AMT·American Tower Corporation

Realized volatility (21d)

28.1% 81st pct

Below its peak

-40.9%

vs 200-day average

+1.5%

Up days (1y)

55%

American Tower Corporation is currently running 28.1% annualised volatility over the last 21 sessions. Measured against AMT's own 13 years of daily returns rather than a market-wide average, that is the 81st percentile — elevated for this stock, against a typical reading of 20.7%. The distinction matters because a number that looks calm for one stock is turbulent for another, and the absolute figure on its own tells you neither.

AMT is trading -40.9% below its running peak. Across 12 full years on file, its median worst-drawdown-in-a-year was -15.7%, and the deepest was -35.6% in 2022. The current drawdown is already deeper than this stock's typical annual low point, which puts it in the part of its range where past recoveries began — and where past declines also continued.

Price sits +1.5% from its 200-day moving average. Against every other day in its history, that gap ranks at the 46th percentile — close to the gap it normally carries. Over the past year AMT closed higher on 55% of sessions, and it is currently 1 session into a falling streak.

On October specifically: over 13 years of records, AMT finished the month higher 8 of 13 times, with a median return of +4.4% and an average of +2.6%. Its strongest month historically has been May at +2.9% on average, its weakest September at -5.7%. Seasonality is a weak signal on its own — a decade is a small sample and regimes change — but it is a real distribution rather than a rule of thumb.

Overnight risk is measurable too: AMT has opened more than 2% away from the prior close in 54 of 3,265 sessions (1.7% of the time), with the largest gaps running +4.6% and -7.9%. For anyone holding through an event, that rate is a better guide to overnight exposure than the intraday range.

Across the last 3 dated reports on file, AMT moved an average of 2.7% in the session after earnings, closing higher 1 of those 3 times, with a median move of -0.5% and a largest of -3.8%.

All figures computed from 3,266 daily closes between 2013-10-15 and 2026-10-13, split-adjusted, recomputed daily. Percentiles are against AMT's own 13-year history, not a peer group or index.