| Insinööritoimisto Pontek Oy CVR 0201880-2 | BoardBoard of Directors | Since 2025 | — | Active |
| Insinööritoimisto W. Zenner Oy CVR 0570636-0 | BoardChairperson | Since 2025 | — | Active |
| Kiinteistö Oy Tahkon Majat CVR 0621060-7 | BoardChairperson | Since 2022 | — | Active |
| Oy Management Services Scandinavia Ab CVR 0678498-5 | BoardChairperson | Since 2022 | — | Active |
| Solwers Oyj CVR 0720734-6 | ManagementChief Executive Officer | Since 2025 | — | Active |
| Oy Polyplan Ab CVR 0916091-6 | BoardBoard of Directors | Since 2025 | — | Active |
| Finnmap Infra Oy CVR 0921976-2 | BoardBoard of Directors | Since 2026 | — | Active |
| Geounion Oy CVR 0944273-7 | BoardBoard of Directors | Since 2025 | — | Active |
| Davidsson Tarkela Siren Arkkitehdit Oy CVR 1025174-3 | BoardChairperson | Since 2025 | — | Active |
| Kalliotekniikka Consulting Engineers Oy CVR 1484723-7 | BoardChairperson | Since 2025 | — | Active |
| Inmeco Oy Rakennuskonsultit CVR 1637178-9 | BoardBoard of Directors | Since 2025 | — | Active |
| Taitotekniikka Oy CVR 1856600-2 | BoardBoard of Directors | Since 2025 | — | Active |
| Contria Oy CVR 2256664-6 | BoardBoard of Directors | Since 2025 | — | Active |
| Finexplo Oy CVR 2276784-3 | BoardBoard of Directors | Since 2025 | — | Active |
| Accado Oy Ab CVR 2308220-5 | BoardBoard of Directors | Since 2025 | — | Active |
| Lukkaroinen Arkkitehdit Oy CVR 2557243-5 | BoardBoard of Directors | Since 2025 | — | Active |
| Plan-Air Oy CVR 2794656-8 | BoardChairperson | Since 2025 | — | Active |
| Goddars Ab CVR 3148867-8 | BoardBoard of Directors | Since 2020 | — | Active |
| Oy MEATEKO Ab CVR 3174705-1 | OtherDeputy Member | Since 2021 | — | Active |
| Oy Y-upp Ab CVR 3174707-8 | BoardBoard of Directors | Since 2021 | — | Active |
| Solwers Finland Oy CVR 3331322-2 | BoardBoard of Directors | Since 2026 | — | Active |
