AON PLC (AON) insider trading
Recent insider transactions reported to the SEC on Form 4 — directors and officers buying or selling their own company’s stock. Sourced directly from public SEC filings, latest filed Sep 3, 2026.
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- Filings shown
- 11
- Open-market buys
- 6
- Open-market sells
- 7
Counts cover the 11 most recent Form 4 filings Tradune holds for AON (filed Jun 29 – Sep 3, 2026); the score below covers only the trailing 90 days (6 buys, 3 sells). No completed check of AON's Form 4 list on SEC EDGAR is on record yet; the latest AON filing Tradune holds was filed Sep 3, 2026. This is not guaranteed to be the complete record — see AON's full Form 4 filing history on SEC EDGAR.
Open-market activity, last 90 days
Purchases (Form 4 code P) and sales (code S) on the 2 filings Tradune holds for AON filed Jul 30 – Sep 3, 2026. Grants, exercises, tax withholding and the other Form 4 transaction codes are left out.
3 open-market sales by Rule 10b5-1 checkbox
- On filings with the 10b5-1 box checked
- 0 sales· 0 sh
- checkbox disclosed
- On filings with the box not checked
- 0 sales· 0 sh
- not proof that no plan exists
- Not comparable
- 3 sales· 1,900 sh
- filed before Apr 1, 2023, or no checkbox value in the filing data
Counts are Form 4 lines as filed. The checkbox is one per filing, so every sale on a filing with the box checked is counted there even if only some of its transactions were under a plan; it records what the filer disclosed, and the three categories are not a judgement about why a sale was made.
| Insider | Buys | Sells | Shares bought | Shares sold | Value |
|---|---|---|---|---|---|
| Lester B. KnightDirector | 6 | 0 | 20,000 | — | +$6,549,688 |
| Darren ZeidelGeneral Counsel | 0 | 3 | — | 1,900 | −$717,750 |
Value = shares × the price reported on each Form 4 (+ purchases, − sales); every open-market line in this window disclosed a price.
Summarises ~90 days of public SEC Form 4 activity — more distinct buyers, officer involvement and net buying score higher. A description of filing activity, not a rating or buy signal. How this score is computed →
Weekly signal history
AON appeared in 4 archived weekly editions as a top net buyer. These are frozen weekly snapshots, not a complete filing history.
- Week of Sep 16, 2026 6 open-market buys · $4,890,438 net
- Week of Sep 9, 2026 6 open-market buys · $4,890,438 net
- Week of Sep 7, 2026 6 open-market buys · $4,890,438 net
- Week of Sep 4, 2026 6 open-market buys · $4,890,438 net
An entry means this company met that edition’s displayed cluster or top-buyer threshold. Missing weeks do not mean no insider transaction occurred. All figures are derived from SEC Form 4 filings; open-market buys minus sales are shown as net only when every transaction value was disclosed.
How to read this: an open-market purchase (Form 4 code P) is a buy at the market price with the insider’s own money, as opposed to a grant, award or option exercise; an open-market sale is code S. When two or more distinct insiders report open-market purchases in the same 90-day window, this site labels that a cluster — a definition, not a forecast; see insider cluster buying. “Held after” is Form 4 Table I column 5; “Change” = shares ÷ holdings before the trade (held after − shares for an acquisition, held after + shares for a disposition).
Insider Buying at AON
Insiders reported 6 open-market purchases of AON between Jun 29, 2026 and Sep 3, 2026, across 1 distinct buyer. The most recent purchase was reported by Lester B. Knight (Director) on Sep 2, 2026. Grants, option exercises, and tax-withholding transactions are excluded from these counts.
Recent Form 4 filings
Source: SEC EDGAR Form 4 · transaction codes explained
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market purchase | 367 | $330.51 | — | — | Sep 2, 2026 |
| Open-market purchase | 4,145 | $328.34 | — | — | Sep 2, 2026 |
| Open-market purchase | 7,212 | $327.52 | — | — | Sep 2, 2026 |
| Open-market purchase | 5,097 | $326.53 | — | — | Sep 2, 2026 |
| Open-market purchase | 1,739 | $325.63 | — | — | Sep 2, 2026 |
| Open-market purchase | 1,440 | $329.69 | — | — | Sep 2, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale | 475 | $380.00 | — | — | Jul 28, 2026 |
| Open-market sale | 725 | $378.00 | — | — | Jul 28, 2026 |
| Open-market sale | 700 | $376.00 | — | — | Jul 28, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale | 625 | $370.00 | — | — | Jul 17, 2026 |
| Open-market sale | 650 | $372.00 | — | — | Jul 17, 2026 |
| Open-market sale | 675 | $374.00 | — | — | Jul 17, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale | 600 | $360.00 | — | — | Jul 7, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Tax withholding | 2,198 | $343.56 | — | — | Jul 1, 2026 |
| Option exercise | 3,975 | — | — | — | Jul 1, 2026 |
| Option exercise Restricted Share Unit (Right to Receive) | 3,975 | — | — | — | Jul 1, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Grant / award | 1,488 | — | — | — | Jun 25, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Tax withholding | 372 | $315.95 | — | — | Jun 25, 2026 |
| Grant / award | 776 | — | — | — | Jun 25, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Tax withholding | 186 | $315.95 | — | — | Jun 25, 2026 |
| Grant / award | 776 | — | — | — | Jun 25, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Tax withholding | 186 | $315.95 | — | — | Jun 25, 2026 |
| Grant / award | 776 | — | — | — | Jun 25, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Tax withholding | 186 | $315.95 | — | — | Jun 25, 2026 |
| Grant / award | 776 | — | — | — | Jun 25, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Tax withholding | 186 | $315.95 | — | — | Jun 25, 2026 |
| Grant / award | 776 | — | — | — | Jun 25, 2026 |
Insider filings reported around the same time
Other companies whose most recent Form 4 was filed closest to AON's (Sep 3, 2026).
Frequently asked about AON insider activity
How many insiders bought AON stock in these Form 4 filings?
1 distinct insider at AON PLC reported 6 open-market purchases (Form 4 code P) of AON shares between Jun 29, 2026 and Sep 3, 2026, the most recent filed by Lester B. Knight (Director) on Sep 2, 2026. Grants, option exercises, and tax-withholding transactions are excluded from these counts.
Who filed the most recent Form 4 for AON?
The most recent Form 4 on this page was filed by Lester B. Knight (Director) on Sep 3, 2026, reporting 6 transactions. The original document is linked from the filing list above on SEC EDGAR. Amended filings (Form 4/A) may later revise reported figures.
What was the largest open-market AON insider purchase shown?
The largest open-market purchase among the filings shown was 7,212 AON shares at $327.52 (about $2,362,074) by Lester B. Knight (Director) on Sep 2, 2026. Value is shares × the price reported on the Form 4; trades may be made under a prearranged Rule 10b5-1 plan.
New to Form 4s? The transaction codes, the 90-day window and the 0–100 score are defined on the insider-activity score methodology page.
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Track AON insider filings free →This score summarizes SEC Form 4 filing activity over the trailing 90 days. It is descriptive, not predictive — not a rating, recommendation, or investment advice. Data: SEC EDGAR (public domain), as filed; amendments may revise figures. Tradune is not a registered investment adviser.
Data as filed; amended filings (Form 4/A) may revise figures. Sales may occur under prearranged Rule 10b5-1 trading plans.