| A/S Scan African | Real estate | 1987 |
| Aarnes Eigedom AS | Professional & scientific | 2017 |
| Aarnes Gruppen Eiendom AS | Hospitality | 2014 |
| Aarnes Investering AS | Professional & scientific | 2014 |
| Aarnes Toppen AS | | 2000 |
| Aarnes Ved Og Vel AS | Administrative & support | 2022 |
| Aarnesgruppen AS | Hospitality | 2017 |
| Aarnesgruppen Holding AS | Hospitality | 1986 |
| Acapulka AS | Manufacturing | 2002 |
| Adonis Edb AS | Wholesale & retail | 1989 |
| Alien Autospa AS | Wholesale & retail | 2014 |
| Argan Drift AS | Hospitality | 2022 |
| Autolite AS | Wholesale & retail | 2023 |
| Axyon AS | | 2026 |
| Bedre Bedrifter AS | Real estate | 1976 |
| Boxad Norge AS | Real estate | 1999 |
| Breizaas AS | Information & communication | 2026 |
| Brenna Handel AS | Wholesale & retail | 2025 |
| Bringa Eiendom AS | Real estate | 2022 |
| Bringa Holding AS | Construction | 2022 |
| Bringa VVS & Industri AS | Construction | 2021 |
| Buen Hytter AS | Manufacturing | 2012 |
| Bård Langkaas Transport AS | Transport & logistics | 2004 |
| Bø Lift Og Maskinutleie AS | Administrative & support | 2016 |
| Bø Løypelag SA | Arts & recreation | 1990 |
| Bø Markiseindustri AS | Construction | 1986 |
| Constairs AS | Manufacturing | 2015 |
| D & V Bil Da | Wholesale & retail | 2011 |
| Dalen Fysikalske Institutt AS | Financial services | 2008 |
| Digrenes AS | Real estate | 2012 |
| Eika Eigedom AS | Real estate | 2021 |
| Eika Maskinsalg AS | Wholesale & retail | 2017 |
| Eikland Øko AS | Agriculture & fishing | 2016 |
| Ewåb AS | | 2024 |
| Farm Tech AS | Agriculture & fishing | 2018 |
| Febe Da | Professional & scientific | 2002 |
| Fimex AS | Wholesale & retail | 2009 |
| Finsveen Hårstudio AS | Other services | 2017 |
| Flåklypa Holding AS | Wholesale & retail | 2021 |
| FSG Norge AS | Wholesale & retail | 2011 |
| Galleri Nyhuus AS | Wholesale & retail | 2013 |
| GHM Invest AS | Agriculture & fishing | 2021 |
| God Start Bolig AS | Real estate | 2025 |
| Grenske Søndre Nes AS | Agriculture & fishing | 2012 |
| Grindebakkane SA | Real estate | 1962 |
| Grus & Anlegg AS | Construction | 1992 |
| Grønne Byggevarer AS | Wholesale & retail | 2021 |
| GS Byggtech AS | Professional & scientific | 2016 |
| Gtholding AS | | 2024 |
| Gvarv 2.0 AS | Manufacturing | 2017 |
| Gvarv Bakeri AS | Manufacturing | 1988 |
| Gvarv Bilverksted AS | Wholesale & retail | 2000 |
| Gvarv Eiendom AS | Real estate | 2017 |
| Gvarv Maskin Og Service AS | Construction | 2005 |
| H. Holte Eiendom AS | Real estate | 2021 |
| H. Holte Holding AS | Manufacturing | 2021 |
| Haugland Bygg AS | Construction | 2018 |
| Holtan Damtjønnvegen SA | Real estate | 1973 |
| Holte Industri AS | Manufacturing | 2000 |
| Holtskog Nyhuus Design Ans | Manufacturing | 1982 |
| Håtveit Holding AS | Professional & scientific | 2019 |
| I Øst Og Vest Invest AS | Manufacturing | 2020 |
| Iek Regnskap Og Rådgiving AS | Professional & scientific | 2021 |
| Igl Coatings Norway AS | Wholesale & retail | 2025 |
| Ingebret Storkaas AS | Real estate | 1982 |
| Isobygg Telemark-Vestfold AS | Construction | 2016 |
| J & Ad Bilauto AS | Wholesale & retail | 2020 |
| Janina AS | Professional & scientific | 2016 |
| Jernbaneteknikk AS | Construction | 2019 |
| Jesam Eiendom AS | Real estate | 2022 |
| K H Holding AS | Construction | 2017 |
| K.B Holding AS | | 2018 |
| Kaasin AS | | 2026 |
| KB Bygg & Anlegg AS | Construction | 2019 |
| Kea Holding AS | Real estate | 2015 |
| Kjemigutta AS | Wholesale & retail | 2024 |
| Kløcker Holding AS | | 2026 |
| Landbrukstjenester Telemark SA | Agriculture & fishing | 1995 |
| Langrønningen Kafé AS | Hospitality | 2024 |
| Langt Spenn AS | | 2025 |
| Laskemoen Eiendom AS | Construction | 2012 |
| Lauritzen & Co Eiendom Da | Real estate | 2003 |
| Leif Fossum Eiendom AS | Real estate | 1982 |
| Lekeplasskontrollen AS | Professional & scientific | 2016 |
| Lifjell Gruppen AS | | 2011 |
| Lindeliavegen SA | Real estate | 1962 |
| Linnestad AS | Real estate | 2007 |
| LLS Eiendom AS | Real estate | 2014 |
| Lorins Grill Da | Hospitality | 2011 |
| Lysne Musikk AS | Information & communication | 2023 |
| MBJ Eiendom AS | Real estate | 2021 |
| Midt Telemark Elektro AS | Construction | 2018 |
| Midt-Telemark Betong AS | Construction | 2023 |
| Midt-Telemark Budbiler AS | Transport & logistics | 2020 |
| Midt-Telemark Eiendom AS | Real estate | 2016 |
| Midt-Telemark Skog AS | Agriculture & fishing | 2016 |
| Mili Eiendom AS | Real estate | 2021 |
| Mitek Holding II AS | Construction | 2023 |
| Moen Veg Og Anlegg AS | Construction | 2014 |
| Mt-Anlegg AS | Construction | 2025 |