| Company name | Reg. code |
|---|---|
| HERKHAM OÜ | 17453705 |
| HERKAM SERVICES OÜ | 11116088 |
| HERKSAN OÜ | 16059544 |
| HERKAL OÜ | 16178125 |
| HERKA TRANSPORT OÜ | 12773658 |
| "MERKSAM" OÜ (former name Merksam) | 12068931 |
| HEIKAM OÜ kustutatud | 14773013 |
| HEXHAM OÜ | 12587648 |
| BERKAM OÜ kustutatud | 11132621 |
| HELKAM OÜ | 16227349 |
| ARKHAM OÜ kustutatud | 16214737 |
| WERNHAM HOGG OÜ (former name DeHaan Group OÜ) | 14098356 |
| HESHAM EL-SHARAWI OÜ | 16442616 |
| 5+ TRADING OÜ kustutatud (former name CEPEP EESTI OÜ) | 10065265 |