This is a list of Illinois companies which includes notable companies that are headquartered in Illinois, or were previously headquartered in Illinois. In general, this list does not include companies headquartered in one of the municipalities of the Chicago metropolitan area.
Companies based in Illinois
A
Abbott Laboratories
Abbvie
Abt Electronics
Alliant Credit Union
Allstate
Alton Steel
American River Transportation Company
Anixter
Archer Daniels Midland
Astro-Physics
Axium Foods
Adams Street Partners
Arthur J. Gallagher & Co.
B
Basler Electric
Baxter
Beer Nuts
Believers Broadcasting Corporation
Bell Sports
Belly (loyalty program) BMO US BenchPrep Black Dog Books Braintree (company) Brewer Investment Group Brown County State Bank Bunn-O-Matic Corporation Busey Bank Byline Bank
C
Cars.com
CDW
Citizens Equity First Credit Union
City Water, Light & Power
Conagra Brands
Consolidated Communications
Country Financial
Credit Union 1
CME Group
Cboe Global Markets
CNA Financial
CIVC Partners
CF Industries
D
Dawn Equipment Company
Daxcon
Detonics
Discover Financial
Donnelley Financial Solutions
Dot Foods
Dover Corporation
E
Eli Bridge Company
Elliott Aviation
Estwing
Exelon
Essendant
F
Federal Signal Corporation
Ferrara Candy Company
Fieldglass
Follett Corporation
The Frantz Manufacturing Company
Frasca International
G
Gardner Denver
GE Healthcare
Glik's
GlobalTap
GoHealth
Golub Capital
Great Planes Model Manufacturing
Greenlee
Group O
Growmark
Groupon
Grubhub
GTCR
Growth Catalyst Partners
H
Harrisonville Telephone Company
Horace Mann Educators Corporation
Horizon Hobby
Hyatt
I
Ideal Industries
Illinois National Bank
IMC Financial Markets
Invenergy
Illinois Tool Works
J
Jimmy John's
JLL (company) John Deere Jenner & Block
K
Kress Corporation
Kraft Foods
Kraft Heinz
Kirkland & Ellis
Katten Muchin Rosenman
Kemper Corporation
L
Legacy Audio
Levi, Ray & Shoup
Lightbank
Life Fitness
M
Maui Jim
Madison Dearborn Partners
Meatheads Burgers & Fries
Metropolitan Educational Enterprises
Monical's Pizza
Morton Salt
Morningstar, Inc. Motorola Mobility Motorola Solutions Mondelez International Mrs. Fisher's McDonald's Mayer Brown McDermott Will & Emery Mesirow Financial
N
Nalco Holding Company
National Railway Equipment Company
Navistar International
Northern Trust
Nuveen
P
Pacific Bearing Company
Pactiv
ParkWhiz
Peoria Charter Coach Company
Pioneer Railcorp
Plochman's
Portillo's Restaurants
Potbelly Sandwich Shop
Peapod
Q
QCR Holdings
Quincy Media
R
RLI Corp. RR Donnelley Road Ranger Rock River Arms Rural King
S
Sears & Roebuck
Shakespeare Squared
Shaw Media
Skidmore, Owings & Merrill
SpotHero
Springfield Armory, Inc. STARadio Corporation State Farm Suburban Express Sidley Austin Safeway Insurance Group
T
Testor Corporation
Thoma Bravo
Titan Tire Corporation
Tower Hobbies
Trend Is Dead! Records
Tri-State Christian Television
U
United Airlines
Uptake (business)
V
Volition
Vivid Seats
W
Wahl Clipper
Walgreens Boots Alliance
Western Cartridge Company
West Monroe Partners
Wicks Organ Company
Wiss, Janney, Elstner Associates, Inc. Wolfram Research, Inc. Wrigley Company Wintrust Winston & Strawn