| IMIndustrial Metal Processing, INC | Santee | — | ◐ LIKELY ACTIVE |
| LTL & T Precision, LLC | Poway | — | ◐ LIKELY ACTIVE |
| MRMarine & Restaurant Fabricators, INC. | San Diego | — | ◐ LIKELY ACTIVE |
| MMMiramar Metal Processing of San Diego, INC. | San Diego | — | ◐ LIKELY ACTIVE |
| PMProvisio Medical INC | San Diego | — | ◐ LIKELY ACTIVE |
| RMRieker Machine LLC | Carlsbad | — | ◐ LIKELY ACTIVE |
| SDSan Diego | San Diego | 1–19 | ◐ LIKELY ACTIVE |
| SISteico Industries, INC. | Oceanside | — | ◐ LIKELY ACTIVE |
| TBTriangle Brass Mfg Co, INC. Dba Trimco | Oceanside | — | ◐ LIKELY ACTIVE |
| VEVortex Engineering, LLC | Santee | — | ◐ LIKELY ACTIVE |
| WSWeiland Sliding Doors | Oceanside | 20–99 | ◐ LIKELY ACTIVE |
| WMWestech Metal Fabrication, INC | San Diego | — | ◐ LIKELY ACTIVE |
| ZAZenix Aerospace K LLC | El Cajon | — | ◐ LIKELY ACTIVE |
| AHAemi Holdings, Llc, Dba Aem, INC | San Diego | — | ◐ LIKELY ACTIVE |
| AMAnocote Metal Finishing, INC. | San Diego | — | ◐ LIKELY ACTIVE |
| CMCarroll Metal Works INC | National City | — | ◐ LIKELY ACTIVE |
| CMCreative Metal Industries INC | Santee | — | ◐ LIKELY ACTIVE |
| EMElite Metal Finishing | Oceanside | — | ◐ LIKELY ACTIVE |
| EEEscondido Energy Center | Escondido | — | ◐ LIKELY ACTIVE |
| MBMinshew Brothers Steel Construction INC | Lakeside | — | ◐ LIKELY ACTIVE |
| PMPremier Metal Processing INC | El Cajon | — | ◐ LIKELY ACTIVE |
| SISurfacemode, INC | San Diego | — | ◐ LIKELY ACTIVE |
| AAA and D Plating INC | Escondido | — | ◇ UNVERIFIED |
| AFAlden Farris | San Diego | — | ◇ UNVERIFIED |
| APAllied Piping & Welding INC | National City | — | ◇ UNVERIFIED |
 American Tool & Engineering | San Diego | — | ◇ UNVERIFIED |
| ATA to Z Metal Finishing | San Diego | — | ◇ UNVERIFIED |
| BKBuck Knives INC | El Cajon | — | ◇ UNVERIFIED |
| CBCarlson & Beauloye Machine Shop INC | San Diego | — | ◇ UNVERIFIED |
| CMCertified Metal Craft | El Cajon | — | ◇ UNVERIFIED |
| CVChula Vista Energy Center | Chula Vista | — | ◇ UNVERIFIED |
| GGlockstore | San Diego | — | ◇ UNVERIFIED |
| HSHomestead Sheet Metal | Spring Valley | — | ◇ UNVERIFIED |
| IAInfinite Ascent LLC | San Marcos | — | ◇ UNVERIFIED |
| JCJordan & CO LLC | Carlsbad | — | ◇ UNVERIFIED |
| MPMaster Plating | San Diego | — | ◇ UNVERIFIED |
| MMMathy Machine INC | Santee | — | ◇ UNVERIFIED |
| MFMossy Ford | San Diego | — | ◇ UNVERIFIED |
| PTPeacock Tool & Engineering | Spring Valley | — | ◇ UNVERIFIED |
| RSRichardson Steel INC | Spring Valley | — | ◇ UNVERIFIED |
| RARivian Automotive (vista) | Vista | — | ◇ UNVERIFIED |
| RSRossin Steel INC | San Diego | — | ◇ UNVERIFIED |
| SPSanchez Polishing and Plating | Escondido | — | ◇ UNVERIFIED |
| SCSouthern California Plating CO INC | San Diego | — | ◇ UNVERIFIED |
| SPSpecialized Processing CO INC | El Cajon | — | ◇ UNVERIFIED |
| SASpray Art Finishers | Escondido | — | ◇ UNVERIFIED |
| SSStruc Steel INC | Spring Valley | — | ◇ UNVERIFIED |
| SMSymcoat Metal Processing | San Diego | — | ◇ UNVERIFIED |
| TBTop Brass & Metal Refinishing | Spring Valley | — | ◇ UNVERIFIED |
| TFTriumph Fabrications - San Diego | El Cajon | — | ◇ UNVERIFIED |
