| Fosse Eiendom AS | Real estate | 2000 |
| Frøya Productions Da | Information & communication | 2022 |
| Fysst AS | Construction | 2021 |
| Fødalsdrifta Beitelag SA | Agriculture & fishing | 1960 |
| G-Prosjekt AS | | 2010 |
| Geilograna Da | Wholesale & retail | 2013 |
| Gerds Frisør Ans | Other services | 1995 |
| Glimre AS | Construction | 2019 |
| GR Bygg AS | Construction | 2012 |
| Granheim Invest AS | Professional & scientific | 2017 |
| Granheim Norge AS | Wholesale & retail | 2026 |
| Grevlunda AS | Professional & scientific | 2023 |
| GRM Invest AS | Real estate | 1969 |
| Grøthe Holding AS | Real estate | 2005 |
| GS Invest Holding AS | | 2025 |
| Gs-Elektro AS | Construction | 2023 |
| Gswb Eiendom AS | Real estate | 2025 |
| Gswb Holding AS | Construction | 2025 |
| GT Data Regnskap AS | Professional & scientific | 2013 |
| Gudbrandsgard AS | Construction | 2005 |
| Gudbrandsgard Maskin AS | Construction | 2016 |
| Gullhagen Anleggsdrift AS | Construction | 2005 |
| Gullsmed Brusletto & Kjerland Da | Wholesale & retail | 1991 |
| H-Fire AS | | 2026 |
| Hagaskogen Da | Agriculture & fishing | 2007 |
| Hagen Elektro AS | Construction | 1998 |
| Hallgrim Holding AS | Information & communication | 2022 |
| Hallingauksjon AS | Wholesale & retail | 2018 |
| Hallingbarna AS | Wholesale & retail | 2022 |
| Hallingdal & Ringerike Skadedyrkontroll AS | Administrative & support | 2013 |
| Hallingdal Bergboring AS | Mining & quarrying | 2025 |
| Hallingdal Bilvask AS | Other services | 2025 |
| Hallingdal Blikk Og Tak AS | Construction | 2021 |
| Hallingdal Brønn Og Graveservice AS | Construction | 2006 |
| Hallingdal Butikkdrift AS | Wholesale & retail | 2021 |
| Hallingdal Fjellservice AS | Administrative & support | 2012 |
| Hallingdal Flisterminal AS | Manufacturing | 2023 |
| Hallingdal Hus Og Hytter Da | Real estate | 2010 |
| Hallingdal Innkjøp AS | Wholesale & retail | 2002 |
| Hallingdal Kontorsenter AS | Wholesale & retail | 1986 |
| Hallingdal Lyd AS | Arts & recreation | 2026 |
| Hallingdal Lyd Holding AS | | 2026 |
| Hallingdal Motor Og Fritid AS | Wholesale & retail | 2012 |
| Hallingdal Pukk Og Grus AS | Mining & quarrying | 2017 |
| Hallingdal Selvvask AS | Other services | 2025 |
| Hallingdal Trepellets AS | Manufacturing | 2004 |
| Hallingdølen AS | Information & communication | 1972 |
| Hallingfisk AS | Agriculture & fishing | 2001 |
| Hallingmøbler Hyttesenter AS | Real estate | 1971 |
| Hallingplast AS | Manufacturing | 1977 |
| Hallingsag AS | Manufacturing | 2003 |
| Hallingsveis AS | Construction | 2025 |
| Hallvard Søndrål AS | Wholesale & retail | 2014 |
| Halstensgård Holding AS | | 2023 |
| Hasa AS | Construction | 1990 |
| Hatlehiet AS | Manufacturing | 2014 |
| Haug TV Og Videoproduksjon AS | Information & communication | 2022 |
| Haugen Tomtefelt AS | Real estate | 2013 |
| Havingand Holding AS | Wholesale & retail | 2022 |
| Hdalen Holding AS | Construction | 2025 |
| Hebo Invest AS | Financial services | 2009 |
| Hedelund Holding AS | | 2023 |
| Hefte Bygg Og Laft AS | Construction | 2025 |
| Heime Med Hund AS | Arts & recreation | 2012 |
| Heldiggrisen Da | Agriculture & fishing | 2017 |
| Helediki AS | Financial services | 2017 |
| Helge Skrindo-Tveito AS | Construction | 2022 |
| Hellbillies AS | Arts & recreation | 2014 |
| Hendug Bygg AS | Construction | 1987 |
| Herje Musikk AS | Real estate | 2020 |
| Hicom AS | Construction | 2018 |
| Hillamoi AS | Wholesale & retail | 2022 |
| Hillbilly MTB AS | Arts & recreation | 2014 |
| Hjemtec AS | | 2025 |
| HM Tremiljø AS | Construction | 2025 |
| Holmevassnatten Hyttegrend AS | Real estate | 2026 |
| Holo Drift AS | Real estate | 2015 |
| Hovdegard Eiendom AS | Real estate | 2022 |
| Hovdegard Invest AS | | 2025 |
| HS Næringseiendom AS | Real estate | 2018 |
| HTH Hyttetjenester Ans | Other services | 2000 |
| Ingar Dalen AS | Real estate | 2002 |
| Installasjon Invest AS | Real estate | 1987 |
| Inter Frisør Ans | Other services | 1992 |
| Intersport Ål AS | Wholesale & retail | 2011 |
| Intersport Ålingen Ans | Wholesale & retail | 1987 |
| Isobygg Hallingdal AS | Construction | 2023 |
| Iungsdalen DNT AS | Hospitality | 2017 |
| Ivar Espegard AS | Construction | 2006 |
| J E Ruud Invest AS | Financial services | 2005 |
| Jaage Holding AS | Information & communication | 2020 |
| Jans Auto Ans | Other services | 2002 |
| Jølstad Hallingdal Gravferdsbyrå AS | Other services | 2017 |
| Jønndalen Fjellservice AS | Administrative & support | 2020 |
| Jørgen Sjølie Holding AS | Construction | 2017 |
| K2 Eiendomsinvest AS | Real estate | 2018 |
| K2 Investering AS | Professional & scientific | 2017 |
| KBS Invest AS | Real estate | 2006 |
| Kim Rudi AS | Manufacturing | 2024 |
| Kim Rudi Butikkdrift AS | Wholesale & retail | 2026 |