Look for an “About Us” page that should provide you with a history of the company. Note that this will be biased information as it is self reported by the company.
Then google the company name and “investor relations”. This will usually lead you to the company’s annual review.
A Annual Report (or Shareholder report) provides information to investors about a company’s yearly activities.
10K Form is a required document by the U.S. Securities and Exchange Commission that discusses a company’s finances. Note that only publicly traded companies are required to provide access to their financials. If you can’t find a company’s financial information, it may be a privately owned company so talk to the librarian for help.