| Company name | Reg. code |
|---|---|
| SSK OÜ | 12172491 |
| SSK TEAM OÜ | 11741780 |
| SSK WELDING OÜ | 14330161 |
| SSK THINKTANK 2017 OÜ kustutatud (former name Deltapoint OÜ) | 14161020 |
| SSK INVESTEERINGUD OÜ | 12369911 |
| NORDLAN GRUPP OÜ (former name SSK Company UÜ) | 12535427 |
| DIOCESE YANGAKATA OÜ (former name SSKV OÜ) | 14870940 |
| SIK SAK ILUSAKS OÜ | 11190506 |
| LSK OÜ | 17376519 |
| SHK OÜ kustutatud | 16351807 |
| SKK OÜ kustutatud | 16059633 |
| SFK OÜ | 10217930 |
| JSK OÜ kustutatud | 16072774 |
| SSC OÜ | 14301107 |
| SSH OÜ | 12076066 |
| SEK OÜ kustutatud | 10968518 |
| KSK OÜ kustutatud | 12085390 |
| ÄSK OÜ | 14222218 |
| SASK OÜ | 12988301 |
| SSJ OÜ | 16293493 |
| RSK OÜ kustutatud | 14783945 |
| SLK OÜ | 16918987 |
| SRK OÜ | 17161871 |
| KSK OÜ | 16841428 |
| SPK INVESTEERINGUD OÜ | 11324496 |
| SKS TEHNIKA OÜ | 10873195 |
| ASK ENTERPRISES OÜ (former name Anouk Knuffmann OÜ) | 16261576 |
| SKK HOLDING OÜ | 16988388 |
| SSJ EXPERTS OÜ kustutatud | 16117477 |
| OSK_DIGITAL OÜ | 16498226 |
| SSG JULIANUS OÜ | 11198034 |
| SÄK INVEST OÜ | 12528278 |
| ASK&UNDERSTAND OÜ kustutatud | 14645999 |
| SKK CAPITAL OÜ | 16499473 |
| SSC HOLDING OÜ kustutatud | 14778789 |
| HSK MEDIA OÜ | 16630393 |
| SAK IT OÜ | 16673867 |
| ASK CARL OÜ | 16700120 |
| BSK GAMES OÜ kustutatud (former name InterMassive OÜ) | 12994388 |
| SKS VALDUS OÜ | 14968107 |
| RSK PLUSS OÜ kustutatud | 11446012 |
| ASK ACCOUNTING OÜ | 16780106 |
| HSK VARAD OÜ | 14198282 |
| SRK HOLDINGS OÜ | 16537825 |
| KSK MOTORS OÜ | 16076175 |
| ESK SURF OÜ | 14122451 |
| DSK COMPANY OÜ | 16154946 |
| JSK IDA OÜ | 14504626 |
| SMK KAUBANDUS OÜ kustutatud | 12837269 |
| SSL MACEO OÜ | 14843825 |