Ward's business directory of U.S. private and public companies - See description above . Volume 5 arranges companies by SIC code and ranks them according to sales volume. You can estimate market share within SIC code by comparing a company's totals with the SIC total. The 1997 eition has 2000 entries arranged by 462 SIC codes. Gives corporate, brand, product, service and commodity market share.
Information varies for each type of product.
Bureau of Economic Analysis. Reports on business activity and general economic conditions. Charts highlights of the current situation. A statistical supplement includes a large number of statistical series grouped by category. An important resource for current information .