| Company name | Reg. code |
|---|---|
| JAHKÜTE OÜ kustutatud (former name StiWeld OÜ) | 12838642 |
| MAAKÜTE OÜ | 11468373 |
| VIRU MAAKÜTE OÜ | 12593086 |
| TAHKUSE-P OÜ | 11466032 |
| TARTU MAAKÜTE OÜ (former name Tartumaa küte OÜ) | 17222325 |
| JAKUTA HOLDINGS OÜ | 17204758 |
| MILESTRAN OÜ (former name OÜ TAHKUSE) | 14287784 |