| Company name | Reg. code |
|---|---|
| ELCRO OÜ | 14386569 |
| ELCOR OÜ | 10453671 |
| ELCROCUS OÜ kustutatud (former name ALTAMM OÜ) | 14830107 |
| ELPRO ELEKTER OÜ (former name DRKD Service OÜ) | 12234200 |
| ELERO ELEKTER OÜ | 11431789 |
| ONNELLISIA TALOJA OÜ (former name Elcrocus OÜ) | 16862778 |
| ELRO INVESTEERINGUTE OÜ kustutatud | 11405007 |
| KOD ELRO OÜ | 17465559 |
| ELKOMER HOLDING OÜ kustutatud (former name ELERO Holding OÜ) | 10639358 |