| ACAna Cosic | Hayward | CA | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
 Applied Biosystems, LLC | Hayward | CA | Chemical Manufacturing325413 | — | ◇ UNVERIFIED |
| AMApplied Materials | Hayward | CA | Machinery Manufacturing333242 | — | ◇ UNVERIFIED |
| ACAradigm Company | Hayward | CA | Computer and Electronic Product Manufacturing334510 | — | ◇ UNVERIFIED |
| ALArchitectural Lighting Works | Hayward | CA | Fabricated Metal Product Manufacturing332812 | — | ▲ REPORTED CLOSED |
| ABArsenal Biosciences, Inc.- Hayward Main | Hayward | CA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| AEAtlantic Envelope Company | Hayward | CA | Paper Manufacturing322230 | — | ◇ UNVERIFIED |
| AMAurora Motors | Hayward | CA | Transportation Equipment Manufacturing336320 | — | ◇ UNVERIFIED |
| ACAutocam California | Hayward | CA | Machinery Manufacturing333517 | — | ◇ UNVERIFIED |
| ACAutocam California | Hayward | CA | Computer and Electronic Product Manufacturing334413 | — | ◇ UNVERIFIED |
| ACAxis Construction | Hayward | CA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| BBBackyard Builders, Inc. | Hayward | CA | Wood Product Manufacturing321992 | — | ◇ UNVERIFIED |
| BDBadger Daylighting CORP. | Hayward | CA | Machinery Manufacturing333319 | — | ◇ UNVERIFIED |
| BMBar-one Manufacturing | Hayward | CA | Fabricated Metal Product Manufacturing332721 | — | ◇ UNVERIFIED |
| BRBaskin Robbins | Hayward | CA | Food Manufacturing311520 | — | ◇ UNVERIFIED |
| BUBaxalta US INC | Hayward | CA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| BHBaxter Hayward - Building H | Hayward | CA | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| BIBaxter International INC | Hayward | CA | Chemical Manufacturing325414 | — | ◇ UNVERIFIED |
| BABay Area Machinist | Hayward | CA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| BLBay Line Tool | Hayward | CA | Machinery Manufacturing333132 | — | ◇ UNVERIFIED |
| BPBayside Pharma INC | Hayward | CA | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| BPBell Plastics | Hayward | CA | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| BFBerkeley Farms INC | Hayward | CA | Food Manufacturing311511 | — | ◇ UNVERIFIED |
| BMBess Materials Testing and Inspection INC | Hayward | CA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| BOBig O Tire | Hayward | CA | Plastics and Rubber Products Manufacturing326211 | — | ◇ UNVERIFIED |
| BBBimbo Bakeries USA INC | Hayward | CA | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| BSBioassay Systems LLC | Hayward | CA | Chemical Manufacturing325413 | — | ◇ UNVERIFIED |
| BBionovo | Hayward | CA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| BGBlack Garlic, INC | Hayward | CA | Food Manufacturing311423 | — | ◇ UNVERIFIED |
| BVBlackswan Vascular | Hayward | CA | Miscellaneous Manufacturing339113 | — | ◇ UNVERIFIED |
| BIBmr-bridgeview Ii LP | Hayward | CA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| BLBmr-bridgeview LP | Hayward | CA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| BTBolt Threads, INC | Hayward | CA | Chemical Manufacturing325110 | — | ◇ UNVERIFIED |
| BMBomar Mail Service | Hayward | CA | Machinery Manufacturing333924 | — | ◇ UNVERIFIED |
| BBBuffalo Bill's Brewery | Hayward | CA | Food Manufacturing311942 | — | ◇ UNVERIFIED |
| BBunge | Hayward | CA | Food Manufacturing311224 | — | ◇ UNVERIFIED |
| CC3nano | Hayward | CA | Computer and Electronic Product Manufacturing334413 | — | ◇ UNVERIFIED |
| CMCaken' Me Crazy, LLC | Hayward | WI | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| CMCaken' Me Crazy, LLC | Hayward | WI | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| CHCal Hi Tec Finishing INC | Hayward | CA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| CCCaliber Cabinets, INC | Hayward | CA | Furniture and Related Product Manufacturing337110 | — | ◇ UNVERIFIED |
| CHCalifornia Hydronics CORP | Hayward | CA | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| COCalifornia Optical CORP. | Hayward | CA | Leather and Allied Product Manufacturing316993 | — | ◇ UNVERIFIED |
| CPCalifornia Pallets, INC. | Hayward | CA | Wood Product Manufacturing321920 | — | ◇ UNVERIFIED |
| CRCalwest Recycling LLC | Hayward | CA | Machinery Manufacturing333998 | — | ◇ UNVERIFIED |
| CHCamper Hutch | Hayward | CA | Transportation Equipment Manufacturing336214 | — | ◇ UNVERIFIED |
| CBCandesant Biomedical | Hayward | CA | Miscellaneous Manufacturing339113 | — | ◇ UNVERIFIED |
| CFCarmel Food Group, INC | Hayward | CA | Food Manufacturing311999 | — | ◇ UNVERIFIED |
 C&d Technologies | Hayward | CA | Electrical Equipment, Appliance & Component Manufacturing335911 | — | ◇ UNVERIFIED |
| CCCell-crete CORP | Hayward | CA | Nonmetallic Mineral Product Manufacturing327999 | — | ◇ UNVERIFIED |
