The 50 largest privately held companies are listed. For the full list, please see the Crain's Chicago Book of Lists, available in the Office of Career Services.

U.S. Foodservice Inc. (Rosemont, IL)
Distributor of food and restaurant supplies

Reyes Holdings LLC (Rosemont, IL)
Food and beverage distributor

Topco Associates LLC (Skokie, IL)
Supplier of products and services to supermarket retailers, wholesalers, and food-service companies

Global Hyatt Corp. (Chicago, IL)
Hospitality

CDW Corp. (Vernon Hills, IL)
Computer hardware, software, and accessories

Ryerson Inc. (Chicago, IL)
Metal processor and distributor

OSI Group LLC (Aurora, IL)
Develops and processes food for food-service companies

Tribune Co. (Chicago, IL)
Owner of newspapers, television stations, websites, and other media

Eby-Brown Co. LLC (Naperville, IL)
Wholesale distributor of convenience products

Ace Hardware Corp. (Oak Brook, IL)
Retail hardware cooperative

Walsh Group Ltd. (Chicago, IL)
General contractor, design-builder, construction manager

Medline Industries, Inc. (Mundelein, IL)
Manufacturer and distributor of medical supplies

Amsted Industries Inc. (Chicago, IL)
Manufacturer of railroad, construction, and building materials

Follett Corp. (River Grove, IL)
Retail and wholesale distributor of education materials to K-12 and higher education markets

Heico Cos. LLC (Chicago, IL)
Buyout/turnaround firm specializing in manufacturing companies

Inland Real Estate Group (Oak Brook, IL)
Commercial real estate, investment, property management, leasing, development, and financial services

True Value Co. (Chicago, IL)
Retail hardware cooperative

Solo Cup Co. (Lake Forest, IL)
Manufacturer and distributor of single-use food-service products for operators and consumers 

Electro-Motive Diesel Inc. (LaGrange, IL)
Manufacturer of railroad locomotives and diesel components 

Koch Foods Inc. (Park Ridge, IL)
Supplier of fresh and frozen poultry for food-service and retail operations

Frank Consolidated Enterprises Inc. - Wheels Inc. (Des Plaines, IL)
Automotive fleet management

McMaster-Carr Supply Co. (Elmhurst, IL)
Wholesale supplier of industrial products

Wirtz Corp. (Chicago, IL)
Distribution, real estate, insurance, banking; owns Chicago Blackhawks hockey team

Central Grocers Inc. (Joliet, IL)
Grocery wholesaler with retail locations

Pepper Construction Group (Chicago, IL)
General construction, construction management

Crate & Barrel (Northbrook, IL)
Home furnishings retailer

Serta Inc. (Hoffman Estates, IL)
Manufacturer and marketer of mattresses and bed foundations 

Grant Thornton LLP (Chicago, IL)
Accounting

Pliant Corp. (Schaumburg, IL)
Manufacturing of flexible packaging products for food, beverage, personal care, medical and industrial uses

FreedomRoads LLC (Lincolnshire, IL)
Operates RV dealerships and Camping World stores

Duchossois Industries Inc. (Elmhurst, IL)
Military products, garage door openers, venture capital and private-equity investments

TTX Co. (Chicago, IL)
Provides rail car and rail car-related services

Goss International Inc. (Bolingbrook, IL)
Web offset printing press and postpress equipment manufacturer

Transunion LLC (Chicago, IL)
Credit data and financial services

CC Industries Inc. (Chicago, IL)
Holding company for diversified manufacturing and real estate operations

Network Services Co. (Schaumburg, IL)
Member-owned organization of janitorial products, food-service disposables and packaging and printing materials distributors

Sapa Group (formerly Indalex Holding Corp.) (Lincolnshire, IL)
Aluminum fabrication

Newly Weds Foods Inc. (Chicago, IL)
Manufacturer of food coatings and seasonings

Donlen Corp. (Northbrook, IL)
Fleet leasing and management

A.T. Kearney Inc. (Chicago, IL)
Management consulting

Phoenix International Freight Services Ltd. (Wood Dale, IL)
Logistics, transportation, customs brokerage

Boler Co./Hendrickson Intl. (Itasca, IL)
Manufacturer of truck and trailer suspension systems

Trustmark Cos. (Lake Forest, IL)
Health and life insurer, benefits administrator

Culligan International Co. (Rosemont, IL)
Residential and commercial water filtration systems

HUB International Ltd. (Chicago, IL)
Insurance brokerage

Nuveen Investments Inc. (Chicago, IL)
Investment services

MacLean-Fogg Co. (Mundelein, IL)
Manufacturer of engineered components for automotive and utility industries

SymphonyIRI Group (Chicago, IL)
Consumer, shopper and retail market information, analytics and technology

Midland Paper Co. (Wheeling, IL)
Wholesale distributor of printing paper, packaging materials and supplies

Old World Industries Inc. (Northbrook, IL)
Chemical manufacturer and consumer products marketer