| JAJohnson Aluminum Foundry | Cerritos | CA | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| JMJohnson Matthey INC | San Jose | CA | Primary Metal Manufacturing331491 | — | ◇ UNVERIFIED |
| JIJohnston International Corporation Dba Plasties | Tustin | CA | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| JEJV Explore | Fullerton | CA | Primary Metal Manufacturing331512 | — | ◇ UNVERIFIED |
| KSKairos Supply INC | Gardena | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| KAKaiser Aluminum & Chemical CORP | Pleasanton | CA | Primary Metal Manufacturing331312 | — | ◇ UNVERIFIED |
 Kaiser Aluminum Fabricated Products, LLC | Los Angeles | CA | Primary Metal Manufacturing331318 | — | ◇ UNVERIFIED |
| KCKaiser Commerce Center | Fontana | CA | Primary Metal Manufacturing331111 | — | ◇ UNVERIFIED |
| KBKauth Bros INC | Santa Rosa | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| KSKB Steel & Building Products | Anaheim | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| KSKdr Steel | Rialto | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| KPKearney Pattern Works and Foundry, INC | San Jose | CA | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| KMKearneys' Metals, Inc., Dba Kmi Dba Kearneys' Dba | Fresno | CA | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| KAKeys Aluminum | La Mirada | CA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| KSKgel Steel, INC | Riverside | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| KMKhemia Metals INC. | Oakland | CA | Primary Metal Manufacturing331491 | — | ◇ UNVERIFIED |
| KLKim Lighting | Ontario | CA | Primary Metal Manufacturing331521 | — | ◇ UNVERIFIED |
| KRKims Roll Up INC | Los Angeles | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| KMKloeckner Metals | Santa Fe Springs | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| KMKloeckner Metals CORP. | City of Industry | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| KMKloeckner Metals Corporation | Fontana | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| KMKloeckner Metals, INC | Tulare | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| KPK P Iron Foundry INC | Fresno | CA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| KIKuprion, INC. | Fremont | CA | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| KCKwik Cutting & Grinding | Compton | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| LBLa Bash Metals | Newbury Park | CA | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| LDLansco Die Casting INC | City of Industry | CA | Primary Metal Manufacturing331521 | — | ◇ UNVERIFIED |
| LILarco Industries INC | San Jose | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| LSLarson Steel INC | Gilroy | CA | Primary Metal Manufacturing331111 | — | ◇ UNVERIFIED |
| LHLawson Hughes CO INC | South El Monte | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| LMLb Madole CO INC | Chino | CA | Primary Metal Manufacturing331111 | — | ◇ UNVERIFIED |
| LMLeybold Materials INC | Morgan Hill | CA | Primary Metal Manufacturing331528 | — | ◇ UNVERIFIED |
| LCLGV Coupling, Inc. | Shafter | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| LPLined Pipe Systems LLC | Rancho Cucamonga | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| LCLiska Constructors Dba Aeroforming | Paramount | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| LBListon Brick Company of Corona | Corona | CA | Primary Metal Manufacturing331318 | — | ◇ UNVERIFIED |
| LILixivia INC | Santa Barbara | CA | Primary Metal Manufacturing331313 | — | ◇ UNVERIFIED |
| LILixivia INC | Santa Barbara | CA | Primary Metal Manufacturing331313 | — | ◇ UNVERIFIED |
| LMLoc Mfg INC | San Jose | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| LMLortz Manufacturing Company | Laguna Beach | CA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| LALos Angeles Pump and Valve Products | Huntington Park | CA | Primary Metal Manufacturing331523 | — | ◇ UNVERIFIED |
| LALos Angeles Pump and Valve Products | Huntington Park | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| LALos Angeles Pump and Valve Products, Inc. | Huntington Park | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| LTL to Z Ent INC | Banning | CA | Primary Metal Manufacturing331529 | — | ◇ UNVERIFIED |
| LWLucky Welding & Iron, Sung Chang, Dba | Los Angeles | CA | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| LULuxfer USA LTD | Riverside | CA | Primary Metal Manufacturing331316 | — | ◇ UNVERIFIED |
| LPLynwood Pattern | Ontario | CA | Primary Metal Manufacturing331523 | — | ◇ UNVERIFIED |
| MFMacaulay Foundry INC | Berkeley | CA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
 Machineworks Manufacturing | Chatsworth | CA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| MGMaggi Gutierrez | Compton | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
