CoStar Group (NASDAQ: CGSP) announced it has filed an amended complaint in its ongoing lawsuit against Zillow (NASDAQ: Z, ZG), alleging the Seattle-based brokerage has continued to commit copyright infringement of its photographs.
According to the updated filing, Zillow has unlawfully used more than 50,000 CoStar’s proprietary images across its sites, including Redfin and Realtor.com, even including the CoStar watermark on its postings. The amended complaint also alleges that Zillow reposted images it had previously claimed to remove, even after being put on notice.
CoStar General Counsel Gene Boxer stated, “Since CoStar Group filed this lawsuit in July 2025, Zillow’s infringement has only gotten worse—and increasingly brazen. Zillow infringed thousands of new CoStar copyrighted images after being sued, many plainly stamped with our watermark, bringing the total number of images at issue to more than 53,000. Even worse, after claiming to have removed the images CoStar specifically identified in its original complaint, Zillow turned around and re-published many of those very same photographs. Zillow has the tools to stop—it is simply choosing not to, hoping that its mass-infringement scheme will return a profit. We look forward to holding Zillow to account.”
Zillow responded to CoStar’s amended complaint with a statement that said, “CoStar’s decision to amend the complaint rather than respond to our motion to dismiss is yet another proof point in the weaknesses of their arguments and also a perpetual model of wastefully leveraging litigation rather than competing on the basis of product quality and consumer experience.”
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