Companies in Illinois
1.8M companies registered in Illinois, sourced from official business registers and enriched with industry, size, location and contact data. Below: the largest companies by reported revenue, and how the Illinois business base breaks down by industry and headcount.
Part of the United States company directory.
Rankings
Largest companies in Illinois
By reported (actual) revenue, updated September 2026. Public-sector entities are excluded.
| # | Company | Industry | City | Revenue (USD) | Employees |
|---|---|---|---|---|---|
| 1 | Walgreens Holding Company | Dispensing chemist in specialised stores | Deerfield | $147.7B | 312,000 |
| 2 | Archer-Daniels-Midland Company | Manufacture of oils and fats | Chicago | $80.3B | 41,496 |
| 3 | The Allstate Corporation | Life insurance | Northbrook | $67.7B | 53,300 |
| 4 | Abbvie Inc. | Manufacture of pharmaceutical preparations | North Chicago | $61.2B | 57,000 |
| 5 | United Airlines, Inc. | Passenger air transport | Chicago | $59.1B | 113,200 |
| 6 | United Airlines Holdings, Inc. | Passenger air transport | Chicago | $59.1B | 113,200 |
| 7 | Deere & Company | Manufacture of agricultural and forestry machinery | Moline | $45.7B | 73,100 |
| 8 | US Foods Holding Corp. | Wholesale of meat and meat products | Rosemont | $39.4B | 30,000 |
| 9 | Commonspirit Health | Hospital activities | Chicago | $39.1B | 72,500 |
| 10 | Mondelez International, Inc. | Operation of dairies and cheese making | Chicago | $38.5B | 91,000 |
| 11 | Medline Inc. | Manufacture of medical and dental instruments and supplies | Northfield | $28.4B | 45,000 |
| 12 | McDonald's Corporation | Restaurants and mobile food service activities | Chicago | $26.9B | 150,000 |
| 13 | Jones Lang Lasalle Incorporated | Real estate agencies | Chicago | $26.1B | 113,200 |
| 14 | Exelon Corporation | Electric power generation, transmission and distribution | Chicago | $24.3B | 20,571 |
| 15 | Cdw Corporation | Wholesale of computers, computer peripheral equipment and software | Vernon Hills | $22.4B | 14,800 |
| 16 | GE Healthcare Technologies Inc. | Manufacture of irradiation, electromedical and electrotherapeutic equipment | Chicago | $20.6B | 54,000 |
| 17 | W.W. Grainger, Inc. | Non-specialised wholesale trade | Lake Forest | $17.9B | 25,000 |
| 18 | Illinois Tool Works Inc. | Manufacture of plastics and rubber machinery | Glenview | $16B | 43,000 |
| 19 | Bmo Bank National Association | Other monetary intermediation | Chicago | $15.1B | 17,423 |
| 20 | CNA Financial Corporation | Non-life insurance | Chicago | $15B | 6,600 |
| 21 | Northern Trust Corporation | Other monetary intermediation | Chicago | $14.3B | 23,800 |
| 22 | Arthur J. Gallagher & Co. | Activities auxiliary to insurance and pension funding | Rolling Meadows | $13.9B | 72,006 |
| 23 | Kellanova | Manufacture of grain mill products | Chicago | $12.7B | 24,000 |
| 24 | Ulta Beauty, Inc. | Retail sale of flowers, plants, seeds, fertilisers, pet animals and pet food in specialised stores | Bolingbrook | $12.4B | 65,000 |
| 25 | Motorola Solutions, Inc. | Manufacture of consumer electronics | Chicago | $11.7B | 23,000 |
Top 25 by revenue reported to the register. Companies filing no revenue figure are not ranked, whatever their size.
Walgreens Holding Company leads Illinois at $147.7B in reported revenue, from Deerfield.
Coverage
Companies by industry in Illinois
The industries holding the most companies, by NACE activity code.
Ranked by number of companies. Each record carries its NACE code alongside SIC and NAICS, so the same segment can be pulled in any of the three schemes.
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Other business support service activities n.e.c. is the largest activity in Illinois, with 89,530 companies.
Distribution
Company size
By number of employees.
18,624 companies have no disclosed headcount (excluded from the chart).
87% of Illinois companies with a disclosed headcount fall in the 1-4 employee band.
Data coverage
What a Illinois record carries
Share of the state's companies holding each contact field.
29%
with a website
47%
with a phone number
19%
with an email address
Counted against the 1.8M companies in Illinois. Firmographics — industry, size, address, status — are present on every record.
FAQ
Companies in Illinois — frequently asked questions
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