| A Gulliksen & Sønn AS | Construction | 2015 |
| Aall Kapital AS | | 2020 |
| Aarsleff Fundamentering & Boring AS | Construction | 2006 |
| Advokatene Bjørbæk AS | Professional & scientific | 2008 |
| Agenda Bygg AS | Real estate | 2018 |
| Agritek AS | Professional & scientific | 2025 |
| Airpower Holding AS | | 2026 |
| Aktiv Lek Og Fritid AS | Manufacturing | 2019 |
| Annes Frisør AS | Other services | 2021 |
| Ans R Stoa & Sønner Renhold | Administrative & support | 1991 |
| Aqvo AS | Construction | 2026 |
| AS Nome Elektro Tele Og Data | Construction | 1999 |
| AS Ulefoss Mekaniske | Manufacturing | 1984 |
| Auto Nome AS | Wholesale & retail | 2020 |
| Baobjerke AS | | 2020 |
| Baroquad AS | Professional & scientific | 2026 |
| Berge Verk AS | Arts & recreation | 2024 |
| Bfive AS | Professional & scientific | 2011 |
| Bia's Blomster AS | Wholesale & retail | 2025 |
| Bjaaland Rui Holding AS | Arts & recreation | 2017 |
| Blink Intelligence AS | Professional & scientific | 2025 |
| Bokholderiet Telemark SA | Administrative & support | 2010 |
| Bre Bygg AS | Construction | 2024 |
| Brennebu AS | Real estate | 2014 |
| Buverud Invest AS | | 2026 |
| Bygg Team Da | Construction | 2001 |
| Cafè Slusa AS | Hospitality | 2014 |
| Cappelen Holding AS | Manufacturing | 2021 |
| CHC Invest AS | Financial services | 2005 |
| Cigill AS | Wholesale & retail | 2011 |
| CK Partners AS | | 2025 |
| Dekoria Skandinavien Nuf | Wholesale & retail | 2011 |
| Dermafin AS | Other services | 2021 |
| DMK Bolig AS | Real estate | 2026 |
| DMK Bygg & Eiendom AS | Construction | 2024 |
| DMK Drift AS | Real estate | 2025 |
| DMK Holding AS | Professional & scientific | 2009 |
| Down Under AS | Professional & scientific | 2020 |
| Dry Works AS | Construction | 2013 |
| Dørhåndverkeren AS | Administrative & support | 2023 |
| E Aarhus AS | Transport & logistics | 2021 |
| Egil Bøe Byggfirma AS | Construction | 1992 |
| Fensenteret - Nasjonalt Kompetansesenter for Kritiske Mineraler AS | Professional & scientific | 2026 |
| Ferro Eiendom AS | Real estate | 2025 |
| Ferro Holding AS | Real estate | 2025 |
| Ferro Stålentreprenør AS | Construction | 2021 |
| Finja AS | Wholesale & retail | 2014 |
| Frode Larsen Holding AS | Manufacturing | 2015 |
| Føre AS | Energy | 2020 |
| Getonnet AS | Information & communication | 2012 |
| Gvarvgata 45 AS | Real estate | 2018 |
| H. Wik Transport AS | Transport & logistics | 2010 |
| Hans G Jørgensen AS | Hospitality | 2016 |
| Hastverket AS | Arts & recreation | 2026 |
| Helgen Maskin AS | Construction | 2023 |
| Herregård AS | Construction | 2002 |
| Holden Capital Holding AS | | 2020 |
| Holla Boligutleie AS | Real estate | 2020 |
| Holla Eiendom | Real estate | 2005 |
| Holla Gård Ans | Agriculture & fishing | 1965 |
| Hpy Holding AS | Real estate | 2024 |
| Høglid Invest AS | Transport & logistics | 2021 |
| Iball AS | Information & communication | 2022 |
| Ilsis AS | | 2021 |
| Ingar Kaasa Invest AS | | 2021 |
| IT Personell Johansen Og Gulliksen Da | Wholesale & retail | 1998 |
| Jabar AS | Construction | 2015 |
| Jegerservice AS | Wholesale & retail | 2011 |
| Jemo Invest AS | Real estate | 2016 |
| Jernbygg AS | Real estate | 1946 |
| JWJ AS | | 2025 |
| Kaasa Consultant Nuf | Real estate | 2008 |
| Kanalen AS | Information & communication | 2000 |
| Kanalen Da | Information & communication | 2001 |
| Knut J Thorstensen AS | Manufacturing | 2023 |
| Kontogaranti AS | Administrative & support | 2012 |
| Korsnes Grønne Fingre AS | Administrative & support | 2025 |
| KTS Ulefoss Eiendom AS | Administrative & support | 2020 |
| Kulturgerilja AS | Professional & scientific | 2025 |
| Kunnskapsparken AS | Real estate | 2018 |
| Landsdal Invest AS | Construction | 2017 |
| Langeland Og Jenssen AS | | 2005 |
| Language Infusion AS | Education | 1996 |
| Lanna Snekkerservice AS | Construction | 2012 |
| Leonardsen Bil AS | Wholesale & retail | 2022 |
| LG Velkom Gård Ans | Agriculture & fishing | 2024 |
| Loadmax AS | Other services | 2026 |
| Løkkabakken Holding AS | Wholesale & retail | 2005 |
| Magnus Wik Transport AS | Transport & logistics | 2025 |
| Malins Frisør AS | Other services | 2016 |
| Micnic Holding AS | | 2026 |
| Midt-Telemark Kraft AS | Energy | 2002 |
| Midt-Telemark Maskinutleie AS | Construction | 2020 |
| Midt-Telemark Rør AS | Construction | 2019 |
| Midt-Telemark Rør Viken AS | Construction | 2020 |
| Moen Gård Ulefoss Da | Agriculture & fishing | 2023 |
| Motherx AS | Information & communication | 2024 |
| MSM Bygg AS | Construction | 2017 |
| Neset's Montasje AS | Construction | 2012 |
| Noka Design AS | Manufacturing | 2004 |