| CICaplugs INC | Rancho Dominguez | — | ◇ UNVERIFIED |
| CIChem-tainer Industries INC | Compton | — | ◇ UNVERIFIED |
 Composites Horizons INC | Covina | — | ◇ UNVERIFIED |
| DIDucommun INC | Santa Clarita | — | ◇ UNVERIFIED |
| EIElectroply INC | El Segundo | — | ◇ UNVERIFIED |
| FFFalcon Foam a Div of Atlas Roofing | Los Angeles | — | ◇ UNVERIFIED |
| FFFoam Fabricators | Compton | — | ◇ UNVERIFIED |
| FIFp International - Commerce, Ca | Commerce | — | ◇ UNVERIFIED |
| GSGruber Sys INC | Valencia | — | ◇ UNVERIFIED |
| HPHayward Pool Products INC | Pomona | — | ◇ UNVERIFIED |
| IPIpp Plastic Products INC | Duarte | — | ◇ UNVERIFIED |
| KMKirkhill Manufacturing CO | Downey | — | ◇ UNVERIFIED |
| LTLakin Tire West LLC | Santa Fe Springs | — | ◇ UNVERIFIED |
| LMLeonard's Molded Products | Santa Clarita | — | ◇ UNVERIFIED |
| MPMato Plastics INC. | Valencia | — | ◇ UNVERIFIED |
| MPMercury Plastics, INC. | City of Industry | — | ◇ UNVERIFIED |
| MCMolding Corporation of America | Pacoima | 20–99 | ◇ UNVERIFIED |
| NONational O-ring (dba Hutchinson Seal Corp) | Downey | — | ◇ UNVERIFIED |
| OPOmega Packaging Dba Comar | La Mirada | — | ◇ UNVERIFIED |
| OEOnex Enterprises CORP | Duarte | 1–19 | ◇ UNVERIFIED |
| PCPactiv Corporation - La Mirada | La Mirada | — | ◇ UNVERIFIED |
| PIPark International Corporation | Long Beach | — | ▲ REPORTED CLOSED |
| PBP. B. Fiberglass Products INC | Sun Valley | — | ◇ UNVERIFIED |
| PDPlastic Dress Up CO | South El Monte | — | ◇ UNVERIFIED |
 Polytek Development CORP | Pomona | — | ◇ UNVERIFIED |
| PMPrime Measurement Products LLC | City of Industry | — | ◇ UNVERIFIED |
| RORamcast Ornamental Supply CO INC | Van Nuys | — | ◇ UNVERIFIED |
| RCRegal Cultured Marble INC | Pomona | — | ◇ UNVERIFIED |
| RPRehrig Pacific CO | Los Angeles | — | ◇ UNVERIFIED |
| SPSandee Plastic Extrusions | Paramount | — | ◇ UNVERIFIED |
| SISdi Industries | Pacoima | — | ◇ UNVERIFIED |
| SCSewing Collection INC | Vernon | — | ◇ UNVERIFIED |
| SFSignature Flexible Packaging, INC | Commerce | — | ◇ UNVERIFIED |
| SMSouthwest Machine & Plastic CO | Glendora | — | ◇ UNVERIFIED |
| SIStoropack INC | Downey | — | ◇ UNVERIFIED |
| SFSunshine Fpc INC | Montebello | — | ◇ UNVERIFIED |
| THTank Holding CORP | Gardena | — | ▲ REPORTED CLOSED |
| TDThree D Plastics INC | Burbank | — | ◇ UNVERIFIED |
| TSTrelleborg Sealing Solutions El Segundo INC | El Segundo | — | ◇ UNVERIFIED |
| UIUpm INC | Baldwin Park | — | ◇ UNVERIFIED |
 Alpha Industries INC 1542 | Los Angeles | 20–99 | ◐ LIKELY ACTIVE |
 Altium Packaging - Irwindale | Irwindale | 1–19 | ◐ LIKELY ACTIVE |
| Altium Packaging - Samuelson | Industry | 100–499 | ◐ LIKELY ACTIVE |
| AUApex Universal, INC | Santa Fe Springs | — | ◐ LIKELY ACTIVE |
| CPC&G Plastics, Inc. | Sylmar | 20–99 | ◐ LIKELY ACTIVE |
| CKConroy & Knowlton, INC | Montebello | — | ◐ LIKELY ACTIVE |
| DCDazpak City of Industry | City of Industry | 20–99 | ◐ LIKELY ACTIVE |
| DGDazpak Gardena | Gardena | 20–99 | ◐ LIKELY ACTIVE |
| DPDirect Pack Inc. Azusa | Azusa | 20–99 | ◐ LIKELY ACTIVE |
| FAFood and Beverage Business Unit SANTA FE SPRINGS | Santa Fe Springs | 100–499 | ◐ LIKELY ACTIVE |
