OLDWICK, N.J.–(BUSINESS WIRE)–A.M. Best has withdrawn the Financial Strength Rating of A- (Excellent) and the Long-Term Issuer Credit Rating of “a-” of National Building Material Assurance Company (NBMA) (Indianapolis, IN). Clear Blue Specialty Insurance Company completed the acquisition of NBMA on July 23, 2018. Concurrent with the sale, the inter-company pooling agreement between NBMA and its two former affiliates, Pennsylvania Lumbermens Mutual Insurance Company and Indiana Lumbermens Mutu