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Arthur J. Gallagher stock timeline
A year of the price with every insider trade, planned sale, earnings report and material 8-K marked
252 sessions+16.2% to $281.61
Arthur J. Gallagher (AJG) stock rose 16% over the last 252 sessions, to $281.61. On the way it reported 4 quarters, its insiders filed 6 open-market trades and 10 Form 144 notices of planned sales, and the company filed 2 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 |
|---|---|---|---|---|---|
| Nov 4, 2026 | Form 144 | Form 144: Richard C. Cary plans to sell $1.4M | +5.3% (+3.7% vs SPY) | — | — |
| Nov 4, 2026 | Form 144 | Form 144: William F Ziebell plans to sell $6.7M | +5.3% (+3.7% vs SPY) | — | — |
| Nov 4, 2026 | Insider sale | Ziebell William F sold $6.7M | +5.3% (+3.7% vs SPY) | — | — |
| Nov 2, 2026 | Form 144 | Form 144: Douglas K. Howell plans to sell $837K | +1.0% (+1.5% vs SPY) | +2.0% (+4.7% vs SPY) | — |
| Nov 2, 2026 | Form 144 | Form 144: Douglas K Howell plans to sell $7.7M | +1.0% (+1.5% vs SPY) | +2.0% (+4.7% vs SPY) | — |
| Nov 2, 2026 | Form 144 | Form 144: Christopher E. Mead plans to sell $2.1M | +1.0% (+1.5% vs SPY) | +2.0% (+4.7% vs SPY) | — |
| Nov 2, 2026 | Insider sale | Howell Douglas K sold $4.7M | +1.0% (+1.5% vs SPY) | +2.0% (+4.7% vs SPY) | — |
| Oct 29, 2026 | Earnings | Earnings: beat the EPS estimate by 0.5% | +2.9% (+3.3% vs SPY) | +10.2% (+10.9% vs SPY) | — |
| Sep 15, 2026 | Form 144 | Form 144: Matrix Trust Co plans to sell $3.8M | −2.1% (−1.6% vs SPY) | −6.8% (−8.7% vs SPY) | −8.4% (−10.9% vs SPY) |
| Sep 15, 2026 | Form 144 | Form 144: Richard C Cary plans to sell $253K | −2.1% (−1.6% vs SPY) | −6.8% (−8.7% vs SPY) | −8.4% (−10.9% vs SPY) |
| Sep 15, 2026 | Insider sale | Cary Richard C sold $253K | −2.1% (−1.6% vs SPY) | −6.8% (−8.7% vs SPY) | −8.4% (−10.9% vs SPY) |
| Sep 2, 2026 | Form 144 | Form 144: Scott R Hudson plans to sell $3.2M | +0.9% (+0.5% vs SPY) | −6.7% (−6.8% vs SPY) | −12.0% (−12.5% vs SPY) |
| Sep 2, 2026 | Insider sale | Hudson Scott R sold $3.2M | +0.9% (+0.5% vs SPY) | −6.7% (−6.8% vs SPY) | −12.0% (−12.5% vs SPY) |
| Aug 27, 2026 | 8-K | Directors and officers: departures, appointments, pay | +2.8% (+3.0% vs SPY) | +2.5% (+2.2% vs SPY) | −12.3% (−11.8% vs SPY) |
| Aug 24, 2026 | Form 144 | Form 144: Walter D. Bay plans to sell $3.3M | +3.0% (+3.3% vs SPY) | +1.4% (+0.9% vs SPY) | −13.3% (−14.5% vs SPY) |
| Aug 24, 2026 | Insider sale | Bay Walter D. sold $3.2M | +3.0% (+3.3% vs SPY) | +1.4% (+0.9% vs SPY) | −13.3% (−14.5% vs SPY) |
| Aug 19, 2026 | Form 144 | Form 144: Christopher E Mead plans to sell $900K | +3.6% (+3.4% vs SPY) | +7.8% (+8.0% vs SPY) | −2.6% (−2.0% vs SPY) |
| Aug 19, 2026 | Insider sale | Mead Christopher E sold $900K | +3.6% (+3.4% vs SPY) | +7.8% (+8.0% vs SPY) | −2.6% (−2.0% vs SPY) |
| Jul 30, 2026 | Earnings | Earnings: beat the EPS estimate by 0.9% | −4.7% (−6.4% vs SPY) | −6.9% (−12.3% vs SPY) | −3.3% (−8.9% vs SPY) |
| Apr 30, 2026 | Earnings | Earnings: beat the EPS estimate by 1.0% | −2.6% (−3.6% vs SPY) | −7.3% (−10.4% vs SPY) | −5.2% (−11.3% vs SPY) |
| Mar 12, 2026 | 8-K | Directors and officers: departures, appointments, pay | +1.8% (+2.4% vs SPY) | +2.6% (+3.6% vs SPY) | +8.6% (+5.3% vs SPY) |
| Jan 29, 2026 | Earnings | Earnings: beat the EPS estimate by 1.4% | +1.4% (+1.6% vs SPY) | +2.9% (+4.3% vs SPY) | −6.0% (−4.6% vs SPY) |
Insiders’ record here
In the year on the chart, Arthur J. Gallagher's insiders reported 0 open-market buys ($0) and 6 sales ($19.0M).
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% |
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 → Arthur J. Gallagher: 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.