| Horisonten Conference Catering & Cafe AS | Hospitality | 2024 |
| Hortemo Holding AS | | 2026 |
| Hos Oss Holding AS | Hospitality | 2022 |
| Hos Oss Lillesand AS | Hospitality | 2017 |
| Hri Eiendom AS | Real estate | 2002 |
| HSL AS | Construction | 2025 |
| Hundeland Bygg AS | Construction | 2019 |
| Hundelykke AS | Education | 2021 |
| Hårluxe AS | Other services | 2022 |
| Hårtveit Ans | Wholesale & retail | 2020 |
| Høvåg Trimmen AS | Arts & recreation | 2009 |
| Ib Eiendom AS | Real estate | 2006 |
| Ib Motorservice AS | Wholesale & retail | 2019 |
| Ibb Holding AS | Real estate | 2025 |
| Iflyt AS | Health & social care | 2026 |
| IL2-B Amundrød AS | Real estate | 2019 |
| Im Invest AS | | 2022 |
| Imenes Invest AS | Real estate | 2021 |
| Impentab AB | Administrative & support | 1999 |
| In Hårdesign AS | Other services | 2021 |
| Industri Og Boligvarme AS | Wholesale & retail | 2019 |
| Industri Og Boligvarme Eiendom AS | Real estate | 2005 |
| Industritek AS | Professional & scientific | 2020 |
| Ing S Lindeberg AS | Real estate | 1975 |
| Ingeborg Blekastad Bedriftsrådgivning AS | Professional & scientific | 2021 |
| Ingeborg Rosenberg AS | Arts & recreation | 2013 |
| Interiørfruene AS | Wholesale & retail | 2018 |
| Intranor Consulting Da | Professional & scientific | 1996 |
| Iris Parfymeri AS | Wholesale & retail | 1988 |
| Isbrand Holding AS | | 2025 |
| Itek AS | Wholesale & retail | 1995 |
| Jag Betong AS | Construction | 2023 |
| Jahnsen Holding AS | | 2025 |
| Jar Rådgivning AS | Professional & scientific | 2017 |
| Jaro Malerservice AS | Construction | 2025 |
| Jeb Invest Sør AS | Real estate | 2011 |
| Jens Eide AS | Manufacturing | 2003 |
| Jerman AS | Real estate | 2015 |
| Jerstad Holding AS | Real estate | 2016 |
| JG Skripeland AS | | 2019 |
| JLS Holding AS | | 2025 |
| Johannessen Eiendom AS | Real estate | 2004 |
| Johansen Og Foldvik Vann Ans | Real estate | 1992 |
| John Edvin Berg AS | Wholesale & retail | 2021 |
| Jortveit Eiendom AS | Real estate | 2021 |
| JRJ Film & TV Produksjon AS | Information & communication | 1998 |
| Just Bee AS | Education | 2019 |
| Just Padel Lillesand AS | Real estate | 2022 |
| Justøy Vann Og Avløp AS | Water & waste | 2005 |
| Justøygavlen AS | Real estate | 2018 |
| K Skeie Holding AS | | 2026 |
| Kaage Invest AS | Manufacturing | 2004 |
| Kaldvell Eiendom AS | Real estate | 2008 |
| Kaldvell Åpen Barnehage AS | Education | 2023 |
| Kalvild Gård AS | Arts & recreation | 2006 |
| Karina Dettmer AS | Arts & recreation | 2026 |
| Kartlia AS | Wholesale & retail | 2020 |
| KC Bygg AS | Construction | 2005 |
| Kibrom Grillsenter AS | Hospitality | 2024 |
| Kimida AS | Real estate | 2025 |
| Kistevig AS | Construction | 2024 |
| Kjerlingland Hest Og Aktivitetsgård AS | Agriculture & fishing | 2010 |
| Kjøkken-Centeret Lillesand AS | Wholesale & retail | 2002 |
| Klan Eiendom Ans | Real estate | 1990 |
| Kleivsmoen AS | Real estate | 2016 |
| Klipptid AS | Other services | 2025 |
| Knapskog Safety Management AS | Professional & scientific | 2018 |
| Ko-As AS | Construction | 2019 |
| Kommode Datter AS | Professional & scientific | 2026 |
| Kommode Holding AS | Wholesale & retail | 2015 |
| Kornbrekke Invest AS | | 2021 |
| Kraton AS | | 2024 |
| Kristengård Og Myhrebakken Blikk AS | Construction | 2024 |
| Krsferie AS | Real estate | 2019 |
| KT. Invest AS | Financial services | 2014 |
| Kulia Holding AS | | 2025 |
| Kultur Lillesand Kirke AS | Arts & recreation | 2026 |
| Kulturkarusellen AS | Arts & recreation | 2024 |
| Kvadraturen Holding AS | Real estate | 2009 |
| Kvamsø Holding AS | | 2025 |
| Kystvirke AS | Real estate | 2008 |
| Køhler-Drift AS | Administrative & support | 2023 |
| L-Tre Eiendom AS | Real estate | 1995 |
| L-Tre Holding AS | Wholesale & retail | 2006 |
| Lancer AS | Hospitality | 2025 |
| Larmo Holding AS | Real estate | 2005 |
| Larsen IT Consult AS | Information & communication | 2013 |
| Larsen Møbeltapetsering Og Kalesjer AS | Other services | 2019 |
| Laupsa Holding AS | Construction | 2022 |
| LBF Holding AS | Wholesale & retail | 2016 |
| Lekeplasskontroll Sør AS | Professional & scientific | 2023 |
| Leli K AS | Manufacturing | 2017 |
| Lemondrop AS | Wholesale & retail | 2014 |
| Levi & Alina Holding AS | | 2026 |
| Lhi Holding AS | Real estate | 2020 |
| Libir Næring AS | Water & waste | 2015 |
| Life Is Now Consulting AS | Professional & scientific | 2023 |
| Lillemalmen AS | Real estate | 1993 |
| Lillesand Anlegg AS | Construction | 2011 |
| Lillesand Auto AS | Wholesale & retail | 2019 |