Judge Denied Zillow Motion to Dismiss Antitrust Lawsuit
Agents allege Zillow leveraged its market dominance to mandate the use of specific business tools and services.
Updated on Sept. 29, 2026 in Residential
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A federal judge has denied Zillow's attempt to dismiss a class action lawsuit alleging the company uses its significant market influence to steer clients toward its lending services. The litigation centers on claims that the portal requires agents to adopt specific software and loan products to receive lead referrals.
Why it matters
The case highlights potential barriers for real estate professionals who rely on major digital platforms to secure client leads and maintain their business operations. If the plaintiffs succeed, it could alter how agents interact with the listing portals that currently dominate the market.
The lawsuit alleges Zillow demands a 40% commission cut from referrals and requires agents to pay $500 per month for the Follow Up Boss CRM. The court noted Zillow holds an estimated 61%-64% market share.
The players
Judge James Robart
A federal judge presiding over the antitrust case in the Western District of Washington.
Zillow
A major real estate technology company and portal that provides search tools, lead generation for agents, and home financing services.
Stephanie Dupuis
The lead plaintiff in the class action lawsuit residing in Kitsap County.
The details
Plaintiffs allege Zillow ties agent access to leads and referrals to the mandatory adoption of Zillow Home Loans and the Follow Up Boss CRM system. By requiring these specific tools, agents claim the portal forces a dependency that stifles competition and mandates specific financial costs for access to the broader housing market.
Timeline
January 2026: The Dupuis lawsuit was initially filed.
June 2026: Zillow filed a motion to dismiss the lawsuit.
September 28, 2026: Judge Robart issued the ruling denying the motion.
The Home Front
This litigation follows the legal standards established by the Sherman Antitrust Act to prevent market monopolization. It reflects a growing regulatory focus on the influence major digital portals have over the real estate brokerage industry.
If you are currently working with a real estate agent, consider asking how their lead-generation tools or preferred mortgage lenders were selected. You may also want to verify if your agent uses multiple platforms to market your home rather than relying exclusively on a single portal.
The takeaway
This ruling ensures the antitrust lawsuit against Zillow will proceed, signaling ongoing scrutiny of portal-mandated business tools. Homeowners and agents should monitor the case for potential changes in how referral leads and home loan services are bundled within the industry.
Further reading
Learn more about how digital tools shape the market in our Residential section.
Source note: This article includes information reported by RISMedia.
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