| Langesund Bad Da | Hospitality | 2006 |
| Langesund Bad Holding AS | Hospitality | 2005 |
| Langesund Bad Residence AS | Real estate | 2016 |
| Langesund Båthavn AS | Real estate | 2022 |
| Langesund Fotterapiklinikk AS | Health & social care | 2018 |
| Langesund Fysikalske Institutt Da | Health & social care | 2014 |
| Langesund Landhandel AS | Wholesale & retail | 2016 |
| Langesund Miniatyrskipsbyggeri AS | Manufacturing | 2004 |
| Langesund Ostemakeri AS | Manufacturing | 2016 |
| Langesund Panorama AS | Real estate | 2021 |
| Langesund Sjømat AS | Manufacturing | 1985 |
| Langesund Windsurfingsenter Pedersen Og Pettersen Ans | Wholesale & retail | 1987 |
| Langesundfisk AS | Manufacturing | 2014 |
| Lash Life AS | Other services | 2017 |
| Leno AS | Professional & scientific | 2009 |
| Luisa Invest AS | Hospitality | 2020 |
| Lundebua Ans | Wholesale & retail | 2005 |
| Lundtech AS | Professional & scientific | 2000 |
| Langesunds-Reken AS | Wholesale & retail | 1980 |
| M&T Express AS | Transport & logistics | 2025 |
| M. Weber Holding AS | | 2023 |
| Ma Lyd Og Lys AS | Arts & recreation | 2025 |
| Maabø Eiendom AS | Real estate | 2022 |
| Madame Bolette Patch Og Gave AS | Wholesale & retail | 1991 |
| Madi Invest AS | Wholesale & retail | 2006 |
| Madsens Fire Flate AS | Arts & recreation | 2022 |
| Marniko Holding AS | | 2006 |
| Maro International Trading Company AS | Wholesale & retail | 1997 |
| Martinik AS | Professional & scientific | 2006 |
| Mestalaget AS | Professional & scientific | 2022 |
| MH Havfiske AS | Agriculture & fishing | 2015 |
| Miismo AS | Financial services | 2016 |
| Miljøbølgen AS | Manufacturing | 2007 |
| Mmo Holding AS | Real estate | 2014 |
| Mmo Utvikling AS | Real estate | 2022 |
| Moncherry AS | Transport & logistics | 2021 |
| Mordi Eiendom AS | Real estate | 2006 |
| Mustad Bygg AS | Construction | 1990 |
| Mustad Invest AS | Construction | 2022 |
| Mustad Utvikling AS | Real estate | 2018 |
| NFH 260401 AS | | 2026 |
| NFH 260402 AS | | 2026 |
| Nilsenbygg Eiendom AS | Construction | 2007 |
| Nilsenbygg Holding AS | Construction | 2007 |
| Nilsve Invest AS | Financial services | 2011 |
| Nor Bunkring AS | Wholesale & retail | 2006 |
| Norwegian Medical Consulting AS | Health & social care | 2013 |
| Olea Agency AS | Wholesale & retail | 2026 |
| Pae-Mh Invest AS | | 2023 |
| Papas Restaurant Langesund AS | Hospitality | 2004 |
| Papirkriger AS | Information & communication | 2019 |
| PBF Consulting AS | Professional & scientific | 2026 |
| Peking House AS | Hospitality | 2010 |
| Petacon AS | Professional & scientific | 2021 |
| Petpowerhouse AS | Wholesale & retail | 2016 |
| Pneumabeam AS | Wholesale & retail | 2023 |
| Prodigy Holding AS | Information & communication | 2022 |
| Psykologspesialist Christina Holen Lunde AS | Health & social care | 2023 |
| Pål Pedersen AS | Administrative & support | 1999 |
| Quality Skjærgården Hotel Og Badepark AS | Hospitality | 1990 |
| R K Consult AS | Wholesale & retail | 2007 |
| R&B Norge AS | Professional & scientific | 2021 |
| Reimes Rekefabrikk AS | Wholesale & retail | 1996 |
| Rochester Kapital AS | Real estate | 2008 |
| Rørlegger John Haugerud AS | Construction | 2026 |
| Rørlegger Myhra AS | Construction | 2014 |
| Salen Holding AS | Real estate | 2005 |
| Salen Utvikling AS | Real estate | 2019 |
| Samoht AS | | 2021 |
| Santa Fe Klippotek AS | Other services | 2021 |
| Sbo Holding AS | Real estate | 2019 |
| Scansia AS | Real estate | 1978 |
| Sec-Consult AS | | 2013 |
| Sekse Eiendomsutvikling Da | Real estate | 2002 |
| Sekse Holding AS | Real estate | 2007 |
| Sewil Design 2.0 AS | Professional & scientific | 2026 |
| Signaturen Eiendom AS | Construction | 2020 |
| Sjese AS | Information & communication | 2021 |
| Sjøstrøm Manuellterapi AS | Health & social care | 2013 |
| Skager Eiendom AS | Real estate | 2005 |
| Skager Service AS | Transport & logistics | 2000 |
| Skagerak Eiendomsutvikling AS | Real estate | 2023 |
| Skagerak Holding AS | Real estate | 2018 |
| Skagerrak Maritim AS | Transport & logistics | 2026 |
| Skjærgårdshallen AS | Real estate | 2000 |
| Skougaarden AS | Real estate | 2009 |
| Solkysten Fisk & Skalldyr AS | Wholesale & retail | 2023 |
| Solkysten Fisk & Skalldyr Holding AS | | 2025 |
| Solkysten Invest AS | Financial services | 2014 |
| Solkysten Tannhelse AS | Health & social care | 2004 |
| Solkysten Vol 2 AS | Wholesale & retail | 2026 |
| Solsiden Drift AS | Hospitality | 2021 |
| Spiro Holding AS | | 2013 |
| Stahlsberg AS | Professional & scientific | 2020 |
| Steinleggern Ans | Agriculture & fishing | 2001 |
| Stille Styrke May Way AS | Education | 2025 |
| Storberget AS | Professional & scientific | 2011 |
| Stormen Pub AS | Hospitality | 2025 |
| Stulen AS | Real estate | 1990 |
| Stulen Holding AS | Manufacturing | 2009 |