| Industriprofilering AS | Professional & scientific | 2025 |
| Ingeniør Dypvik AS | Professional & scientific | 2015 |
| Ingrid Andersen AS | Professional & scientific | 2017 |
| Innseilingen Marina AS | Transport & logistics | 2025 |
| Innsikteriet AS | Professional & scientific | 2015 |
| Intoto Invest AS | Real estate | 2005 |
| Introtek AS | Information & communication | 2020 |
| Inwivo Invest AS | | 2025 |
| ITS5 AS | Wholesale & retail | 2000 |
| Izio AS | Information & communication | 2014 |
| Izzy Holding AS | | 2023 |
| J/Sports AS | Professional & scientific | 2013 |
| Jatoma AS | Construction | 2012 |
| JBC Eiendom AS | Real estate | 2005 |
| Jensen Byggtjenester AS | Real estate | 2006 |
| Jiht Holding AS | | 2024 |
| JKR Holding AS | Financial services | 2006 |
| JM Malerservice AS | Construction | 2022 |
| JM Prosjekt AS | Professional & scientific | 2002 |
| Johe Invest AS | Hospitality | 2014 |
| Jon Christiansen Transport AS | Transport & logistics | 2006 |
| Jonas Nordby AS | Arts & recreation | 2020 |
| Jonik AS | Information & communication | 2009 |
| Josefine Sand AS | Other services | 2026 |
| JP Capital AS | Professional & scientific | 2021 |
| Jp-Tak AS | Construction | 2019 |
| Jro Invest AS | | 2005 |
| JS Investeringsselskap AS | | 2024 |
| Jøl Holding AS | Real estate | 2005 |
| K. Frantsen Invest AS | | 2022 |
| Kaffeblomsten AS | Wholesale & retail | 2024 |
| Karius Og Baktus Eiendom AS | Real estate | 2003 |
| Kasernen Hotelldrift AS | Hospitality | 2013 |
| Kemira Chemicals AS | Manufacturing | 1986 |
| Kfe Invest AS | | 2023 |
| Kilowott AS | Information & communication | 2018 |
| Kio Holding AS | | 2024 |
| Kira Consulting AS | Information & communication | 2017 |
| Kirkegaten 29A AS | Real estate | 1985 |
| Kjell Karlsen Kontrollforretning AS | Professional & scientific | 1992 |
| Kjell Øivind Og Per Tormod Eriksen Ans | Agriculture & fishing | 2002 |
| Kjelsaas Eiendom AS | Real estate | 1990 |
| Klar Bil Da | Other services | 2000 |
| Kloppafjellet Holding AS | | 2022 |
| Kme Investeringsselskap AS | Real estate | 2025 |
| Knatten Eiendom AS | Real estate | 2003 |
| Knitby AS | Wholesale & retail | 2021 |
| Knitteriet AS | Wholesale & retail | 2022 |
| Ko Investering AS | | 2025 |
| Komfort Solskjerming AS | Construction | 2023 |
| Konecranes AS | Manufacturing | 1988 |
| Kong Fredrik AS | Construction | 2021 |
| Kongensgate 38 AS | Real estate | 2026 |
| Konsulex AS | Professional & scientific | 2021 |
| Kopilot AS | Professional & scientific | 2018 |
| Kortbølgen 9 Eiendom AS | Real estate | 2016 |
| Kortbølgen Eiendom AS | Real estate | 2021 |
| Kovac Consulting AS | Professional & scientific | 2019 |
| KPH Drift AS | Hospitality | 2021 |
| Krohn AS | Wholesale & retail | 2009 |
| Kronos Norge AS | Mining & quarrying | 1916 |
| Kronos Titan AS | Manufacturing | 1988 |
| Krosnesveien 21B AS | Real estate | 2020 |
| KRV Holding AS | Health & social care | 2020 |
| Kulturkvartalet AS | Real estate | 2023 |
| Kvae Holding AS | Real estate | 2022 |
| Kvilvang Eiendom AS | Real estate | 2006 |
| Kvilvang Invest AS | Financial services | 2017 |
| Kvitebjørn AS | | 2018 |
| L&M Eiendom AS | Real estate | 2025 |
| Lafinto AS | Manufacturing | 2002 |
| Lafinto Defence AS | Wholesale & retail | 2025 |
| Lagermoduler ØRAVEIEN17 AS | Real estate | 2024 |
| Laika AS | Financial services | 2005 |
| Langvik Dagligvare AS | Wholesale & retail | 1982 |
| Lars Askheim AS | Wholesale & retail | 1997 |
| Lars Kristian Hunn AS | Professional & scientific | 2021 |
| Lars Krogstad AS | Information & communication | 2017 |
| Lasmar Holding AS | | 2019 |
| Lasse Nilsen Invest AS | | 2013 |
| LCS Håndverk AS | Administrative & support | 2025 |
| Leonard Invest AS | Real estate | 2013 |
| Lesing for Alle AS | Arts & recreation | 2022 |
| Lilja Works AS | | 2021 |
| Liquid Brands AS | Professional & scientific | 2018 |
| Liventa AS | | 2025 |
| Lobo AS | Real estate | 2026 |
| Lobo Eiendom AS | Real estate | 2022 |
| LPK AS | Manufacturing | 2005 |
| Ludama Invest AS | | 2020 |
| Ludvig Andersen AS | Transport & logistics | 1980 |
| Ludvix Invest AS | | 2022 |
| Lunds Hagesenter AS | Agriculture & fishing | 2022 |
| Lægene I Gamlebyen Ans | Health & social care | 2004 |
| M&Co AS | Wholesale & retail | 2018 |
| Maber Holding AS | | 2024 |
| Madeleine Flodin Holding AS | | 2026 |
| Major - Stuen AS | Hospitality | 1990 |
| Mali Partner AS | Wholesale & retail | 2013 |
| Manita Stange Forsikringspartner AS | | 2015 |