Form 8.3 - Aon plc

1.

KEY INFORMATION

Name of person dealing

Wellington Management Group LLP

Company dealt in

Aon PLC

Class of relevant security to which the

dealings being disclosed relate

Common Stock (IE00BLP1HW54)

Date of dealing

15 July 2021

2.

INTERESTS AND SHORT POSITIONS

(a)

Interests and short positions (following dealing) in the class of relevant security

dealt in

Long

Short

Number

(%)

Number

(%)

(1)

Relevant securities

2,346,669 shares

1.04 %

-23,334 shares

-0.01 %

(2)

Derivatives (other than options):

-12,314 shares

-0.01 %

(3)

Options and agreements to purchase/sell:

Total

2,346,669 shares

1.04 %

-35,648 shares

-0.02 %

(b)

Interests and short positions in relevant securities of the company, other than the

class dealt in

Class of relevant security:

Long

Short

Number

(%)

Number

(%)

(1)

Relevant securities

(2)

Derivatives (other than options):

(3)

Options and agreements to purchase/sell:

Total

3.

DEALINGS

(a)

Purchases and sales

Purchase/sale

Number of relevant securities

Price per unit

Sale

69 shares

231.2600 USD

(b)

Derivatives transactions (other than options transactions)

Product name

e.g. CFD

Nature of transaction

Number of relevant securities

Price per unit

(c)

Options transactions in respect of existing relevant securities

(i)

Writing, selling, purchasing or varying

Product name e.g. call option

Writing, purchasing, selling, varying etc.

Number of securities to which the option relates

Exercise price

Type, e.g. American, European etc.

Expiry date

Option money paid/ received per unit

(ii)

Exercising

Product name

e.g. call option

Number of securities

Exercise price per unit

(d)

Other dealings (including subscribing for new securities)

Nature of transaction

Details

Price per unit (if applicable)

4.

OTHER INFORMATION

Agreements, arrangements or understandings relating to options or derivatives

Full details of any agreement, arrangement or understanding between the person disclosing and any other person relating to the voting rights of any relevant securities under any option referred to on this form or relating to the voting rights or future acquisition or disposal of any relevant securities to which any derivative referred to on this form is referenced. If none, this should be stated.

None

Is a Supplemental Form 8 attached?

YES

Date of disclosure

16 July 2021

Contact name

Sophie Gray

Telephone number

44-20-7126-6069

If a connected EFM, name of offeree/offeror with which connected

If a connected EFM, state nature of connection

OPEN POSITIONS

Product name, e.g. call option

Written or purchased

Number of relevant securities to which option or derivative relates

Exercise price

Type e.g. American, European etc.

Expiry date

Equity Swap

Written

141 shares

22 May 23

Equity Swap

Written

254 shares

22 May 23

Equity Swap

Written

322 shares

22 May 23

Equity Swap

Written

573 shares

22 May 23

Equity Swap

Written

3,025 shares

22 May 23

Equity Swap

Written

7,999 shares

22 May 23