| NNNew Ngc INC. D/b/a National Gypsum Compa | Clinton | — | ◐ LIKELY ACTIVE |
| NRNipsco Rm Schahfer Peaker Plant | Wheatfield | — | ◐ LIKELY ACTIVE |
| NNorthfield-indianapolis | Indianapolis | — | ◐ LIKELY ACTIVE |
| OBOzinga Brothers Ready Mix Concrete | Crown Point | — | ◐ LIKELY ACTIVE |
| PSPhoenix Services LLC Dba Metal Services | East Chicago | — | ◐ LIKELY ACTIVE |
| PFProform Finishing Products, LLC | Rensselaer | — | ◐ LIKELY ACTIVE |
| UIUni-ref Incorporated | Brookville | — | ◐ LIKELY ACTIVE |
| TMThermafiber Manufacturing Plant | Wabash | — | ◇ UNVERIFIED |
| ECElite Crete Systems Incorporated | Valparaiso | 20–99 | ◐ LIKELY ACTIVE |
| MSMajestic Stone Imports | Indianapolis | 20–99 | ◐ LIKELY ACTIVE |
Maxi-blast INC | South Bend | — | ◐ LIKELY ACTIVE |
| CDContinental Diamond Tool Corporation | New Haven | 100–499 | ◐ LIKELY ACTIVE |
| DCDubois County Block & Brick Incorporated | Jasper | 20–99 | ◐ LIKELY ACTIVE |
| ILIsoa LLC Dba Insulation Specialties of America | Wanatah | 20–99 | ◐ LIKELY ACTIVE |
| OEOmega Enterprises, INC. | Winchester | 20–99 | ◐ LIKELY ACTIVE |
| RRRubicon Refractories Inc | Hammond | 1–19 | ◐ LIKELY ACTIVE |
| SLServaas Laboratories Incorporated | Indianapolis | 100–499 | ◐ LIKELY ACTIVE |
| COCoast Oem LLC | Kokomo | 1–19 | ◇ UNVERIFIED |
| 1A104532 - Aia Countertops | Syracuse | 100–499 | ◐ LIKELY ACTIVE |
| 1A106552 - Ardagh Glass Winchester | Winchester | 100–499 | ◐ LIKELY ACTIVE |
| ARAdvance Ready Mix Concrete, Inc Plant 6 | Jeffersonville | 1–19 | ◐ LIKELY ACTIVE |
| AIATMI Indy, LLC | Greenfield | 100–499 | ◐ LIKELY ACTIVE |
| BLBedford Limestone Suppliers Group | Bedford | 20–99 | ◐ LIKELY ACTIVE |
| BSBeemsterboer Slag CORP Contractor of Ar | East Chicago | — | ◐ LIKELY ACTIVE |
| CGCarlex Glass America LLC | Ligonier | — | ◐ LIKELY ACTIVE |
| ECElkhart (KIK Custom Products) | Elkhart | 1–19 | ◐ LIKELY ACTIVE |
| HMHeidelberg Materials US Cement LLC | Sellersburg | — | ◐ LIKELY ACTIVE |
| HSHog Slat INC | Universal | — | ◐ LIKELY ACTIVE |
| ILIndiana Limestone Acquisition LLC Dba Indiana Limestone CO INC Central | Bloomington | — | ◐ LIKELY ACTIVE |
| ILIndiana Limestone Company - Empire Mill | Oolitic | 20–99 | ◐ LIKELY ACTIVE |
| JSJ Shaw Industries LLC Dba Kokomo Opalescent Glass Company | Kokomo | — | ◐ LIKELY ACTIVE |
| MCModified Concrete Suppliers, LLC | Indianapolis | 20–99 | ◐ LIKELY ACTIVE |
| NNoblesville | Noblesville | 20–99 | ◐ LIKELY ACTIVE |
| RMRinker Materials Concrete Pipe Division | Whitestown | — | ◐ LIKELY ACTIVE |
| RGRogers Group Newton County Stone | Kentland | — | ◐ LIKELY ACTIVE |
| SGStafford Gravel Incorporated | Butler | — | ◐ LIKELY ACTIVE |
| TCTexaCon Cut Stone | Bloomington | 20–99 | ◐ LIKELY ACTIVE |
| TETri Eagle LLC | Kingsford Heights | — | ◐ LIKELY ACTIVE |
| TGTrulite Glass and Aluminum Solutions | Indianapolis | 20–99 | ◐ LIKELY ACTIVE |
| UGUS Gypsum Shoals | Shoals | 100–499 | ◐ LIKELY ACTIVE |
| 1A106960 - Ardagh Glass INC | Dunkirk | — | ◐ LIKELY ACTIVE |
| APAbrasive Processing & Technologies, LLC. | Fortville | — | ◐ LIKELY ACTIVE |
| AMAllen Monument Company, INC | Crawfordsville | 1–19 | ◐ LIKELY ACTIVE |
| BMButler Mill Service Company | Butler | — | ◐ LIKELY ACTIVE |
| CICardinal Ig | Fremont | — | ◐ LIKELY ACTIVE |
| CCColumbia City Mill Services | Columbia City | — | ◐ LIKELY ACTIVE |
| FIFidler INC | Elkhart | — | ◐ LIKELY ACTIVE |
| GSGeneral Shale Brick INC | Mooresville | — | ◐ LIKELY ACTIVE |
| IPImi Plant 101 | Greenfield | — | ◐ LIKELY ACTIVE |
| ILIndiana Limestone Company Incorporated - Empire Quarry | Oolitic | — | ◐ LIKELY ACTIVE |