| Company name | Reg. code |
|---|---|
| SIGMACOM OÜ kustutatud (former name SigmaCom UÜ) | 12982907 |
| SIGMACORP OÜ (former name SigmaCorp UÜ) | 14418482 |
| SIGMACORP OÜ kustutatud | 12016331 |
| SIGMATOR OÜ | 11531692 |
| SIGMACOMPANY OÜ kustutatud (former name Sigmacompany UÜ) | 14056777 |
| SIGMACOMPANY OÜ (former name Sigmacompany UÜ) | 17099066 |
| SYSMACOM OÜ | 12942397 |