| MFMolded Fiber Glass Composite Systems Company | Ashtabula | 100–499 | ● ACTIVE |
| PCPremix-hadlock Composites LLC | Geneva | 20–99 | ● ACTIVE |
| ZCZehrco-giancola Composites INC | Ashtabula | 20–99 | ● ACTIVE |
 Iten Defense LLC | Ashtabula | — | ● ACTIVE |
| IIIten Industries, INC. - Plant 1 (0204010112) | Ashtabula | 20–99 | ◐ LIKELY ACTIVE |
| GRGrand River Rubber & Plastics Company | Ashtabula | 100–499 | ◐ LIKELY ACTIVE |
| IIIten Industries , Plant 2 | Ashtabula | 20–99 | ◐ LIKELY ACTIVE |
| MFMolded Fiber Glass Research Company * | Ashtabula | 20–99 | ◐ LIKELY ACTIVE |
| GTGmr Technology INC (0204010490) | Ashtabula | — | ◇ UNVERIFIED |
| ZGZehrco Giancola Composites INC Plant 4 | Ashtabula | — | ◇ UNVERIFIED |
| ARAshtabula Rubber CO INC | Ashtabula | — | ◐ LIKELY ACTIVE |
| IIIten Industries INC Plant 4 | Ashtabula | 20–99 | ◐ LIKELY ACTIVE |
| GCGlastic CORP | Jefferson | — | ◇ UNVERIFIED |
| HPHadlock Plastics CORP. Plant 3 | Geneva | — | ◇ UNVERIFIED |
| IIIten Industries | Ashtabula | — | ◇ UNVERIFIED |
| IIIten Industries INC. (plant 3) (0204010442) | Ashtabula | — | ◇ UNVERIFIED |
| IIIten Industries, Inc., Plant 4 (0204010405) | Ashtabula | — | ◇ UNVERIFIED |
| MFMolded Fiber Glass Companies, Plant 1 | Ashtabula | — | ◇ UNVERIFIED |
| SOSigma Ohio Industries Plant 3 | Jefferson | — | ◇ UNVERIFIED |
| ZGZehrco Giancola Composites INC | Ashtabula | — | ◇ UNVERIFIED |
| CMCreative Millwork of Ohio, Inc. | Ashtabula | 20–99 | ◐ LIKELY ACTIVE |
| HGHoneywell - Geneva | Geneva | 100–499 | ◐ LIKELY ACTIVE |
| HPHub Plastics | Geneva | 20–99 | ◐ LIKELY ACTIVE |
| MAMeese - Ashtabula | Ashtabula | 20–99 | ◐ LIKELY ACTIVE |
| MLMv2 LLC | Ashtabula | — | ◐ LIKELY ACTIVE |
| PCPremix-Hadlock Composites - North Kingsville | Conneaut | 100–499 | ◐ LIKELY ACTIVE |
| TATransparent Armor Solutions LLC | Ashtabula | — | ◐ LIKELY ACTIVE |
| ACAllpass Corporation | Ashtabula | — | ◇ UNVERIFIED |
| ASA Schulman INC Dba Premix INC | Conneaut | — | ◇ UNVERIFIED |
| CICorespan INC | Geneva | — | ◇ UNVERIFIED |
| IIIten Industries, INC. | Ashtabula | — | ◇ UNVERIFIED |
| TITeijin Incorporated | Conneaut | — | ◇ UNVERIFIED |
| WIWek Industries | Jefferson | — | ◇ UNVERIFIED |
