Insider txns (12m)
25
Stock / equity
AON Aon plc
- Company
- Aon plc
- Security
- Equity
- Size, estimated from filings
- Large cap ($10B – $200B)
- Insiders on record
- 7
- Members of Congress
- 1
- Latest trade on record
- September 2, 2026
AON (Aon plc) has 25 disclosed insider transactions from 7 insiders in the last 12 months (6 open-market buys, 12 sales, about $9.3M at reported prices) and 1 congressional trade from 1 member of Congress. The most recent disclosure was filed September 3, 2026.
Open-market buys / sales
6 / 12
Congress trades (12m)
1
Distinct filers (12m)
8
Share price
Price and chart by TradingView for Aon plc. US share prices here are delayed, not real-time. The trade records on this page come from government filings, not from this chart.
AON in charts
Who is trading this stock
Which people account for the buying and selling over the last 12 months?
BoughtSold
8 people account for the disclosed buying and selling in AON over the last 12 months; the most active is KNIGHT LESTER B with $6.5M.
Prices insiders traded at
What price did insiders buy and sell at? Each marker is one open-market trade at the share price reported on its Form 4.
▲ Bought▼ SoldAverage reported price that day
Insiders reported 13 open-market trades in AON since Jul 7, 2026, at prices from $326 to $380; the most recent was a purchase at $326 on Sep 2, 2026. These are the prices on the filings, not adjusted for stock splits, and not a market price series.
Insider holdings over time
Is an insider building or unwinding a position? Shares held directly after each filing.
Zeidel DarrenKNIGHT LESTER B
Zeidel Darren reported 11,504 shares held after the latest filing, against 15,354 at the first on record.
Lobbying spend by quarter
How much has Aon plc reported spending on federal lobbying?
Aon plc reported $940K in lobbying over the last eight quarters, from filings matched by exact company name.
Insiders trading AON
Everyone who filed a Form 4 for this ticker, by number of rows on record. "Bought" and "sold" count open-market purchases (code P) and sales only; awards, option exercises and shares withheld for tax are in the row count but not in those two columns.
| Insider | Role | Rows | Bought | Sold | Value bought | Value sold | Latest |
|---|---|---|---|---|---|---|---|
| KNIGHT LESTER B | Director | 7 | 6 | 0 | $6.5M | — | September 2, 2026 |
| Zeidel Darren | General Counsel | 7 | 0 | 7 | — | $1.7M | July 28, 2026 |
| Reese Edmund | Chief Financial Officer | 3 | 0 | 1 | — | $755K | July 1, 2026 |
| Alvarez Jose Antonio | Director | 2 | 0 | 1 | — | $118K | June 25, 2026 |
| FRANCIS CHERYL A | Director | 2 | 0 | 1 | — | $59K | June 25, 2026 |
| NOTEBAERT RICHARD C | Director | 2 | 0 | 1 | — | $59K | June 25, 2026 |
| STAVRIDIS JAMES G. | Director | 2 | 0 | 1 | — | $59K | June 25, 2026 |
What kind of transactions these are 5 Form 4 codes
| Code | Meaning | Rows | Shares | Value at reported prices |
|---|---|---|---|---|
| S | Open-market sale | 7 | 4,450 | $1.7M |
| P | Open-market purchase | 6 | 20,000 | $6.5M |
| A | Grant or award | 5 | 4,592 | — |
| F | Shares withheld for tax | 5 | 3,129 | $1.0M |
| M | Option exercise or conversion | 2 | 7,950 | — |
What each code means: Form 4 transaction codes.
Members of Congress trading AON
Members whose periodic transaction reports name this ticker. Amounts are the sums of the ranges as filed.
| Member | Seat | Trades | Bought | Sold | Range as filed | Latest |
|---|---|---|---|---|---|---|
| Alan Armstrong | Senator (OK), Republican | 1 | 1 | 0 | $1,001–$15K | March 27, 2026 |
Insider transactions
| Filer | Side | Trade date | Disclosed | Lag | Shares | Price | Value | Flags | Source | Share |
|---|---|---|---|---|---|---|---|---|---|---|
| KNIGHT LESTER B | Buy P | September 2, 2026 | September 3, 2026 | 1d | 367 | $331 | $121K | indirect | Form 4 ↗ | |
| KNIGHT LESTER B | Buy P | September 2, 2026 | September 3, 2026 | 1d | 1,440 | $330 | $475K | indirect | Form 4 ↗ | |
| KNIGHT LESTER B | Buy P | September 2, 2026 | September 3, 2026 | 1d | 4,145 | $328 | $1.4M | indirect | Form 4 ↗ | |
| KNIGHT LESTER B | Buy P | September 2, 2026 | September 3, 2026 | 1d | 7,212 | $328 | $2.4M | indirect | Form 4 ↗ | |
| KNIGHT LESTER B | Buy P | September 2, 2026 | September 3, 2026 | 1d | 5,097 | $327 | $1.7M | indirect | Form 4 ↗ | |
| KNIGHT LESTER B | Buy P | September 2, 2026 | September 3, 2026 | 1d | 1,739 | $326 | $566K | indirect | Form 4 ↗ | |
| Zeidel Darren | Sell S | July 28, 2026 | July 30, 2026 | 2d | 475 | $380 | $181K | 10b5-1 plan | Form 4 ↗ | |
| Zeidel Darren | Sell S | July 28, 2026 | July 30, 2026 | 2d | 725 | $378 | $274K | 10b5-1 plan | Form 4 ↗ | |
| Zeidel Darren | Sell S | July 28, 2026 | July 30, 2026 | 2d | 700 | $376 | $263K | 10b5-1 plan | Form 4 ↗ | |
| Zeidel Darren | Sell S | July 17, 2026 | July 21, 2026 | 4d | 675 | $374 | $252K | 10b5-1 plan | Form 4 ↗ | |
| Zeidel Darren | Sell S | July 17, 2026 | July 21, 2026 | 4d | 650 | $372 | $242K | 10b5-1 plan | Form 4 ↗ | |
| Zeidel Darren | Sell S | July 17, 2026 | July 21, 2026 | 4d | 625 | $370 | $231K | 10b5-1 plan | Form 4 ↗ | |
| Zeidel Darren | Sell S | July 7, 2026 | July 9, 2026 | 2d | 600 | $360 | $216K | 10b5-1 plan | Form 4 ↗ | |
| Reese Edmund | Option / conversion M | July 1, 2026 | July 6, 2026 | 5d | 3,975 | — | — | latederivative | Form 4 ↗ | |
| Reese Edmund | Sell F | July 1, 2026 | July 6, 2026 | 5d | 2,198 | $344 | $755K | late | Form 4 ↗ | |
| Reese Edmund | Option / conversion M | July 1, 2026 | July 6, 2026 | 5d | 3,975 | — | — | late | Form 4 ↗ | |
| NOTEBAERT RICHARD C | Sell F | June 25, 2026 | June 29, 2026 | 4d | 186 | $316 | $59K | Form 4 ↗ | ||
| NOTEBAERT RICHARD C | Other A | June 25, 2026 | June 29, 2026 | 4d | 776 | — | — | Form 4 ↗ | ||
| STAVRIDIS JAMES G. | Sell F | June 25, 2026 | June 29, 2026 | 4d | 186 | $316 | $59K | Form 4 ↗ | ||
| STAVRIDIS JAMES G. | Other A | June 25, 2026 | June 29, 2026 | 4d | 776 | — | — | Form 4 ↗ | ||
| FRANCIS CHERYL A | Sell F | June 25, 2026 | June 29, 2026 | 4d | 186 | $316 | $59K | Form 4 ↗ | ||
| FRANCIS CHERYL A | Other A | June 25, 2026 | June 29, 2026 | 4d | 776 | — | — | Form 4 ↗ | ||
| Alvarez Jose Antonio | Sell F | June 25, 2026 | June 29, 2026 | 4d | 372 | $316 | $118K | Form 4 ↗ | ||
| Alvarez Jose Antonio | Other A | June 25, 2026 | June 29, 2026 | 4d | 776 | — | — | Form 4 ↗ | ||
| KNIGHT LESTER B | Other A | June 25, 2026 | June 29, 2026 | 4d | 1,488 | — | — | Form 4 ↗ |
Congressional trades
| Filer | Side | Trade date | Disclosed | Lag | Shares | Price | Value | Flags | Source | Share |
|---|---|---|---|---|---|---|---|---|---|---|
| Alan Armstrong | Buy | March 27, 2026 | July 21, 2026 | 116d | — | — | $1,001–$15K | late | Senate PTR ↗ |
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Guides for this page
- What is SEC Form 4? Who files: officers, directors and owners of more than 10% of a class of the company's shares.
- Form 4 transaction codes P = purchase. S = sale. These are the two market trades.
- Insider buying vs insider selling Selling outweighs buying by a wide margin in normal times.
- How to read a congressional trade report Owner tells you whose asset it was: the member, the spouse, a dependent child, or held jointly.
- Why congressional trade amounts are ranges There are ten ranges; the lowest is $1,001–$15,000 and the highest is over $50,000,000.
Sources and method
| Source | Filings | Rows | First filed | Newest filed | Read the originals |
|---|---|---|---|---|---|
| Senate eFD, periodic transaction reports | 1 | 1 | July 21, 2026 | July 21, 2026 | Senate eFD search |
| SEC EDGAR, Form 4 | 10 | 25 | June 29, 2026 | September 3, 2026 | Form 4 list on EDGAR |
Site built October 22, 2026. Every row in the tables above links to its own filing. To quote a figure, use the Cite button at the top of the page; see how to cite and reuse.
Insider rows are Form 4 filings for this issuer from SEC EDGAR; congressional rows are periodic transaction reports parsed from the House Clerk and the Senate eFD. Values use the reported price for Form 4 and the disclosed range for Congress. See methodology and corrections.
Not investment advice. Disclosures are shown as filed and may lag the trade or be amended. No recommendation is made or implied.