| HM 2 Handelseiendom AS | Real estate | 2014 |
| HM 45 Seksjon 10 AS | Real estate | 2026 |
| HM 49 Seksjon 1 AS | Real estate | 2015 |
| Hmholding AS | | 2019 |
| HMP Holding AS | Wholesale & retail | 2024 |
| Hodet Bar Da | Hospitality | 2003 |
| Hoels Auto AS | Other services | 2006 |
| Hofveien 10 AS | Real estate | 2015 |
| Hokksund Butikkeiendom AS | Real estate | 2015 |
| Holdingco AS | Real estate | 2022 |
| Hole Caravan AS | Wholesale & retail | 2011 |
| Hole Eiendomservice AS | Real estate | 2023 |
| Hole Utmarkslag SA | Arts & recreation | 1952 |
| Hole-Ødegarden Holding AS | | 2026 |
| Holmby Invest AS | Real estate | 2024 |
| Holmestrand Butikkeiendom AS | Real estate | 2010 |
| Holth Holding AS | | 2025 |
| Holth Prosjekt AS | Real estate | 2017 |
| Holth Rep. & Metall AS | Manufacturing | 2012 |
| Holthe AS | Real estate | 2018 |
| Holths Bygg Og Eiendom AS | Real estate | 2010 |
| Horgen Design AS | Wholesale & retail | 2006 |
| Hos Tove AS | Wholesale & retail | 2014 |
| Hotell Service AS | Real estate | 1991 |
| Hoth AS | Wholesale & retail | 2018 |
| Hov Barnehage SA | Education | 1997 |
| Hov Næring AS | Real estate | 2005 |
| Hov Sør AS | Real estate | 2010 |
| HR Companies AS | Education | 2017 |
| Hro AS | Construction | 2023 |
| Hro Servicesystemer AS | Wholesale & retail | 2006 |
| HT Severin AS | | 2021 |
| Huber Technology Nordic AB Nuf | Wholesale & retail | 1999 |
| Hues AS | Real estate | 2020 |
| Huhtamaki Foodservice Nordic OY, Norway Branch Nuf | Wholesale & retail | 2016 |
| Huhtamaki Norway AS | Wholesale & retail | 1983 |
| Huhtamaki Norway Holdings AS | Wholesale & retail | 1990 |
| Humanfuel AS | Wholesale & retail | 2026 |
| Humbar AS | Hospitality | 2019 |
| Hundeide Maskinutleie AS | Administrative & support | 2025 |
| Hundsem Invest AS | Financial services | 2005 |
| Husdrømmen AS | Construction | 2014 |
| Huser Eiendom AS | Real estate | 2021 |
| Husihellas.No AS | Real estate | 1986 |
| Husums Holding AS | | 2020 |
| Hvalheim Eiendom AS | Real estate | 1996 |
| Hvalsbruveien 4 AS | Real estate | 2025 |
| Hvalsengen Invest AS | Financial services | 2005 |
| Hvalsmoen AS | Real estate | 2005 |
| Hvamb AS | Professional & scientific | 2020 |
| Hverven Atrium AS | Real estate | 2016 |
| Hverven Revisjon AS | Professional & scientific | 1997 |
| Hvervenmoveien 11 AS | Real estate | 2021 |
| Hvervenmoveien 15 AS | Real estate | 2013 |
| Hvervenmoveien 25 AS | Real estate | 2013 |
| Hvervenmoveien 37 AS | Real estate | 2014 |
| Hvervenmoveien 45 AS | Real estate | 2025 |
| Hvervenmoveien 60 AS | Real estate | 2014 |
| Hvervenmoveien Eiendom X AS | Real estate | 2011 |
| Hvervenmoveien Eiendom Xi AS | Real estate | 2011 |
| Hverventunet Service AS | Real estate | 2012 |
| HVH Service AS | Construction | 2013 |
| Hvitt & Grønt AS | Administrative & support | 2025 |
| Hwa Rang Sports - Cho Fecadu Ans | Wholesale & retail | 1989 |
| Hygge Hønefoss AS | Hospitality | 2025 |
| Hymec AS | Wholesale & retail | 2005 |
| Høe-Mayer Holding AS | Real estate | 2016 |
| Høgni Kompetanse Arason | Education | 2013 |
| Høgåsveien 3 AS | Real estate | 2020 |
| Høn AS | | 2026 |
| Hønefoss Arena AS | Arts & recreation | 2013 |
| Hønefoss Auto AS | Other services | 2020 |
| Hønefoss Auto Care AS | Other services | 2026 |
| Hønefoss Autocenter AS | Other services | 2021 |
| Hønefoss Bil AS | Wholesale & retail | 1997 |
| Hønefoss Bokstue AS | Wholesale & retail | 2025 |
| Hønefoss Bowlingsenter AS | Arts & recreation | 2003 |
| Hønefoss Brug AS | Real estate | 1987 |
| Hønefoss by AS | Administrative & support | 2022 |
| Hønefoss by Online AS | Information & communication | 2021 |
| Hønefoss Bygg AS | Construction | 2010 |
| Hønefoss Bygg Og Våtrom AS | Construction | 2019 |
| Hønefoss Dykkersenter AS | Education | 2022 |
| Hønefoss Eiendom AS | Real estate | 2015 |
| Hønefoss Elektro AS | Construction | 2012 |
| Hønefoss Frisør AS | Other services | 2025 |
| HØNEFOSS GJESTESTUER T Holm og G Andersen ANS | | 1989 |
| Hønefoss Glass - Service AS | Construction | 2006 |
| Hønefoss Golfsenter AS | Arts & recreation | 2023 |
| Hønefoss Hotelldrift AS | Hospitality | 2017 |
| Hønefoss Hudlegekontor AS | Health & social care | 2019 |
| Hønefoss Hudpleie AS | Other services | 2016 |
| Hønefoss Invest Og Eiendom AS | Real estate | 2014 |
| Hønefoss Kiosk AS | Wholesale & retail | 2025 |
| Hønefoss Kjøleservice AS | Construction | 2026 |
| Hønefoss Krom & Nikkel A/S | Manufacturing | 1987 |
| Hønefoss Lyd AS | Arts & recreation | 2011 |
| Hønefoss Lyd Og Lys Ivan Skogheim Og Morten Bjåland Ans | Wholesale & retail | 1989 |
| Hønefoss Marked AS | Wholesale & retail | 2023 |
| Hønefoss Maskin AS | Wholesale & retail | 1985 |