Archives (some portions all the way back to 1979) for 14 key business ratios (solvency, efficiency, profitability) for public and private companies in 800 lines of business in order by SIC code. This information is available in PDF chapters by industry or SIC code.
The D&B Industry Norms and Key Business Ratios are made possible through over one million financial statements in the D&B Financial Information Base. This file consists of U.S. corporations, partnerships and proprietorships both public and privately owned, in all size ranges, and includes over 800 different lines of business as defined by the U.S. Standard industrial Classification (SIC) code numbers. Their data is collected weekly, maintained daily, and constantly edited and updated.