BIO·Bio-Rad Laboratories, Inc. Class A Common Stock

Realized volatility (21d)

38.1% 83rd pct

Below its peak

-56.0%

vs 200-day average

+17.6%

Up days (1y)

50%

Bio-Rad Laboratories, Inc. Class A Common Stock is currently running 38.1% annualised volatility over the last 21 sessions. Measured against BIO's own 13 years of daily returns rather than a market-wide average, that is the 83rd percentile — elevated for this stock, against a typical reading of 25.8%. 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.

BIO is trading -56.0% below its running peak. Across 12 full years on file, its median worst-drawdown-in-a-year was -20.9%, and the deepest was -52.2% 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 +17.6% from its 200-day moving average. Against every other day in its history, that gap ranks at the 82nd percentile — a wider gap than this stock usually carries. Over the past year BIO closed higher on 50% of sessions, and it is currently 2 sessions into a falling streak.

On October specifically: over 13 years of records, BIO finished the month higher 7 of 13 times, with a median return of +1.3% and an average of -1.2%. Its strongest month historically has been July at +7.7% on average, its weakest September at -2.6%. 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: BIO has opened more than 2% away from the prior close in 106 of 3,267 sessions (3.2% of the time), with the largest gaps running +11.7% and -14.2%. 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, BIO moved an average of 5.6% in the session after earnings, closing higher 2 of those 3 times, with a median move of +1.8% and a largest of -8.4%.

All figures computed from 3,268 daily closes between 2013-10-15 and 2026-10-13, split-adjusted, recomputed daily. Percentiles are against BIO's own 13-year history, not a peer group or index.