| # | Company | Employees |
|---|---|---|
| 1 |
Allstateallstate.com
This company advocates for peace of mind, builds diverse teams, develops careers, and empowers people and communities through innovation and advocacy |
55,012 |
| 2 |
UL Solutionsul.com
Global provider of safety testing, certification, inspection, auditing, and advisory services ensuring product security, sustainability, and market trust. |
14,487 |
| 3 |
Crate & Barrelcrateandbarrel.com
Leading home furnishings specialty retailer, offering curated products and custom delivery, with physical stores and online platforms across multiple brands globally. |
6,531 |
| 4 |
Mu Sigma Inc.mu-sigma.com
A leading Big Data analytics company partnering with Fortune 500 firms to enhance decision-making, recognized for innovation and transformative solutions |
3,563 |
| 5 |
IDEX Corporationidexcorp.com
The company manufactures mission-critical components used in everyday activities such as automotive safety, emergency rescue tools, and medical equipment |
3,315 |
| 6 |
CF Industriescfindustries.com
Manufacturing and distributing clean energy products with efficient, cost-advantaged facilities and extensive storage and transportation networks across North America and the UK. |
2,736 |
| 7 |
Stepan Companystepan.com
A global manufacturer of specialty chemical products, Stepan collaborates with customers to provide innovative, high-quality solutions for various markets worldwide |
2,210 |
| 8 |
KapStone Paper and Packaging Corporationwestrock.com
Provides innovative paper and packaging products worldwide, partnering with brands to deliver quality, service, and sustainable growth solutions. |
1,116 |
| 9 |
Lou Malnati's Pizzerialoumalnatis.com
A family-owned pizza business with deep roots in Chicago, known for their delicious deep dish pizzas made with quality ingredients and a secret recipe crust |
1,111 |
| 10 |
Wiss, Janney, Elstner Associates, Inc.wje.com
Global firm of engineers, architects, and materials scientists providing innovative solutions for problem-solving, repairs, and prevention in the built world |
909 |
| 11 |
Teletrac Navmanteletracnavman.com
Global industrial technology company offering connected mobility solutions for vehicle and equipment asset management, leveraging AI for operational insights and sustainability |
858 |
| 12 |
KemperSportskempersports.com
The company is a leading provider of management services for golf courses, private clubs, sports venues, and destination resorts nationwide |
689 |
| 13 |
F.E. Moran Group of Companiesfemoran.com
The company provides a range of mechanical and construction services for various markets, offering solutions for Building Automation, Engineering, Fire Protection, HVAC, Plumbing, and more |
662 |
| 14 |
Hilco Globalhilcoglobal.com
Global independent financial services firm providing valuation, monetization, advisory, and capital solutions for tangible and intangible assets, specializing in maximizing value for companies |
626 |
| 15 |
Bell Flavors & Fragrancesbellff.com
A global company specializing in developing flavors and fragrances for various industries worldwide, with operations in 10 countries and distribution in over 100 countries |
605 |
| 16 |
PROMAN Staffing USApromanstaffing.com
National workforce solutions provider specializing in staffing for 3PL, distribution, and manufacturing industries Emphasizes industry expertise, worker safety, and job training |
586 |
| 17 |
Enduranceendurancewarranty.com
A leading provider of comprehensive auto protection plans, offering coverage for a wide range of vehicles and budgets with a focus on service and transparency |
541 |
| 18 |
Pinstripespinstripes.com
Unique experiential dining venue featuring Italian-American cuisine paired with bowling and bocce courts alongside extensive private banquet spaces for diverse group events. |
511 |
| 19 |
Encompass Insuranceencompassinsurance.com
A national insurance company offering high quality personal insurance combining all policies into one secure option Part of the Allstate family, exclusively available through independent agents |
472 |
| 20 |
Old World Industriesowi.com
A 40-year-old company specializing in automotive and heavy duty products for extreme conditions, with a global presence and strong relationships |
407 |
| 21 |
USA Vein Clinics, Vascular, Fibroid and Oncology Centersusaveinclinics.com
State-of-the-art facilities offering comprehensive vein and vascular care by highly trained specialists, using tailored treatment approaches for various conditions |
353 |
| 22 |
FIRST Insurance Fundingfirstinsurancefunding.com
A Northbrook-based insurance financing company, FIRST Insurance Funding works with brokers and agencies nationwide to provide commercial property and casualty loan services |
350 |
| 23 |
Josselynjosselyn.org
Community mental health center providing therapy, psychiatry, case management, art therapy, employment support, and youth intensive programs with a sliding fee scale for accessibility |
295 |
| 24 | 178 | |
| 25 |
Astellas Pharma USastellas.com
Astellas Pharma US, Inc is a pharmaceutical company in Illinois dedicated to improving global health through innovative and reliable products |
177 |
| 26 |
Dreams Retaildreamscorp.com
A vertically integrated sports memorabilia and licensed products business with strong brands, acquired by Fanatics in 2012 Leaders in industry |
177 |
| 27 |
RoboThinkmyrobothink.com
A global STEM education franchise providing 21st century products and curriculum to prepare students for a future powered by AI and robots |
160 |
| 28 |
WellCare Home Healthwellcarehomehealth.net
A home health care company founded by nurses, focused on providing quality care tailored to patients' unique needs in their own homes |
156 |
| 29 |
Ecentriaecentria.com
A company based in Northbrook, Illinois, specializing in providing services or products, likely related to e-commerce based on the name |
147 |
| 30 |
OpticsPlanet, Inc.opticsplanet.com
Specializing in technical gear, OpticsPlanet offers a vast selection of high-performance products from top brands, exceptional customer service, and knowledgeable team members |
131 |
| 31 |
Hilco Valuation Services, LLChilcovaluationservices.com
A company providing asset valuation services to lenders, banks, private equity firms, and corporations for a variety of assets across different industries |
113 |
| 32 |
Corporate Imaging Concepts (CIC)home.corp-imaging.com
A company specializing in branded promotional products, technology-driven order fulfillment, and exceptional customer service to help organizations build stronger brands |
84 |
| 33 |
One Step Aheadwards.com
An online and catalog retailer specializing in problem-solving products for babies, children, and parents, with a focus on research, testing, and customer feedback |
82 |
| 34 |
Total Insurance Servicestotins.com
Total Insurance Services offers tailored risk management and insurance solutions to businesses and individuals, leveraging strong partnerships for competitive pricing and innovative coverage options |
65 |
| 35 |
Indak Manufacturing Corporationindak.com
An American company with manufacturing locations in Illinois, Wisconsin, and Georgia, specializing in electronic and electro-mechanical design, assembly, and production for various industries |
40 |
| 36 |
Northbrook Bank & Trustnorthbrookbank.com
Financial holding company offering community and commercial banking, wealth management, insurance premium financing, mortgage origination, and other services in the Midwest and Florida |
27 |
| 37 |
Levun, Goodman & Cohen, LLPlgclaw.com
Sophisticated law firm offering business law, tax consulting, estate planning, real estate services to businesses, law firms, family offices, private equity firms, and individuals |
27 |
| 38 |
RAMCEL Precision Stamping and Manufacturing LLCramcel.com
A provider of custom stamping solutions with expertise in problem-solving, tooling design, and value-added operations for various industries since 1951 |
26 |
| 39 |
IRON Financialironfinancial.com
An independent investment management firm offering innovative portfolios across core and alternative asset classes with a focus on high-quality, low-cost investments |
26 |
| 40 |
Sheridan Road Financial, a division of HUB Internationalsheridanroad.com
Provider of financial services including investment consulting, executive benefits, wealth management, and financial planning to help Americans retire and pursue their post-retirement goals |
13 |
| 41 |
Hilco Corporate Finance, LLChilcocf.com
A financial services company specializing in valuation, monetization, and advisory solutions to businesses |
13 |
| 42 |
MM Ltd.michaelmenn.com
A premier source for architectural design and construction services, offering excellence in renovation, remodeling, additions, and new construction projects for both residential and commercial clients |
6 |
| 43 |
Warehouse Systems Incwarehousesys.com
This company specializes in integrating distribution fulfillment systems to improve operational efficiency and productivity with various technologies and software solutions |
6 |
| 44 |
North Light Specialty Insurance Companynorthlightspecialty.com
Specializes in providing niche insurance products and services to meet the unique needs of clients in the insurance industry |
5 |
| 45 |
Len Roofing & Remodelinglenroofing.com
A family-owned company offering residential remodeling and improvement services in the Chicagoland area with full installation and servicing capabilities for both commercial and residential projects |
4 |
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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 Oct 24, 2026.
The same list elsewhere in United States
- The largest companies in the United States 91,669
- The largest companies in California 12,813
- The largest companies in New York State 10,485
- The largest companies in Texas 8,086
- The largest companies in Florida 4,945
- The largest companies in Illinois 4,175
- The largest companies in Pennsylvania 3,110
- The largest companies in Massachusetts 3,093
- The largest companies in Georgia 2,632
- The largest companies in Ohio 2,618
- The largest companies in New Jersey 2,569
- The largest companies in Virginia 2,503
- The largest companies in Michigan 2,346
- The largest companies in North Carolina 2,174
- The largest companies in Alabama 1,806
- The largest companies in Washington State 1,785
- The largest companies in Colorado 1,774
- The largest companies in Minnesota 1,700
- The largest companies in Maryland 1,527
- The largest companies in Wisconsin 1,482
- The largest companies in New York 6,920
- The largest companies in San Francisco 2,030
- The largest companies in Houston 1,791
- The largest companies in Chicago 1,668