ACHR·Archer Aviation Inc.

Realized volatility (21d)

79.5% 61st pct

Below its peak

-66.7%

vs 200-day average

-10.0%

Up days (1y)

47%

Archer Aviation Inc. is currently running 79.5% annualised volatility over the last 21 sessions. Measured against ACHR's own 6 years of daily returns rather than a market-wide average, that is the 61st percentile — a little above its own norm, against a typical reading of 71.3%. 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.

ACHR is trading -66.7% below its running peak. Across 5 full years on file, its median worst-drawdown-in-a-year was -50.4%, and the deepest was -73.0% 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 -10.0% from its 200-day moving average. Against every other day in its history, that gap ranks at the 56th percentile — a somewhat wider gap than its own norm. Over the past year ACHR closed higher on 47% of sessions, and it is currently 3 sessions into a rising streak.

On September specifically: over 5 years of records, ACHR finished the month higher 1 of 5 times, with a median return of -10.8% and an average of -11.8%. Its strongest month historically has been November at +34.5% on average, its weakest September at -11.8%. 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: ACHR has opened more than 2% away from the prior close in 270 of 1,433 sessions (18.8% of the time), with the largest gaps running +10.3% and -10.6%. For anyone holding through an event, that rate is a better guide to overnight exposure than the intraday range.

All figures computed from 1,434 daily closes between 2020-12-18 and 2026-09-04, split-adjusted, recomputed daily. Percentiles are against ACHR's own 6-year history, not a peer group or index.