Companies

The Oak Brook Terrace Tower, which contains nearly 800,000 square feet of office space and houses several companies, is the tallest building in suburban Chicago, standing at 418 feet (31 stories). McDonald's Plaza, the headquarters of McDonald's, located in Oak Brook

Major companies with a strong presence in the Illinois Technology and Research Corridor include:

Ace Hardware, a hardware store chain headquartered in Oak Brook Acxiom, located in Downers Grove, is a customer and data information management company Alcatel-Lucent, an international telecommunications company, with offices in Naperville and Lisle. Aldi, a grocery store chain with U.S. headquarters in Batavia APL Logistics, a freight transportation company with offices in Oak Brook Blistex, Incorporated, a personal care products company headquartered in Oak Brook BP, an international energy company with its North American chemicals headquarters and research facilities in Naperville Calamos, an asset management firm headquartered in Naperville Caterpillar, a construction equipment manufacturer with a plant in Montgomery ConAgra Foods, a packaged foods company with offices in Naperville Coskata, Inc., an energy research company headquartered in Warrenville Devry University, an international technical college headquartered in Downers Grove Dover Corporation, a manufacturer of specialized industrial products and equipment headquartered in Downers Grove Eby-Brown, a wholesale distributor headquartered in Naperville Farm Progress, an agricultural publication publisher headquartered in St. Charles First Alert, a safety products company headquartered in Aurora Hyundai, a motor vehicle company with regional offices in Aurora McDonald's, a fast-food restaurant chain headquartered in Oak Brook MetLife, an insurance company with offices in Aurora Microsoft a computer technology company with offices in Downers Grove Mitutoyo, a company specializing in measuring instruments and meteorological technology with U.S. headquarters in Aurora Molex, an electronic components manufacturer headquartered in Lisle Nalco, a water treatment and chemical company headquartered in Naperville Navistar, an automotive manufacturer headquartered in Lisle Nicor, a gas utility company headquartered in Naperville Nissan Motors, an automotive manufacturer with offices in Aurora and Naperville Oberweis Dairy, a dairy products company headquartered in North Aurora OfficeMax, an office supplies chain headquartered in Naperville Portillo's Restaurants, a restaurant chain headquartered in Oakbrook Terrace Redbox a media rental company headquartered in Oakbrook Terrace Sanford L.P., a writing products manufacturer headquartered in Oak Brook SAP America, the Americas' subsidiary of SAP AG, the world's largest business software company with offices in Downers Grove. Sara Lee, a food company headquartered in Downers Grove Smithfield Foods, a meat products manufacturer with subsidiary Armour-Eckrich Meats headquartered in Lisle and a processing facility in St. Charles Sunshine Biscuits, a cracker, cookie, and cereal manufacturer headquartered in Elmhurst SIRVA, a moving industry company headquartered in Westmont Tellabs, a telecommunications company headquartered in Naperville Toyota Motor Sales, U.S.A., Inc., an automobile manufacturer with regional offices in Aurora and Naperville VVF, a personal care products manufacturer with a plant in Montgomery Westell, a modems manufacturer headquartered in Aurora