 Modern Forge Indiana LLC | Merrillville | 100–499 | ● ACTIVE |
 American Stair Corporation, INC. | Hammond | 100–499 | ● ACTIVE |
 Quintel INC | Schererville | — | ● ACTIVE |
 The Progress Group, INC. | Schererville | — | ● ACTIVE |
 Motion & Control Enterprises, LLC | Hammond | — | ● ACTIVE |
 Refax INC | Gary | — | ● ACTIVE |
| MSMunster Steel Company Incorporated | Hammond | — | ◇ UNVERIFIED |
| CLChemcoaters LLC | Gary | 20–99 | ◐ LIKELY ACTIVE |
| WIWare Industries, INC. D/b/a Marino/ware | East Chicago | 100–499 | ◐ LIKELY ACTIVE |
| SCSilgan Containers Manufacturing Corpora | Hammond | — | ◐ LIKELY ACTIVE |
| WCWynright Corporationnp | Hobart | — | ◇ UNVERIFIED |
| NMNational Material Processing | East Chicago | — | ◐ LIKELY ACTIVE |
| BWBp Warehouse | Hammond | — | ◇ UNVERIFIED |
| CCC & C Iron Incorporated | Merrillville | — | ◇ UNVERIFIED |
| GOGeorge Odays Shop Incorporated | Hammond | — | ◇ UNVERIFIED |
| HLHadady LLC | Dyer | — | ◇ UNVERIFIED |
| HMHammond Machine | Hammond | — | ◇ UNVERIFIED |
| LSLasalle Steel CO. - Fluid Power Operations | Griffith | — | ◇ UNVERIFIED |
| MSMidwestern Steel Fabricators Chicago LLC | Hammond | — | ◇ UNVERIFIED |
| MPMidwest Pipe Coating | Schererville | — | ◇ UNVERIFIED |
| MSMunster Steel Company | Munster | — | ◇ UNVERIFIED |
| TWTechnical Weighing Services INC | Griffith | — | ◇ UNVERIFIED |
| TMTrident Machine Technologies, INC. | Hammond | — | ◇ UNVERIFIED |
| UTUnion Tank Car Company | East Chicago | — | ◇ UNVERIFIED |
| VMVermette Machine Company, INC. | Hammond | — | ◇ UNVERIFIED |
| WCWheeling Corrugating CO | Gary | — | ◇ UNVERIFIED |
| AMAbbott Machine company - Highland Indiana | Highland | 1–19 | ◐ LIKELY ACTIVE |
| ARAmsted Rail - Hammond, IN | Hammond | 20–99 | ◐ LIKELY ACTIVE |
| FMFe Moran INC Industrial | Hammond | — | ◐ LIKELY ACTIVE |
| MLMazzella Lifting Technologies (East Chicago, IN) | East Chicago | 1–19 | ◐ LIKELY ACTIVE |
| Mmunster1501 | Hammond | 20–99 | ◐ LIKELY ACTIVE |
| PGPaul's Gary | Gary | 1–19 | ◐ LIKELY ACTIVE |
| PLPaul's Lake Station | Lake Station | 1–19 | ◐ LIKELY ACTIVE |
| PMPaul's Merrillville | Merrillville | 1–19 | ◐ LIKELY ACTIVE |
| RCREM Chemicals RU3 IN | Merrillville | 1–19 | ◐ LIKELY ACTIVE |
| TITri-State Industries, Inc. - Indiana | Hammond | 20–99 | ◐ LIKELY ACTIVE |
| BTBlackwell Technologies LLC | East Chicago | — | ◇ UNVERIFIED |
| AMAce Machine & Industrial LLC | Crown Point | — | ◇ UNVERIFIED |
| AMAlchemy Machining LLC | Crown Point | — | ◇ UNVERIFIED |
| CPCentennial Processing LLC | Gary | — | ◇ UNVERIFIED |
| CMCrawley Machine Co LLC | Crown Point | — | ◇ UNVERIFIED |
| DMDecorative Metal Works, LLC | East Chicago | — | ◇ UNVERIFIED |
| EPEtan Property Management, LLC | Griffith | — | ◇ UNVERIFIED |
| GIGrabek Iron Works, Inc. | Crown Point | — | ◇ UNVERIFIED |
| HIH-a Industries-div of A.m. Castle & CO | Hammond | — | ◇ UNVERIFIED |
| HMHerald Machine Works INC | East Chicago | — | ◇ UNVERIFIED |
| HMHerald Machine Works, INC. | Gary | — | ◇ UNVERIFIED |
| ISIndustrial Steel Construction Incorporated | Gary | — | ◇ UNVERIFIED |
 Kocsis Brothers Machine Company | East Chicago | — | ◇ UNVERIFIED |
| MAMerrillville Awnings LLC | Merrillville | — | ◇ UNVERIFIED |
