CoStar Rival Urges High Court To Reject Antitrust Appeal

By Matthew Perlman ( February 17, 2026, 6:00 PM EST) -- A rival accusing CoStar of blocking competition for commercial real estate listing services is urging the U.S. Supreme Court not to review a ruling that revived the rival's counterclaims, saying that CoStar just disagrees with how the appeals court viewed the allegations....

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