• Directories of U.S. and International Companies
• Regional Directories
• Other Specialized Directories
• Consulting and Research Firms

• Company Search in Business & Company Resource Center - quick company profiles, and then use the tabs at the top of the main page for each company to find news articles, investment reports, rankings, market share, product listings, and excellent company histories.
  
• Hoover's Guides give overviews, key financial figures and lists of products and competitors in one easy-to-locate source. 
  
• LexisNexis Academic's Company Dossier will get you many kinds of company data from various sources: quick snapshots, corporate hierarchy, financials, legal cases, executives, analysts' reports, etc.
   
• MarketLine has detailed reports on public and private companies, internationally, including background, analysis and forecasts, and featuring SWOT analyses, from the international research firm Datamonitor.
  
• Mergent Online - best for financial and securities data for public companies worldwide, as well as an outline of operations, plants, and subsidiaries.
  
• Value Line Investment Survey, Hunt Reference Room 332.63 V21 - frequently updated one-page summaries, with analysts' reports, financial data, forecasts and ratings, for about 1600 stocks in 80 industries.

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• U.S. and International Companies
  
• Million Dollar Database from Dun & Bradstreet - covers approximately 255,000 U.S. public and private businesses in all industries, is searchable many ways, and allows the creation of downloadable lists.
  
• Principal International Businesses from Dun and Bradstreet, Hunt Reference Desk on CD-ROM - provides information on approximately 50,000 leading companies worldwide.
  
• Standard & Poor's Register of Corporations, Directors and Executives, Hunt Reference Desk 332.6058 P82p - is an alphabetical list, with SIC and geographical indexes, of about 36,000 U.S. and Canadian corporations, giving officers, products, sales range, etc.
  
• Ward's Business Directory of US Private and Public Companies, Hunt Reference Desk 670.2 W2663 - rank the major U.S. public and private companies within industry by industry (SIC code) and then by sales. Other tables rank the companies by zip code (geographical) order, states, cities, and trading design. An alphabetical listing is also provided. (This same data can be found in the Company section of Business & Company Resource Center database.)

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• Specialized Directories 
  
• Dun & Bradstreet's Regional Business Directory on CD-ROM, Hunt Reference Desk - contains brief information about companies both large and small in Pittsburgh and surrounding counties.
  
• Pennsylvania Industrial Directory, Harris InfoSource - Hunt Reference collection 330.9748 H313 - specializes in companies with manufacturing operations located in Pennsylvania, containing company profiles, contacts, employment, product lists, and sales data. 
  
• Pittsburgh Technology Council Membership Directory - also in print in Hunt Reference collection 620.0025 P69MA - is a membership directory of companies belonging to the Pittsburgh Technology Council, with contact data and background information.
  
• CorpTech Directory of Technology Companies - provides profiles of thousands of public and private companies in hundreds of specialized technology areas.
  
• Directory of American Firms Operating in Foreign Countries and
Directory of Foreign Firms Operating in the United States - Hunt Reference collection 338.88 D59 - tell which firms have operations in another country: American firms that have subsidiaries and affiliates in other countries, and foreign companies with operations in the U.S.


• Directory of Corporate Affiliations - Hunt reference collection 658.1 D59A - extensive basic company information for US public and private and international companies, but particularly valuable for giving an outline of corporate structure, subsidiaries and holdings.
  
• Thomas Register - and also in print in Hunt Reference collection 670.2 T45 - has been the standard American directory of manufacturers, encompassing all types of manufacturing companies and products.
  

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• Consulting and Research Firms 
  
  
• Community of Science Expertise - provides profiles and contact information for researchers from member universities, government agencies, and other R&D organizations worldwide. Members can be located by institution, research interest, or geographic location. 
  
• Consultants & Consulting Organizations Directory - Hunt Reference collection 658.46 C75 - describes more than 22,000 concerns and individuals working as consultants for business, industry, and government, indexed by firm name, consulting activity, and geographic location. 
  
• Dun & Bradstreet's Consultants Directory, searchable in the Million Dollar Database (described above) - has listings of 10,000+ consulting firms representing areas of specialization in finance, business management, marketing, engineering design and data processing.
  

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There is considerable overlap among these databases, but also many unique items in each one:

• Proquest – wide-ranging news database containing many smaller databases within it - a great place to search for local reporting on a company, and uncovering what competitors are doing.
• Business & Company Resource Center – articles here are international, very thorough coverage
• Lexis-Nexis Academic– has wide-ranging news and press releases; also special sections: mergers and acquisitions, biographical background on individuals and legal cases.

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• SEC EDGAR database -all US public companies and some foreign ones must file their financial reports here; this is the most direct source.
• Mergent Online database -financial data and segments thereof can be displayed and downloaded more conveniently than from the SEC site.
For historical financial data from companies:
• Moody's Manuals - financial and securities data for US and international public companies, from 1914, Hunt reference collection microfiche.
• ProQuest Historical Annual Reports - pdf's of annual reports of 800 US companies, with coverage ranging from 1844 to the present.