| Hylleodd 5 AS | | 2025 |
| Hymec Solutions AS | Administrative & support | 2026 |
| Håland Utstyr AS | Wholesale & retail | 1983 |
| Hårglede! AS | Other services | 2006 |
| Hægeland AS | Construction | 2013 |
| Høksås Eiendomsutvikling AS | Real estate | 2021 |
| Høksås Kompetanse AS | Administrative & support | 2023 |
| Høydepunkter AS | Administrative & support | 2026 |
| Høyland Bolig AS | Real estate | 2022 |
| Høyland-Larsen AS | | 2023 |
| Ibygget AS | Real estate | 2008 |
| Ici AS | Real estate | 2025 |
| Ide AS | Real estate | 2013 |
| Ide Bygg AS | Construction | 2012 |
| Ide Consulting AS | Professional & scientific | 2013 |
| Iderealisering Innovative Løsninger Ans | Information & communication | 2001 |
| Idfokus AS | Information & communication | 2001 |
| Ihme Bygg AS | Construction | 2014 |
| Ihme Energi AS | Construction | 2024 |
| Ihme Invest AS | | 2026 |
| Illyria AS | Hospitality | 2024 |
| Image Mandal AS | Wholesale & retail | 2014 |
| Imandal AS | Administrative & support | 2008 |
| Ime Verksted AS | Health & social care | 1990 |
| Imeto AS | | 2024 |
| In Vitam Cotidianam AS | Health & social care | 2024 |
| Indre Mannevær AS | Professional & scientific | 2021 |
| Inger Støles Fysioterapi AS | Health & social care | 2023 |
| Inhaus AS | Real estate | 2021 |
| Inhaus Eiendom AS | Real estate | 2021 |
| Inhaus Eiendom II AS | Real estate | 2024 |
| Inhaus Gågada AS | Real estate | 2018 |
| Inkasso Service Sør Ans | Administrative & support | 1997 |
| Innosolve AS | Information & communication | 2024 |
| Insono AS | Arts & recreation | 2023 |
| Inspire Helse AS | Health & social care | 2025 |
| Inspirerende Kurs AS | Education | 2025 |
| Intersport Mandal AS | Wholesale & retail | 1994 |
| Invest Syd AS | Real estate | 2022 |
| Iqi AS | Professional & scientific | 2000 |
| Iqi Eiendom AS | Real estate | 2004 |
| Iqi Invest AS | Real estate | 2018 |
| Iqi Prosjekt AS | Real estate | 2012 |
| Iriknatur AS | Professional & scientific | 2022 |
| Isblikk-Design AS | Wholesale & retail | 2025 |
| J. Aukland AS | | 2026 |
| Ja Arkitekter AS | Professional & scientific | 2021 |
| Jaarkitekter Holding AS | | 2023 |
| Jakobsen Rør AS | Construction | 2014 |
| Jakobsen Rør AS | Construction | 2025 |
| Jbox AS | | 2025 |
| Jess! Trafikkskole AS | Education | 2012 |
| JF Flekkefjord AS | Real estate | 2020 |
| Jhestås AS | Wholesale & retail | 2014 |
| JHP Forvaltning AS | Administrative & support | 2020 |
| Jja AS | Financial services | 2018 |
| Joalco AS | Wholesale & retail | 2019 |
| Jogu AS | Real estate | 2005 |
| John Roger Sørbøe Holding AS | Professional & scientific | 2019 |
| Johtex AS | Construction | 2020 |
| Joro Eiendom AS | Real estate | 2021 |
| Jorun Og Lorena AS | Other services | 2025 |
| JP Eiendom & Utleie AS | Real estate | 2025 |
| JTR AS | Administrative & support | 2014 |
| JTT Invest AS | Construction | 2020 |
| Juel Linge Arkitektur Ans | Professional & scientific | 2023 |
| Junes Frisørhjørne AS | Other services | 2020 |
| Jåbekk Gård AS | Wholesale & retail | 2026 |
| Jåbekk Handelspark AS | Real estate | 2023 |
| Jåbekk Industribygg AS | Real estate | 2001 |
| Jåbekk Samdrift Da | Agriculture & fishing | 2007 |
| K-Consult AS | Professional & scientific | 2018 |
| K-Ito AS | Real estate | 2011 |
| K-Torland Holding AS | Construction | 2020 |
| K-Vt AS | Manufacturing | 2021 |
| K37 Eiendom AS | Real estate | 2004 |
| K37 Holding AS | Real estate | 2018 |
| Kaas Holding AS | | 2016 |
| Kabeletaten AS | Information & communication | 2007 |
| Kaca Invest 1 AS | | 2025 |
| Kaca Invest 2 AS | | 2025 |
| Kaca Invest 3 AS | | 2025 |
| Kaca Invest AS | Real estate | 2013 |
| Kadutru AS | Real estate | 2009 |
| Kai G. Larsen Offshore AS | Professional & scientific | 2014 |
| Kali Invest AS | | 2022 |
| Kardemommeshop AS | Wholesale & retail | 2023 |
| Kastellet AS | Hospitality | 2005 |
| Kastellgata 11-13 AS | Wholesale & retail | 2001 |
| Kastellgaten Eiendom AS | Real estate | 2005 |
| Kastellgaten Næring AS | Real estate | 2008 |
| Kastellodden Brygge AS | Real estate | 2013 |
| KD Eiendom AS | Real estate | 2006 |
| KD Holding AS | Manufacturing | 2005 |
| KGB Consult AS | Professional & scientific | 2018 |
| Kimvi AS | | 2023 |
| Kioskdrift H & N AS | Wholesale & retail | 2024 |
| Kitendo Investment AS | | 2022 |
| Kjell Vidar Landelius AS | Wholesale & retail | 2009 |
| Kjellby Bygg AS | Construction | 2015 |