| MSMaya Steel Fabrications INC | Gardena | — | ◇ UNVERIFIED |
| MFMet-a-lum Fabricators | Paramount | — | ◇ UNVERIFIED |
| MLMht Luxury Alloys192 | Compton | — | ◇ UNVERIFIED |
| MCMichels & CO Furniture Mfg | Lynwood | — | ◇ UNVERIFIED |
| MPModern Pattern & Foundry CO. INC. (mp) | Vernon | — | ◇ UNVERIFIED |
| MAMonarch Aluminum Casting CO | South Gate | — | ◇ UNVERIFIED |
| MWMws Wire Industries | Westlake Village | — | ◇ UNVERIFIED |
| OCOld Country Millwork INC | Los Angeles | — | ◇ UNVERIFIED |
| PCPacific Cast Products | Santa Fe Springs | — | ◇ UNVERIFIED |
| PDPacific Die Casting | Commerce | — | ◇ UNVERIFIED |
| PTPacific Tube CO | Los Angeles | — | ◇ UNVERIFIED |
| PMParamount Metals & Supply CO | Paramount | — | ◇ UNVERIFIED |
| PCPechiney Cast Plate INC | Vernon | — | ◇ UNVERIFIED |
| PDPioneer Diecaster INC | Los Angeles | — | ◇ UNVERIFIED |
| PPPrecision Powdered Metal Parts | Pomona | — | ◇ UNVERIFIED |
| PSPrecision Specialty Metals INC | Los Angeles | — | ◇ UNVERIFIED |
| SGSan Gabriel Valley Area 2 | Baldwin Park | — | ◇ UNVERIFIED |
| SESemco Enterprises INC | City of Industry | — | ◇ UNVERIFIED |
| SDStar Die Casting & Manufacturing, INC | Santa Fe Springs | — | ◇ UNVERIFIED |
| TPTci Precision Metals | Gardena | — | ◇ UNVERIFIED |
| TATechnical Anodize LLC | Pomona | — | ◇ UNVERIFIED |
| TCTeledyne Cast Parts Pomona Operations | Walnut | — | ◇ UNVERIFIED |
| TITeledyne Instruments - Analytical Instruments | City of Industry | — | ◇ UNVERIFIED |
| TITitech International (wohl Property) | Walnut | — | ◇ UNVERIFIED |
| VBValley Brass Incorporated | El Monte | — | ◇ UNVERIFIED |
| WTWestern Tube & Conduit CORP | Long Beach | — | ◇ UNVERIFIED |
| CPCast Parts, Inc - Consolidated Precision Products | City of Industry | 100–499 | ◐ LIKELY ACTIVE |
| HCHydro COI | City of Industry | 100–499 | ◐ LIKELY ACTIVE |
| KAKaiser Aluminum | Commerce | 100–499 | ◐ LIKELY ACTIVE |
| MUMPG US Irwindale | Irwindale | 100–499 | ◐ LIKELY ACTIVE |
| NCNetwill Company, INC | South El Monte | — | ▲ REPORTED CLOSED |
| QQQuality Quimbaya CORP. | Baldwin Park | — | ◐ LIKELY ACTIVE |
| VMVulcan Metals Parent, LLC | Los Angeles | — | ◐ LIKELY ACTIVE |
| WIWireTech Inc. | Commerce | 20–99 | ◐ LIKELY ACTIVE |
| LALos Angeles Pump & Valve | Huntington Park | — | ◇ UNVERIFIED |
| LALos Angeles Pump & Valve Products | Huntington Park | — | ◇ UNVERIFIED |
| PAPacific Alloy Castings INC | South Gate | — | ◇ UNVERIFIED |
| PFPrecision Forging Dies, INC. | South Gate | — | ◇ UNVERIFIED |
| WFWestern Fabrication Tech CORP | Valencia | — | ◇ UNVERIFIED |
| ACAcme Castings INC | Huntington Park | — | ◇ UNVERIFIED |
| ACAcme Castings INC | Huntington Park | — | ◇ UNVERIFIED |
| AGAden Guan Incorporated | South El Monte | — | ◇ UNVERIFIED |
| AGAdj Group, LLC | Vernon | — | ◇ UNVERIFIED |
| ANAir Nail Company | South Gate | — | ◇ UNVERIFIED |
| AFAlcast Foundry INC | Redondo Beach | — | ◇ UNVERIFIED |
| AFAlegacy Food Services Group INC | Santa Fe Springs | — | ◇ UNVERIFIED |
| AFAlhambra Foundry CO LTD | Alhambra | — | ◇ UNVERIFIED |
| ASAllied Signal Aerospace CO | Torrance | — | ◇ UNVERIFIED |
| AFAlphacast Foundry INC | Azusa | — | ◇ UNVERIFIED |
| AFAlphacast Foundry INC | Azusa | — | ◇ UNVERIFIED |
