| Serwent AB CVR 5565309233 | BoardBoard of Directors | Since 2025 | — | Active |
| Svensk Röranalys AB CVR 5566169198 | BoardBoard of Directors | Since 2025 | — | Active |
| ISAB Rörinfodring Syd AB CVR 5568135890 | BoardBoard of Directors | Since 2025 | — | Active |
| Bevakningsföretaget Sverige AB CVR 5568537632 | BoardDeputy Board Member | Since 2025 | — | Active |
| Andreas K Invest AB CVR 5569082919 | BoardDeputy Board Member | Since 2022 | — | Active |
| B F Bemanning AB CVR 5569402976 | BoardDeputy Board Member | Since 2021 | — | Active |
| Iret AB CVR 5591230577 | BoardBoard of Directors | Since 2025 | — | Active |
| ISAB Rörinfodring Väst AB CVR 5591371090 | BoardBoard of Directors | Since 2025 | — | Active |
| Serwent Rörinfodring Holding AB CVR 5591422174 | BoardBoard of Directors | Since 2025 | — | Active |
| Flush Rörinspektion AB CVR 5591707210 | BoardBoard of Directors | Since 2025 | — | Active |
| Custodire Holding AB CVR 5593654600 | BoardBoard of Directors | Since 2025 | — | Active |
| Röranalys i Sverige AB CVR 5594087669 | BoardBoard of Directors | Since 2025 | — | Active |
| Rörteknik i Uppland AB CVR 5594539214 | BoardBoard of Directors | Since 2025 | — | Active |
| Uppsala Relining AB CVR 5594540501 | BoardBoard of Directors | Since 2025 | — | Active |
| Brundin Services AB CVR 5595169979 | BoardBoard of Directors | Since 2025 | — | Active |
| Serwent Holding AB CVR 5595298380 | BoardBoard of Directors | Since 2025 | — | Active |
| Serwent Holding 2 AB CVR 5595298398 | BoardBoard of Directors | Since 2025 | — | Dissolved |
| Serwent Holding 3 AB CVR 5595364943 | BoardBoard of Directors | Since 2025 | — | Dissolved |
| Serwent Holding 4 AB CVR 5595364950 | BoardBoard of Directors | Since 2025 | — | Dissolved |
| BOSTADSRÄTTSFÖRENINGEN ODIN 11 CVR 7164192218 | BoardBoard of Directors | Since 2024 | — | Active |