| Lohne CF AS | Arts & recreation | 2026 |
| Lohne Næringstomter AS | Real estate | 2006 |
| Lord 1 AS | Real estate | 1998 |
| Lorden AS | Hospitality | 2003 |
| Lordens Invest AS | Real estate | 2018 |
| Lovest AS | Professional & scientific | 2016 |
| LT Maskin Drift AS | Construction | 2018 |
| Lta Dynamics AS | Professional & scientific | 2025 |
| LTM Eiendom AS | Construction | 2007 |
| Lto Holding AS | | 2025 |
| LTT Eiendom AS | Real estate | 2007 |
| LTT Utvikling AS | Real estate | 2002 |
| Luko AS | Real estate | 2005 |
| Luko Utvikling AS | Real estate | 2019 |
| Lunde Skilt AS | Professional & scientific | 2024 |
| Lundebygg AS | Construction | 2000 |
| Lundevik Anlegg AS | Construction | 2022 |
| Løhnner Holding AS | | 2024 |
| Løland & Berås Eiendomsmegling AS | Real estate | 2020 |
| M - Gruppen AS | Real estate | 2013 |
| M-Hus AS | Construction | 2005 |
| M.S. Investering AS | | 2026 |
| M4M Invest AS | Real estate | 1974 |
| Mactan AS | Real estate | 2017 |
| Madera AS | Real estate | 2021 |
| Magna Prosjekt Sør AS | Professional & scientific | 2019 |
| Malmø Hotell AS | Real estate | 2010 |
| Mammamia Shop Da | Wholesale & retail | 2016 |
| Managr. AS | Information & communication | 2020 |
| Mancave AS | Real estate | 2021 |
| Mandal Bensinstasjon AS | Wholesale & retail | 1987 |
| Mandal Bil AS | Wholesale & retail | 2017 |
| Mandal Bil Og Båtpleie AS | Other services | 2020 |
| Mandal Bilbutikk AS | Real estate | 2017 |
| Mandal Bilskade AS | Real estate | 2007 |
| Mandal Bilteknikk AS | Other services | 1991 |
| Mandal Bilverksted AS | Other services | 2017 |
| Mandal Brygge AS | Real estate | 2008 |
| Mandal Bygg AS | Construction | 2016 |
| Mandal Bygg Eiendom AS | Real estate | 2020 |
| Mandal Bygg Holding AS | Construction | 2020 |
| Mandal Byggeservice AS | Wholesale & retail | 1983 |
| Mandal Byggservice AS | Construction | 2008 |
| Mandal Båt AS | Wholesale & retail | 2026 |
| Mandal Castings AS | Manufacturing | 1998 |
| Mandal Castings Holding AS | Manufacturing | 2004 |
| Mandal Dekksenter AS | Wholesale & retail | 2010 |
| Mandal Eiendom AS | Construction | 2007 |
| Mandal Elektro AS | Construction | 1976 |
| Mandal Elektromarked AS | Wholesale & retail | 1996 |
| Mandal Energi AS | Financial services | 2005 |
| Mandal Farvehandel AS | Wholesale & retail | 1991 |
| Mandal Fiskegarnfabrikk AS | Real estate | 1976 |
| Mandal Gulvsliping AS | | 2022 |
| Mandal Handel AS | Wholesale & retail | 2014 |
| Mandal Havn Strømsvika AS | Real estate | 2016 |
| Mandal Helsekost AS | Wholesale & retail | 2014 |
| Mandal Hotel AS | Hospitality | 2017 |
| Mandal Industri AS | | 2021 |
| Mandal Isolering Da | Real estate | 1979 |
| Mandal Kjøleservice AS | Construction | 2007 |
| Mandal Last Og Buss AS | Other services | 1997 |
| Mandal Looms AS | Manufacturing | 2018 |
| Mandal Maling AS | Construction | 2019 |
| Mandal Maskinering AS | Manufacturing | 1992 |
| Mandal Mekanikk AS | Professional & scientific | 2013 |
| Mandal Motor AS | Wholesale & retail | 2012 |
| Mandal Motorsport AS | Other services | 2019 |
| Mandal Mur & Flis AS | Construction | 2013 |
| Mandal Næringsbygg AS | Real estate | 2000 |
| Mandal Og Lindesnes Begravelsesbyrå Ans | Other services | 2011 |
| Mandal Padel AS | Arts & recreation | 2023 |
| Mandal Parkering AS | Transport & logistics | 2003 |
| Mandal Rens & Vaskeri AS | Other services | 2014 |
| Mandal Resturandtdrift AS | Hospitality | 2026 |
| Mandal Rørleggerservice AS | Construction | 2012 |
| Mandal Sauelag SA | Agriculture & fishing | 2009 |
| Mandal Showroom AS | Wholesale & retail | 2024 |
| Mandal Smykker Og Klokker AS | Wholesale & retail | 2016 |
| Mandal Specsavers AS | Wholesale & retail | 2007 |
| Mandal Spesialistsenter AS | Health & social care | 2019 |
| Mandal Sportservice Da | Wholesale & retail | 1987 |
| Mandal Stillas AS | Construction | 2020 |
| Mandal Stillas Eiendom AS | Real estate | 2006 |
| Mandal Tank AS | Wholesale & retail | 2015 |
| Mandal Tannregulering AS | Health & social care | 2024 |
| Mandal Teppeveveri AS | Real estate | 2005 |
| Mandal Trading AS | Wholesale & retail | 2023 |
| Mandal Treningssenter AS | Arts & recreation | 2006 |
| Mandal Utleie AS | Administrative & support | 2019 |
| Mandal Vakt Og Redning AS | Administrative & support | 2001 |
| Mandal Verft Invest AS | Manufacturing | 2005 |
| Mandalitten Holding AS | Wholesale & retail | 2010 |
| Mandalkamerat Grill Og Pizza AS | Hospitality | 2019 |
| Mandals AS | Manufacturing | 2012 |
| Mandals Grill AS | Hospitality | 2024 |
| Mandalsbia AS | Agriculture & fishing | 2024 |
| Mandalselvens Elveeigarlag SA | Real estate | 1994 |
| Mandoscope AS | | 2025 |
| Maren AS | Water & waste | 2001 |