| # | Company | Employees |
|---|---|---|
| 1 |
OSF HealthCareosfhealthcare.org
Integrated health system with hospitals, home care, nursing colleges, digital health services, philanthropic foundation, and healthcare innovation investments. |
12,433 |
| 2 |
Advanced Technology Services (ATS)advancedtech.com
Industrial maintenance, technology, and parts provider with expertise in contract maintenance, support, training, monitoring, and management for manufacturers across various industries |
2,436 |
| 3 |
Bradley Universitybradley.edu
Bradley University offers a wide range of undergraduate and graduate programs in various fields, focusing on innovation, excellence, and embracing progress |
2,099 |
| 4 |
RLI Insurance Companyrlicorp.com
Specialty insurer focusing on niche property, casualty, and surety markets, providing customized insurance products and superior customer service. |
1,430 |
| 5 |
Peoria Public Schoolspeoriapublicschools.org
Transforming Peoria Public Schools by emphasizing high standards, personalized instruction, technology integration, diverse curriculum, and community partnerships for student success in a global economy |
1,325 |
| 6 |
City of Peoria, Arizonapeoriaaz.gov
A dynamic desert community in Peoria, Arizona with top-notch schools, award-winning facilities, and an enticing variety of shopping, dining, and entertainment options |
1,094 |
| 7 |
SC2 Services, Inc.sc2services.com
The company offers customized services like fulfillment, industrial painting, reverse logistics, and kitting They focus on providing quality and value-added solutions |
823 |
| 8 |
Maui Jim Sunglassescareers.mauijim.com
Design and manufacture polarized sunglasses with advanced lens technology, providing UV protection, glare reduction, and enhanced visual clarity worldwide. |
709 |
| 9 |
Bucyrus Internationalcat.com
A leading manufacturer of mining equipment and technology products, providing services to enhance safety, efficiency, productivity, and cost reduction for global mineral producers |
627 |
| 10 | 607 | |
| 11 |
RI Internationalrecoveryinnovations.org
The company specializes in crisis, health, recovery, and consulting services including programs for mental health, addiction, peer support, and global training |
599 |
| 12 |
MH Equipment Companymhequipment.com
A leading material handling service provider with 38 locations in the US, known for organic growth, acquisitions, diversity, and geographic reach |
573 |
| 13 |
Vonachen Groupvonachengroup.com
Established in 1968, this family-owned company provides janitorial, healthcare, logistics, and special services in multiple states, focusing on quality, integrity, and client satisfaction |
542 |
| 14 |
Christ's Church of the Valleyccv.church
A church community that introduces people to Christ, encourages growth, and values individuals for their unique contributions to the Kingdom |
446 |
| 15 |
University of Illinois College of Medicine Peoriapeoria.medicine.uic.edu
A medical school campus that educates medical students, physician residents, and physicians in a rigorous curriculum with hands-on experience and research opportunities |
386 |
| 16 |
Illinois Mutualillinoismutual.com
A longstanding family-owned insurance company offering life, disability, and worksite insurance products with strong financial ratings and employee-friendly benefits |
324 |
| 17 |
Heyl Roysterheylroyster.com
Regional law firm with over 100 lawyers across seven offices in Illinois and Missouri, offering legal services to businesses, professionals, healthcare organizations, and more |
310 |
| 18 |
Peoria County Governmentpeoriacounty.gov
Peoria County oversees a range of essential services for its population, including law enforcement, public health, animal control, and veterans assistance |
307 |
| 19 |
EVO Transportationevotransinc.com
A rapidly growing transportation provider for the US Postal Service prioritizing customer and driver care, innovation, sustainability, efficiency, and driver-centric culture |
277 |
| 20 |
The Center for Youth and Family Solutionscyfsolutions.org
This organization provides trauma-informed social services to individuals and families coping with trauma, abuse, neglect, and other challenges through six core programs |
272 |
| 21 |
Pointcorepointcore.com
A healthcare organization offering technology, healthcare technology, supply chain, and construction services to hospitals and clinics for optimal care delivery |
232 |
| 22 |
Antigua Apparelantiguaapparelshop.com
A leading designer and marketer of men's and women's lifestyle apparel and sportswear for Golf, Licensed Sports, Corporate, and Specialty Retail markets |
195 |
| 23 |
TRIGO SCSIscsinternational.com
A global supply chain solutions provider offering tailored services, quality support, vendor managed inventory, and customer-focused programs to OEMs and suppliers worldwide |
181 |
| 24 |
Professional Therapy Services, Inc.ptsinc.org
The company offers ethical and collaborative rehabilitation therapies, focusing on improving patients' lives through compassionate care, excellence, and innovation |
180 |
| 25 |
Dunlap Community Unit School District #323dunlapcusd.net
A premier public school district in the Peoria area, serving 4,500 students and 12,500 residents from various communities |
177 |
| 26 |
Comprehensive Prosthetics & Orthotics (CPO)cpousa.com
A company with 24+ offices and 130+ employees specializing in providing custom Orthotic and Prosthetic devices to improve patients' quality of life |
177 |
| 27 |
Simantelsimantel.com
A B2B marketing agency with over 40 years of experience, using insight to create engaging campaigns for global brands online and offline |
176 |
| 28 |
O'Brien Steel Serviceobriensteel.com
A steel service company established in 1975, offering a vast inventory of carbon steel, delivery services, and processing capabilities to meet customer needs |
170 |
| 29 |
Company Aquiredkci-corp.com
A leading steel manufacturer in the US, producing 700,000 tons annually with a focus on recycling and maintaining quality and consistency |
169 |
| 30 |
One Step Beyond, Inc.osbi.org
Empowering individuals with Intellectual Disabilities to achieve independence, employment, social connection, and community participation Vision for full inclusion and recognition of abilities |
167 |
| 31 |
Advanced Medical Transportamtci.org
A not-for-profit emergency and scheduled ambulance service focused on community benefit, dedicated to saving lives |
163 |
| 32 |
Cardiac Solutionscardiacsolutions.net
A physician-owned cardiac health provider offering innovative treatments, personalized care, and preventative services to establish a leading cardiology team |
153 |
| 33 |
Younger Brothers Companiesyoungerbrothers.com
A construction company based in the Phoenix area, focusing on building and renovating various structures for residential and commercial clients |
147 |
| 34 |
โorganix-IT | Next Generation IT Solutionsorganix-it.com
This company specializes in affordable and comprehensive IT solutions including mobile app development, web design, SEO, and eCommerce services with dedicated support |
20 |
| 35 |
HARVIN TECHNOLOGIES LLCharvintek.com
This firm specializes in connecting top IT professionals with companies, elevating workforce potential with cutting-edge recruitment strategies and industry expertise |
19 |
| 36 |
ITC Inc.itccnc.com
A company with over 15 years of experience supporting manufacturing industries worldwide, providing services such as engineering, design, programming, maintenance, and more |
19 |
| 37 |
Skinner AgSolutions, Inc.skinneragsolutions.com
A leading provider of custom-engineered equipment solutions for dairy and hog waste management, specializing in the Ag Waste/Biogas industry |
9 |
| 38 |
Black Mountain Investment Companyblackmtnco.com
National investment firm with diverse portfolio including aerospace, real estate, construction, debt instruments, intellectual property, software, and minority positions in companies Led by invested executives |
8 |
| 39 |
SW Electric INCsw-electricinc.com
A transparent and honest renewable energy company offering superior energy solutions to residential and commercial customers |
6 |
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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