The annual reports of publicly traded companies are also called 10-K's. 10-K is the form which is required from all publicly traded companies by the Securities and Exchange Commission (SEC). Often, a company's most current annual report can be found on their website. Look for links like "Investors" or "About Us" then "Annual Reports" or "SEC Filings."
You can also use the following resources to obtain annual reports. Depending on your need and preference, some resources may be more useful than others.