A federal judge in Pennsylvania has ruled that California law applies to state law antitrust claims against the remaining defendants in a national litigation over drywall price-fixing.

U.S. District Judge Michael Baylson of the Eastern District of Pennsylvania on Monday denied a motion for summary judgment by defendants PABCO Building Products, United States Gypsum Co. and L&W Supply Corp. on the homebuilder plaintiffs’ California-based claims against them.