| Hevi Tech AS | Manufacturing | 2021 |
| Hevingen AS | Real estate | 2019 |
| Hevingen Næringspark AS | Real estate | 2022 |
| Hoka Bygg AS | Construction | 2025 |
| Holmberg Og Eide AS | Construction | 2015 |
| Holmen Vann Og Avløp Drift SA | Water & waste | 2009 |
| Holteskogen Eiendom AS | Real estate | 2016 |
| Holteskogen Næringsbygg AS | | 2026 |
| HP Facilitytec Da | Construction | 2009 |
| HSP Inspection AS | Professional & scientific | 2011 |
| Hus & Bad AS | Construction | 2026 |
| Hval Holding AS | Wholesale & retail | 2020 |
| Hydrotech Asia Ltd | Professional & scientific | 2012 |
| Hykkelen Og Grønsund Vannlag SA | Water & waste | 2009 |
| Häger Holding AS | | 2021 |
| Hågensen Maritime AS | Professional & scientific | 2019 |
| Hårfin Sarpsborg AS | Other services | 2020 |
| Høydahl Holding AS | Wholesale & retail | 2022 |
| I Ø Landbrukservice AS | Wholesale & retail | 1985 |
| I-Pack AS | Manufacturing | 1997 |
| Idekompaniet AS | Professional & scientific | 1999 |
| Illebra Eiendom AS | Real estate | 2023 |
| Imb Invest AS | Financial services | 2015 |
| Info-Vekst AS | Professional & scientific | 2014 |
| Ingeniørfirmaet Svendsen & Co AS | Professional & scientific | 1995 |
| Inter City Transport AS | Transport & logistics | 1991 |
| Invest CK Da | Information & communication | 2015 |
| Iren Brenne AS | Financial services | 2005 |
| Iseveien Eiendom AS | Wholesale & retail | 2001 |
| Iseveien Optikk AS | Wholesale & retail | 2025 |
| Iseveien Services AS | Manufacturing | 2013 |
| Isi Bar AS | Hospitality | 2021 |
| Isnes Montasje Nuf | Construction | 2010 |
| IT Kontroll AS | Information & communication | 2025 |
| J Remme AS | Financial services | 1997 |
| J-P Boligutleie AS | Real estate | 2019 |
| J-P Holding AS | Real estate | 2017 |
| Jalangsholt Invest AS | | 2019 |
| Jansson Holding AS | Real estate | 2022 |
| Jardak Eiendom AS | Real estate | 2021 |
| JCB Hage Og Grøntarealer AS | Administrative & support | 2013 |
| Jefo AS | | 2026 |
| Jehad Timraz Holding AS | | 2021 |
| Jellestadveien 1 Seksjon 2 AS | Real estate | 2022 |
| Jellestadveien 30 AS | Real estate | 2022 |
| Jellestadveien 37 AS | Real estate | 2010 |
| Jellestadveien Eiendom AS | Real estate | 1980 |
| Jesby 2 AS | Professional & scientific | 2005 |
| Jesby AS | Professional & scientific | 2008 |
| JF Solvang AS | Professional & scientific | 2023 |
| Jkholding AS | | 2023 |
| Joad Holding AS | Real estate | 2020 |
| Johan Nordtugsvei 9-11 AS | Real estate | 2019 |
| Jonial AS | Real estate | 2003 |
| Jota AS | Real estate | 2020 |
| JV Anlegg AS | Construction | 2013 |
| JV Eiendom AS | Real estate | 2022 |
| JV Holding AS | Construction | 2022 |
| JV Lagerbygg AS | Real estate | 2023 |
| JV Utvikling AS | Real estate | 2018 |
| JWJ Brann & Sikkerhet AS | Wholesale & retail | 2024 |
| K.M Byggservice. AS | Construction | 2024 |
| Kabuli Catering AS | Hospitality | 2025 |
| Kaca Eiendom AS | Real estate | 2017 |
| Kaca Holding AS | Other services | 2013 |
| Kaca Næringspark AS | Real estate | 2017 |
| Kaca Utvikling AS | Real estate | 2021 |
| Kama Fritid Norge AS | Wholesale & retail | 2014 |
| Kampenes Minilager AS | Real estate | 2013 |
| Kampenesmosen 13 AS | Real estate | 2022 |
| Kanso Sports AS | Wholesale & retail | 2024 |
| Kebabfabrikken Borgen AS | Hospitality | 2023 |
| Kenneth Westli Graving AS | Construction | 2006 |
| Kentn AS | Financial services | 2014 |
| Kingsland AS | Wholesale & retail | 2007 |
| Kingsrent AS | Administrative & support | 2020 |
| Kingsrød AS | Transport & logistics | 2007 |
| Kingsrød Eiendom AS | Transport & logistics | 2012 |
| Kingsrød Holding AS | Real estate | 1987 |
| Kingsrød Lastebil Senter AS | Other services | 1974 |
| Kingsrød Service Partner AS | Professional & scientific | 2012 |
| Kingsrød Transport AS | Transport & logistics | 1971 |
| Kjemihuset AS | Manufacturing | 2015 |
| Klu Invest AS | Real estate | 1975 |
| Kløvningsten 1 AS | Real estate | 2012 |
| Kristoffer BK AS | Professional & scientific | 2023 |
| Kruttrøyk Ans | Wholesale & retail | 2002 |
| Kurefjorden Utbyggingslag SA | Construction | 2018 |
| Kurefjorden Vann- Og Avløpsselskap SA | Water & waste | 2018 |
| Kvinge Invest AS | Wholesale & retail | 2015 |
| Kåre Holt & Co AS | Real estate | 1972 |
| L.Iversen Utleie AS | Administrative & support | 2023 |
| La Scuderia Nuf | Other services | 2009 |
| Laage Holding AS | Real estate | 2005 |
| Lakk-Service AS | Other services | 1990 |
| Lakk-Service Holding AS | Other services | 2005 |
| Lakkservice AS | Other services | 2023 |
| Lande Mek Eiendom AS | Manufacturing | 1982 |
| Lande Mek Verksted AS | Manufacturing | 2001 |
| Langero Invest AS | | 2022 |