| CCColumbia City Mill Services | Columbia City | — | ◇ UNVERIFIED |
| CHColumbian Home Products, LLC | Terre Haute | — | ◇ UNVERIFIED |
| CMCore Metals Group LLC (mpm Facility) | Aurora | — | ◇ UNVERIFIED |
| ECEdward C. Levy CO. INC. - Contractor of | East Chicago | — | ◇ UNVERIFIED |
| FMFewell Monument - Production Facility | Scottsburg | — | ◇ UNVERIFIED |
| FIFidler INC | Elkhart | — | ◇ UNVERIFIED |
| GSGeneral Shale Brick Incorporated Plant 67 | Terre Haute | — | ◇ UNVERIFIED |
| GPGeorgia Pacific Gypsum LLC | Wheatfield | — | ◇ UNVERIFIED |
| GAGuardian Automotive Products Incorporated | Auburn | — | ◇ UNVERIFIED |
| HRHarsco - Reed Minerals Division | Gary | — | ◇ UNVERIFIED |
| HHHi Hill Ready Mix Company | Seymour | — | ◇ UNVERIFIED |
| IGIndiana Glass Company, INC. | Dunkirk | — | ◇ UNVERIFIED |
| ILIndiana Limestone Supply Incorporated | Spencer | — | ◇ UNVERIFIED |
| IMIrving Materials INC | Salem | — | ◇ UNVERIFIED |
| IMIrving Materials INC Bloomfield | Bloomfield | — | ◇ UNVERIFIED |
| IMIrving Materials INC Danville | Danville | — | ◇ UNVERIFIED |
| IMIrving Materials Incorporated | Brazil | — | ◇ UNVERIFIED |
| IMIrving Materials INC Remington | Remington | — | ◇ UNVERIFIED |
| JSJones & Sons Bloomfield | Bloomfield | — | ◇ UNVERIFIED |
| KIKeramos INC | Indianapolis | — | ◇ UNVERIFIED |
| LCLippert Components INC. Plant 119 | Bristol | — | ◇ UNVERIFIED |
| MIMenard Incorporated | Terre Haute | — | ◇ UNVERIFIED |
| MMMeyer Material CO Middlebury Ready Mix Plant | Middlebury | — | ◇ UNVERIFIED |
| MMMeyer Material CO Warsaw Ready Mix Plant | Warsaw | — | ◇ UNVERIFIED |
| NANorth American Refractories (narco) | Gary | — | ◇ UNVERIFIED |
| NBNorthfield Block Company | Indianapolis | — | ◇ UNVERIFIED |
| OCOzinga Cement Incorporated Contractor of Cleveland-cliffs Bu | Burns Harbor | — | ◇ UNVERIFIED |
| OROzinga Ready-mix Concrete - Bremen | Bremen | — | ◇ UNVERIFIED |
| OROzinga Ready-mix Concrete - Elkhart E | Elkhart | — | ◇ UNVERIFIED |
| OROzinga Ready-mix Concrete - Gary | Gary | — | ◇ UNVERIFIED |
| OROzinga Ready Mix Concrete INC. - South Bend | South Bend | — | ◇ UNVERIFIED |
| OROzinga Ready-mix Concrete-wheatfield | Wheatfield | — | ◇ UNVERIFIED |
| OROzinga Ready-mix Goshen | Goshen | — | ◇ UNVERIFIED |
| PSPhoenix Services LLC | Chesterton | — | ◇ UNVERIFIED |
| PUPlycem USA Incorporated | Terre Haute | — | ◇ UNVERIFIED |
| PIPpg Industries | Kokomo | — | ◇ UNVERIFIED |
| QIQuikrete - Indianapolis, in Plant | Indianapolis | — | ◇ UNVERIFIED |
| RERetek Engineering Solutions LLC Dba Anc | Elkhart | — | ◇ UNVERIFIED |
| RCRichmond Concrete Richmond Plant Division of Ernst Enterprises | Richmond | — | ◇ UNVERIFIED |
| RARieter Automotive North America | Lowell | — | ◇ UNVERIFIED |
| RGRinker Greenfield Pipe | Greenfield | — | ◇ UNVERIFIED |
| RWRinker Whitestown Pipe | Whitestown | — | ◇ UNVERIFIED |
| SGSchott Gemtron Corporation | Vincennes | — | ◇ UNVERIFIED |
| SHSchott Home Tech North America, INC. | Vincennes | — | ◇ UNVERIFIED |
| SGShelby Gravel Incorporated | Columbus | — | ◇ UNVERIFIED |
| SMShelby Materials | Westfield | — | ◇ UNVERIFIED |
| SMShelby Materials Incorporated | Indianapolis | — | ◇ UNVERIFIED |
| SGSms Group Incorporated | Gary | — | ◇ UNVERIFIED |
| SRSmyrna Ready Mix Concrete LLC Plant #212 | Aurora | — | ◇ UNVERIFIED |
| SMSynergy Management | Monon | — | ◇ UNVERIFIED |
