| 123 Multiservice AS | Other services | 2021 |
| 247 Vaktmester AS | Administrative & support | 2025 |
| 2R Eiendom AS | | 2023 |
| 2VS Invest AS | Water & waste | 2020 |
| 3 D Form AS | Manufacturing | 2024 |
| 3HUS Bygg AS | Wholesale & retail | 2023 |
| 3PROSJEKT AS | Wholesale & retail | 2012 |
| 4 Eiendom Invest AS | Real estate | 2012 |
| 4 Årstider AS | Construction | 2020 |
| 4 Årstider Entreprenør AS | Construction | 2022 |
| 4 Årstider Holding AS | | 2023 |
| 4B Eiendom AS | | 2018 |
| 4HUMAN TQM AS | Information & communication | 2001 |
| 5D-MEKKING AS | Professional & scientific | 2024 |
| 73 Holding AS | Real estate | 2024 |
| 9 & the Bald AS | Real estate | 2012 |
| 92 Kopper Kaffe Filmproduksjon Ans | Information & communication | 2019 |
| A Amundsen Skotøyforretning AS | Wholesale & retail | 1965 |
| A C Bergersen & Sønner AS | Manufacturing | 1991 |
| A C Darre AS | Real estate | 1966 |
| A Djuve Holding AS | Real estate | 2021 |
| A H E Handel AS | Wholesale & retail | 2013 |
| A Heimholt AS | Construction | 1974 |
| A Hoff Eiendom AS | Real estate | 2012 |
| A Hoff Invest AS | Real estate | 2012 |
| A Michael Hylton Har Tziyon AS | Arts & recreation | 2026 |
| A Taste of France Da | Hospitality | 2004 |
| A&A Investments AS | Wholesale & retail | 2023 |
| A-B-L AS | Administrative & support | 2025 |
| A-B-L Holding AS | Administrative & support | 2025 |
| A. Collier Drift AS | Information & communication | 2023 |
| A. Collier Holding AS | Information & communication | 2023 |
| A. Jensen Import AS | Wholesale & retail | 2018 |
| A. Kiellands Gate 43 AS | Wholesale & retail | 2016 |
| A. Kiellands Gate 45 AS | Real estate | 2022 |
| A.Hauen Holding AS | Construction | 2021 |
| A.L. Høyer AS | Professional & scientific | 1988 |
| A.Sandvik Invest AS | | 2022 |
| Aabjørnsrød AS | Real estate | 1988 |
| Aac AS | Professional & scientific | 2013 |
| Aage Tho AS | Construction | 2011 |
| Aahb Holding AS | | 2019 |
| Aakre Invest AS | Financial services | 2011 |
| Aakre Transport AS | Transport & logistics | 2015 |
| Aaltvedt Betong AS | Manufacturing | 1980 |
| Aaltvedt Gruppen AS | Manufacturing | 2017 |
| Aaltvedt Utvikling AS | Real estate | 2021 |
| Aas & Goberg Ans | Wholesale & retail | 1999 |
| Aasbil AS | Wholesale & retail | 2013 |
| Aase Marie Holding AS | Real estate | 2021 |
| Aasheim Consulting AS | Professional & scientific | 2022 |
| Ab-Garage AS | Wholesale & retail | 2016 |
| Abb Electrification Norway AS | Manufacturing | 2018 |
| Abc Byggkonstruksjon AS | Construction | 2016 |
| Abc Maskin Holding AS | Wholesale & retail | 2005 |
| Abc Rørteknikk AS | Construction | 2024 |
| Abc Tak Og Byggservice AS | Construction | 2009 |
| Abc-Analyz AS | Wholesale & retail | 2011 |
| Abc-Maskin AS | Wholesale & retail | 1983 |
| Abrahamsen Gulvbehandling AS | Construction | 2025 |
| Abunajem Holding AS | Health & social care | 2022 |
| Abyss Eiendom Da | Real estate | 2004 |
| Acb Eiendom AS | Real estate | 2011 |
| Ace Elektro AS | Construction | 2020 |
| Acoin AS | | 2024 |
| Acoin Prosjekt AS | Professional & scientific | 2024 |
| Acs-Ytterbø AS | Real estate | 2012 |
| Active Innovation AS | Professional & scientific | 2002 |
| Acu Capital AS | | 2021 |
| Ad Astra Telemark AS | Wholesale & retail | 2022 |
| Adapt Arkitekter AS | Professional & scientific | 2016 |
| Addendum Holding AS | | 2023 |
| Adjunkt Arentzg 4 B AS | Real estate | 1992 |
| Adjunkt Arentzgate Vest 3A AS | Real estate | 2010 |
| Admoneo AS | Professional & scientific | 2025 |
| Adrenalynn AS | Wholesale & retail | 2020 |
| Adrett Holding AS | | 2026 |
| Advanced Engineering Systems AS | Wholesale & retail | 2004 |
| Advice Consulting Group AS | Professional & scientific | 2021 |
| Advitam AS | Health & social care | 2025 |
| Advokat Junker AS | Professional & scientific | 2024 |
| Advokatfirma Aspeflaten AS | Professional & scientific | 2018 |
| Advokatfirma Folseraas AS | Professional & scientific | 2011 |
| Advokatfirma Moen Erikstein AS | Professional & scientific | 2009 |
| Advokatfirmaet Asthor AS | Professional & scientific | 2008 |
| Advokatfirmaet Dyrland AS | Professional & scientific | 2022 |
| Advokatfirmaet Eurojuris Telemark Da | Professional & scientific | 2022 |
| Advokatfirmaet Jessen AS | Professional & scientific | 2010 |
| Advokatfirmaet Marqvardsen AS | Professional & scientific | 2022 |
| Advokatfirmaet Meland AS | Professional & scientific | 2011 |
| Advokatfirmaet Reinem Moen AS | Professional & scientific | 2024 |
| Advokatfirmaet Siri K. Karlsen AS | Professional & scientific | 2016 |
| Advokatfirmaet Skei AS | Professional & scientific | 2022 |
| Advokatfirmaet Tjentland AS | Professional & scientific | 2020 |
| Advokatfirmaet Wexels AS | Professional & scientific | 2026 |
| Advokatfirmaet Wexels Da | Professional & scientific | 2007 |
| Ady Bygg AS | Construction | 2018 |
| Aeris AS | Construction | 2006 |
| Aetos AS | Financial services | 2006 |
| Aetos Services AS | Professional & scientific | 2022 |