| SMW Local 73 Pension Fund | Related tax-exempt org | Provide pension benefits to members | IL | 516126221 |
| SMW Local Union 73 | Related tax-exempt org | Organize workers for economic, moral and social advancement | IL | 361764263 |
| SMW Local 73 APR Fund and Journeymen's TRNG Fund | Related tax-exempt org | Provide for support, maintenance and administration of APPR training program | IL | 366127341 |
| Int'l Assoc of Smart Local No 73 LMCC Trust Fund | Related tax-exempt org | Labor management cooperative committee | IL | 326445729 |
| SMW Local 73 Annuity Fund | Related tax-exempt org | Provide annuity benefits to members | IL | 205002115 |
| Smacna Greater Chicago | Related tax-exempt org | Contributing employer | IL | 464927322 |
| At Mechanical LLC | Related partnership | Contributing employer | — | — |
| Interactive Building Solutions LLC | Related partnership | Contributing employer | — | — |
| Nations ROOF North LLC | Related partnership | Contributing employer | — | — |
| A-1 Roofing Company | Related taxable corporation/trust | Contributing employer | — | — |
| Aaron Environmental Services | Related taxable corporation/trust | Contributing employer | — | — |
| Admiral Heating INC | Related taxable corporation/trust | Contributing employer | — | — |
| Advance Mechanical Systems INC | Related taxable corporation/trust | Contributing employer | — | — |
| AERO Service Test & Balancing | Related taxable corporation/trust | Contributing employer | — | — |
| AIR Comfort Corporation | Related taxable corporation/trust | Contributing employer | — | — |
| AIR CON Refrigeration | Related taxable corporation/trust | Contributing employer | — | — |
| AIR Design Systems INC | Related taxable corporation/trust | Contributing employer | — | — |
| AIR RITE HTG LATR Corp | Related taxable corporation/trust | Contributing employer | — | — |
| AIR Supply | Related taxable corporation/trust | Contributing employer | — | — |
| Albert J Wagner & SON LLC | Related taxable corporation/trust | Contributing employer | — | — |
| ALL American COMM Roofing INC | Related taxable corporation/trust | Contributing employer | — | — |
| ALL Mechanical Industries | Related taxable corporation/trust | Contributing employer | — | — |
| Alloy Architectural Solutions | Related taxable corporation/trust | Contributing employer | — | — |
| Althoff Industries | Related taxable corporation/trust | Contributing employer | — | — |
| Amber Mechanical Contractors | Related taxable corporation/trust | Contributing employer | — | — |