| Arctic MC Tours AS | Arts & recreation | 2026 |
| Ardent AS | Professional & scientific | 2007 |
| Arenda AS | Real estate | 2021 |
| Arendal Treningholding AS | Real estate | 2015 |
| Arilds Opplæring AS | Education | 2024 |
| Ario AS | Professional & scientific | 2006 |
| Arkitekt Finn Christiansen AS | Professional & scientific | 2004 |
| Armaan Holding AS | Health & social care | 2025 |
| Arne's Montasje AS | Construction | 2019 |
| Art Pancom Invest AS | Real estate | 2014 |
| Arve R. Pisani Holding AS | | 2026 |
| AS Brann Og Sikringservice | Wholesale & retail | 1995 |
| AS Finnstra | Real estate | 1987 |
| AS Flodeløkken | Real estate | 1984 |
| AS Holding AS | | 2017 |
| AS Lahelleveien 1 | Real estate | 1979 |
| AS Storgaten 96 | Real estate | 1951 |
| AS Storgaten 96 C | Real estate | 1976 |
| AS Sverresgt 9 | Real estate | 1934 |
| AS Sentrumgården | Real estate | 1955 |
| AS Torvgt 12 | Real estate | 1970 |
| Asdahl Invest AS | | 2017 |
| Asdahl Sykepleiertjenester AS | Health & social care | 2016 |
| Asset 11 AS | Real estate | 2017 |
| Asset 14 AS | Real estate | 2019 |
| Asset 15 AS | Real estate | 2015 |
| Asset 17 AS | Real estate | 2020 |
| Asset 21 AS | Real estate | 2020 |
| Asset 23 AS | Real estate | 2019 |
| Asset 27 AS | Real estate | 2020 |
| Asset 28 AS | Real estate | 2021 |
| Asset 3 AS | Real estate | 2018 |
| Asset 33 Mellomselskap AS | Real estate | 2020 |
| Asset 36 AS | Real estate | 2021 |
| Asset 38 AS | Real estate | 2021 |
| Asset 4 AS | Real estate | 2016 |
| Asset 41 AS | Real estate | 2022 |
| Asset 7 AS | Real estate | 2017 |
| Astiro AS | Information & communication | 2023 |
| Astor Farstad Invest AS | Real estate | 1974 |
| Atdetgårann AS | Wholesale & retail | 2022 |
| Ate AS | Construction | 2012 |
| Atest Norge AS | Administrative & support | 2002 |
| Athene Trading AS | Financial services | 2005 |
| Atle Simonsen AS | Construction | 2021 |
| Atm Auto AS | Wholesale & retail | 2025 |
| Attestog Hansen AS | Administrative & support | 2025 |
| Attila Holding AS | Professional & scientific | 2026 |
| Atv Eiendom AS | Real estate | 2021 |
| Audvyr AS | Information & communication | 2018 |
| Augestadvegen 1 AS | Real estate | 2019 |
| Austadlia Investments AS | | 2022 |
| Autencia AS | Professional & scientific | 2000 |
| Autocarrera AS | Wholesale & retail | 2020 |
| Autogrande AS | Wholesale & retail | 2015 |
| Automotor Gruppen AS | Wholesale & retail | 2023 |
| Autopluss AS | Wholesale & retail | 2025 |
| Autostable Holding AS | | 2020 |
| Autostrada Bil AS | Wholesale & retail | 2018 |
| Autostrada Bilutleie AS | Administrative & support | 2018 |
| Autostrada Gruppen AS | Wholesale & retail | 2005 |
| Autostrada Porsgrunn AS | Wholesale & retail | 1999 |
| Autostrada X AS | Wholesale & retail | 2022 |
| Autotrade AS | Wholesale & retail | 2022 |
| Autovekt AS | Information & communication | 2023 |
| Avalon Spa & Helse AS | Other services | 2013 |
| Avalue AS | Information & communication | 2025 |
| Avarn Security Beredskap AS | Administrative & support | 2005 |
| Avenor Auto AS | Wholesale & retail | 2026 |
| Aviation Assets AS | Real estate | 2016 |
| Avility AS | Wholesale & retail | 2017 |
| Avrak AS | Information & communication | 2025 |
| Aw Initiative AS | | 2018 |
| Azene Da | Wholesale & retail | 2001 |
| Alf S. Wroldsen A/S | Real estate | 1988 |
| B&U Service AS | Manufacturing | 2023 |
| Babando AS | Health & social care | 2026 |
| Babando OY Nuf | Health & social care | 2026 |
| Bacau AS | Financial services | 2011 |
| Baderm Holding AS | Financial services | 2015 |
| Bagn Kraftverk Da | Energy | 1961 |
| Bakeverket AS | Manufacturing | 2007 |
| Bakeverket International AS | Wholesale & retail | 2019 |
| Bakås Fysioterapi AS | Health & social care | 2015 |
| Ballong for Fest AS | Wholesale & retail | 2018 |
| Balthazar AS | | 2024 |
| Bambleveien Eiendom AS | Real estate | 2004 |
| Bang Rød AS | Wholesale & retail | 2022 |
| Bangkok Food AS | Hospitality | 2021 |
| Bar & Kjøkken AS | Hospitality | 2015 |
| Bar AS | Real estate | 2017 |
| Bare Blåbær Invest AS | Real estate | 2017 |
| Base Holding AS | Real estate | 2015 |
| Bass Group AS | Real estate | 2020 |
| Bass Invest AS | | 2024 |
| Batterispesialisten AS | Wholesale & retail | 2011 |
| Baze Holding AS | Real estate | 2012 |
| Baze Technology AS | Information & communication | 2007 |
| Beautybar Porsgrunn AS | Other services | 2018 |
| Bedriftsveien 104 B AS | Real estate | 2008 |