| Medevice AS | Professional & scientific | 2017 |
| Mesco AS | Financial services | 1998 |
| Mim Eiendom AS | Real estate | 2022 |
| Muchísimo Gusto AS | Hospitality | 2024 |
| Myliana AS | | 2018 |
| Myrland Anleggsservice AS | Construction | 2016 |
| Naper Kragerø AS | Real estate | 2000 |
| Nentie Norge AS | Real estate | 2021 |
| New Balance Norway AS | Wholesale & retail | 2017 |
| Nooa AS | Education | 2012 |
| Nordic Park Hill Co Ltd | | 2007 |
| Nordraak Eiendom AS | Real estate | 2025 |
| Nordraak Kragerø AS | Hospitality | 2025 |
| Norgesrådgivning AS | Professional & scientific | 1989 |
| Northern Lights AS | Information & communication | 2013 |
| NR 1 Trafikkskole Stathelle - Kragerø AS | Education | 2008 |
| Nye Admiralen AS | Hospitality | 2011 |
| Nye Campino AS | Hospitality | 2019 |
| Nye Elvann AS | Professional & scientific | 2020 |
| Nye Volum Frisør AS | Other services | 2024 |
| Nyvie Holding AS | Real estate | 2021 |
| Næring Og Hytteservice AS | Real estate | 2008 |
| O.K Holding AS | Manufacturing | 2020 |
| Oakhill Holding AS | Real estate | 2007 |
| Ofstad Capital AS | | 2023 |
| Olaf Paulsen & Sønn AS | Construction | 1998 |
| Ole Og Tores Rørservice AS | Construction | 2004 |
| Onkel Oskar AS | Hospitality | 2008 |
| Optiker Vestøl AS | Wholesale & retail | 1992 |
| Paa Hjørnet AS | Wholesale & retail | 2005 |
| Pah 25 AS | Real estate | 2019 |
| Palla Pharma Eiendom AS | Real estate | 2023 |
| Palla Pharma Norway AS | Manufacturing | 2016 |
| Palla Pharma Norway Holding AS | Manufacturing | 2017 |
| Palmz AS | Wholesale & retail | 2026 |
| Paradistoppen Vann Og Avløpslag SA | Water & waste | 2010 |
| Pe - Holding AS | Administrative & support | 2005 |
| Peder Aarø AS | Administrative & support | 2013 |
| Peripack Da | Wholesale & retail | 2010 |
| Pese Invest AS | Professional & scientific | 2024 |
| Pfsb Holding AS | | 2025 |
| Pixel Elite AS | Professional & scientific | 2018 |
| Plan Bolig AS | Real estate | 2019 |
| PM Kragerø AS | Real estate | 2024 |
| Pmin AS | Construction | 2021 |
| Po Service AS | Professional & scientific | 2017 |
| Popup AS | Hospitality | 2018 |
| Posthusgården AS | Real estate | 2002 |
| Posthusgården Kragerø AS | Real estate | 1956 |
| Potetfabrikken AS | Hospitality | 2026 |
| Printz Jacobs Holding AS | Real estate | 2017 |
| Prosjektrelasjoner AS | Information & communication | 2016 |
| Prå Eiendom AS | Administrative & support | 2008 |
| PT Consulting AS | Professional & scientific | 2005 |
| Pudu AS | Professional & scientific | 2019 |
| Pura Holding AS | Real estate | 2007 |
| Pynt AS | Administrative & support | 2008 |
| Ragnars AS | Manufacturing | 2009 |
| Ramsalt Kragerø Da | Arts & recreation | 2021 |
| Recruiting in Norway AS | Administrative & support | 2020 |
| Redningen Eiendom AS | Real estate | 2005 |
| Regnskapskontoret Eriksen AS | Professional & scientific | 2005 |
| Ren Invest AS | Administrative & support | 2022 |
| Rengjøringshjelpen Kragerø AS | Administrative & support | 2016 |
| Risle AS | Professional & scientific | 2022 |
| Rosa Luxemburg Ans | Other services | 1995 |
| Runar Larsen AS | | 2025 |
| Runar Larsen Eiendom AS | Real estate | 2026 |
| Runar Larsen Taxibåtservice AS | Transport & logistics | 2011 |
| Rune Brekka AS | Construction | 2013 |
| Rune Evensen AS | Construction | 2019 |
| Rådhusgata 3 AS | Real estate | 2021 |
| Rådyrveien AS | Real estate | 2015 |
| Rødhall Holding AS | | 2024 |
| Rørvik Holding AS | Real estate | 2015 |
| Rørviktunet AS | Real estate | 2024 |
| S. Muffetangen Holding AS | Wholesale & retail | 2018 |
| Sa-Bygg AS | Construction | 2004 |
| Salt-Neven AS | Real estate | 2026 |
| Sandåsen Eiendom AS | Real estate | 2007 |
| Sankti AS | Manufacturing | 2022 |
| Seder AS | Real estate | 2011 |
| Seizan Invest AS | Information & communication | 2024 |
| Sentrumsgården Kragerø AS | Real estate | 2013 |
| Shape Regime Norway AS | Wholesale & retail | 2023 |
| Shepp Eiendom AS | Real estate | 2022 |
| Si Logopedi AS | Health & social care | 2024 |
| Silke Og Dynamitt AS | Professional & scientific | 2023 |
| SIM1 Holding AS | | 2026 |
| Sivilarkitekt S. Bothner Og Planhuset AS | Professional & scientific | 2020 |
| Skagerak Rekruttering AS | Administrative & support | 2003 |
| Skauen Elservice AS | Real estate | 2002 |
| Skien Næringseiendom AS | Real estate | 2006 |
| Skilbrei Bygg AS | Construction | 2014 |
| Skin Medical Gruppen AS | Health & social care | 2012 |
| Skjærgården Ferie Og Eiendom AS | Real estate | 1994 |
| Skjærgårdsgartner Kragerø AS | Administrative & support | 2025 |
| Skoglandet AS | Real estate | 2024 |
| Slippen Marina AS | Manufacturing | 2009 |
| Sluppan AS | Wholesale & retail | 1983 |