FORM 3
        
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Slyfield Jillian
2. Date of Event Requiring Statement (MM/DD/YYYY)
12/1/2021 

3. Issuer Name and Ticker or Trading Symbol

Aon plc [AON]
(Last)        (First)        (Middle)

200 E. RANDOLPH ST.
4. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                          _____ 10% Owner
___X___ Officer (give title below)        _____ Other (specify below)
Chief Innovation Officer /
(Street)

CHICAGO, IL 60601      

(City)              (State)              (Zip)
5. If Amendment, Date Original Filed(MM/DD/YYYY)
 

6. Individual or Joint/Group Filing(Check Applicable Line)

_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)
2. Amount of Securities Beneficially Owned
(Instr. 4)
3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)
4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Class A Ordinary Stock 304.492 D  

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 4)
2. Date Exercisable and Expiration Date
(MM/DD/YYYY)
3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)
4. Conversion or Exercise Price of Derivative Security5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)
6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date ExercisableExpiration DateTitleAmount or Number of Shares
Restricted Share Unit (Right to Receive)  (1)3/15/2022 Class A Ordinary Shares 141  (2)D  
Employee Stock Option (Right to Buy) 9/24/2021 (3)9/23/2028 Class A Ordinary Shares 20 $299.17 D  
Restricted Share Unit (Right to Receive)  (4)5/21/2023 Class A Ordinary Shares 210  (2)D  
Restricted Share Unit (Right to Receive)  (5)2/22/2024 Class A Ordinary Shares 696  (2)D  
Restricted Share Unit (Right to Receive)  (6)3/13/2023 Class A Ordinary Shares 231  (2)D  
Restricted Share Unit (Right to Receive)  (7)5/21/2025 Class A Ordinary Shares 207  (2)D  
Restricted Share Unit (Right to Receive)  (8)3/15/2024 Class A Ordinary Shares 327  (2)D  
Restricted Share Unit (Right to Receive)  (9)5/21/2026 Class A Ordinary Shares 197  (2)D  
Restricted Share Unit (Right to Receive)  (10)9/17/2024 Class A Ordinary Shares 277  (2)D  

Explanation of Responses:
(1) A restricted share unit award was granted on March 15, 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.
(2) 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.
(3) The options became exercisable on the grant date. All options are exercisable.
(4) A restricted share unit award was granted on May 21, 2018 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 grant.
(5) A restricted share unit award was granted on February 22, 2019 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 grant.
(6) A restricted share unit award was granted on March 13, 2020 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.
(7) A restricted share unit award was granted on May 21, 2020 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 grant.
(8) A restricted share unit award was granted on March 15, 2021 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.
(9) A restricted share unit award was granted on May 21, 2021 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 grant.
(10) A restricted share unit award was granted on September 17, 2021 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.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
Slyfield Jillian
200 E. RANDOLPH ST.
CHICAGO, IL 60601


Chief Innovation Officer

Signatures
/s/ Julie Cho - Julie Cho pursuant to a power of attorney from Jillian Slyfield12/10/2021
**Signature of Reporting PersonDate

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