Ward's Business Directory of U.S. Private and Public Companies now lists more than 105,000 companies, 90% of which are private. Volume 5 offers national rankings by sales within SIC codes at the 4-digit level, and provides the total number of companies, sales, and employees for each SIC and NAICS industry-the data needed to estimate market share more precisely than in other business directories. This product is also available on GDL.