RGEN·Repligen Corporation

Realized volatility (21d)

42.3% 48th pct

Below its peak

-42.6%

vs 200-day average

+32.0%

Up days (1y)

54%

Repligen Corporation is currently running 42.3% annualised volatility over the last 21 sessions. Measured against RGEN's own 13 years of daily returns rather than a market-wide average, that is the 48th percentile — close to its own typical level, against a typical reading of 42.9%. 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.

RGEN is trading -42.6% below its running peak. Across 12 full years on file, its median worst-drawdown-in-a-year was -29.7%, and the deepest was -45.5% 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 +32.0% from its 200-day moving average. Against every other day in its history, that gap ranks at the 88th percentile — a wider gap than this stock usually carries. Over the past year RGEN closed higher on 54% of sessions, and it is currently 2 sessions into a rising streak.

On October specifically: over 13 years of records, RGEN finished the month higher 7 of 13 times, with a median return of +2.0% and an average of +2.7%. Its strongest month historically has been July at +8.4% on average, its weakest September at -3.3%. 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: RGEN has opened more than 2% away from the prior close in 272 of 3,267 sessions (8.3% of the time), with the largest gaps running +28.0% 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 3,268 daily closes between 2013-10-07 and 2026-10-05, split-adjusted, recomputed daily. Percentiles are against RGEN's own 13-year history, not a peer group or index.