# List of corporate groups and holding companies in Illinois

Tamtam tracks 154 corporate groups and holding companies headquartered in Illinois. This list ranks the 50 largest by number of employees on LinkedIn, led by Walgreens Boots Alliance, RRD and UL Solutions. Their median headcount is 2,603. Half of them were founded in 1978 or later. The most common headquarters are Chicago (29), Deerfield (2) and Peoria (2).

These are the largest corporate groups and holding companies in Illinois. They are mostly mid-sized to large firms operating in a diverse range of sectors. The list features major players in healthcare, such as OSF HealthCare, an integrated health system, and Walgreens Boots Alliance, an integrated healthcare and retail company. Other prominent companies include Molson Coors Beverage Company, a global producer of beverages, and RRD, a global provider of marketing and supply chain solutions.

A notable pattern among these companies is their headquarters distribution. While many are based in Chicago, a significant number of large firms are headquartered outside the city, in places like Deerfield, Northbrook, Peoria, and Springfield. This indicates a broader distribution of major corporate entities across Illinois beyond its primary urban center.

🇺🇸 Illinois · 50 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Walgreens Boots Alliance](https://www.tamtam.ai/c/walgreens-boots-alliance) (walgreens.com)<br>Integrated healthcare and retail company operating thousands of pharmacy locations, providing medicines, health services, beauty products, and digital convenience globally. | Retail Pharmacies | 🇺🇸 Deerfield | 141,576 | 2014 |
| 2 | [RRD](https://www.tamtam.ai/c/rrd) (rrd.com)<br>Global provider of marketing, packaging, print, and supply chain solutions, focusing on elevating customer engagement with creative execution and environmental impact reduction | Marketing Services | 🇺🇸 Chicago | 41,201 |  |
| 3 | [UL Solutions](https://www.tamtam.ai/c/ul-solutions) (ul.com)<br>Global provider of safety testing, certification, inspection, auditing, and advisory services ensuring product security, sustainability, and market trust. | Professional Services | 🇺🇸 Northbrook | 14,487 | 1894 |
| 4 | [OSF HealthCare](https://www.tamtam.ai/c/osf-healthcare) (osfhealthcare.org)<br>Integrated health system with hospitals, home care, nursing colleges, digital health services, philanthropic foundation, and healthcare innovation investments. | Hospitals and Health Care | 🇺🇸 Peoria | 12,433 |  |
| 5 | [Molson Coors Beverage Company](https://www.tamtam.ai/c/molson-coors-beverage-company) (molsoncoors.com)<br>Global producer of beer, energy drinks, and canned cocktails including brands like Miller Lite and Blue Moon while promoting responsible alcohol consumption. | Food and Beverage Services | 🇺🇸 Chicago | 12,299 | 1786 |
| 6 | [Hospital Sisters Health System](https://www.tamtam.ai/c/hospital-sisters-health-system) (hshs.org)<br>Multi-institutional health system providing integrated, patient-centered care through hospitals, clinics, and physician partners in Illinois and Wisconsin. | Hospitals and Health Care | 🇺🇸 Springfield | 11,854 | 1978 |
| 7 | [Baker Tilly US](https://www.tamtam.ai/c/baker-tilly-us) (bakertilly.com)<br>A leading advisory CPA firm with a coast-to-coast and global presence, part of Baker Tilly International network with 43,000 professionals | Accounting | 🇺🇸 Chicago | 10,594 |  |
| 8 | [LKQ Corporation](https://www.tamtam.ai/c/lkq-corporation) (lkqcorp.com)<br>Largest provider of alternative collision, recycled, and remanufactured auto parts, plus specialty aftermarket equipment and accessories across multiple countries. | Motor Vehicle Manufacturing | 🇺🇸 Chicago | 8,450 | 1998 |
| 9 | [Conagra Brands](https://www.tamtam.ai/c/conagra-brands) (conagrabrands.com)<br>Diverse team managing iconic and emerging food brands with a focus on innovation, integrity, and consistent business results. | Food and Beverage Services | 🇺🇸 Chicago | 7,846 | 1919 |
| 10 | [Carle Health](https://www.tamtam.ai/c/carle-health) (carle.org)<br>Integrated healthcare system combining clinical care, insurance, research, education, and philanthropy to improve patient outcomes and community health. | Hospitals and Health Care | 🇺🇸 Urbana | 6,896 | 1946 |
| 11 | [Adtalem Global Education](https://www.tamtam.ai/c/adtalem-global-education) (covista.com)<br>A leading medical and healthcare education provider, focusing on workforce talent needs through education, certifications, upskilling programs with a diverse, inclusive approach | Education Administration Programs | 🇺🇸 Chicago | 5,688 |  |
| 12 | [Ryan Specialty](https://www.tamtam.ai/c/ryan-specialty) (ryanspecialty.com)<br>International specialty insurance firm providing underwriting, product development, administration, risk management, and wholesale brokerage services for brokers and carriers. | Insurance | 🇺🇸 Chicago | 4,562 | 2010 |
| 13 | [The Heico Companies LLC](https://www.tamtam.ai/c/the-heico-companies-llc) (heicocompanies.com)<br>A privately held company with 74 separate acquisitions in manufacturing, construction, and industrial services, focused on growth and success | Venture Capital and Private Equity Principals | 🇺🇸 Chicago | 4,427 | 1979 |
| 14 | [Allscripts](https://www.tamtam.ai/c/allscripts) (veradigm.com)<br>Healthcare technology company with a focus on transforming healthcare through innovative solutions Follow us at our new LinkedIn page | Software Development | 🇺🇸 Chicago | 4,337 | 1986 |
| 15 | [@properties](https://www.tamtam.ai/c/properties) (atproperties.com)<br>A top real estate brokerage firm in Illinois, offering expert advice, innovative technology, and award-winning services to local homebuyers and sellers | Real Estate | 🇺🇸 Chicago | 3,970 | 2000 |
| 16 | [Baird & Warner](https://www.tamtam.ai/c/baird-and-warner) (bairdwarner.com)<br>Illinois' largest family-owned real estate services company, known for experience, innovation, and integrity, with nearly 2,500 associates and top rankings nationally | Real Estate | 🇺🇸 Schaumburg | 3,957 | 1855 |
| 17 | [Sirva](https://www.tamtam.ai/c/sirva) (sirva.com)<br>A global leader in relocation services, offering mobility solutions to companies worldwide with a diverse portfolio of brands and innovative technology | Real Estate | 🇺🇸 Oakbrook Terrace | 3,652 |  |
| 18 | [Chartis](https://www.tamtam.ai/c/chartis) (chartis.com)<br>Consulting firm specializing in healthcare strategy, transformation, and operational models to improve affordability, accessibility, safety, and patient experience. | Business Consulting and Services | 🇺🇸 Chicago | 3,598 | 2001 |
| 19 | [Cushman & Wakefield - Formerly DTZ](https://www.tamtam.ai/c/cushman-and-wakefield-formerly-dtz) (cushmanwakefield.com)<br>A global leader in commercial real estate services, providing insights and value for occupiers and investors worldwide through various core services | Commercial Real Estate | 🇺🇸 Chicago | 3,518 |  |
| 20 | [LSC Communications](https://www.tamtam.ai/c/lsc-communications) (lsccom.com)<br>Provider of print and digital media solutions, serving publishers, brands, retailers with advanced technology and efficient supply chain services. | Printing Services | 🇺🇸 Chicago | 3,507 | 2016 |
| 21 | [MillerCoors](https://www.tamtam.ai/c/millercoors) (molsoncoors.com)<br>This company produces beverages and was formerly known as MillerCoors | Food and Beverage Services | 🇺🇸 Chicago | 3,386 |  |
| 22 | [Applied Systems](https://www.tamtam.ai/c/applied-systems) (www1.appliedsystems.com)<br>A leading provider of innovative cloud software for the insurance industry, driving transformation through digitization, automation, and new partnerships | Software Development | 🇺🇸 Chicago | 2,813 | 1983 |
| 23 | [Reyes Beverage Group](https://www.tamtam.ai/c/reyes-beverage-group) (reyesbeveragegroup.com)<br>National family-owned distributor delivering beer, spirits, wine, and non-alcoholic beverages to retail accounts while prioritizing employee safety, integrity, and customer profitability across the nation. | Food and Beverage Services | 🇺🇸 Chicago | 2,794 | 1976 |
| 24 | [Clayco](https://www.tamtam.ai/c/clayco) (claycorp.com)<br>A full-service real estate development, architecture, engineering, and construction firm delivering high-quality solutions within North America on time and on budget | Construction | 🇺🇸 Chicago | 2,744 | 1984 |
| 25 | [Fortune Brands Innovations](https://www.tamtam.ai/c/fortune-brands-innovations) (fbin.com)<br>Designs and manufactures water innovations, outdoor living products, security solutions, and kitchen and bath cabinets for homeowners. | Manufacturing | 🇺🇸 Deerfield | 2,603 |  |
| 26 | [Ritchie Bros.](https://www.tamtam.ai/c/ritchie-bros) (rbauction.com)<br>A global asset management and disposition company offering end-to-end solutions for buying and selling used heavy equipment, trucks, and other assets across multiple sectors | Machinery Manufacturing | 🇺🇸 Westchester | 2,573 | 1958 |
| 27 | [Cars Commerce](https://www.tamtam.ai/c/cars-commerce) (carscommerce.inc)<br>Online platform connecting car buyers and sellers through innovative tools and services, supporting automotive retail and career growth nationwide. | Software Development | 🇺🇸 Chicago | 2,285 | 1998 |
| 28 | [IMEG](https://www.tamtam.ai/c/imeg) (imegcorp.com)<br>IMEG is a national engineering and design consulting company focusing on people-centered engineering, high-performing building systems, infrastructure, and construction services | Design Services | 🇺🇸 Rock Island | 2,268 | 1955 |
| 29 | [Ryerson](https://www.tamtam.ai/c/ryerson) (ryerson.com)<br>A global metal processing and distribution company with operations in the US, Mexico, Canada, and China, employing approximately 4,200 people | Manufacturing | 🇺🇸 Chicago | 2,267 | 1842 |
| 30 | [Career Education Corporation](https://www.tamtam.ai/c/career-education-corporation) (perdoceoed.com)<br>Educational services company offering diverse learning formats (online, campus-based, blended) through AIU and CTU with innovative technology and personalized courses | Education Administration Programs | 🇺🇸 Schaumburg | 2,250 | 1994 |
| 31 | [Addison Group](https://www.tamtam.ai/c/addison-group) (addisongroup.com)<br>Professional services firm specializing in talent solutions, consulting, recruiting, and executive search across various sectors, recognized for industry excellence and growth | Staffing and Recruiting | 🇺🇸 Chicago | 2,130 | 1999 |
| 32 | [Tecta America Commercial Roofing](https://www.tamtam.ai/c/tecta-america-commercial-roofing) (tectaamerica.com)<br>A leading commercial roofing contractor with over 90 locations, providing nationwide roofing solutions including installation, maintenance, disaster response, and asset management | Construction | 🇺🇸 Rosemont | 1,999 | 2000 |
| 33 | [Duravant](https://www.tamtam.ai/c/duravant) (duravant.com)<br>A global leader in automation equipment, Duravant offers premium products and solutions to optimize safety, productivity, and efficiency for producers worldwide | Machinery Manufacturing | 🇺🇸 Downers Grove | 1,974 | 2014 |
| 34 | [Northwest Community Healthcare](https://www.tamtam.ai/c/northwest-community-healthcare) (endeavorhealth.org)<br>Endeavor Health is a united healthcare system providing personalized patient experiences and world-class care through convenient access and collaboration #OurEndeavor | Hospitals and Health Care | 🇺🇸 Arlington Heights | 1,916 |  |
| 35 | [Busey](https://www.tamtam.ai/c/busey) (busey.com)<br>A financial holding company offering banking, wealth management, and financial technology services with a focus on community development and employee satisfaction | Banking | 🇺🇸 Champaign | 1,866 | 1868 |
| 36 | [Blessing Health](https://www.tamtam.ai/c/blessing-health) (blessinghealth.org)<br>An integrated health system with hospitals, provider groups, specialty businesses, nursing college, and charitable foundation providing high-quality care to communities | Hospitals and Health Care | 🇺🇸 Quincy | 1,758 | 1875 |
| 37 | [Valassis Marketing Solutions](https://www.tamtam.ai/c/valassis-marketing-solutions) (rrd.com)<br>Innovative marketing solutions company powering business-to-human connections, driving economic growth, and accelerating revenue potential for brands through data intelligence and technology | Advertising Services | 🇺🇸 Chicago | 1,743 |  |
| 38 | [Syndigo](https://www.tamtam.ai/c/syndigo) (syndigo.com)<br>Cloud-based product information management, master data management, and content distribution network serving global enterprises across grocery, healthcare, automotive, and retail sectors for commerce. | Software Development | 🇺🇸 Chicago | 1,726 | 1973 |
| 39 | [The Aspen Group](https://www.tamtam.ai/c/the-aspen-group) (teamtag.com)<br>Supports providers across dental, medical aesthetics, urgent care, and veterinary medicine, empowering clinicians and expanding access to high-quality care nationwide through various brands and education. | Hospitals and Health Care | 🇺🇸 Chicago | 1,697 |  |
| 40 | [VillageMD](https://www.tamtam.ai/c/villagemd) (villagemd.com)<br>The company provides accessible healthcare services through primary, multi-specialty, and urgent care providers in various settings to improve patient outcomes and reduce healthcare costs | Hospitals and Health Care | 🇺🇸 Chicago | 1,683 | 2013 |
| 41 | [Enova International](https://www.tamtam.ai/c/enova-international) (enova.com)<br>A financial services company offering online lending to small businesses and underserved consumers, providing over $52 billion in loans | Financial Services | 🇺🇸 Chicago | 1,570 | 2004 |
| 42 | [Riverside Healthcare](https://www.tamtam.ai/c/riverside-healthcare) (riversidehealthcare.org)<br>Integrated healthcare system providing inpatient and outpatient care, senior living communities, fundraising, fitness center, counseling programs, pharmacy services, and career opportunities in various healthcare fields | Hospitals and Health Care | 🇺🇸 Kankakee | 1,538 | 1964 |
| 43 | [Coeur Mining, Inc.](https://www.tamtam.ai/c/coeur-mining-inc) (coeur.com)<br>Precious metals producer with mines in North America, focusing on responsible mining while prioritizing employee safety, environmental protection, and community engagement through teamwork and innovation | Mining | 🇺🇸 Chicago | 1,465 | 1928 |
| 44 | [RLI Insurance Company](https://www.tamtam.ai/c/rli-insurance-company) (rlicorp.com)<br>Specialty insurer focusing on niche property, casualty, and surety markets, providing customized insurance products and superior customer service. | Insurance | 🇺🇸 Peoria | 1,430 | 1965 |
| 45 | [Advanced Group](https://www.tamtam.ai/c/advanced-group) (advancedgroup.com)<br>Specializing in talent acquisition, outsourcing, and professional services, we provide strategic resourcing, staffing, consulting, and recruitment process outsourcing to various industries | Staffing and Recruiting | 🇺🇸 Chicago | 1,414 |  |
| 46 | [JBT FoodTech](https://www.tamtam.ai/c/jbt-foodtech) (jbtc.com)<br>Design, manufacture, and service customized industrial equipment for processing meat, seafood, poultry, bakery, dairy, juice, and packaged foods worldwide. | Machinery Manufacturing | 🇺🇸 Chicago | 1,407 |  |
| 47 | [Superior Ambulance Service](https://www.tamtam.ai/c/superior-ambulance-service) (superiorambulance.com)<br>A family-owned EMS provider with over 1600 employees and 200 ambulances, offering services in Illinois, Indiana, and Michigan since 1959 | Hospitals and Health Care | 🇺🇸 Elmhurst | 1,398 | 1959 |
| 48 | [National Express LLC](https://www.tamtam.ai/c/national-express-llc) (summitllc.com)<br>North American transportation company focused on safety, quality, customer service, and positive employee relations across multiple locations. | Truck Transportation | 🇺🇸 Lisle | 1,365 | 1917 |
| 49 | [Flying Food Group](https://www.tamtam.ai/c/flying-food-group) (flyingfood.com)<br>A US based company providing authentic meals, logistics, and digital services to the travel and retail industries, with a focus on diversity and giving back | Food and Beverage Manufacturing | 🇺🇸 Chicago | 1,273 | 1983 |
| 50 | [MacLean-Fogg](https://www.tamtam.ai/c/maclean-fogg) (macleanfogg.com)<br>A global enterprise founded in 1925 that specializes in providing solutions, products, and services with world-class quality to customers worldwide | Industrial Machinery Manufacturing | 🇺🇸 Mundelein | 1,261 | 1925 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 11, 2026.

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Source: https://www.tamtam.ai/l/holding-companies-illinois