# Top 100 multinational companies in Illinois

Tamtam tracks 831 multinational companies headquartered in Illinois. This list ranks the 100 largest by number of employees on LinkedIn, led by McDonald's, Walgreens Boots Alliance and Abbott. Their median headcount is 9,895. Half of them were founded in 1927 or later. The most common headquarters are Chicago (55), Evanston (3) and Northbrook (3).

This list comprises large multinational companies based in Illinois, with a notable concentration in the Chicago metropolitan area. Key sectors represented include healthcare, food and beverage, real estate, and finance. Many of these firms have a long-standing presence, with some founded in the late 19th or early 20th century.

Featured companies include McDonald's, a global fast-food chain; Walgreens Boots Alliance, an integrated healthcare and retail company; Abbott, a global healthcare leader in diagnostics and medical devices; and JLL, a professional services firm specializing in real estate. Other prominent firms are Mondelēz International, a global snack manufacturer, and United Airlines, a major airline.

🇺🇸 Illinois · 100 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [McDonald's](https://www.tamtam.ai/c/mcdonald-s) (corporate.mcdonalds.com)<br>global fast-food restaurant chain operating over 37,000 locations worldwide, serving popular menu items and employing 1.9 million people | Restaurants | 🇺🇸 Chicago | 261,219 |  |
| 2 | [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 |
| 3 | [Abbott](https://www.tamtam.ai/c/abbott-abbott-park) (abbott.com)<br>A global healthcare leader offering life-changing technologies in diagnostics, medical devices, nutrition, and generic medicines, with over 115,000 colleagues serving in 160+ countries | Hospitals and Health Care | 🇺🇸 Abbott Park | 140,778 |  |
| 4 | [JLL](https://www.tamtam.ai/c/jll) (jill.com)<br>A leading professional services firm specializing in real estate and investment management, creating rewarding opportunities and sustainable solutions using advanced technology | Real Estate | 🇺🇸 Chicago | 104,899 |  |
| 5 | [Hyatt](https://www.tamtam.ai/c/hyatt) (hyatt.com)<br>Global management of luxury hotels and all-inclusive resorts across six continents including vacation clubs, loyalty programs, destination management services, and travel technology solutions. | Hospitality | 🇺🇸 Chicago | 84,541 |  |
| 6 | [Mondelēz International](https://www.tamtam.ai/c/mondelez-international) (mondelezinternational.com)<br>Global multinational manufacturing and marketing iconic snacks, biscuits, chocolate, candy, and gum brands including Oreo and Cadbury to empower people to snack right. | Food and Beverage Manufacturing | 🇺🇸 Chicago | 79,000 | 2012 |
| 7 | [United Airlines](https://www.tamtam.ai/c/united-airlines) (united.com)<br>Leading airline with over 90,000 employees focused on customer service, sustainability, and teamwork, currently hiring 15,000 new team members in 2023 | Airlines and Aviation | 🇺🇸 Chicago | 75,520 | 1926 |
| 8 | [AbbVie](https://www.tamtam.ai/c/abbvie) (abbvie.com)<br>Global biopharmaceutical company focused on creating impactful medicines for complex health issues in immunology, oncology, neuroscience, eye care, aesthetics, and other unmet needs | Pharmaceutical Manufacturing | 🇺🇸 North Chicago | 61,015 |  |
| 9 | [GE HealthCare](https://www.tamtam.ai/c/ge-healthcare) (gehealthcare.com)<br>Global medical technology and digital solutions innovator leveraging intelligent devices, data analytics, and artificial intelligence to drive precision health and improve patient outcomes worldwide | Hospitals and Health Care | 🇺🇸 Chicago | 60,041 | 1892 |
| 10 | [John Deere](https://www.tamtam.ai/c/john-deere) (deere.com)<br>A global leader in cutting-edge products and technology for agriculture and construction, pushing boundaries for productivity and sustainability worldwide | Machinery Manufacturing | 🇺🇸 Moline | 55,618 | 1837 |
| 11 | [Allstate](https://www.tamtam.ai/c/allstate) (allstate.com)<br>This company advocates for peace of mind, builds diverse teams, develops careers, and empowers people and communities through innovation and advocacy | Insurance | 🇺🇸 Northbrook | 55,012 | 1931 |
| 12 | [Cushman & Wakefield](https://www.tamtam.ai/c/cushman-and-wakefield) (cushmanwakefield.com)<br>Global commercial real estate services provider with 52,000 professionals focused on advancing client, colleague, and community outcomes worldwide. | Real Estate | 🇺🇸 Chicago | 53,000 | 1917 |
| 13 | [Gallagher](https://www.tamtam.ai/c/gallagher) (gallagher.com)<br>Global insurance brokerage offering risk management, consulting, employee benefits, claims management, and retirement services to protect assets and support clients. | Insurance | 🇺🇸 Rolling Meadows | 52,767 |  |
| 14 | [ADM](https://www.tamtam.ai/c/adm) (adm.com)<br>Global nutrition company transforming industries with plant-based solutions, sustainable practices, and cutting-edge innovations for a healthier, more environmentally friendly future | Food and Beverage Manufacturing | 🇺🇸 Chicago | 42,789 | 1902 |
| 15 | [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 |  |
| 16 | [Baxter International Inc.](https://www.tamtam.ai/c/baxter-international-inc) (baxter.com)<br>Development and delivery of innovative medical technologies and solutions to support clinicians and improve patient health worldwide. | Medical Equipment Manufacturing | 🇺🇸 Deerfield | 39,170 |  |
| 17 | [Kraft Heinz](https://www.tamtam.ai/c/kraft-heinz) (kraftheinz.com)<br>Producer of high-quality food and beverage products including condiments, dairy, meals, beverages, and nutrition items marketed worldwide. | Food and Beverage Services | 🇺🇸 Chicago | 39,000 | 2015 |
| 18 | [Northern Trust](https://www.tamtam.ai/c/northern-trust) (northerntrust.com)<br>Global provider of innovative wealth management, asset servicing, and investment solutions for institutions, families, and individuals through diverse technology and financial expertise. | Financial Services | 🇺🇸 Chicago | 30,965 | 1889 |
| 19 | [NielsenIQ](https://www.tamtam.ai/c/nielseniq) (nielseniq.com)<br>A leading consumer intelligence company offering comprehensive consumer insights, advanced analytics, and global retail data to drive growth opportunities | Information Services | 🇺🇸 Chicago | 29,989 | 1923 |
| 20 | [HGS](https://www.tamtam.ai/c/hgs) (hgs.com)<br>A global leader in customer experience optimization, digital transformation, and business process management, combining automation, analytics, and AI to drive competitiveness | IT Services and IT Consulting | 🇺🇸 Chicago | 29,010 |  |
| 21 | [Motorola Solutions](https://www.tamtam.ai/c/motorola-solutions) (motorolasolutions.com)<br>The company builds and connects technologies to enhance public safety collaboration for safer communities, schools, hospitals, and businesses worldwide | Telecommunications | 🇺🇸 Chicago | 28,153 |  |
| 22 | [Discover Financial Services](https://www.tamtam.ai/c/discover-financial-services) (discover.com)<br>Provider of lending products and payment services enabling merchants, fintech companies, and consumers to access financial solutions and global card acceptance. | Financial Services | 🇺🇸 Riverwoods | 21,937 |  |
| 23 | [Grainger](https://www.tamtam.ai/c/grainger) (bit.ly)<br>Provides over a million industrial-quality products, inventory management, technical support, and consultative sales for diverse industries worldwide. | Retail Office Equipment | 🇺🇸 Lake Forest | 21,907 | 1927 |
| 24 | [ZS](https://www.tamtam.ai/c/zs) (zs.com)<br>Management consulting and technology firm combining data, science, and human ingenuity to deliver impactful solutions and improve business outcomes worldwide. | Business Consulting and Services | 🇺🇸 Evanston | 21,618 | 1983 |
| 25 | [RSM US LLP](https://www.tamtam.ai/c/rsm-us-llp) (rsmus.com)<br>Provider of assurance, tax, and consulting services focused on middle market clients with a global presence and professional development culture. | Accounting | 🇺🇸 Chicago | 19,700 | 1926 |
| 26 | [Ace Hardware Corporation](https://www.tamtam.ai/c/ace-hardware-corporation) (acehardware.com)<br>Largest retailer-owned hardware cooperative, operating over 5,800 locally owned and operated stores globally. Provides distribution and support to independent hardware retailers. | Retail | 🇺🇸 Oak Brook | 19,460 | 1924 |
| 27 | [Medline](https://www.tamtam.ai/c/medline-northfield) (medline.com)<br>Provides medical-surgical products and supply chain solutions to healthcare providers globally, improving their clinical, financial, and operational outcomes. | Medical Equipment Manufacturing | 🇺🇸 Northfield | 18,809 |  |
| 28 | [CDW](https://www.tamtam.ai/c/cdw) (cdw.com)<br>A leading IT solutions provider offering a full-stack approach with extensive services and deep industry expertise to drive innovation and achieve organizational goals | IT Services and IT Consulting | 🇺🇸 Vernon Hills | 18,732 |  |
| 29 | [ITW](https://www.tamtam.ai/c/itw) (careers.itw.com)<br>Global multi-industrial manufacturing leader driving solid growth with innovative solutions, emphasizing decentralized culture | Machinery Manufacturing | 🇺🇸 Glenview | 18,709 | 1912 |
| 30 | [University of Chicago](https://www.tamtam.ai/c/university-of-chicago) (uchicago.edu)<br>A prestigious academic institution encouraging scholars and students to think critically, explore various disciplines, and challenge conventional ideas for global enrichment | Higher Education | 🇺🇸 Chicago | 18,526 |  |
| 31 | [Hyatt Regency](https://www.tamtam.ai/c/hyatt-regency) (regency.hyatt.com)<br>Hyatt Regency hotels offer seamless connections for business and leisure travelers in over 30 countries, ensuring enthusiastic service and attention to detail | Hospitality | 🇺🇸 Chicago | 17,551 |  |
| 32 | [Motorola Mobility (a Lenovo Company)](https://www.tamtam.ai/c/motorola-mobility-a-lenovo-company) (motorola.com)<br>Innovative smartphones and accessories are created by a global team, fostering collaboration, creativity, and a commitment to consumer-centric mobile technology innovation | Computers and Electronics Manufacturing | 🇺🇸 Chicago | 17,456 | 1928 |
| 33 | [TransUnion](https://www.tamtam.ai/c/transunion) (transunion.com)<br>Global information and insights company enabling trust and confident transactions by providing actionable, data-driven pictures of individuals for businesses and consumers worldwide | IT Services and IT Consulting | 🇺🇸 Chicago | 17,036 |  |
| 34 | [Northwestern University](https://www.tamtam.ai/c/northwestern-university) (northwestern.edu)<br>Premier research university offering innovative teaching, pioneering research, and diverse, collaborative environments across multiple campuses near Chicago and Qatar. | Higher Education | 🇺🇸 Evanston | 16,997 | 1851 |
| 35 | [HUB International](https://www.tamtam.ai/c/hub-international) (hubinternational.com)<br>Advises businesses and individuals on insurance, risk management, employee benefits, retirement, and wealth management with tailored solutions. | Insurance | 🇺🇸 Chicago | 16,129 |  |
| 36 | [Molex](https://www.tamtam.ai/c/molex) (molex.com)<br>Global company providing connectivity solutions for various industries, including data communications, medical, automotive, and consumer electronics, to improve lives and transform the future | Appliances, Electrical, and Electronics Manufacturing | 🇺🇸 Lisle | 14,810 | 1938 |
| 37 | [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 |
| 38 | [Nalco Water, An Ecolab Company](https://www.tamtam.ai/c/nalco-water-an-ecolab-company) (ecolab.com)<br>A global leader in water and process management solutions, leveraging connected chemistry and digital innovation to optimize sustainability and business outcomes | Chemical Manufacturing | 🇺🇸 Naperville | 12,751 |  |
| 39 | [Thoughtworks](https://www.tamtam.ai/c/thoughtworks) (thoughtworks.com)<br>A global technology consultancy specializing in strategy, design, and engineering to drive digital innovation, fostering diverse talent and a strong cultivation culture | IT Services and IT Consulting | 🇺🇸 Chicago | 12,735 |  |
| 40 | [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 |
| 41 | [Morningstar](https://www.tamtam.ai/c/morningstar) (morningstar.com)<br>Independent investment insights, data, and research for various global markets including managed products, private capital, debt securities, and comprehensive asset management services. | Financial Services | 🇺🇸 Chicago | 12,028 | 1984 |
| 42 | [Baker McKenzie](https://www.tamtam.ai/c/baker-mckenzie) (bakermckenzie.com)<br>Provide practical legal advice combining local knowledge and international expertise to help businesses succeed across global markets. | Law Practice | 🇺🇸 Chicago | 11,895 |  |
| 43 | [Zebra Technologies](https://www.tamtam.ai/c/zebra-technologies) (zebra.com)<br>Improving workflows through innovative technology solutions, connecting frontline workers and optimizing visibility with scanning, track-and-trace, and automation tools | IT Services and IT Consulting | 🇺🇸 Lincolnshire | 11,698 |  |
| 44 | [BMO U.S.](https://www.tamtam.ai/c/bmo-u-s) (bmo.com)<br>Providing personalized banking solutions through extensive branch network and dedicated team to support customers at every financial life stage. | Banking | 🇺🇸 Chicago | 11,608 |  |
| 45 | [Grant Thornton (US)](https://www.tamtam.ai/c/grant-thornton-us) (grantthornton.com)<br>Provides independent audit, tax, and advisory services through a global network, focusing on quality, trust, and strong client relationships. | Professional Services | 🇺🇸 Chicago | 11,518 | 1924 |
| 46 | [Encore](https://www.tamtam.ai/c/encore-schiller-park) (encoreglobal.com)<br>Global leader in event technology and production services, specializing in creating engaging experiences for hybrid, virtual, and in-person events worldwide Operating in 17+ countries | Events Services | 🇺🇸 Schiller Park | 10,625 |  |
| 47 | [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 |  |
| 48 | [Groupon](https://www.tamtam.ai/c/groupon) (job-boards.eu.greenhouse.io)<br>An experiences marketplace offering local deals, live events, and travel options, helping people discover new experiences while assisting businesses in growing | Software Development | 🇺🇸 Chicago | 10,452 | 2008 |
| 49 | [International](https://www.tamtam.ai/c/international) (international.com)<br>Manufacture durable trucks, engines, and buses with aftermarket parts, focusing on uptime, productivity, and sustainable mobility solutions. | Motor Vehicle Manufacturing | 🇺🇸 Lisle | 10,420 |  |
| 50 | [Claire's](https://www.tamtam.ai/c/claire-s) (claires.com)<br>Retail and wholesale provider of fashion accessories and jewelry, inspiring self-expression and unique style across North America and internationally. | Retail | 🇺🇸 Hoffman Estates | 9,895 |  |
| 51 | [Crowe](https://www.tamtam.ai/c/crowe-chicago) (crowe.com)<br>A global firm providing public accounting, consulting, and technology services, helping clients make smart decisions and uncover hidden opportunities worldwide | Professional Services | 🇺🇸 Chicago | 9,411 |  |
| 52 | [Brunswick Corporation](https://www.tamtam.ai/c/brunswick-corporation) (brunswick.com)<br>Global leader in marine recreation offering propulsion systems, boats, marine technology, parts, accessories, and related services worldwide. | Manufacturing | 🇺🇸 Mettawa | 9,409 |  |
| 53 | [Zurich North America](https://www.tamtam.ai/c/zurich-north-america) (zurichna.com)<br>Provider of insurance solutions and services to businesses and individuals across various industries, including Fortune 500 companies. | Insurance | 🇺🇸 Schaumburg | 9,359 |  |
| 54 | [Komatsu North America](https://www.tamtam.ai/c/komatsu-north-america) (komatsu.com)<br>This company specializes in providing technologies, equipment, and services for construction, mining, forklift, industrial, and forestry markets worldwide to enhance safety and promote productivity | Machinery Manufacturing | 🇺🇸 Chicago | 9,252 |  |
| 55 | [Pampered Chef](https://www.tamtam.ai/c/pampered-chef) (pamperedchef.com)<br>Development and sales of unique, high-quality kitchen tools, cookware, and pantry products through independent consultants and ecommerce. | Retail | 🇺🇸 Addison | 9,039 | 1980 |
| 56 | [Rotary International](https://www.tamtam.ai/c/rotary-international) (rotary.org)<br>Global network of leaders and volunteers uniting to create lasting positive change in communities worldwide through service and engagement. | Non-profit Organizations | 🇺🇸 Evanston | 8,787 |  |
| 57 | [Kirkland & Ellis](https://www.tamtam.ai/c/kirkland-and-ellis) (kirkland.com)<br>Providing top-tier legal services in corporate transactions, litigation, investigations, and asset management with global reach and innovative approach. | Law Practice | 🇺🇸 Chicago | 8,683 | 1909 |
| 58 | [YASH Technologies](https://www.tamtam.ai/c/yash-technologies) (yash.com)<br>Consulting-led digital transformation partner offering technology, advisory, and outsourcing services to optimize client performance and revenue growth globally. | IT Services and IT Consulting | 🇺🇸 East Moline | 8,670 | 1996 |
| 59 | [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 |
| 60 | [Afni, Inc.](https://www.tamtam.ai/c/afni-inc) (afni.com)<br>Global contact center team providing prompt customer service on various devices Offering channel strategies and solutions to build profitable customer relationships | Outsourcing and Offshoring Consulting | 🇺🇸 Bloomington | 8,044 | 1936 |
| 61 | [Aptar](https://www.tamtam.ai/c/aptar) (aptar.com)<br>Global leader in drug and consumer product dosing, dispensing and protection technologies, creating innovative solutions for various end markets and brands. | Packaging and Containers Manufacturing | 🇺🇸 | 7,968 |  |
| 62 | [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 |
| 63 | [Transdev North America](https://www.tamtam.ai/c/transdev-north-america) (transdevna.com)<br>Provides safe, reliable, and innovative transportation services including bus, rail, paratransit, autonomous vehicles, and maintenance across 45 US states. | Urban Transit Services | 🇺🇸 Lombard | 7,841 |  |
| 64 | [Reyes Holdings](https://www.tamtam.ai/c/reyes-holdings) (reyesholdings.com)<br>Global food and beverage products distribution, including beer, spirits, quick-service restaurant supplies, and Coca-Cola brands, serving 200+ locations worldwide. | Food and Beverage Services | 🇺🇸 Rosemont | 7,649 | 1976 |
| 65 | [Kearney](https://www.tamtam.ai/c/kearney) (kearney.com)<br>Global consulting firm with a focus on people, strategic operations, and building the future through teamwork and hands-on expertise in over 40 countries | Business Consulting and Services | 🇺🇸 Chicago | 7,559 | 1926 |
| 66 | [CNA Insurance](https://www.tamtam.ai/c/cna-insurance) (cna.com)<br>Provides commercial property and casualty insurance products and services for businesses and professionals across the U.S., Canada, and Europe. | Insurance | 🇺🇸 Chicago | 7,473 | 1897 |
| 67 | [Loyola University Chicago](https://www.tamtam.ai/c/loyola-university-chicago) (luc.edu)<br>Private Jesuit Catholic university offering diverse undergraduate, graduate, and professional programs across multiple campuses including Chicago and Rome. | Higher Education | 🇺🇸 Chicago | 7,315 | 1870 |
| 68 | [SP+ (SP Plus)](https://www.tamtam.ai/c/sp-sp-plus) (spplus.com)<br>The company specializes in developing technology and operations management solutions for efficient movement of people, vehicles, and personal belongings | Facilities Services | 🇺🇸 Chicago | 7,185 | 1929 |
| 69 | [Convergint](https://www.tamtam.ai/c/convergint) (convergint.com)<br>Global systems integrator delivering results through unparalleled service excellence in electronic security, cybersecurity, fire safety, building automation, and audio-visual systems | Security and Investigations | 🇺🇸 Hoffman Estates | 7,151 |  |
| 70 | [Gallagher Bassett](https://www.tamtam.ai/c/gallagher-bassett) (gallagherbassett.com)<br>Provider of claims and risk management services, offering consulting, technical support, and innovative solutions across global insurance sectors. | Insurance | 🇺🇸 Rolling Meadows | 6,826 | 1962 |
| 71 | [Leo Burnett](https://www.tamtam.ai/c/leo-burnett) (leoburnett.com)<br>Global communications agency combining creativity, data, and technology to influence human behavior and drive client prosperity worldwide. | Advertising Services | 🇺🇸 Chicago | 6,825 |  |
| 72 | [SGK](https://www.tamtam.ai/c/sgk-des-plaines) (sgkinc.com)<br>Global packaging and brand experience company delivering solutions for brands to speak louder, scale faster, and grow stronger, with 6,500 employees worldwide | Advertising Services | 🇺🇸 Des Plaines | 6,821 |  |
| 73 | [Stericycle](https://www.tamtam.ai/c/stericycle) (linktr.ee)<br>A leading compliance company providing essential services for proper disposal of medical waste and confidential information, protecting client relationships and the environment | Hospitals and Health Care | 🇺🇸 Bannockburn | 6,777 |  |
| 74 | [Crate & Barrel](https://www.tamtam.ai/c/crate-and-barrel) (crateandbarrel.com)<br>Leading home furnishings specialty retailer, offering curated products and custom delivery, with physical stores and online platforms across multiple brands globally. | Retail | 🇺🇸 Northbrook | 6,531 | 1962 |
| 75 | [Huron](https://www.tamtam.ai/c/huron) (huronconsultinggroup.com)<br>A global professional services firm specializing in strategy creation, operations optimization, digital transformation, and empowering businesses for sustainable results | Business Consulting and Services | 🇺🇸 Chicago | 6,453 | 2002 |
| 76 | [AAR](https://www.tamtam.ai/c/aar) (aarcorp.com)<br>Global provider of aviation services to commercial and government markets, offering aftermarket expertise, aviation services, MRO, parts supply, integrated solutions, and manufacturing capabilities | Airlines and Aviation | 🇺🇸 Wood Dale | 6,341 | 1955 |
| 77 | [Dover Corporation](https://www.tamtam.ai/c/dover-corporation) (dovercorporation.com)<br>A global manufacturer and solutions provider delivering innovative equipment, components, and digital solutions across various industries with operational agility and entrepreneurial approach | Machinery Manufacturing | 🇺🇸 Downers Grove | 6,338 |  |
| 78 | [Accenture Strategy & Consulting](https://www.tamtam.ai/c/accenture-strategy-and-consulting) (accenture.com)<br>Combines deep industry expertise with advanced analytics and human-led design methodologies to help global clients act with speed and confidence throughout operations. | Business Consulting and Services | 🇺🇸 Chicago | 6,217 |  |
| 79 | [Circana](https://www.tamtam.ai/c/circana) (circana.com)<br>A company advising on consumer behavior complexity using advanced technology and analytics to help brands and retailers unlock business growth | Market Research | 🇺🇸 Chicago | 6,212 | 2023 |
| 80 | [Kellanova](https://www.tamtam.ai/c/kellanova) (kellanova.com)<br>A global powerhouse in snacks, cereal, noodles, and frozen foods, committed to creating better days and promoting sustainable access to food | Food and Beverage Manufacturing | 🇺🇸 Chicago | 6,197 | 2023 |
| 81 | [Flex-N-Gate](https://www.tamtam.ai/c/flex-n-gate) (flex-n-gate.com)<br>A leading provider of high-quality automotive products and systems, specializing in aftermarket and OEM parts with a focus on continuous improvement and on-time delivery | Motor Vehicle Manufacturing | 🇺🇸 Urbana | 6,096 | 1956 |
| 82 | [Great Wolf Lodge](https://www.tamtam.ai/c/great-wolf-lodge) (greatwolf.com)<br>Indoor water park resorts offering family entertainment, dining, retail, and career growth opportunities with exceptional service and fun environment. | Hospitality | 🇺🇸 Chicago | 6,083 | 1997 |
| 83 | [Uber Freight](https://www.tamtam.ai/c/uber-freight) (uberfreight.com)<br>Provides technology-driven freight transportation solutions connecting shippers and carriers to optimize logistics and improve supply chain efficiency. | Transportation, Logistics, Supply Chain and Storage | 🇺🇸 Chicago | 6,012 |  |
| 84 | [USG](https://www.tamtam.ai/c/usg) (usg.com)<br>A leading manufacturer of building products, providing innovative solutions for walls, ceilings, flooring, and roofing in construction markets worldwide | Wholesale Building Materials | 🇺🇸 Chicago | 5,752 | 1902 |
| 85 | [Starcom](https://www.tamtam.ai/c/starcom) (starcomww.com)<br>A global leader in communications planning and media, focused on putting people at the center to inspire and drive business forward through data and technology | Advertising Services | 🇺🇸 Chicago | 5,691 |  |
| 86 | [CES](https://www.tamtam.ai/c/ces-bolingbrook) (cesltd.com)<br>Providing technology and business process modernization services including digital transformation, enterprise applications, managed IT, cloud, renewables, and cybersecurity solutions. | IT Services and IT Consulting | 🇺🇸 Bolingbrook | 5,562 | 1996 |
| 87 | [Continental Airlines](https://www.tamtam.ai/c/continental-airlines) (united.com)<br>A major US airline formed through a merger in 2010, offering a global route network, modern fleet, loyalty program, and airport hubs | Airlines and Aviation | 🇺🇸 Chicago | 5,439 |  |
| 88 | [Ferrara](https://www.tamtam.ai/c/ferrara) (ferrarausa.com)<br>A leading sugar confectionery company in the US, focused on driving category development with a diverse portfolio of iconic brands | Food and Beverage Manufacturing | 🇺🇸 Chicago | 5,430 | 1908 |
| 89 | [Breakthru Beverage Group](https://www.tamtam.ai/c/breakthru-beverage-group) (breakthrubev.com)<br>Family-owned beverage wholesaler distributing premier spirits, wine, beer, and non-alcoholic brands across North American retail and hospitality markets. | Wholesale | 🇺🇸 Cicero | 5,424 | 1922 |
| 90 | [ACCO Brands](https://www.tamtam.ai/c/acco-brands) (accobrands.com)<br>Design, market, and sell branded consumer products that enhance productivity, confidence, and enjoyment in work, learning, and play worldwide. | Manufacturing | 🇺🇸 Lake Zurich | 5,322 | 1903 |
| 91 | [Littelfuse](https://www.tamtam.ai/c/littelfuse) (littelfuse.com)<br>A global industrial technology manufacturing company providing innovative solutions for industrial, transportation, and electronics markets with a commitment to diversity and equal employment opportunities | Appliances, Electrical, and Electronics Manufacturing | 🇺🇸 Rosemont | 5,181 | 1927 |
| 92 | [Combined, a Chubb Benefits Company](https://www.tamtam.ai/c/combined-a-chubb-benefits-company) (combinedinsurance.com)<br>Provider of supplemental accident, health, and life insurance products focused on affordable, clear, and easy-to-understand coverage for families. | Insurance | 🇺🇸 Chicago | 5,177 | 1922 |
| 93 | [Sidley Austin LLP](https://www.tamtam.ai/c/sidley-austin-llp) (sidley.com)<br>Providing comprehensive legal services worldwide, specializing in complex transactions, restructuring, investigations, regulatory, and litigation matters across multiple industries. | Law Practice | 🇺🇸 Chicago | 5,113 | 1866 |
| 94 | [James Hardie](https://www.tamtam.ai/c/james-hardie) (jameshardie.com)<br>Global leader in high-performance fiber cement and fiber gypsum building solutions, empowering homeowners and professionals worldwide with premium quality products for design and protection | Wholesale Building Materials | 🇺🇸 Chicago | 5,022 |  |
| 95 | [Lions Clubs International](https://www.tamtam.ai/c/lions-clubs-international) (lionsclubs.org)<br>Provide vision and health screenings, build parks, support eye hospitals, award scholarships, assist youth, and aid disaster relief worldwide. | Non-profit Organizations | 🇺🇸 Oak Brook | 4,994 | 1917 |
| 96 | [EVERSANA](https://www.tamtam.ai/c/eversana) (eversana.com)<br>Provider of global services to the life sciences industry, focusing on the patient experience and delivering value throughout the product life cycle Serving 650+ organizations | Pharmaceutical Manufacturing | 🇺🇸 Chicago | 4,836 | 2018 |
| 97 | [CME Group](https://www.tamtam.ai/c/cme-group) (cmegroup.com)<br>Global derivatives marketplace offering benchmark products across asset classes through electronic trading platforms and central counterparty clearing services for diverse financial risk management. | Financial Services | 🇺🇸 Chicago | 4,781 |  |
| 98 | [Panduit](https://www.tamtam.ai/c/panduit) (panduit.com)<br>The company provides innovative electrical and network infrastructure solutions, serving as a trusted advisor in Data Center, Enterprise, and Industrial environments | Appliances, Electrical, and Electronics Manufacturing | 🇺🇸 Tinley Park | 4,640 | 1955 |
| 99 | [The Walsh Group - Walsh Construction & Archer Western](https://www.tamtam.ai/c/the-walsh-group-walsh-construction-and-archer-western) (walshgroup.com)<br>Family-owned construction company specializing in design, build, finance, operation across building, civil, transportation sectors with skilled workforce. | Construction | 🇺🇸 Chicago | 4,597 | 1898 |
| 100 | [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 |

## 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.

## More company lists in Illinois

- [The largest companies in Illinois](https://www.tamtam.ai/l/largest-companies-illinois) (4,687)
- [Manufacturers in Illinois](https://www.tamtam.ai/l/manufacturers-illinois) (528)
- [Education providers in Illinois](https://www.tamtam.ai/l/education-companies-illinois) (370)
- [Financial services firms in Illinois](https://www.tamtam.ai/l/financial-services-firms-illinois) (352)
- [Professional services firms in Illinois](https://www.tamtam.ai/l/professional-services-firms-illinois) (339)
- [Companies with in-house R&D in Illinois](https://www.tamtam.ai/l/r-and-d-companies-illinois) (322)
- [Hardware manufacturers in Illinois](https://www.tamtam.ai/l/hardware-companies-illinois) (296)
- [IT Services and IT Consulting companies in Illinois](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-illinois) (294)
- [Hospitals and Health Care companies in Illinois](https://www.tamtam.ai/l/hospitals-and-health-care-companies-illinois) (280)
- [IT services companies in Illinois](https://www.tamtam.ai/l/it-services-companies-illinois) (274)
- [Healthcare providers in Illinois](https://www.tamtam.ai/l/healthcare-providers-illinois) (262)
- [Retail chains in Illinois](https://www.tamtam.ai/l/retail-chains-illinois) (260)
- [Financial Services companies in Illinois](https://www.tamtam.ai/l/financial-services-companies-illinois) (248)
- [Critical infrastructure operators in Illinois](https://www.tamtam.ai/l/critical-infrastructure-operators-illinois) (241)
- [Consulting firms in Illinois](https://www.tamtam.ai/l/consulting-firms-illinois) (238)
- [Logistics companies in Illinois](https://www.tamtam.ai/l/logistics-companies-illinois) (228)
- [Transportation, Logistics, Supply Chain and Storage companies in Illinois](https://www.tamtam.ai/l/transportation-logistics-supply-chain-and-storage-companies-illinois) (215)
- [SaaS companies in Illinois](https://www.tamtam.ai/l/saas-companies-illinois) (182)
- [Companies with a mobile app in Illinois](https://www.tamtam.ai/l/companies-with-mobile-app-illinois) (178)
- [Family-owned companies in Illinois](https://www.tamtam.ai/l/family-owned-companies-illinois) (166)
- [Subscription businesses in Illinois](https://www.tamtam.ai/l/subscription-businesses-illinois) (160)
- [Corporate groups and holding companies in Illinois](https://www.tamtam.ai/l/holding-companies-illinois) (154)
- [Publicly traded companies in Illinois](https://www.tamtam.ai/l/publicly-traded-companies-illinois) (154)
- [Public sector organisations in Illinois](https://www.tamtam.ai/l/public-sector-organisations-illinois) (147)

## The same list elsewhere in United States

- [Multinational companies in the United States](https://www.tamtam.ai/l/multinational-companies-united-states) (16,197)
- [Multinational companies in California](https://www.tamtam.ai/l/multinational-companies-california) (2,592)
- [Multinational companies in New York State](https://www.tamtam.ai/l/multinational-companies-new-york-state) (2,216)
- [Multinational companies in Texas](https://www.tamtam.ai/l/multinational-companies-texas) (1,418)
- [Multinational companies in Florida](https://www.tamtam.ai/l/multinational-companies-florida) (897)
- [Multinational companies in Massachusetts](https://www.tamtam.ai/l/multinational-companies-massachusetts) (637)
- [Multinational companies in New Jersey](https://www.tamtam.ai/l/multinational-companies-new-jersey) (624)
- [Multinational companies in Georgia](https://www.tamtam.ai/l/multinational-companies-georgia) (521)
- [Multinational companies in Pennsylvania](https://www.tamtam.ai/l/multinational-companies-pennsylvania) (472)
- [Multinational companies in Michigan](https://www.tamtam.ai/l/multinational-companies-michigan) (468)
- [Multinational companies in Alabama](https://www.tamtam.ai/l/multinational-companies-alabama) (416)
- [Multinational companies in Virginia](https://www.tamtam.ai/l/multinational-companies-virginia) (396)
- [Multinational companies in Ohio](https://www.tamtam.ai/l/multinational-companies-ohio) (390)
- [Multinational companies in North Carolina](https://www.tamtam.ai/l/multinational-companies-north-carolina) (358)
- [Multinational companies in Washington State](https://www.tamtam.ai/l/multinational-companies-washington-state) (288)
- [Multinational companies in Colorado](https://www.tamtam.ai/l/multinational-companies-colorado) (228)
- [Multinational companies in Minnesota](https://www.tamtam.ai/l/multinational-companies-minnesota) (224)
- [Multinational companies in New York](https://www.tamtam.ai/l/multinational-companies-new-york) (1,836)
- [Multinational companies in San Francisco](https://www.tamtam.ai/l/multinational-companies-san-francisco) (446)
- [Multinational companies in Houston](https://www.tamtam.ai/l/multinational-companies-houston) (402)
- [Multinational companies in Chicago](https://www.tamtam.ai/l/multinational-companies-chicago) (366)
- [Multinational companies in Miami](https://www.tamtam.ai/l/multinational-companies-miami) (289)
- [Multinational companies in Atlanta](https://www.tamtam.ai/l/multinational-companies-atlanta) (252)
- [Multinational companies in Boston](https://www.tamtam.ai/l/multinational-companies-boston) (241)

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