Starting July 7, 2025, a new Rule 23 will take effect in the Commercial Division of the New York Supreme Court, authorizing the filing of amicus curiae briefs for the first time in trial-level proceedings. This important development further cements the Commercial Division’s role—both statewide and here in Westchester—as a forward-thinking venue for resolving sophisticated business disputes.
The new rule, adopted by Administrative Order of Chief Administrative Judge Joseph A. Zayas, allows non-parties to seek leave to submit amicus briefs by motion, typically brought on by order to show cause. The movant must file the proposed brief with its motion and make specified disclosures regarding its interest in the matter and any involvement by the parties or third parties in the brief’s preparation or funding. The court may deny the motion if it would cause judicial recusal or undue delay.
The rule was proposed by the Commercial Division Advisory Council, which noted that, unlike appellate courts, trial courts generally lack formal procedures for considering amicus briefs. The Council emphasized that the Commercial Division’s unique docket—regularly featuring high-stakes and precedential commercial matters—makes it especially well-suited for a rule encouraging thoughtful input from outside stakeholders.
As the Advisory Council explained, Rule 23 will “distinguish the Commercial Division from other trial courts and build upon its reputation as a leading and innovative court for resolving significant litigation.”
In Westchester, where the Commercial Division is overseen by Justices Linda Jamieson and Gretchen Walsh, the new rule provides a clear mechanism for industry groups, bar associations, and other interested entities to weigh in on cases that may have broader business implications. It also reflects the continued evolution of the Commercial Division into a model of specialized, efficient, and transparent judicial administration.
For litigants and practitioners in Westchester, Rule 23 opens the door to more robust legal discourse and may offer valuable support in cases that raise novel or complex legal questions. As the Commercial Division continues to innovate, this latest addition further enhances its standing as a national leader in commercial adjudication.
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