Illinois Top Companies List by Market Cap as of August 2026

Federal Signal Corporation is a Leader in Innovative Equipment, Signaling Products and Communication and Security Systems that keep workers first responders and communities safe and secure company. It's products design teams, engineers, customer and technical support staff makes a trusted partner around the world. The headquarters is in USA.

Packaged foods company with headquarters is in USA.
Conagra has the most impactful, energized and inclusive culture in food. Conagra’s iconic brands, such as Birds Eye, Duncan Hines, Healthy Choice, Marie Callender's, Reddi-wip, and Slim Jim, as well as emerging brands, including Angie's BOOMCHICKAPOP, Duke's, Earth Balance, Gardein™, and Frontera, offer choices for every occasion.
As on 2022, CONAGRA BRANDS has 18,000 employees and 50 Approximately locations.
CONAGRA BRANDS annual revenue generated for period ending May-2022 was 11,535 million USD.

Provides auction services for old and damaged vehicles.

Ritchie Bros has acquired IAA Inc. for 7 billion USD in 2023. Post that it has been rebranded as RB Global and with brands Ritchies Bros, IAA, Rouse, SmartEquip and with ticker RBA.

Arcosa is a Infrastructure company. It is a provider of infrastructure related products and solutions with leading brands serving construction, energy and transportation markets in North America. The headquarters is in USA.

Ingredients is a Food Products company. The Company turns grains, fruits, vegetables and other plant based materials into value added ingredients solutions for the food, beverage, animal nutrition, brewing and industrial markets. It provide solutions and innovate for almost 60 industry sectors across more than 40 countries. The company products are sweeteners, starches, plant based proteins and unique ingredients from plant sources such as corn, tapioca, rice, sago and potato, peas, beans and lentils. The headquarters is in USA.

LKQ Corporation is an accessories automotive products and services company. It provides alternative collision replacement parts, transmissions, remanufactured engines and recycled engines.

The company offers replacement systems, components, heavy-duty trucks and parts for the repair of automobiles light and medium.

The headquarters is in USA.

As on 2022, LKQ Corporation has 44,000 employees.

LKQ Corporation annual revenue generated for period ending Dec-2022 was 12,794 million USD.

GATX Corporation is a Finest Railcar Leasing company. It has an interest in more than 1,18,000 railcars and over 600 locomotives. It operate through three business segments they are Rail North America, Rail International and Portfolio Management. Rail Russia owned 380 railcars including timber flat cars, woodchip gondolas, covered box wagons and different types of tanks for chemicals and food products as per 2019. The headquarters is in USA.

JBT Corporation is a Technology solutions company. It provider to high value segments of the food processing and air transportation industries and design, manufacture, test and service technologically sophisticated systems and products for customers. The headquarters is in USA.