CoStar Group, Inc. (CSGP) closed October 31, 2026 at $30.18 per share, a gain of 7.17% over the prior 24-hour period. The single-session advance provided some relief for shareholders after a difficult stretch in the broader week.
Despite the daily pop, the stock remains down 11.00% over the past seven days, reflecting meaningful selling pressure earlier in the week. The divergence between the short-term and medium-term figures underscores the volatility the commercial real estate data and analytics company has experienced recently.
Zooming out to a 30-day window, CSGP shows a gain of 10.19%, suggesting the longer-term trend has been more constructive even as near-term turbulence persisted. The company carries a market capitalization of $11.32 billion as of this session's close.
The Halloween session capped a month that saw CoStar trade in a wide range, with the 30-day gain and the 7-day loss painting a picture of a stock that rallied sharply at some point during October before giving back a notable portion of those gains late in the period.
