CSGP·CoStar Group, Inc.

Realized volatility (21d)

36.1% 78th pct

Below its peak

-69.8%

vs 200-day average

-23.1%

Up days (1y)

46%

CoStar Group, Inc. is currently running 36.1% annualised volatility over the last 21 sessions. Measured against CSGP's own 13 years of daily returns rather than a market-wide average, that is the 78th percentile — elevated for this stock, against a typical reading of 27.6%. 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.

CSGP is trading -69.8% below its running peak. Across 12 full years on file, its median worst-drawdown-in-a-year was -27.7%, and the deepest was -37.3% 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 -23.1% from its 200-day moving average. Against every other day in its history, that gap ranks at the 7th percentile — a narrower gap than it typically runs. Over the past year CSGP closed higher on 46% of sessions, and it is currently 1 session into a rising streak.

On October specifically: over 13 years of records, CSGP finished the month higher 5 of 13 times, with a median return of -2.3% and an average of -0.7%. Its strongest month historically has been November at +4.4% on average, its weakest September at -2.8%. 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: CSGP has opened more than 2% away from the prior close in 121 of 3,267 sessions (3.7% of the time), with the largest gaps running +19.7% and -10.1%. 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, CSGP moved an average of 6.2% in the session after earnings, closing higher 1 of those 3 times, with a median move of -2.1% and a largest of +13.9%.

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