Annual reports are only available for companies that are public (meaning that they have investors and are publicly traded on a stock exchange). You can find annual reports for publicly traded companies using the D&B Hoovers online database from the list of online databases.
Search for a company by name and get a report for the company that includes an annual report option on the left side menu. Make sure that the company type listed in your company report is public parent to obtain a full company report which includes annual reports.
You will need your UNLV ACE computer account to access the D&B Hoovers online database remotely from off campus.