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Aon stock timeline
A year of the price with every insider trade, planned sale, earnings report and material 8-K marked
252 sessions−0.8% to $334.81
Aon (AON) stock fell 1% over the last 252 sessions, to $334.81. On the way it reported 4 quarters, its insiders filed 3 open-market trades and 3 Form 144 notices of planned sales, and the company filed 6 material 8-Ks. Each is marked on the price and listed with what the stock did next.
Each mark, and what followed
| Date | Kind | What | Next session | 5 sessions | 21 sessions |
|---|---|---|---|---|---|
| Oct 28, 2026 | Earnings | Earnings: beat the EPS estimate by 1.8% | +4.3% (+3.9% vs SPY) | +9.0% (+11.0% vs SPY) | — |
| Sep 22, 2026 | 8-K | Material definitive agreement | −1.6% (−1.6% vs SPY) | −6.7% (−5.6% vs SPY) | +2.0% (+2.6% vs SPY) |
| Sep 2, 2026 | Insider buy | Knight Lester B bought $6.5M | +1.4% (+0.9% vs SPY) | −6.9% (−6.9% vs SPY) | −16.8% (−17.3% vs SPY) |
| Aug 31, 2026 | 8-K | Material definitive agreement | −10.0% (−9.7% vs SPY) | −9.5% (−9.6% vs SPY) | −25.3% (−24.9% vs SPY) |
| Aug 17, 2026 | 8-K | Directors and officers: departures, appointments, pay | −1.2% (−0.5% vs SPY) | +3.4% (+4.6% vs SPY) | −14.4% (−12.0% vs SPY) |
| Jul 29, 2026 | Earnings | Earnings: beat the EPS estimate by 0.3% | −1.1% (+0.5% vs SPY) | −6.4% (−10.5% vs SPY) | −7.2% (−10.5% vs SPY) |
| Jul 28, 2026 | Form 144 | Form 144: Darren Zeidel plans to sell $718K | +3.8% (+3.5% vs SPY) | −2.4% (−4.9% vs SPY) | −3.2% (−6.8% vs SPY) |
| Jul 17, 2026 | Form 144 | Form 144: Darren Zeidel plans to sell $726K | −0.4% (+0.6% vs SPY) | −3.6% (−1.9% vs SPY) | −3.3% (−6.7% vs SPY) |
| Jul 7, 2026 | Form 144 | Form 144: Darren Zeidel plans to sell $216K | +0.8% (+1.3% vs SPY) | +2.9% (+3.2% vs SPY) | +0.1% (−2.5% vs SPY) |
| Jul 1, 2026 | 8-K | Directors and officers: departures, appointments, pay | +4.0% (+4.1% vs SPY) | +3.4% (+2.6% vs SPY) | +4.8% (+4.6% vs SPY) |
| May 1, 2026 | Earnings | Earnings: beat the EPS estimate by 2.0% | +0.2% (−0.1% vs SPY) | +0.9% (−0.9% vs SPY) | +3.0% (−2.4% vs SPY) |
| Feb 26, 2026 | Insider sale | Zeidel Darren sold $1.4M | +1.7% (+2.3% vs SPY) | +5.0% (+6.1% vs SPY) | −0.3% (+6.7% vs SPY) |
| Feb 10, 2026 | Insider buy | Knight Lester B bought $1.3M | +2.4% (+2.7% vs SPY) | +4.9% (+6.5% vs SPY) | +2.1% (+4.7% vs SPY) |
| Jan 30, 2026 | Earnings | Earnings: beat the EPS estimate by 2.2% | +1.9% (+2.2% vs SPY) | +0.1% (+2.5% vs SPY) | −1.5% (−0.4% vs SPY) |
| Jan 7, 2026 | 8-K | Directors and officers: departures, appointments, pay | +0.1% (+0.4% vs SPY) | −1.5% (−1.8% vs SPY) | −1.9% (+0.2% vs SPY) |
| Jan 2, 2026 | 8-K | Directors and officers: departures, appointments, pay | −2.5% (−2.6% vs SPY) | −0.3% (−1.4% vs SPY) | −1.0% (−2.9% vs SPY) |
Insiders’ record here
In the year on the chart, Aon's insiders reported 2 open-market buys ($7.8M) and 1 sale ($1.4M). Of the 2 old enough to score, 1 were followed by the stock doing what the trade implied over the next 63 sessions (beating SPY after a buy, lagging it after a sale); the median excess return after a buy was −7.1% and after a sale −13.1%.
Across the whole universe (19,782 scored trades), insider buys beat the market 46% of the time and sales were followed by a lagging stock 61% of the time; buys of $1M or more 39%. Every pattern →
What this kind of 8-K usually did
| Item | 8-Ks | Next session, median | Up next session | 21 sessions, median | Typical size |
|---|---|---|---|---|---|
| 5.02 Directors and officers: departures, appointments, pay | 39,174 | −0.1% | 48% | +0.7% | ±1.4% |
| 1.01 Material definitive agreement | 23,525 | 0.0% | 51% | +1.0% | ±1.4% |
| 1.02 Termination of a material agreement | 2,368 | 0.0% | 51% | +1.1% | ±1.5% |
| 2.03 New debt or off-balance-sheet obligation | 13,268 | 0.0% | 50% | +1.2% | ±1.3% |
Across every company in the move-odds universe, measured from the close before the filing. Every 8-K item ranked →
Report card: every quarter against the estimate → Aon: every quarter → Live insider trades →
Prices are daily closes; filings and trades are as filed with the SEC (Form 4 within two business days of the trade, 8-K within four of the event). Moves after a mark are the stock's close-to-close change and the same for SPY; they describe the record, not what the next one will do. Not investment advice.