Darren Zeidel - May 19, 2021 Form 4 Insider Report for Aon plc (AON)

Role: General Counsel
Signature: /s/ Julie Cho- Julie Cho pursuant to a power of attorney from Darren Zeidel
Stock symbol: AON
Transactions as of: May 19, 2021
Transactions value $: -$39,047
Form type: 4
Date filed: 5/21/2021, 04:08 PM
Next filing: May 25, 2021

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	AON	Class A Ordinary Stock	Options Exercise		+157	+1.29%		12.4K	May 19, 2021	Direct	F1
transaction	AON	Class A Ordinary Stock	Tax liability	-$17.7K	-70	-0.57%	$252.23	12.3K	May 19, 2021	Direct	F2
transaction	AON	Class A Ordinary Stock	Options Exercise		+189	+1.54%		12.5K	May 20, 2021	Direct	F1
transaction	AON	Class A Ordinary Stock	Tax liability	-$21.4K	-84	-0.67%	$254.65	12.4K	May 20, 2021	Direct	F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	AON	Restrictive Share Unit (Right to Receive)	Options Exercise	$0	-157	-50%	$0.00	157	May 19, 2021	Class A Ordinary Shares	157		Direct	F3, F4
transaction	AON	Restrictive Share Unit (Right to Receive)	Options Exercise	$0	-189	-100%	$0.00^*	0	May 20, 2021	Class A Ordinary Shares	189		Direct	F3, F5

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Class A Ordinary Shares acquired upon the vesting of a restricted share unit award.
F2	Class A Ordinary Shares withheld by the issuer for the payment of withholding taxes in connection with the vesting of a restricted shares unit.
F3	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	A restricted share unit award was granted on May 19, 2017 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.
F5	A restricted share unit award was granted on May 20, 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 grant.