AON

SEC source: 0001193125-26-055125 · ownership.xml · nonDerivative · entry 1

Stevens Lisa · CIK 0001792850 · Chief Administrative Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,925.1567

F1 · kind: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the eighteenth cycle of the Company's Leadership Performance Program. The number of shares issued was determined by the Organization and Compensation Committee of the Board of Directors on February 12, 2026, based on the Company's performance for the period from January 1, 2023 to December 31, 2025.

F1 · price: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the eighteenth cycle of the Company's Leadership Performance Program. The number of shares issued was determined by the Organization and Compensation Committee of the Board of Directors on February 12, 2026, based on the Company's performance for the period from January 1, 2023 to December 31, 2025.

F2 · balance_after: Includes shares acquired under the Aon employee stock purchase plan on June 30, 2025 and December 31, 2025.

SEC source: 0001193125-26-055101 · ownership.xml · derivative · entry 3

Reese Edmund · CIK 0001833903 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,337

Underlying: Class A Ordinary Shares · 2,337 shares

Expires 2029-02-12

F3 · derivative.exercise_price: The restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with Irish law, the reporting person agreed to pay the issuer the nominal value of $0.01 per share issued to the reporting person.

F4 · derivative.exercise_date: The restricted share unit award vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated, as follows: 33 1/3% of the award vests on each of the first through third anniversary of the date of the grant.

F4 · derivative.expiration_date: The restricted share unit award vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated, as follows: 33 1/3% of the award vests on each of the first through third anniversary of the date of the grant.

SEC source: 0001193125-26-055092 · ownership.xml · derivative · entry 4

Marcell Andy · CIK 0002076043 · Global CEO, Solution Lines

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,539

Underlying: Class A Ordinary Shares · 9,539 shares

Expires 2030-12-31

F3 · derivative.exercise_price: The restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with Irish law, the reporting person agreed to pay the issuer the nominal value of $0.01 per share issued to the reporting person.

F5 · derivative.exercise_date: The restricted share unit award shall vest in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated, as follows: 100% of the award will vest on December 31, 2030.

F5 · derivative.expiration_date: The restricted share unit award shall vest in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated, as follows: 100% of the award will vest on December 31, 2030.

SEC source: 0001193125-26-055092 · ownership.xml · derivative · entry 3

Marcell Andy · CIK 0002076043 · Global CEO, Solution Lines

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,226

Underlying: Class A Ordinary Shares · 2,226 shares

Expires 2029-02-12

F3 · derivative.exercise_price: The restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with Irish law, the reporting person agreed to pay the issuer the nominal value of $0.01 per share issued to the reporting person.

F4 · derivative.exercise_date: The restricted share unit award vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated, as follows: 33 1/3% of the award vests on each of the first through third anniversary of the date of the grant.

F4 · derivative.expiration_date: The restricted share unit award vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated, as follows: 33 1/3% of the award vests on each of the first through third anniversary of the date of the grant.

SEC source: 0001193125-26-055092 · ownership.xml · nonDerivative · entry 2

Marcell Andy · CIK 0002076043 · Global CEO, Solution Lines

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,983.356

F2 · kind: Class A Ordinary Shares withheld by the issuer for payment of taxes in connection with the vesting of the award.

SEC source: 0001193125-26-055092 · ownership.xml · nonDerivative · entry 1

Marcell Andy · CIK 0002076043 · Global CEO, Solution Lines

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,559.408

F1 · kind: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the eighteenth cycle of the Company's Leadership Performance Program. The number of shares issued was determined by the Organization and Compensation Committee of the Board of Directors on February 12, 2026, based on the Company's performance for the period from January 1, 2023 to December 31, 2025.

F1 · price: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the eighteenth cycle of the Company's Leadership Performance Program. The number of shares issued was determined by the Organization and Compensation Committee of the Board of Directors on February 12, 2026, based on the Company's performance for the period from January 1, 2023 to December 31, 2025.

SEC source: 0001193125-26-055083 · ownership.xml · derivative · entry 3

Goltermann Lori · CIK 0002062798 · CEO, Regions & North America

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,113

Underlying: Class A Ordinary Shares · 1,113 shares

Expires 2029-02-12

F4 · derivative.exercise_price: The restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with Irish law, the reporting person agreed to pay the issuer the nominal value of $0.01 per share issued to the reporting person.

F5 · derivative.exercise_date: The restricted share unit award vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated, as follows: 33 1/3% of the award vests on each of the first through third anniversary of the date of the grant.

F5 · derivative.expiration_date: The restricted share unit award vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated, as follows: 33 1/3% of the award vests on each of the first through third anniversary of the date of the grant.

SEC source: 0001193125-26-055083 · ownership.xml · nonDerivative · entry 2

Goltermann Lori · CIK 0002062798 · CEO, Regions & North America

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,502.771

F3 · kind: Class A Ordinary Shares withheld by the issuer for payment of taxes in connection with the vesting of the award.

SEC source: 0001193125-26-055083 · ownership.xml · nonDerivative · entry 1

Goltermann Lori · CIK 0002062798 · CEO, Regions & North America

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,216.109

F1 · kind: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the eighteenth cycle of the Company's Leadership Performance Program. The number of shares issued was determined by the Organization and Compensation Committee of the Board of Directors on February 12, 2026, based on the Company's performance for the period from January 1, 2023 to December 31, 2025.

F1 · price: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the eighteenth cycle of the Company's Leadership Performance Program. The number of shares issued was determined by the Organization and Compensation Committee of the Board of Directors on February 12, 2026, based on the Company's performance for the period from January 1, 2023 to December 31, 2025.

F2 · balance_after: Includes shares acquired under the Aon employee stock purchase plan on December 31, 2025.

SEC source: 0001193125-26-055060 · ownership.xml · nonDerivative · entry 4

Case Gregory C · CIK 0001322803 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 938,781.593

F2 · kind: Class A Ordinary Shares withheld by the issuer for payment of taxes in connection with the vesting of the award.

F3 · balance_after: On May 5, 2025, the GRAT returned 161,104 shares to the reporting person as an annuity payment; and on February 9, 2026 the GRAT returned 201,484 shares to the reporting person as an annuity payment.

F4 · balance_after: On November 7, 2025, the GRAT returned 63,500 shares to the reporting person as an annuity payment.

SEC source: 0001193125-26-055060 · ownership.xml · nonDerivative · entry 3

Case Gregory C · CIK 0001322803 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 940,840.612

F1 · kind: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the eighteenth cycle of the Company's Leadership Performance Program. The number of shares issued was determined by the Organization and Compensation Committee of the Board of Directors on February 12, 2026, based on the Company's performance for the period from January 1, 2023 to December 31, 2025.

F1 · price: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the eighteenth cycle of the Company's Leadership Performance Program. The number of shares issued was determined by the Organization and Compensation Committee of the Board of Directors on February 12, 2026, based on the Company's performance for the period from January 1, 2023 to December 31, 2025.

SEC source: 0001193125-26-055060 · ownership.xml · nonDerivative · entry 2

Case Gregory C · CIK 0001322803 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 936,251.612

F2 · kind: Class A Ordinary Shares withheld by the issuer for payment of taxes in connection with the vesting of the award.

SEC source: 0001193125-26-055060 · ownership.xml · nonDerivative · entry 1

Case Gregory C · CIK 0001322803 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 968,497.759

F1 · kind: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the eighteenth cycle of the Company's Leadership Performance Program. The number of shares issued was determined by the Organization and Compensation Committee of the Board of Directors on February 12, 2026, based on the Company's performance for the period from January 1, 2023 to December 31, 2025.

F1 · price: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the eighteenth cycle of the Company's Leadership Performance Program. The number of shares issued was determined by the Organization and Compensation Committee of the Board of Directors on February 12, 2026, based on the Company's performance for the period from January 1, 2023 to December 31, 2025.

SEC source: 0001193125-26-055079 · ownership.xml · derivative · entry 3

Corona Anne · CIK 0002062793 · Chief Commercial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 835

Underlying: Class A Ordinary Shares · 835 shares

Expires 2029-02-12

F3 · derivative.exercise_price: The restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with Irish law, the reporting person agreed to pay the issuer the nominal value of $0.01 per share issued to the reporting person.

F4 · derivative.exercise_date: The restricted share unit award vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated, as follows: 33 1/3% of the award vests on each of the first through third anniversary of the date of the grant.

F4 · derivative.expiration_date: The restricted share unit award vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated, as follows: 33 1/3% of the award vests on each of the first through third anniversary of the date of the grant.

SEC source: 0001193125-26-055079 · ownership.xml · nonDerivative · entry 2

Corona Anne · CIK 0002062793 · Chief Commercial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,990.368

F2 · kind: Class A Ordinary Shares withheld by the issuer for payment of taxes in connection with the vesting of the award.

SEC source: 0001193125-26-055079 · ownership.xml · nonDerivative · entry 1

Corona Anne · CIK 0002062793 · Chief Commercial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,395.077

F1 · kind: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the eighteenth cycle of the Company's Leadership Performance Program. The number of shares issued was determined by the Organization and Compensation Committee of the Board of Directors on February 12, 2026, based on the Company's performance for the period from January 1, 2023 to December 31, 2025.

F1 · price: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the eighteenth cycle of the Company's Leadership Performance Program. The number of shares issued was determined by the Organization and Compensation Committee of the Board of Directors on February 12, 2026, based on the Company's performance for the period from January 1, 2023 to December 31, 2025.

SEC source: 0001193125-26-048871 · ownership.xml · nonDerivative · entry 1

KNIGHT LESTER B · CIK 0001023262 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Family Partnership

Disclosed balance after: 143,000

F1 · price: The price reported is a weighted average price. Shares were purchased in a series of transactions within the same trading day at prices ranging from $319.00 to $319.47, inclusive. Full information regarding the number of shares purchased at each separate price is available upon request by the Commission staff, the issuer, or a security holder of the issuer

SEC source: 0001193125-25-312734 · ownership.xml · nonDerivative · entry 1

KNIGHT LESTER B · CIK 0001023262 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Personal Revocable Trust

Disclosed balance after: 26,033

F1 · kind: The reporting person transferred 7,878 Class A Ordinary Shares to a charitable foundation of which the reporting person and his spouse are trustees.

SEC source: 0001193125-25-294627 · ownership.xml · derivative · entry 3

Corona Anne · CIK 0002062793 · Chief Commercial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Ordinary Shares · 132 shares

Expires 2025-11-21

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: The restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with Irish law, the reporting person agreed to pay the issuer the nominal value of $0.01 per share issued to the reporting person.

F4 · derivative.exercise_date: A restricted share unit award was granted on November 21, 2022 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated: 33 1/3 of the award vests on each of the first through third anniversary of the date of grant.

F4 · derivative.expiration_date: A restricted share unit award was granted on November 21, 2022 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated: 33 1/3 of the award vests on each of the first through third anniversary of the date of grant.

SEC source: 0001193125-25-294627 · ownership.xml · nonDerivative · entry 2

Corona Anne · CIK 0002062793 · Chief Commercial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,224.077

F2 · kind: Class A Ordinary Shares withheld by the issuer for payment of taxes in connection with the vesting of the award.

SEC source: 0001193125-25-294627 · ownership.xml · nonDerivative · entry 1

Corona Anne · CIK 0002062793 · Chief Commercial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,289.521

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Class A Ordinary Shares acquired upon the vesting of a restricted share unit award.

F1 · price: Class A Ordinary Shares acquired upon the vesting of a restricted share unit award.

SEC source: 0001193125-25-294621 · ownership.xml · derivative · entry 3

Goltermann Lori · CIK 0002062798 · CEO, Regions & North America

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Ordinary Shares · 156 shares

Expires 2025-11-21

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_price: The restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with Irish law, the reporting person agreed to pay the issuer the nominal value of $0.01 per share issued to the reporting person.

F5 · derivative.exercise_date: A restricted share unit award was granted on November 21, 2022 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated: 33 1/3 of the award vests on each of the first through third anniversary of the date of grant.

F5 · derivative.expiration_date: A restricted share unit award was granted on November 21, 2022 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated: 33 1/3 of the award vests on each of the first through third anniversary of the date of grant.

SEC source: 0001193125-25-294621 · ownership.xml · nonDerivative · entry 2

Goltermann Lori · CIK 0002062798 · CEO, Regions & North America

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,255.494

F2 · kind: Class A Ordinary Shares withheld by the issuer for payment of taxes in connection with the vesting of the award.

F3 · balance_after: Includes shares acquired under the Aon employee stock purchase plan on June 30, 2025.

SEC source: 0001193125-25-294621 · ownership.xml · nonDerivative · entry 1

Goltermann Lori · CIK 0002062798 · CEO, Regions & North America

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,323.587

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Class A Ordinary Shares acquired upon the vesting of a restricted share unit award.

F1 · price: Class A Ordinary Shares acquired upon the vesting of a restricted share unit award.

SEC source: 0001193125-25-294616 · ownership.xml · derivative · entry 3

Marcell Andy · CIK 0002076043 · Global CEO, Solution Lines

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Ordinary Shares · 86 shares

Expires 2025-11-21

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: The restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with Irish law, the reporting person agreed to pay the issuer the nominal value of $0.01 per share issued to the reporting person.

F4 · derivative.exercise_date: A restricted share unit award was granted on November 21, 2022 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated: 33 1/3 of the award vests on each of the first through third anniversary of the date of grant.

F4 · derivative.expiration_date: A restricted share unit award was granted on November 21, 2022 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated: 33 1/3 of the award vests on each of the first through third anniversary of the date of grant.

SEC source: 0001193125-25-294616 · ownership.xml · nonDerivative · entry 2

Marcell Andy · CIK 0002076043 · Global CEO, Solution Lines

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,677.408

F2 · kind: Class A Ordinary Shares withheld by the issuer for payment of taxes in connection with the vesting of the award.

SEC source: 0001193125-25-294616 · ownership.xml · nonDerivative · entry 1

Marcell Andy · CIK 0002076043 · Global CEO, Solution Lines

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,719.289

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Class A Ordinary Shares acquired upon the vesting of a restricted share unit award.

F1 · price: Class A Ordinary Shares acquired upon the vesting of a restricted share unit award.

SEC source: 0001193125-25-286141 · ownership.xml · derivative · entry 3

Simon Mindy F. · CIK 0001925598 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Ordinary Shares · 1,970 shares

Expires 2025-11-15

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: The restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with Irish law, the reporting person agreed to pay the issuer the nominal value of US$0.01 per share issued to the reporting person.

F4 · derivative.exercise_date: A restricted share unit award was granted on November 15, 2022 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated: 33 1/3% of the award vests on each of the first through third anniversary of the date of grant.

F4 · derivative.expiration_date: A restricted share unit award was granted on November 15, 2022 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated: 33 1/3% of the award vests on each of the first through third anniversary of the date of grant.

SEC source: 0001193125-25-286141 · ownership.xml · nonDerivative · entry 2

Simon Mindy F. · CIK 0001925598 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,179.421

F2 · kind: Class A Ordinary Shares withheld by the issuer for payment of taxes in connection with the vesting of the award.

SEC source: 0001193125-25-286141 · ownership.xml · nonDerivative · entry 1

Simon Mindy F. · CIK 0001925598 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,785.634

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Class A Ordinary Shares acquired upon the vesting of a restricted share unit award.

F1 · price: Class A Ordinary Shares acquired upon the vesting of a restricted share unit award.

SEC source: 0001193125-25-283163 · ownership.xml · nonDerivative · entry 2

SANTONA GLORIA · CIK 0001179714 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Trust

Disclosed balance after: 17,736

F1 · kind: On November 12, 2025 the reporting person contributed 17,736 shares to a spousal lifetime access trust.

F1 · price: On November 12, 2025 the reporting person contributed 17,736 shares to a spousal lifetime access trust.

SEC source: 0001193125-25-283163 · ownership.xml · nonDerivative · entry 1

SANTONA GLORIA · CIK 0001179714 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,871.97

F1 · kind: On November 12, 2025 the reporting person contributed 17,736 shares to a spousal lifetime access trust.

F1 · price: On November 12, 2025 the reporting person contributed 17,736 shares to a spousal lifetime access trust.

SEC source: 0001193125-25-272328 · ownership.xml · nonDerivative · entry 2

Zeidel Darren · CIK 0001782945 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,253.161

F2 · price: The price reported is a weighted average price. Shares were sold in a series of transactions within the same trading day at prices ranging from $345.00 to $344.51, inclusive. Full information regarding the number of shares sold at each separate price is available upon request by the Commission staff, the issuer, or a security holder of the issuer.

SEC source: 0001193125-25-272328 · ownership.xml · nonDerivative · entry 1

Zeidel Darren · CIK 0001782945 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,483.161

F1 · price: The price reported is a weighted average price. Shares were sold in a series of transactions within the same trading day at prices ranging from $344.00 to $344.99, inclusive. Full information regarding the number of shares sold at each separate price is available upon request by the Commission staff, the issuer, or a security holder of the issuer.

SEC source: 0001193125-25-225123 · ownership.xml · nonDerivative · entry 2

Jenkins Jo Ann · CIK 0001751049 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 284.447

F2 · kind: Class A Ordinary Shares withheld by the issuer for payment of taxes in connection with the award.

SEC source: 0001193125-25-225123 · ownership.xml · nonDerivative · entry 1

Jenkins Jo Ann · CIK 0001751049 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 547

F1 · kind: Class A Ordinary Shares granted annually to each non-employee director of Aon plc. In connection with the election of Jo Ann Jenkins as a director of Aon plc effective August 15, 2025, the Board of Directors granted fully vested Aon plc Class A Ordinary Shares to Ms. Jenkins to reflect pro-ration for the period of service from August 15, 2025 through June 26, 2026. In accordance with Irish law, reporting person agreed to pay the issuer the nominal value of US $0.01 per share issued to the reporting person.

F1 · price: Class A Ordinary Shares granted annually to each non-employee director of Aon plc. In connection with the election of Jo Ann Jenkins as a director of Aon plc effective August 15, 2025, the Board of Directors granted fully vested Aon plc Class A Ordinary Shares to Ms. Jenkins to reflect pro-ration for the period of service from August 15, 2025 through June 26, 2026. In accordance with Irish law, reporting person agreed to pay the issuer the nominal value of US $0.01 per share issued to the reporting person.

SEC source: 0000950170-25-093840 · ownership.xml · derivative · entry 3

Reese Edmund · CIK 0001833903 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,950

Underlying: Class A Ordinary Shares · 3,975 shares

Expires 2027-07-01

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: The restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with Irish law, the reporting person agreed to pay the issuer the nominal value of $0.01 per share issued to the reporting person.

F4 · derivative.exercise_date: A restricted share unit award was granted on July 1, 2024 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated: 33 1/3% of the award vests on each of the first through third anniversary of the date of grant.

F4 · derivative.expiration_date: A restricted share unit award was granted on July 1, 2024 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated: 33 1/3% of the award vests on each of the first through third anniversary of the date of grant.

SEC source: 0000950170-25-093840 · ownership.xml · nonDerivative · entry 2

Reese Edmund · CIK 0001833903 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,776.886

F2 · kind: Class A Ordinary Shares withheld by the issuer for payment of taxes in connection with the vesting of the award.

SEC source: 0000950170-25-093840 · ownership.xml · nonDerivative · entry 1

Reese Edmund · CIK 0001833903 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,975

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Class A Ordinary Shares acquired upon the vesting of a restricted share unit award.

F1 · price: Class A Ordinary Shares acquired upon the vesting of a restricted share unit award.

SEC source: 0000950170-25-091784 · ownership.xml · nonDerivative · entry 1

KNIGHT LESTER B · CIK 0001023262 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,739

F1 · kind: Class A Ordinary Shares granted annually to each non-employee director of Aon plc. In accordance with Irish law, reporting person agreed to pay the issuer the nominal value of US $0.01 per share issued to the reporting person.

F1 · price: Class A Ordinary Shares granted annually to each non-employee director of Aon plc. In accordance with Irish law, reporting person agreed to pay the issuer the nominal value of US $0.01 per share issued to the reporting person.

SEC source: 0000950170-25-091796 · ownership.xml · nonDerivative · entry 2

STAVRIDIS JAMES G. · CIK 0001661859 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 787.654

F2 · kind: Class A Ordinary Shares withheld by the issuer for payment of taxes in connection with the award.

SEC source: 0000950170-25-091796 · ownership.xml · nonDerivative · entry 1

STAVRIDIS JAMES G. · CIK 0001661859 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 940.53

F1 · kind: Class A Ordinary Shares granted annually to each non-employee director of Aon plc. In accordance with Irish law, reporting person agreed to pay the issuer the nominal value of US $0.01 per share issued to the reporting person.

F1 · price: Class A Ordinary Shares granted annually to each non-employee director of Aon plc. In accordance with Irish law, reporting person agreed to pay the issuer the nominal value of US $0.01 per share issued to the reporting person.

SEC source: 0000950170-25-091777 · ownership.xml · nonDerivative · entry 2

Alvarez Jose Antonio · CIK 0001541177 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 866.86

F2 · kind: Class A Ordinary Shares withheld by the issuer for payment of taxes in connection with the award.

SEC source: 0000950170-25-091777 · ownership.xml · nonDerivative · entry 1

Alvarez Jose Antonio · CIK 0001541177 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,172.612

F1 · kind: Class A Ordinary Shares granted annually to each non-employee director of Aon plc. In accordance with Irish law, reporting person agreed to pay the issuer the nominal value of US $0.01 per share issued to the reporting person.

F1 · price: Class A Ordinary Shares granted annually to each non-employee director of Aon plc. In accordance with Irish law, reporting person agreed to pay the issuer the nominal value of US $0.01 per share issued to the reporting person.

SEC source: 0000950170-25-091734 · ownership.xml · nonDerivative · entry 2

Spruell Byron · CIK 0001831278 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,786.97

F2 · kind: Class A Ordinary Shares withheld by the issuer for payment of taxes in connection with the award.

SEC source: 0000950170-25-091734 · ownership.xml · nonDerivative · entry 1

Spruell Byron · CIK 0001831278 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,939.846

F1 · kind: Class A Ordinary Shares granted annually to each non-employee director of Aon plc. In accordance with Irish law, reporting person agreed to pay the issuer the nominal value of US $0.01 per share issued to the reporting person.

F1 · price: Class A Ordinary Shares granted annually to each non-employee director of Aon plc. In accordance with Irish law, reporting person agreed to pay the issuer the nominal value of US $0.01 per share issued to the reporting person.

SEC source: 0000950170-25-091731 · ownership.xml · nonDerivative · entry 2

SMITH SARAH G · CIK 0001090335 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,523.97

F2 · kind: Class A Ordinary Shares withheld by the issuer for payment of taxes in connection with the award.

SEC source: 0000950170-25-091731 · ownership.xml · nonDerivative · entry 1

SMITH SARAH G · CIK 0001090335 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,676.846

F1 · kind: Class A Ordinary Shares granted annually to each non-employee director of Aon plc. In accordance with Irish law, reporting person agreed to pay the issuer the nominal value of US $0.01 per share issued to the reporting person.

F1 · price: Class A Ordinary Shares granted annually to each non-employee director of Aon plc. In accordance with Irish law, reporting person agreed to pay the issuer the nominal value of US $0.01 per share issued to the reporting person.

SEC source: 0000950170-25-091720 · ownership.xml · nonDerivative · entry 2

NOTEBAERT RICHARD C · CIK 0001112731 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 29,175.97

F2 · kind: Class A Ordinary Shares withheld by the issuer for payment of taxes in connection with the award.

SEC source: 0000950170-25-091720 · ownership.xml · nonDerivative · entry 1

NOTEBAERT RICHARD C · CIK 0001112731 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 29,328.846

F1 · kind: Class A Ordinary Shares granted annually to each non-employee director of Aon plc. In accordance with Irish law, reporting person agreed to pay the issuer the nominal value of US $0.01 per share issued to the reporting person.

F1 · price: Class A Ordinary Shares granted annually to each non-employee director of Aon plc. In accordance with Irish law, reporting person agreed to pay the issuer the nominal value of US $0.01 per share issued to the reporting person.