TMUS·T-Mobile US, Inc.

Realized volatility (21d)

39.6% 95th pct

Below its peak

-42.9%

vs 200-day average

-17.2%

Up days (1y)

49%

T-Mobile US, Inc. is currently running 39.6% annualised volatility over the last 21 sessions. Measured against TMUS's own 11 years of daily returns rather than a market-wide average, that is the 95th percentile — an extreme by its own standards, against a typical reading of 22.9%. 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.

TMUS is trading -42.9% below its running peak. Across 10 full years on file, its median worst-drawdown-in-a-year was -16.2%, and the deepest was -28.9% in 2025. 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 -17.2% from its 200-day moving average. Against every other day in its history, that gap ranks at the 1st percentile — a narrower gap than it typically runs. Over the past year TMUS closed higher on 49% of sessions, and it is currently 1 session into a falling streak.

On October specifically: over 11 years of records, TMUS finished the month higher 5 of 11 times, with a median return of -2.4% and an average of -0.0%. Its strongest month historically has been November at +3.1% on average, its weakest September at -2.0%. 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: TMUS has opened more than 2% away from the prior close in 45 of 2,757 sessions (1.6% of the time), with the largest gaps running +6.9% and -7.5%. 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, TMUS moved an average of 3.9% in the session after earnings, closing higher 3 of those 3 times, with a median move of +3.8% and a largest of +5.4%.

All figures computed from 2,758 daily closes between 2015-10-27 and 2026-10-15, split-adjusted, recomputed daily. Percentiles are against TMUS's own 11-year history, not a peer group or index.