| Kalve AS | Professional & scientific | 1993 |
| Kannestein AS | Wholesale & retail | 2012 |
| Kapital Og Finanspartner AS | Real estate | 2005 |
| Karma Booking Da | Arts & recreation | 2007 |
| Karosseri Nord AS | Manufacturing | 1983 |
| Kasig AS | Health & social care | 2023 |
| Kaz Holding AS | | 2021 |
| Keo Holdingselskap AS | Real estate | 2018 |
| Kfdi Bygg AS | Construction | 2025 |
| KH Supplies AS | Wholesale & retail | 2018 |
| Ki Elements AS | Wholesale & retail | 2024 |
| Kirkeveien 44 AS | Real estate | 2014 |
| Kjeldaas Eiendom AS | | 2023 |
| Kjeldaas Invest AS | | 2023 |
| Klavenes Eiendom AS | Real estate | 2005 |
| Klavenes Gård Og Gartneri AS | Agriculture & fishing | 2016 |
| Klavenes Industriservice AS | Administrative & support | 1984 |
| Kleivantoppen AS | Real estate | 2000 |
| Kleivbrottet 1 AS | Real estate | 2015 |
| Kleivbrottet 12 AS | Real estate | 2013 |
| Kleivbrottet 5 AS | Real estate | 2018 |
| Klokkerskogen AS | Real estate | 2020 |
| Klyvegården AS | Real estate | 2011 |
| Knut & Karlson Trading Ans | | 1987 |
| Kockegården AS | Real estate | 2010 |
| Kolberg, Caspary AS | Real estate | 1997 |
| Kom&C AS | Professional & scientific | 2006 |
| Kommunelegene I Holmestrand Da | Health & social care | 2013 |
| Kongensgate 2 Sandefjord AS | Real estate | 2016 |
| Konsulenttjenester Elektro AS | Professional & scientific | 2013 |
| Kornmagasingata 2 AS | Real estate | 2015 |
| Kremzo AS | Education | 2012 |
| KRS Fagerland AS | Wholesale & retail | 2014 |
| Krux Design AS | Professional & scientific | 2025 |
| Ks-Solutions AS | Professional & scientific | 2025 |
| Kullboden Dagligvare AS | Wholesale & retail | 2009 |
| Kuvaas Holding AS | Health & social care | 2023 |
| KZ Korn Da | Agriculture & fishing | 2023 |
| L.Thorsrud Holding AS | | 2024 |
| L4F Sør AS | Wholesale & retail | 2022 |
| Laguna Produkter AS | Manufacturing | 1997 |
| Langby Holding AS | | 2023 |
| Langgaten 24 AS | Real estate | 2005 |
| Langgaten 33 AS | Real estate | 2005 |
| Langgaten 45 AS | Real estate | 2005 |
| Langgaten 47 AS | Real estate | 2005 |
| Langgaten 48-50 AS | Real estate | 2012 |
| Langgaten Invest AS | | 2005 |
| Larsen Bygg AS | Construction | 2013 |
| Larzor AS | | 2024 |
| Leegaard AS | Wholesale & retail | 2005 |
| Leggera AS | Professional & scientific | 2002 |
| Leketorget AS | Wholesale & retail | 1991 |
| Leon Holding AS | Professional & scientific | 2005 |
| Let's Grow AS | Professional & scientific | 2026 |
| Lien Drift AS | Administrative & support | 2023 |
| Lilleholmestrand AS | Hospitality | 2010 |
| Limaco AS | Administrative & support | 2004 |
| Linko Invest AS | Professional & scientific | 2016 |
| Linnerud AS | Professional & scientific | 2010 |
| Linnka AS | Construction | 2012 |
| Liri AS | Real estate | 1983 |
| Lisl Holding AS. | | 2024 |
| Livesolutions AS | Wholesale & retail | 2018 |
| LKN Systems AS | Information & communication | 2006 |
| Lobod AS | Administrative & support | 2015 |
| Lonewolf AS | Information & communication | 2020 |
| LPG Vestfold AS | Wholesale & retail | 2008 |
| LSW Utbygging AS | Construction | 2012 |
| Ly Auto AS | Wholesale & retail | 2024 |
| Lyches AS | Real estate | 1985 |
| Lykvio AS | Information & communication | 2026 |
| Læringsressurser AS | Education | 2026 |
| Lærum Invest AS | | 2021 |
| Løvaas Eiendom AS | Real estate | 1985 |
| Løvaas Motor AS | Wholesale & retail | 2003 |
| M & R Arvidson AS | Construction | 2011 |
| Ma Burger AS | Hospitality | 2025 |
| Majoren AS | | 2005 |
| Malea AS | Wholesale & retail | 2005 |
| Malitech AS | Wholesale & retail | 2004 |
| Malmberg Eiendom AS | Real estate | 1973 |
| Mantin Eiendom AS | Real estate | 1996 |
| Marble Holding AS | | 2025 |
| Marie Olaussen AS | Arts & recreation | 2020 |
| Marmor AS | Manufacturing | 2013 |
| Marstin AS | Health & social care | 2024 |
| Martin Eiendom AS | Financial services | 2005 |
| Martin Kalager Drift AS | Manufacturing | 2005 |
| Martin Lindgren Knivskarpt AS | Wholesale & retail | 2023 |
| Martinsen Aviation AS | Administrative & support | 2019 |
| Maskinentrepenør Christian Eriksen AS | Construction | 2015 |
| Maskinnorge Eiendom AS | Real estate | 2021 |
| Maskintech AS | Manufacturing | 2021 |
| Master Renhold Og Eiendomsdrift AS | Real estate | 2013 |
| Meberg AS | Construction | 2017 |
| Meg&Lien AS | Professional & scientific | 2018 |
| Mema Holding AS | Wholesale & retail | 2020 |
| Mens Shop AS | Wholesale & retail | 1991 |
| Mesterhus Horten-Holmestrand-Sande AS | Real estate | 2015 |