Judge Denied Zillow Motion to Dismiss Antitrust Suit
A federal court ruled that antitrust claims against Zillow may proceed to the next stage of litigation.
Updated on Sept. 29, 2026 in Residential
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Judge James Robart denied Zillow’s request to dismiss a class action lawsuit alleging the real estate company engaged in anticompetitive behavior. The court determined that the plaintiffs provided plausible evidence regarding Zillow’s market dominance and illegal business practices.
Why it matters
The ruling allows the case to move forward, keeping Zillow’s business practices under legal scrutiny regarding whether it forces agents to use its mortgage services. The outcome of the litigation could fundamentally alter how the platform manages agent referrals and commissions.
Plaintiffs allege Zillow demands a 40% commission cut from leads while maintaining a 61%-64% market share. Additionally, individual agents claim they pay $500 per month to maintain the mandatory Follow Up Boss CRM system.
The players
James Robart
He is a U.S. District Court Judge for the Western District of Washington who presided over the motion to dismiss.
Zillow
This real estate and rental marketplace company is being sued for alleged monopolistic practices and illegal tying.
Stephanie Dupuis
She is the lead plaintiff in the class action lawsuit against Zillow based in Kitsap County.
The details
The lawsuit claims Zillow leverages its market dominance to steer clients toward its Home Loans business by linking agent ratings in the Follow Up Boss CRM to product usage. Plaintiffs argue this creates an environment where agent referrals are unfairly conditioned upon the adoption of Zillow-owned services.
Timeline
The Dupuis lawsuit was first filed in January 2026.
Zillow filed a motion to dismiss the lawsuit in June 2026.
Judge Robart filed the ruling denying the motion on September 28, 2026.
Culture Shift
This case reflects an increasing societal and legal pushback against the concentration of power within digital marketplace platforms. It signals a shift toward stricter scrutiny of how companies use mandatory software integration to restrict market competition.
The progression of this case could lead to changes in how real estate agents across the country are charged for referrals and software access. Residents may eventually see changes in the competitiveness of their local real estate markets if the court forces alterations to Zillow’s business model.
The takeaway
The court's decision ensures that the allegations regarding Zillow’s market behavior will continue to be investigated in a legal setting. For those working in the real estate industry, this case serves as a key indicator of potential future shifts in portal-agent business relationships.
Further reading
For more background on property market legalities, visit the Residential section.
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