| Philadelphia Laborers District Council | Related tax-exempt org | Labor union | PA | 230724848 |
| Baltimore-DC Laborers District Council | Related tax-exempt org | Labor union | MD | 520294027 |
| Aaron Enterprises | Related taxable corporation/trust | — | — | — |
| AL Gleeson ELEC CO INC | Related taxable corporation/trust | — | — | — |
| Allied Power Services LLC | Related taxable corporation/trust | — | — | — |
| APEX Pipeline Services INC | Related taxable corporation/trust | — | — | — |
| Appalachian Pipeline Contractor | Related taxable corporation/trust | — | — | — |
| Appellation Construction Services LLC | Related taxable corporation/trust | — | — | — |
| APRO Enterprises INC | Related taxable corporation/trust | — | — | — |
| ARC Construction | Related taxable corporation/trust | — | — | — |
| Associated Builders INC | Related taxable corporation/trust | — | — | — |
| AZCO INC | Related taxable corporation/trust | — | — | — |
| B&S Ironworks LLC | Related taxable corporation/trust | — | — | — |
| BAI Excavating LLC | Related taxable corporation/trust | — | — | — |
| Bailey Const CO LLC | Related taxable corporation/trust | — | — | — |
| BALT-DC Laborers DIST CNL | Related taxable corporation/trust | — | — | — |
| Barco Enterprises INC | Related taxable corporation/trust | — | — | — |
| Bartkowski Life Safety Corp | Related taxable corporation/trust | — | — | — |
| Berkel & CO INC | Related taxable corporation/trust | — | — | — |
| Bowen Engineering | Related taxable corporation/trust | — | — | — |
| Brandsafway | Related taxable corporation/trust | — | — | — |
| Brayman Construction Corporation | Related taxable corporation/trust | — | — | — |
| BUCH Construction INC | Related taxable corporation/trust | — | — | — |
| CRW Mechanical INC | Related taxable corporation/trust | — | — | — |
| C2 Cleaning INC | Related taxable corporation/trust | — | — | — |