| Company name | Reg. code |
|---|---|
| SEFRONE OÜ | 17023904 |
| SEFEON OÜ kustutatud | 11699463 |
| PETRONE & PETRONE OÜ | 12983278 |
| SELVONE OÜ | 17281948 |
| STARONE OÜ | 17414415 |
| SERIONE OÜ kustutatud | 11223571 |
| ESTRONE OÜ kustutatud | 11063297 |
| SOFROSE OÜ | 16950146 |
| SEKTONE OÜ kustutatud | 10307900 |
| SOFRONES OÜ | 16711246 |
| SERMONE OÜ | 12213284 |
| DECRONE OÜ kustutatud (former name Decrone UÜ) | 14047873 |
| RETRONE OÜ (former name Retrone UÜ) | 14165087 |
| SEZONE OÜ | 16259639 |
| SERENE OÜ | 14216991 |
| SETRON OÜ kustutatud (former name Setron UÜ) | 16028472 |
| PETRONE PRINT OÜ | 11351624 |
| DEKRONE HOLDING OÜ kustutatud (former name Dekrone Holding UÜ) | 14940051 |
| SOFTONE CORP OÜ kustutatud | 14421372 |
| FERRONE GROUP OÜ kustutatud | 12097708 |
| SERRONI MT OÜ | 14315032 |
| EFRON OÜ | 10866232 |
| SERON OÜ | 16814354 |
| MERCK SERONO OÜ | 11694678 |
| SERENE CREATIONS OÜ | 17111034 |
| SEROWE CONSULTING OÜ kustutatud | 12008877 |
| SERENE SLEEP OÜ | 16827782 |
| SERENE REISIBÜROO OÜ kustutatud | 10692022 |
| SERENE LILLED OÜ | 10981565 |
| SERENE CLOUD OÜ | 17275735 |
| DERONE TRADE OÜ kustutatud (former name Derone Trade UÜ) | 16234065 |
| VERONE EHITUS OÜ kustutatud (former name Verone Ehitus UÜ) | 16120812 |
| MERONE INVEST OÜ (former name Merone Invest UÜ) | 16653862 |
| SEKRON RMP OÜ kustutatud | 12810916 |
| SEAFRONT PROPERTY HOLDING OÜ | 12624786 |
| SERVONE S.T. OÜ kustutatud | 10649049 |
| SEAFRONT CAPITAL MANAGEMENT OÜ | 11469609 |
| EFRON ASSETS OÜ (former name Hausers Assets 1 OÜ) | 17052610 |
| SERON EHITUS OÜ (former name Seron Ehitus UÜ) | 14079887 |
| ZERONE INFORMATION TECHNOLOGY OÜ kustutatud | 14545536 |
| BERINGIN KAMPUNK OÜ (former name Severon Trade OÜ) | 14246816 |