Pre-market price movements and significant market activity for CoStar Group Inc ($CSGP). Each move is flagged by Z-score statistical significance — showing when $CSGP moved beyond its typical daily range. 2 significant moves detected in the last 30 days.
Current Market State
What May Be Driving CSGP?
Baillie Gifford's bullish outlook and sticky inflation tailwinds drove CSGP up 4.95%.
CoStar Group Inc operates in the Technology sector, specifically Services-Business Services, Nec. Sector-wide movement can contribute to individual stock volatility.
Recent Unusual Moves (30 days)
| Date | Session | Price | Move | Z-Score | Rel. Vol. |
|---|---|---|---|---|---|
| Oct 8, 2026 | Regular | $29.64 | +7.39% | 3.72 | 0.7× |
| Oct 8, 2026 | After-hours | $29.70 | +7.61% | 3.82 | 1.5× |
About CSGP Premarket Movers
This page tracks unusual market activity for CoStar Group Inc (CSGP) across all trading sessions — pre-market (4:00 AM–9:30 AM ET), regular hours (9:30 AM–4:00 PM ET), and after-hours (4:00 PM–8:00 PM ET). A move is flagged as "unusual" when its Z-score reaches 2 or higher, meaning the price change is statistically significant relative to CSGP's recent daily volatility.
Z-score is calculated by comparing each move to the 20-day average return and standard deviation. A Z-score of 2.0 means the move is 2 standard deviations beyond the average — occurring in roughly the top 5% of daily moves. Relative volume (RVOL) compares current volume to the 20-day average volume at the same time of day, helping distinguish genuine institutional activity from noise.