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 Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)
6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount 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
Director 10% Owner Officer Other
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 Slyfield 12/10/2021
**Signature of Reporting Person Date
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