CMS·CMS Energy Corporation

Realized volatility (21d)

15.4% 38th pct

Below its peak

-18.1%

vs 200-day average

-10.0%

Up days (1y)

50%

CMS Energy Corporation is currently running 15.4% annualised volatility over the last 21 sessions. Measured against CMS's own 13 years of daily returns rather than a market-wide average, that is the 38th percentile — on the quiet side for this stock, against a typical reading of 16.7%. 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.

CMS is trading -18.1% below its running peak. Across 12 full years on file, its median worst-drawdown-in-a-year was -11.1%, and the deepest was -29.6% in 2020. 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 -10.0% from its 200-day moving average. Against every other day in its history, that gap ranks at the 3rd percentile — a narrower gap than it typically runs. Over the past year CMS closed higher on 50% of sessions, and it is currently 7 sessions into a rising streak.

On October specifically: over 13 years of records, CMS finished the month higher 10 of 13 times, with a median return of +1.8% and an average of +2.1%. Its strongest month historically has been March at +3.5% on average, its weakest September at -1.8%. 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: CMS has opened more than 2% away from the prior close in 43 of 3,266 sessions (1.3% of the time), with the largest gaps running +4.4% and -22.8%. For anyone holding through an event, that rate is a better guide to overnight exposure than the intraday range.

All figures computed from 3,267 daily closes between 2013-10-14 and 2026-10-09, split-adjusted, recomputed daily. Percentiles are against CMS's own 13-year history, not a peer group or index.