Illinois Top Companies List by Market Cap as of August 2026

CCC Intelligent Solutions Holdings is a technology leader pioneering solutions company that power insurers, automotive manufacturers, collision repairers, parts suppliers, lenders, fleet operators and more through advanced cloud based SaaS platform of digital and data services. It is the gold standard and provider of vehicle valuations in the USA processing 3.5 million valuation annually and 2,375 employees as on 2022. The headquarters is in USA.

Option Care Health is a Exceptional Infusion Therapy Services company. It provide extraordinary care that changes lives through a comprehensive approach to care along every step of the infusion therapy process including intake coordination, insurance authorization, resources for financial assistance, education and customized treatments. The company commitment to clinical excellence are those between team of more than 2,900 clinicians and the patients they serve. The headquarters is in USA.

Cushman & Wakefield provides real estate services, property leasing services and facility support services. As on 2019 they have 53,000 employees across 60 countries.

CALAMOS STRATEGIC TOTAL RETURN FUND is a mutual fund company, and the fund is managed by Calamos Advisors LLC. It invests in the public equity and fixed income markets of the United States.

Calamos Strategic Total Return Fund was formed on December 31, 2003 and Headquarters is in the United States.

Atkore Inc is a Provider of Electrical, Safety and Infrastructure Solutions company. It is having approximately 3,900 employees and 66 manufacturing and distribution facilities worldwide. The company products are electrical products and mechanical products. The headquarters is in USA.

Tootsie Roll Industries is a Candy company. It brands include some of the most familiar candy names they are Tootsie Roll, Tootsie Pop, Charms Blow Pop, Mason Dots, Andes, Sugar Daddy, Charleston Chew, Dubble Bubble, Razzles, Caramel Apple Pop, Junior Mints, Cella's Chocolate Covered Cherries, and Nik-L-Nip. The headquarters is in USA.