| Keskinäinen Kiinteistö Oy Kouvolan Askatu CVR 0886694-1 | OtherConfidential Clerk | 2021 – 2024 | — | Active |
| ISS Palvelut Oy CVR 0906333-1 | OtherConfidential Clerk | 2021 – 2025 | — | Active |
| Suomen Laatutakuu Palvelut Oy CVR 0956682-8 | OtherConfidential Clerk | 2021 – 2025 | — | Active |
| Tank Service Finland Oy CVR 1049516-6 | OtherConfidential Clerk | 2019 – 2020 | — | Active |
| Laania Oy CVR 1477919-0 | OtherConfidential Clerk | 2019 – 2021 | — | Active |
| Kiinteistö Oy Vantaan Tammiston Kauppatie 33 CVR 1650195-0 | OtherConfidential Clerk | 2019 – 2020 | — | Active |
| FS East Oy CVR 1749576-7 | OtherConfidential Clerk | 2021 – 2022 | — | Active |
| L&T Relations Oy CVR 1843407-7 | OtherConfidential Clerk | 2019 – 2021 | — | Dissolved |
| L&T Toimi Oy CVR 1843410-6 | OtherConfidential Clerk | 2019 – 2021 | — | Dissolved |
| ISS Palvelut Holding Oy CVR 2071865-0 | OtherConfidential Clerk | 2021 – 2025 | — | Active |
| ISS Ylläpitopalvelut Oy CVR 2129178-3 | OtherConfidential Clerk | 2021 – 2025 | — | Active |
| Oakland Service Oy CVR 2726320-6 | OtherConfidential Clerk | 2020 – 2021 | — | Active |
| L&T Työllistämispalvelut Oy CVR 2831469-3 | OtherConfidential Clerk | 2019 – 2021 | — | Dissolved |
| L&T Teollisuuspalvelut Oy CVR 3155936-8 | OtherConfidential Clerk | 2020 – 2021 | — | Active |
| L&T Kiinteistöpalvelut tukitoiminnot Oy CVR 3155937-6 | OtherConfidential Clerk | 2020 – 2021 | — | Active |
| L&T Ympäristöpalvelut Oy CVR 3155938-4 | OtherConfidential Clerk | 2020 – 2021 | — | Active |
