| Name | Relationship | Activity | State | EIN |
|---|---|---|---|---|
| IRON Workers DC | Related tax-exempt org | Contributing employer | — | — |
| IRON Workers District Council Local 29 | Related tax-exempt org | Contributing employer | — | — |
| Ironworkers District Council of PAC NW | Related tax-exempt org | Contributing employer | — | — |
| Ironworkers Local 14 | Related tax-exempt org | Contributing employer | — | — |
| Ironworkers Local 29 | Related tax-exempt org | Contributing employer | — | — |
| Ironworkers Local 86 | Related tax-exempt org | Contributing employer | — | — |
| Oregon State BLDG & Const Trades Council | Related tax-exempt org | Contributing employer | — | — |
| Pacific NW Ironworkers Apprenticeship Trust | Related tax-exempt org | Contributing employer | — | — |
| PORT of Seattle PORT Const Services | Related tax-exempt org | Contributing employer | — | — |
| 10K Craft Install LLC | Related partnership | Contributing employer | — | — |
| Barin Group LLC | Related partnership | Contributing employer | — | — |
| Big C Industries LLC | Related partnership | Contributing employer | — | — |
| Blair Construction and Fabrication | Related partnership | Contributing employer | — | — |
| Blue Concrete LLC | Related partnership | Contributing employer | — | — |
| By Design Steel Services LLC | Related partnership | Contributing employer | — | — |
| Corona STUD & DECK LLC | Related partnership | Contributing employer | — | — |
| Diverse Contractors & Associate | Related partnership | Contributing employer | — | — |
| Dixon Studios LLC | Related partnership | Contributing employer | — | — |
| Elite Construction & Development | Related partnership | Contributing employer | — | — |
| England Industrial LLC | Related partnership | Contributing employer | — | — |
| Evergreen Erectors LLC | Related partnership | Contributing employer | — | — |
| Fulcrum Exteriors | Related partnership | Contributing employer | — | — |
| Harris PNW LLC | Related partnership | Contributing employer | — | — |
| Hercon Rebar & Post Tension LLC | Related partnership | Contributing employer | — | — |
| Herrejon Rebar LLC | Related partnership | Contributing employer | — | — |