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American Tower stock timeline
A year of the price with every insider trade, planned sale, earnings report and material 8-K marked
252 sessions+10.3% to $188.79
American Tower (AMT) stock rose 10% over the last 252 sessions, to $188.79. On the way it reported 0 quarters, its insiders filed 2 open-market trades and 4 Form 144 notices of planned sales, and the company filed 10 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 | Form 144 | Form 144: Juan Font Hernandez plans to sell $112K | +1.0% (+2.8% vs SPY) | +4.3% (+9.1% vs SPY) | — |
| Oct 28, 2026 | Form 144 | Form 144: Ruth T Dowling plans to sell $290K | 0.0% (−0.4% vs SPY) | +1.9% (+3.9% vs SPY) | — |
| Sep 18, 2026 | 8-K | Directors and officers: departures, appointments, pay | −0.9% (−1.0% vs SPY) | −4.8% (−5.7% vs SPY) | +6.5% (+6.1% vs SPY) |
| Sep 14, 2026 | 8-K | Material definitive agreement | +0.4% (+0.9% vs SPY) | −1.3% (−3.2% vs SPY) | +2.5% (0.0% vs SPY) |
| Aug 21, 2026 | Insider buy | Kalathur Rajesh bought $501K | +0.1% (−0.4% vs SPY) | −0.9% (−2.0% vs SPY) | −0.6% (−2.3% vs SPY) |
| Jul 29, 2026 | Form 144 | Form 144: Robert Meyer plans to sell $894K | +4.4% (+6.0% vs SPY) | +2.2% (−1.9% vs SPY) | +2.5% (−0.9% vs SPY) |
| Jul 29, 2026 | Insider sale | Meyer Robert Joseph sold $894K | +4.4% (+6.0% vs SPY) | +2.2% (−1.9% vs SPY) | +2.5% (−0.9% vs SPY) |
| Jul 28, 2026 | Form 144 | Form 144: Ruth T Dowling plans to sell $299K | +2.8% (+2.6% vs SPY) | +3.7% (+1.2% vs SPY) | +6.9% (+3.3% vs SPY) |
| May 27, 2026 | 8-K | Material definitive agreement | 0.0% (0.0% vs SPY) | +0.3% (−0.9% vs SPY) | −8.2% (−6.3% vs SPY) |
| May 21, 2026 | 8-K | Directors and officers: departures, appointments, pay | 0.0% (−0.3% vs SPY) | +1.7% (−0.1% vs SPY) | −1.5% (−0.5% vs SPY) |
| May 7, 2026 | 8-K | Material definitive agreement | −1.8% (−2.6% vs SPY) | −5.3% (−7.5% vs SPY) | +5.1% (+4.0% vs SPY) |
| Mar 10, 2026 | 8-K | Directors and officers: departures, appointments, pay | −1.8% (−1.6% vs SPY) | −0.6% (+0.4% vs SPY) | −3.4% (−4.1% vs SPY) |
| Feb 27, 2026 | 8-K | Directors and officers: departures, appointments, pay | −0.9% (−0.9% vs SPY) | −1.7% (+0.3% vs SPY) | −11.9% (−4.0% vs SPY) |
| Jan 29, 2026 | 8-K | Directors and officers: departures, appointments, pay | −1.1% (−0.8% vs SPY) | −5.6% (−3.2% vs SPY) | +4.8% (+5.9% vs SPY) |
| Dec 5, 2025 | 8-K | Material definitive agreement | +2.4% (+2.7% vs SPY) | +1.0% (+1.6% vs SPY) | −4.4% (−5.3% vs SPY) |
| Nov 7, 2025 | 8-K | Directors and officers: departures, appointments, pay | −0.1% (−0.2% vs SPY) | +1.7% (+1.4% vs SPY) | +2.9% (+0.9% vs SPY) |
Insiders’ record here
In the year on the chart, American Tower's insiders reported 1 open-market buy ($501K) and 1 sale ($894K). Of the 1 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 — and after a sale −3.0%.
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 →
American Tower: 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.