AON offering history
Every offering-related filing in Aon plc’s recent SEC record — registrations (announced capacity) kept separate from pricing documents (executed sales). Reviewed 1,000 filings back to Oct 3, 2014.
| Date | Filing | What it means | |
|---|---|---|---|
| Sep 15, 2026 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Sep 14, 2026 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Sep 11, 2026 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Jul 2, 2026 | S-3ASR → | REGISTERED | Automatic shelf registration — effective immediately (large filers) |
| Apr 23, 2024 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Apr 23, 2024 | EFFECT → | EFFECTIVE | SEC declared a registration effective — selling can begin |
| Feb 29, 2024 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Feb 29, 2024 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Feb 27, 2024 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Jun 22, 2023 | S-3ASR → | REGISTERED | Automatic shelf registration — effective immediately (large filers) |
| Feb 24, 2023 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Feb 23, 2023 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Feb 23, 2023 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Sep 8, 2022 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Sep 7, 2022 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Sep 7, 2022 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Feb 25, 2022 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Feb 23, 2022 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Feb 23, 2022 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Dec 1, 2021 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Nov 29, 2021 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Nov 29, 2021 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Aug 20, 2021 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Aug 18, 2021 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Aug 18, 2021 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| May 13, 2020 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| May 12, 2020 | S-3ASR → | REGISTERED | Automatic shelf registration — effective immediately (large filers) |
| May 12, 2020 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| May 12, 2020 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Nov 14, 2019 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Nov 13, 2019 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Nov 13, 2019 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| May 2, 2019 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Apr 30, 2019 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Apr 30, 2019 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Nov 30, 2018 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Nov 29, 2018 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Nov 29, 2018 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Sep 25, 2018 | S-3ASR → | REGISTERED | Automatic shelf registration — effective immediately (large filers) |
| Feb 25, 2016 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
Two honest limits. (1) A 424B takedown can price shares or notes — EDGAR’s metadata doesn’t say which, so open the document: large investment-grade filers use these mostly for bond deals (no dilution), small-caps mostly for shares. (2) At-the-market (ATM) programs sell shares gradually and individual sales are not separately filed — the visible footprint is the enabling shelf and its 424B5; actual ATM share counts surface later in the 10-Q/10-K share count. Educational information from public filings, not investment advice.
AON offering FAQ
When did AON last execute an offering?
Per SEC filings, Aon plc's most recent priced offering document is a 424B5 filed 2026-09-15. Note a 424B takedown can price shares or notes (debt) — the linked document says which.
When did AON last announce or register an offering?
The most recent registration is a S-3ASR filed 2026-07-02. A registration is capacity to sell shares — not a sale.
Does an offering always mean dilution?
Registered direct offerings and shelf takedowns issue new shares and dilute existing holders. Resale registrations (424B3/B7) let existing holders sell and do not create new shares. Secondary sales by insiders also do not dilute. Each row here is labeled with what it is.
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