RGEN·Repligen Corporation

Realized volatility (21d)

57.2% 80th pct

Below its peak

-46.8%

vs 200-day average

+21.9%

Up days (1y)

54%

Repligen Corporation is currently running 57.2% 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 80th percentile — elevated for this stock, 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 -46.8% 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 +21.9% from its 200-day moving average. Against every other day in its history, that gap ranks at the 76th percentile — a somewhat wider gap than its own norm. Over the past year RGEN closed higher on 54% of sessions, and it is currently 1 session 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 +2.2% and an average of +2.9%. 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 2013-10-15 and 2026-10-13, split-adjusted, recomputed daily. Percentiles are against RGEN's own 13-year history, not a peer group or index.