| 1C1863 CASE Limited Liability Co. | Orange | — | ◇ UNVERIFIED |
| 2D2140 Dupont LLC | Anaheim | — | ◇ UNVERIFIED |
| 3H3100 Harvard Street Holdings LLC | Santa Ana | — | ◇ UNVERIFIED |
| 3M3d Machine Company, INC. | Anaheim | — | ◇ UNVERIFIED |
| 3E3 Element Design LLC | San Juan Capistrano | — | ◇ UNVERIFIED |
| AEA-1 Engraving Co., Inc. | Anaheim | — | ◇ UNVERIFIED |
| AAAc & a LLC | Lake Forest | — | ◇ UNVERIFIED |
| ACAccion Const Iron & Windows Mfg | Santa Ana | — | ◇ UNVERIFIED |
| ADAccurate Deburring and Welding Systems | Anaheim | — | ◇ UNVERIFIED |
| AMAccurate Metal Solutions Anaheim, LLC | Anaheim | — | ◇ UNVERIFIED |
| APActive Plating INC | Santa Ana | — | ◇ UNVERIFIED |
| AUAcutek US INC | Fullerton | — | ◇ UNVERIFIED |
| AEAdc Enterprises INC Dba Automated Drilling Company | Orange | — | ◇ UNVERIFIED |
| ACAdvanced Cutting Tools INC | Huntington Beach | — | ◇ UNVERIFIED |
| ADAdvanced Display Systems Inc,blasius Ind | Stanton | — | ◇ UNVERIFIED |
| AIAdvanced Iron Concepts | Placentia | — | ◇ UNVERIFIED |
| AIAdvanced Iron Designs INC Dba Advanced Iron Concep | Placentia | — | ◇ UNVERIFIED |
| ATAdvance Tech Plating | Anaheim | — | ◇ UNVERIFIED |
| ATAdvance Tube Engineering | Huntington Beach | — | ◇ UNVERIFIED |
| APAerodyne Precision Machining | Huntington Beach | — | ◇ UNVERIFIED |
| ALAerofit LLC | Fullerton | — | ◇ UNVERIFIED |
| APAga Precision Systems | Santa Ana | — | ◇ UNVERIFIED |
| AGA & G Electropolish | Fountain Valley | — | ◇ UNVERIFIED |
| ACAir Cabin Engineering INC | Orange | — | ◇ UNVERIFIED |
 A & J Manufacturing CO | Tustin | — | ◇ UNVERIFIED |
| AEAlco Engineering & Tooling CORP Alco Eng & Tooling CORP | Santa Ana | — | ◇ UNVERIFIED |
| AMAlco Manufacturing INC | Santa Ana | — | ◇ UNVERIFIED |
| APAlejo Ps89-llc | Newport Beach | — | ◇ UNVERIFIED |
| ALA & L Finishes, INC | Anaheim | — | ◇ UNVERIFIED |
| AIAl Industries INC | Santa Ana | — | ◇ UNVERIFIED |
| AEAll-bann Enter INC | Fullerton | — | ◇ UNVERIFIED |
| AMAllied Modular Business Systems | Orange | — | ◇ UNVERIFIED |
| AHAlmond Home LLC | Costa Mesa | — | ◇ UNVERIFIED |
| AOAlpha Omega Swiss INC | Yorba Linda | — | ◇ UNVERIFIED |
| APAluminum Precision Prod Inc,alu Forge CO | Santa Ana | — | ◇ UNVERIFIED |
 Aluminum Precision Products INC | Santa Ana | — | ◇ UNVERIFIED |
| AMAlva Manufacturing | Placentia | — | ◇ UNVERIFIED |
| AOAmber Ornamental Iron | Irvine | — | ◇ UNVERIFIED |
| ASAmerican Sheet Metal | Anaheim | — | ◇ UNVERIFIED |
| AAAmf Anaheim LLC | Anaheim | — | ◇ UNVERIFIED |
| APAnaheim Precision Mfg | Orange | — | ◇ UNVERIFIED |
| ATAndres Technical Plating | Placentia | — | ◇ UNVERIFIED |
| ACAnochem Coatings | Santa Ana | — | ◇ UNVERIFIED |
| AIAnodyne INC | Santa Ana | — | ◇ UNVERIFIED |
| AMApplied Material Technologies INC Dba Fabcor Precision Sheet Metal Fab | Fountain Valley | — | ◇ UNVERIFIED |
| AApw | Anaheim | — | ◇ UNVERIFIED |
| AEApw Enclosures, INC. | Anaheim | — | ◇ UNVERIFIED |
| ATAranda Tooling INC | Huntington Beach | — | ◇ UNVERIFIED |
| AAArco Am/pm Stanton Plaza | Stanton | — | ◇ UNVERIFIED |
| ACArnold Circuits INC | La Habra | — | ◇ UNVERIFIED |
