CoStar’s 1.92% Rally Drives $230M Volume at 445th Rank Amid Zillow Lawsuit and 15.2% Revenue Surge

On August 15, 2025, CoStar Group (CSGP) rose 1.92% to $88.95, with a trading volume of $230 million, ranking 445th in market activity. Recent developments include a copyright infringement lawsuit against Zillow, which could impact CoStar’s real estate data licensing strategies. The company also reported Q2 earnings exceeding expectations, driven by a 15.2% year-over-year revenue increase to $781.3 million. Institutional investors, including E Fund Management, boosted stakes, while insider sales of 25,000 shares by Frederick G. Saint signaled mixed signals among shareholders.

CoStar’s legal dispute with Zillow over alleged copyright violations has drawn attention to its data intellectual property protections. The lawsuit, seeking damages exceeding $1 billion, underscores the competitive dynamics in real estate tech. Meanwhile, the firm raised its annual revenue forecast due to strong net bookings, reflecting confidence in its market position. Analysts have maintained a “Moderate Buy” consensus, with an average target price of $93.25, though insider sales and a 0.79% post-market decline hint at lingering caution.

A backtested strategy from 2022 to 2025—buying the top 500 stocks by daily volume and holding for one day—yielded a total profit of $10,720, with cumulative returns at 1.08 times initial investment. This highlights the role of trading volume in identifying short-term momentum opportunities, though CoStar’s performance remains tied to its core real estate data and litigation outcomes.