| Msdl Eiendom AS | Real estate | 2021 |
| Msdl Holding AS | Real estate | 2021 |
| Multiservice Bygg Og Servicetjenester AS | Construction | 2019 |
| Mykland Servicetjenester AS | Transport & logistics | 2015 |
| Mønsterkort Sør AS | Information & communication | 1997 |
| N59° Thor AS | Construction | 2025 |
| Najs Invest AS | Real estate | 2026 |
| Naume AS | Construction | 2023 |
| Naval Robotics AS | Manufacturing | 2025 |
| NBS Montering AS | Construction | 2021 |
| NBS Norge AS | Wholesale & retail | 2021 |
| Nesbu Invest AS | Real estate | 2005 |
| Nicphil Nuf | Professional & scientific | 2013 |
| Nija Invest AS | Real estate | 2026 |
| Njord Energy AS | Wholesale & retail | 2020 |
| Noorvern AS | Construction | 2026 |
| Nordenskjold AS | Real estate | 2025 |
| Nordic Halo AS | Education | 2020 |
| Novembrini Malermeister AS | Construction | 2012 |
| Nurken AS | Professional & scientific | 2009 |
| Nye Fiskebrygga Macdonald Og Uppstad Ans | Real estate | 1990 |
| Nygata 3 Tangen AS | Construction | 2023 |
| Nylund Larsen AS | Professional & scientific | 2007 |
| Oceanvault Invest AS | | 2025 |
| Oiko AS | Professional & scientific | 1989 |
| Oiko Kurs Og Events AS | Education | 2021 |
| Olsen & Harridsleff Da | Wholesale & retail | 1996 |
| Olsen Maritime AS | Manufacturing | 2014 |
| Optiker Knut Myren AS | Wholesale & retail | 2007 |
| Optismart AS | Transport & logistics | 2025 |
| Paradiseintuscany AS | Professional & scientific | 2016 |
| Paulsen & Sønn AS | Construction | 1989 |
| Paulsen Eiendom Risør AS | Construction | 1989 |
| Paulsen Holding AS | Construction | 2005 |
| Peta Offshore Service AS | Professional & scientific | 2020 |
| Peterhead AS | Hospitality | 2001 |
| Piap AS | | 2021 |
| Pir 1 AS | Hospitality | 2024 |
| Prestegata 7 AS | Real estate | 2026 |
| Primecon AS | Real estate | 1997 |
| Prommen Pub Da | Hospitality | 1994 |
| Prosjektkultur AS | Real estate | 2009 |
| Psti Holding AS | Real estate | 2021 |
| Psykepleier AS | Education | 2013 |
| Psykiater Heidi Husby AS | Health & social care | 2019 |
| Psykiatriklinikken AS | Health & social care | 2014 |
| Psykiatritjenester AS | Health & social care | 2009 |
| Raa Norge AS | Real estate | 2005 |
| Raadhuset Eiendomsmegling AS | Real estate | 2004 |
| Raks Holding AS | | 2021 |
| RBP Invest AS | Financial services | 2021 |
| Reinemo Bygg & Service AS | Construction | 2026 |
| Rewood Produksjon AS | Manufacturing | 2026 |
| Rh-Solution AS | Wholesale & retail | 2024 |
| Ringo Lillesand AS | Wholesale & retail | 2014 |
| Risør Autosenter AS | Wholesale & retail | 1992 |
| Risør Bil & Dekksenter AS | Wholesale & retail | 2021 |
| Risør by AS | Professional & scientific | 2015 |
| Risør Båt & Motor Da | Wholesale & retail | 1990 |
| Risør Båtsenter AS | Wholesale & retail | 1995 |
| Risør Eiendom AS | Construction | 2011 |
| Risør Eiendomsutvikling AS | | 2021 |
| Risør Engineering AS | Professional & scientific | 2007 |
| Risør Events AS | Arts & recreation | 2016 |
| Risør Fysikalske Institutt AS | Health & social care | 2020 |
| Risør Gjestehus AS | Agriculture & fishing | 1994 |
| Risør Halloween AS | Administrative & support | 2025 |
| Risør Heis Og Elektroservice AS | Construction | 2009 |
| Risør Hotel AS | Hospitality | 2005 |
| Risør Håndtverk & Vaktmestertjeneste AS | Administrative & support | 2011 |
| Risør Kran & Transport AS | Transport & logistics | 2026 |
| Risør Kroa AS | Hospitality | 1995 |
| Risør Kunstsenter Ans Elin Hassel Og Egil Hassel | Wholesale & retail | 1990 |
| Risør Næringsgård AS | Real estate | 2009 |
| Risør Parkering AS | Transport & logistics | 2021 |
| Risør Pukkservice AS | Mining & quarrying | 2022 |
| Risør Rederi AS | | 2021 |
| Risør Regnskap AS | Professional & scientific | 2019 |
| Risør Resort, Moen Camping AS | Hospitality | 2009 |
| Risør Rør AS | Construction | 2006 |
| Risør Smia AS | Manufacturing | 2009 |
| Risør Snekkeri AS | Manufacturing | 2007 |
| Risør Tannlegesenter Ans | Health & social care | 2001 |
| Risør Taxi Ans | Transport & logistics | 1996 |
| Risør Trapp AS | Manufacturing | 2009 |
| Risør Trebåtbyggeri AS | Manufacturing | 1998 |
| Risør Trebåtbyggeri Eiendom AS | Manufacturing | 1979 |
| Risør Trebåtbyggeri Holding AS | Manufacturing | 2005 |
| Risør Trebåtbyggeri Invest AS | Administrative & support | 2005 |
| Risør Trevarefabrikk AS | Wholesale & retail | 2000 |
| Risør Tur & Taxi AS | Transport & logistics | 2024 |
| Risør Tvedestrand Regionens Avfallsselskap Rta AS | Water & waste | 1997 |
| Risørneset AS | Real estate | 2015 |
| Risørveien 667 AS | Real estate | 2023 |
| Rochi Eiendom AS | Real estate | 2012 |
| Romstølen Park Utleie AS | Real estate | 2018 |
| Royen Drift AS | Professional & scientific | 2021 |
| Royen Holding AS | Professional & scientific | 2005 |
| RS Experience AS | Administrative & support | 2021 |
| RT Entreprenørservice AS | Administrative & support | 2017 |