Aquatic Enterprises INC | Seattle | — | ● ACTIVE |
| CGCertainteed Gypsum Manufacturing | Seattle | — | ◐ LIKELY ACTIVE |
| HCHot Cell Services CORP | Kent | — | ◐ LIKELY ACTIVE |
| LCLafarge Cement CO - Seattle Facility | Seattle | — | ◐ LIKELY ACTIVE |
| UGUS Gypsum Corporation Auburn | Auburn | 20–99 | ◐ LIKELY ACTIVE |
| APAir Products Mfg CORP Sea | Seattle | — | ◐ LIKELY ACTIVE |
| CPCentral Pre Mix Concrete Products | Kent | — | ◇ UNVERIFIED |
| GNGlacier Northwest East Marginal Way | Seattle | — | ◇ UNVERIFIED |
| GNGlacier Nw Kenmore | Kenmore | — | ◇ UNVERIFIED |
| UVUtility Vault | Auburn | — | ◇ UNVERIFIED |
| HGHartung Glass Tukwila WA | Tukwila | 100–499 | ◐ LIKELY ACTIVE |
| NANorthwest Aggregates Snoqualmie | Snoqualmie | — | ◐ LIKELY ACTIVE |
| CSCadman Seattle INC | Seattle | — | ◇ UNVERIFIED |
| CTCertain Teed Gypsum INC | Kent | — | ◇ UNVERIFIED |
| GNGlacier Nw Reichhold Mtca | Seattle | — | ◇ UNVERIFIED |
| MMMutual Materials CO Newcastle | Bellevue | — | ◇ UNVERIFIED |
| OPOlympian Precast INC | Redmond | — | ◇ UNVERIFIED |
| PCPcl Construction Services | Auburn | — | ◇ UNVERIFIED |
| SCStoneway Concrete Houser Way | Renton | — | ◇ UNVERIFIED |
| VSVashon Sand and Gravel INC | Vashon | — | ◇ UNVERIFIED |
| CCertainTeed | Seattle | 100–499 | ◐ LIKELY ACTIVE |
| FCFLOFORM Countertops | Kent | 100–499 | ◐ LIKELY ACTIVE |
| GNGlacier Northwest dba CalPortland (Duwamish Ready Mix) | Seattle | 20–99 | ◐ LIKELY ACTIVE |
| GNGlacier Northwest dba CalPortland (Kenmore Ready Mix) | Kenmore | 20–99 | ◐ LIKELY ACTIVE |
| GNGlacier Northwest dba CalPortland (Snoqualmie Ready Mix) | Snoqualmie | 1–19 | ◐ LIKELY ACTIVE |
| GNGlacier Northwest dba CalPortland (WA Administration) | Federal Way | 20–99 | ◐ LIKELY ACTIVE |
| HGHartung Glass Renton | Renton | 100–499 | ◐ LIKELY ACTIVE |
| HCHcs Corporation | Kent | — | ◐ LIKELY ACTIVE |
| HPHm Pacific Northwest, INC. | Redmond | — | ◐ LIKELY ACTIVE |
| HPHM PNW- Issaquah | Issaquah | 20–99 | ◐ LIKELY ACTIVE |
| HPHM PNW- Seattle RMC | Seattle | 20–99 | ◐ LIKELY ACTIVE |
| KKent | Kent | 20–99 | ◐ LIKELY ACTIVE |
| PSPreston Singletary, INC | Seattle | — | ◐ LIKELY ACTIVE |
| PWPS Washington Auburn 875 A Street | Auburn | 1–19 | ◐ LIKELY ACTIVE |
| SASales and Distribution Center Seattle | Kent | 20–99 | ◐ LIKELY ACTIVE |
| WAWashington Auburn 1812 B Street | Auburn | 20–99 | ◐ LIKELY ACTIVE |
| WKWashington Kent 6911 S 196th St | Kent | 20–99 | ◐ LIKELY ACTIVE |
| WKWashington Kirkland 3801 108th Avenue | Kirkland | 1–19 | ◐ LIKELY ACTIVE |
| AGAsh Grove Cement Company-seattle | Seattle | — | ◇ UNVERIFIED |
| CWCourt Walker LLC | Seattle | — | ◇ UNVERIFIED |
| CWCourt Walker LLC | Seattle | — | ◇ UNVERIFIED |
| CWCourt Walker LLC | Seattle | — | ◇ UNVERIFIED |
| CPCumberland Property | Cumberland | — | ◇ UNVERIFIED |
| GGlassybaby | Seattle | — | ◇ UNVERIFIED |
| GTGranite Transformations of Kin | Seattle | — | ◇ UNVERIFIED |
| HUHolcim US INC Ravensdale | Ravensdale | — | ◇ UNVERIFIED |
| IMIcon Materials | Seattle | — | ◇ UNVERIFIED |
| MGMaterial Good LLC | Seattle | — | ◇ UNVERIFIED |
Miles Sand & Gravel CO | Auburn | — | ◇ UNVERIFIED |
| MAModular Arts | Kent | — | ◇ UNVERIFIED |