American Tower Corporation (REIT) (AMT)
AMT moved a median of -0.01% 30 minutes after news, and -0.04% by the close. How AMT actually reacts to news — the realized, point-in-time move the market made, measured across 410 labeled events over the last three years with zero look-ahead.
AMT’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | -0.04% | 40% | 410 |
| 30-min | -0.01% | 49% | 410 |
| 60-min | +0.05% | 51% | 410 |
| to close | -0.04% | 49% | 408 |
| Middle 50% of AMT reactions | -0.50% to +0.77% |
|---|---|
| Median reaction (30-min) | -0.01% |
| Measured reactions | 410 |
Half of all American Tower Corporation (REIT) news events land between -0.50% and +0.77% at 30 minutes.
Reaction stats as of 2026-08-31. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How AMT reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 33 | +0.16% | 52% | +0.56% |
| Analyst downgrades | 22 | +0.09% | 50% | -0.55% |
| Coverage initiations | 22 | -0.12% | 46% | -0.20% |
| Rating reiterations | 108 | -0.01% | 47% | -0.13% |
| Price-target raises | 36 | +0.10% | 61% | +0.04% |
| Price-target cuts | 48 | -0.07% | 42% | -0.05% |
Last 3 years, pulled 2026-08-31. Reaction = percent move vs. the price at the news timestamp. Counts and medians only. The same measurement runs across every name in the dataset. See how AMT ranks against every other measured name →
That’s how AMT usually reacts — get an email when it moves on news →Email me when AMT moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to AMT's baseline. Nothing else.
Recent AMT events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| American Tower Corporation Prices Senior Notes Offering | Press release | Business Wire | -1.00% | -1.82% | |
| Form 8-K AMERICAN TOWER CORP /MA/ For: Sep 09 | SEC filing · Form 8-K | SEC EDGAR | -1.00% | -1.82% | |
| American Tower to Present at Upcoming September Conferences | Press release | Business Wire | +0.94% | +1.61% | |
| CoreSite Announces Access to Oracle Cloud San Jose Region Through OCI FastConnect | Press release | Business Wire | +1.14% | +0.07% | |
| American Tower to Present at the TD Cowen 12th Annual Communications Infrastructure Summit | Press release | Business Wire | -1.26% | -3.36% | |
| American Tower Corporation Reports Second Quarter 2026 Financial Results | Press release | Business Wire | +1.82% | +1.16% | |
| Form 10-Q AMERICAN TOWER CORP /MA/ For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | +0.13% | +2.46% | |
| Form 8-K AMERICAN TOWER CORP /MA/ For: Jul 28 | SEC filing · Form 8-K | SEC EDGAR | +1.82% | +1.16% | |
| Harbor Link Deploys Underground Fiber into CoreSite DC2 Data Center, Expanding Carrier Diversity in Washington, D.C. and Northern Virginia | Press release | Business Wire | -0.91% | -0.08% | |
| New State of the Data Center Report: Hybrid IT Now Dominates Enterprise Architecture, with Colocation Anchoring Critical Workloads | Press release | Business Wire | -0.06% | -0.34% | |
| American Tower Corporation Releases 2025 Sustainability Executive Report | Press release | Business Wire | -1.24% | -2.46% | |
| American Tower Plans Second Quarter 2026 Earnings Release and Conference Call | Press release | Business Wire | +1.24% | +1.56% | |
| Form CERT AMERICAN TOWER CORP /MA/ | SEC filing · Form CERT | SEC EDGAR | -0.44% | -2.02% | |
| Form 8-K AMERICAN TOWER CORP /MA/ For: Jun 02 | SEC filing · Form 8-K | SEC EDGAR | +0.71% | +0.07% | |
| Form 8-K AMERICAN TOWER CORP /MA/ For: Jun 02 | SEC filing · Form 8-K | SEC EDGAR | +1.73% | -1.07% | |
| American Tower to Present at Nareit’s REITweek: 2026 Investor Conference | Press release | Business Wire | -0.24% | +0.60% | |
| Form 8-A12B AMERICAN TOWER CORP /MA/ | SEC filing · Form 8-A12B | SEC EDGAR | +0.80% | -0.16% | |
| Form 8-K AMERICAN TOWER CORP /MA/ For: May 27 | SEC filing · Form 8-K | SEC EDGAR | +0.80% | -0.16% | |
| Form S-8 AMERICAN TOWER CORP /MA/ | SEC filing · Form S-8 | SEC EDGAR | +0.80% | -0.16% | |
| American Tower Corporation Declares Quarterly Distribution | Press release | Business Wire | -0.60% | -0.63% | |
| Form 8-K AMERICAN TOWER CORP /MA/ For: May 20 | SEC filing · Form 8-K | SEC EDGAR | -0.60% | -0.63% | |
| American Tower Corporation Prices Senior Notes Offering | Press release | Business Wire | -0.15% | +1.13% | |
| Form 8-K AMERICAN TOWER CORP /MA/ For: May 19 | SEC filing · Form 8-K | SEC EDGAR | -0.15% | +1.13% | |
| American Tower to Present at Upcoming May Conferences | Press release | Business Wire | +0.11% | -1.38% | |
| CRN Honors Three CoreSite Leaders on the 2026 Women of the Channel List | Press release | Business Wire | -0.12% | +0.02% | |
| Form 8-K AMERICAN TOWER CORP /MA/ For: May 07 | SEC filing · Form 8-K | SEC EDGAR | +0.11% | -1.38% | |
| American Tower Corporation Reports First Quarter 2026 Financial Results | Press release | Business Wire | -0.51% | -0.04% | |
| CoreSite Launches 100G Ethernet Virtual Circuits on Open Cloud Exchange® Interconnection Platform | Press release | Business Wire | +0.32% | -0.21% | |
| Form 10-Q AMERICAN TOWER CORP /MA/ For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | +0.45% | +0.37% | |
| Form 8-K AMERICAN TOWER CORP /MA/ For: Apr 28 | SEC filing · Form 8-K | SEC EDGAR | -0.51% | -0.04% | |
| Form DEFA14A AMERICAN TOWER CORP /MA/ | SEC filing · Form DEFA14A | SEC EDGAR | +0.45% | +0.37% | |
| Form ARS AMERICAN TOWER CORP /MA/ For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | +0.30% | +1.22% | |
| Form DEF 14A AMERICAN TOWER CORP /MA/ For: May 20 | SEC filing · Form DEF | SEC EDGAR | +0.30% | +1.22% | |
| Form DEFA14A AMERICAN TOWER CORP /MA/ | SEC filing · Form DEFA14A | SEC EDGAR | +0.30% | +1.22% | |
| American Tower Plans First Quarter 2026 Earnings Release and Conference Call | Press release | Business Wire | +0.58% | -0.72% | |
| CoreSite Becomes a Google Gold Verified Peering Provider | Press release | Business Wire | -0.24% | -2.42% | |
| Form 8-K AMERICAN TOWER CORP /MA/ For: Mar 06 | SEC filing · Form 8-K | SEC EDGAR | -0.67% | -1.49% | |
| American Tower Corporation Declares Quarterly Distribution | Press release | Business Wire | +0.00% | +0.37% | |
| Form 8-K AMERICAN TOWER CORP /MA/ For: Mar 05 | SEC filing · Form 8-K | SEC EDGAR | +0.00% | +0.37% | |
| American Tower to Present at the Deutsche Bank Media, Internet and Telecom Conference | Press release | Business Wire | +1.11% | +1.45% | |
| Form 8-K AMERICAN TOWER CORP /MA/ For: Feb 25 | SEC filing · Form 8-K | SEC EDGAR | +0.00% | +0.10% | |
| CoreSite Miami and Virginia Data Centers Welcome New Community IX Internet Exchanges | Press release | Business Wire | -0.59% | -1.14% | |
| American Tower Corporation Reports Fourth Quarter and Full Year 2025 Financial Results | Press release | Business Wire | +2.22% | +1.08% | |
| Form 10-K AMERICAN TOWER CORP /MA/ For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | -1.37% | -4.76% | |
| Form 8-K AMERICAN TOWER CORP /MA/ For: Feb 24 | SEC filing · Form 8-K | SEC EDGAR | +2.22% | +1.08% | |
| Maile Kaiser of CoreSite Honored as a CRN® Channel Chief | Press release | Business Wire | +0.10% | -0.02% | |
| Form 8-K AMERICAN TOWER CORP /MA/ For: Jan 26 | SEC filing · Form 8-K | SEC EDGAR | -0.66% | -1.06% | |
| Form 8-K AMERICAN TOWER CORP /MA/ For: Jan 28 | SEC filing · Form 8-K | SEC EDGAR | +0.28% | +2.16% | |
| American Tower Plans Fourth Quarter and Full Year 2025 Earnings Release and Conference Call | Press release | Business Wire | +0.16% | -1.42% | |
| American Tower Corporation Announces Tax Reporting Information for 2025 Distributions | Press release | Business Wire | +0.25% | -0.39% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the AMT section they belong to.
Where else AMT is measured.
AMT earnings → · Analyst actions → · SEC filings →
Other Communication Services names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| TELECOM ITALIA (TI) | 438 | 0.00% | 41% |
| MAGICJACK VOCALTEC (CALL) | 412 | 0.00% | 45% |
| PDVWIRELESS (PDVW) | 407 | 0.00% | 40% |
| Ooma, Inc. (OOMA) | 401 | 0.00% | 46% |
Same sector, same measurement: percent move vs. the price at the news timestamp, read at 30 minutes. Sample sizes differ, so the medians are comparable but the confidence behind them is not.
All Communication Services names, measured the same way →
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How the numbers are made.
How is American Tower Corporation (REIT)'s median reaction calculated?
Every labeled AMT news event is measured from its own timestamp: the last trade before the news is the base price, and the move is read at fixed horizons — 30 minutes of trading, then the close. The median across 410 events is what this page reports. Point-in-time, zero look-ahead: no event borrows information from a later one.
What counts as a positive reaction?
Any event whose price move is above zero at the horizon, relative to the last trade before the news timestamp. 49% of AMT's measured events are up at 30 minutes; the rest close the window flat or negative.
How often is this page updated?
The news table refreshes automatically as new events are labeled and priced. The reaction medians are re-pulled in batches from the dataset — the figures here are as of 2026-08-31.
Does AMT's past reaction predict its next one?
No. These are realized facts about past events, not forecasts. They describe a distribution — they say nothing certain about any future move.