| AArnco | South Gate | CA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| AMArnold's Metal Finishing | Santa Clara | CA | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| ASAro Service | Anaheim | CA | Transportation Equipment Manufacturing336411 | — | ◇ UNVERIFIED |
| ARA & R Powder Coating INC. | Anaheim | CA | Miscellaneous Manufacturing339910 | — | ◇ UNVERIFIED |
| ACArris Composites INC | Berkeley | CA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| ABArrowhead Brass Products | Los Angeles | CA | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| ACArthrex California INC | Walnut | CA | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| AGArtisans G. H. Fixtures | Tracy | CA | Wood Product Manufacturing321918 | 20-99 | ◇ UNVERIFIED |
| AMArtistica Metal Designs INC | Oxnard | CA | Furniture and Related Product Manufacturing337000 | — | ◇ UNVERIFIED |
| ASArtistic Silver Plating INC | Signal Hill | CA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| ALAryzta LLC | Stockton | CA | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| ASAsco Sintering CO | Commerce | CA | Fabricated Metal Product Manufacturing332119 | — | ◇ UNVERIFIED |
| ABAsdm Beverly Hills | Santa Ana | CA | Chemical Manufacturing325620 | 1-19 | ◇ UNVERIFIED |
| AFA&s Finishing, LLC | Chatsworth | CA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| ACAshland Chemical CO | Colton | CA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| ACAshland Chemical CO | Newark | CA | Chemical Manufacturing325188 | — | ◇ UNVERIFIED |
| APAsm Precision INC | Rohnert Park | CA | Machinery Manufacturing333415 | 20-99 | ◇ UNVERIFIED |
| AAAssociated Aerospace Activities | San Leandro | CA | Transportation Equipment Manufacturing336411 | — | ◇ UNVERIFIED |
| ARAssociated Ready Mixed Concrete | San Diego | CA | Nonmetallic Mineral Product Manufacturing327310 | — | ◇ UNVERIFIED |
| AMAssured Manufacturing | Fremont | CA | Machinery Manufacturing333517 | 1-19 | ◇ UNVERIFIED |
 Astech Engineered Products | Santa Ana | CA | Fabricated Metal Product Manufacturing332811 | — | ◇ UNVERIFIED |
| ACAstro Chrome and Polishing CORP | Van Nuys | CA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| ARAtco Rubber Products Sacramento | Sacramento | CA | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| ABAtkinson Brick CO | Perris | CA | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| ABAtkinson Brick Company | Los Angeles | CA | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| ASAtlantic/pacific Shutter CO INC | Rancho Dominguez | CA | Furniture and Related Product Manufacturing337920 | — | ◇ UNVERIFIED |
| ATA to Z Metal Finishing | San Diego | CA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| APAts Products INC | Richmond | CA | Plastics and Rubber Products Manufacturing326113 | — | ◇ UNVERIFIED |
| APAts Products INC | Richmond | CA | Computer and Electronic Product Manufacturing334610 | — | ◇ UNVERIFIED |
| APAuburn Printers | Auburn | CA | Printing and Related Support Activities323111 | 1-19 | ◇ UNVERIFIED |
| APAustin Plastic INC | Huntington Beach | CA | Miscellaneous Manufacturing339113 | — | ◇ UNVERIFIED |
| APAutomation Printing | Los Angeles | CA | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| ARAutomotive Racing Products INC | Santa Paula | CA | Fabricated Metal Product Manufacturing332722 | — | ◇ UNVERIFIED |
| ATAvago Technologies US INC | San Jose | CA | Computer and Electronic Product Manufacturing334413 | — | ◇ UNVERIFIED |
| AGAvalon Glass & Mirror CO | Carson | CA | Nonmetallic Mineral Product Manufacturing327215 | — | ◇ UNVERIFIED |
| ADAvery Dennison | Rancho Cucamonga | CA | Paper Manufacturing322220 | — | ◇ UNVERIFIED |
| AMAvibank Mfg INC | Burbank | CA | Fabricated Metal Product Manufacturing332722 | — | ◇ UNVERIFIED |
| ABAvid Bioservices, INC | Tustin | CA | Chemical Manufacturing325414 | — | ◇ UNVERIFIED |
 Avon Protection Systems, INC. | Irvine | CA | Miscellaneous Manufacturing339113 | — | ◇ UNVERIFIED |
| BABacon Acquisitions LLC | Irvine | CA | Chemical Manufacturing325520 | — | ◇ UNVERIFIED |
| BIBac-pritchard INC | Merced | CA | Wood Product Manufacturing321213 | — | ◇ UNVERIFIED |
| BAB a E Systems | Ontario | CA | Computer and Electronic Product Manufacturing334511 | — | ◇ UNVERIFIED |
| BSBae Systems Maritime Solutions San Diego INC | San Diego | CA | Transportation Equipment Manufacturing336611 | — | ◇ UNVERIFIED |
| BIBaf Industries | Santa Ana | CA | Chemical Manufacturing325612 | — | ◇ UNVERIFIED |
| BPBagcraft Papercon Iii LLC | Hacienda Heights | CA | Paper Manufacturing322122 | — | ◇ UNVERIFIED |
| BFBaker Furnace | Brea | CA | Leather and Allied Product Manufacturing316110 | — | ◇ UNVERIFIED |
| BPBaker Petrolite CORP | Santa Fe Springs | CA | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| BCBalda C Brewer INC | Oceanside | CA | Furniture and Related Product Manufacturing337215 | — | ◇ UNVERIFIED |
| BCBalda C Brewer INC | Ontario | CA | Furniture and Related Product Manufacturing337215 | — | ◇ UNVERIFIED |
| BCBaldwin Contracting (road 7) | Orland | CA | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
