| TRI State Joint Fund | Related tax-exempt org | 3rd party administrator for affiliated entities | CT | 060850110 |
| IBT Local Union 671 | Related tax-exempt org | Representation of union members | CT | 060400878 |
| Arborio Corp | Related taxable corporation/trust | — | CT | — |
| Hartford Provision Company | Related taxable corporation/trust | — | CT | — |
| M&P PIPE Jacking Corp | Related taxable corporation/trust | — | CT | — |
| Barnhart No EAST | Related taxable corporation/trust | — | TN | — |
| Mather Corporaton | Related taxable corporation/trust | — | CT | — |
| Tilcon CT INC | Related taxable corporation/trust | — | CT | — |
| Charter OAK Utility Const INC | Related taxable corporation/trust | — | CT | — |
| DEL-VA Corporation | Related taxable corporation/trust | — | CT | — |
| TLC OIL Company | Related taxable corporation/trust | — | CT | — |
| Galasso Materials | Related taxable corporation/trust | — | CT | — |
| O&G Industries INC | Related taxable corporation/trust | — | CT | — |
| Town of EAST Hartford | Related taxable corporation/trust | — | CT | — |
| Waters Construction Company | Related taxable corporation/trust | — | CT | — |
| Modelez International | Related taxable corporation/trust | — | CT | — |
| Valley OIL Company | Related taxable corporation/trust | — | CT | — |
| North EAST Transportation | Related taxable corporation/trust | — | CT | — |
| Heritage Village Master Association | Related taxable corporation/trust | — | CT | — |