CoStar Group (CSGP) shares dropped 8.89% amid multiple broker downgrades and lower price target forecasts, alongside a 10.51% decline week-over-week, closing at $44.63. Despite reporting fourth-quarter revenues of $900 million—up 27% from the previous year—and exceeding analyst expectations, the company’s adjusted earnings guidance of 16 to 19 cents per share has raised concerns among investors, contributing to a Zacks Rank of #5 (Strong Sell). These mixed financial signals illustrate a challenging landscape for CoStar as it prepares for 2026, forecasting revenues between $3.78 billion and $3.82 billion.