| GT Alpin Holding AS | Real estate | 2016 |
| GT Fastigheter AS | Real estate | 2015 |
| Gullsmed K E Sando AS | Wholesale & retail | 1969 |
| GVR AS | Administrative & support | 2013 |
| H Bygg Og Vedlikehold AS | Construction | 2025 |
| Hai Gao Hotell AS | Hospitality | 2008 |
| Hailei Eiendom AS | Real estate | 2003 |
| Hans Krosskei AS | Construction | 1965 |
| Hardangervidda Nasjonalparksenter AS | Real estate | 2000 |
| Harrisdesign Nuf | Manufacturing | 2023 |
| Havn & Strander Da | Construction | 1995 |
| Hima Seafood Rjukan AS | Agriculture & fishing | 2015 |
| Hjerdalen Veglag SA | Real estate | 2005 |
| HK Eiendom Rjukan AS | Wholesale & retail | 2018 |
| Hovde Capital AS | Wholesale & retail | 2020 |
| Hovdestaul Eiendom AS | Real estate | 2025 |
| Husvollåe Kraft AS | Energy | 2020 |
| Hårgalleriet Rjukan AS | Other services | 2011 |
| Ifocus AS | Real estate | 2020 |
| Ingolfsland Næring AS | Agriculture & fishing | 2023 |
| Inva Invest AS | | 2024 |
| Jacobsen Holding AS | Hospitality | 1984 |
| Jan Stenersen Transport AS | Water & waste | 1998 |
| Jesh Invest AS | Real estate | 2010 |
| Junes Rjukan AS | Wholesale & retail | 2023 |
| Jungle Sports Avd Rjukan AS | Wholesale & retail | 2022 |
| Jureova Og Valko Gaustaservice Ans | Administrative & support | 2013 |
| Kai Kaasa Transport AS | Transport & logistics | 2019 |
| Kendo Holding AS | | 2015 |
| KK Eiendomsdrift AS | Real estate | 2024 |
| Klimafag AS | Construction | 2013 |
| Kongsberg Bolig AS | Real estate | 2006 |
| Krimsc Invest AS | | 2025 |
| Krossobanen AS | Transport & logistics | 1990 |
| Kvitå Eiendom AS | Real estate | 2005 |
| Kvitåvatn Fjellhytter AS | Real estate | 1996 |
| Kvitåvatn Fjellstoge Nuf | Hospitality | 1995 |
| Kvitåvatn Langrenns- Og Aktivitetsarena AS | Arts & recreation | 2015 |
| Kvitåvatn Tomteservice AS | Construction | 2016 |
| La Lingib AS | Real estate | 2012 |
| La Manga Properties AS | Information & communication | 2007 |
| Levo Eiendom AS | Real estate | 1997 |
| Levo Maskin Og Mekanikk AS | Manufacturing | 1987 |
| Light Health AS | Health & social care | 2026 |
| Lijoski AS | Real estate | 2022 |
| Løitegaard Eiendom AS | Real estate | 1986 |
| Løitegaard Euro Sko AS | Wholesale & retail | 1997 |
| M Øverland Holding AS | | 2025 |
| Maana Eiendom AS | Real estate | 2008 |
| Mathuset Eyde AS | Manufacturing | 2001 |
| Mehlum Eiendom AS | Health & social care | 1993 |
| Meierigården AS | Real estate | 1993 |
| Melkekannen Fjellhytter AS | Hospitality | 2024 |
| Mestercamp AS | Construction | 2025 |
| Mexxla AS | Professional & scientific | 1990 |
| Mias Gruppen AS | Wholesale & retail | 1996 |
| Mias Holding AS | Real estate | 1996 |
| Michaelangelo Eiendominvest AS | Real estate | 2024 |
| Mogen Holding AS | Real estate | 2015 |
| Mogen Invest AS | | 2020 |
| Måna Utmarkslag SA | Arts & recreation | 1977 |
| Nettorør AS | Construction | 2016 |
| Nilssen Transport AS | Transport & logistics | 1999 |
| Nmedia AS | Other services | 2019 |
| Nordic Trading Ans | Wholesale & retail | 1999 |
| Norspaces AS | | 2022 |
| Nouryon Pulp and Performance Chemicals AB | Wholesale & retail | 1995 |
| Nouryon Pulp and Performance Chemicals Norway AS | Manufacturing | 1992 |
| Nye Apo Holding AS | | 2026 |
| Nørstebø Holding AS | Wholesale & retail | 2018 |
| Odd Fellow Huset AS | Real estate | 1987 |
| Onklsam AS | Hospitality | 2023 |
| Ops Hunderehab AS | Other services | 2019 |
| Pagi AS | Professional & scientific | 2012 |
| Perak AS | Professional & scientific | 2017 |
| Pizzamannen AS | Hospitality | 2024 |
| PMC Industriservice AS | Manufacturing | 2016 |
| Pote Hundesalong AS | Other services | 2016 |
| Power Rjukan AS | Wholesale & retail | 2025 |
| Prosjekt Og Markedsutvikling Norge AS | Real estate | 2015 |
| R-Te AS | Real estate | 2006 |
| Raanes Invest AS | | 2025 |
| Raanes Transport AS | Transport & logistics | 2023 |
| Radio Rjukan AS | Information & communication | 2002 |
| Rayonex Biomedical Norway AS | Wholesale & retail | 2016 |
| Rendez-Vous Frankrike AS | Administrative & support | 2011 |
| Rjukan Arbeiderblad AS | Information & communication | 1989 |
| Rjukan Begravelsesbyrå AS | Other services | 2012 |
| Rjukan Betong AS | Manufacturing | 2015 |
| Rjukan Bil AS | Other services | 1996 |
| Rjukan Bingo AS | Arts & recreation | 2013 |
| Rjukan by AS | Professional & scientific | 2022 |
| Rjukan Bygg AS | Real estate | 1981 |
| Rjukan Fjellstue AS | Hospitality | 2021 |
| Rjukan Hotell AS | Hospitality | 2021 |
| Rjukan Hytteby AS | Hospitality | 1986 |
| Rjukan Interiørsenter AS | Wholesale & retail | 1986 |
| Rjukan Kinokafe AS | Hospitality | 2025 |
| Rjukan Klatrepark AS | Arts & recreation | 2017 |
| Rjukan Metall Holding AS | Real estate | 1996 |