Why This News Is Significant Key Takeaways Google is getting deeper into the home listings game, in what could mean more competition for Zillow and other real estate sites. Shares of Zillow Group (Z), which claims to be the most visited real estate website in the U.S., tumbled over 10% Monday after Alphabet's (GOOGL) Google began testing full home ads in its search results, including links to request tours and agent contacts. Other companies with home listing sites such as CoStar (CSGP) and Rocket Companies ...