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| Fastum Ingarö Kontor AB CVR 5563050193 | BoardBoard of Directors | Siden 2020 | — | Opløst |
| Chinbo Aktiebolag CVR 5563281657 | BoardBoard of Directors | Siden 2020 | — | Opløst |
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| Pinus Maskin AB CVR 5566714928 | BoardBoard of Directors | Siden 2020 | — | Aktiv |
| Castanum Förvaltning AB CVR 5567245013 | BoardBoard of Directors | Siden 2021 | — | Aktiv |
| Gävle byggteam AB CVR 5567525018 | BoardBoard of Directors | Siden 2025 | — | Aktiv |
| Högom AB CVR 5568157407 | BoardBoard of Directors | Siden 2022 | — | Aktiv |
| Fastum Collect AB CVR 5568514482 | BoardBoard of Directors | Siden 2020 | — | Opløst |
| Jamtbygg AB CVR 5569879165 | BoardBoard of Directors | Siden 2024 | — | Aktiv |
| Castanum Fastigheter AB CVR 5569926198 | BoardBoard of Directors | Siden 2021 | — | Aktiv |
| Hattens fastigheter Aktiebolag CVR 5590378708 | BoardBoard of Directors | Siden 2025 | — | Aktiv |
| Castanum Fastigheter 102 AB CVR 5590701560 | BoardBoard of Directors | Siden 2020 | — | Aktiv |
| CPP SG66 Holdings AB CVR 5591181176 | BoardBoard of Directors | Siden 2025 | — | Aktiv |
| Nordiska Projektgruppen NPG AB CVR 5591970347 | BoardBoard of Directors | Siden 2020 | — | Opløst |
| Aktiebolaget Posterias CVR 5592441090 | BoardBoard of Directors | Siden 2022 | — | Aktiv |
| Castanum Stadsberget 12 AB CVR 5594128117 | BoardBoard of Directors | Siden 2022 | — | Aktiv |
| Castanum Projekt AB CVR 5594263377 | BoardBoard of Directors | Siden 2023 | — | Aktiv |
| Castanum Projekt 1 AB CVR 5594283649 | BoardBoard of Directors | Siden 2023 | — | Aktiv |
| Picea Bygg i Timrå AB CVR 5595245035 | BoardBoard of Directors | Siden 2025 | — | Aktiv |
