National Specialty Insurance Company (NSIC), part of the Markel, has filed revisions to its Thimble Business Program in New York, submitted on March 13, 2025, under SERFF Tracking Number STNA-134398005. The filing, acknowledged by the New York Department of Financial Services on March 17, 2025, incorporates new forms and rules to address PFAS (per- and polyfluoroalkyl substances) exposure as outlined in ISO Reference Filing GL-2022-OFR22.

This form/rule filing affects NSIC’s Commercial Multi-Peril (CMP) Liability and Non-Liability lines, with the new forms effective March 19, 2025 for new business and May 15, 2025 for renewals. NSIC did not propose changes to rates in this filing.

These changes reflect the insurer’s effort to clarify coverage in response to the growing environmental and legal concerns surrounding PFAS, which have been dubbed “forever chemicals” due to their persistence in the environment and increasing regulatory scrutiny.