| Proton Finishing Eskilstuna AB CVR 5560412388 | BoardBoard of Directors | Since 2021 | — | Active |
| Proton Lighting AB CVR 5560486325 | BoardBoard of Directors | Since 2021 | — | Active |
| Proton Engineering Aktiebolag CVR 5560542671 | BoardBoard of Directors | Since 2021 | — | Active |
| Proton Industries AB CVR 5560721713 | BoardBoard of Directors | Since 2022 | — | Active |
| Proton Finishing Anderstorp Stans 8 AB CVR 5560788589 | BoardBoard of Directors | Since 2021 | — | Active |
| Cotec Labs AB CVR 5560917733 | BoardBoard of Directors | Since 2022 | — | Active |
| Proton Finishing Forsheda AB CVR 5562277268 | BoardBoard of Directors | Since 2021 | — | Active |
| Proton Finishing Hillerstorp AB CVR 5563633972 | BoardBoard of Directors | Since 2021 | — | Active |
| Proton AB CVR 5563725760 | BoardBoard of Directors | Since 2021 | — | Dissolved |
| MDS-Förlagsinvest Aktiebolag CVR 5563744423 | BoardBoard of Directors | Since 2022 | — | Active |
| Proton Finishing Anderstorp AB CVR 5564174513 | BoardBoard of Directors | Since 2021 | — | Active |
| Proton Finishing AB CVR 5564174539 | BoardBoard of Directors | Since 2021 | — | Active |
| Proton Finishing Anderstorp Stans 1 AB CVR 5564505021 | BoardBoard of Directors | Since 2021 | — | Active |
| Proton Group AB CVR 5564558772 | BoardBoard of Directors | Since 2022 | — | Active |
| Weldin Gothenburg AB CVR 5565126819 | BoardBoard of Directors | Since 2021 | — | Active |
| JL Safety AB CVR 5567089924 | BoardBoard of Directors | Since 2020 | — | Active |
| Cedoc AB CVR 5567884282 | BoardBoard of Directors | Since 2020 | — | Active |
| Proton Services AB CVR 5591259840 | BoardDeputy Board Member | Since 2022 | — | Active |