| SMW Health Fund of Local 19 | Related tax-exempt org | Health fund | — | 231324693 |
| SMW Pension Fund of Local 19 | Related tax-exempt org | Pension fund | — | 231494364 |
| SMW Annuity Fund of Local 19 | Related tax-exempt org | Annuity fund | — | 232245696 |
| SMW Local 19 PEL | Related tax-exempt org | Political | — | 232503973 |
| SMW Local 19 Scholarship Fund | Related tax-exempt org | Scholarship fund | — | 232470754 |
| SMW Local 19 | Related tax-exempt org | Labor union | PA | 231077755 |
| A a a Sheet Metal INC | Related taxable corporation/trust | — | — | — |
| A C Gentry | Related taxable corporation/trust | — | — | — |
| A D S INC | Related taxable corporation/trust | — | — | — |
| A S L Refrigeration INC | Related taxable corporation/trust | — | — | — |
| A Zahner Company | Related taxable corporation/trust | — | — | — |
| AW Farrell & SON INC | Related taxable corporation/trust | — | — | — |
| ACCU-FLOW Balancing CO LLC | Related taxable corporation/trust | — | — | — |
| Advanced AIR Service Group | Related taxable corporation/trust | — | — | — |
| Aella Industries | Related taxable corporation/trust | — | — | — |
| Aerdux Incorporated | Related taxable corporation/trust | — | — | — |
| AIR Balancing Engineers | Related taxable corporation/trust | — | — | — |
| AIR Concepts INC | Related taxable corporation/trust | — | — | — |
| AIR Tight Heating & Cooling | Related taxable corporation/trust | — | — | — |
| AJM Mechanical LLC | Related taxable corporation/trust | — | — | — |
| Allied Power Services LLC | Related taxable corporation/trust | — | — | — |
| American Mechanical & Contract | Related taxable corporation/trust | — | — | — |
| ASC Sheet Metal LLC | Related taxable corporation/trust | — | — | — |
| AXIS Kitchen Installations LL | Related taxable corporation/trust | — | — | — |
| Blanski Energy Management | Related taxable corporation/trust | — | — | — |