| Hansco Invest AS | Financial services | 2005 |
| Hanske-Companiet AS | Wholesale & retail | 1982 |
| Hartmark Invest AS | | 2025 |
| Has Investeringer AS | | 2005 |
| Haugan Gruppen AS | Real estate | 2018 |
| Haveråsen Vann Og Avløpslag SA | Water & waste | 2014 |
| Hebeni AS | | 2021 |
| Heel AS | | 2021 |
| Heer Antennelag SA | Information & communication | 1972 |
| Heer Frisør AS | Other services | 1986 |
| Heer Grendehus Naturbarnehage SA | Education | 1989 |
| Heer Grendehus SA | Real estate | 1980 |
| Hegn AS | Manufacturing | 2023 |
| Hei Sveis AS | Other services | 1998 |
| Heim Boligstyling AS | Professional & scientific | 2016 |
| Heimtun Holding AS | | 2025 |
| Heitmann Marin AS | Wholesale & retail | 1984 |
| Hel Ved Design AS | Wholesale & retail | 2018 |
| Hellem Medical AS | | 2023 |
| Hellesøe Handel AS | Real estate | 2010 |
| Hellstrøms Maling Og Oppussing AS | Construction | 2025 |
| Helsekonsulenten K & L Tomter Ans | Administrative & support | 1990 |
| Hema Invest Holding AS | Wholesale & retail | 2013 |
| Hemos AS | Wholesale & retail | 2016 |
| Hendrix Consult AS | Arts & recreation | 2024 |
| Hendrix Invest AS | Arts & recreation | 2023 |
| Hennie Invest AS | Real estate | 2021 |
| Henrik Bjørnstad AS | Arts & recreation | 2018 |
| Hersleth Invest AS | Construction | 2017 |
| Hest, Hund Og Helse AS | Other services | 2021 |
| Hestehagen 2 AS | Wholesale & retail | 2012 |
| Hestehagen 4 AS | Real estate | 1993 |
| Hestehagen 5 AS | Real estate | 2014 |
| Hestehagen 6 AS | Real estate | 2006 |
| Hestehagen Invest AS | Real estate | 2021 |
| Hestra Innredninger AS | Wholesale & retail | 1984 |
| Hestra Inredninger AB Filial I Norge | Construction | 2008 |
| HF1 Holding AS | Financial services | 2011 |
| HG Auto AS | Wholesale & retail | 2015 |
| HGP Produkter AS | Manufacturing | 2013 |
| Hhweb AS | Financial services | 2018 |
| Hiemeyer Ans | Professional & scientific | 1990 |
| Hilde Ullevoldsæter AS | Wholesale & retail | 2016 |
| Hindsight Holding AS | | 2024 |
| HIROH BILVERKSTED ANS Hindbjørgmo & Hindbjørgmo | Real estate | 1968 |
| Hiroh Bilverksted AS | Other services | 2017 |
| Hirsti Invest AS | Real estate | 2007 |
| Hjerteslag AS | Education | 2020 |
| HK Raanaas AS | Administrative & support | 2015 |
| HLR Invest AS | Real estate | 2007 |
| Hobbyteknikk SA | Wholesale & retail | 2009 |
| Hold På Hatten AS | | 2022 |
| Holmberg Invest AS | Manufacturing | 2023 |
| Holnor Auto AS | Wholesale & retail | 2012 |
| Holnor Da | Transport & logistics | 2008 |
| Holtech AS | Information & communication | 2026 |
| Holter Deponi Eiendom AS | Real estate | 2025 |
| Holter Nord AS | Real estate | 2018 |
| Holter Næringsbygg AS | Real estate | 2022 |
| Holterkollen Holding AS | Wholesale & retail | 2018 |
| Holterkollveien 2 AS | Real estate | 2011 |
| Holterkollveien 5 AS | Real estate | 2024 |
| Holterveien 2 a AS | Real estate | 2021 |
| Holtet Nyveien 24 AS | Real estate | 2011 |
| Horgen Miljøpark AS | Water & waste | 2023 |
| Horizon Ventures AS | Information & communication | 2025 |
| Hospitality and Retail Systems AS | Wholesale & retail | 2018 |
| Hove Software AS | Information & communication | 1998 |
| HPK AS | Professional & scientific | 2021 |
| Hri AS | Real estate | 2011 |
| Hughson Holding AS | | 2026 |
| Human Era AS | Information & communication | 2026 |
| HVF Invest AS | Financial services | 2012 |
| Hydroteknikk AS | Wholesale & retail | 2025 |
| Håndverker Ulf Eriksen AS | Construction | 2016 |
| Høfingernes AS | Real estate | 2005 |
| Høiberget Holding AS | Real estate | 1989 |
| Høibraaten Båtservice AS | Manufacturing | 2004 |
| Høstlund Invest AS | Real estate | 2016 |
| I-Ressurs AS | Professional & scientific | 2010 |
| Ide Eiendom AS | Wholesale & retail | 1998 |
| Ide House of Brands AS | Wholesale & retail | 1987 |
| Idso Invest AS | | 2020 |
| Idé Group AS | Wholesale & retail | 2020 |
| Idé Product Media AS | | 2025 |
| Ihlebæk Eiendom AS | Real estate | 2024 |
| Ile Invest AS | | 2019 |
| Ilios Kommunikasjon AS | Professional & scientific | 1986 |
| Ilje AS | | 2005 |
| Ilmo Optikk AS | Wholesale & retail | 1990 |
| Imemi Agenturer AS | Wholesale & retail | 2018 |
| Impregnert AS | | 2005 |
| Indikon AS | Administrative & support | 2026 |
| Individual Health Systems AS | Information & communication | 2015 |
| Indre Hallangspollen Vann- Og Avløpslag SA | Water & waste | 2007 |
| Ingeniør Og Takstmann Thomas a. Haugan AS | Real estate | 2011 |
| Innovasjonsbygg AS | Construction | 1986 |
| Inocurea AS | Health & social care | 2008 |
| Interiørhelhet AS | Professional & scientific | 2013 |
| International Consulting Management AS | Professional & scientific | 1984 |