Grant Thornton Grant Thornton LLP is the U.S. member firm of Grant Thornton International, one of the six global accounting, tax and business advisory organizations. Through member firms in 111 countries, including 50 offices in the United States, the partners and employees of Grant Thornton member firms provide personalized attention and the highest quality service to public and private clients around the globe. Grant Thornton LLP is the U.S. member firm of Grant Thornton International, one of the six global accounting, tax and business advisory organizations. Through member firms in 111 countries, including 50 offices in the United States, the partners and employees of Grant Thornton member firms provide personalized attention and the highest quality service to public and private clients accountingassuranceauditbigcorporatefinancefinancialfourglobalgrantlocalmanufactureportingsaltstatetaxthornton in Search Links > CIwith firmgrantinternationalllpmembersearchthorntonu.s