CoStar Group (CSGP) stock fell 53% year-to-date to $31 as of September 4, 2026. Heavy investment in the Homes.com residential platform drove the decline. Investors remain concerned about the platform's impact on overall profitability. February guidance for lower-than-expected adjusted EBITDA triggered the downward trend.
Wall Street analysts reduced the mean price target by 21% between June and September. The target price dropped from $48 to $37 during that timeframe. CEO Andrew Florance purchased a substantial number of shares in early August. The market continues to weigh long-term growth potential against near-term profit pressures.