2 Real Estate Marketplace Stocks Tumble as Google Moves In

Core Viewpoint - Shares of Zillow Group Inc and CoStar Group Inc are declining significantly due to Alphabet testing home for-sale ads at the top of Google search results, which could impact their market visibility and competitiveness [1] Group 1: Stock Performance - Zillow Group Inc (ZG) shares are down 7.3%, trading at $67.11, marking its largest single-day percentage drop since February and hitting its lowest level since April [2] - CoStar Group Inc (CSGP) shares are down 6.5%, trading at $63.80, on track for its worst day since October, with a quarter-to-date deficit of 25.4% [3] Group 2: Technical Indicators - ZG is testing a support level at $64, which previously contained bear gaps in October and November, but is now below its 20-day moving average [2] - CSGP has hit a nearly four-year low of $62 and has faced pressure from the descending 20-day moving average since August [3] Group 3: Options Activity - Both companies are experiencing unusual options activity, with ZG's volume at 11 times its intraday average and CSGP's at 19 times [4] - The most popular options for ZG are the February 65 call, while for CSGP, it is the January 16, 2026 70-strike call, with new positions being opened in both contracts [4]