CoStar Group is trading at $31.43, up +4.19%, with broader market strength the likeliest context; no clear company-specific announcement was found for November 2.

  • Its recent Q3 report featured $952 million in revenue and higher full-year profit guidance, alongside weak bookings; the report predates today’s move.
  • The S&P 500 was up 0.56%, Nasdaq up 0.80%, and Dow up 1.01%.