| SCSierra Concrete | Quincy | — | ◐ LIKELY ACTIVE |
| UGU.s. Granite | Rancho Cordova | — | ◐ LIKELY ACTIVE |
| WWWalters Wolf Precast | Fremont | — | ◐ LIKELY ACTIVE |
| AAA a Concrete Supply | Yuba City | — | ◇ UNVERIFIED |
| AAA & a Concrete Supply INC | Tracy | — | ◇ UNVERIFIED |
| ACA&a Concrete Supply INC Chico Plant | Chico | — | ◇ UNVERIFIED |
| ACAdams & Chittenden Scientific Glass Coop | Berkeley | — | ◇ UNVERIFIED |
| AEAero Engines INC | Los Angeles | — | ◇ UNVERIFIED |
| AGAgc Glass-2008 | Victorville | — | ◇ UNVERIFIED |
| APAmeron Pipe Group | Tracy | — | ◇ UNVERIFIED |
| ASAmeron Steel Fabrication Division | Fontana | — | ◇ UNVERIFIED |
| ALAndrew Lauren Surfaces | Santa Fe Springs | — | ◇ UNVERIFIED |
| ABAngelus Block CO INC | Fontana | — | ◇ UNVERIFIED |
| ABAngelus Block CO INC | Sun Valley | — | ◇ UNVERIFIED |
| ABAngelus Block Company | Oxnard | — | ◇ UNVERIFIED |
| AIAnnieglass INC | Watsonville | — | ◇ UNVERIFIED |
| ALArdex LP | Stockton | — | ◇ UNVERIFIED |
| ARAssociated Ready Mixed Concrete | San Diego | — | ◇ UNVERIFIED |
| ARAssociated Ready Mixed Concrete | Fountain Valley | — | ◇ UNVERIFIED |
| ABAtkinson Brick CO | Perris | — | ◇ UNVERIFIED |
| ABAtkinson Brick Company | Los Angeles | — | ◇ UNVERIFIED |
| AGAvalon Glass & Mirror CO | Carson | — | ◇ UNVERIFIED |
| BBBasalite Block | Tracy | — | ◇ UNVERIFIED |
| BRBender Ready Mix INC | Santa Fe Springs | — | ◇ UNVERIFIED |
| BRBerkeley Ready Mix Concrete | Berkeley | — | ◇ UNVERIFIED |
| BPBertelson Precast CORP | Modesto | — | ◇ UNVERIFIED |
| BWBest Way Marble & Tile CO INC | Los Angeles | — | ◇ UNVERIFIED |
| CMCalaveras Materials INC | Tracy | — | ◇ UNVERIFIED |
| CMCalaveras Materials INC | Lathrop | — | ◇ UNVERIFIED |
| CMCalaveras Materials INC | Turlock | — | ◇ UNVERIFIED |
| CSCalifornia State University at Los Angeles | Los Angeles | — | ◇ UNVERIFIED |
| CCCalportland Company | National City | — | ◇ UNVERIFIED |
| CCCalportland Company Lax Plant | Los Angeles | — | ◇ UNVERIFIED |
| CCCalportland Company Miramar | San Diego | — | ◇ UNVERIFIED |
| CCCalportland CO Santa Maria Plant | Santa Maria | — | ◇ UNVERIFIED |
| CCCalstone Company | San Martin | — | ◇ UNVERIFIED |
| CGCalstone Gilroy-oldcastle Apg | Gilroy | — | ◇ UNVERIFIED |
| CSCal St Univ Northridge | Northridge | — | ◇ UNVERIFIED |
| CCCardinal Cg | Moreno Valley | — | ◇ UNVERIFIED |
| CCCardinal Cg | Galt | — | ◇ UNVERIFIED |
| CCCastaic Clay Manufacturing Company Incorporated | Castaic | — | ◇ UNVERIFIED |
| CPCatalina Pacific Concrete CO Sun Valley Plant | Sun Valley | — | ◇ UNVERIFIED |
| CPCatalinia Pacific Concrete CO San Juan Plant | San Juan Capistrano | — | ◇ UNVERIFIED |
| CCementpro | Ontario | — | ◇ UNVERIFIED |
| CACemex Antioch | Antioch | — | ◇ UNVERIFIED |
| CCCemex Concord | Concord | — | ◇ UNVERIFIED |
| CCCemex Construction Materials Amador Plant | San Francisco | — | ◇ UNVERIFIED |
| CCCemex Construction Materials L P | Corona | — | ◇ UNVERIFIED |
| CCCemex Construction Materials L P | Perris | — | ◇ UNVERIFIED |
| CCCemex Construction Materials Pacific LLC | West Hollywood | — | ◇ UNVERIFIED |
