Pennsylvania Lumbermens Mutual is a property and casualty insurance carrier based in Philadelphia, PA, which serves the lumber, woodworking and building material industries from around the country. PLM carries an A.M. Best rating of A- (Excellent) and has been providing insurance for more than 120 years. The company says it insures more than 5,000 businesses nationwide with property, general liability, inland marine, business automobile, commercial excess liability and equipment breakdown coverages.