Formsprag LLC | Warren | 100–499 | ● ACTIVE |
Mb Aerospace Warren LLC | Warren | 100–499 | ● ACTIVE |
| WTWarren Truck Assembly Plant (wtap) | Warren | 500+ | ● ACTIVE |
Futuramic Tool & Engineering CO | Warren | — | ● ACTIVE |
Loc Industries INC | Warren | — | ● ACTIVE |
313 Industries INC | Warren | — | ● ACTIVE |
Canfield Equipment Service, INC. | Warren | — | ● ACTIVE |
Cyclops Defense L.l.c. | Warren | — | ● ACTIVE |
Dragon Transport Group LTD | Warren | — | ● ACTIVE |
| FUFca US LLC Warren Stamping Plant (b2757) | Warren | 500+ | ◐ LIKELY ACTIVE |
| UMU.s. Manufacturing CORP. | Warren | — | ◇ UNVERIFIED |
| OMOpus Mach LLC | Warren | — | ◇ UNVERIFIED |
| BIBae Industries INC | Warren | — | ◐ LIKELY ACTIVE |
| BIBridgewater Interiors | Warren | 500+ | ◐ LIKELY ACTIVE |
| FWFlex-N-Gate Warren Stamping | Warren | 20–99 | ◐ LIKELY ACTIVE |
| GMGeneral Motors LLC | Warren | — | ◐ LIKELY ACTIVE |
| GTGm Technical Center | Warren | — | ◐ LIKELY ACTIVE |
| IAInternational Automotive Components | Warren | 100–499 | ◐ LIKELY ACTIVE |
| MMMagna Modular Systems LLC dba AIM Systems | Warren | 100–499 | ◐ LIKELY ACTIVE |
| UAUS Army Detroit Arsenal and Detroit Tank Plant | Warren | — | ◐ LIKELY ACTIVE |
| GEGround Effects, LLC | Warren | — | ◐ LIKELY ACTIVE |
| AAAz Automotive | Warren | — | ◇ UNVERIFIED |
| DIDana Incorporated | Warren | — | ◇ UNVERIFIED |
| GMGeneral Motors LLC | Warren | — | ◇ UNVERIFIED |
| GPGm Powertrain Warren Transmission | Warren | — | ◇ UNVERIFIED |
| AWAvancez Warren | Warren | 100–499 | ◐ LIKELY ACTIVE |
| DIDana Inc. (Warren Light Axle Manufacturing, LLC) | Warren | 500+ | ◐ LIKELY ACTIVE |
| DMDart Machinery | Warren | 20–99 | ◐ LIKELY ACTIVE |
| DDDEF - Detroit Engineering Office | Warren | 1–19 | ◐ LIKELY ACTIVE |
| FNFlex-N-Gate Nine Mile Road | Warren | 100–499 | ◐ LIKELY ACTIVE |
| FTForming Technologies | Warren | 20–99 | ◐ LIKELY ACTIVE |
| GDGm Defense LLC | Warren | — | ◐ LIKELY ACTIVE |
| GSGroesbeck Stamping | Warren | 100–499 | ◐ LIKELY ACTIVE |
| KAKwangjin America, Inc. | Warren | 100–499 | ◐ LIKELY ACTIVE |
| OWOakley - Warren | Warren | 20–99 | ◐ LIKELY ACTIVE |
| SWSLW Warren LLC | Warren | 100–499 | ◐ LIKELY ACTIVE |
| TPTrend Performance Products | Warren | 20–99 | ◐ LIKELY ACTIVE |
| WTWarren Technical Center | Warren | 500+ | ◐ LIKELY ACTIVE |
| WWelding | Warren | 100–499 | ◐ LIKELY ACTIVE |
| DPDesign Photographic Studio | Warren | — | ◇ UNVERIFIED |
| FTFuturamic Tool | Warren | — | ◇ UNVERIFIED |
| GMGeneral Motors LLC | Warren | — | ◇ UNVERIFIED |
| GTGm Technical Service Ctr Main Mfg | Warren | — | ◇ UNVERIFIED |
| GWGm Warren Tech Ctr | Warren | — | ◇ UNVERIFIED |
| IIIroquois Industries INC | Warren | — | ◇ UNVERIFIED |
| IIIroquois Industries INC | Warren | — | ◇ UNVERIFIED |
| IIIroquois Industries INC Plt 1 | Warren | — | ◇ UNVERIFIED |
| RIRadar Industries INC Warren Plt 12 | Warren | — | ◇ UNVERIFIED |
| SIShiloh Industries | Warren | — | ◇ UNVERIFIED |
| SASmw Automotive | Warren | — | ◇ UNVERIFIED |