AON

SEC source: 0001209191-21-010990 · doc4.xml · nonDerivative · entry 6

Goland Anthony R · CIK 0001669783 · Chief Innovation Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,977

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

SEC source: 0001209191-21-010990 · doc4.xml · nonDerivative · entry 5

Goland Anthony R · CIK 0001669783 · Chief Innovation Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,220

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

F3 · price: Class A Ordinary Shares acquired upon the vesting of a restricted share unit award.

SEC source: 0001209191-21-010990 · doc4.xml · nonDerivative · entry 4

Goland Anthony R · CIK 0001669783 · Chief Innovation Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,635

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

SEC source: 0001209191-21-010990 · doc4.xml · nonDerivative · entry 3

Goland Anthony R · CIK 0001669783 · Chief Innovation Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,674

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

F3 · price: Class A Ordinary Shares acquired upon the vesting of a restricted share unit award.

SEC source: 0001209191-21-011506 · doc4.xml · derivative · entry 12

Davies Christa · CIK 0001419356 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,101

Underlying: Class A Ordinary Shares · 1,100 shares

Expires 2022-02-14

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.

F9 · 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.

F11 · derivative.exercise_date: A restricted share unit award was granted on February 14, 2019 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan: 33 1/3% of the award vests on each of the first through third anniversary of the date of grant.

F11 · derivative.expiration_date: A restricted share unit award was granted on February 14, 2019 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan: 33 1/3% of the award vests on each of the first through third anniversary of the date of grant.

SEC source: 0001209191-21-011506 · doc4.xml · derivative · entry 11

Davies Christa · CIK 0001419356 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Ordinary Shares · 1,193 shares

Expires 2021-02-15

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.

F9 · 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.

F10 · derivative.exercise_date: A restricted share unit award was granted on February 15, 2018 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan: 33 1/3% of the award vests on each of the first through third anniversary of the date of grant.

F10 · derivative.expiration_date: A restricted share unit award was granted on February 15, 2018 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan: 33 1/3% of the award vests on each of the first through third anniversary of the date of grant.

SEC source: 0001209191-21-011506 · doc4.xml · nonDerivative · entry 9

Davies Christa · CIK 0001419356 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 211,015

F8 · kind: Class A Ordinary Shares withheld by the issuer for payment of withholding taxes in connection with the vesting of the award.

SEC source: 0001209191-21-011506 · doc4.xml · nonDerivative · entry 8

Davies Christa · CIK 0001419356 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 211,457

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.

F7 · kind: Class A Ordinary Shares acquired upon the vesting of a restricted share unit award.

F7 · price: Class A Ordinary Shares acquired upon the vesting of a restricted share unit award.

SEC source: 0001209191-21-011506 · doc4.xml · nonDerivative · entry 7

Davies Christa · CIK 0001419356 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 210,264

F8 · kind: Class A Ordinary Shares withheld by the issuer for payment of withholding taxes in connection with the vesting of the award.

SEC source: 0001209191-21-011506 · doc4.xml · nonDerivative · entry 6

Davies Christa · CIK 0001419356 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 210,671

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.

F7 · kind: Class A Ordinary Shares acquired upon the vesting of a restricted share unit award.

F7 · price: Class A Ordinary Shares acquired upon the vesting of a restricted share unit award.

SEC source: 0001209191-21-011506 · doc4.xml · nonDerivative · entry 5

Davies Christa · CIK 0001419356 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 209,571

F2 · price: The transactions reported were effected pursuant to a trading plan meeting the requirements of SEC Rule 10b5-1 entered into on November 3, 2020.

F6 · 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 $230.295 to $231.005, 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: 0001209191-21-011506 · doc4.xml · nonDerivative · entry 4

Davies Christa · CIK 0001419356 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 212,371

F2 · price: The transactions reported were effected pursuant to a trading plan meeting the requirements of SEC Rule 10b5-1 entered into on November 3, 2020.

F5 · 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 $229.29 to $230.26, 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: 0001209191-21-011506 · doc4.xml · nonDerivative · entry 3

Davies Christa · CIK 0001419356 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 217,969

F2 · price: The transactions reported were effected pursuant to a trading plan meeting the requirements of SEC Rule 10b5-1 entered into on November 3, 2020.

F4 · 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 $228.245 to $229.23, 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: 0001209191-21-011506 · doc4.xml · nonDerivative · entry 2

Davies Christa · CIK 0001419356 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 223,772

F2 · price: The transactions reported were effected pursuant to a trading plan meeting the requirements of SEC Rule 10b5-1 entered into on November 3, 2020.

F3 · 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 $227.245 to $228.23, 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: 0001209191-21-011506 · doc4.xml · nonDerivative · entry 1

Davies Christa · CIK 0001419356 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 242,401

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 $226.24 to $227.235, 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.

F2 · price: The transactions reported were effected pursuant to a trading plan meeting the requirements of SEC Rule 10b5-1 entered into on November 3, 2020.

SEC source: 0001209191-21-011057 · doc4.xml · nonDerivative · entry 2

BRUNO JOHN G · CIK 0001283118 · Section 16 Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 75,113.65

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

SEC source: 0001209191-21-011057 · doc4.xml · nonDerivative · entry 1

BRUNO JOHN G · CIK 0001283118 · Section 16 Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 86,690.65

F1 · kind: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the thirteenth 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 11, 2021, based on the Company's performance for the period from January 1, 2018 to December 31, 2020.

F1 · price: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the thirteenth 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 11, 2021, based on the Company's performance for the period from January 1, 2018 to December 31, 2020.

SEC source: 0001209191-21-011046 · doc4.xml · derivative · entry 9

Weitz Andy · CIK 0001786688 · Chief Marketing Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 916

Underlying: Class A Ordinary Shares · 916 shares

Expires 2024-02-11

F5 · 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.

F6 · derivative.exercise_date: The restricted share unit award vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan as follows: 33 1/3% of the award vests on each of the first through third anniversary of the date of the grant.

F6 · derivative.expiration_date: The restricted share unit award vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan 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: 0001209191-21-011046 · doc4.xml · nonDerivative · entry 2

Weitz Andy · CIK 0001786688 · Chief Marketing Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,172

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

SEC source: 0001209191-21-011046 · doc4.xml · nonDerivative · entry 1

Weitz Andy · CIK 0001786688 · Chief Marketing Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,360

F1 · kind: On April 1, 2020, Aon plc, an Irish public limited company (the "Company"), became the successor of Aon plc, a public limited company incorporated under the laws of England and Wales ("Aon UK"), pursuant to a scheme of arrangement under English law. Pursuant to the transaction, all outstanding Class A ordinary shares of Aon UK were exchanged, on a one-for-one basis, for Class A ordinary shares of the Company, and Aon UK became a wholly owned subsidiary of the Company. The transaction did not alter the proportionate interests of security holders.

F2 · kind: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the thirteenth 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 11, 2021, based on the Company's performance for the period from January 1, 2018 to December 31, 2020.

F2 · price: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the thirteenth 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 11, 2021, based on the Company's performance for the period from January 1, 2018 to December 31, 2020.

SEC source: 0001209191-21-011034 · doc4.xml · derivative · entry 5

Zeidel Darren · CIK 0001782945 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,374

Underlying: Class A Ordinary Shares · 1,374 shares

Expires 2024-02-11

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 US$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 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 follows: 33 1/3% of the award vests on each of the first through third anniversary of the date of the grant.

SEC source: 0001209191-21-011034 · doc4.xml · nonDerivative · entry 2

Zeidel Darren · CIK 0001782945 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,984

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

SEC source: 0001209191-21-011034 · doc4.xml · nonDerivative · entry 1

Zeidel Darren · CIK 0001782945 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,201

F1 · kind: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the thirteenth 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 11, 2021, based on the Company's performance for the period from January 1, 2018 to December 31, 2020.

F1 · price: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the thirteenth 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 11, 2021, based on the Company's performance for the period from January 1, 2018 to December 31, 2020.

SEC source: 0001209191-21-011023 · doc4.xml · nonDerivative · entry 8

Case Gregory C · CIK 0001322803 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 491,371

F7 · kind: Class A Ordinary Shares withheld by the issuer for payment of withholding taxes in connection with the vesting of the award.

SEC source: 0001209191-21-011023 · doc4.xml · nonDerivative · entry 7

Case Gregory C · CIK 0001322803 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 553,401

F6 · kind: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the thirteenth 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 11, 2021, based on the Company's performance for the period from January 1, 2018 to December 31, 2020.

F6 · price: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the thirteenth 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 11, 2021, based on the Company's performance for the period from January 1, 2018 to December 31, 2020.

SEC source: 0001209191-21-011014 · doc4.xml · derivative · entry 9

Neller Michael · CIK 0001732938 · Principal Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 488

Underlying: Class A Ordinary Shares · 488 shares

Expires 2024-02-11

F6 · 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.

F7 · derivative.exercise_date: The restricted share unit award vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan as follows: 33 1/3% of the award vests on each of the first through third anniversary of the date of the grant.

F7 · derivative.expiration_date: The restricted share unit award vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan 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: 0001209191-21-011014 · doc4.xml · nonDerivative · entry 4

Neller Michael · CIK 0001732938 · Principal Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,338

F4 · kind: Class A Ordinary Shares withheld by issuer for the payment of withholding taxes in connection with the award.

SEC source: 0001209191-21-011014 · doc4.xml · nonDerivative · entry 3

Neller Michael · CIK 0001732938 · Principal Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,335

F3 · kind: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the thirteenth 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 11, 2021, based on the Company's performance for the period from January 1, 2018 to December 31, 2020.

F3 · price: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the thirteenth 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 11, 2021, based on the Company's performance for the period from January 1, 2018 to December 31, 2020.

SEC source: 0001209191-21-011017 · doc4.xml · derivative · entry 5

Stevens Lisa · CIK 0001792850 · Chief People Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,526

Underlying: Class A Ordinary Shares · 1,526 shares

Expires 2024-02-11

F5 · 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.

F6 · derivative.exercise_date: The restricted share unit award vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan as follows: 33 1/3% of the award vests on each of the first through third anniversary of the date of the grant.

F6 · derivative.expiration_date: The restricted share unit award vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan 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: 0001209191-21-011007 · doc4.xml · derivative · entry 7

Andersen Eric · CIK 0001697695 · President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,289

Underlying: Class A Ordinary Shares · 2,289 shares

Expires 2024-02-11

F5 · 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.

F6 · derivative.exercise_date: The restricted share unit award vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan as follows: 33 1/3% of the award vests on each of the first through third anniversary of the date of the grant.

F6 · derivative.expiration_date: The restricted share unit award vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan 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: 0001209191-21-011007 · doc4.xml · nonDerivative · entry 2

Andersen Eric · CIK 0001697695 · President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 112,767.001

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

SEC source: 0001209191-21-011007 · doc4.xml · nonDerivative · entry 1

Andersen Eric · CIK 0001697695 · President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 127,088.001

F1 · kind: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the thirteenth 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 11, 2021, based on the Company's performance for the period from January 1, 2018 to December 31, 2020.

F1 · price: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the thirteenth 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 11, 2021, based on the Company's performance for the period from January 1, 2018 to December 31, 2020.

F2 · balance_after: Includes shares acquired under Aon employee stock purchase plan on December 31, 2020.

SEC source: 0001209191-21-011001 · doc4.xml · derivative · entry 3

Davies Christa · CIK 0001419356 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,053

Underlying: Class A Ordinary Shares · 3,053 shares

Expires 2024-02-11

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 US$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 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 follows: 33 1/3% of the award vests on each of the first through third anniversary of the date of the grant.

SEC source: 0001209191-21-011001 · doc4.xml · nonDerivative · entry 2

Davies Christa · CIK 0001419356 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 246,546

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

SEC source: 0001209191-21-011001 · doc4.xml · nonDerivative · entry 1

Davies Christa · CIK 0001419356 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 264,047

F1 · kind: On April 1, 2020, Aon plc, an Irish public limited company (the "Company"), became the successor of Aon plc, a public limited company incorporated under the laws of England and Wales ("Aon UK"), pursuant to a scheme of arrangement under English law. Pursuant to the transaction, all outstanding Class A ordinary shares of Aon UK were exchanged, on a one-for-one basis, for Class A ordinary shares of the Company, and Aon UK became a wholly owned subsidiary of the Company. The transaction did not alter the proportionate interests of security holders.

F2 · kind: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the thirteenth 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 11, 2021, based on the Company's performance for the period from January 1, 2018 to December 31, 2020.

F2 · price: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the thirteenth 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 11, 2021, based on the Company's performance for the period from January 1, 2018 to December 31, 2020.

SEC source: 0001209191-21-010990 · doc4.xml · derivative · entry 9

Goland Anthony R · CIK 0001669783 · Chief Innovation Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 893

Underlying: Class A Ordinary Shares · 893 shares

Expires 2024-02-11

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 US$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 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 follows: 33 1/3% of the award vests on each of the first through third anniversary of the date of the grant.

SEC source: 0001209191-21-010990 · doc4.xml · nonDerivative · entry 2

Goland Anthony R · CIK 0001669783 · Chief Innovation Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,575

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

SEC source: 0001209191-21-010990 · doc4.xml · nonDerivative · entry 1

Goland Anthony R · CIK 0001669783 · Chief Innovation Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 36,847

F1 · kind: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the thirteenth 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 11, 2021, based on the Company's performance for the period from January 1, 2018 to December 31, 2020.

F1 · price: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the thirteenth 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 11, 2021, based on the Company's performance for the period from January 1, 2018 to December 31, 2020.

SEC source: 0001209191-21-009851 · doc5.xml · nonDerivative · entry 2

BRUNO JOHN G · CIK 0001283118 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · By SLAT

Disclosed balance after: 6,900

F1 · kind: Represents gift of Class A Ordinary Shares of Aon plc to a Spousal Lifetime Access Trust ("SLAT") for the benefit of the reporting person's spouse. The spouse and another family member of the reporting person serve as co-trustees of the SLAT. The Reporting Person disclaims beneficial ownership of the shares in the SLAT.

SEC source: 0001209191-21-009851 · doc5.xml · nonDerivative · entry 1

BRUNO JOHN G · CIK 0001283118 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 62,784.65

F1 · kind: Represents gift of Class A Ordinary Shares of Aon plc to a Spousal Lifetime Access Trust ("SLAT") for the benefit of the reporting person's spouse. The spouse and another family member of the reporting person serve as co-trustees of the SLAT. The Reporting Person disclaims beneficial ownership of the shares in the SLAT.

SEC source: 0001209191-21-011014 · doc4.xml · nonDerivative · entry 2

Neller Michael · CIK 0001732938 · Principal Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 3,459

F1 · kind: Represents the transfer of shares previously reported as directly held by Reporting Person to GMN Capital, LLC.

F2 · ownership.nature: Represents shares held by GMN Capital, LLC (the "LLC"). The LLC is a manager-managed limited liability company, and Reporting Person is a Manager.

SEC source: 0001209191-21-011014 · doc4.xml · nonDerivative · entry 1

Neller Michael · CIK 0001732938 · Principal Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · kind: Represents the transfer of shares previously reported as directly held by Reporting Person to GMN Capital, LLC.

SEC source: 0001209191-20-060585 · doc4.xml · derivative · entry 3

Zeidel Darren · CIK 0001782945 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 354

Underlying: Class A Ordinary Shares · 354 shares

Expires 2021-11-21

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 US$0.01 per share issued to the reporting person.

F4 · derivative.exercise_date: A restricted share unit award was granted on November 21, 2016 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan: 20% of the award vests on each of the first through fifth anniversary of the date of the grant.

F4 · derivative.expiration_date: A restricted share unit award was granted on November 21, 2016 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan: 20% of the award vests on each of the first through fifth anniversary of the date of the grant.

SEC source: 0001209191-20-060585 · doc4.xml · nonDerivative · entry 2

Zeidel Darren · CIK 0001782945 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,198

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

SEC source: 0001209191-20-060585 · doc4.xml · nonDerivative · entry 1

Zeidel Darren · CIK 0001782945 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,355

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: 0001209191-20-060268 · doc4.xml · nonDerivative · entry 1

Spruell Byron · CIK 0001831278 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 575

F1 · kind: Class A Ordinary Shares granted annually to each non-employee director of Aon plc. In connection with the election of Mr. Bryon Spruell as a member of the Board effective October 27, 2020, the Board of Directors granted fully vested Aon plc ordinary shares to Mr. Spruell to reflect pro-ration for the period of service from October 27, 2020 through June 25, 2021. 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 Mr. Bryon Spruell as a member of the Board effective October 27, 2020, the Board of Directors granted fully vested Aon plc ordinary shares to Mr. Spruell to reflect pro-ration for the period of service from October 27, 2020 through June 25, 2021. 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: 0001209191-21-011017 · doc4.xml · nonDerivative · entry 2

Stevens Lisa · CIK 0001792850 · Chief People Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 410.821

SEC source: 0001209191-20-058025 · doc4.xml · nonDerivative · entry 1

Andersen Eric · CIK 0001697695 · President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 96,467.404

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 $197.440 to $197.485, 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.

F2 · balance_after: Includes shares acquired under Aon employee stock purchase plan on June 30, 2020.

SEC source: 0001209191-20-057784 · doc4.xml · nonDerivative · entry 1

BRUNO JOHN G · CIK 0001283118 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 69,684.65

F1 · kind: On April 1, 2020, Aon plc, an Irish public limited company (the "Company"), became the successor of Aon plc, a public limited company incorporated under the laws of England and Wales ("Aon UK"), pursuant to a scheme of arrangement under English law. Pursuant to the transaction, all outstanding Class A ordinary shares of Aon UK were exchanged, on a one-for-one basis, for Class A ordinary shares of the Company, and Aon UK became a wholly owned subsidiary of the Company. The transaction did not alter the proportionate interests of security holders.

SEC source: 0001209191-21-011023 · doc4.xml · nonDerivative · entry 6

Case Gregory C · CIK 0001322803 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · By GRAT

Disclosed balance after: 400,000

F4 · kind: Represents an exempt transfer (under Rule 16a-13) of shares previously reported as directly held by Reporting Person to a grantor retained annuity trust.

F4 · price: Represents an exempt transfer (under Rule 16a-13) of shares previously reported as directly held by Reporting Person to a grantor retained annuity trust.

F5 · ownership.nature: Represents shares held by a grantor retained annuity trust, for which Reporting Person is trustee and sole beneficiary.