| Stenfast i Stenungsund AB CVR 5560739202 | BoardDeputy Board Member | Since 2022 | — | Active |
| VÄSTKUSTDOLOMITEN Aktiebolag CVR 5562305564 | BoardDeputy Board Member | Since 2022 | — | Active |
| Stenfast i Stenungsund Aktiebolag CVR 5564269669 | BoardDeputy Board Member | Since 2023 | — | Dissolved |
| Mikael Gustavsson Förvaltnings AB CVR 5564368461 | BoardBoard of Directors | Since 2023 | — | Dissolved |
| Fastigheten Lilla Stranden AB CVR 5564505310 | BoardDeputy Board Member | Since 2019 | — | Dissolved |
| OB Förvaltnings AB CVR 5566288469 | BoardBoard of Directors | Since 2022 | — | Active |
| Martin Gösfeldt-Bilar i Stenungsund Aktiebolag CVR 5566577333 | BoardDeputy Board Member | Since 2022 | — | Active |
| Objektbyggen Väst AB CVR 5566601000 | BoardBoard of Directors | Since 2019 | — | Dissolved |
| Martin Gösfeldt Fastighets AB CVR 5566788237 | BoardDeputy Board Member | Since 2019 | — | Dissolved |
| Stenfast Holding i Stenungsund AB CVR 5568470073 | BoardDeputy Board Member | Since 2022 | — | Active |
| Stenälv Fastighets AB CVR 5569108029 | BoardBoard of Directors | Since 2019 | — | Dissolved |
| Jamg i Stenungsund AB CVR 5591765259 | BoardDeputy Board Member | Since 2022 | — | Active |
| Matboden Väst AB CVR 5593632572 | BoardBoard of Directors | Since 2022 | — | Active |
| RG Entreprenad Väst AB CVR 5593703142 | BoardDeputy Board Member | Since 2022 | — | Active |
| Stenfast Bygg-och Fastighetsskötsel AB CVR 5593858334 | BoardDeputy Board Member | Since 2022 | — | Active |
| SEOO Bemanning AB CVR 5593893448 | BoardBoard of Directors | Since 2023 | — | Active |
| Stenfast Förvaltning AB CVR 5594649088 | BoardDeputy Board Member | Since 2024 | — | Active |
| Fastigheten Stenfast lilla strandvägen Stenung 16:5 AB CVR 5594649096 | BoardDeputy Board Member | Since 2023 | — | Active |
| Bg Gustavssons Entreprenad AB CVR 5594728734 | BoardDeputy Board Member | Since 2024 | — | Active |
| KvalitetsMark I Väst AB CVR 5595199380 | BoardBoard of Directors | Since 2025 | — | Active |