A Manhattan Supreme Court justice has dramatically downsized a lawsuit in which plaintiffs claimed that workers’ compensation insurers and their trade organization engaged in an “industry-wide” conspiracy to artificially inflate premiums charged to policyholders.

The decision by Justice Ira Gammerman, dated July 14 and released this week, leaves standing only causes of action for breach of contract against 12 insurance companies that actually wrote policies for the 17 plaintiffs in the lawsuit.