| IEIms Engineered Products LLC | Des Plaines | IL | Fabricated Metal Product Manufacturing332322 | — | ▲ REPORTED CLOSED |
| IFIndustrial Finishing INC | Franklin Park | IL | Fabricated Metal Product Manufacturing332812 | 1-19 | ◐ LIKELY ACTIVE |
| IHIndustrial Hard Chrome LTD | Geneva | IL | Fabricated Metal Product Manufacturing332813 | 20-99 | ◐ LIKELY ACTIVE |
Industrial Motion Control, LLC | Wheeling | IL | Fabricated Metal Product Manufacturing332999 | — | ◐ LIKELY ACTIVE |
| ILInpro/seal LLC | Rock Island | IL | Fabricated Metal Product Manufacturing332999 | 100-499 | ◐ LIKELY ACTIVE |
| JMJustrite Manufacturing CO | Mattoon | IL | Fabricated Metal Product Manufacturing332431 | 100-499 | ◐ LIKELY ACTIVE |
| KTKenmode Tool & Engineering | Algonquin | IL | Fabricated Metal Product Manufacturing332116 | 100-499 | ◐ LIKELY ACTIVE |
| LFLarson Forgings | Chicago | IL | Fabricated Metal Product Manufacturing332111 | — | ◐ LIKELY ACTIVE |
| LMLaystrom Manufacturing CO. | Chicago | IL | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| LIL&n Industries INC | Rushville | IL | Primary Metal Manufacturing331110 | 1-19 | ◐ LIKELY ACTIVE |
| MBMba Building Supplies, INC. | Libertyville | IL | Fabricated Metal Product Manufacturing332114 | 100-499 | ◐ LIKELY ACTIVE |
| MSMcbride & Shoff INC | Metamora | IL | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| MAMetals and Services INC. | Addison | IL | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| MIMetamora Industries, LLC | Metamora | IL | Wood Product Manufacturing321920 | 20-99 | ◐ LIKELY ACTIVE |
| MCMetform CORP | Savanna | IL | Fabricated Metal Product Manufacturing332111 | — | ◐ LIKELY ACTIVE |
| MCMj Celco | Schiller Park | IL | Fabricated Metal Product Manufacturing332116 | 100-499 | ◐ LIKELY ACTIVE |
| MPModern Plating CORP | Freeport | IL | Fabricated Metal Product Manufacturing332813 | 20-99 | ◐ LIKELY ACTIVE |
| MOMorgan Ohare INC | Addison | IL | Fabricated Metal Product Manufacturing332811 | 20-99 | ◐ LIKELY ACTIVE |
| MIMorton Industries LLC | Morton | IL | Primary Metal Manufacturing331210 | 100-499 | ◐ LIKELY ACTIVE |
| NPNobert Plating CO | Chicago | IL | Fabricated Metal Product Manufacturing332813 | 20-99 | ◐ LIKELY ACTIVE |
| NPNobert Plating CO | Chicago | IL | Fabricated Metal Product Manufacturing332813 | 20-99 | ◐ LIKELY ACTIVE |
| PCParsons CO INC | Roanoke | IL | Fabricated Metal Product Manufacturing332812 | 100-499 | ◐ LIKELY ACTIVE |
| PMPaul's Machine and Welding Corp | Villa Grove | IL | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| PPPerfection Plating INC | Elk Grove Village | IL | Fabricated Metal Product Manufacturing332813 | 100-499 | ◐ LIKELY ACTIVE |
| PPPrecision Plating CO | Chicago | IL | Fabricated Metal Product Manufacturing332813 | 100-499 | ◐ LIKELY ACTIVE |
| PSProgressive Steel Treating, INC | Loves Park | IL | Fabricated Metal Product Manufacturing332618 | 1-19 | ◐ LIKELY ACTIVE |
| PGProphet Gear CO. | Prophetstown | IL | Fabricated Metal Product Manufacturing332117 | 1-19 | ◐ LIKELY ACTIVE |
| QMQuincy Metal Fabricators | Quincy | IL | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| RGRaynor Garage Doors | Dixon | IL | Fabricated Metal Product Manufacturing332311 | 500+ | ◐ LIKELY ACTIVE |
| RMRf Mau CO | Lincolnwood | IL | Fabricated Metal Product Manufacturing332721 | 20-99 | ◐ LIKELY ACTIVE |
| RSRockford Spring CO | Rockford | IL | Fabricated Metal Product Manufacturing332613 | 20-99 | ◐ LIKELY ACTIVE |
| RCRollex CORP | Elk Grove Village | IL | Primary Metal Manufacturing331524 | 100-499 | ◐ LIKELY ACTIVE |
| RPRovanco Piping System Inc-treatment Plant | Joliet | IL | Fabricated Metal Product Manufacturing332996 | 20-99 | ◐ LIKELY ACTIVE |
| SPSchultes Precision Manufacturing INC | Buffalo Grove | IL | Fabricated Metal Product Manufacturing332710 | 100-499 | ▲ REPORTED CLOSED |
| SSSeward Screw LLC | Seward | IL | Fabricated Metal Product Manufacturing332710 | 100-499 | ◐ LIKELY ACTIVE |
| SKSimmons Knife & Saw | Glendale Heights | IL | Fabricated Metal Product Manufacturing332216 | 20-99 | ◐ LIKELY ACTIVE |
| SISimplex INC | Springfield | IL | Fabricated Metal Product Manufacturing332322 | 100-499 | ◐ LIKELY ACTIVE |
| SMSoudan Metals Company INC. | Chicago | IL | Primary Metal Manufacturing331221 | 20-99 | ◐ LIKELY ACTIVE |
| SLSternberg Lighting | Roselle | IL | Fabricated Metal Product Manufacturing332812 | 100-499 | ◐ LIKELY ACTIVE |
| SISwd INC | Addison | IL | Fabricated Metal Product Manufacturing332812 | 100-499 | ◐ LIKELY ACTIVE |
| SSSwenson Spreader CO | Lindenwood | IL | Fabricated Metal Product Manufacturing332322 | 100-499 | ◐ LIKELY ACTIVE |
| TTTangent Technologies LLC | Aurora | IL | Plastics and Rubber Products Manufacturing326199 | 100-499 | ◐ LIKELY ACTIVE |
| TITc Industries | Crystal Lake | IL | Fabricated Metal Product Manufacturing332811 | 100-499 | ◐ LIKELY ACTIVE |
| TCThyssenkrupp Crankshaft CO | Danville | IL | Fabricated Metal Product Manufacturing332111 | 20-99 | ◐ LIKELY ACTIVE |
| TATower Automotive Operations USA I LLC | Chicago | IL | Fabricated Metal Product Manufacturing332812 | 100-499 | ◐ LIKELY ACTIVE |
| TCTri C CO INC | Eureka | IL | Fabricated Metal Product Manufacturing332710 | 1-19 | ◐ LIKELY ACTIVE |
| THTri-city Heat Treat CO | Rock Island | IL | Fabricated Metal Product Manufacturing332811 | 20-99 | ◐ LIKELY ACTIVE |
| UCUS Chrome CORP of Illinois | Kingston | IL | Fabricated Metal Product Manufacturing332813 | 20-99 | ◐ LIKELY ACTIVE |
| WTWauconda Tool & Engineering | Algonquin | IL | Fabricated Metal Product Manufacturing332119 | 20-99 | ◐ LIKELY ACTIVE |
| WMWieland Metals INC | Wheeling | IL | Primary Metal Manufacturing331420 | 20-99 | ◐ LIKELY ACTIVE |