| 12C Invest AS | Real estate | 2017 |
| 1H Holding AS | | 2018 |
| 329 Invest AS | | 2026 |
| A-J Bygg AS | Construction | 2022 |
| Aatangen Holding AS | Real estate | 2008 |
| Abrahamsenfisk AS | Agriculture & fishing | 2020 |
| Aco AS | Real estate | 2005 |
| Ad Undas AS | Wholesale & retail | 2009 |
| Addict AS | Wholesale & retail | 2019 |
| Adele Restaurant Kragerø AS | Hospitality | 2024 |
| Advokatfirmaet Hvattum AS | Professional & scientific | 1994 |
| Advokatfirmaet Midgaard & Co AS | Professional & scientific | 2008 |
| Afiber AS | Information & communication | 2017 |
| Agder Meglerinvest AS | Real estate | 2018 |
| Agric AS | Information & communication | 2018 |
| Ahp Holding AS | Real estate | 2020 |
| Aij Invest AS | Real estate | 2018 |
| Ais Holding AS | Information & communication | 2022 |
| Ajm Invest AS | | 2019 |
| Alarm Systemer AS | Administrative & support | 1979 |
| Allianse Holding Kragerø AS | Construction | 2014 |
| Allianse Produkter AS | Wholesale & retail | 2014 |
| Allianse Stillas AS | Construction | 2008 |
| Amoe Holding AS | Professional & scientific | 2016 |
| AMZ81 AS | Wholesale & retail | 2020 |
| Annalyse AS | Professional & scientific | 2018 |
| Apotekgården Kragerø AS | Real estate | 2013 |
| Arken Kragerø Dyreklinikk AS | Professional & scientific | 2007 |
| Arkitekt-Online AS | Professional & scientific | 2022 |
| Arkitekthuset Kragerø AS | Professional & scientific | 1999 |
| Arups Gate 3 Holding AS | | 2025 |
| AS El Paso | Hospitality | 1976 |
| Astad AS | Arts & recreation | 2022 |
| Asturi Holding AS | Construction | 2005 |
| Auto Bygg AS | Real estate | 1994 |
| Auto LX AS | Wholesale & retail | 2024 |
| Aven Eiendom Kragerø AS | Real estate | 2017 |
| Aven Holding Kragerø AS | Manufacturing | 2021 |
| Awgulv AS | Construction | 2025 |
| B.K.E AS | Real estate | 2018 |
| B1 Kragerø AS | Real estate | 2020 |
| B13 Kragerø AS | Real estate | 2017 |
| B14-15 Kragerø AS | Real estate | 2020 |
| B4 Kragerø AS | Real estate | 2018 |
| B45 Eiendom AS | | 2025 |
| B45 Industribygg AS | Construction | 2024 |
| B45 Norge AS | Construction | 2019 |
| BA5 Ekstra 42 AS | Real estate | 2025 |
| Baatdeler.No AS | Wholesale & retail | 2018 |
| Baderoms Design AS | Real estate | 2025 |
| Badeungen AS | Wholesale & retail | 2017 |
| Bakke Vei Og Bane AS | Administrative & support | 2014 |
| Bakkerudsbunker AS | Arts & recreation | 2021 |
| Banktomta AS | Real estate | 2021 |
| Barmen Invest AS | Wholesale & retail | 2022 |
| Barmen Sag AS | Wholesale & retail | 2015 |
| Barney Holding AS | Real estate | 2018 |
| Berg-Kragerø Museum Arkiv Og Magasin AS | Professional & scientific | 2026 |
| Bergland Restaurant Og Selskapslokaler Ans | Hospitality | 1999 |
| Bestillingsverker AS | Arts & recreation | 2025 |
| Bestpizza AS | Hospitality | 2016 |
| Bestwear AS | Wholesale & retail | 2024 |
| Betty- AS | Real estate | 2017 |
| Biac AS | Wholesale & retail | 2010 |
| Bied AS | Real estate | 2005 |
| Biotek Academy Scandinavia AS | Wholesale & retail | 2015 |
| Biørnehuset AS | Professional & scientific | 2022 |
| Bjerka Eiendom AS | Real estate | 1984 |
| BKS Rådgivning AS | Professional & scientific | 2020 |
| Blikkenslager Tarald Jørgensen AS | Construction | 2008 |
| Blimo AS | Education | 1991 |
| Blue Sportswear Norge AS | Wholesale & retail | 2011 |
| Bob Salong AS | Other services | 2023 |
| Bondens Marked Telemark SA | Wholesale & retail | 2005 |
| Bonny Minimarked AS | Wholesale & retail | 1980 |
| Bonus AS | Real estate | 1987 |
| Borge AS | Real estate | 1928 |
| BR Brubakkens Eiendomsselskap Ans | Real estate | 1996 |
| Braco Holding AS | Real estate | 1997 |
| Bratsj Eiendom AS | Construction | 2007 |
| Brekka & Kjølseth Designs AS | Professional & scientific | 2018 |
| Brekka Bros AS | Real estate | 2025 |
| Brygga Fysikalske Institutt Da | Health & social care | 2014 |
| Brygga Mat AS | Wholesale & retail | 1998 |
| Bryggetuss Da | Construction | 2007 |
| Brænna AS | Wholesale & retail | 2023 |
| Brødrene Brubakken AS | Wholesale & retail | 1974 |
| Brødrene Mylius Eiendom AS | Real estate | 2007 |
| Buchholm Cafe AS | Hospitality | 1987 |
| Buen Bygg AS | Professional & scientific | 1992 |
| Byfjellet Parkering AS | Real estate | 1999 |
| Bygg Service Kamil Majczak AS | Construction | 2013 |
| Byggmester Apeland AS | Construction | 1999 |
| Byggmesterfirma Egil a. Myrstrand AS | Construction | 2014 |
| Byggservice Tatarski AS | Construction | 2026 |
| Bårøy Holding AS | Financial services | 2016 |
| Båt Og Motorservice Kragerø AS | Manufacturing | 2022 |
| Båten Eiendom AS | Real estate | 2016 |
| Bærøkrafft AS | Information & communication | 2025 |
| Cae Holding AS | | 2018 |