There have been some recent changes to the available search options on EDGAR. EDGAR is the system used for searching SEC filings. Amy Wright at Heafey Headnotes gives a nice summary of the new search capabilities of EDGAR:
The Securities and Exchange Commission recently unveiled a new search page that allows researchers to search the full text of all EDGAR filings from the past two years, including attachments. After experimenting with this search page, I recommend skipping the basic search and moving directly to the advanced search page, which gives you the option to limit your search by date, by company, by central index key, and by form type (10-K, 10-Q, etc.). For those of you who are new to legal research and aren't sure what EDGAR filings are, EDGAR stands for the SEC's "Electronic Data Gathering, Analysis, and Retrieval" system. The SEC decided to require electronic filings over a decade ago so that investors would have easy access to the most current financial information about public companies. You can find additional EDGAR search options as well as descriptions of SEC form
types on the SEC website.