The lawsuit, Breidert v. Zillow Group, Inc., covers individuals who acquired Class A or Class C common stock between February 11, 2025, and May 7, 2026. Plaintiffs allege that Zillow and its executives violated federal securities laws by failing to disclose critical information about the nature of their agreement with Redfin.

Specifically, the complaint argues that the transaction functioned as an acquisition rather than the partnership Zillow described. According to the filing, this characterization masked a heightened risk of antitrust scrutiny and regulatory liability. The suit further contends that even after antitrust litigation emerged, the company downplayed its legal exposure, leaving investors with a distorted view of its operations and financial risks.