| E. Kannonlahti Oy CVR 0178158-2 | BoardBoard of Directors | Since 2026 | — | Active |
| Tarkkala Logistiikka Oy CVR 0607814-0 | BoardBoard of Directors | Since 2020 | — | Active |
| Konnekuljetus Oy CVR 0655482-1 | BoardBoard of Directors | Since 2025 | — | Active |
| Tarkkalan Kuljetus Oy CVR 0682489-5 | ManagementChief Executive Officer | Since 2012 | — | Active |
| Tarkkala Terminaalit Oy CVR 1548499-2 | BoardBoard of Directors | Since 2012 | — | Active |
| Kosken Megawatti Oy CVR 1854583-4 | BoardBoard of Directors | Since 2025 | — | Active |
| J M Metsänen Oy CVR 2166521-2 | BoardBoard of Directors | Since 2025 | — | Active |
| KonneService Oy CVR 2804989-3 | BoardBoard of Directors | Since 2025 | — | Active |
| Tarkkala Oy CVR 3171798-7 | BoardBoard of Directors | Since 2020 | — | Dissolved |
| Matec-Trailer Oy CVR 3223311-6 | BoardBoard of Directors | Since 2025 | — | Active |
| ERT Rakenne Oy CVR 3392961-7 | BoardBoard of Directors | Since 2026 | — | Active |
| Kannonlahti Forest Oy CVR 3436339-5 | BoardBoard of Directors | Since 2026 | — | Active |
| Tarkkala Tehdaspalvelut Oy CVR 3439263-9 | BoardBoard of Directors | Since 2024 | — | Active |
| Forest Villman Oy CVR 3599008-3 | BoardBoard of Directors | Since 2026 | — | Active |
