The following companies have headquarters within the Chicago city limits:

    * Accenture
    * Aon Corporation (Ranked #199 on the Fortune 500)
    * Bally Total Fitness
    * Boeing (Ranked #21 on the Fortune 500)
    * CareerBuilder
    * Chicago Board of Trade (pending merger with Chicago Mercantile Exchange to form CME group).
    * Chicago Board Options Exchange
    * Chicago Mercantile Exchange
    * Chicago Stock Exchange
    * Citadel Investment Group
    * Click Commerce
    * CNA Financial (an affiliate of Loews Corporation)
    * Cobra Electronics
    * Encyclopædia Britannica, Inc.
    * Equity Office Properties Trust (Ranked #493 on the Fortune 500)
    * Equity Residential Properties Trust
    * Exelon Corporation (Ranked #126 on the Fortune 500)
    * Falcon Living
    * Fellowes
    * GATX Corporation
    * General Growth Properties
    * Global Hyatt Corporation
    * Hostway
    * Integrys Energy Group, Inc.
    * Jones Lang LaSalle
    * Kerasotes Theatres
    * Metal Management
    * Midway Games
    * Morton Salt
    * National Stock Exchange
    * NAVTEQ
    * Northern Trust
    * Old Republic International (Ranked #491 on the Fortune 500)
    * Orbitz
    * Playboy Enterprises
    * Potbelly Sandwich Works
    * Quaker Oats Company, a unit of PepsiCo
    * R.R. Donnelley & Sons (Ranked #362 on the Fortune 500)
    * Ryerson, Inc.
    * Skidmore, Owings, and Merrill
    * Smurfit-Stone Container Corporation (Ranked #255 on the Fortune 500)
    * SSA Global Technologies
    * Telephone and Data Systems Incorporated
    * Tootsie Roll Industries
    * Tribune Company (Ranked #323 on the Fortune 500)
    * True Value
    * US Cellular
    * USG Corporation (Ranked #458 on the Fortune 500)
    * Unitrin (S&P 400 MidCap, S&P 1500 Super Comp)
    * Whittman-Hart
    * World Book
    * WM. Wrigley Jr. Company

The following companies are based in Chicago's suburbs:

    * Abbott Laboratories (Abbott Park, Illinois) (Fortune 500)
    * ACCO Brands (Lincolnshire, Illinois)
    * Ace Hardware (Oak Brook, Illinois)
    * ACNielsen (Schaumburg, Illinois)
    * Allstate (Northbrook, Illinois) (Fortune 500)
    * Andrew Corporation (Westchester, Illinois)
    * Anixter International (Glenview, Illinois)
    * Azteca Foods (Summit, Illinois)
    * Baxter International (Deerfield, Illinois) (Fortune 500)
    * BFG Technologies (Lake Forest, Illinois)
    * Brunswick Corporation (Lake Forest, Illinois) (Fortune 500)
    * Calamos Holdings LLC (Naperville, Illinois)
    * Career Education Corporation (Hoffman Estates, Illinois)
    * CDW (Vernon Hills, Illinois) (Ranked #376 on the Fortune 500)
    * Corn Products International (Westchester, Illinois)
    * Così (Deerfield, Illinois)
    * Crate and Barrel (Northbrook, Illinois)
    * Dade Behring (Deerfield, Illinois)
    * DeVry University (Oakbrook Terrace, Illinois)
    * Discover Card (Riverwoods, Illinois; a subsidiary of Morgan Stanley until September 2007)
    * Donlen Corporation (Northbrook, Illinois)
    * Electro-Motive Diesel (McCook, Illinois)
    * Fortune Brands (Jim Beam, Courvoisier, Titleist, and many other brands) (Lincolnshire, Illinois) (Fortune 500)
    * Hendrickson Int'l Corp. (Lemont, Illinois; a subsidiary of The Boler Company (Itasca, Illinois))
    * Hewitt Associates (Lincolnshire, Illinois) (Fortune 500)

    * Hospira (Lake Forest, Illinois)
    * Illinois Tool Works (Glenview, Illinois) (Fortune 500)
    * Kraft Foods (Northfield, Illinois)
    * Laidlaw (Naperville, Illinois) (Fortune 500)
    * McDonald's Corporation (Oak Brook, Illinois) (Fortune 500)
    * Molex (Lisle, Illinois)
    * Motorola (Schaumburg, Illinois) (Fortune 500)
    * Nalco Holding Company (Naperville, Illinois)
    * Namco Cybertainment (Bensenville, Illinois; a subsidiary of Japan-based Namco)
    * Navistar International Corporation (Warrenville, Illinois) (Fortune 500)
    * Nicor (Naperville, Illinois) (S&P 500)
    * NiSource (Merrillville, Indiana) (Fortune 500)
    * Northfield Laboratories (Evanston, Illinois)
    * OfficeMax (Naperville, Illinois)
    * Pactiv (Lake Forest, Illinois)
    * Portillo's Restaurants (Oakbrook Terrace, Illinois)
    * Rand McNally (Skokie, Illinois), a subsidiary of Quebecor World
    * Redbox Automated Retail, LLC (Oakbrook Terrace, Illinois)
    * Salton Inc. (Lake Forest, Illinois)
    * Sanford (Oak Brook, Illinois; a division of Newell Rubbermaid)
    * Sara Lee (Downers Grove, Illinois) (Fortune 500)
    * Sears Holdings (Hoffman Estates, Illinois) (Fortune 500)
    * ServiceMaster (Downers Grove, Illinois) (Fortune 500)
    * Shure Incorporated (Niles, Illinois)
    * Solo Cup Company (Highland Park, Illinois)
    * Stepan Company (Northfield, Illinois; NYSE: SCL)
    * TAP Pharmaceuticals (Lake Forest, Illinois)
    * Tellabs (Naperville, Illinois)

The Chicago area, a center of global transportation, serves as the headquarters for airline manufacturer Boeing, commercial airline United Airlines, and a number of major trucking companies.
The Chicago area, a center of global transportation, serves as the headquarters for airline manufacturer Boeing, commercial airline United Airlines, and a number of major trucking companies.

    * Tenneco (Lake Forest, IL) (Fortune 500)
    * Turtle Wax (Willowbrook, Illinois)
    * Underwriters Laboratories (Northbrook, Illinois)
    * United Airlines (Elk Grove Village, Illinois) (Fortune 500)
    * United Stationers (Des Plaines, Illinois) (Fortune 500)
    * USRobotics (Schaumburg, Illinois)
    * Vanee Foods Company, Inc. (Berkeley, Illinois)
    * Van Kampen Investments (Oakbrook Terrace, Illinois)
    * Walgreens (Deerfield, Illinois) (Fortune 500)
    * Westell (Aurora, Illinois)
    * WMS Gaming (Waukegan, Illinois)
    * World Dryer (Berkeley, Illinois; a subsidiary of Carrier Commercial Refrigeration)
    * W.W. Grainger (Lake Forest, Illinois) (Fortune 500)
    * Zebra Technologies (Vernon Hills, Illinois)
    * Zenith Electronics Corporation (Lincolnshire, Illinois; a subsidiary of South Korea-based LG Electronics)

There are other large corporations with an established presence in Chicago and/or its suburbs (but whose corporate headquarters are located elsewhere), including:

    * ABN AMRO (LaSalle Bank division)
    * Acxiom (Downers Grove, Illinois)
    * ACS (Schaumburg, Illinois) (Fortune 500)
    * ALDI (U.S. headquarters: Batavia, Illinois)
    * Akzo Nobel (Polymer Chemicals Unit)
    * Astellas Pharma (Deerfield, Illinois)
    * AT&T
    * BP (Warrenville, Illinois)
    * Caterpillar Inc. (Montgomery, Illinois)
    * ConAgra (Downers Grove, Illinois)
    * Continental Automotive Systems (Temic) (Deer Park, Illinois)
    * CSX Transportation (Northern Region Operations Center) (Calumet City, Illinois)
    * FANUC Robotics (Hoffman Estates, Illinois)
    * Fitch Ratings
    * Ford Motor Company (Chicago Assembly, Chicago Heights Stamping)
    * GE
    * Goldman Sachs
    * HSBC Finance, a subsidiary of HSBC (Prospect Heights, Illinois)
    * IBM
    * JPMorgan Chase & Co. (See: Bank One)
    * Lucent Technologies
    * McKesson (Wheeling, Illinois)
    * McGraw-Hill Companies (Chicago Loop)
    * Microsoft Corporation (Chicago Loop; Downers Grove, Illinois)
    * Mintel
    * Mitsubishi Electric (Mitsubishi Electric Automation, Inc.) (Vernon Hills, Illinois)
    * Mittal Steel Company (U.S. headquarters: Chicago Loop; plants in Riverdale, Illinois, East Chicago, Indiana, and Burns Harbor, Indiana)
    * NEC (NEC Display Solutions of America) (Itasca, Illinois)
    * Northrop Grumman Electronic Systems (Rolling Meadows, Illinois)
    * Omron (Schaumburg, Bannockburn, St. Charles)
    * Panasonic Corporation of North America (Panasonic Factory Solutions Company of America) (Buffalo Grove, Illinois)
    * Pearson Education, publishing as Scott Foresman (Glenview, Illinois)
    * PepsiAmericas (corporate offices) (Schaumburg, Illinois)
    * Popular, Inc. (Banco Popular North America) (Rosemont, Illinois)
    * Rexam
    * Robert Bosch Corp. (Broadview, Illinois; Mount Prospect, Illinois)
    * SAP AG (Westchester, Illinois)
    * Schneider Electric (Palatine, Illinois)
    * Siemens Medical Solutions (Hoffman Estates, Illinois)
    * STMicroelectronics (Schaumburg, Illinois)
    * Takeda Pharmaceutical Company (U.S. headquarters: Deerfield, Illinois)
    * Teradyne (Broadband Test Division) (Deerfield, Illinois)
    * UBS AG
    * Unilever (Home & Personal Care North America) (Chicago)
    * UPS (CACH) (Hodgkins, Illinois)
    * UOP LLC, a subsidiary of Honeywell (Des Plaines, Illinois)
    * Yaskawa Electric America (Waukegan, Illinois)
    * ZF Friedrichshafen (Vernon Hills, Illinois)
    * Zurich Financial Services (Schaumburg, Illinois)