MDB·MongoDB

Realized volatility (21d)

78.2% 82nd pct

Below its peak

-36.1%

vs 200-day average

+9.9%

Up days (1y)

51%

MongoDB is currently running 78.2% annualised volatility over the last 21 sessions. Measured against MDB's own 9 years of daily returns rather than a market-wide average, that is the 82nd percentile — elevated for this stock, against a typical reading of 55.0%. 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.

MDB is trading -36.1% below its running peak. Across 8 full years on file, its median worst-drawdown-in-a-year was -43.3%, and the deepest was -71.8% in 2022. The current pullback is therefore shallower than what this stock gives back in a typical year, which is context worth having before treating it as a dislocation.

Price sits +9.9% from its 200-day moving average. Against every other day in its history, that gap ranks at the 50th percentile — close to the gap it normally carries. Over the past year MDB closed higher on 51% of sessions, and it is currently 1 session into a rising streak.

On October specifically: over 9 years of records, MDB finished the month higher 6 of 9 times, with a median return of +5.1% and an average of +3.6%. Its strongest month historically has been August at +13.8% on average, its weakest September at -4.7%. 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: MDB has opened more than 2% away from the prior close in 191 of 2,257 sessions (8.5% of the time), with the largest gaps running +8.3% and -11.5%. For anyone holding through an event, that rate is a better guide to overnight exposure than the intraday range.

All figures computed from 2,258 daily closes between 2017-10-19 and 2026-10-14, split-adjusted, recomputed daily. Percentiles are against MDB's own 9-year history, not a peer group or index.