| ENERGIMA FJELLREGIONEN AS CVR 927500051 | BoardBoard of Directors | Siden 2022 | — | Aktiv |
| SPENNING HOLDING AS CVR 929126963 | BoardBoard of Directors | Siden 2022 | — | Aktiv |
| ØSTA INVEST AS CVR 929269772 | BoardBoard of Directors | Siden 2022 | — | Aktiv |
| ALVDAL BLIKKENSLAGERVERKSTED AS CVR 985076898 | BoardBoard of Directors | Siden 2023 | — | Aktiv |
| DAG INGE ØSTGÅRD CVR 990063443 | OwnerOwner | Siden 2006 | — | Aktiv |
| ØSTA UTVIKLING AS CVR 917274126 | BoardBoard of Directors | Siden 2019 | — | Aktiv |
| ENERGIPLUSS AS CVR 918708057 | ManagementChief Executive Officer | Siden 2026 | — | Aktiv |
| ØSTA HOLDING AS CVR 923397981 | ManagementChief Executive Officer | Siden 2019 | — | Aktiv |
| ØSTA ELEKTRO AS CVR 923545395 | BoardBoard of Directors | Siden 2022 | — | Aktiv |
| ØSTA EIENDOM AS CVR 923545433 | BoardBoard of Directors | Siden 2019 | — | Aktiv |
| KRAPTER AS CVR 932424800 | BoardBoard of Directors | Siden 2023 | — | Aktiv |
| INSTALLASJONSSERVICE AS CVR 959954666 | BoardBoard of Directors | Siden 2022 | — | Aktiv |
| FLAX EIENDOMSUTVIKLING AS CVR 988408387 | BoardBoard of Directors | Siden 2013 | — | Aktiv |
| TELNESET VANNVERK CVR 993996564 | BoardBoard of Directors | Siden 2026 | — | Aktiv |
| ØSTGÅRD-703 HOLDING AS CVR 923311106 | ManagementChief Executive Officer | Siden 2019 | — | Aktiv |
