On November 13, 2025, the Intermediate Court of Appeals of West Virginia issued a decision in the dispute between Westlake Chemical Corporation and Axiall Corporation and a group of commercial insurers, including National Union, Allianz, ACE, Zurich, Great Lakes, XL, and others. The case arose from a 2016 chlorine spill at Westlake’s Natrium Plant, after a repaired railroad tank car ruptured and released a large quantity of chlorine, causing significant damage at the facility.