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Affiliated Managers Group stock timeline
A year of the price with every insider trade, planned sale, earnings report and material 8-K marked
252 sessions+40.3% to $362.96
Affiliated Managers Group (AMG) stock rose 40% over the last 252 sessions, to $362.96. On the way it reported 3 quarters, its insiders filed 5 open-market trades and 1 Form 144 notice of planned sales, and the company filed 4 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 |
|---|---|---|---|---|---|
| Jul 30, 2026 | Earnings | Earnings: beat the EPS estimate by 4.7% | +1.5% (−0.2% vs SPY) | +4.2% (−1.2% vs SPY) | +2.8% (−2.7% vs SPY) |
| Jun 30, 2026 | Form 144 | Form 144: David Ryan plans to sell $105K | −1.2% (−2.0% vs SPY) | +4.9% (+4.0% vs SPY) | +5.0% (+6.6% vs SPY) |
| Jun 9, 2026 | 8-K | Material definitive agreement | −2.0% (−0.4% vs SPY) | +4.4% (+2.6% vs SPY) | +6.9% (+4.3% vs SPY) |
| Jun 8, 2026 | Insider sale | Horgen Jay C. sold $5.9M | −0.1% (−0.3% vs SPY) | +5.1% (+4.6% vs SPY) | +5.6% (+4.3% vs SPY) |
| Jun 1, 2026 | Insider buy | Franqui Annette bought $229K | −0.1% (−0.4% vs SPY) | +10.6% (+13.1% vs SPY) | +11.1% (+12.1% vs SPY) |
| May 8, 2026 | Insider sale | Matos Rodriguez Felix V. sold $300K | +1.7% (+0.9% vs SPY) | +1.4% (−0.8% vs SPY) | +12.3% (+11.2% vs SPY) |
| May 6, 2026 | Insider sale | Ryan David Christopher sold $1.0M | +0.8% (−0.6% vs SPY) | −0.7% (−2.7% vs SPY) | +9.8% (+5.3% vs SPY) |
| May 6, 2026 | Insider buy | Cates G. Staley bought $459K | +0.8% (−0.6% vs SPY) | −0.7% (−2.7% vs SPY) | +9.8% (+5.3% vs SPY) |
| May 1, 2026 | Earnings | Earnings: beat the EPS estimate by 1.9% | −1.2% (−1.5% vs SPY) | +1.0% (−0.8% vs SPY) | +2.6% (−2.8% vs SPY) |
| Feb 26, 2026 | 8-K | Directors and officers: departures, appointments, pay | −2.2% (−1.7% vs SPY) | −4.5% (−3.3% vs SPY) | −15.1% (−7.0% vs SPY) |
| Feb 12, 2026 | 8-K | Directors and officers: departures, appointments, pay | +6.6% (+8.1% vs SPY) | +4.5% (+5.6% vs SPY) | −12.5% (−8.1% vs SPY) |
| Feb 12, 2026 | Earnings | Earnings: beat the EPS estimate by 7.3% | +6.6% (+8.1% vs SPY) | +4.5% (+5.6% vs SPY) | −12.5% (−8.1% vs SPY) |
| Dec 11, 2025 | 8-K | Material definitive agreement | −1.0% (+0.1% vs SPY) | −1.9% (−0.1% vs SPY) | +10.4% (+9.4% vs SPY) |
Insiders’ record here
In the year on the chart, Affiliated Managers Group's insiders reported 2 open-market buys ($687K) and 3 sales ($7.3M). Of the 5 old enough to score, 2 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 +20.6% and after a sale +15.2%.
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 |
|---|---|---|---|---|---|
| 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% |
| 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 → Affiliated Managers 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.