These Illinois-based subscription businesses include large enterprises and mid-sized firms across diverse sectors. Health Care Service Corporation provides health coverage, while Exelon is a utility company. Morningstar offers investment insights and data, and Camping World retails RVs and accessories. Paylocity delivers cloud-based HR and payroll software, and Cision specializes in media intelligence.
The data reveals a strong concentration of headquarters in Chicago, with the majority of the largest companies based in the city. The companies span industries such as healthcare, utilities, financial services, retail, and a notable presence of software development firms.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Health Care Service Corporationhcsc.com
Provides health coverage for employers, individuals, and families, including Medicare and Medicaid plans, plus related health care products and services. |
21,090 | |||
| 2 |
Exelonexeloncorp.com
A leading utility company providing reliable and affordable energy to over 10 million customers in urban areas across multiple states, with a commitment to sustainability and community support |
20,291 | |||
| 3 |
Morningstarmorningstar.com
Independent investment insights, data, and research for various global markets including managed products, private capital, debt securities, and comprehensive asset management services. |
12,028 | |||
| 4 |
Camping Worldcampingworld.com
A nationwide retailer offering RVs, accessories, services, and expert advice to enhance RV and outdoor experiences since 1966 |
7,755 | |||
| 5 |
Paylocitypaylocity.com
Award-winning provider of cloud-based HR and payroll software solutions, helping businesses automate processes, attract talent, and build employee connections |
7,046 | |||
| 6 |
Cisioncision.com
A global leader in media intelligence and communication solutions, equipping professionals with tools to excel in today's data-driven world |
3,839 | |||
| 7 |
Cooper's Hawk Winery and Restaurantschwinery.com
An elegant tasting room and scratch kitchen restaurant chain with a large wine club, multiple locations, award-winning wines, and celebrity partnerships |
3,605 | |||
| 8 |
Applied Systemswww1.appliedsystems.com
A leading provider of innovative cloud software for the insurance industry, driving transformation through digitization, automation, and new partnerships |
2,813 | |||
| 9 |
Chamberlain Groupchamberlaingroup.com
A global leader in intelligent access technology, providing seamless, secure access to homes and businesses through innovative products and software solutions |
2,781 | |||
| 10 |
Home Chefhomechef.com
Innovative meal kit company fostering autonomy, creativity, and growth for employees Award-winning team focused on customer satisfaction and fun work environment |
2,766 | |||
| 11 |
American Marketing Associationama.org
Provides marketing and sales professionals with industry insights, professional certification, academic journals, training, and conferences through a global community. |
2,669 | |||
| 12 |
CCC Intelligent Solutionscccis.com
Cloud platform delivering AI-driven solutions connecting insurers, repairers, automakers, and suppliers for optimized insurance and claims experiences. |
2,417 | |||
| 13 |
Flexeraflexera.com
Provides comprehensive visibility and actionable insights on entire IT ecosystems, enabling organizations to optimize spend, mitigate risk, and achieve positive business outcomes. |
2,096 | |||
| 14 |
Society of Women Engineerslinktr.ee
A not-for-profit organization empowering women in engineering through training, scholarships, networking, and advocacy to advance in the field |
1,881 | |||
| 15 |
Relativityrelativity.com
A software company offering RelativityOne, a SaaS product for data organization, truth discovery, and action during litigation and investigations in various sectors globally |
1,856 | |||
| 16 |
Sprout Social, Inc.sproutsocial.com
Global leader providing social media management, publishing, engagement, customer care, advocacy, and AI-powered business intelligence software to over thirty thousand brands worldwide. |
1,771 | |||
| 17 |
American College of Surgeonsfacs.org
Dedicated to improving surgical patient care worldwide with membership opportunities, quality programs, surgical registries, and education to enhance outcomes |
1,644 | |||
| 18 |
American Dental Associationada.org
Advocates for dentists, dental science, public oral health. Provides resources for professionals, researches, and champions public health initiatives. |
1,599 | |||
| 19 |
Literalitera.com
It specializes in legal technology, offering AI-driven solutions for document management, due diligence, and collaboration for legal teams globally. |
1,535 | |||
| 20 | 1,509 | ||||
| 21 |
Spherasphera.com
Sphera provides ESG performance and risk management software, data, and consulting services for EHS&S, operational risk, product stewardship, and SCRM |
1,448 | |||
| 22 |
Trading Technologiestradingtechnologies.com
Provider of SaaS trading platform connecting global exchanges, offering tools for execution, risk management, analytics, and post-trade services. |
1,428 | |||
| 23 |
Protection 1 Security Solutionsprotection1.com
A leading company in the electronic security industry, formed through a merger, on the way to complete integration and becoming unified |
1,399 | |||
| 24 | 1,378 | ||||
| 25 |
College of American Pathologists (CAP)cap.org
An organization of pathologists dedicated to excellence in pathology and laboratory medicine, advocating for health advancements and shaping the future of healthcare |
1,297 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 26 |
iManageimanage.com
The company provides an intelligent, cloud-enabled knowledge work platform using AI to uncover and activate organizational content for informed decisions and collaboration |
1,276 | |||
| 27 |
PreSales Collectivepresalescollective.com
The company aims to elevate the role of PreSales globally by providing resources, knowledge, networking, and mentorship for career development in PreSales |
1,202 | |||
| 28 |
American Academy of Pediatricsaap.org
A professional membership organization of pediatricians dedicated to promoting the health and well-being of infants, children, adolescents, and young adults through advocacy and education |
1,198 | |||
| 29 |
Factor_factor75.com
This company offers no-nonsense, chef-prepared meals made with ingredients of integrity, expert-approved nutrition, and restaurant-quality cuisine for people on the go |
1,140 | |||
| 30 |
Jewel Food Storesjewelosco.com
A grocery company with a rich history, offering a wide range of products at fair prices with a focus on customer care |
1,130 | |||
| 31 |
West Unified Communications Serviceswestuc.com
This company develops cloud-based technology for enterprise collaboration, offering solutions like conferencing, team collaboration, and cloud contact center services |
1,068 | |||
| 32 |
Daniels Healthdanielshealth.com
A global leader in healthcare innovation, providing safer solutions for medical waste management, with a focus on sustainability and staff safety |
1,064 | |||
| 33 |
Big Ten Networklinktr.ee
An internationally distributed network covering the Big Ten Conference, providing 24/7 coverage of over 2,300 events for fans and alumni nationwide |
1,060 | |||
| 34 |
SITEsiteglobal.com
Global organization supporting incentive travel industry, connecting travel to business results with professional development, certification, and business connections for members worldwide |
1,049 | |||
| 35 |
XSport Fitnessxsportfitness.com
A rapidly expanding fitness chain offering top-of-the-line equipment, personal training, educational programs, dietary supplements, and fitness apparel at various locations |
1,046 | |||
| 36 |
Origami Riskorigamirisk.com
Innovative provider of integrated risk, compliance, safety, healthcare, and P&C insurance SaaS solutions for various industries worldwide |
1,011 | |||
| 37 |
Modern Healthcaremodernhealthcare.com
Leading source of healthcare news, providing in-depth analysis and insights on industry events, trends, and research through various platforms for healthcare executives |
893 | |||
| 38 |
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 | |||
| 39 |
ActiveCampaignactivecampaign.com
Customer experience automation platform offering pre-built automations, CRM, email marketing, and integrations for personalized multi-channel customer engagement. |
840 | |||
| 40 |
Chicago Tribune Media Groupchicagotribune.com
Provides diverse media and marketing solutions reaching millions monthly through newspapers, digital platforms, and niche regional publications in Chicago area. |
825 | |||
| 41 |
project44project44.com
Transforms fragmented logistics management into unified intelligence, bringing certainty to global supply chain operations with intelligent transportation, end-to-end visibility, yard management and last mile solutions. |
809 | |||
| 42 |
IPCelectronics.org
An industry association guiding electronics manufacturing through changes, providing standards, training, research, and advocacy to support global industry success |
782 | |||
| 43 |
Keeper Security, Inc.keepersecurity.com
Provides a unified, cloud-native cybersecurity platform protecting users, devices, and infrastructure from cyber attacks with zero-knowledge and zero-trust security. |
772 | |||
| 44 |
Netrix Globalnetrixglobal.com
A global provider of cybersecurity, application development, and IT managed services, recognized for its award-winning solutions |
771 | |||
| 45 |
Impact Networking, LLCimpactmybiz.com
Providing expert-driven managed services including IT, cybersecurity, marketing, AI, and digital transformation to help businesses grow and succeed. |
764 | |||
| 46 |
American College of Healthcare Executivesache.org
An organization advancing healthcare leadership excellence through lifelong learning, integrity, diversity, and inclusion, offering valuable knowledge, networking opportunities, and professional development |
734 | |||
| 47 |
AVMA (American Veterinary Medical Association)avma.org
A leading advocate for the veterinary profession, promoting and advancing the needs of veterinarians and animals through advocacy, education, and accreditation programs |
705 | |||
| 48 | 702 | ||||
| 49 |
Park Lane Jewelryparklanejewelry.com
A direct sales jewelry company founded in 1955, offering quality jewelry with career opportunities for women, weekly pay, and unlimited incentives |
695 | |||
| 50 | 677 | ||||
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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 Nov 11, 2026.
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The same list elsewhere in United States
- Subscription businesses in the United States 3,923
- Subscription businesses in California 940
- Subscription businesses in New York State 485
- Subscription businesses in Texas 310
- Subscription businesses in Florida 202
- Subscription businesses in Massachusetts 183
- Subscription businesses in Virginia 114
- Subscription businesses in Colorado 108
- Subscription businesses in Alabama 104
- Subscription businesses in Georgia 103
- Subscription businesses in Pennsylvania 90
- Subscription businesses in Utah 89
- Subscription businesses in Washington State 86
- Subscription businesses in New Jersey 85
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- Subscription businesses in North Carolina 62
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- Subscription businesses in San Francisco 323
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- Subscription businesses in Chicago 92
- Subscription businesses in Boston 87
- Subscription businesses in Atlanta 66
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- Subscription businesses in Los Angeles 60