| Lillesand Auto Senter AS | Other services | 2023 |
| Lillesand Bilopphogging AS | Wholesale & retail | 2022 |
| Lillesand Bilopphogging Da | Wholesale & retail | 2006 |
| Lillesand Blikkenslager AS | Construction | 2014 |
| Lillesand Bygg Og Vaktmestertjenester AS | Construction | 2022 |
| Lillesand Båtpleie AS | Other services | 2016 |
| Lillesand Design AS | Manufacturing | 2003 |
| Lillesand Dyrlegekontor AS | Professional & scientific | 2021 |
| Lillesand Eiendomsutvikling AS | Real estate | 2024 |
| Lillesand Elektro AS | Construction | 2005 |
| Lillesand Elektro Eiendom AS | Real estate | 2018 |
| Lillesand Explorer AS | Administrative & support | 2018 |
| Lillesand Fotpleie AS | Other services | 2017 |
| Lillesand Hagesenter AS | Wholesale & retail | 2024 |
| Lillesand Hotel Norge AS | Hospitality | 2005 |
| Lillesand Hotel Norge Holding AS | Hospitality | 2022 |
| Lillesand Hotell Norge Eiendom AS | Hospitality | 2007 |
| Lillesand Hub AS | Professional & scientific | 2021 |
| Lillesand Invest AS | | 2020 |
| Lillesand Logopedi AS | Health & social care | 2024 |
| Lillesand Mathandel AS | Wholesale & retail | 2014 |
| Lillesand Musikkpub Og Restaurant AS | Hospitality | 2018 |
| Lillesand Optikk AS | Wholesale & retail | 2009 |
| Lillesand Pizza AS | Hospitality | 2008 |
| Lillesand Pukk AS | Mining & quarrying | 2012 |
| Lillesand Regnskap Og Økonomi AS | Professional & scientific | 2014 |
| Lillesand Senter Drift AS | Administrative & support | 2014 |
| Lillesand Sport AS | Wholesale & retail | 2021 |
| Lillesand Tannlegesenter AS | Health & social care | 2019 |
| Lillesand Teknikk AS | | 2026 |
| Lillesand Treindustri AS | Real estate | 2018 |
| Lillesand Treningssenter AS | Arts & recreation | 2026 |
| Lillesand VVS AS | Construction | 2007 |
| Lillesands Sparebank | Financial services | 1852 |
| Lillesands-Posten AS | Information & communication | 1993 |
| Lillesandsbruket 2 AS | Real estate | 2015 |
| Lillesandsbruket AS | Real estate | 2011 |
| Lilleskog-Service AS | Administrative & support | 2024 |
| Lillis AS | Manufacturing | 1986 |
| Lindhagen AS | Wholesale & retail | 2014 |
| Livet I Firkanter AS | Wholesale & retail | 2022 |
| Llama AS | Health & social care | 2014 |
| LMJ Holding AS | Construction | 2005 |
| Lofthus Panorama AS | Real estate | 2010 |
| Loma Plata AS | | 2023 |
| Lossius Takst AS | Real estate | 2020 |
| Loyal Entertainment AS | | 2021 |
| Lozen Produkter AS | Wholesale & retail | 2017 |
| Lucky 19 AS | Real estate | 2007 |
| Luhma Care AS | Wholesale & retail | 2010 |
| Lunde Holding Invest AS | Real estate | 2020 |
| Lvvs 4790 AS | Real estate | 2025 |
| Lyhammer Konsulenttjenester AS | Professional & scientific | 2024 |
| Løining Holding AS | Financial services | 2018 |
| Løland Industri AS | Manufacturing | 2024 |
| Løseth Urologi Og Generell Kirurgi AS | Health & social care | 2019 |
| Løvstakken AS | Real estate | 2021 |
| M D Mekanisk AS | Manufacturing | 2025 |
| M-Comm AS | Professional & scientific | 2025 |
| M.Jorkjend AS | Wholesale & retail | 2024 |
| Madverket AS | Hospitality | 2019 |
| Magic Karma AS | Hospitality | 2025 |
| Magne Gitmark & Co AS | Wholesale & retail | 1996 |
| Makaito AS | Real estate | 2016 |
| Malermester Grarup & Co AS | Construction | 2003 |
| Malina Holding AS | Professional & scientific | 2007 |
| Maling Og Tilsynsservice AS | Construction | 2017 |
| Malm Eiendom AS | Real estate | 2021 |
| Malm Invest AS | Real estate | 2002 |
| Malmen AS | Wholesale & retail | 1997 |
| Mama Investment AS | Financial services | 2016 |
| Manka Gruppen AS | Wholesale & retail | 2018 |
| Marius Egeland Arkitekter AS | Professional & scientific | 1985 |
| Marken Invest Limited Nuf | Other services | 2005 |
| Maskinentreprenøren Sør AS | Construction | 2006 |
| Mathiesen AS | | 1987 |
| Matias Flislegging AS | Construction | 2025 |
| Matlat AS | Information & communication | 2023 |
| Matverden AS | Wholesale & retail | 2017 |
| Matvognen AS | Hospitality | 2024 |
| Maurviga AS | Real estate | 2021 |
| Mayan AS | Manufacturing | 1991 |
| Megasoft Nuf | Information & communication | 2017 |
| Merkomp AS | Education | 2025 |
| Mgo Eiendom AS | Real estate | 1979 |
| Miljøhuset Holding AS | Real estate | 2005 |
| Miromurr AS | Information & communication | 2021 |
| Mis Holding AS | | 2019 |
| Mittberedskapslager AS | Professional & scientific | 2026 |
| Modal AS | Real estate | 1986 |
| Modus Invest AS | Real estate | 2017 |
| Modus Surf Nordic I AS | | 2019 |
| Moi Eiendom AS | Real estate | 2002 |
| Moi Invest | | 2017 |
| Monator Holding AS | | 2005 |
| Montasjeteknikk AS | Construction | 2016 |
| Morenen AS | Professional & scientific | 2004 |
| Morild AS | Professional & scientific | 2012 |
| Motell Sørlandet AS | Hospitality | 2017 |
| Mountainsnow AS | Information & communication | 2023 |