FTC’s Zillow/Redfin Case Faces Critical Legal Challenge Over Market Definition

In a memorandum filed Jan. 13, defendants Zillow and Redfin are asking a federal judge to throw out the Federal Trade Commission’s (FTC) antitrust case against their $100 million partnership—and their arguments reveal potential weaknesses in how the government defined the market it’s trying to regulate. First filed Sept. 30, 2025, the FTC alleged that…

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