| NoHoSu AB CVR 5566503529 | BoardBoard of Directors | Since 2021 | — | Active |
| Optocorp AB CVR 5567236954 | BoardBoard of Directors | Since 2022 | — | Active |
| Svensk Infrastruktur AB CVR 5567321566 | BoardBoard of Directors | Since 2020 | — | Active |
| X3 Capital AB CVR 5567473565 | BoardBoard of Directors | Since 2022 | — | Dissolved |
| Optocorp Holding AB CVR 5567600969 | BoardBoard of Directors | Since 2022 | — | Active |
| Gardio AB CVR 5568094998 | BoardBoard of Directors | Since 2020 | — | Active |
| Open Infra Group AB CVR 5568216401 | BoardBoard of Directors | Since 2020 | — | Active |
| Open Infra Operator AB CVR 5569645707 | BoardBoard of Directors | Since 2020 | — | Active |
| Open Infra ISP Production International AB CVR 5590693957 | BoardBoard of Directors | Since 2022 | — | Active |
| Internetnord AB CVR 5590903752 | BoardBoard of Directors | Since 2022 | — | Active |
| Fiber Construction Northern Europe AB CVR 5592136997 | BoardBoard of Directors | Since 2025 | — | Active |
| Open Infra Tyskland AB CVR 5592142516 | BoardBoard of Directors | Since 2020 | — | Active |
| Sonic Invest AB CVR 5592858012 | BoardBoard of Directors | Since 2022 | — | Dissolved |
| Open Infra USA AB CVR 5592919954 | BoardBoard of Directors | Since 2022 | — | Active |
| Open Infra Business AB CVR 5592919962 | BoardBoard of Directors | Since 2022 | — | Active |
| Open Infra UK AB CVR 5592919996 | BoardBoard of Directors | Since 2022 | — | Active |
| Open Infra International AB CVR 5593246324 | BoardBoard of Directors | Since 2022 | — | Active |
| Optocorp Germany AB CVR 5593309023 | BoardBoard of Directors | Since 2022 | — | Active |
| Open Infra TopCo AB CVR 5593332280 | BoardBoard of Directors | Since 2022 | — | Active |
| Open Infra MidCo AB CVR 5593367179 | BoardBoard of Directors | Since 2022 | — | Active |
| Open Infra Core 2022 AB CVR 5593367187 | BoardBoard of Directors | Since 2022 | — | Dissolved |
| Open Infra Core 2023 AB CVR 5593376733 | BoardBoard of Directors | Since 2022 | — | Dissolved |
| FGI Finance AB CVR 5594045790 | BoardBoard of Directors | Since 2022 | — | Active |
| Fiber Connection NA AB CVR 5594200619 | BoardBoard of Directors | Since 2023 | — | Active |
| Open Infra Core 2024 AB CVR 5594766569 | BoardBoard of Directors | Since 2024 | — | Active |
| Open Infra Core 2025 AB CVR 5595273813 | BoardBoard of Directors | Since 2025 | — | Active |