| Swedform Trading AB CVR 5560403700 | BoardBoard of Directors | Since 2019 | — | Dissolved |
| Mastec AB CVR 5561912568 | BoardBoard of Directors | Since 2022 | — | Active |
| Mastec Fastigheter i Dalstorp AB CVR 5561933390 | BoardBoard of Directors | Since 2022 | — | Active |
| BPS MOTORSPORT Aktiebolag CVR 5562306216 | BoardBoard of Directors | Since 2019 | — | Dissolved |
| Mastec Plastema AB CVR 5562384148 | BoardBoard of Directors | Since 2022 | — | Active |
| Mastec Fastigheter i Ulricehamn AB CVR 5562771740 | BoardBoard of Directors | Since 2022 | — | Active |
| Mastec Precision AB CVR 5565118139 | BoardBoard of Directors | Since 2022 | — | Active |
| CCTech Aktiebolag CVR 5565459210 | BoardBoard of Directors | Since 2022 | — | Active |
| Mastec Fastigheter i Skillingaryd AB CVR 5567475404 | BoardBoard of Directors | Since 2022 | — | Active |
| Mastec Fastigheter i Vaggeryd AB CVR 5568220122 | BoardBoard of Directors | Since 2022 | — | Active |
| DK2 Sverige AB CVR 5591911721 | BoardBoard of Directors | Since 2022 | — | Active |
| Mastec Fastigheter Svarven AB CVR 5592162563 | BoardBoard of Directors | Since 2021 | — | Active |
| Mastec Solutions AB CVR 5592830987 | BoardBoard of Directors | Since 2022 | — | Active |
| Mastec Components AB CVR 5593048977 | BoardBoard of Directors | Since 2022 | — | Active |
| ACC in West AB CVR 5594456104 | BoardBoard of Directors | Since 2023 | — | Active |
| Mr Leverage Holding AB CVR 5594529652 | BoardBoard of Directors | Since 2025 | — | Active |