DXCM·DexCom, Inc.

Realized volatility (21d)

25.0% 9th pct

Below its peak

-47.8%

vs 200-day average

+15.6%

Up days (1y)

53%

DexCom, Inc. is currently running 25.0% annualised volatility over the last 21 sessions. Measured against DXCM's own 13 years of daily returns rather than a market-wide average, that is the 9th percentile — unusually subdued by its own history, against a typical reading of 37.6%. 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.

DXCM is trading -47.8% below its running peak. Across 12 full years on file, its median worst-drawdown-in-a-year was -38.9%, and the deepest was -54.4% in 2024. 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 +15.6% from its 200-day moving average. Against every other day in its history, that gap ranks at the 65th percentile — a somewhat wider gap than its own norm. Over the past year DXCM closed higher on 53% of sessions, and it is currently 1 session into a falling streak.

On October specifically: over 13 years of records, DXCM finished the month higher 5 of 13 times, with a median return of -2.6% and an average of +1.3%. Its strongest month historically has been November at +10.1% on average, its weakest September at -7.8%. 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: DXCM has opened more than 2% away from the prior close in 134 of 3,266 sessions (4.1% of the time), with the largest gaps running +8.1% and -15.3%. 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, DXCM moved an average of 5.6% in the session after earnings, closing higher 3 of those 3 times, with a median move of +6.0% and a largest of +8.3%.

All figures computed from 3,267 daily closes between 2013-10-15 and 2026-10-13, split-adjusted, recomputed daily. Percentiles are against DXCM's own 13-year history, not a peer group or index.