Using 2001 revenues, the Grant Thornton Accounting Firm ranked the state's 100 private companies for BUSINESS NORTH CAROLINA. Companies doing business mainly in finance, real estate, retail, or healthcare do not qualify for the list. Twenty-one companies made their first appearance or returned after at least one year's absence. General Parts, Inc., of Raleigh, a distributor of replacement parts for vehicles, retained its No. 1 ranking from 2001.