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Compass study links Zillow access to lower sale-to-list ratios
Compass analyzed 296,966 listings from January 2025 to May 2026 and estimated the pricing gap could translate to about $13,000 on a $1 million home.
Compass International Holdings said its analysis of 296,966 home listings posted between January 2025 and May 2026 found that homes that appeared on Zillow sold for a lower sale-to-list ratio than comparable listings that were barred from appearing on the portal. In the study, 806 “banned” listings had a median sale-to-list price ratio of 100%, while non-banned listings averaged 98.7%, a difference Compass described as a “Zillow Tax.” Compass said pending speed and likelihood were statistically similar between the two groups, but it pointed to portal features that it said could increase price pressure, including days on market and Zestimate. Compass estimated that a 1.3 percentage point gap could mean roughly $13,000 in seller proceeds on a $1 million home. Using quantile regression, the firm said the difference was statistically significant, with a margin of error of plus or minus 0.8 percentage points. The findings add to the backdrop of ongoing legal disputes between Compass and Zillow. HousingWire reports that Compass and Zillow have both filed antitrust actions involving Zillow’s listing access standards, as well as complaints related to Zillow’s advertising claims, and a House Judiciary subcommittee is also seeking explanations tied to data and listing partnerships.