AON insider buying – Aon plc
15 insider purchases since 2016 worth $57.8M by 4 different insiders. Last 12 months: 2 purchases, $7.8M. Most recent filing: 2026-09-03.
Large company Public float $77.0B (latest 10-K, SEC).
Same time range as the chart above - each mark sits under the week of the trade. Circles = purchases (height = price paid, size = amount), red triangles = open-market sales of $50k+. Prices as reported, not adjusted for later stock splits. 5 older purchases (before the 5-year window) are listed in the table below.
Purchases are open-market buys (SEC Form 4, code "P") - insiders paying with their own money. Sales are open-market sales (code "S") of $50,000 or more; many sales are pre-planned (Rule 10b5-1) or made for taxes and diversification. Each row links to the original filing.
Bought, sold, still holding?
| Insider | Bought | First / last buy | Sold since 2016 | Holds now* | Status |
|---|---|---|---|---|---|
| KNIGHT LESTER B Director | $56.2M 9× · 248,000 sh | 2018-02-06 2026-09-02 | – | 318,864 shares as of 2026-09-03 | Holds - never sold |
| CAMPBELL JEFFREY C Director | $798,312 1× · 5,550 sh | 2018-08-06 2018-08-06 | – | 12,621 shares as of 2026-06-29 | Holds - never sold |
| Spruell Byron Director | $682,174 4× · 2,125 sh | 2021-11-23 2024-08-28 | – | 6,563 shares as of 2026-06-29 | Holds - never sold |
| BRUNO JOHN G Officer | $186,460 1× · 1,000 sh | 2020-11-06 2020-11-06 | 2× · $2.9M last 2019-08-29 | 82,993 shares as of 2021-02-16 | Holds (sold earlier) |
* Shares held after the insider's most recent SEC filing for this company (all share classes, direct and indirect). If an insider stops filing, later changes are not known.
Insider buying and selling by year
| Year | Purchases | Bought | Buyers | Sales | Sold |
|---|---|---|---|---|---|
| 2026 | 2 | $7.8M | 1 | 5 | $4.7M |
| 2025 | 0 | – | – | 1 | $3.0M |
| 2024 | 3 | $18.1M | 2 | 11 | $28.4M |
| 2023 | 1 | $259,664 | 1 | 4 | $25.2M |
| 2022 | 2 | $4.1M | 2 | 7 | $12.5M |
| 2021 | 2 | $2.7M | 2 | 4 | $14.3M |
| 2020 | 3 | $15.7M | 2 | 9 | $19.5M |
| 2019 | 0 | – | – | 12 | $24.7M |
| 2018 | 2 | $9.1M | 2 | 17 | $26.4M |
| 2017 | 0 | – | – | 14 | $91.8M |
| 2016 | 0 | – | – | 8 | $19.6M |
Insider purchases
| Filed | Insider | Role | Shares | Avg price | Value | Holdings | Filing |
|---|---|---|---|---|---|---|---|
| 2026-09-03 | KNIGHT LESTER B | Director | 20,000 | $327.48 | $6.5M | +14.0% | SEC |
| 2026-02-12 | KNIGHT LESTER B | Director | 4,000 | $319.24 | $1.3M | +2.9% | SEC |
| 2024-08-29 | Spruell Byron | Director | 725 | $340.08 | $246,558 | +15.8% | SEC |
| 2024-05-07 | KNIGHT LESTER B | Director | 10,000 | $276.61 | $2.8M | +7.8% | SEC |
| 2024-02-09 | KNIGHT LESTER B | Director | 50,000 | $301.97 | $15.1M | +59.5% | SEC |
| 2023-08-24 | Spruell Byron | Director | 800 | $324.58 | $259,664 | +25.0% | SEC |
| 2022-08-25 | Spruell Byron | Director | 400 | $291.72 | $116,688 | +17.1% | SEC |
| 2022-05-09 | KNIGHT LESTER B | Director | 14,000 | $286.58 | $4.0M | +14.7% | SEC |
| 2021-11-24 | Spruell Byron | Director | 200 | $296.32 | $59,264 | +14.6% | SEC |
| 2021-08-09 | KNIGHT LESTER B | Director | 10,000 | $263.96 | $2.6M | +10.5% | SEC |
| 2020-11-10 | BRUNO JOHN G | Officer | 1,000 | $186.46 | $186,460 | +1.5% | SEC |
| 2020-11-09 | KNIGHT LESTER B | Director | 10,000 | $186.55 | $1.9M | SEC | |
| 2020-05-15 | KNIGHT LESTER B | Director | 70,000 | $195.00 | $13.7M | +233.3% | SEC |
| 2018-08-08 | CAMPBELL JEFFREY C | Director | 5,550 | $143.84 | $798,312 | +361.8% | SEC |
| 2018-02-08 | KNIGHT LESTER B | Director | 60,000 | $138.42 | $8.3M | +45.8% | SEC |
Insider sales
| Filed | Insider | Role | Shares | Avg price | Value | Type | Filing |
|---|---|---|---|---|---|---|---|
| 2026-07-30 | Zeidel Darren | Officer | 1,900 | $377.76 | $717,750 | Sale | SEC |
| 2026-07-21 | Zeidel Darren | Officer | 1,950 | $372.05 | $725,500 | Sale | SEC |
| 2026-07-09 | Zeidel Darren | Officer | 600 | $360.00 | $216,000 | Sale | SEC |
| 2026-03-02 | Zeidel Darren | Officer | 4,300 | $329.72 | $1.4M | Sale | SEC |
| 2026-02-19 | Zeidel Darren | Officer | 5,040 | $325.79 | $1.6M | Sale | SEC |
| 2025-11-07 | Zeidel Darren | Officer | 8,800 | $344.52 | $3.0M | Sale | SEC |
| 2024-12-02 | Simon Mindy F. | Officer | 650 | $394.34 | $256,321 | Sale | SEC |
| 2024-11-29 | Stevens Lisa | Officer | 1,275 | $387.68 | $494,292 | Sale | SEC |
| 2024-08-14 | Zeidel Darren | Officer | 950 | $329.15 | $312,692 | Sale | SEC |
| 2024-08-14 | Stevens Lisa | Officer | 400 | $328.95 | $131,580 | Sale | SEC |
| 2024-07-30 | Zeidel Darren | Officer | 6,597 | $310.00 | $2.0M | Sale | SEC |
| 2024-03-08 | Stevens Lisa | Officer | 315 | $316.31 | $99,691 | Sale | SEC |
| 2024-03-05 | Andersen Eric | CEO | 5,500 | $313.74 | $1.7M | Sale | SEC |
| 2024-02-26 | Stevens Lisa | Officer | 13,000 | $315.26 | $4.1M | Sale | SEC |
| 2024-02-20 | Davies Christa | CFO | 40,164 | $313.29 | $12.6M | Sale | SEC |
Showing the latest 15 of 92 sales of $50,000+ since 2016.
Compiled automatically from public SEC filings. Not investment advice. Get every new insider purchase in the daily report.
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