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AON 424B5: Secondary offering

Filed with the SEC on · accession 0001193125-26-388712

AON filed a 424B5 (prospectus (offering)) with the SEC on Sep 11, 2026. The final terms of an offering of shares or bonds. The stock moved -1.7% by the first close after the filing.

Summary of the filing

Aon North America, Inc. and Aon Global Holdings plc are offering multiple series of senior notes due 2029-2056, guaranteed by Aon plc and others, with proceeds intended for general corporate purposes including financing the USI Acquisition.

For details, click here →How to read a 424B5 →

Key details

aggregate principal amount of senior notes offered$0
GuarantorAon plc
IssuerAon North America, Inc.
IssuerAon Global Holdings plc
GuarantorAon Corporation
GuarantorAon Global Limited

How AON stock reacted

Close before

$307.77

Sep 10, 2026

First close after

-1.65%

$302.69

5 trading days

-3.81%

$296.05

Since filing

+8.79%

$334.81

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Frequently asked questions

What did AON file with the SEC on Sep 11, 2026?

AON filed a 424B5 (Secondary offering). Aon North America, Inc. and Aon Global Holdings plc are offering multiple series of senior notes due 2029-2056, guaranteed by Aon plc and others, with proceeds intended for general corporate purposes including financing the USI Acquisition.

What does a secondary offering mean for AON stock?

New shares dilute existing holders and are often sold at a discount to the market price.

How do I read a 424B5?

The final terms of an offering of shares or bonds. Look at price, number of shares and the discount to the market price. Large offerings dilute existing shareholders.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A 424B5 (prospectus (offering)): The final terms of an offering of shares or bonds.

How did AON stock react to this filing?

AON closed at $307.77 before the filing and $302.69 on Sep 11, 2026 (-1.65%). Five trading days later: $296.05 (-3.81%).

Other AON SEC filings

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