| # | Company | Employees |
|---|---|---|
| 1 |
Gallaghergallagher.com
Global insurance brokerage offering risk management, consulting, employee benefits, claims management, and retirement services to protect assets and support clients. |
52,767 |
| 2 |
Gallagher Bassettgallagherbassett.com
Provider of claims and risk management services, offering consulting, technical support, and innovative solutions across global insurance sectors. |
6,826 |
| 3 |
AssuredPartnersajg.com
Global insurance brokerage specializing in industry-specific solutions for businesses and consumers, offering services in commercial insurance, risk management, and employee benefits |
3,075 |
| 4 | 2,628 | |
| 5 |
Risk Placement Services, Inc.rpsins.com
We provide access to top insurance markets, coverage, and consulting services for independent insurance agents and brokers to meet client needs rapidly and efficiently |
1,721 |
| 6 | 710 | |
| 7 |
Artex Risk Solutionsartexrisk.com
Provider of innovative risk and capital management solutions worldwide through deep expertise, creative thinking, and a global network of professionals |
570 |
| 8 |
BBIbbinsight.com
Global analytics firm specializing in elegant data integrations, architecture, and data engineering Technology agnostic approach with expertise in IoT, cloud migration, DevOps, and data science |
534 |
| 9 |
Woodruff Sawyerajg.com
A leading insurance brokerage firm offering expert counsel and customized solutions to protect companies against critical risks globally |
448 |
| 10 |
VIVA USA Inc.viva-it.com
A certified Woman and Minority Owned technology and IT consulting company providing custom solutions, supplier diversity solutions, and staffing services to various industries |
368 |
| 11 |
Healthcare Plushcpcaregivers.com
Provider of licensed homemaker services in Illinois, offering skilled caregivers to provide assistance and care in the comfort of clients' homes |
347 |
| 12 |
Meadowbrook Insurance Agencyajg.com
A nationally recognized retail insurance agency providing a wide range of insurance products to protect clients' assets with a focus on risk management and community impact |
317 |
| 13 |
Iconstratusunlimited.com
A leading brand implementation company formed from a merger, focused on making a positive impact for clients and the world |
246 |
| 14 |
Associated Insurance and Risk Management Advisorsassocagencies.com
An experienced insurance and risk management advisor offering specialized plans for businesses and individuals with a commitment to exceptional service |
218 |
| 15 | 179 | |
| 16 |
Fleetmaticsverizonconnect.com
Global provider of mobile workforce solutions for service-based businesses, offering software to manage fleets and improve productivity through real-time data analysis |
177 |
| 17 |
Kelso-Burnett Co.kelso-burnett.com
A long-standing electrical contractor in Chicago area known for excellence and innovation, offering full-service electrical solutions in Illinois |
161 |
| 18 |
Epiq Solutionsepiqsolutions.com
Innovative company developing compact RF tools for RF situational awareness and defense applications, focusing on speed, cost, and performance |
158 |
| 19 |
Panasonic i-PRO Sensing Solutions Corporation of Americapanasonic.com
Global leader in advanced sensing technologies for Intelligent Surveillance, Public Safety, and Industrial/Medical Imaging, supporting professionals who protect and save lives |
150 |
| 20 |
Cedar Electronicscedarelectronics.com
Global supplier of connected automotive and consumer electronics solutions Specializing in radar/laser detectors, dash cams, CB radios, and driver alert applications Drive smarter and safer |
104 |
| 21 |
Clements Worldwide, a Gallagher Companyajg.com
An established insurance provider offering a wide range of coverage for expatriates and international organizations in over 170 countries |
92 |
| 22 |
EPAY Systemsepaysystems.com
A leading SaaS provider offering human capital management solutions for medium to large businesses, from recruiting to retirement, with transparent pricing |
85 |
| 23 |
OperationsIncajg.com
OperationsInc offers comprehensive HR solutions for businesses of all sizes, providing services such as HR consulting, talent acquisition, payroll administration, and staff training |
65 |
| 24 |
Siritek Incsiritek.com
A global IT services provider based in Chicago offering solutions, consulting, comprehensive IT support, computer networking, and custom software development to organizations worldwide |
62 |
| 25 |
Origin Specialty Underwritersorigin-specialty.com
Specialty insurance provider for small and mid-sized risks, offering tailored solutions, exceptional broker experience, and industry-specific coverages from financially secure carriers |
52 |
| 26 |
Staff IT Solutions Incstaffitsol.com
A global software product development firm specializing in US Staffing domain services with a focus on high-quality IT solutions tailored to clients' needs |
44 |
| 27 |
Nature's Care Companynaturescarecompany.com
This company provides high-quality, all-natural medical cannabis products to help treat various diseases and improve the quality of life for Illinois residents |
37 |
| 28 |
Desert Cactusamazon.com
This company licenses products for a wide range of brands and organizations including sports teams, colleges, universities, and military departments |
27 |
| 29 |
Komatsu America Corp. Parts Departmentkomatsu.com
Manufactures and markets integrated construction equipment, offers maintenance and repair components, and provides warranty-backed products globally through strategic parts distribution network |
27 |
| 30 |
ATS SORTIMAT USA LLC
They are a machinery company located in Rolling Meadows, Illinois, specializing in providing automated solutions for industrial sorting and material handling |
24 |
| 31 |
Radiss Tech Servicesradiss.com
Global IT consulting company specializing in Enterprise and managed services, web security, and cloud computing solutions for Fortune 500 enterprises across various industries |
21 |
| 32 |
Wealth Management Partnersajg.com
A comprehensive financial services firm offering wealth management, retirement planning, insurance, and strategic advice through partnerships with professional service providers |
21 |
| 33 |
BTS (Brokerage and Transportation Sales, Inc.)brokeragetransportation.com
A 3rd party logistics company founded in 1983, offering tailored transportation solutions with multiple services including LTL, truckload, intermodal, and expedited shipping |
17 |
| 34 |
Facility IT Groupfacilityitgroup.com
Consultative resource specializing in high availability Data Center and Telecom solutions Offers design, implementation, and cost-effective technology solutions with customer satisfaction as top priority |
11 |
| 35 |
Brokerage and Transportation Sales, Inc., a Ship OGRE Companyshipogre.com
Supply chain optimization, freight movement management, and cost savings through dedicated service, communication, and innovative technology for shippers nationwide |
11 |
| 36 | 8 | |
| 37 |
RELAY Business Management Services, LLCrelaybms.com
A global management consulting firm offering comprehensive services to optimize business operations, implement digital transformation, and drive innovation in a competitive market |
2 |
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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