A-s Medication Solutions LLC | Libertyville | IL | Chemical Manufacturing325412 | — | ● ACTIVE |
| APAstellas Pharma Us, INC. | Northbrook | IL | Chemical Manufacturing325412 | 500+ | ● ACTIVE |
Atlas Fibre LLC | Northbrook | IL | Plastics and Rubber Products Manufacturing326130 | — | ● ACTIVE |
| APAurora Packing CO | North Aurora | IL | Food Manufacturing311611 | 100-499 | ● ACTIVE |
Auto Truck Group LLC | Bartlett | IL | Transportation Equipment Manufacturing336211 | — | ● ACTIVE |
Avanti Engineering INC | Glendale Heights | IL | Fabricated Metal Product Manufacturing332710 | — | ● ACTIVE |
Avers Machine and Gear INC. | Schiller Park | IL | Machinery Manufacturing333612 | — | ● ACTIVE |
Award Emblem Manufacturing CO INC | Bolingbrook | IL | Miscellaneous Manufacturing339910 | — | ● ACTIVE |
Awerkamp Machine CO | Quincy | IL | Fabricated Metal Product Manufacturing332710 | — | ● ACTIVE |
B a Die Mold, INC. | Aurora | IL | Machinery Manufacturing333511 | — | ● ACTIVE |
| BMBag Makers INC | Union | IL | Printing and Related Support Activities323111 | 100-499 | ● ACTIVE |
Bales Mold Service, INC. | Downers Grove | IL | Fabricated Metal Product Manufacturing332813 | — | ● ACTIVE |
Ballco Manufacturing Company, INC. | Aurora | IL | Fabricated Metal Product Manufacturing332710 | 20-99 | ● ACTIVE |
| BBBard Brachytherapy INC | Carol Stream | IL | Miscellaneous Manufacturing339113 | 20-99 | ● ACTIVE |
Barrington Automation LTD | Lake in the Hills | IL | Fabricated Metal Product Manufacturing332999 | — | ● ACTIVE |
Basler Electric Company, LLC | Highland | IL | Computer and Electronic Product Manufacturing334419 | — | ● ACTIVE |
Becker Brothers Graphite CORP | Maywood | IL | Electrical Equipment, Appliance & Component Manufacturing335991 | — | ● ACTIVE |
| BTBelden Tools INC | Hillside | IL | Machinery Manufacturing333613 | — | ● ACTIVE |
| BFBell Flavors & Fragrances INC | Northbrook | IL | Food Manufacturing311612 | — | ● ACTIVE |
Bernard Food Industries INC | Evanston | IL | Food Manufacturing311423 | 20-99 | ● ACTIVE |
| BCBest Chicago Meat Company, LLC | Chicago | IL | Food Manufacturing311612 | 100-499 | ● ACTIVE |
| BBBig Bolt, LLC | Bloomingdale | IL | Fabricated Metal Product Manufacturing332722 | — | ● ACTIVE |
Bourn & Koch, INC. | Rockford | IL | Machinery Manufacturing333517 | 20-99 | ● ACTIVE |
Bowman Analytics, INC. | Schaumburg | IL | Computer and Electronic Product Manufacturing334516 | — | ● ACTIVE |
| BFBrad Foote Gear Works, INC | Cicero | IL | Machinery Manufacturing333612 | — | ● ACTIVE |
| BIBranding Iron Holdings - Holten Meat | Sauget | IL | Food Manufacturing311612 | 100-499 | ● ACTIVE |
Britt Industries, INC | Arlington Heights | IL | Chemical Manufacturing325510 | — | ● ACTIVE |
| BWBrook & Whittle-northbrook | Northbrook | IL | Printing and Related Support Activities323111 | 20-99 | ● ACTIVE |
B T M Industries INC | Woodstock | IL | Fabricated Metal Product Manufacturing332710 | — | ● ACTIVE |
Burns Machine CO | Ottawa | IL | Fabricated Metal Product Manufacturing332710 | — | ● ACTIVE |
| BIBycap INC | Chicago | IL | Computer and Electronic Product Manufacturing334416 | 20-99 | ● ACTIVE |
| CTCain Tubular Products, INC | Saint Charles | IL | Primary Metal Manufacturing331210 | — | ● ACTIVE |
| CSCanam Steel CORP | Peru | IL | Fabricated Metal Product Manufacturing332312 | 20-99 | ● ACTIVE |
| CBCarl Buddig & Company | Montgomery | IL | Food Manufacturing311612 | — | ● ACTIVE |
Carstens, Incorporated | Harwood Heights | IL | Miscellaneous Manufacturing339112 | — | ● ACTIVE |
Catalytic Products International INC | Lake Zurich | IL | Fabricated Metal Product Manufacturing332999 | — | ● ACTIVE |
Cat-i Manufacturing INC. | South Elgin | IL | Nonmetallic Mineral Product Manufacturing327212 | — | ● ACTIVE |
| CACck Automations, LLC | Jacksonville | IL | Computer and Electronic Product Manufacturing334418 | 100-499 | ● ACTIVE |
C & C Power INC | Carol Stream | IL | Electrical Equipment, Appliance & Component Manufacturing335311 | — | ● ACTIVE |
C E Niehoff & CO | Evanston | IL | Transportation Equipment Manufacturing336320 | — | ● ACTIVE |
Central Wire, INC. | Union | IL | Primary Metal Manufacturing331222 | 20-99 | ● ACTIVE |
Century Metal Spinning CO | Bensenville | IL | Fabricated Metal Product Manufacturing332119 | 20-99 | ● ACTIVE |
| CGCg Global Systems Corporation | Lake Zurich | IL | Fabricated Metal Product Manufacturing332313 | — | ● ACTIVE |
| CMCherry Meat Packers, INC | Chicago | IL | Food Manufacturing311611 | — | ● ACTIVE |
Chicago Anodizing CO | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ● ACTIVE |
Chicago Booth Manufacturing INC | Chicago | IL | Furniture and Related Product Manufacturing337127 | 20-99 | ● ACTIVE |
| CMChicago Metal Rolled Products Company | Chicago | IL | Primary Metal Manufacturing331221 | 20-99 | ● ACTIVE |
| CMChucking Machine Products, INC. | Franklin Park | IL | Fabricated Metal Product Manufacturing332710 | 20-99 | ● ACTIVE |
Classic Products INC | Mchenry | IL | Fabricated Metal Product Manufacturing332613 | — | ● ACTIVE |
Clear Armor, LLC | Grayslake | IL | Plastics and Rubber Products Manufacturing326130 | 20-99 | ● ACTIVE |