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As you research, keep these categories in mind. Each set of sources has different things to tell you about your chosen company.
Newspapers and news sites: Latest news and current trends
Company rankings and lists: Identifying companies of interest
Directories, initial filings, corporate websites: Basic information about companies, such as physical addresses, key personnel, company history, organizational structure
Annual reports, SEC filings, analyst reports: In-depth analysis and detailed information on company activities
Industry overviews and government data: The broader business, industry, and economic context
NAICS and SIC
NAICS and SIC are coding systems for industries. Company and industry information is often organized according to this system, especially government information. You may find it helpful to look up your company's NAICS and/or SIC codes to aid you in your search.