| 1HJELP.NO AS | Education | 2010 |
| 2A Eiendom AS | Real estate | 2005 |
| 2DADS Da | Information & communication | 2024 |
| 2T4 Bygg AS | Construction | 2024 |
| 3280 Invest AS | Real estate | 2014 |
| 331 Kapital AS | | 2026 |
| 3D Construction AS | Real estate | 2016 |
| 3DADS Studios AS | Information & communication | 2025 |
| 4DEKK AS | Other services | 2016 |
| 59 Eiendom AS | Real estate | 2019 |
| A & MB Holding AS | Manufacturing | 2005 |
| A - Uglum Invest AS | Real estate | 2017 |
| A Torp Invest AS | | 2026 |
| A&F Capital AS | | 2012 |
| A&M VVS AS | Construction | 2025 |
| A-I Eiendom AS | Real estate | 2022 |
| A-I Holding AS | Wholesale & retail | 2019 |
| A-Invest AS | | 2020 |
| A-Ka Holding AS | | 2026 |
| A-Vet Shop AS | Professional & scientific | 2020 |
| A-Vet Smådyrklinikk AS | Professional & scientific | 1994 |
| A. Hem AS | Administrative & support | 2019 |
| A. Hesselberg AS | Professional & scientific | 2017 |
| A.R.B AS | Wholesale & retail | 2025 |
| A1 Næringspark AS | Real estate | 2024 |
| A5 Næringspark AS | Real estate | 2022 |
| A6 Næringspark AS | Real estate | 2022 |
| Aa Invest AS | Construction | 2005 |
| Aarsten Eiendom AS | Real estate | 2005 |
| Aarsten Holding AS | Real estate | 2005 |
| Aasmund Invest AS | | 2025 |
| Abax AS | Information & communication | 2008 |
| Abax Group AS | Information & communication | 2017 |
| Abax Invest AS | Information & communication | 2017 |
| Abax Midco AS | Information & communication | 2017 |
| Abax Technology AS | Information & communication | 2012 |
| Abc-Rør AS | Construction | 2004 |
| Abno AS | Information & communication | 2019 |
| Abr Holding AS | | 2022 |
| Absolute AS | Financial services | 2005 |
| Access Consulting AS | Professional & scientific | 2014 |
| Ace Options Norge AS | Wholesale & retail | 2008 |
| Adeka AS | Wholesale & retail | 2002 |
| Adelaide Management AS | Professional & scientific | 2026 |
| Adelin AS | Wholesale & retail | 1972 |
| Adkomst AS | Wholesale & retail | 2012 |
| Advokat Jonny Sveen AS | Professional & scientific | 2020 |
| Advokat Kåre Eugen Jølberg AS | Professional & scientific | 2020 |
| Advokat Svein Drangeid AS | Professional & scientific | 2016 |
| Advokat Tove Nissen-Sollie AS | Professional & scientific | 2015 |
| Advokatene I Larvik AS | Administrative & support | 2020 |
| Advokatfellesskapet Torget 1 AS | Administrative & support | 2000 |
| Advokatfirmaet Foldnes AS | Professional & scientific | 2023 |
| Advokatfirmaet Gusland AS | Professional & scientific | 2025 |
| Advokatfirmaet Røed AS | Professional & scientific | 2001 |
| Advokatfirmaet Sigurd B Andersen & Tom Ergo Ans | | 1990 |
| Advokatfirmaet Wiik AS | Professional & scientific | 2025 |
| Aeh Bud AS | Transport & logistics | 2016 |
| Afbj Holding AS | Financial services | 2013 |
| AG Eiendom Larvik AS | Real estate | 1993 |
| Ageria AS | | 2025 |
| Ageria Bygg AS | Construction | 2025 |
| Ageria Takst AS | Real estate | 2025 |
| Agil Yield AS | Real estate | 2016 |
| Aglen Og Liens Pub AS | Hospitality | 2018 |
| Agnes Takstolfabrikk AS | Manufacturing | 2019 |
| Agunt AS | Information & communication | 2011 |
| Ahf Holding AS | Professional & scientific | 2014 |
| Ahh Holding AS | Professional & scientific | 2008 |
| Ahmad Norway AS | Transport & logistics | 2021 |
| Ajour Media AS | Information & communication | 1996 |
| Ak Johnsen Transport/Logistikk AS | Transport & logistics | 2025 |
| Aketo AS | Professional & scientific | 2017 |
| Aksveien Bolig AS | Real estate | 2007 |
| Akvarie & Utstyr Ans | Wholesale & retail | 1996 |
| Alam Invest AS | Health & social care | 2025 |
| Albert Bøe Eiendom AS | Real estate | 2012 |
| Albert Bøe Holding AS | Wholesale & retail | 2012 |
| Albert Bøe Industri & Isenkram AS | Wholesale & retail | 2012 |
| Albert Bøe Sport AS | Wholesale & retail | 2012 |
| Alexander Olsen Holding AS | Professional & scientific | 2022 |
| Alfa Eiendom AS | Real estate | 1993 |
| Alfa Tomter AS | Real estate | 2024 |
| Alfhaim Bygg AS | Construction | 2025 |
| Alfhild AS | Hospitality | 2012 |
| Alfr Andersens Gate 1 Larvik AS | Real estate | 1995 |
| Alfr Andersens Gate 3 Larvik AS | Real estate | 2018 |
| Alibaba Sushi AS | Hospitality | 2019 |
| Alibaba Telecom AS | Wholesale & retail | 2016 |
| Alijan Holding AS | | 2026 |
| All-Star Company AS | Wholesale & retail | 2015 |
| Alliansen Eiendom AS | Real estate | 2019 |
| Allison Industrial Norway AS | Wholesale & retail | 1994 |
| Allum Bygg AS | Construction | 1987 |
| Allum Holding AS | | 2026 |
| Alos Invest AS | Real estate | 2005 |
| Alpa Maskin AS | Construction | 1997 |
| Alterra AS | Wholesale & retail | 2024 |
| Altioria AS | | 2019 |
| Altrua AS | Information & communication | 2025 |