The Annual Report records a company's results during the preceding year
The 10-K provides more details on products and competition
The 10-Q reviews quarterly results
The Annual Report provides a record of a company's achievements in their most recent fiscal year. (For most companies, the fiscal year ends in December.) This report is written for the benefit of the shareholders, although most companies will provide copies to potential investors if requested.
The 10-K, which is filed with the Securities and Exchange Commission, provides much of the same information. It excludes the initial letter to shareholders, but includes more extensive information on its business. You can access 10-Ks online at http://www.sec.gov/cgi-bin/srch-edgar? or by request from the company's Investor Relations Department.
The 10-Q is a review of a company's results for the preceding quarter. This review is less extensive than the Annual Report or the 10-K. You can access 10-Qs in the same manner as 10-Ks.