CSGP is trading at $43.63 (+16.72%) in after-hours trading despite no company-specific news, earnings, or announcements found for CoStar Group on April 23, 2026.
- The stock closed the regular session at $37.38 (-4.1%) amid a broader market retreat.
- The sharp reversal contrasts with the S&P 500 (-0.47%) and Nasdaq (-0.58%) declines driven by geopolitical tensions in the Strait of Hormuz and mixed tech earnings.