| Alna Manuellterapi Og Fysioterapi AS | Health & social care | 2013 |
| Alna Møbel Og Interiør AS | Wholesale & retail | 2021 |
| Alna Park AS | Real estate | 1987 |
| Alna Regnskap AS | Professional & scientific | 2009 |
| Alna Senter AS | Real estate | 2018 |
| Alna Senter Holding AS | Real estate | 2017 |
| Alna Stålbygg AS | Wholesale & retail | 2010 |
| Alna Tannregulering AS | Health & social care | 2023 |
| Alna Trafikkskole AS | Education | 2002 |
| Alna Trafikkskole B T Rasmussen Ans | Education | 1995 |
| Alnablsi Transport AS | Transport & logistics | 2025 |
| Alnabru Bilpleie AS | Other services | 2022 |
| Alnabru Eiendom AS | Real estate | 2005 |
| Alnabru Holding AS | Real estate | 1996 |
| Alnabru Industri AS | Real estate | 1986 |
| Alnabru Kombinasjonseiendom I AS | Real estate | 2013 |
| Alnabru Trust Corp | Real estate | 1997 |
| Alnabrukvartalet AS | Real estate | 1933 |
| Alnabruveien 9 AS | Real estate | 2022 |
| Alnabruvn. 7 AS | Real estate | 2015 |
| Alnagata AS | Real estate | 2020 |
| Alnajjar Holding AS | Professional & scientific | 2021 |
| Alne AS | Health & social care | 2018 |
| Alng 4 AS | Transport & logistics | 2011 |
| Alng 5 AS | Transport & logistics | 2011 |
| Alng ASA | Transport & logistics | 2011 |
| Alng Technical Management AS | Transport & logistics | 2012 |
| Alng Trading AS | Transport & logistics | 2025 |
| Alnitak Holding AS | | 2018 |
| Aloa the Label AS | Wholesale & retail | 2023 |
| Aloh.As | Health & social care | 2022 |
| Aloha Oslo AS | Real estate | 2018 |
| Alohdi Group AS | Real estate | 2005 |
| Alohomora AS | | 2021 |
| Alonso-Dang Invest AS | | 2018 |
| Alonzo AS | Wholesale & retail | 2025 |
| Alonzo Holding AS | Wholesale & retail | 2025 |
| Aloo Da | Information & communication | 2004 |
| Aloo Ventures AS | Wholesale & retail | 2024 |
| Alopex Holding AS | | 2016 |
| Alorus AS | Professional & scientific | 2017 |
| Alp Bygg Og Eiendom AS | | 2021 |
| Alp Verdi AS | Other services | 2023 |
| Alpa AS | Wholesale & retail | 2024 |
| Alpaca for You Ans | Wholesale & retail | 2001 |
| Alpaca Holding AS | Financial services | 1999 |
| Alpakka Grande AS | Professional & scientific | 2017 |
| Alpenglow AS | | 2024 |
| Alperama AS | | 2023 |
| Alpers Kommunikasjon AS | Professional & scientific | 2026 |
| Alpha AI AS | Information & communication | 2024 |
| Alpha Asset Management AS | | 2023 |
| Alpha Brands AS | Wholesale & retail | 2021 |
| Alpha Capital AS | Real estate | 2013 |
| Alpha Eiendom Oslo AS | Real estate | 2005 |
| Alpha Eight AS | Information & communication | 2023 |
| Alpha Eight Zero AS | | 2025 |
| Alpha Event AS | Arts & recreation | 2017 |
| Alpha Finans AS | Real estate | 2015 |
| Alpha Forretningsførsel AS | Professional & scientific | 2011 |
| Alpha Franchise Consulting AS | Administrative & support | 2017 |
| Alpha Holdco AS | | 2025 |
| Alpha Legegruppe AS | Health & social care | 2012 |
| Alpha Media AS | Professional & scientific | 2017 |
| Alpha Negotiations AS | Professional & scientific | 2016 |
| Alpha Omega Norden AS | Professional & scientific | 2002 |
| Alpha One AS | | 2017 |
| Alpha Phoenix AS | | 2025 |
| Alpha Pianos AS | Manufacturing | 2019 |
| Alpha Portfolio AS | Real estate | 2016 |
| Alpha Revisjon AS | Professional & scientific | 1995 |
| Alpha Shipping Advisors AS | | 2018 |
| Alpha Solutions Norge AS | Information & communication | 2018 |
| Alpha Transport AS | Transport & logistics | 2021 |
| Alpha Two AS | Financial services | 2021 |
| Alpha XL AS | Real estate | 2006 |
| Alphaai AS | | 2025 |
| Alphabet Bidco AS | Information & communication | 2021 |
| Alphabet Midco I AS | Information & communication | 2021 |
| Alphabet Midco II AS | Information & communication | 2021 |
| Alphabet Topco AS | Information & communication | 2021 |
| Alphabetic AS | Professional & scientific | 2024 |
| Alphacent AS | Real estate | 2020 |
| Alphadata AS | Financial services | 2000 |
| Alphadent AS | Wholesale & retail | 2017 |
| Alphasea AS | Information & communication | 2016 |
| Alphaumi Consulting AS | Professional & scientific | 2023 |
| Alphaview Da | Wholesale & retail | 1998 |
| Alphaville Capital AS | | 2019 |
| Alphawolf AS | | 2024 |
| Alphax Capital AS | | 2024 |
| Alphecca AS | | 2022 |
| Alpi Norway AS | Transport & logistics | 2019 |
| Alpin Hemsedal AS | Real estate | 2017 |
| Alpin Shipping AS | Transport & logistics | 2023 |
| Alpina Grate Norge AS | Wholesale & retail | 2025 |
| Alpina Norge AS | Construction | 2021 |
| Alpinbooking AS | Hospitality | 2010 |
| Alpine Capital AS | Financial services | 2005 |
| Alpine Innovation AS | Professional & scientific | 2025 |