Illinois is home to some of the largest and most influential companies in the United States.
With a diverse array of industries, including finance, manufacturing, healthcare, and transportation, the state has cultivated a thriving business environment.
The 35 largest companies in Illinois not only have a significant impact on the state’s economy but also play a crucial role in the national and global markets.
These companies employ thousands of individuals and generate substantial revenue, making them key players in the business world.
In this article, we will explore the top 35 companies that have made a mark in Illinois, examining their contributions to the local and national economy and delving into the unique factors that have propelled them to the top of their respective industries.
1. Boeing
Background: Boeing is a multinational corporation that designs, manufactures, and sells airplanes, rotorcraft, rockets, satellites, and telecommunications equipment.
Founded in 1916, Boeing has grown into one of the world’s largest aerospace manufacturers and defense contractors.
The company is headquartered in Chicago, Illinois, and operates globally, serving commercial airline customers, defense agencies, and space exploration initiatives.
Core Industries: Aerospace, Defense, Technology, Engineering
Key Achievements: Boeing has a rich history of innovation and leadership in the aerospace industry.
The company’s iconic aircraft models, such as the Boeing 737, 747, 777, and 787 Dreamliner, have revolutionized air travel worldwide.
Boeing’s contributions to space exploration include the development of spacecraft, satellites, and the International Space Station modules.
With a commitment to excellence and cutting-edge technology, Boeing continues to shape the future of aviation and defense.
2. Archer Daniels Midland (ADM)
Background: Archer Daniels Midland (ADM) is a global food processing and commodities trading corporation headquartered in Chicago, Illinois.
Founded in 1902, ADM operates in various sectors, including agriculture, transportation, and logistics.
The company processes crops such as corn, soybeans, wheat, and cocoa into ingredients for food, animal feed, industrial, and energy uses.
Core Industries: Food Processing, Commodities Trading, Agriculture, Logistics
Key Achievements: ADM has a significant presence in the food and agriculture industries, serving customers worldwide with a diverse range of products and services.
The company’s strategic acquisitions, investments in research and development, and commitment to sustainability have reinforced its position as a leader in the global food supply chain.
3. Caterpillar Inc.
Background: Caterpillar Inc. is a multinational corporation that designs, manufactures, markets, and sells machinery, engines, financial products, and insurance to customers in construction, mining, agriculture, forestry, and other industries.
Founded in 1925, Caterpillar is headquartered in Deerfield, Illinois, and operates globally through a network of dealers and distributors.
Core Industries: Construction, Mining, Agriculture, Forestry, Industrial Equipment
Key Achievements: Caterpillar’s durable and reliable equipment has played a vital role in infrastructure development and resource extraction projects worldwide.
The company’s focus on innovation, quality, and customer support has earned it a reputation for excellence in the heavy equipment industry.
4. Walgreens Boots Alliance
Background: Walgreens Boots Alliance is a multinational retail pharmacy chain and pharmaceutical wholesaler.
Formed in 2014 through the merger of Walgreens and Alliance Boots, the company operates thousands of retail pharmacies across the United States, Europe, and other international markets.
Headquartered in Deerfield, Illinois, Walgreens Boots Alliance provides a wide range of health and wellness products and services.
Core Industries: Retail Pharmacy, Healthcare, Pharmaceuticals, Wholesale Distribution
Key Achievements: Walgreens Boots Alliance is a trusted provider of pharmacy services and healthcare products, serving millions of customers each day.
The company’s commitment to accessible and affordable healthcare, along with its innovative retail offerings, has solidified its position as a leader in the global pharmacy industry.
5. AbbVie Inc.
Background: AbbVie Inc. is a multinational biopharmaceutical company that develops and markets drugs for various therapeutic areas, including immunology, oncology, neuroscience, and virology.
Founded in 2013 as a spin-off from Abbott Laboratories, AbbVie is headquartered in North Chicago, Illinois, and operates globally.
The company’s flagship product is Humira, a medication used to treat autoimmune diseases.
Core Industries: Biopharmaceuticals, Healthcare, Pharmaceuticals, Research & Development
Key Achievements: AbbVie has achieved significant success in bringing innovative treatments to market, improving the lives of patients worldwide.
The company’s pipeline of promising drug candidates, combined with its strategic partnerships and commitment to scientific excellence, positions it for continued growth and impact in the healthcare industry.
6. United Continental Holdings (United Airlines)
Background: United Continental Holdings, Inc., commonly known as United Airlines, is a major American airline headquartered in Chicago, Illinois.
Formed in 2010 through the merger of United Airlines and Continental Airlines, the company operates a vast network of domestic and international flights, serving millions of passengers each year.
Core Industries: Airline, Aviation, Transportation, Travel
Key Achievements: United Airlines is known for its extensive route network, modern fleet of aircraft, and commitment to customer service and safety.
The company’s innovative initiatives, such as sustainable aviation fuel and carbon offset programs, demonstrate its dedication to environmental stewardship and corporate responsibility.
7. Exelon Corporation
Background: Exelon Corporation is a Fortune 100 energy company headquartered in Chicago, Illinois.
Formed in 2000 through the merger of PECO Energy Company and Unicom Corporation, Exelon operates a diverse portfolio of energy generation and distribution assets, including nuclear, wind, solar, and natural gas facilities.
Core Industries: Energy, Utilities, Power Generation, Renewable Energy
Key Achievements: Exelon is one of the largest clean energy producers in the United States, with a strong commitment to sustainability and environmental stewardship.
The company’s nuclear fleet provides reliable, low-carbon electricity to millions of customers, helping to reduce greenhouse gas emissions and combat climate change.
8. McDonald’s Corporation
Background: McDonald’s Corporation is a global fast-food restaurant chain that operates thousands of locations worldwide.
Founded in 1940 by Richard and Maurice McDonald, McDonald’s is headquartered in Chicago, Illinois, and is known for its iconic golden arches logo and signature menu items such as the Big Mac and the Quarter Pounder.
Core Industries: Fast Food, Restaurant, Franchising, Hospitality
Key Achievements: McDonald’s is one of the most recognizable and successful brands in the world, with a presence in over 100 countries.
The company’s innovative marketing campaigns, commitment to quality and convenience, and focus on customer satisfaction have contributed to its enduring popularity and financial success.
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9. State Farm Insurance
Background: State Farm Insurance is a mutual insurance company that offers a wide range of insurance and financial services products.
Founded in 1922 by retired farmer George Jacob “G.J.” Mecherle, State Farm is headquartered in Bloomington, Illinois, and operates as a mutual company owned by its policyholders.
Core Industries: Insurance, Financial Services
Key Achievements: State Farm is one of the largest property and casualty insurance providers in the United States, known for its comprehensive coverage options and personalized customer service.
The company’s strong financial stability and commitment to community involvement have earned it the trust and loyalty of millions of policyholders nationwide.
10. Illinois Tool Works (ITW)
Background: Illinois Tool Works Inc. (ITW) is a multinational industrial manufacturing company headquartered in Glenview, Illinois.
Founded in 1912, ITW operates through a decentralized structure, with over 80 divisions serving diverse end markets such as automotive, construction, food equipment, and healthcare.
Core Industries: Industrial Manufacturing, Engineering, Automotive, Construction
Key Achievements: ITW is known for its innovative approach to product design, manufacturing processes, and customer solutions.
The company’s decentralized business model fosters entrepreneurship and innovation, allowing its divisions to respond quickly to market needs and deliver value to customers.
11. Mondelez International
Background: Mondelez International is a multinational confectionery, food, and beverage company headquartered in Deerfield, Illinois.
Formed in 2012 as a spin-off from Kraft Foods Inc., Mondelez owns iconic brands such as Oreo, Cadbury, Toblerone, and Trident.
Core Industries: Food Processing, Confectionery, Snack Foods, Beverages
Key Achievements: Mondelez is a global leader in the snacking industry, with a portfolio of beloved brands enjoyed by consumers around the world.
The company’s focus on innovation, marketing excellence, and sustainability underscores its commitment to delivering delicious, high-quality products while minimizing its environmental impact.
12. Allstate Corporation
Background: The Allstate Corporation is one of the largest insurance providers in the United States, offering a range of insurance products, including auto, home, life, and business insurance.
Founded in 1931, Allstate is headquartered in Northfield Township, Illinois, and operates through multiple subsidiaries and affiliates.
Core Industries: Insurance, Financial Services
Key Achievements: Allstate is known for its innovative insurance products, personalized customer service, and commitment to safety and security.
The company’s emphasis on risk management, technology integration, and community engagement has helped it build trust and loyalty with policyholders nationwide.
13. Northern Trust Corporation
Background: Northern Trust Corporation is a leading provider of wealth management, asset servicing, asset management, and banking solutions for individuals, families, and institutions worldwide.
Founded in 1889, Northern Trust is headquartered in Chicago, Illinois, and operates in over 40 countries.
Core Industries: Banking, Wealth Management, Asset Servicing, Asset Management
Key Achievements: Northern Trust is renowned for its commitment to excellence, integrity, and personalized service in the financial industry.
The company’s global presence, innovative solutions, and long-term perspective have earned it the trust of clients and investors around the world.
14. Conagra Brands
Background: Conagra Brands is a multinational food corporation headquartered in Chicago, Illinois. Founded in 1919, Conagra owns a diverse portfolio of popular food brands, including Marie Callender’s, Healthy Choice, Banquet, Slim Jim, and Reddi-wip.
Core Industries: Food Processing, Consumer Packaged Goods
Key Achievements: Conagra Brands is a leader in the packaged food industry, known for its portfolio of trusted brands and innovative product offerings.
The company’s focus on consumer preferences, culinary expertise, and sustainable practices underscores its commitment to nourishing and delighting consumers around the world.
15. Discover Financial Services
Background: Discover Financial Services is a leading direct banking and payment services company headquartered in Riverwoods, Illinois.
Founded in 1985, Discover operates multiple business segments, including credit cards, personal loans, student loans, and payment processing services.
Core Industries: Banking, Financial Services, Payment Processing
Key Achievements: Discover is known for its innovative financial products, customer-friendly policies, and commitment to transparency and value.
The company’s emphasis on technology, data analytics, and customer service has helped it build a loyal customer base and drive growth in the competitive financial services industry.
16. Ingredion Incorporated
Background: Ingredion Incorporated is a multinational ingredient solutions company headquartered in Westchester, Illinois.
Formerly known as Corn Products International, the company rebranded as Ingredion in 2012 to reflect its expanded portfolio of ingredients beyond corn-based products.
Core Industries: Food Ingredients, Starches, Sweeteners, Nutrition
Key Achievements: Ingredion is a trusted partner to food and beverage manufacturers worldwide, providing innovative ingredient solutions that enhance taste, texture, and nutritional value.
The company’s focus on sustainability, quality, and customer collaboration has earned it a reputation for excellence in the food ingredients industry.
17. Deere & Company
Background: Deere & Company, commonly known as John Deere, is a multinational corporation that manufactures agricultural, construction, and forestry machinery, diesel engines, drivetrains, and lawn care equipment.
Founded in 1837 by John Deere, the company is headquartered in Moline, Illinois, and operates globally.
Core Industries: Agriculture, Construction, Forestry, Machinery
Key Achievements: John Deere is a global leader in the agriculture and construction equipment industry, known for its innovative products, advanced technology, and commitment to sustainability.
The company’s iconic green and yellow equipment is synonymous with quality, reliability, and productivity on farms and job sites around the world.
18. Ventas Inc.
Background: Ventas, Inc. is a real estate investment trust (REIT) that owns, manages, and develops healthcare and senior living properties.
Founded in 1998, Ventas is headquartered in Chicago, Illinois, and operates a diverse portfolio of properties across the United States, Canada, and the United Kingdom.
Core Industries: Real Estate, Healthcare, Senior Living
Key Achievements: Ventas is a leading provider of high-quality real estate solutions for the healthcare industry, serving a growing population of seniors and healthcare consumers.
The company’s strategic investments, disciplined capital allocation, and focus on operational excellence have generated value for shareholders and stakeholders alike.
19. Kraft Heinz Company
Background: The Kraft Heinz Company is a multinational food and beverage corporation formed by the merger of Kraft Foods Group and H.J. Heinz Company in 2015.
Headquartered in Chicago, Illinois, Kraft Heinz owns a diverse portfolio of iconic brands, including Kraft, Heinz, Oscar Mayer, and Planters.
Core Industries: Food Processing, Consumer Packaged Goods
Key Achievements: Kraft Heinz is a global leader in the food and beverage industry, known for its portfolio of beloved brands and household favorites.
The company’s focus on product innovation, marketing excellence, and operational efficiency has enabled it to maintain a strong market position and drive growth in a competitive landscape.
20. Tenneco Inc.
Background: Tenneco Inc. is a multinational automotive components company that designs, manufactures, and markets products for vehicle manufacturers and aftermarket customers worldwide.
Founded in 1940, Tenneco is headquartered in Lake Forest, Illinois, and operates through two primary business segments: Clean Air and Powertrain.
Core Industries: Automotive, Manufacturing, Engineering
Key Achievements: Tenneco is a trusted partner to automotive manufacturers and aftermarket customers, providing innovative solutions for emissions control, ride performance, and powertrain systems.
The company’s commitment to quality, technology, and sustainability has earned it recognition as a leader in the global automotive components industry.
21. Discover Financial Services
Background: Discover Financial Services is a leading direct banking and payment services company headquartered in Riverwoods, Illinois.
Founded in 1985, Discover operates multiple business segments, including credit cards, personal loans, student loans, and payment processing services.
Core Industries: Banking, Financial Services, Payment Processing
Key Achievements: Discover is known for its innovative financial products, customer-friendly policies, and commitment to transparency and value.
The company’s emphasis on technology, data analytics, and customer service has helped it build a loyal customer base and drive growth in the competitive financial services industry.
22. Motorola Solutions Inc.
Background: Motorola Solutions Inc. is a multinational telecommunications company that provides mission-critical communication solutions for public safety and commercial customers worldwide.
Founded in 1928, Motorola Solutions is headquartered in Chicago, Illinois, and operates through two primary business segments: Products and Systems Integration, and Services and Software.
Core Industries: Telecommunications, Public Safety, Technology
Key Achievements: Motorola Solutions is a trusted provider of communication solutions for first responders, law enforcement agencies, and enterprises, enabling them to communicate effectively and safely in challenging environments.
The company’s innovative products, software solutions, and services support mission-critical operations and help protect communities and businesses.
23. Old Republic International Corporation
Background: Old Republic International Corporation is a multinational insurance company that offers a wide range of insurance products and services, including property and casualty insurance, title insurance, and mortgage guaranty insurance.
Founded in 1923, Old Republic is headquartered in Chicago, Illinois, and operates through multiple subsidiaries and affiliates.
Core Industries: Insurance, Financial Services
Key Achievements: Old Republic is known for its financial strength, stability, and long-term commitment to policyholders and stakeholders.
The company’s diversified portfolio of insurance businesses, disciplined underwriting practices, and conservative investment approach have enabled it to weather economic cycles and deliver value to shareholders over the years.
24. CDW Corporation
Background: CDW Corporation is a leading provider of technology products and services for business, government, education, and healthcare organizations.
Founded in 1984, CDW is headquartered in Lincolnshire, Illinois, and operates through a network of sales offices and distribution centers across North America and the United Kingdom.
Core Industries: Technology, Information Technology, Solutions Provider
Key Achievements: CDW is a trusted partner to organizations of all sizes, offering a wide range of technology products, services, and solutions to meet their evolving needs.
The company’s focus on customer relationships, technical expertise, and solution integration has earned it recognition as a premier provider of IT solutions and services.
25. Jones Lang LaSalle Incorporated (JLL)
Background: Jones Lang LaSalle Incorporated (JLL) is a leading professional services firm that specializes in real estate and investment management.
Founded in 1783, JLL is headquartered in Chicago, Illinois, and operates in over 80 countries, providing a wide range of services, including leasing, property management, valuation, and investment advisory.
Core Industries: Real Estate, Property Management, Investment Management
Key Achievements: JLL is a trusted advisor to investors, property owners, and occupiers, helping them maximize the value of their real estate assets and achieve their business objectives.
The company’s global presence, market intelligence, and innovative solutions have made it a preferred partner in the dynamic and competitive real estate industry.
26. Equity Residential
Background: Equity Residential is a real estate investment trust (REIT) that owns, develops, and manages multifamily properties in urban and high-density suburban markets.
Founded in 1969, Equity Residential is headquartered in Chicago, Illinois, and operates a diverse portfolio of apartment communities across the United States.
Core Industries: Real Estate, Multifamily Housing, Property Management
Key Achievements: Equity Residential is a leading provider of high-quality rental housing, offering residents exceptional amenities, services, and community environments.
The company’s focus on urban infill locations, sustainable development practices, and resident satisfaction has enabled it to create long-term value for investors and stakeholders.
27. CME Group
Background: CME Group Inc. is a global derivatives marketplace that facilitates the trading of futures contracts and options on futures, as well as cash and OTC markets.
Founded in 1898 as the Chicago Butter and Egg Board, CME Group is headquartered in Chicago, Illinois, and operates trading platforms for a wide range of asset classes, including equities, commodities, currencies, and interest rates.
Core Industries: Financial Services, Derivatives Trading, Exchange Operator
Key Achievements: CME Group is a leader in the global derivatives industry, providing market participants with efficient and transparent trading and risk management solutions.
The company’s diverse product offerings, robust technology infrastructure, and global reach have made it a preferred venue for hedging and speculation in financial markets worldwide.
28. SC Johnson & Son
Background: SC Johnson & Son, Inc. is a multinational consumer goods company that manufactures and markets household cleaning products, home storage solutions, pest control products, and air care products.
Founded in 1886, SC Johnson is headquartered in Racine, Wisconsin, with operations in over 70 countries.
Core Industries: Consumer Goods, Household Products, Cleaning Products
Key Achievements: SC Johnson is known for its iconic brands, including Windex, Pledge, Glade, Raid, and Ziploc, which are trusted by consumers around the world.
The company’s commitment to innovation, sustainability, and corporate responsibility has earned it recognition as a leader in the household and commercial cleaning products industry.
29. TreeHouse Foods Inc.
Background: TreeHouse Foods, Inc. is a multinational food processing company that manufactures and distributes private label and store brand packaged foods and beverages.
Founded in 2005, TreeHouse Foods is headquartered in Oak Brook, Illinois, and operates through multiple business segments, including beverages, meal solutions, snacks, and baked goods.
Core Industries: Food Processing, Private Label Manufacturing, Consumer Packaged Goods
Key Achievements: TreeHouse Foods is a trusted partner to retailers and foodservice operators, offering a wide range of high-quality, value-priced products tailored to their specific needs.
The company’s focus on innovation, efficiency, and customer collaboration has enabled it to build strong relationships and drive growth in the competitive private label food industry.
30. US Foods Holding Corp.
Background: US Foods Holding Corp. is a leading foodservice distributor that supplies a wide range of food and non-food products to restaurants, healthcare facilities, hospitality establishments, and other foodservice operators.
Founded in 1989, US Foods is headquartered in Rosemont, Illinois, and operates a vast distribution network across the United States.
Core Industries: Food Distribution, Foodservice, Logistics
Key Achievements: US Foods is a trusted partner to foodservice operators, offering a comprehensive portfolio of products, services, and solutions to help them succeed in a competitive market.
The company’s commitment to quality, reliability, and customer service has earned it the loyalty of thousands of customers nationwide.
31. TransUnion
Background: TransUnion is a global information and insights company that provides credit reporting, risk management, and analytics solutions to businesses and consumers worldwide.
Founded in 1968, TransUnion is headquartered in Chicago, Illinois, and operates in over 30 countries, serving a wide range of industries, including financial services, healthcare, insurance, and retail.
Core Industries: Information Services, Credit Reporting, Risk Management
Key Achievements: TransUnion is a trusted provider of data and analytics solutions that help businesses make informed decisions and consumers manage their financial health.
The company’s innovative products, advanced technology, and commitment to data security and privacy have earned it recognition as a leader in the information services industry.
32. Navistar International Corporation
Background: Navistar International Corporation is a multinational manufacturer of commercial trucks, buses, defense vehicles, and engines.
Founded in 1902 as International Harvester Company, Navistar is headquartered in Lisle, Illinois, and operates through multiple business segments, including Truck, Parts, Global Operations, and Financial Services.
Core Industries: Automotive, Manufacturing, Engineering
Key Achievements: Navistar is a leading provider of transportation solutions for commercial and government customers, offering a diverse portfolio of vehicles and engines tailored to their specific needs.
The company’s commitment to quality, innovation, and customer satisfaction has earned it a reputation for excellence in the global automotive industry.
33. Ulta Beauty, Inc.
Background: Ulta Beauty, Inc. is a leading beauty retailer that offers a wide range of cosmetic, skincare, haircare, and fragrance products, as well as salon services.
Founded in 1990, Ulta Beauty is headquartered in Bolingbrook, Illinois, and operates over 1,200 stores across the United States.
Core Industries: Retail, Beauty, Cosmetics, Salon Services
Key Achievements: Ulta Beauty is known for its extensive selection of beauty products, personalized shopping experiences, and commitment to inclusivity and diversity.
The company’s innovative store formats, digital platforms, and loyalty program have helped it build a loyal customer base and drive growth in the competitive beauty retail industry.
34. Arthur J. Gallagher & Co.
Background: Arthur J. Gallagher & Co. is a global insurance brokerage and risk management services firm headquartered in Rolling Meadows, Illinois.
Founded in 1927, Gallagher operates through a network of subsidiaries and affiliates, providing insurance, reinsurance, consulting, and brokerage services to clients in over 150 countries.
Core Industries: Insurance, Risk Management, Consulting, Brokerage
Key Achievements: Gallagher is a trusted advisor to businesses, organizations, and individuals, offering customized insurance and risk management solutions to help them protect their assets and achieve their goals.
The company’s global reach, industry expertise, and client-centric approach have made it a leader in the insurance brokerage industry.
35. Groupon, Inc.
Background: Groupon, Inc. is an e-commerce marketplace that connects consumers with local merchants offering deals on goods and services.
Founded in 2008, Groupon is headquartered in Chicago, Illinois, and operates in multiple countries, providing discounts on dining, travel, spa treatments, and other experiences.
Core Industries: E-commerce, Marketplace, Local Deals
Key Achievements: Groupon revolutionized the way consumers shop and discover local businesses, providing a platform for merchants to attract new customers and for consumers to save money on their favorite activities.
The company’s focus on personalized experiences, mobile technology, and merchant partnerships has helped it become a leading player in the online deals industry.
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Conclusion
In conclusion, Illinois boasts a diverse and thriving corporate landscape, evidenced by the presence of these 35 largest companies spanning various industries.
From established giants to innovative newcomers, these companies not only contribute significantly to the state’s economy but also play a pivotal role in shaping its business ecosystem.
Their presence underscores Illinois’ position as a hub of commerce and innovation, showcasing the state’s potential for continued growth and prosperity.
As these companies continue to evolve and expand, they will undoubtedly remain integral to Illinois’ economic vitality, driving progress and opportunity for years to come.
