Notice of Proposed Sale · 144

Aon plc

AONNYSEEQUITYCurrent

Notice of Proposed Sale

Filed Jul 7, 2026Accepted Jul 7, 2026, 11:15 AM EDTFiling CIK 315293Accession 0001959173-26-005134

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Structured filing — 144

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Notice of proposed sale. The proposed amounts below do not establish that a sale occurred.

Proposed-sale notice

Issuer: Aon plc
Issuer CIK: 0000315293
SEC file number: 001-07933
Phone: 35312666000
Person for whose account securities are to be sold: Zeidel Darren
Relationships to issuer: Officer
Street: 15 GEORGES QUAY
City: DUBLIN 2
State / country code: L2
Postal code: D02 VR98

Securities proposed for sale

Securities proposed for sale · 1 reported row
Security	Proposed units	Aggregate market value	Units outstanding	Approximate sale date	Exchange	Broker / market maker
Class A	600	216,000.00	213,576,949	07/07/2026	NYSE	Fidelity Brokerage Services LLC

Broker / market maker — proposed row 1, entry 1

Name: Fidelity Brokerage Services LLC
Street: 900 Salem Street
City: Smithfield
State / country code: RI
Postal code: 02917

Acquisition of securities to be sold

Acquisition of securities to be sold · 1 reported row
Security	Acquired	Nature of acquisition	Acquired from	Amount acquired	Gift transaction	Payment date	Nature of payment
Class A	02/13/2025	Restricted Stock Vesting	Issuer	600	N	02/13/2025	Compensation

Prior-sale reporting

Nothing to report for the preceding three months: Y

Notice signature

Notice date: 07/07/2026
Signed: /s/Wade Moss, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Darren E. Zeidel
Plan adoption dates: 11/05/2025

Company context

Aon plc (NYSE: AON) exists to shape decisions for the better - to protect and enrich the lives of people around the world. Through actionable analytic insight, globally integrated Risk Capital and Human Capital expertise, and locally relevant solutions, our colleagues provide clients in over 120 countries with the clarity and confidence to make better risk and people decisions that protect and grow their businesses.

Current securities

AONNYSE · EQUITY · Current

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