Induction Heat Treating CORP. | Crystal Lake | 20–99 | ● ACTIVE |
Scot Forge Company | Spring Grove | — | ● ACTIVE |
Barrington Automation LTD | Lake in the Hills | — | ● ACTIVE |
B T M Industries INC | Woodstock | — | ● ACTIVE |
Classic Products INC | Mchenry | — | ● ACTIVE |
M-1 Tool Works, INC. | Mchenry | 20–99 | ● ACTIVE |
Minic Industries INC | Crystal Lake | — | ● ACTIVE |
Alubend USA LLC | Woodstock | — | ● ACTIVE |
D5 Ranges, INC. | Union | — | ● ACTIVE |
Duraflex INC | Cary | — | ● ACTIVE |
| EPEconomy Power Transmission Sales LLC | Mchenry | — | ● ACTIVE |
Flex-weld INC | Woodstock | — | ● ACTIVE |
G & M Manufacturing CORP | Crystal Lake | — | ● ACTIVE |
Magnum Machining LLC | Richmond | — | ● ACTIVE |
Minic Precision, INC. | Spring Grove | — | ● ACTIVE |
Precision Waterjet & Laser LLC | Crystal Lake | — | ● ACTIVE |
Royal Coil INC | Woodstock | — | ● ACTIVE |
Serien Manufacturing, INC. | Woodstock | — | ● ACTIVE |
The Arnold Engineering CO | Woodstock | — | ● ACTIVE |
| TITc Industries | Crystal Lake | 100–499 | ◐ LIKELY ACTIVE |
| WTWauconda Tool & Engineering | Algonquin | 20–99 | ◐ LIKELY ACTIVE |
| EIErect-a-tube INC | Harvard | 20–99 | ◐ LIKELY ACTIVE |
| GMG & M Mfg CORP | Crystal Lake | — | ◇ UNVERIFIED |
| GPGrove Plating CO INC | Fox River Grove | — | ◇ UNVERIFIED |
| VCVorteq Coil Finishers LLC | Woodstock | — | ◇ UNVERIFIED |
| WMWerner Manufacturing Services of Il INC | Crystal Lake | — | ◇ UNVERIFIED |
| CDCharter Dura-bar, INC. | Woodstock | — | ◐ LIKELY ACTIVE |
| KTKenmode Tool & Engineering | Algonquin | — | ◐ LIKELY ACTIVE |
| MAM.s. Action Machining CORP | Mchenry | 20–99 | ◐ LIKELY ACTIVE |
| AMAubrey Manufacturing INC | Union | — | ◇ UNVERIFIED |
| BPBrownies Polishing Shop | Ringwood | — | ◇ UNVERIFIED |
| CPChromold Plating INC | Mchenry | — | ◇ UNVERIFIED |
| CMCoffman Mfg CORP | Cary | — | ◇ UNVERIFIED |
| MCMaclean-fogg Component Solutions | Richmond | — | ◇ UNVERIFIED |
| MIMcgill INC | Marengo | — | ◇ UNVERIFIED |
| SDServ-all Die & Tool CO. | Crystal Lake | — | ◇ UNVERIFIED |
| SCSinterloy CORP | Spring Grove | — | ◇ UNVERIFIED |
| SESound Enhancement Products | Cary | — | ◇ UNVERIFIED |
| VBVaughan & Bushnell Mfg CO | Hebron | — | ◇ UNVERIFIED |
| AAlnico | Woodstock | 20–99 | ◐ LIKELY ACTIVE |
Classic Products Inc, DBA Mastercoil Spring | Mchenry | 20–99 | ◐ LIKELY ACTIVE |
| FMFlex-Weld Manufacturing | Woodstock | 20–99 | ◐ LIKELY ACTIVE |
| ISIdeal Supply, INC | Huntley | — | ◐ LIKELY ACTIVE |
| MRMacLean-Fogg Richmond | Richmond | 1–19 | ◐ LIKELY ACTIVE |
| PTPrecision Thin Metals | Woodstock | 20–99 | ◐ LIKELY ACTIVE |
| SFScot Forge - Spring Grove | Spring Grove | 100–499 | ◐ LIKELY ACTIVE |
Swiss Automation, Inc. - Cary | Cary | 20–99 | ◐ LIKELY ACTIVE |
| ASAdams Steel Service and Supply, Inc | McHenry | — | ◇ UNVERIFIED |
| AWAl's Welding & Fabrication INC. | Cary | — | ◇ UNVERIFIED |
| AIAlum-i-tank, INC. | Harvard | — | ◇ UNVERIFIED |