarter 2024 Results Third Quarter Key Metrics •Total revenue was $3.7 billion, including organic revenue growth of 7% •Operating margin was 16.7%, and adjusted operating margin increased to 24.6% •EPS was $1.57, and adjusted EPS increased to $2.72 •For the first nine months of 2024, cash flows from operations was $1,835 million, and

August 9, 2024 8-K

Entry into a Material Definitive Agreement

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 5, 2024 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employ

July 26, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2024 ☐ TRANSITION REPORT PURSUANT TO S

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 1-7933 Aon plc (Exact Name of Registrant as Specified in Its Chart

July 26, 2024 EX-99.1

Aon Reports Second Quarter 2024 Results

Exhibit 99.1 Investor Relations News from Aon Aon Reports Second Quarter 2024 Results Second Quarter Key Metrics •Total revenue increased 18% to $3.8 billion, including organic revenue growth of 6% •Operating margin decreased 910 basis points to 17.4%, and adjusted operating margin increased 10 basis points to 27.4% •EPS decreased 9% to $2.46, and adjusted EPS increased 6% to $2.93 •For the first

July 26, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 26, 2024 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employe

July 26, 2024 EX-22.1

Subsidiary Guarantors and Issuers of Guaranteed Securities

Exhibit 22.1 Subsidiary Guarantors and Issuers of Guaranteed Securities The table below sets forth the respective issuers, co-issuers, and guarantors of the notes issued by Aon Global Limited, Aon Global Holdings plc, and Aon Corporation and the jurisdiction of incorporation of each such entity. Aon Corporation Aon Global Limited Aon North America, Inc. Aon Corporation and Aon Global Holdings plc

June 26, 2024 EX-10.1

Amendment to International Assignment Letter, dated June 24, 2024, between Aon Corporation and Greg Case.

Exhibit 10.1 Gregory Case Aon Corporation United States June 24, 2024 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 London, England (your “International Assignment Letter”). Pursuant to this le

June 26, 2024 EX-10.2

Transition Agreement, dated June 24, 2024, between Aon Corporation and Christa Davies.

Exhibit 10.2 June 21, 2024 Christa Davies Aon Corporation United States Dear Christa: This letter agreement (“Agreement”) sets forth the terms and conditions of your employment with Aon Corporation, a Delaware corporation (the “Company”) in connection with your retirement from the position of Executive Vice President and Chief Financial Officer and your service to Aon (as defined below) as a senio

June 26, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 21, 2024 Aon plc (Exact name of registrant as specified in its charter) Ireland 1-7933 98-1539969 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Emp

June 14, 2024 EX-99.25

EX-99.25

NOTIFICATION OF THE REMOVAL FROM LISTING AND REGISTRATION OF THE STATED SECURITIES The New York Stock Exchange hereby notifies the SEC of its intention to remove the entire class of the stated securities from listing and registration on the Exchange at the opening of business on June 25, 2024, pursuant to the provisions of Rule 12d2-2 (a).

June 4, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 30, 2024 Aon plc (Exact Name

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 30, 2024 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer

June 4, 2024 EX-99.1

Aon appoints Edmund Reese to serve as next CFO

EX-99.1 Exhibit 99.1 Aon appoints Edmund Reese to serve as next CFO • Reese will bring more than 25 years of financial leadership at large public companies in the financial services, payments and technology sectors, most recently as CFO of Broadridge Financial Solutions • Aon CFO Christa Davies will certify second quarter 2024 results and then become a senior advisor to the firm until her previous

June 4, 2024 EX-10.1

Letter Agreement, dated as of May 30, 2024, by and between Aon Corporation and Edmund Reese.

EX-10.1 Exhibit 10.1 May 30, 2024 Private and Confidential Edmund Reese [Email] Dear Edmund, Aon Corporation (the “Company”) is pleased to present in this Employment Offer Letter (this “Letter”) the terms of your employment as Chief Financial Officer of Aon plc. Subject to your acceptance of this Letter, your employment pursuant to this Letter will be deemed to have commenced as of July 1, 2024 (“

May 21, 2024 DEFA14A

SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO. )

SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO.

April 29, 2024 DEFA14A

SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO.  )

SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO.

April 29, 2024 DEF 14A

SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO.  )

SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO.

April 26, 2024 EX-22.1

Subsidiary Guarantors and Issuers of Guaranteed Securities

Exhibit 22.1 Subsidiary Guarantors and Issuers of Guaranteed Securities The table below sets forth the respective issuers, co-issuers, and guarantors of the notes issued by Aon Global Limited, Aon Global Holdings plc, and Aon Corporation and the jurisdiction of incorporation of each such entity. Aon Corporation Aon Global Limited Aon North America, Inc. Aon Corporation and Aon Global Holdings plc

April 26, 2024 EX-10.3

Form of Restricted Stock Unit Agreement

RESTRICTED STOCK UNIT AGREEMENT UNDER THE AON PLC 2011 INCENTIVE PLAN This Restricted Stock Unit Agreement, including Appendices A, B and C attached hereto (the “Agreement”), is entered into between Aon plc, a public limited company incorporated under Irish law (the “Company” or “Aon”) and (the “Participant”).

April 26, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 26, 2024 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employ

April 26, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2024 ☐ TRANSITION REPORT PURSUANT TO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 1-7933 Aon plc (Exact Name of Registrant as Specified in Its Char

April 26, 2024 EX-99.1

Aon Reports First Quarter 2024 Results

Exhibit 99.1 Investor Relations News from Aon Aon Reports First Quarter 2024 Results First Quarter Key Metrics •Total revenue increased 5% to $4.1 billion, including organic revenue growth of 5% •Operating margin decreased 210 basis points to 36.0%, and operating margin, adjusted for certain items, increased 100 basis points to 39.7% •EPS increased 6% to $5.35, and EPS, adjusted for certain items,

April 26, 2024 EX-10.2

Aon plc Leadership Performance Program (as amended and restated, effective January 1, 2024).

Table of Contents Performance Award Certificate 3 Appendix A 4 Appendix B-1 [omitted] 10 Appendix B-2 [omitted] 17 Appendix B-3 [omitted] 23 Appendix C [omitted] 27 LPP Plan Document 56 LPP Goals and Payout Scales For 2024-2026 LPP [omitted] 63 LPP 2024-2026 LEADERSHIP PERFORMANCE PROGRAM PERFORMANCE AWARD CERTIFICATE In Connection with the Performance Cycle January 1, 2024 through December 31, 20

April 25, 2024 8-K

Regulation FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 25, 2024 Aon plc (Exact name of Registrant as specified in its charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation or Organization) Commission File Number (I.

April 25, 2024 EX-99.2

Fixed Price Notes Title of Security CUSIPs/ISINs Principal Amount Outstanding Tender Consideration(1) Early Tender Payment(1) Total Consideration(1)(2) Principal Amount Tendered 6.875% Senior Notes due 2028 CUSIP Nos.: 65342R AD2, U65103 AF7, U6510P

Exhibit 99.2 Aon Announces Early Settlement Date and Total Consideration for its Cash Tender Offers and Related Consent Solicitations for Outstanding Debt Securities of NFP Corp. DUBLIN (April 25, 2024) – Aon plc (NYSE: AON) (“Aon”), a leading global professional services firm, announced today (i) the expected early settlement date of April 26, 2024 (the “Early Settlement Date”) for the previously

April 25, 2024 EX-99.1

ENDS

Exhibit 99.1 Aon completes acquisition of NFP to bring more capability to clients — Faster-than-anticipated close contributes to accretion and free cash flow benefit realization a year earlier than modeled — As an Aon company, NFP will operate as an independent and connected platform delivering Risk Capital and Human Capital capabilities — Enterprise value of $13.0 billion, including $7.0 billion

April 23, 2024 424B3

The date of this prospectus is April 19, 2024.

Table of Contents Filed Pursuant to Rule 424(b)(3) Registration No. 333-277342 December 19, 2023, Aon plc, an Irish public limited company (“Aon”), Randolph Acquisition Corp., a Delaware corporation and an indirect, wholly owned subsidiary of Aon (“Acquirer”), and Randolph Merger Sub LLC, a Delaware limited liability company and a direct, wholly owned subsidiary of Acquirer (“Merger Sub”), entered

April 19, 2024 8-K

Regulation FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 19, 2024 Aon plc (Exact name of Registrant as specified in its charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation or Organization) Commission File Number (I.

April 19, 2024 EX-10.3

Amendment No. 4 to the Credit Agreement, dated as of September 28, 2021, by and among Aon plc, Aon Global Limited, Aon Global Holdings plc, Aon Corporation, Aon North America, Inc., Aon UK Limited, Citibank, N.A., as administrative agent, and the lenders party thereto (Incorporated by reference to Exhibit 10.3 to Aon plc’s Current Report on Form 8-K filed with the SEC on April 19, 2024).

Exhibit 10.3 Execution Version AMENDMENT NO. 4 TO THE CREDIT AGREEMENT Dated as of April 16, 2024 AMENDMENT NO. 4 TO THE CREDIT AGREEMENT (this “Amendment”) among Aon Corporation, a Delaware corporation (the “Borrower Representative”), the Lenders (as defined below) party hereto and Citibank, N.A., as administrative agent (the “Administrative Agent”) for the Lenders PRELIMINARY STATEMENTS: (1) The

April 19, 2024 EX-10.1

Amendment No. 1 to the Term Loan Credit Agreement, dated as of February 16, 2024, by and among Aon plc, Aon Corporation, Aon Global Holdings plc, Aon Global Limited and Aon North America, Inc., Citibank, N.A., as administrative agent, and the lenders party thereto (Incorporated by reference to Exhibit 10.1 to Aon plc’s Current Report on Form 8-K filed with the SEC on April 19, 2024).

Exhibit 10.1 Execution Version AMENDMENT NO. 1 TO THE TERM LOAN CREDIT AGREEMENT Dated as of April 16, 2024 AMENDMENT NO. 1 TO THE TERM LOAN CREDIT AGREEMENT (this “Amendment”) among Aon North America, Inc., a Delaware corporation (the “Borrower”), the Lenders (as defined below) party hereto and Citibank, N.A., as administrative agent (the “Administrative Agent”) for the Lenders PRELIMINARY STATEM

April 19, 2024 S-4/A

As filed with the Securities and Exchange Commission on April 19, 2024

Table of Contents As filed with the Securities and Exchange Commission on April 19, 2024 Registration No.

April 19, 2024 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 16, 2024 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 001-07933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Emp

April 19, 2024 CORRESP

Aon plc 200 East Randolph Street Chicago, IL 60601 (312) 381-1000

Aon plc 200 East Randolph Street Chicago, IL 60601 (312) 381-1000 Via EDGAR United States Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.

April 19, 2024 EX-10.2

Amendment No. 2 to the Credit Agreement, dated as of October 19, 2023, by and among Aon plc, Aon Corporation, Aon Global Holdings plc, Aon Global Limited and Aon North America, Inc., Citibank, N.A., as administrative agent, and the lenders party thereto (Incorporated by reference to Exhibit 10.2 to Aon plc’s Current Report on Form 8-K filed with the SEC on April 19, 2024).

Exhibit 10.2 Execution Version AMENDMENT NO. 2 TO THE CREDIT AGREEMENT Dated as of April 16, 2024 AMENDMENT NO. 2 TO THE CREDIT AGREEMENT (this “Amendment”) among Aon Corporation, a Delaware corporation (the “Borrower Representative”), the Lenders (as defined below) party hereto and Citibank, N.A., as administrative agent (the “Administrative Agent”) for the Lenders PRELIMINARY STATEMENTS: (1) The

April 18, 2024 CORRESP

* * *

April 18, 2024 VIA EMAIL AND EDGAR Securities and Exchange Commission Division of Corporation Finance Office of Finance Washington, D.

April 17, 2024 10-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549                        FORM 10-K/A (Amendment No. 1) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2

Table of Contents Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549                        FORM 10-K/A (Amendment No.

April 16, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 15, 2024 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 001-07933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Emp

April 16, 2024 EX-99.1

Fixed Price Notes

Exhibit 99.1 Aon Announces Early Results of and Reference Yields for its Cash Tender Offers and Related Consent Solicitations for Outstanding Debt Securities of NFP Corp. DUBLIN (April 15, 2024) – Aon plc (NYSE: AON) (“Aon”), a leading global professional services firm, announced today (i) the early tender results as of the previously announced early tender deadline of 5:00 p.m., New York City tim

April 3, 2024 EX-10.1

Amendment to Employment Agreement, dated as of April 2, 2024, by and among Aon plc, Aon Corporation and Gregory C. Case (Incorporated by reference to Exhibit 10.1 to Aon plc’s Current Report on Form 8-K filed with the SEC on April 3, 2024).

Exhibit 10.1 AMENDMENT TO EMPLOYMENT AGREEMENT This Amendment to Employment Agreement (this “Amendment”), effective as of April 2, 2024, attaches to and forms part of that certain Amended and Restated Employment Agreement dated as of January 16, 2015, as amended on April 20, 2018, May 15, 2018, and July 26, 2021 (the “Agreement”), among Aon Corporation, a Delaware corporation (the “Company”), Aon

April 3, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 1, 2024 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employe

April 2, 2024 EX-99.1

Fixed Price Notes

Exhibit 99.1 Aon Announces Commencement of Cash Tender Offers and Related Consent Solicitations for Outstanding Debt Securities of NFP Corp. (April 2, 2024) – Aon plc (NYSE: AON) (“Aon”), a leading global professional services firm, announced today that its wholly owned subsidiary, Randolph Acquisition Corp. (the “Offeror”), has commenced cash tender offers for any and all of the outstanding 6.875

April 2, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 2, 2024 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 001-07933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Empl

March 29, 2024 S-4/A

As filed with the Securities and Exchange Commission on March 29, 2024

Table of Contents As filed with the Securities and Exchange Commission on March 29, 2024 Registration No.

March 29, 2024 CORRESP

* * *

March 29, 2024 VIA EMAIL AND EDGAR Securities and Exchange Commission Division of Corporation Finance Office of Finance Washington, D.

March 27, 2024 EX-10.1

Aon plc Leadership Performance Program (as amended and restated, effective January 1, 2024).

Exhibit 10.1 AON PLC LEADERSHIP PERFORMANCE PROGRAM As Amended and Restated Effective January 1, 2024 1. Overview The Leadership Performance Program (the “Program”) of Aon plc (the “Company”) has been adopted by the Organization and Compensation Committee of the Company’s Board of Directors (the “Committee) as a sub-plan of the Aon plc 2011 Incentive Plan, as it may be amended from time to time (t

March 27, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 21, 2024 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employ

March 1, 2024 EX-4.1

Base Indenture, dated as of March 1, 2024, among Aon North America, Inc., Aon plc, Aon Corporation, Aon Global Holdings plc, Aon Global Limited and The Bank of New York Mellon Trust Company, N.A. (Incorporated by reference to Exhibit 4.1 to Aon plc’s Current Report on Form 8-K filed with the SEC on March 1, 2024).

Exhibit 4.1 EXECUTION VERSION AON NORTH AMERICA, INC. Company the Co-Issuer(s) party hereto the Guarantors party hereto and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. Trustee INDENTURE Dated as of March 1, 2024 Debt Securities CROSS-REFERENCE SHEET* BETWEEN Provisions of Sections 310 through 318(a) of the Trust Indenture Act of 1939 and the within Indenture among Aon North America, Inc., the

March 1, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 28, 2024 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Emp

March 1, 2024 EX-5.3

Consent of Matheson LLP (included in Exhibit 5.3).

EX-5.3 Exhibit 5.3 Aon plc Metropolitan Building James Joyce Street Dublin 1 Ireland Our ref 1 March 2024 FBO/AOC 659500-51 Dear Sirs Registration, offer and sale of certain Senior Notes by Aon North America, Inc., as guaranteed by Aon plc, Aon Corporation, Aon Global Holdings plc and Aon Global Limited We have acted as Irish counsel to Aon plc, a public limited company incorporated under the laws

March 1, 2024 EX-1.1

Underwriting Agreement, dated as of February 28, 2024, among the Issuer, the Guarantors and the Underwriters.

Exhibit 1.1 Aon North America, Inc. Aon plc Aon Corporation Aon Global Limited Aon Global Holdings plc $600,000,000 5.125% Senior Notes due 2027 $1,000,000,000 5.150% Senior Notes due 2029 $650,000,000 5.300% Senior Notes due 2031 $1,750,000,000 5.450% Senior Notes due 2034 $2,000,000,000 5.750% Senior Notes due 2054 UNDERWRITING AGREEMENT February 28, 2024 Citigroup Global Markets Inc. Morgan Sta

March 1, 2024 EX-4.2

First Indenture Supplement, dated as of March 1, 2024, among Aon North America, Inc., Aon plc, Aon Corporation, Aon Global Holdings plc, Aon Global Limited and The Bank of New York Mellon Trust Company, N.A. (Incorporated by reference to Exhibit 4.2 to Aon plc’s Current Report on Form 8-K filed with the SEC on March 1, 2024).

Exhibit 4.2 EXECUTION VERSION AON NORTH AMERICA, INC. FIRST INDENTURE SUPPLEMENT DATED AS OF MARCH 1, 2024 TO THE INDENTURE DATED AS OF MARCH 1, 2024 THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. TRUSTEE DEBT SECURITIES THIS FIRST INDENTURE SUPPLEMENT (the “First Indenture Supplement”), is dated as of March 1, 2024, among Aon North America, Inc., a corporation duly organized and existing under t

March 1, 2024 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registr

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registrant as Specified in Its Charter) (Exact Name of Registrant as Specified in Its Charter) Ireland England and Wales (Jurisdiction of Incorporation or Organization) (Jurisdiction of Incorporation or Organization) 98-1539969 98-1030901 (I.

February 29, 2024 EX-FILING FEES

Calculation of Filing Fee Tables (Form Type) Aon plc (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registe

Exhibit 107 Calculation of Filing Fee Tables 424(b)(5) (Form Type) Aon plc (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid In Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to Be Paid Debt 5.

February 29, 2024 424B5

Aon North America, Inc. $600,000,000 5.125% Senior Notes due 2027 $1,000,000,000 5.150% Senior Notes due 2029 $650,000,000 5.300% Senior Notes due 2031 $1,750,000,000 5.450% Senior Notes due 2034 $2,000,000,000 5.750% Senior Notes due 2054 with full

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration Statement Nos. 333-272818, 333-272818-01, 333-272818-02, 333-272818-03, 333-272818-04 Prospectus Supplement (To Prospectus dated June 22, 2023) Aon North America, Inc. $600,000,000 5.125% Senior Notes due 2027 $1,000,000,000 5.150% Senior Notes due 2029 $650,000,000 5.300% Senior Notes due 2031 $1,750,000,000 5.450% Senior Notes due 2

February 29, 2024 FWP

Aon North America, Inc. $600,000,000 5.125% SENIOR NOTES DUE 2027 (the “2027 Notes”) $1,000,000,000 5.150% SENIOR NOTES DUE 2029 (the “2029 Notes”) $650,000,000 5.300% SENIOR NOTES DUE 2031 (the “2031 Notes”) $1,750,000,000 5.450% SENIOR NOTES DUE 20

FWP Filed pursuant to Rule 433 Relating to Preliminary Prospectus Supplement dated February 27, 2024 to Prospectus dated June 22, 2023 Registration Statement Nos.

February 27, 2024 424B5

Subject to completion, dated February 27, 2024

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration Statement Nos. 333-272818, 333-272818-01, 333-272818-02, 333-272818-03, 333-272818-04 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and are not soliciting an offer to buy thes

February 26, 2024 EX-FILING FEES

Filing Fee Table.

EX-FILING FEES Exhibit 107 Calculation of Filing Fee Tables Form S-4 (Form Type) Aon plc (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities and Carry Forward Securities Security Type Security Class Title Fee Calculation Rule Amount Registered Proposed Maximum Offering Price Per Share(2) Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Newly Registered Securities Fees to be Paid Equity Class A Ordinary Shares, nominal value $0.

February 26, 2024 EX-4.1

Form of Aon Ordinary Share certificate.

Exhibit 4.1

February 26, 2024 S-4

As filed with the Securities and Exchange Commission on February 26, 2024

Table of Contents As filed with the Securities and Exchange Commission on February 26, 2024 Registration No.

February 21, 2024 EX-99.1

ENDS

Exhibit 99.1 Aon and NFP issue joint statement about the expiration of Hart-Scott-Rodino Antitrust Act waiting period for proposed acquisition agreement DUBLIN, 21 February 2024 – Aon plc (NYSE: AON), a leading global professional services firm, and NFP, a leading middle market property and casualty broker, benefits consultant, wealth manager and retirement plan advisor, announced today that the w

February 21, 2024 8-K

Regulation FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): February 21, 2024 Aon plc (Exact name of Registrant as specified in its charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation or Organization) Commission File Number (I.

February 16, 2024 EX-10.5

Amendment No. 1 to the Credit Agreement, dated as of May 3, 2023, by and among Citibank, N.A., as administrative agent, Aon Corporation, Aon UK Limited, Aon Global Holdings plc and Aon Global Limited, and the lenders party thereto — incorporated by reference to Exhibit 10.4 to Aon’s Quarterly Report on Form 10 Q filed July 28, 2023.

Exhibit 10.4 Execution Version 1 AMENDMENT NO. 1 TO THE CREDIT AGREEMENT Dated as of May 3, 2023 AMENDMENT NO. 1 TO THE CREDIT AGREEMENT (this “Amendment”) by Citibank, N.A., as administrative agent (the “Administrative Agent”). PRELIMINARY STATEMENTS: (1) Aon plc, a public limited company organized under the laws of Ireland (the “Parent”), Aon Corporation, a Delaware corporation (“Aon Corporation

February 16, 2024 EX-10.4

Amendment No. 3 to the Credit Agreement, dated as of February 16, 2024, by and among Aon plc, Aon Corporation,

Execution Version AMENDMENT NO. 3 TO THE CREDIT AGREEMENT Dated as of February 16, 2024 AMENDMENT NO. 3 TO THE CREDIT AGREEMENT (this “Amendment”) among Aon Corporation, a Delaware corporation (the “Borrower Representative”), the Lenders (as defined below) party hereto and Citibank, N.A., as administrative agent (the “Administrative Agent”) for the Lenders PRELIMINARY STATEMENTS: (1) The Borrower

February 16, 2024 EX-22.1

Subsidiary Guarantors and Issuers of Guaranteed Securities

Exhibit 22.1 Subsidiary Guarantors and Issuers of Guaranteed Securities The table below sets forth the respective issuers, co-issuers, and guarantors of the notes issued by Aon Global Limited, Aon Global Holdings plc, and Aon Corporation and the jurisdiction of incorporation of each such entity. Aon Corporation Aon Global Limited Aon Corporation and Aon Global Holdings plc Entity Jurisdiction of I

February 16, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2023 OR ☐ TRANSITION REPORT PUR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number: 1-7933 Aon plc (Exact name of registrant as specified in i

February 16, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 13, 2024 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Emp

February 16, 2024 EX-97.1

Aon plc Incentive Repayment Policy (For Section 16 Officers), effective as of October 2, 2023.

Aon plc Incentive Repayment Policy (For Section 16 Officers) 1.Introduction In accordance with Section 10D of the Securities Exchange Act of 1934, as amended, and the regulations thereunder, the independent members of the Board of Directors (the “Board”) of Aon plc (the “Company”) have adopted this Incentive Repayment Policy (For Section 16 Officers) (this “Policy”) providing for the Company’s rec

February 16, 2024 EX-10.3

Amendment No. 1 to the Credit Agreement, dated as of February 16, 2024, by and among Aon plc, Aon Corporation, Aon Global Holdings plc, Aon Global Limited and Aon North America, Inc., Citibank, N.A., as administrative agent, and the lenders party thereto.

Execution Version AMENDMENT NO. 1 TO THE CREDIT AGREEMENT Dated as of February 16, 2024 AMENDMENT NO. 1 TO THE CREDIT AGREEMENT (this “Amendment”) among Aon Corporation, a Delaware corporation (the “Borrower Representative”), the Lenders (as defined below) party hereto and Citibank, N.A., as administrative agent (the “Administrative Agent”) for the Lenders PRELIMINARY STATEMENTS: (1) The Borrower

February 16, 2024 EX-21.1

List of Subsidiaries of Aon plc (included as Exhibit 21.1 to Annual Report on Form 10-K for the fiscal year ended December 31, 2023 filed with the SEC on February 16, 2024 and incorporated herein by reference).

Aon plc - Worldwide Subsidiaries as of December 31, 2023 Exhibit 21 Name State/Province Country Admiseg S.

February 16, 2024 EX-10.2

Term Loan Credit Agreement, dated as of February 16, 2024, by and among, Aon North America, Inc., Aon plc, Aon Corporation, Aon Global Holdings plc, Aon Global Limited, Citibank, N.A., as administrative agent, HSBC Securities (USA) Inc., JPMorgan Chase Bank, N.A., and Morgan Stanley Senior Funding, Inc. as syndication agents, and the lenders party thereto.

Execution Version TERM LOAN CREDIT AGREEMENT AMONG AON NORTH AMERICA, INC., as Borrower, AON PLC, AON CORPORATION, AON GLOBAL HOLDINGS PLC, and AON GLOBAL LIMITED, as Guarantors, THE LENDERS, CITIBANK, N.A., as Administrative Agent, HSBC SECURITIES (USA) INC., JPMORGAN CHASE BANK, N.A., and MORGAN STANLEY SENIOR FUNDING, INC., as Syndication Agents, DATED AS OF February 16, 2024, CITIBANK, N.A., H

February 13, 2024 SC 13G/A

AON / Aon plc / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 9)* Name of issuer: Aon Plc Class A Title of Class of Securities: Common Stock CUSIP Number: G0403H108 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ☒ Rul

February 9, 2024 SC 13G/A

AON / Aon plc / MASSACHUSETTS FINANCIAL SERVICES CO /MA/ - SEC SCHEDULE 13G Passive Investment

SC 13G/A 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 7 )* AON PLC (Name of Issuer) Class A Ordinary Shares (Title of Class of Securities) G0403H108 (CUSIP Number) December 29, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to

February 2, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 2, 2024 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Empl

February 2, 2024 EX-99.1

Aon Reports Fourth Quarter and Full Year 2023 Results

Investor Relations News from Aon Aon Reports Fourth Quarter and Full Year 2023 Results Fourth Quarter Key Metrics and Highlights •Total revenue increased 8% to $3.

January 25, 2024 8-K

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): January 22, 2024 Aon plc (Exact name of Registrant as specified in its charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation or Organization) Commission File Number (I.

December 20, 2023 EX-99.1

1

Exhibit 99.1 Aon to acquire NFP, a leading middle-market provider of risk, benefits, wealth and retirement plan advisory solutions • Expands Aon’s presence in large and fast-growing middle-market segment, with opportunity to enhance distribution through the firm’s Aon Business Services platform to deliver more value to clients • Brings together two cultures with a shared commitment to client excel

December 20, 2023 EX-99.2

Greg Case Chief Executive Officer Christa Davies Chief Financial Officer Eric Andersen President

Aon to Acquire NFP December 20, 2023 Exhibit 99.2 Greg Case Chief Executive Officer Christa Davies Chief Financial Officer Eric Andersen President Conference Call and Webcast Details Aon will host a conference call today, December 20, 2023 at 7:30am Central Time. Interested parties can listen to the conference call via a live audio webcast at www.aon.com, or by dialing (877) 524-8416 (Toll Free, U

December 20, 2023 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): December 19, 2023 Aon plc (Exact name of Registrant as specified in its charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation or Organization) Commission File Number (I.

December 20, 2023 EX-2.1

Agreement and Plan of Merger, by and among Aon plc, Randolph Acquisition Corp., Randolph Merger Sub LLC, NFP Intermediate Holdings A. Corp and NFP Parent Co, LLC, dated as of December 19, 2023 (incorporated by reference to Exhibit 2.1 to Aon’s Current Report on Form 8-K filed with the SEC on December 20, 2023).

Exhibit 2.1 AGREEMENT AND PLAN OF MERGER BY AND AMONG AON PLC, RANDOLPH ACQUISITION CORP., RANDOLPH MERGER SUB LLC, NFP INTERMEDIATE HOLDINGS A CORP. AND NFP PARENT CO, LLC DECEMBER 19, 2023 TABLE OF CONTENTS Page ARTICLE 1. DEFINITIONS Section 1.01 Definitions 3 Section 1.02 Interpretative Provisions 28 ARTICLE 2. DESCRIPTION OF THE TRANSACTION Section 2.01 Closing 30 Section 2.02 The Mergers; Ef

November 27, 2023 EX-99.25

EX-99.25

NOTIFICATION OF THE REMOVAL FROM LISTING AND REGISTRATION OF THE STATED SECURITIES The New York Stock Exchange hereby notifies the SEC of its intention to remove the entire class of the stated securities from listing and registration on the Exchange at the opening of business on December 08, 2023, pursuant to the provisions of Rule 12d2-2 (a).

November 20, 2023 S-8

As filed with the Securities and Exchange Commission on November 20, 2023

As filed with the Securities and Exchange Commission on November 20, 2023 No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 AON PLC (Exact name of registrant as specified in its charter) Ireland 98-1539969 (State or Other Jurisdiction of Incorporation or Organization) (I.R.S. Employer Identification No.

November 20, 2023 EX-FILING FEES

Filing Fee Table

Exhibit 107.1 Calculation of Filing Fee Tables Form S-8 (Form Type) Aon plc (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered (1) Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Equity Class A Ordinary Shares, par value $0

October 27, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2023 ☐ TRANSITION REPORT PURSUANT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 1-7933 Aon plc (Exact Name of Registrant as Specified in Its

October 27, 2023 EX-22.1

Subsidiary Guarantors and Issuers of Guaranteed Securities

Exhibit 22.1 Subsidiary Guarantors and Issuers of Guaranteed Securities The table below sets forth the respective issuers, co-issuers, and guarantors of the notes issued by Aon Global Limited, Aon Global Holdings plc, and Aon Corporation and the jurisdiction of incorporation of each such entity. Aon Corporation Aon Global Limited Aon Corporation and Aon Global Holdings plc Entity Jurisdiction of I

October 27, 2023 EX-99.1

Aon Reports Third Quarter 2023 Results

Exhibit 99.1 Investor Relations News from Aon Aon Reports Third Quarter 2023 Results Third Quarter Key Metrics •Total revenue increased 10% to $3.0 billion, including organic revenue growth of 6% •Operating margin increased 150 basis points to 23.4%, and operating margin, adjusted for certain items, increased 120 basis points to 24.3% •EPS increased 16% to $2.23, and EPS, adjusted for certain item

October 27, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 27, 2023 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Empl

October 24, 2023 EX-10.1

Credit Agreement dated as of October 19, 2023, among Aon plc, Aon Corporation, Aon Global Holdings plc, Aon Global Limited and Aon North America, Inc., Citibank, N.A., as administrative agent, and the lenders party thereto.

Exhibit 10.1 EXECUTION COPY CREDIT AGREEMENT AMONG AON PLC, AON CORPORATION, AON GLOBAL HOLDINGS PLC, and AON GLOBAL LIMITED, as Borrowers, AON NORTH AMERICA, INC., as Guarantor, THE LENDERS, CITIBANK, N.A., as Administrative Agent, MORGAN STANLEY SENIOR FUNDING, INC. and HSBC BANK USA, NATIONAL ASSOCIATION, as Syndication Agents, DATED AS OF October 19, 2023, CITIBANK, N.A., MORGAN STANLEY SENIOR

October 24, 2023 8-K

Entry into a Material Definitive Agreement

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 19, 2023 Aon plc (Exact name of registrant as specified in its charter) Ireland 1-7933 98-1539969 (State or other jurisdiction of incorporation) (Commission File Number) (IRS

October 24, 2023 EX-10.2

Amendment No. 2 to the Credit Agreement, dated as of October 19, 2023, among Aon plc, Aon Corporation, Aon Global Holdings plc, Aon Global Limited, Aon UK Limited and Aon North America, Inc., Citibank, N.A., as administrative agent and the lenders party thereto.

Exhibit 10.2 EXECUTION COPY AMENDMENT NO. 2 TO THE CREDIT AGREEMENT Dated as of October 19, 2023 AMENDMENT NO. 2 TO THE CREDIT AGREEMENT (this “Amendment”) among Aon Corporation, a Delaware corporation (the “Borrower Representative”), the Lenders (as defined below) party hereto and Citibank, N.A., as administrative agent (the “Administrative Agent”) for the Lenders PRELIMINARY STATEMENTS: (1) The

July 28, 2023 EX-10.6

Guaranty Supplement from Aon North America, Inc. to Citibank, N.A., as administrative agent, dated June 22, 2023

Exhibit 10.6 Execution Version GUARANTY SUPPLEMENT June 22, 2023 Citibank, N.A., as Administrative Agent One Penns Way, OPS II, Floor 2 New Castle, Delaware 19720 Attention: Agency Operations Credit Agreement dated as of September 28, 2021 (as amended, supplemented or otherwise modified, the “Credit Agreement”) among Aon plc, Aon Corporation, Aon UK Limited, Aon Global Holdings plc, Aon Global Lim

July 28, 2023 EX-10.8

Form of Performance Share Unit Agreement Under Aon plc 2011 Incentive Plan, as Amended and Restated (Incorporated by reference to Exhibit 10.8 to Aon plc’s Quarterly Report on Form 10-Q filed with the SEC on July 28, 2023).

Exhibit 10.8 PERFORMANCE SHARE UNIT AGREEMENT UNDER AON PLC 2011 INCENTIVE PLAN This Performance Share Unit Agreement (the “Agreement”) is entered into between Aon plc, a public limited company incorporated under Irish law (the “Company” or “Aon”) and (the “Participant”). WHEREAS, the Company maintains the Aon plc 2011 Incentive Plan, as amended from time to time (the “Plan”), which provides for t

July 28, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2023 ☐ TRANSITION REPORT PURSUANT TO S

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 1-7933 Aon plc (Exact Name of Registrant as Specified in Its Chart

July 28, 2023 EX-99.1

Aon Reports Second Quarter 2023 Results

Exhibit 99.1 Investor Relations News from Aon Aon Reports Second Quarter 2023 Results Second Quarter Key Metrics •Total revenue increased 7% to $3.2 billion, including organic revenue growth of 6% •Operating margin increased 300 basis points to 26.5%, and operating margin, adjusted for certain items, increased 110 basis points to 27.3% •EPS increased 16% to $2.71, and EPS, adjusted for certain ite

July 28, 2023 EX-10.3

Aon plc 2011 Incentive Plan, As Amended and Restated

Exhibit 10.3 AON PLC 2011 INCENTIVE PLAN (As Amended and Restated Effective April 19, 2023) SECTION 1 General SECTION 1 Purpose. Aon Corporation, a Delaware corporation (“Aon”), established the Plan to advance the interests of Aon and the Subsidiaries by providing a variety of equity-based and cash incentives designed to motivate, retain and attract employees, directors, consultants, independent c

July 28, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 28, 2023 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employe

July 28, 2023 EX-10.4

Amendment No. 1 to the Credit Agreement, dated as of May 3, 2023, by and among Citibank, N.A., as administrative agent, Aon Corporation, Aon UK Limited, Aon Global Holdings plc and Aon Global Limited, and the lenders party thereto.

Exhibit 10.4 Execution Version 1 AMENDMENT NO. 1 TO THE CREDIT AGREEMENT Dated as of May 3, 2023 AMENDMENT NO. 1 TO THE CREDIT AGREEMENT (this “Amendment”) by Citibank, N.A., as administrative agent (the “Administrative Agent”). PRELIMINARY STATEMENTS: (1) Aon plc, a public limited company organized under the laws of Ireland (the “Parent”), Aon Corporation, a Delaware corporation (“Aon Corporation

July 28, 2023 EX-22.1

Subsidiary Guarantors and Issuers of Guaranteed Securities

Exhibit 22.1 Subsidiary Guarantors and Issuers of Guaranteed Securities The table below sets forth the respective issuers, co-issuers, and guarantors of the notes issued by Aon Global Limited, Aon Global Holdings plc, and Aon Corporation and the jurisdiction of incorporation of each such entity. Aon Corporation Aon Global Limited Aon Corporation and Aon Global Holdings plc Entity Jurisdiction of I

July 28, 2023 EX-10.5

Guaranty Supplement from Aon North America, Inc. to Citibank, N.A., as administrative agent, dated June 22, 2023

Exhibit 10.5 Execution Version GUARANTY SUPPLEMENT June 22, 2023 Citibank, N.A., as Administrative Agent One Penns Way, OPS II, Floor 2 New Castle, Delaware 19720 Attention: Agency Operations RE: Credit Agreement dated as of October 19, 2017 (as amended, supplemented or otherwise modified, the “Credit Agreement”) among Aon plc, Aon Corporation, the other Loan Parties party to the Credit Agreement,

July 28, 2023 EX-10.7

Employment Agreement, effective as of July 1, 2023, between Aon Corporation and Eric Andersen.

Exhibit 10.7 EMPLOYMENT AGREEMENT This Employment Agreement (this “Agreement”) is effective as of July 1, 2023 between Aon Corporation (the “Company”), and Eric Andersen (the “Executive”). WHEREAS, the Executive currently is President of the Company and Aon plc, and an at-will employee; WHEREAS, the Company desires to continue to employ the Executive, and the Executive is willing to continue to be

June 22, 2023 EX-4.4

Amended and Restated Certificate of Incorporation of Aon Corporation

Exhibit 4.4 AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF AON CORPORATION The present name of the corporation is Aon Corporation which was incorporated on December 12, 1979 under the name of Combined International Corporation. FIRST: The name of the corporation is Aon Corporation (the “Corporation”). SECOND: The address of the registered office of the Corporation in the State of Delaware is

June 22, 2023 EX-FILING FEES

Filing Fee Table

EX-FILING FEES Exhibit 107 CALCULATION OF FILING FEE TABLES FORM S-3 (Form Type) AON PLC AON GLOBAL LIMITED AON GLOBAL HOLDINGS PLC AON CORPORATION AON NORTH AMERICA, INC.

June 22, 2023 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registr

8-A12B UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registrant as Specified in Its Charter) (Exact Name of Registrant as Specified in Its Charter) Ireland England and Wales (Jurisdiction of Incorporation or Organization) (Jurisdiction of Incorporation or Organization) 98-1539969 98-1030901 (I.

June 22, 2023 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registr

8-A12B UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registrant as Specified in Its Charter) (Exact Name of Registrant as Specified in Its Charter) Ireland England and Wales (Jurisdiction of Incorporation or Organization) (Jurisdiction of Incorporation or Organization) 98-1539969 98-1030901 (I.

June 22, 2023 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registr

8-A12B UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registrant as Specified in Its Charter) (Exact Name of Registrant as Specified in Its Charter) Ireland England and Wales (Jurisdiction of Incorporation or Organization) (Jurisdiction of Incorporation or Organization) 98-1539969 98-1030901 (I.

June 22, 2023 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registr

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registrant as Specified in Its Charter) (Exact Name of Registrant as Specified in Its Charter) Ireland England and Wales (Jurisdiction of Incorporation or Organization) (Jurisdiction of Incorporation or Organization) 98-1539969 98-1030901 (I.

June 22, 2023 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registr

8-A12B UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registrant as Specified in Its Charter) (Exact Name of Registrant as Specified in Its Charter) Ireland England and Wales (Jurisdiction of Incorporation or Organization) (Jurisdiction of Incorporation or Organization) 98-1539969 98-1030901 (I.

June 22, 2023 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registr

8-A12B UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registrant as Specified in Its Charter) (Exact Name of Registrant as Specified in Its Charter) Ireland England and Wales (Jurisdiction of Incorporation or Organization) (Jurisdiction of Incorporation or Organization) 98-1539969 98-1030901 (I.

June 22, 2023 EX-25.1

Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939 of The Bank of New York Mellon Trust Company, N.A. for the 2010 Aon Corporation Indenture

EX-25.1 Exhibit 25.1 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ☐ CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. (Exact name of trustee as specified in its char

June 22, 2023 EX-25.5

Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939 of The Bank of New York Mellon Trust Company, N.A. for the Form of ANA Indenture

EX-25.5 Exhibit 25.5 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ☐ CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. (Exact name of trustee as specified in its char

June 22, 2023 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registr

8-A12B UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registrant as Specified in Its Charter) (Exact Name of Registrant as Specified in Its Charter) Ireland England and Wales (Jurisdiction of Incorporation or Organization) (Jurisdiction of Incorporation or Organization) 98-1539969 98-1030901 (I.

June 22, 2023 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registr

8-A12B UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registrant as Specified in Its Charter) (Exact Name of Registrant as Specified in Its Charter) Ireland England and Wales (Jurisdiction of Incorporation or Organization) (Jurisdiction of Incorporation or Organization) 98-1539969 98-1030901 (I.

June 22, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 22, 2023 Aon plc (Exact Name

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 22, 2023 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employe

June 22, 2023 EX-10.2

Amendment to International Assignment Letter, dated June 16, 2023, between Aon Corporation and Greg Case.

EX-10.2 Exhibit 10.2 Gregory Case Aon Corporation United States June 16, 2023 International Assignment: 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 London, England (your “International Assignment Letter”). Pursuant to this letter

June 22, 2023 S-3ASR

Powers of Attorney for Aon plc, Aon Global Limited, Aon Global Holdings plc, Aon Corporation and Aon North America, Inc. (included in the signature pages hereto)

S-3ASR Table of Contents As filed with the Securities and Exchange Commission on June 22, 2023 Registration No.

June 22, 2023 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registr

8-A12B UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registrant as Specified in Its Charter) (Exact Name of Registrant as Specified in Its Charter) Ireland England and Wales (Jurisdiction of Incorporation or Organization) (Jurisdiction of Incorporation or Organization) 98-1539969 98-1030901 (I.

June 22, 2023 EX-25.3

Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939 of The Bank of New York Mellon Trust Company, N.A. for the Form of Aon Corporation Indenture

Exhibit 25.3 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ☐ CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. (Exact name of trustee as specified in its charter) 95-

June 22, 2023 EX-25.4

Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939 of The Bank of New York Mellon Trust Company, N.A. for the Form of AGH Indenture

EX-25.4 Exhibit 25.4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ☐ CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. (Exact name of trustee as specified in its char

June 22, 2023 EX-4.16

First Indenture Supplement, dated June 22, 2023, among Aon Corporation, Aon plc, Aon Global Limited, Aon Global Holdings plc, Aon North America, Inc. and The Bank of New York Mellon Trust Company, N.A. — incorporated by reference to Exhibit 4.16 to Aon’s Registration Statement on Form S 3 filed June 22, 2023.

EX-4.16 Exhibit 4.16 AON CORPORATION Company AON PLC AON GLOBAL LIMITED AON GLOBAL HOLDINGS PLC AON NORTH AMERICA, INC. Guarantors and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. Trustee FIRST INDENTURE SUPPLEMENT DATED AS OF JUNE 22, 2023 TO THE SECOND AMENDED AND RESTATED INDENTURE DATED AS OF APRIL 1, 2020 AMONG AON CORPORATION, AON PLC, AON GLOBAL LIMITED, AON GLOBAL HOLDINGS PLC AND THE B

June 22, 2023 EX-4.22

First Indenture Supplement, dated June 22, 2023, among Aon plc, Aon Corporation, Aon Global Limited, Aon Global Holdings plc, Aon North America, Inc. and The Bank of New York Mellon Trust Company, N.A.

EX-4.22 Exhibit 4.22 AON GLOBAL LIMITED Company AON GLOBAL HOLDINGS PLC AON PLC AON CORPORATION AON NORTH AMERICA, INC. Guarantors and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. Trustee FIRST INDENTURE SUPPLEMENT DATED AS OF JUNE 22, 2023 TO THE AMENDED AND RESTATED INDENTURE DATED AS OF APRIL 1, 2020 AMONG AON GLOBAL LIMITED (FORMERLY AON PLC), AON GLOBAL HOLDINGS PLC, AON PLC, AON CORPORATI

June 22, 2023 EX-4.7

Certificate of Incorporation of Aon North America, Inc.

Exhibit 4.7 CERTIFICATE OF INCORPORATION OF Hogg Robinson North America, Inc. FIRST: The name of the Corporation is Hogg Robinson North America, Inc. SECOND: The address of its registered office in the State of Delaware is 410 South State Street, in the City of Dover, County of Kent. The name of its registered agent at such address is United Corporate Services, Inc. THIRD: The nature of the busine

June 22, 2023 EX-4.9

Certificate of Amendment of Certificate of Incorporation, filed November 5, 2021, of Aon North America, Inc.

Exhibit 4.9 CERTIFICATE OF AMENDMENT OF CERTIFICATE OF INCORPORATION OF HOGG ROBINSON NORTH AMERICA, INC. It is hereby certified that: 1. The name of the corporation (hereinafter called the “corporation”) is: Hogg Robinson North America, Inc. 2. The certificate of incorporation of the corporation is hereby amended by striking out Article First thereof and by substituting in lieu of said Article th

June 22, 2023 EX-99.1

Guarantee of Registered Securities

Exhibit 99.1 Guarantee of Registered Securities On June 22, 2023, Aon North America, Inc., a 100% indirectly owned subsidiary of Aon plc, entered into agreements pursuant to which it guaranteed the obligations of Aon Corporation, Aon Global Limited and Aon Global Holdings plc arising under issued and outstanding debt securities, which are outlined in the tables below by the respective issuer or co

June 22, 2023 EX-4.18

First Indenture Supplement, dated June 22, 2023, among Aon plc, Aon Corporation, Aon Global Limited, Aon Global Holdings plc, Aon North America, Inc. and The Bank of New York Mellon Trust Company, N.A. — incorporated by reference to Exhibit 4.18 to Aon’s Registration Statement on Form S 3 filed June 22, 2023.

EX-4.18 Exhibit 4.18 AON GLOBAL LIMITED Company AON GLOBAL HOLDINGS PLC AON PLC AON CORPORATION AON NORTH AMERICA, INC. Guarantors and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. Trustee FIRST INDENTURE SUPPLEMENT DATED AS OF JUNE 22, 2023 TO THE AMENDED AND RESTATED INDENTURE DATED AS OF APRIL 1, 2020 AMONG AON GLOBAL LIMITED (FORMERLY AON PLC), AON PLC, AON CORPORATION, AON GLOBAL HOLDINGS P

June 22, 2023 EX-4.14

First Indenture Supplement, dated June 22, 2023, among Aon Corporation, Aon plc, Aon Global Limited, Aon Global Holdings plc, Aon North America, Inc. and The Bank of New York Mellon Trust Company, N.A. — incorporated by reference to Exhibit 4.14 to Aon’s Registration Statement on Form S 3 filed June 22, 2023.

Exhibit 4.14 AON CORPORATION Company AON PLC AON GLOBAL LIMITED AON GLOBAL HOLDINGS PLC AON NORTH AMERICA, INC. Guarantors and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. Trustee FIRST INDENTURE SUPPLEMENT DATED AS OF JUNE 22, 2023 TO THE SECOND AMENDED AND RESTATED INDENTURE DATED AS OF APRIL 1, 2020 AMONG AON CORPORATION, AON PLC, AON GLOBAL LIMITED, AON GLOBAL HOLDINGS PLC AND THE BANK OF N

June 22, 2023 EX-4.11

Bylaws of Aon North America, Inc.

Exhibit 4.11 BYLAWS OF Aon North America, Inc. Adopted on September 3, 2013 ARTICLE I - STOCKHOLDERS’ MEETINGS Section 1. ANNUAL MEETING: The annual meeting of the stockholders shall be held at the corporate headquarters of the Company in city of Chicago in the State of Illinois on or before the last business day of the anniversary month of the date of incorporation of each year, beginning in the

June 22, 2023 EX-10.1

Amendment to International Assignment Letter, dated June 16, 2023, between Aon Corporation and Christa Davies.

EX-10.1 Exhibit 10.1 Christa Davies Aon Corporation United States June 16, 2023 International Assignment: Chicago, Illinois to London, England Dear Christa, This letter serves to amend your international assignment letter effective July 1, 2016 governing the terms of your international assignment from Chicago, Illinois to London, England (your “International Assignment Letter”). Pursuant to this l

June 22, 2023 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registr

8-A12B UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registrant as Specified in Its Charter) (Exact Name of Registrant as Specified in Its Charter) Ireland England and Wales (Jurisdiction of Incorporation or Organization) (Jurisdiction of Incorporation or Organization) 98-1539969 98-1030901 (I.

June 22, 2023 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registr

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registrant as Specified in Its Charter) (Exact Name of Registrant as Specified in Its Charter) Ireland England and Wales (Jurisdiction of Incorporation or Organization) (Jurisdiction of Incorporation or Organization) 98-1539969 98-1030901 (I.

June 22, 2023 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registr

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registrant as Specified in Its Charter) (Exact Name of Registrant as Specified in Its Charter) Ireland England and Wales (Jurisdiction of Incorporation or Organization) (Jurisdiction of Incorporation or Organization) 98-1539969 98-1030901 (I.

June 22, 2023 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registr

8-A12B UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registrant as Specified in Its Charter) (Exact Name of Registrant as Specified in Its Charter) Ireland England and Wales (Jurisdiction of Incorporation or Organization) (Jurisdiction of Incorporation or Organization) 98-1539969 98-1030901 (I.

June 22, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 16, 2023 Aon plc (Exact name

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 16, 2023 Aon plc (Exact name of registrant as specified in its charter) Ireland 1-7933 98-1539969 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Emp

June 22, 2023 EX-10.3

Aon plc 2011 Incentive Plan, As Amended and Restated.

EX-10.3 Exhibit 10.3 AON PLC 2011 INCENTIVE PLAN (As Amended and Restated Effective April 19, 2023) SECTION 1 General 1.1. Purpose. Aon Corporation, a Delaware corporation (“Aon”), established the Plan to advance the interests of Aon and the Subsidiaries by providing a variety of equity-based and cash incentives designed to motivate, retain and attract employees, directors, consultants, independen

June 22, 2023 EX-4.5

Certificate of Amendment of Certificate of Incorporation, filed October 25, 2021, of Aon Corporation

Exhibit 4.5 STATE OF DELAWARE CERTIFICATE OF AMENDMENT OF CERTIFICATE OF INCORPORATION The corporation organized and existing under and by virtue of the General Corporation Law of the State of Delaware does hereby certify: FIRST: That by unanimous action by written consent of the Board of Directors Aon Corporation resolutions were duly adopted setting forth a proposed amendment of the Certificate

June 22, 2023 EX-4.32

Form of Indenture, among Aon North America, Inc., Aon plc, Aon Global Limited, Aon Global Holdings plc, Aon Corporation and The Bank of New York Mellon Trust Company, N.A. (the “Form of ANA Indenture”)

EX-4.32 Exhibit 4.32 AON NORTH AMERICA, INC. Company the Co-Issuer(s) party hereto the Guarantors party hereto and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. Trustee INDENTURE Dated as of [DATE] Debt Securities CROSS-REFERENCE SHEET* BETWEEN Provisions of Sections 310 through 318(a) of the Trust Indenture Act of 1939 and the within Indenture among Aon North America, Inc., the Co-Issuers party

June 22, 2023 EX-4.31

Form of Indenture, among Aon Global Holdings plc, Aon plc, Aon Global Limited, Aon Corporation, Aon North America, Inc. and The Bank of New York Mellon Trust Company, N.A. (the “Form of AGH Indenture”)

EX-4.31 Exhibit 4.31 AON GLOBAL HOLDINGS PLC Company the Co-Issuer(s) party hereto the Guarantors party hereto and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. Trustee INDENTURE Dated as of [DATE] Debt Securities CROSS-REFERENCE SHEET* BETWEEN Provisions of Sections 310 through 318(a) of the Trust Indenture Act of 1939 and the within Indenture among Aon Global Holdings plc, the Co-Issuers party

June 22, 2023 EX-25.2

Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939 of The Bank of New York Mellon Trust Company, N.A. for the 2018 Aon Corporation Indenture

EX-25.2 Exhibit 25.2 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ☐ CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. (Exact name of trustee as specified in its char

June 22, 2023 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registr

8-A12B UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registrant as Specified in Its Charter) (Exact Name of Registrant as Specified in Its Charter) Ireland England and Wales (Jurisdiction of Incorporation or Organization) (Jurisdiction of Incorporation or Organization) 98-1539969 98-1030901 (I.

June 22, 2023 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registr

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registrant as Specified in Its Charter) (Exact Name of Registrant as Specified in Its Charter) Ireland England and Wales (Jurisdiction of Incorporation or Organization) (Jurisdiction of Incorporation or Organization) 98-1539969 98-1030901 (I.

June 22, 2023 EX-4.20

First Indenture Supplement, dated June 22, 2023, among Aon plc, Aon Corporation, Aon Global Limited, Aon Global Holdings plc, Aon North America, Inc. and The Bank of New York Mellon Trust Company, N.A. — incorporated by reference to Exhibit 4.20 to Aon’s Registration Statement on Form S 3 filed June 22, 2023.

EX-4.20 Exhibit 4.20 AON GLOBAL LIMITED Company AON GLOBAL HOLDINGS PLC AON PLC AON CORPORATION AON NORTH AMERICA, INC. Guarantors and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. Trustee FIRST INDENTURE SUPPLEMENT DATED AS OF JUNE 22, 2023 TO THE SECOND AMENDED AND RESTATED INDENTURE DATED AS OF APRIL 1, 2020 AMONG AON GLOBAL LIMITED (FORMERLY AON PLC), AON GLOBAL HOLDINGS PLC, AON PLC, AON CO

June 22, 2023 EX-4.29

Sixth Indenture Supplement, dated June 22, 2023, among Aon Corporation, Aon plc, Aon Global Limited, Aon Global Holdings plc, Aon North America, Inc. and The Bank of New York Mellon Trust Company, N.A. — incorporated by reference to Exhibit 4.29 to Aon’s Registration Statement on Form S 3 filed June 22, 2023.

Exhibit 4.29 AON CORPORATION Company AON GLOBAL HOLDINGS PLC Co-Issuer or Guarantor AON PLC AON GLOBAL LIMITED AON NORTH AMERICA, INC. Guarantors and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. Trustee SIXTH INDENTURE SUPPLEMENT DATED AS OF JUNE 22, 2023 TO THE AMENDED AND RESTATED INDENTURE DATED AS OF APRIL 1, 2020 AMONG AON CORPORATION, AON GLOBAL HOLDINGS PLC, AON PLC, AON GLOBAL LIMITED,

June 22, 2023 EX-4.8

Certificate of Amendment of the Certificate of Incorporation, filed March 9, 1995, of Aon North America, Inc.

EX-4.8 Exhibit 4.8 CERTIFICATE OF AMENDMENT OF THE CERTIFICATE INCORPORATION OF HOGG ROBINSON NORTH AMERICA, INC. Pursuant to Section 242 of the General Corporation Law of the State of Delaware Hogg Robinson North America, Inc., a Delaware corporation (hereinafter called the “Corporation”), does hereby certify as follows: FIRST: Article TENTH of the Corporation’s Certificate of Incorporation is he

June 22, 2023 EX-5.3

Consent of Freshfields Bruckhaus Deringer LLP (included in Exhibit 5.3)

EX-5.3 Exhibit 5.3 Execution Version Aon Global Holdings plc The Aon Centre The Leadenhall Building 122 Leadenhall Street London, EC3V 4AN Aon Global Limited The Aon Centre The Leadenhall Building 122 Leadenhall Street London, EC3V 4AN London Freshfields Bruckhaus Deringer LLP 100 Bishopsgate London EC2P 2SR T +44 20 7936 4000 (Switchboard) +44 20 7832 7022 (Direct) F +44 20 7108 7022 LDE No 23 E

June 22, 2023 EX-4.30

Form of Second Amended and Restated Indenture, among Aon Corporation, Aon plc, Aon Global Limited, Aon Global Holdings plc, Aon North America, Inc. and The Bank of New York Mellon Trust Company, N.A. (amending and restating the Amended and Restated Indenture, dated April 1, 2020, amending and restating the Indenture, dated December 3, 2018) (the “Form of Aon Corporation Indenture”)

EX-4.30 Exhibit 4.30 AON CORPORATION Company the Co-Issuer(s) party hereto the Guarantors party hereto and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. Trustee AMENDED AND RESTATED INDENTURE (Supplemental Indenture Amending and Restating the Amended and Restated Indenture dated as of April 1, 2020) Dated as of [DATE] Debt Securities CROSS-REFERENCE SHEET* BETWEEN Provisions of Sections 310 thro

June 22, 2023 EX-4.2

Articles of Association of Aon Global Limited

Exhibit 4.2 THE COMPANIES ACT 2006 PRIVATE COMPANY LIMITED BY SHARES ARTICLES OF ASSOCIATION OF Aon Global Limited (Company No. 07876075) PART 1 - PRELIMINARY 1. Articles of association These articles constitute the articles of association of the company. No regulations contained in any statute or subordinate legislation, including the regulations contained in Schedule 1 to The Companies (Model Ar

June 22, 2023 EX-4.10

Certificate of Amendment of Certificate of Incorporation, filed March 17, 2022, of Aon North America, Inc.

Exhibit 4.10 STATE OF DELAWARE CERTIFICATE OF AMENDMENT OF CERTIFICATE OF INCORPORATION The corporation organized and existing under and by virtue of the General Corporation Law of the State of Delaware does hereby certify: FIRST: That by unanimous action by written consent of the Board of Directors of Aon North America, Inc. resolutions were duly adopted setting forth a proposed amendment of the

June 22, 2023 EX-22.1

Subsidiary Guarantors and Issuers of Guaranteed Securities

EX-22.1 Exhibit 22.1 Subsidiary Guarantors and Issuers of Guaranteed Securities The table below sets forth the respective issuers, co-issuers and guarantors of the notes issued by Aon Global Limited, Aon Global Holdings plc and Aon Corporation and the jurisdiction of incorporation of each such entity. Aon Corporation Aon Global Limited Aon Corporation and Aon Global Holdings plc Entity Jurisdictio

April 28, 2023 DEF 14A

Schedule 14A

Table of Contents SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO.

April 28, 2023 EX-10.1

Form of Restricted Stock Unit Agreement

2023 ISP Award Agreement Template RESTRICTED STOCK UNIT AGREEMENT UNDER AMENDED AND RESTATED AON PLC 2011 INCENTIVE PLAN This Restricted Stock Unit Agreement, including Appendices A and B attached hereto (the “Agreement”), is entered into between Aon plc, a public limited company incorporated under Irish law (the “Company” or “Aon”) and (the “Participant”).

April 28, 2023 EX-22.1

Subsidiary Guarantors and Issuers of Guaranteed Securities

Exhibit 22.1 Subsidiary Guarantors and Issuers of Guaranteed Securities The table below sets forth the respective issuers, co-issuers, and guarantors of the notes issued by Aon Global Limited, Aon Global Holdings plc, and Aon Corporation and the jurisdiction of incorporation of each such entity. Aon Corporation Aon Global Limited Aon Corporation and Aon Global Holdings plc Entity Jurisdiction of I

April 28, 2023 10-Q

Form 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 1-7933 Aon plc (Exact Name of Registrant as Specified in Its Char

April 28, 2023 DEFA14A

SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO. )

DEFA14A SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO.

April 28, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 28, 2023 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employ

April 28, 2023 EX-99.1

Aon Reports First Quarter 2023 Results

Exhibit 99.1 Investor Relations News from Aon Aon Reports First Quarter 2023 Results First Quarter Key Metrics •Total revenue increased 5% to $3.9 billion, including organic revenue growth of 7% •Operating margin increased 90 basis points to 38.1%, and operating margin, adjusted for certain items, increased 70 basis points to 38.7% •EPS increased 7% to $5.07, and EPS, adjusted for certain items, i

April 12, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 7, 2023 Aon plc (Exact name

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 7, 2023 Aon plc (Exact name of registrant as specified in its charter) Ireland 1-7933 98-1539969 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Emp

February 28, 2023 EX-4.2

Form of 5.350% Senior Notes due 2033 (included in Exhibit 4.2 to the Current Report on Form 8 K filed by Aon on February 28, 2023) — incorporated by reference to Exhibit 4.3 to Aon’s Current Report on Form 8 K filed February 28, 2023.

Exhibit 4.2 AON CORPORATION AON GLOBAL HOLDINGS PLC FIFTH INDENTURE SUPPLEMENT DATED AS OF FEBRUARY 28, 2023 TO THE AMENDED AND RESTATED INDENTURE DATED AS OF APRIL 1, 2020 THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. TRUSTEE DEBT SECURITIES THIS FIFTH INDENTURE SUPPLEMENT (the “Fifth Indenture Supplement”), is dated as of February 28, 2023, among Aon Corporation, a corporation duly organized a

February 28, 2023 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc (Exact Name of Registrant as Specified in

8-A12B UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc (Exact Name of Registrant as Specified in Its Charter) Aon Global Limited (Exact Name of Registrant as Specified in Its Charter) Ireland (Jurisdiction of Incorporation or Organization) England and Wales (Jurisdiction of Incorporation or Organization) 98-1539969 (I.

February 28, 2023 EX-1.1

Underwriting Agreement, dated February 23, 2023, among Aon Corporation, AGH, Aon plc and AGL, and Morgan Stanley & Co. LLC, BofA Securities, Inc. and HSBC Securities (USA) Inc. as representatives of the several underwriters named therein.

EX-1.1 2 d474704dex11.htm EX-1.1 Exhibit 1.1 Aon Corporation Aon Global Holdings plc Aon plc Aon Global Limited $750,000,000 5.350% Senior Notes due 2033 UNDERWRITING AGREEMENT February 23, 2023 Morgan Stanley & Co. LLC BofA Securities, Inc. HSBC Securities (USA) Inc. As Representatives (the “Representatives”) of the several Underwriters listed in Exhibit A hereto c/o Morgan Stanley & Co. LLC 1585

February 28, 2023 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 23, 2023 Aon plc (Exact name of registrant as specified in its charter) Ireland 1-7933 95-1539969 (State or other jurisdiction of incorporation) (Commission File Number) (IRS

February 28, 2023 EX-5.3

Consent of Matheson (included in Exhibit 5.3).

EX-5.3 Exhibit 5.3 Aon plc Metropolitan Building James Joyce Street Dublin 1 Ireland Our ref 28 February 2023 FBO/SCC 659500-37 Dear Sirs Registration, offer and sale of $750,000,000, 5.350% Senior Notes due 2033 by Aon Corporation and Aon Global Holdings plc, as guaranteed by Aon plc and Aon Global Limited We have acted as Irish counsel to Aon plc, a public limited company incorporated under the

February 24, 2023 424B5

Aon Corporation Aon Global Holdings plc $750,000,000 5.350% Senior Notes due 2033 with full and unconditional guarantees as to payment of principal and interest by Aon plc and Aon Global Limited

424B5 Table of Contents Filed Pursuant to Rule 424(b)(5) Registration Statement Nos.

February 24, 2023 EX-FILING FEES

Calculation of Filing Fee Tables (Form Type) Aon plc (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registe

EX-FILING FEES Exhibit 107 Calculation of Filing Fee Tables 424(b)(5) (Form Type) Aon plc (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid In Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to Be Paid Debt 5.

February 23, 2023 424B5

Subject to completion, dated February 23, 2023

424B5 Table of Contents Filed Pursuant to Rule 424(b)(5) Registration Statement Nos.

February 23, 2023 FWP

Aon Corporation and Aon Global Holdings plc $750,000,000 5.350% SENIOR NOTES DUE 2033 (the “Notes”) PRICING TERM SHEET Terms Applicable to the Notes Issuers: Aon Corporation and Aon Global Holdings plc Guarantors: Aon plc and Aon Global Limited Offer

FWP Filed pursuant to Rule 433 Relating to Preliminary Prospectus Supplement dated February 23, 2023 to Prospectus dated May 12, 2020 Registration Statement Nos.

February 17, 2023 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2022 OR ☐ TRANSITION REPORT PUR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number: 1-7933 Aon plc (Exact name of registrant as specified in i

February 17, 2023 EX-10.7

Seventh Amendment to the Aon Supplemental Savings Plan, effective June 30, 2022 – incorporated by reference to Exhibit 10.71 to Aon’s Annual Report on Form 10-K for the year ended December 31, 2023.

EXECUTION VERSION SEVENTH AMENDMENT TO THE AON SUPPLEMENTAL SAVINGS PLAN (As amended and restated effective January 1, 2017) This Seventh Amendment to the Aon Supplemental Savings Plan, as amended and restated as of January 1, 2017 (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.

February 17, 2023 EX-10.6

Sixth Amendment to the Amended and Restated Aon Deferred Compensation Plan, effective June 30, 2022 – incorporated by reference to Exhibit 10.61 to Aon’s Annual Report on Form 10-K for the year ended December 31, 2023.

EX-10.6 3 exhibit10612022.htm EX-10.6 EXECUTION VERSION AMENDMENT TO THE AON DEFERRED COMPENSATION PLAN This Sixth 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. RE

February 17, 2023 EX-4.25

Exhibit 4.25

EX-4.25 2 exhibit4252022.htm EX-4.25 Exhibit 4.25 Description of the Share Capital of Aon Ireland Set forth below is a summary of the material terms of the share capital of Aon plc, an Irish public limited company ("Aon Ireland"). The summary is subject to the Companies Act 2014 of Ireland, as amended (the "Irish Companies Act"), and is qualified in its entirety by reference to the Aon Ireland Con

February 17, 2023 EX-21.1

List of Subsidiaries of Aon.

Aon plc - Worldwide Subsidiaries as of December 31, 2022 Exhibit 21 Name Country State/Province Admiseg S.

February 17, 2023 EX-22.1

Subsidiary Guarantors and Issuers of Guaranteed Securities

Exhibit 22.1 Subsidiary Guarantors and Issuers of Guaranteed Securities The table below sets forth the respective issuers, co-issuers, and guarantors of the notes issued by Aon Global Limited, Aon Global Holdings plc, and Aon Corporation and the jurisdiction of incorporation of each such entity. Aon Corporation Aon Global Limited Aon Corporation and Aon Global Holdings plc Entity Jurisdiction of I

February 9, 2023 SC 13G/A

AON / Aon PLC / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv0274-aonplcclassa.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 8)* Name of issuer: Aon plc Class A Title of Class of Securities: Common Stock CUSIP Number: G0403H108 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate box to designate the ru

February 8, 2023 SC 13G/A

AON / Aon PLC / MASSACHUSETTS FINANCIAL SERVICES CO /MA/ - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 6 )* AON PLC (Name of Issuer) Class A Ordinary Shares (Title of Class of Securities) G0403H108 (CUSIP Number) December 30, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Sch

February 3, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 3, 2023 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Empl

February 3, 2023 EX-99.1

Aon Reports Fourth Quarter and Full Year 2022 Results

Investor Relations News from Aon Aon Reports Fourth Quarter and Full Year 2022 Results Fourth Quarter Key Metrics and Highlights •Total revenue increased 2% to $3.

January 10, 2023 CORRESP

1

CORRESP 1 filename1.htm Aon plc The Metropolitan Building James Joyce Street Dublin 1, Ireland D01 K0Y8 January 10, 2023 VIA EDGAR Ms. Cara Lubit and Mr. Robert Klein Division of Corporation Finance, Office of Finance U.S. Securities and Exchange Commission 100 F Street, N.E. Washington, D.C. 20549 Re: Aon plc Form 10-K for the Fiscal Year Ended December 31, 2021 Filed February 18, 2022 Form 10-Q

October 28, 2022 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 28, 2022 Aon plc (Exact N

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 28, 2022 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Empl

October 28, 2022 EX-22.1

Subsidiary Guarantors and Issuers of Guaranteed Securities

Exhibit 22.1 Subsidiary Guarantors and Issuers of Guaranteed Securities The table below sets forth the respective issuers, co-issuers, and guarantors of the notes issued by Aon Global Limited, Aon Global Holdings plc, and Aon Corporation and the jurisdiction of incorporation of each such entity. Aon Corporation Aon Global Limited Aon Corporation and Aon Global Holdings plc Entity Jurisdiction of I

October 28, 2022 EX-99.1

Aon Reports Third Quarter 2022 Results

Exhibit 99.1 Investor Relations News from Aon Aon Reports Third Quarter 2022 Results Third Quarter Key Metrics •Total revenue was flat at $2.7 billion, including organic revenue growth of 5% •Operating margin increased 5,150 basis points to 21.9%, and operating margin, adjusted for certain items, increased 100 basis points to 23.1% •EPS increased 148% to $1.92, and EPS, adjusted for certain items,

October 28, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2022 ☐ TRANSITION REPORT PURSUANT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 1-7933 Aon plc (Exact Name of Registrant as Specified in Its

October 21, 2022 EX-10.1

Amendment No. 3 to the 2017 Credit Agreement, dated October 19, 2022, among Aon plc, Aon Corporation, Aon Global Holdings plc, Aon Global limited, Citibank, N.A., as administrative agent, and the lenders party thereto – incorporated by reference to Exhibit 10.1 to Aon’s Current Report on Form 8 K filed on October 21, 2022.

Exhibit 10.1 EXECUTION COPY AMENDMENT NO. 3 TO THE CREDIT AGREEMENT Dated as of October 19, 2022 AMENDMENT NO. 3 TO THE CREDIT AGREEMENT (this ?Amendment?) among Aon plc, a public limited company organized under the laws of Ireland (the ?Parent?), Aon Corporation, a Delaware corporation (?Aon Corporation?), Aon Global Holdings plc, a public limited company organized under the laws of England and W

October 21, 2022 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 19, 2022 Aon plc (Exact name of registrant as specified in its charter) Ireland 1-7933 98-1539969 (State or other jurisdiction of incorporation) (Commission File Number) (IRS

September 22, 2022 8-K

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 21, 2022 Aon plc (Exact name of registrant as specified in its charter) Ireland 1-7933 98-1539969 (State or other jurisdiction of incorporation) (Commission File Number) (IR

September 12, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 7, 2022 Aon plc (Exact name of registrant as specified in its charter) Ireland 1-7933 95-1539969 (State or other jurisdiction of incorporation) (Commission File Number) (IRS

September 12, 2022 EX-5.3

Consent of Matheson (included in Exhibit 5.3).

Exhibit 5.3 Aon plc Metropolitan Building James Joyce Street Dublin 1 Ireland Our ref 12 September 2022 FBO/SCC 659500-33 Dear Sirs Registration, offer and sale of $500,000,000, 5.000% Senior Notes due 2032 by Aon Corporation and Aon Global Holdings plc, as guaranteed by Aon plc and Aon Global Limited We have acted as Irish counsel to Aon plc, a public limited company incorporated under the laws o

September 12, 2022 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc (Exact Name of Registrant as Specified in

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc (Exact Name of Registrant as Specified in Its Charter) Aon Global Limited (Exact Name of Registrant as Specified in Its Charter) Ireland (Jurisdiction of Incorporation or Organization) England and Wales (Jurisdiction of Incorporation or Organization) 98-1539969 (I.

September 12, 2022 EX-1.1

Underwriting Agreement, dated September 7, 2022, among Aon Corporation, AGH, Aon plc and AGL, and Citigroup Global Markets Inc. and J.P. Morgan Securities LLC as representatives of the several underwriters named therein.

Exhibit 1.1 Execution Version Aon Corporation Aon Global Holdings plc Aon plc Aon Global Limited $500,000,000 5.000% Senior Notes due 2032 UNDERWRITING AGREEMENT September 7, 2022 Citigroup Global Markets Inc. J.P. Morgan Securities LLC As Representatives (the ?Representatives?) of the several Underwriters listed in Exhibit A hereto c/o Citigroup Global Markets Inc. 388 Greenwich Street New York,

September 12, 2022 EX-4.2

Fourth Indenture Supplement, dated September 12, 2022, among Aon Corporation, Aon Global Holdings plc, Aon Global Limited, Aon plc and The Bank of New York Mellon Trust Company, N.A., as trustee – incorporated by reference to Exhibit 4.2 to Aon’ Current Report on Form 8-K filed September 12, 2022.

Exhibit 4.2 AON CORPORATION AON GLOBAL HOLDINGS PLC FOURTH INDENTURE SUPPLEMENT DATED AS OF SEPTEMBER 12, 2022 TO THE AMENDED AND RESTATED INDENTURE DATED AS OF APRIL 1, 2020 THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. TRUSTEE DEBT SECURITIES THIS FOURTH INDENTURE SUPPLEMENT (the ?Fourth Indenture Supplement?), is dated as of September 12, 2022, among Aon Corporation, a corporation duly organi

September 8, 2022 424B5

Aon Corporation Aon Global Holdings plc $500,000,000 5.000% Senior Notes due 2032 with full and unconditional guarantees as to payment of principal and interest by Aon plc and Aon Global Limited

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration Statement Nos. 333-238189, 333-238189-01, 333-238189-02 and 333-238189-03 Prospectus Supplement (To Prospectus dated May 12, 2020) Aon Corporation Aon Global Holdings plc $500,000,000 5.000% Senior Notes due 2032 with full and unconditional guarantees as to payment of principal and interest by Aon plc and Aon Global Limited Aon Corpor

September 8, 2022 EX-FILING FEES

Calculation of Filing Fee Tables (Form Type) Aon plc (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registe

Exhibit 107 Calculation of Filing Fee Tables 424(b)(5) (Form Type) Aon plc (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid In Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to Be Paid Debt 5.

September 7, 2022 FWP

Aon Corporation and Aon Global Holdings plc $500,000,000 5.000% SENIOR NOTES DUE 2032 (the “Notes”) PRICING TERM SHEET Terms Applicable to the Notes Issuers: Aon Corporation and Aon Global Holdings plc Guarantors: Aon plc and Aon Global Limited Offer

Filed pursuant to Rule 433 Relating to Preliminary Prospectus Supplement dated September 7, 2022 to Prospectus dated May 12, 2020 Registration Statement Nos.

September 7, 2022 424B5

Subject to completion, dated September 7, 2022

424B5 1 d391306d424b5.htm 424B5 Table of Contents Filed Pursuant to Rule 424(b)(5) Registration Statement Nos. 333-238189, 333-238189-01, 333-238189-02 and 333-238189-03 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and are not soliciting

September 6, 2022 8-K

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 1, 2022 Aon plc (Exact name of registrant as specified in its charter) Ireland 1-7933 98-1539969 (State or other jurisdiction of incorporation) (Commission File Number) (IRS

August 9, 2022 8-K

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 4, 2022 Aon plc (Exact name of registrant as specified in its charter) Ireland 1-7933 98-1539969 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Em

July 29, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 29, 2022 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employe

July 29, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2022 ☐ TRANSITION REPORT PURSUANT TO S

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2022 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 1-7933 Aon plc (Exact Name of Registrant as Specified in Its Chart

July 29, 2022 EX-99.1

Aon Reports Second Quarter 2022 Results

Exhibit 99.1 Investor Relations News from Aon Aon Reports Second Quarter 2022 Results Second Quarter Key Metrics ?Total revenue increased 3% to $3.0 billion, including organic revenue growth of 8% ?Operating margin increased 20 basis points to 23.5%, and operating margin, adjusted for certain items, increased 40 basis points to 26.2% ?EPS increased 40% to $2.33, and EPS, adjusted for certain items

July 29, 2022 EX-22.1

Subsidiary Guarantors and Issuers of Guaranteed Securities

Exhibit 22.1 Subsidiary Guarantors and Issuers of Guaranteed Securities The table below sets forth the respective issuers, co-issuers, and guarantors of the notes issued by Aon Global Limited, Aon Global Holdings plc, and Aon Corporation and the jurisdiction of incorporation of each such entity. Aon Corporation Aon Global Limited Aon Corporation and Aon Global Holdings plc Entity Jurisdiction of I

June 23, 2022 EX-10.1

Amendment to International Assignment Letter, dated June 21, 2022, between Aon Corporation and Christa Davies.

Exhibit 10.1 Christa Davies Aon Corporation United States June 21, 2022 International Assignment: Chicago, Illinois to London, England Dear Christa, This letter serves to amend your international assignment letter effective July 1, 2016 governing the terms of your international assignment from Chicago, Illinois to London, England (your ?International Assignment Letter?). Pursuant to this letter, t

June 23, 2022 EX-10.2

Amendment to International Assignment Letter, dated June 21, 2022, between Aon Corporation and Gregory C. Case – incorporated by reference to exhibit 10.2 to Aon’s Current Report on Form 8-K filed June 23, 2022.

Exhibit 10.2 Gregory Case Aon Corporation United States June 21, 2022 International Assignment: 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 London, England (your ?International Assignment Letter?). Pursuant to this letter, the te

June 23, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 17, 2022 Aon plc (Exact name of registrant as specified in its charter) Ireland 1-7933 98-1539969 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Emp

April 29, 2022 EX-22.1

Subsidiary Guarantors and Issuers of Guaranteed Securities

Exhibit 22.1 Subsidiary Guarantors and Issuers of Guaranteed Securities The table below sets forth the respective issuers, co-issuers, and guarantors of the notes issued by Aon Global Limited, Aon Global Holdings plc, and Aon Corporation and the jurisdiction of incorporation of each such entity. Aon Corporation Aon Global Limited Aon Corporation and Aon Global Holdings plc Entity Jurisdiction of I

April 29, 2022 EX-99.1

Aon Reports First Quarter 2022 Results

Exhibit 99.1 Investor Relations News from Aon Aon Reports First Quarter 2022 Results First Quarter Key Metrics ?Total revenue increased 4% to $3.7 billion, including organic revenue growth of 8% ?Operating margin increased 190 basis points to 37.2%, and operating margin, adjusted for certain items, increased 60 basis points to 38.0% ?EPS increased 18% to $4.73, and EPS, adjusted for certain items,

April 29, 2022 DEF 14A

Definitive Proxy Statement

Table of Contents SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO.

April 29, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 29, 2022 Aon plc (Exact Name of Registrant as Specified in Charter) Ireland 1-7933 98-1539969 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employ

April 29, 2022 DEFA14A

SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO. )

SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO.

April 29, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2022 ☐ TRANSITION REPORT PURSUANT TO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2022 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 1-7933 Aon plc (Exact Name of Registrant as Specified in Its Char

February 28, 2022 EX-4.2

Third Indenture Supplement, dated as of February 28, 2022, among Aon Corporation, AGH, the Guarantors and the Trustee.

Exhibit 4.2 AON CORPORATION AON GLOBAL HOLDINGS PLC THIRD INDENTURE SUPPLEMENT DATED AS OF FEBRUARY 28, 2022 TO THE AMENDED AND RESTATED INDENTURE DATED AS OF APRIL 1, 2020 THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. TRUSTEE DEBT SECURITIES THIS THIRD INDENTURE SUPPLEMENT (the ?Third Indenture Supplement?), is dated as of February 28, 2022, among Aon Corporation, a corporation duly organized a

February 28, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 23, 2022 Aon plc (Exact name of registrant as specified in its charter) Ireland 1-7933 95-1539969 (State or other jurisdiction of incorporation) (Commission File Number) (IRS

February 28, 2022 EX-1.1

Underwriting Agreement, dated February 23, 2022, among Aon Corporation, AGH, Aon plc and AGL, and Morgan Stanley & Co. LLC, Barclays Capital Inc., Credit Suisse Securities (USA) LLC and Deutsche Bank Securities Inc. as representatives of the several underwriters named therein.

Exhibit 1.1 Aon Corporation Aon Global Holdings plc Aon plc Aon Global Limited $600,000,000 2.850% Senior Notes due 2027 $900,000,000 3.900% Senior Notes due 2052 UNDERWRITING AGREEMENT February 23, 2022 Morgan Stanley & Co. LLC Barclays Capital Inc. Credit Suisse Securities (USA) LLC Deutsche Bank Securities Inc. As Representatives (the ?Representatives?) of the several Underwriters listed in Exh

February 28, 2022 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registr

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Aon plc Aon Global Limited (Exact Name of Registrant as Specified in Its Charter) (Exact Name of Registrant as Specified in Its Charter) Ireland England and Wales (Jurisdiction of Incorporation or Organization) (Jurisdiction of Incorporation or Organization) 98-1539969 98-1030901 (I.

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