AON

SEC source: 0001209191-18-011645 · doc4.xml · nonDerivative · entry 4

BRUNO JOHN G · CIK 0001283118 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,755.65

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: 0001209191-18-011645 · doc4.xml · nonDerivative · entry 3

BRUNO JOHN G · CIK 0001283118 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,185.65

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

F4 · price: Class A Ordinary Shares acquired upon the vesting of a restricted share unit award.

SEC source: 0001209191-18-011775 · doc4.xml · derivative · entry 9

Andersen Eric · CIK 0001697695 · CEO, Aon Benfield

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,012

Underlying: Class A Ordinary Shares · 2,012 shares

Expires 2021-02-15

F5 · derivative.exercise_price: The restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with U.K. 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: 0001209191-18-011775 · doc4.xml · nonDerivative · entry 2

Andersen Eric · CIK 0001697695 · CEO, Aon Benfield

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 70,928.49

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: 0001209191-18-011775 · doc4.xml · nonDerivative · entry 1

Andersen Eric · CIK 0001697695 · CEO, Aon Benfield

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 87,192.49

F1 · kind: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the tenth 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 15, 2018, based on the Company's performance for the period from January 1, 2015 to December 31, 2017.

F1 · price: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the tenth 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 15, 2018, based on the Company's performance for the period from January 1, 2015 to December 31, 2017.

F2 · balance_after: Includes shares acquired under the Aon employee stock purchase plan on December 29, 2017.

SEC source: 0001209191-18-011772 · doc4.xml · derivative · entry 9

O'Connor Michael J · CIK 0001506411 · CEO, Aon Risk Solutions

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,012

Underlying: Class A Ordinary Shares · 2,012 shares

Expires 2021-02-15

F4 · derivative.exercise_price: The restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with U.K. 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: 0001209191-18-011772 · doc4.xml · nonDerivative · entry 2

O'Connor Michael J · CIK 0001506411 · CEO, Aon Risk Solutions

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 133,515

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: 0001209191-18-011772 · doc4.xml · nonDerivative · entry 1

O'Connor Michael J · CIK 0001506411 · CEO, Aon Risk Solutions

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 149,190

F1 · kind: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the tenth 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 15, 2018, based on the Company's performance for the period from January 1, 2015 to December 31, 2017.

F1 · price: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the tenth 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 15, 2018, based on the Company's performance for the period from January 1, 2015 to December 31, 2017.

SEC source: 0001209191-18-011768 · doc4.xml · derivative · entry 9

Zern John · CIK 0001705528 · CEO, Aon Global Health

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,565

Underlying: Class A Ordinary Shares · 1,565 shares

Expires 2021-02-15

F4 · derivative.exercise_price: The restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with U.K. 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: 0001209191-18-011768 · doc4.xml · nonDerivative · entry 2

Zern John · CIK 0001705528 · CEO, Aon Global Health

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,856

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: 0001209191-18-011768 · doc4.xml · nonDerivative · entry 1

Zern John · CIK 0001705528 · CEO, Aon Global Health

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,641

F1 · kind: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the tenth 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 15, 2018, based on the Company's performance for the period from January 1, 2015 to December 31, 2017.

F1 · price: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the tenth 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 15, 2018, based on the Company's performance for the period from January 1, 2015 to December 31, 2017.

SEC source: 0001209191-18-011752 · doc4.xml · derivative · entry 13

Davies Christa · CIK 0001419356 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,577

Underlying: Class A Ordinary Shares · 3,577 shares

Expires 2021-02-15

F7 · derivative.exercise_price: The restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with U.K. law, the reporting person agreed to pay the issuer the nominal value of US$0.01 per share issued to the reporting person.

F8 · 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.

F8 · 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: 0001209191-18-011752 · doc4.xml · nonDerivative · entry 4

Davies Christa · CIK 0001419356 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 328,257

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: 0001209191-18-011752 · doc4.xml · nonDerivative · entry 3

Davies Christa · CIK 0001419356 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 370,027

F1 · kind: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the tenth 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 15, 2018, based on the Company's performance for the period from January 1, 2015 to December 31, 2017.

F1 · price: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the tenth 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 15, 2018, based on the Company's performance for the period from January 1, 2015 to December 31, 2017.

SEC source: 0001209191-18-011752 · doc4.xml · nonDerivative · entry 2

Davies Christa · CIK 0001419356 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 263,870

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: 0001209191-18-011752 · doc4.xml · nonDerivative · entry 1

Davies Christa · CIK 0001419356 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 284,766

F1 · kind: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the tenth 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 15, 2018, based on the Company's performance for the period from January 1, 2015 to December 31, 2017.

F1 · price: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the tenth 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 15, 2018, based on the Company's performance for the period from January 1, 2015 to December 31, 2017.

SEC source: 0001209191-18-011733 · doc4.xml · derivative · entry 9

Grace Caroline · CIK 0001705516 · CEO, Global Retirement & Inves

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,565

Underlying: Class A Ordinary Shares · 1,565 shares

Expires 2021-02-15

F5 · derivative.exercise_price: The restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with U.K. 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: 0001209191-18-011733 · doc4.xml · nonDerivative · entry 2

Grace Caroline · CIK 0001705516 · CEO, Global Retirement & Inves

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 52,264.87

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: 0001209191-18-011733 · doc4.xml · nonDerivative · entry 1

Grace Caroline · CIK 0001705516 · CEO, Global Retirement & Inves

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 55,914.87

F1 · kind: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the tenth 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 15, 2018, based on the Company's performance for the period from January 1, 2015 to December 31, 2017.

F1 · price: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the tenth 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 15, 2018, based on the Company's performance for the period from January 1, 2015 to December 31, 2017.

F2 · balance_after: Includes shares acquired under the Aon employee stock purchase plan on December 29, 2017.

SEC source: 0001209191-18-011725 · doc4.xml · derivative · entry 9

LIEB PETER M · CIK 0001263967 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,925

Underlying: Class A Ordinary Shares · 1,925 shares

Expires 2021-02-15

F4 · derivative.exercise_price: The restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with U.K. 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: 0001209191-18-011725 · doc4.xml · nonDerivative · entry 2

LIEB PETER M · CIK 0001263967 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,932.9

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: 0001209191-18-011725 · doc4.xml · nonDerivative · entry 1

LIEB PETER M · CIK 0001263967 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 42,699.9

F1 · kind: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the tenth 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 15, 2018, based on the Company's performance for the period from January 1, 2015 to December 31, 2017.

F1 · price: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the tenth 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 15, 2018, based on the Company's performance for the period from January 1, 2015 to December 31, 2017.

SEC source: 0001209191-18-011717 · doc4.xml · derivative · entry 5

Goland Anthony R · CIK 0001669783 · Chief Human Resources Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,900

Underlying: Class A Ordinary Shares · 1,900 shares

Expires 2021-02-15

F3 · derivative.exercise_price: The restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with U.K. 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: 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.

F4 · 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: 0001209191-18-011706 · doc4.xml · derivative · entry 9

Meissner Laurel G. · CIK 0001430384 · Global Controller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,118

Underlying: Class A Ordinary Shares · 1,118 shares

Expires 2021-02-15

F4 · derivative.exercise_price: The restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with U.K. 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: 0001209191-18-011706 · doc4.xml · nonDerivative · entry 2

Meissner Laurel G. · CIK 0001430384 · Global Controller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,271

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: 0001209191-18-011706 · doc4.xml · nonDerivative · entry 1

Meissner Laurel G. · CIK 0001430384 · Global Controller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,930

F1 · kind: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the tenth 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 15, 2018, based on the Company's performance for the period from January 1, 2015 to December 31, 2017.

F1 · price: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the tenth 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 15, 2018, based on the Company's performance for the period from January 1, 2015 to December 31, 2017.

SEC source: 0001209191-18-011693 · doc4.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 517,503

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: 0001209191-18-011693 · doc4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 717,945

F1 · kind: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the tenth 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 15, 2018, based on the Company's performance for the period from January 1, 2015 to December 31, 2017.

F1 · price: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the tenth 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 15, 2018, based on the Company's performance for the period from January 1, 2015 to December 31, 2017.

SEC source: 0001209191-18-011645 · doc4.xml · derivative · entry 9

BRUNO JOHN G · CIK 0001283118 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,112

Underlying: Class A Ordinary Shares · 2,112 shares

Expires 2021-02-15

F5 · derivative.exercise_price: The restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with U.K. 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: 0001209191-18-011645 · doc4.xml · nonDerivative · entry 2

BRUNO JOHN G · CIK 0001283118 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,312.65

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: 0001209191-18-011645 · doc4.xml · nonDerivative · entry 1

BRUNO JOHN G · CIK 0001283118 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 41,500.65

F1 · kind: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the tenth 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 15, 2018, based on the Company's performance for the period from January 1, 2015 to December 31, 2017.

F1 · price: Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the tenth 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 15, 2018, based on the Company's performance for the period from January 1, 2015 to December 31, 2017.

F2 · balance_after: Includes shares acquired under the Aon employee stock purchase plan on December 29, 2017.

SEC source: 0001209191-18-008463 · doc4.xml · nonDerivative · entry 2

KNIGHT LESTER B · CIK 0001023262 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Family Partnership

Disclosed balance after: 85,000

SEC source: 0001209191-18-008463 · doc4.xml · nonDerivative · entry 1

KNIGHT LESTER B · CIK 0001023262 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Trust

Disclosed balance after: 191,044

SEC source: 0001209191-18-007990 · doc4.xml · nonDerivative · entry 1

Zern John · CIK 0001705528 · CEO, Aon Global Health

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,948

F1 · kind: The transaction reported was effected pursuant to a trading plan entered into on November 30, 2017 meeting the requirements of Rule 10b5-1.

SEC source: 0001179110-18-001672 · edgar.xml · derivative · entry 3

O'Connor Michael J · CIK 0001506411 · Chief Executive Officer, ARS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Ordinary Shares · 12,824 shares

Expires 2018-02-28

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: The Transactions reported were effected pursuant to a trading plan entered into on November 22, 2017 meeting the requirements of SEC Rule 10b5-1.

F3 · price: Stock option granted pursuant to Aon Stock Incentive Plan.

F2 · derivative.exercise_date: The options became exercisable in three equal annual instalments. All options are exercisable.

SEC source: 0001179110-18-001672 · edgar.xml · nonDerivative · entry 2

O'Connor Michael J · CIK 0001506411 · Chief Executive Officer, ARS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 113,805

F1 · kind: The Transactions reported were effected pursuant to a trading plan entered into on November 22, 2017 meeting the requirements of SEC Rule 10b5-1.

SEC source: 0001179110-18-001672 · edgar.xml · nonDerivative · entry 1

O'Connor Michael J · CIK 0001506411 · Chief Executive Officer, ARS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 126,629

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: The Transactions reported were effected pursuant to a trading plan entered into on November 22, 2017 meeting the requirements of SEC Rule 10b5-1.

SEC source: 0001179110-18-001437 · edgar.xml · nonDerivative · entry 1

LIEB PETER M · CIK 0001263967 · EVP & General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,160.901

F1 · kind: The transaction reported was effected pursuant to a trading plan meeting the requirements of Rule 10b5-1.

F2 · balance_after: Includes shares acquired under the Aon employee stock purchase plan on June 30, 2017 and December 29, 2017.

SEC source: 0001179110-17-014844 · edgar.xml · nonDerivative · entry 1

Zern John · CIK 0001705528 · CEO, Global Health & Benefits

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,695

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 $139.68 to $140.06, 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: 0001179110-17-014842 · edgar.xml · nonDerivative · entry 1

Meissner Laurel G. · CIK 0001430384 · SVP & Global Controller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,314

SEC source: 0001179110-17-014587 · edgar.xml · derivative · entry 4

Grace Caroline · CIK 0001705516 · CEO, Global Retirement & Inves

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,581

Underlying: Class A Ordinary Shares · 527 shares

Expires 2020-11-20

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 stock unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with U.K. 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: A restricted share unit award was granted on November 20, 2015 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan as follows: 20% of the awards vest on each of the first through fifth anniversaries of the date of the grant.

F5 · derivative.expiration_date: A restricted share unit award was granted on November 20, 2015 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan as follows: 20% of the awards vest on each of the first through fifth anniversaries of the date of the grant.

SEC source: 0001179110-17-014587 · edgar.xml · nonDerivative · entry 3

Grace Caroline · CIK 0001705516 · CEO, Global Retirement & Inves

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 45,232.613

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

SEC source: 0001179110-17-014587 · edgar.xml · nonDerivative · entry 2

Grace Caroline · CIK 0001705516 · CEO, Global Retirement & Inves

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 45,480.613

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.

F2 · balance_after: The total number of shares reported in Column 5 includes shares acquired under the Aon employee stock purchase plan.

SEC source: 0001179110-17-014202 · edgar.xml · nonDerivative · entry 1

Andersen Eric · CIK 0001697695 · CEO, Aon Benfield

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 51,741.225

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 $143.51 to $143.55, 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: The total number of shares reported in Column 5 includes 1,771 shares that were inadvertently omitted from the Original Form 3 and subsequent reports. The Original Form 3 has been amended to reflect this correction.

F3 · balance_after: The total number of shares reported in Column 5 includes shares acquired in 2017 under the Aon employee stock purchase plan.

SEC source: 0001179110-17-014028 · edgar.xml · nonDerivative · entry 1

BRUNO JOHN G · CIK 0001283118 · Executive Vice President, CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,471.386

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 $143.15 to $143.35, 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: 0001179110-17-012566 · edgar.xml · derivative · entry 3

O'Connor Michael J · CIK 0001506411 · Chief Executive Officer, ARS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,824

Underlying: Class A Ordinary Shares · 10,000 shares

Expires 2018-02-28

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 · price: Stock option granted pursuant to Aon Stock Incentive Plan.

F2 · derivative.exercise_date: The options became exercisable in three equal annual instalments. All options are exercisable.

SEC source: 0001179110-17-012566 · edgar.xml · nonDerivative · entry 2

O'Connor Michael J · CIK 0001506411 · Chief Executive Officer, ARS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 113,805

F1 · kind: The transactions reported were effected pursuant to a trading plan meeting the requirements of SEC Rule 10b5-1.

SEC source: 0001179110-17-012566 · edgar.xml · nonDerivative · entry 1

O'Connor Michael J · CIK 0001506411 · Chief Executive Officer, ARS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 123,805

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: The transactions reported were effected pursuant to a trading plan meeting the requirements of SEC Rule 10b5-1.

SEC source: 0001179110-17-012278 · edgar.xml · derivative · entry 3

BRUNO JOHN G · CIK 0001283118 · Executive Vice President, CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,264

Underlying: Class A Ordinary Sahres · 12,632 shares

Expires 2019-09-12

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 stock unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with U.K. 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: A restricted share unit award was granted on September 12, 2014 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan as follows: 20% of the awards vest on each of the first through fifth anniversaries of the date of the grant.

F5 · derivative.expiration_date: A restricted share unit award was granted on September 12, 2014 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan as follows: 20% of the awards vest on each of the first through fifth anniversaries of the date of the grant.

SEC source: 0001179110-17-012278 · edgar.xml · nonDerivative · entry 2

BRUNO JOHN G · CIK 0001283118 · Executive Vice President, CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,471.386

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