| Impetus Afea Property AS | Real estate | 2024 |
| Insbo Sirnes Farge & Interiør AS | Wholesale & retail | 1991 |
| Instinct Flekkefjord AS | Arts & recreation | 2010 |
| Intersport Flekkefjord AS | Wholesale & retail | 1987 |
| Invertir AS | Financial services | 2013 |
| Ipc AS | Construction | 2010 |
| Iserv Computing AS | Information & communication | 2001 |
| Iversen Holding AS | Construction | 1986 |
| J & F Holding AS | | 2026 |
| Jaarple Holding AS | Financial services | 2017 |
| Jan E Larsen AS | Construction | 2018 |
| Janås Holding AS | | 2025 |
| Je Hogstad Invest AS | Wholesale & retail | 2018 |
| Jejaa AS | Hospitality | 2013 |
| Jerstad Invest AS | Transport & logistics | 2018 |
| JHK Automobil AS | Professional & scientific | 2022 |
| Johansen Revisjon AS | Professional & scientific | 2001 |
| JS Fitness AS | Other services | 2022 |
| Judankalle AS | Agriculture & fishing | 2017 |
| JW Crane Consult AS | Professional & scientific | 2020 |
| Kaffebørsen AS | Hospitality | 2015 |
| Karen Elene Thorsen AS | Arts & recreation | 2020 |
| Kaustad Holding AS | | 2023 |
| KH Eiendom AS | Real estate | 2025 |
| Kick Off Cafe Ans | Administrative & support | 2002 |
| Kinetech AS | Information & communication | 2022 |
| Kirkegaten 33 AS | Real estate | 2013 |
| Kirkegaten 35 AS | Real estate | 2000 |
| Kiropraktor Håvard Nordås AS | Health & social care | 2020 |
| Kitsj Dame Og Herrefrisør AS | Other services | 2017 |
| Kitsj Eiendom AS | Real estate | 2012 |
| Kittelsen AS | Arts & recreation | 2019 |
| Kjeveortoped Jannike Finn Jørnung AS | Health & social care | 2008 |
| Kjeveortopedi JFJ AS | Health & social care | 2026 |
| Kleivan Invest AS | Real estate | 2006 |
| Klinikk 1 AS | Other services | 2011 |
| Klinikk H AS | Health & social care | 2020 |
| Kndcv Eiendom AS | Real estate | 2022 |
| Kom I Form Da | Arts & recreation | 1996 |
| Komh AS | Real estate | 2021 |
| Kongens Gate 8 AS | Real estate | 2025 |
| KOTE37 AS | Financial services | 2021 |
| Kristensen Possession AS | Real estate | 2019 |
| Krosai AS | Professional & scientific | 2007 |
| Ksoland Holding AS | | 2025 |
| Kvanvik Landbruks-Utleie AS | Administrative & support | 2022 |
| Kvinen Eiendom AS | Real estate | 2016 |
| Kvinlog Holding AS | | 2021 |
| KVN Solutions AS | Professional & scientific | 2021 |
| Kym Holding AS | | 2023 |
| L a Larsen AS | Manufacturing | 1985 |
| L a Larsen Eiendom AS | Real estate | 1997 |
| Lauridsen Holding AS | | 2026 |
| Lavold Mek AS | Financial services | 2018 |
| LBS AS | Arts & recreation | 2022 |
| Lervik Brygge AS | Real estate | 2013 |
| Lervik Eiendom AS | Real estate | 2015 |
| Lervik Industri AS | Real estate | 2013 |
| Lila's AS | Wholesale & retail | 2011 |
| Lille Eigås Sport AS | Wholesale & retail | 2012 |
| Lillebille Flekkefjord AS | Wholesale & retail | 2006 |
| Lilleheia Holding AS | Real estate | 2023 |
| Lindhom Holding AS | Manufacturing | 2019 |
| Lingo Norge AS | Information & communication | 2010 |
| Lister & Gilje AS | Construction | 2013 |
| Lister Advokatene AS | Professional & scientific | 2000 |
| Lister Blikk AS | Construction | 2011 |
| Lister Engros Holding AS | Financial services | 2005 |
| Lister Godshåndtering AS | Transport & logistics | 2022 |
| Lister Hybelutleie AS | Real estate | 2019 |
| Lister Medical AS | Education | 2024 |
| Lister Småjobb AS | Construction | 2011 |
| Litledalen Barnehage SA | Education | 1989 |
| Livefuel AS | Education | 2024 |
| Loga Restaurantdrift AS | Hospitality | 2001 |
| Logas AS | Real estate | 2016 |
| Logens Selskapslokaler AS | Hospitality | 2013 |
| Logs Service Da | Professional & scientific | 2025 |
| Lund Fysioterapi Urstad AS | Health & social care | 2018 |
| Lundsen Legesenter Eiendom AS | Real estate | 2007 |
| Lux by Marita & Linett AS | Other services | 2017 |
| Lykrei AS | Administrative & support | 2021 |
| Lødd AS | | 2025 |
| Løvikgaten 1 AS | Real estate | 2006 |
| Løvland Invest AS | Financial services | 2005 |
| Løvland Kapital AS | | 2023 |
| M Og a Bygg Og Eiendom AS | Real estate | 2015 |
| M4 Elektro AS | Construction | 2020 |
| Magis Holding AS | Financial services | 2019 |
| Magnar Lund Maskin AS | Construction | 2006 |
| Magnes Auto AS | Other services | 2004 |
| Mali Haarstudio AS | Other services | 2025 |
| Maren Baxter AS | Professional & scientific | 2025 |
| Mariell Nor AS | Financial services | 2008 |
| Maritim Fjordhotell AS | Hospitality | 2006 |
| Markensgate 3A AS | Real estate | 2025 |
| Markensgate 3B AS | Real estate | 2012 |
| Marlowe AS | Professional & scientific | 2023 |
| Martins Bygg & Tømrertjenester AS | Construction | 2020 |
| Martins Motorservice AS | Manufacturing | 2012 |