AON insider buying and SEC filings, explained
Aon plc · CIK 315293
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Company profile
- Exchanges
- NYSE
- Industry (SIC)
- Insurance Agents, Brokers & Service
- State of incorporation
- L2
- Fiscal year end
- Dec 31
- Former names
- AON CORP
Insider activity in the last 12 months
Bought
$7.8M
Insiders who bought
1
Sold (not marked 10b5-1)
$4.4M
Planned sales (10b5-1)
$3.3M
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Sep 2, 2026 | Purchase (code P) | Lester B. Knight (Director) bought 20,000 shares indirectly (by entity) at about $327.48 ($6.5M), reported as a purchase (code P). Holdings by entity up 14% to 163,000 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 3, 2026 |
| Jul 28, 2026 | Planned (10b5-1) | Darren Zeidel (General Counsel) sold 1,900 shares at about $377.76 ($718K), marked as a 10b5-1 plan trade. Holdings down 14% to 11,504 shares. | SEC filing Filed Jul 30, 2026 |
| Jul 17, 2026 | Planned (10b5-1) | Darren Zeidel (General Counsel) sold 1,950 shares at about $372.05 ($726K), marked as a 10b5-1 plan trade. Holdings down 13% to 13,404 shares. | SEC filing Filed Jul 21, 2026 |
| Jul 7, 2026 | Planned (10b5-1) | Darren Zeidel (General Counsel) sold 600 shares at $360.00 ($216K), marked as a 10b5-1 plan trade. Holdings down 4% to 15,354 shares. | SEC filing Filed Jul 9, 2026 |
| Feb 26, 2026 | Sale | Darren Zeidel (General Counsel) sold 4,300 shares at about $329.72 ($1.4M). Holdings down 21% to 15,954 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 2, 2026 |
| Feb 17, 2026 | Planned (10b5-1) | Darren Zeidel (General Counsel) sold 5,040 shares at $325.79 ($1.6M), marked as a 10b5-1 plan trade. Holdings down 20% to 20,254 shares. | SEC filing Filed Feb 19, 2026 |
| Feb 10, 2026 | Purchase (code P) | Lester B. Knight (Director) bought 4,000 shares indirectly (by entity) at about $319.24 ($1.3M), reported as a purchase (code P). Holdings by entity up 3% to 143,000 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Feb 12, 2026 |
| Nov 5, 2025 | Sale | Darren Zeidel (General Counsel) sold 8,800 shares at about $344.52 ($3.0M). Holdings down 30% to 20,253 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 7, 2025 |
34 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
No cluster buys in the last 12 months.
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
| Filed | Items | Tag | Source |
|---|---|---|---|
| Oct 28, 2026, 6:35 AM ET 8-K | Earnings released (Item 2.02) | SEC filing |
Red flags are objective triggers only: the item or form filed, never an opinion.
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