| Nordigard Anlegg AS | Construction | 2020 |
| Norsk Skieventyr AS | Hospitality | 1989 |
| Nyland Trevarefabrikk AS | Manufacturing | 1980 |
| Omtveit Invest AS | Real estate | 2006 |
| Opsund Invest AS | Financial services | 2018 |
| Ove Holding AS | | 2025 |
| Pentacle AS | Administrative & support | 2022 |
| Rebreathe AS | Professional & scientific | 2024 |
| Renholdsservice AS | Administrative & support | 2018 |
| Rimelige Boliger AS | Real estate | 2022 |
| Råmunddal Invest AS | | 2005 |
| Salong 19 AS | Other services | 2006 |
| Sandland AS | Real estate | 2020 |
| Sandland Eiendom AS | Real estate | 2022 |
| Selma Utvikling AS | Real estate | 2022 |
| Sightvision AS | Professional & scientific | 2014 |
| Sigurd Nørstrud AS | Real estate | 1972 |
| Simulatorgolf AS | Administrative & support | 2020 |
| Skindalen Invest AS | Wholesale & retail | 2005 |
| Skogsbilveglaget Selvatn Samvirkeforetak | Real estate | 1966 |
| Skorve Eigedom AS | Construction | 2005 |
| Skorve Gruppen AS | Construction | 2005 |
| Slettemeås Invest AS | Financial services | 2006 |
| Stensrud Bygg Og Taksering AS | Construction | 2021 |
| Storhaug Invest AS | Construction | 2006 |
| Storvegen 222 AS | Real estate | 2024 |
| STR8LINE AS | Professional & scientific | 2020 |
| Strømstad Elektro AS | Construction | 2010 |
| Strømstad Holding AS | Construction | 2005 |
| Styringsteknikk AS | Construction | 2013 |
| Ståland AS | | 2026 |
| Sverre Ruud Manufaktur AS | Wholesale & retail | 1981 |
| Systemutvikler Arnstein Berg AS | Information & communication | 2022 |
| Teia AS | | 2023 |
| Telemark Fjell Og Anlegg AS | Administrative & support | 2021 |
| Telemark Næringshage AS | Professional & scientific | 2012 |
| Telemark Steinindustri AS | Mining & quarrying | 2025 |
| Telemark Tracking Ull AS | Professional & scientific | 2021 |
| Thor Heritage AS | Professional & scientific | 2023 |
| Tiltru AS | Information & communication | 2026 |
| Tomsen Sports AS | Manufacturing | 2025 |
| Tone Og Leif Harald Da | Arts & recreation | 2013 |
| Transisto AS | Other services | 2008 |
| Transisto Eigedom AS | | 2022 |
| Trygg Trafikkdirigering AS | Transport & logistics | 2022 |
| Ttek AS | Information & communication | 2026 |
| Valhalla Eigedom AS | Real estate | 2023 |
| Vardoge AS | Information & communication | 2020 |
| Vedi AS | Construction | 2015 |
| Veglaget Sundet-Kvennes Ba | Real estate | 2006 |
| Vest Drift AS | Construction | 2023 |
| Vest Telemark Vaktservice AS | Administrative & support | 2025 |
| Vest Telemark Økonomi Og Rekneskap AS | Professional & scientific | 1999 |
| Vest-Telemark Blad AS | Information & communication | 1973 |
| Vest-Telemark Forsikring AS | Financial services | 2017 |
| Vest-Telemark Næringsbygg AS | Real estate | 1971 |
| Vest-Telemark Næringspark AS | Real estate | 2012 |
| Vest-Telemark Skogsdrift AS | Agriculture & fishing | 2020 |
| Veterinær Marthe Magnushommen AS | Professional & scientific | 2026 |
| Veting Bil AS | Wholesale & retail | 2019 |
| Viking Bygg AS | Construction | 2018 |
| Villa Glede AS | Hospitality | 2018 |
| Viso Holding AS | Financial services | 2016 |
| VM Haugen Holding AS | | 2025 |
| Wisland Wear AS | Wholesale & retail | 1999 |
| Wærmo Holding AS | | 2023 |
| Østbye Skiwax AS | Manufacturing | 1970 |
| Øvre Telemark Samdistribusjon AS | Transport & logistics | 1993 |