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Arch Capital Group stock timeline
A year of the price with every insider trade, planned sale, earnings report and material 8-K marked
252 sessions+22.3% to $107.28
Arch Capital Group (ACGL) stock rose 22% over the last 252 sessions, to $107.28. On the way it reported 0 quarters, its insiders filed 11 open-market trades and 4 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 30, 2026 | 8-K | Material definitive agreement | +2.7% (+3.2% vs SPY) | +0.9% (+3.6% vs SPY) | — |
| Oct 29, 2026 | 8-K | Directors and officers: departures, appointments, pay | +2.3% (+4.1% vs SPY) | +6.2% (+11.0% vs SPY) | — |
| Aug 18, 2026 | Form 144 | Form 144: Francois Morin plans to sell $1.1M | +1.1% (+1.8% vs SPY) | +3.4% (+4.5% vs SPY) | −0.9% (+1.6% vs SPY) |
| Aug 18, 2026 | Insider sale | Morin Francois sold $1.1M | +1.1% (+1.8% vs SPY) | +3.4% (+4.5% vs SPY) | −0.9% (+1.6% vs SPY) |
| Jul 20, 2026 | Form 144 | Form 144: David Gansberg plans to sell $7.6M | +0.5% (+0.6% vs SPY) | +2.0% (+2.6% vs SPY) | −3.5% (−7.4% vs SPY) |
| Jul 2, 2026 | Form 144 | Form 144: David Gansberg plans to sell $8.0M | +3.6% (+3.8% vs SPY) | +3.2% (+2.4% vs SPY) | +2.0% (+1.8% vs SPY) |
| Jun 26, 2026 | Form 144 | Form 144: David Gansberg plans to sell $3.2M | +3.4% (+4.1% vs SPY) | +8.0% (+6.6% vs SPY) | +9.6% (+9.0% vs SPY) |
| Jun 9, 2026 | 8-K | Material definitive agreement | +1.0% (+2.6% vs SPY) | +2.4% (+0.6% vs SPY) | +11.1% (+8.5% vs SPY) |
| Jun 3, 2026 | 8-K | Material definitive agreement | +0.3% (+1.0% vs SPY) | +3.1% (+6.1% vs SPY) | +15.4% (+17.1% vs SPY) |
| Jun 3, 2026 | 8-K | Directors and officers: departures, appointments, pay | +0.3% (+1.0% vs SPY) | +3.1% (+6.1% vs SPY) | +15.4% (+17.1% vs SPY) |
| Jun 3, 2026 | Insider sale | Posner Brian S sold $264K | +0.3% (+1.0% vs SPY) | +3.1% (+6.1% vs SPY) | +15.4% (+17.1% vs SPY) |
| May 11, 2026 | Insider sale | Posner Brian S sold $188K | 0.0% (−0.2% vs SPY) | +0.2% (0.0% vs SPY) | −3.7% (−3.6% vs SPY) |
| Apr 30, 2026 | Insider buy | Houston Daniel Joseph bought $499K | +1.9% (+0.9% vs SPY) | +2.1% (−1.0% vs SPY) | −3.7% (−9.8% vs SPY) |
| Mar 11, 2026 | Insider sale | Posner Brian S sold $284K | −1.4% (−1.3% vs SPY) | −1.9% (−0.9% vs SPY) | +2.7% (+2.0% vs SPY) |
| Mar 10, 2026 | Insider sale | Papadopoulo Nicolas sold $2.1M | +0.6% (+0.7% vs SPY) | −2.0% (−0.7% vs SPY) | +3.1% (+3.1% vs SPY) |
| Mar 10, 2026 | Insider sale | Gansberg David sold $569K | +0.6% (+0.7% vs SPY) | −2.0% (−0.7% vs SPY) | +3.1% (+3.1% vs SPY) |
| Feb 11, 2026 | Insider sale | Rajeh Maamoun sold $4.6M | +0.8% (+0.8% vs SPY) | +0.2% (+1.1% vs SPY) | −3.8% (+0.1% vs SPY) |
| Jan 22, 2026 | 8-K | Directors and officers: departures, appointments, pay | +0.2% (−0.3% vs SPY) | +2.0% (+0.6% vs SPY) | +6.5% (+5.9% vs SPY) |
| Dec 15, 2025 | Insider sale | Pasquesi John M sold $829K | +1.9% (+2.1% vs SPY) | +2.4% (+2.3% vs SPY) | −2.8% (−4.4% vs SPY) |
| Dec 12, 2025 | Insider sale | Pasquesi John M sold $19.1M | +0.3% (+1.4% vs SPY) | +3.0% (+4.8% vs SPY) | −3.1% (−4.1% vs SPY) |
| Nov 28, 2025 | Insider sale | Morin Francois sold $757K | −0.5% (−1.0% vs SPY) | −2.2% (−2.9% vs SPY) | +2.1% (+0.6% vs SPY) |
Insiders’ record here
In the year on the chart, Arch Capital Group's insiders reported 1 open-market buy ($499K) and 10 sales ($29.8M). Of the 10 old enough to score, 6 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 +2.5% and after a sale −0.1%.
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% |
| 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 →
Arch Capital Group: 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.