| Aasan Elektro AS | Manufacturing | 2024 |
| Aasmundsens Bakeri Telemarksbakern Efft. AS | Manufacturing | 2007 |
| Angre Hytteservice AS | Water & waste | 2026 |
| Angre Invest AS | Construction | 2005 |
| Barstad IT AS | Information & communication | 2020 |
| Bindingsnuten AS | Information & communication | 2023 |
| Blika Eigedom AS | Real estate | 2011 |
| Blikavegen SA | Administrative & support | 2018 |
| Byggmester T.A. Gustavsen AS | Construction | 2007 |
| Flatdal Bygg AS | Construction | 2016 |
| Flatdal Handlaft AS | Construction | 2005 |
| Flatdal Holding AS | Wholesale & retail | 2013 |
| Flatdal Konsult Nuf | Professional & scientific | 2024 |
| Flatdal Mekaniske AS | Manufacturing | 2024 |
| Guri Bjørnfeld Import Ans | Wholesale & retail | 1988 |
| Habbarskvammen AS | Arts & recreation | 2019 |
| Hallvard Nordskog AS | Professional & scientific | 1998 |
| Haugan Totalentreprenør AS | Professional & scientific | 2008 |
| Hauganvegen SA | Real estate | 1991 |
| Henry Mæland AS | Professional & scientific | 2014 |
| Hot Lyd AS | Arts & recreation | 2024 |
| Håkon Fjågesund Tradisjonshandverk AS | Construction | 2021 |
| Håkon M Solheim Siv.Ark AS | Professional & scientific | 2022 |
| Intrepix B.V. Nuf | Information & communication | 2025 |
| Juvcon AS | | 2025 |
| Klart Det Kan AS | Construction | 2024 |
| Kongehella AS | Hospitality | 2013 |
| KT Solutions AS | Information & communication | 2026 |
| Langlim Vassverk SA | Water & waste | 2017 |
| Lien Fjellgard AS | Hospitality | 2012 |
| Medianett AS | Information & communication | 1987 |
| Mytiske Telemark SA | Other services | 2018 |
| Natadal AS | Hospitality | 2023 |
| Natadal Kiste Holding AS | | 2024 |
| Ni Liv AS | Arts & recreation | 2013 |
| Norvoll AS | Construction | 2013 |
| Nutheim Gjestgiveri AS | Hospitality | 2013 |
| Nørsteteig Kraftverk AS | Energy | 2007 |
| Realion AS | Professional & scientific | 2026 |
| Reframe Lab AS | Professional & scientific | 2025 |
| Rydland AS | Construction | 2018 |
| Seljord Hytteservice Ans | Administrative & support | 2003 |
| Sitje Holding AS | Administrative & support | 2018 |
| Skogsfjord AS | Wholesale & retail | 2015 |
| Skorve Samdrift Da | Agriculture & fishing | 2014 |
| Stabbenuten AS | Construction | 2015 |
| Studio Hanne Kvig AS | Professional & scientific | 2024 |
| Svareng Invest AS | | 2026 |
| Svartebergvegen SA | Agriculture & fishing | 2016 |
| Telespinn AS | Manufacturing | 2008 |
| Teluseter Holding AS | | 2015 |
| Torsdalen AS | Manufacturing | 2026 |
| Torsdalen Invest AS | | 2026 |
| Tradisjonstre Da | Manufacturing | 2002 |
| Tårån Forlag Da | Information & communication | 2021 |
| Vana AS | Professional & scientific | 2020 |
| Vassmoen AS | Administrative & support | 2006 |
| Veglaget Natadal-Sitje SA | Real estate | 1990 |
| Vest Telemark Entreprenør AS | Construction | 2003 |
| Vest-Telemark Teknologipark AS | Mining & quarrying | 2013 |
| Wanderlust Yoga AS | Education | 2018 |
| Århus Næringspark AS | Real estate | 2011 |
| Øvre Flatdal Vatningslag | Agriculture & fishing | 1995 |
| Øyland Eigedom AS | Real estate | 2013 |
| Øyland Mat AS | Wholesale & retail | 2013 |