| Stockholm-Saltsjön Aktiebolag CVR 5560017369 | BoardBoard of Directors | 2020 – 2020 | — | Active |
| John Mattson Fastighets Aktiebolag CVR 5560566977 | BoardBoard of Directors | 2020 – 2020 | — | Active |
| John Mattson Tomt AB CVR 5560776253 | BoardBoard of Directors | 2020 – 2021 | — | Active |
| John Mattson Projekt AB CVR 5565980496 | BoardBoard of Directors | 2020 – 2021 | — | Active |
| John Mattson Skolfastigheter AB CVR 5567030357 | BoardBoard of Directors | 2020 – 2021 | — | Active |
| John Mattson Butiksfastigheter AB CVR 5567928568 | BoardBoard of Directors | 2020 – 2021 | — | Active |
| John Mattson Fastighetsföretagen AB (publ) CVR 5568022858 | BoardBoard of Directors | 2020 – 2020 | — | Active |
| Dieng Nylander & Co AB CVR 5568170251 | BoardBoard of Directors | 2022 – 2025 | — | Active |
| Nobelhuset AB CVR 5568846421 | BoardBoard of Directors | 2020 – 2021 | — | Active |
| John Mattson Parkering Aktiebolag CVR 5569021206 | BoardBoard of Directors | 2020 – 2021 | — | Active |
| Resinova Lidingö Tryckregulatorn 1 AB CVR 5569091472 | BoardBoard of Directors | 2020 – 2021 | — | Active |
| Sveafastigheter Development AB CVR 5569851271 | BoardBoard of Directors | 2020 – 2022 | — | Active |
| Sveafastigheter Bostad Group AB CVR 5591265979 | BoardBoard of Directors | 2020 – 2021 | — | Active |
| John Mattson Käppala AB CVR 5591617500 | BoardBoard of Directors | 2020 – 2021 | — | Active |
| John Mattson Sollentuna Holding AB CVR 5592296619 | BoardBoard of Directors | 2020 – 2020 | — | Dissolved |
| SBB Sveafastigheter Bostad AB CVR 5592733363 | BoardBoard of Directors | 2021 – 2022 | — | Active |