Zillow, Compass CEOs Clash in Chicago MLS Antitrust Suit with 'Disgusting' Testimony

In May 2026 the Chicago MLS filed a federal antitrust suit alleging that Zillow’s updated listing platform and mandatory referral fee structure stifle broker competition and violate Sherman Act provisions. The MLS seeks an injunction to block Zillow’s exclusive listing requirements and steering incentives tied to its Premier Agent program.

Rich Barton testified that MLS demands to exclude partner brokers who don’t pay referral fees are “disgusting” and threaten Zillow’s open marketplace vision. He argued that Zillow’s fee model enhances consumer choice by funding enhanced listing visibility rather than imposing unfair restrictions on broker participation.

Compass CEO Robert Reffkin defended his firm’s use of Zillow’s Premier Agent incentives, stating these programs drive client acquisition and streamline referrals without compromising market fairness. He emphasized that broker partners voluntarily opt into the platform to gain lead generation advantages.

A court hearing for a preliminary injunction is scheduled for Q3 2026, where a judge will decide whether to suspend Zillow’s listing rules pending trial. A ruling against Zillow could force revisions to its referral fee model and impact its strategic partnerships and platform revenue.