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Companies Research Guide


MarketLine Company Profiles

  • Includes large private companies
  • From the library's Business Source Premier database

Company Investigator

  • Covers private and public companies of all sizes
  • From the library's Westlaw database


D&B 20M Plus Private Company Database

  • Big and small private businesses
  • International scope
  • Through the library's Mergent Online database

Secretaries of State

  • State corporate registration links

Industry Benchmarks

  • Use industry benchmarks to make financial estimates


  • Commercial website that provides some free private company data