| GIGuardian Industries - Dewitt | De Witt | 100–499 | ● ACTIVE |
Petersen Mfg. CO. | Denison | — | ● ACTIVE |
| UGUS Gypsum - Sperry Plant | Mediapolis | 100–499 | ● ACTIVE |
| LTLloyd Table Company | Lisbon | — | ● ACTIVE |
Dumani Stone LLC | Evansdale | — | ● ACTIVE |
Glass Fabricators INC | Grimes | — | ● ACTIVE |
Hahn Ready-mix CO | Davenport | — | ● ACTIVE |
Indianola Precast, L.l.c | Indianola | — | ● ACTIVE |
Pdm Precast INC | Des Moines | — | ● ACTIVE |
| 3M3m (minnesota Mining & Mfg Co) - Ames | Ames | — | ◐ LIKELY ACTIVE |
| BRBenton's Ready Mixed Concrete INC | Cedar Falls | 20–99 | ◐ LIKELY ACTIVE |
| BCBertch Cabinet, LLC. - Waterloo | Waterloo | — | ◐ LIKELY ACTIVE |
| BSBovard Studio INC | Fairfield | 20–99 | ◐ LIKELY ACTIVE |
| CRCti Ready Mix | Grimes | 100–499 | ◐ LIKELY ACTIVE |
| CPCustom Precast CO | Cascade | 20–99 | ◐ LIKELY ACTIVE |
| ECEdwards Cast Stone Company | Dubuque | 20–99 | ◐ LIKELY ACTIVE |
| ICIowa City Ready Mix INC | Iowa City | 20–99 | ◐ LIKELY ACTIVE |
| MRMetro Ready Mix, Lc | Iowa City | 1–19 | ◐ LIKELY ACTIVE |
| AIAmsco INC - Linwood Mining Lime Plant | Davenport | — | ◐ LIKELY ACTIVE |
| CICentral Iowa Ready Mix | West Des Moines | — | ◐ LIKELY ACTIVE |
| NHNew Hampton Metal Fab | New Hampton | — | ◐ LIKELY ACTIVE |
| NNorthfield-rhino | West Des Moines | — | ◐ LIKELY ACTIVE |
| SCSioux City Brick & Tile CO United Brick & Tile a Div | Adel | — | ◐ LIKELY ACTIVE |
| ACAmerican Concrete Products | Creston | — | ◇ UNVERIFIED |
| ACAmerican Concrete Products | Des Moines | — | ◇ UNVERIFIED |
| ACAmerican Concrete Products INC | Atlantic | — | ◇ UNVERIFIED |
| ACAmerican Concrete Products INC | Clarinda | — | ◇ UNVERIFIED |
| ACAmerican Concrete Products INC | Perry | — | ◇ UNVERIFIED |
| ACAmerican Concrete Products INC | Winterset | — | ◇ UNVERIFIED |
| ACAmerican Concrete Products INC | Denison | — | ◇ UNVERIFIED |
| BSBellevue Sand & Gravel | Bellevue | — | ◇ UNVERIFIED |
| CCCemstone Concrete Materials-fort Dodge South | Fort Dodge | — | ◇ UNVERIFIED |
| CICentral Iowa Ready Mix | Audubon (historical) | — | ◇ UNVERIFIED |
| CICentral Iowa Ready Mix INC | Grimes | — | ◇ UNVERIFIED |
| FPForterra Pipe & Precast | Marshalltown | — | ◇ UNVERIFIED |
| GAGcc Alliance Concrete Incorporated | Sioux Center | — | ◇ UNVERIFIED |
| GOGcc - Orange City | Orange City | — | ◇ UNVERIFIED |
| GBGcc-sergeant Bluff | Sergeant Bluff | — | ◇ UNVERIFIED |
| GGGeorgia-pacific Gypsum LLC - Fort Dodge | Fort Dodge | — | ◇ UNVERIFIED |
| GAGreen America Recycling | Buffalo | — | ◇ UNVERIFIED |
| LCLehigh Cement CO - Mason City Facility | Mason City | — | ◇ UNVERIFIED |
| LRLiberty Ready Mix | Des Moines | — | ◇ UNVERIFIED |
| MPMidwest Precast Concrete Enterprises INC | Mount Pleasant | — | ◇ UNVERIFIED |
| PIPotters Industries INC | Muscatine | — | ◇ UNVERIFIED |
| RMReady Mixed Concrete Company - Council Bluffs | Council Bluffs | — | ◇ UNVERIFIED |
| SCSioux City Brick & Tile Company | Sergeant Bluff | — | ◇ UNVERIFIED |
| SRStandard Ready Mix Concrete | Sioux City | — | ◇ UNVERIFIED |
| CPCalcium Products Inc-gilmore City | Gilmore City | — | ◐ LIKELY ACTIVE |
| CICentral Iowa Ready Mix | Des Moines | 20–99 | ◐ LIKELY ACTIVE |
| CICentral Iowa Ready Mix-Ames | Ames | 1–19 | ◐ LIKELY ACTIVE |