| Hallingdal Næringseiendom AS | Real estate | 2017 |
| Hallingdal Næringsinvest AS | Real estate | 2025 |
| Hallingdal Og Valdres Eiendomstaksering AS | Real estate | 1999 |
| Hallingdal Peis Og Pipe AS | Construction | 2025 |
| Hallingdal Renhold Service Da | Administrative & support | 2002 |
| Hallingdal Rental Hub AS | Real estate | 2022 |
| Hallingdal Retail AS | Wholesale & retail | 2006 |
| Hallingdal Småmat Da | Manufacturing | 2009 |
| Hallingdal Tjenester AS | Administrative & support | 2019 |
| Hallingdal Tomteutvikling AS | Real estate | 2011 |
| Hallingdal Trafikkopplæring AS | Education | 2015 |
| Hallingdal Trykk AS | Manufacturing | 1993 |
| Hallingdal Tungbilberging AS | Transport & logistics | 2012 |
| Hallingdal Økonomiservice AS | Professional & scientific | 1998 |
| Hallingkost SA | Wholesale & retail | 2002 |
| Hallinglaft AS | Construction | 2015 |
| Hallingmegleren AS | Real estate | 2020 |
| Hallingparken AS | Hospitality | 1981 |
| Hallingstad Elektro AS | Construction | 2022 |
| Hallingterminalen AS | Real estate | 2012 |
| Haugstad Holding AS | Construction | 2005 |
| Haugstad Invest AS | Construction | 2005 |
| Haugstad Og Møllerplass Eiendom AS | Real estate | 2002 |
| Haugstad Og Roe Eiendom AS | Real estate | 1991 |
| Haugstad Transport AS | Transport & logistics | 2014 |
| Hbbe AS | Real estate | 2026 |
| Heas Eiendom AS | Real estate | 2007 |
| Heddevegen Veglag SA | Real estate | 1978 |
| Helene Rustberggard AS | Real estate | 2018 |
| Helge Bakken AS | Transport & logistics | 2001 |
| Hemsedal Golfalpin Golfbane AS | Arts & recreation | 1997 |
| Hemsedal Hyttetomter AS | Real estate | 2008 |
| Hemsedal Næringseiendom AS | Real estate | 2020 |
| Herad Kraft Da | Energy | 2006 |
| Herad Samdrift Da | Agriculture & fishing | 2008 |
| Hero Hallingdal AS | Real estate | 2005 |
| Hesla Eiendom AS | Real estate | 1999 |
| Hestehaugane AS | Real estate | 2021 |
| HG Holding AS | Financial services | 2005 |
| Hih AS | Real estate | 2018 |
| Hoftun AS | | 2025 |
| Hoftun Eiendom AS | Real estate | 1992 |
| Hoftun Holding AS | Wholesale & retail | 2005 |
| Hoftun Jaktfelt SA | Arts & recreation | 1995 |
| Hoftun Utvikling AS | Real estate | 2014 |
| Hogstservice Da | Agriculture & fishing | 1998 |
| Holleviken AS | Construction | 2017 |
| Honningkrukka AS | Information & communication | 2000 |
| Hornet Auto AS | Wholesale & retail | 2020 |
| Hosjosefine AS | Wholesale & retail | 2000 |
| HR Samdrift Da | Agriculture & fishing | 2018 |
| HRR Holding AS | Financial services | 2017 |
| HSV Byggservice AS | Construction | 2019 |
| HSV Eiendom AS | Real estate | 2006 |
| Husfliden Hallingdal AS | Wholesale & retail | 1936 |
| Husøynvegen 11 AS | Real estate | 2014 |
| Husøynvegen 3 AS | Real estate | 2022 |
| HYTTEBYGG123 Nuf | Construction | 2022 |
| Hytteutvikleren AS | Real estate | 2021 |
| Håndverkhuset Hallingdal Skilt & Skifer AS | Real estate | 2021 |
| Hårstua Frisører AS | Other services | 2000 |
| Høgebakken AS | Real estate | 2005 |
| Høgsyn AS | Real estate | 2020 |
| Høvda Invest AS | | 2025 |
| Høvresli Viltforvaltning SA | Arts & recreation | 2021 |
| Høyne Holding AS | | 2023 |
| Iadventure AS | Professional & scientific | 2017 |
| Icedrive AS | Arts & recreation | 2022 |
| Ildstedet Hallingdal AS | Wholesale & retail | 2021 |
| Interiørsenteret AS | Wholesale & retail | 1998 |
| Intersport Gol AS | Wholesale & retail | 2015 |
| Investorteam AS | | 2020 |
| Isbanedrift AS | Arts & recreation | 2014 |
| J.M. Holding AS | Real estate | 2015 |
| Jacobsen Utleie Og Tjenester AS | Construction | 2025 |
| Jafs Kro Gol AS | Hospitality | 2014 |
| Jamo AS | Financial services | 1974 |
| Jan Olav Bjerke AS | Construction | 1994 |
| Jorde Bygg & Maskin AS | Real estate | 2020 |
| Jorde Eiendomsinnvestering AS | Real estate | 2025 |
| Jåddelle AS | | 2023 |
| K.A.T Holding AS | Construction | 2024 |
| Kai Hansen Holding AS | Manufacturing | 2008 |
| Kamben Hytteutleie AS | Real estate | 2005 |
| Kamben Høyfjellshotell AS | Hospitality | 1991 |
| Kampari AS | Real estate | 2005 |
| Kaparviki Holding AS | Construction | 2019 |
| Kapos Invest AS | | 2005 |
| Kasper Eiendom AS | Real estate | 2012 |
| Kasper Holding AS | Real estate | 2010 |
| Kattenberg Fysioterapi AS | Health & social care | 2013 |
| Khalles Corner Gol AS | Hospitality | 2016 |
| Kinneberg AS | Real estate | 2025 |
| Kinneberg Bygg Og Brannsikring AS | Construction | 2000 |
| Kinneberg Eiendom AS | Real estate | 2020 |
| Kinnebergskog Ans | Agriculture & fishing | 2005 |
| Kjell P. Nibstad Da | Real estate | 2005 |
| Kjersti's Mat Og Vinhus AS | Manufacturing | 2014 |
| Kjetil Jegleim AS | Water & waste | 2008 |
| Klemmavegen 10 AS | Real estate | 2005 |