| Hotel Co 51 Norway AS | Hospitality | 2020 |
| Hotelldrift Hellerudsletta AS | Hospitality | 2023 |
| HP Eiendom Holding AS | Real estate | 2009 |
| HR Capital AS | Real estate | 2021 |
| Hruby Budtjenester AS | Transport & logistics | 2023 |
| Hugo Klopp AS | | 2022 |
| Hurtig-Gutta Holding AS | Transport & logistics | 2012 |
| Hurtig-Gutta Transport AS | Transport & logistics | 2013 |
| Hus Og Gårdservice AS | Construction | 2013 |
| Hussain Eiendoms Invest AS | Real estate | 2026 |
| Hussain Health Invest AS | Real estate | 2021 |
| Hussain Invest AS | | 2026 |
| Huus AS | Real estate | 2002 |
| Hvamstubben 20 AS | Real estate | 1972 |
| Hvamsvingen 22 AS | Real estate | 1996 |
| Hvamsvingen 26 AS | Real estate | 2007 |
| Hvamsvingen 4 Ans | Real estate | 1990 |
| Hvamsvingen 4 AS | Real estate | 2004 |
| Hydex Semitronic AS | Wholesale & retail | 2008 |
| Hydex Sylinderteknikk AS | Wholesale & retail | 1994 |
| Hydex Systemhydraulikk AS | Wholesale & retail | 1988 |
| Hydra Pipe Øst AS | Wholesale & retail | 2016 |
| Hydraulikkteknikk AS | Wholesale & retail | 2003 |
| Håndverksgruppen Regnskap Og Lønn Oslo AS | Construction | 2010 |
| Iaa Eiendom AS | Real estate | 2022 |
| Idun Industri AS | Manufacturing | 1990 |
| Ik Bistand AS | Professional & scientific | 2017 |
| Il Segno AS | Financial services | 2014 |
| Ila Alle 74 AS | Real estate | 2007 |
| Indigo Media AS | Information & communication | 2021 |
| Industriveien 21 AS | Real estate | 2021 |
| Insta Trafikkskole AS | Education | 2023 |
| International Bygg Og Sveis Ans | Manufacturing | 1988 |
| IP Kameratene AS | Wholesale & retail | 2010 |
| Isakveien 2 AS | Real estate | 2010 |
| Itsup Da | Information & communication | 2002 |
| J Bryhn Consult Ans | Construction | 2025 |
| J.L Holding AS | | 2021 |
| J.O Bårdevik Holding AS | | 2024 |
| Ja Prosjekt AS | Real estate | 2015 |
| Jan Grosch AS | Professional & scientific | 1963 |
| Jan Olav Martinsen Holding AS | Manufacturing | 2005 |
| Jas Konsult AS | Professional & scientific | 2018 |
| JHB Hus Og Hytter AS | Administrative & support | 2018 |
| JHS Invest AS | | 2020 |
| Job Gruppen AS | | 2021 |
| Jon a Syversen Holding AS | Professional & scientific | 2005 |
| Jonanor AS | | 2021 |
| Josv Holding AS | | 2005 |
| Juliusson Consulting AS | Professional & scientific | 2015 |
| Just Padel X AS | Arts & recreation | 2020 |
| K Transport AS | Transport & logistics | 2017 |
| K. Nilsen Holding AS | | 2024 |
| Karlsen VVS AS | Construction | 2011 |
| Kewe Invest AS | Financial services | 2014 |
| Kime Forvaltning AS | | 2025 |
| Kingbee AS | Financial services | 2018 |
| Kinowski Holding AS | Construction | 2019 |
| Kiær Invest AS | Information & communication | 2014 |
| Kjeller Vest 12 AS | Real estate | 2015 |
| Klatre Digital AS | Information & communication | 2017 |
| Klefos AS | Professional & scientific | 2012 |
| KM Agency AS | Administrative & support | 2024 |
| KMM Smart AS | | 2025 |
| Koasito AS | Financial services | 2006 |
| Korek Eiendom AS | Administrative & support | 2019 |
| Korneliussen Eiendomsutvikling AS | Real estate | 2004 |
| Kragerud Barnehage AS | Education | 2007 |
| Ksu Holding AS | | 2018 |
| KTR Systems Norge AS | Wholesale & retail | 1998 |
| Korrosjons-Teknikk AS | Wholesale & retail | 1987 |
| L5 International AS | Wholesale & retail | 2017 |
| Lahaug Gårds- Og Naturbarnehage AS | Education | 2002 |
| Lahaug Og Tjade AS | Construction | 2017 |
| Lahaugmoveien 54 AS | Real estate | 2014 |
| Lahaugmoveien 81 AS | Real estate | 2007 |
| Lampan Sweden AB Nuf | Wholesale & retail | 2025 |
| Landrø Eiendom AS | Real estate | 1982 |
| Landrø Holding AS | Wholesale & retail | 1992 |
| Lars E. Strand Malermester Og Entreprenørforretning AS | Construction | 2019 |
| Lasteteknikk AS | Other services | 2024 |
| Leke Palass Ans | | 1988 |
| Lerbi Invest AS | Financial services | 2013 |
| Lerstadveien 510 AS | Real estate | 2007 |
| Lillestrøm Klinikken AS | Health & social care | 2022 |
| Lina Transport AS | Transport & logistics | 2007 |
| Link Transport AS | Transport & logistics | 2022 |
| Lobaso Holding AS | | 2021 |
| Losbyveien Terrasse AS | Real estate | 1993 |
| Lumon Norge AS | Construction | 2000 |
| Lunna Eiendom AS | Real estate | 1999 |
| Luxuryfit AS | Professional & scientific | 2016 |
| Lyra Holding AS | | 2024 |
| Løvehjerte Fus Barnehage AS | Education | 2002 |
| M Sørlie Holding AS | | 2025 |
| M.T.A Holding AS | | 2023 |
| Macarena AS | Construction | 2014 |
| Magne Landrø AS | Wholesale & retail | 1992 |
| Malermester Buer AS | Construction | 1970 |
| Maria Maria AS | Real estate | 2025 |