Mergent Online is useful for finding information about specific companies. It's less useful for finding information about broad industries.
In the search box, enter company name or ticker symbol, then click on the correct company:
Click on the different tabs and links under each tab to get more information:
Under Company Financials, you can find the company's balance sheets from the past. In some cases, the data goes back decades. You can easily export the data to Excel.
Under Reports, you can find Annual Reports/10K, customizable Mergent Reports (company profile information in one document), and Broker Research Reports (analyst reports from Investext):