Is Zillow a monopoly? Lawyers weigh in on Compass’s suit

Under the listing standards policy, Zillow is banning any listing not input into the MLS within 24 business hours of the property being publicly marketed. While the policy does allow for office or private exclusive listings, if a client would eventually like the listing to appear on Zillow and it does not sell as a private exclusive, the policy states that the listing broker may only share the office exclusive with other agents in their own brokerage via one-to-one communication. 

Although it will be up to the court to decide whether or not Zillow’s actions were designed to maintain its alleged monopoly power, there is no denying that the firm has a large market share. Data from SimilarWeb shows that in May 2025, Zillow recorded 360.6 million total visits, compared to second…