The litigation, captioned Breidert v. Zillow Group, Inc., asserts that Zillow executives violated the Securities Exchange Act of 1934 by mischaracterizing a 2025 payout to Redfin as a standard partnership. According to the complaint, the payment was actually intended to eliminate a market competitor and secure Zillow's dominance in the multifamily rental listing sector. The Federal Trade Commission later challenged this arrangement, arguing it served as an unlawful maneuver to stifle industry competition.

Financial fallout from the legal scrutiny intensified on February 10, 2026, when Zillow management disclosed that rising legal expenses would create a significant headwind for EBITDA margins. This announcement sparked a sharp sell-off, with Class C and Class A shares dropping 16.54% and 17.13%, respectively. A federal judge’s recent refusal to dismiss the FTC’s antitrust case has kept downward pressure on the company's valuation. Investors seeking to participate in the class action must petition the court by August 10, 2026.