CoStar Group Stock Slumps Amid 403rd Volume Rankings as Institutional Selloff Contrasts with Bullish Buys

On August 20, 2025, CoStar Group (CSGP) closed with a 0.79% decline, trading at $88.25 per share. The stock saw a daily trading volume of 0.26 billion, ranking 403rd in market activity. Institutional investor activity dominated headlines, with the Public Sector Pension Investment Board reducing its stake by 60.6% in Q1 2025, retaining 112,668 shares valued at $8.93 million. Conversely, Independent Advisor Alliance and Polen Capital Management increased holdings, with the latter adding 104,612 shares to its position, now worth $523 million.

Insider transactions also influenced sentiment. CAO Cynthia Cammett Cann sold 2,033 shares, reducing her ownership by 7.31%, while Frederick G. Saint offloaded 25,000 shares, a 7.26% stake cut. Analyst ratings remained cautiously optimistic, with a "Moderate Buy" consensus and an average price target of $93.25. JPMorgan and Needham raised price objectives to $101 and $105, respectively, though Wells Fargo maintained an "underweight" stance with a $70 target.

Backtesting data for a strategy buying the top 500 volume-driven stocks and holding for one day from 2022 to 2025 showed a cumulative profit of $2,385.14, reflecting moderate returns with periodic fluctuations.