| Illberg Invest AS | Real estate | 2006 |
| Illy Invest AS | Construction | 2014 |
| Imperial Transport AS | Transport & logistics | 2025 |
| Inet Partner AS | Information & communication | 2001 |
| Infocenter AS | Wholesale & retail | 1986 |
| Infoit AS | Information & communication | 2018 |
| Ingoodcompany AS | Arts & recreation | 2024 |
| Innsikta AS | Professional & scientific | 2024 |
| Inotor Nordberg & Co | | 1980 |
| Integer AS | | 2021 |
| Interaktiv Design AS | Professional & scientific | 2013 |
| International Consulting Services AS | Administrative & support | 1994 |
| Inwest Inwest AS | Professional & scientific | 2019 |
| Iqbal Invest AS | Health & social care | 2025 |
| Ir Consult AS | Professional & scientific | 2019 |
| Isafil AS | Health & social care | 2005 |
| Iseco AS | | 2021 |
| Isol AS | Transport & logistics | 2013 |
| J.O Invest AS | | 2026 |
| Jakva AS | Financial services | 2007 |
| Jarholm Eiendom AS | Real estate | 2016 |
| Jarles Holding AS | | 2020 |
| Jarås Holding AS | | 2018 |
| Jasser Eiendom AS | Real estate | 2020 |
| Jasser Invest AS | Real estate | 2017 |
| JB Publishing AS | Information & communication | 2024 |
| Jbo Engineering Group AS | Professional & scientific | 2026 |
| Jegfikkjobben AS | Education | 2016 |
| Jernbaneveien 115 AS | Real estate | 2025 |
| Jessheim Vest Næring AS | Wholesale & retail | 2012 |
| Jet Consulting AS | Professional & scientific | 2016 |
| Jewa AS | Real estate | 2008 |
| JGS AS | | 2022 |
| JJ & MH Holding AS | | 2021 |
| Jobbi AS | Information & communication | 2021 |
| Jon Barstad AS | Professional & scientific | 1995 |
| Jonaz AS | | 2021 |
| K&S Corporation AS | | 2024 |
| K.A.A.N. AS | Professional & scientific | 2026 |
| K23 Eiendom AS | Real estate | 2025 |
| K36 Eiendom AS | Real estate | 2011 |
| Kai Rune Tangen Holding AS | | 2026 |
| Kaizit AS | Information & communication | 2009 |
| Kaki Produkter | | 1985 |
| Kantor Terrasse AS | Construction | 1997 |
| Kantorsenteret Ans | Real estate | 2005 |
| Kapellveien 18 AS | Construction | 1991 |
| Kapellveien 4B AS | Real estate | 2020 |
| Kapellveien Bygg 2 AS | Wholesale & retail | 2009 |
| Kapellveien Bygg AS | Wholesale & retail | 1981 |
| Kapers Ltd Nuf | Information & communication | 2005 |
| Kari Og Terje AS | Real estate | 2005 |
| Kas Transport AS | Transport & logistics | 2022 |
| Kathema AS | Financial services | 2011 |
| Kati AS | Real estate | 2012 |
| Kaze Holding AS | Real estate | 2022 |
| Key Security Norge Da | Wholesale & retail | 2006 |
| KG Eiendomsutvikling AS | Real estate | 2017 |
| KGG Invest AS | Professional & scientific | 2007 |
| Ki-Losen AS | Information & communication | 2026 |
| Kikuten AS | Real estate | 2016 |
| Kikuten Utleie AS | Real estate | 2021 |
| Kile Invest AS | Administrative & support | 2005 |
| Kim's Studio AS | Other services | 2005 |
| Kirsebær AS | Transport & logistics | 2021 |
| Kite Holding AS | Professional & scientific | 2015 |
| KKN Investment AS | Professional & scientific | 2013 |
| Klds Service AS | Education | 2025 |
| Klimakjøling AS | | 2021 |
| Klinikk På Hjul Da | Health & social care | 2025 |
| Klippe AS | | 2023 |
| Kluwi Invest AS | Real estate | 2006 |
| Kløver Invest AS | Wholesale & retail | 1998 |
| Kob Holding AS | Wholesale & retail | 2020 |
| Kobbenestinden AS | Professional & scientific | 2019 |
| Kolben Selskapsmat & Catering AS | Hospitality | 2001 |
| Kolbotn Advokatfellesskap SA | Professional & scientific | 2011 |
| Kolbotn Autosenter AS | Wholesale & retail | 2011 |
| Kolbotn Blikkenslageri AS | Construction | 2012 |
| Kolbotn Eiendomsmegling AS | Real estate | 2017 |
| Kolbotn Elektro AS | Construction | 2019 |
| Kolbotn Fysikalske Institutt Da | Health & social care | 2010 |
| Kolbotn Grill AS | Hospitality | 2016 |
| Kolbotn Hud Og Velvære AS | Other services | 2015 |
| Kolbotn Hudpleie AS | Other services | 2005 |
| Kolbotn Hårstudio AS | Other services | 1994 |
| Kolbotn Klær AS | Wholesale & retail | 2004 |
| Kolbotn Legesenter AS | Health & social care | 2012 |
| Kolbotn Montasje AS | Construction | 2012 |
| Kolbotn Naprapatklinikk AS | Health & social care | 2015 |
| Kolbotn Optikk AS | Wholesale & retail | 1984 |
| Kolbotn Parkettsliperi AS | Construction | 1988 |
| Kolbotn Tannregulering AS | Health & social care | 2009 |
| Kolbotn Ur & Gull AS | Wholesale & retail | 2008 |
| Kolbotn Ur AS | Wholesale & retail | 1984 |
| Kolbotnkustom&Arkade AS | Professional & scientific | 2025 |
| Kolbotntannlegene AS | Health & social care | 2015 |
| Kolbotnveien 14 AS | Real estate | 2000 |
| Kolbotnveien 5 AS | Real estate | 2007 |
| Kompaniskap AS | Administrative & support | 2018 |