| IBEW Local Union No 126 | Related tax-exempt org | Labor union | PA | 231302203 |
| IBEW Local Union No 126 Retirement Plan | Related tax-exempt org | Retirement plan | PA | 232156093 |
| IBEW Local Union No 126 OSHE | Related tax-exempt org | Safety & training fund | PA | 231919421 |
| PENN DEL Jersey Chapter NECA | Related tax-exempt org | Association of employers | PA | 231279973 |
| Advanced Fiber | Related taxable corporation/trust | — | — | — |
| Agostino Utilities LLC | Related taxable corporation/trust | — | — | — |
| Alaska Electrical | Related taxable corporation/trust | — | — | — |
| Aldridge Electric INC | Related taxable corporation/trust | — | — | — |
| American Lighting & Signali | Related taxable corporation/trust | — | — | — |
| AMOS Contracting | Related taxable corporation/trust | — | — | — |
| AMPP Construction LLC | Related taxable corporation/trust | — | — | — |
| Andis LLC | Related taxable corporation/trust | — | — | — |
| ANR Electric LLC | Related taxable corporation/trust | — | — | — |
| Appalachian Utility Service | Related taxable corporation/trust | — | — | — |
| Armour & SONS Electric | Related taxable corporation/trust | — | — | — |
| Asplundh Electrical Testing | Related taxable corporation/trust | — | — | — |
| Atkins Electric CO INC | Related taxable corporation/trust | — | — | — |
| Bailey and Bailey Power DIS | Related taxable corporation/trust | — | — | — |
| Battaglia Electric INC | Related taxable corporation/trust | — | — | — |
| Bluroc LLC | Related taxable corporation/trust | — | — | — |
| Bronder Technical Services | Related taxable corporation/trust | — | — | — |
| Bruce & Merrilees ELEC CO | Related taxable corporation/trust | — | — | — |
| C3M Power Systems LLC | Related taxable corporation/trust | — | — | — |
| Caliber Field Services INC | Related taxable corporation/trust | — | — | — |
| Canton Electrical Welfare F | Related taxable corporation/trust | — | — | — |