Pennsylvania Lumbermens Mutual (PLM) is proud to be the oldest and largest mutual insurance company dedicated to the wood products and building materials industries. Looking back on the 125 years that have shaped our company and culture, we see our core mission has never changed and continues to be at the heart of our success: Providing specialized coverages to fit the unique needs of this industry and helping our policyholders better manage their everyday risk to ensure their businesses continue to flourish. (less)