| Bulgarian Association for Trenchless Technologies - BATT | UIC 175440534 | Stefan Zhelyazkov |
| Bulgarian Water Association - BWA | UIC 831199654 | Ivan Ivanov |
| Vodokanalproekt AD, Plovdiv | UIC 115753670 | Angelina Aleksandrova |
| Nekton 2 OOD | UIC 103622364 | Penko Stoyanov |
| Proni EOOD, Sofia | UIC 107527860 | Radost Dacheva |
| Raicommerce Construction AD | UIC 131458468 | Kiril Rangelov |
| Sorokov Instruments EOOD | UIC 123575107 | Georgi Sorokov |
| Stroitelna Mehanizatsia AD, Kazanlak | UIC 123033124 | Pavel Gruev |
| Phoenix BT EOOD | UIC 201354363 | Sunai Hadzha |
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