Looking for Historical Stock Prices? Use New York Times and/or Wall Street Journal old issues in their archives.
NYTimes articles giving stock prices and M&A news, going back several decades, can be found in our database, Gale In Context: Opposing Viewpoints but the content is random. Search using the company name as a keyword.
The Allen County Public Library has databases of historical newspapers.
If you are unfamiliar with a company, a good place to start is the free content on D&B Hoovers. Search the company name and the results usually will reveal whether the company is public, private, or a subsidiary of another company - and give its name.
Any company whose stock is publicly owned and traded must provide investor information, and most do so right on their corporate website. Using any search engine, search [company name] corporate then find the Investor section.
Private companies sometimes provide financial information for public relations purposes, look for About Us or similar on their website
All companies whose stock is publicly traded in the United States must file financial reports with the SEC. Their most current filings will be here.
Read this Blog post from the Library of Congress explaining the research process on companies present and defunct, with links to business research resources
Find company profiles in the library's subscription database, Entrepreneurial Studies Source. Use the tab at the top of the search screen to select Company Profiles, then enter the company name. To find SWOT analyses and case studies as well as profiles, use the general search box. Enter the company name or its ticker symbol.
You can also find some company case studies on Google Scholar. Be sure to put the company's name into quotes when searching: "The Gap"
How do you know the company owns intellectual properties worth investing in? Search the United States Patent office. Use the Quick Lookup to search by company name or individual's name.