| A. Østvaag AS | Real estate | 2008 |
| Aa Consult AS | Professional & scientific | 2025 |
| AB Entreprenør Og Maskinutleie AS | Construction | 2025 |
| Abc Byggkontroll AS | Real estate | 2012 |
| Abe Star Parkett AS | Construction | 2000 |
| Acconor Accounting & Consulting AS | Professional & scientific | 2024 |
| Acconor AS | Professional & scientific | 2012 |
| Ace Regnskap AS | Professional & scientific | 2020 |
| Adekvat VVS AS | Construction | 2016 |
| Agob Eiendom AS | Real estate | 2021 |
| Aircondition Produkter AS | Construction | 2009 |
| Akershus Tungbilservice AS | Other services | 2017 |
| Akro AS | Construction | 1998 |
| Akutt-Vvs AS | Construction | 2025 |
| Al - Fattah Group Holding AS | | 2023 |
| Alfanor 26060 AS | | 2026 |
| Allsidige Bygg AS | Construction | 2011 |
| Amh Boligutvikling AS | Real estate | 2018 |
| Anders Smådal AS | Construction | 1989 |
| Andersrudveien Eiendom AS | Real estate | 2017 |
| Andresen Og Borthen AS | Construction | 1998 |
| Aniva AS | | 2025 |
| Anjoma AS | Real estate | 2007 |
| Anlegg & Industriservice AS | Manufacturing | 2016 |
| Anne Lund Consulting AS | Professional & scientific | 2026 |
| Aral Holding AS | Professional & scientific | 2024 |
| Areales AS | Wholesale & retail | 2018 |
| Arm International AS | Real estate | 2000 |
| Askjellrud Holding AS | | 2025 |
| Astra AS | Real estate | 2025 |
| Autoagenten AS | Wholesale & retail | 2017 |
| Ayme Renhold AS | Administrative & support | 2022 |
| B-Lås AS | Wholesale & retail | 2015 |
| Bakken Service Norge AS | Administrative & support | 2021 |
| Bakken X AS | | 2025 |
| Bakkesand Camping AS | Hospitality | 2023 |
| Bakkesand Holding AS | Hospitality | 2023 |
| Barberhuset AS | Other services | 2026 |
| Bettina Kojan AS | Education | 2023 |
| Bica AS | Wholesale & retail | 2017 |
| Bikemember AS | Information & communication | 2017 |
| Bindaraune AS | Professional & scientific | 1980 |
| Bjørnar KJ Holding AS | | 2024 |
| Bl-Hus AS | Real estate | 2021 |
| BNS Solutions AS | Manufacturing | 1997 |
| Bogerud Enebakk AS | Wholesale & retail | 2019 |
| Boligbygg Follo Entreprenør AS | Construction | 2019 |
| Bornerups Logistics AS | Information & communication | 2022 |
| Borthen Entreprenør AS | Construction | 2025 |
| Borthen Gruppen AS | Real estate | 2006 |
| Borthen Motorsport AS | Arts & recreation | 2011 |
| Bos Gruppen AS | Construction | 2022 |
| Bovik AS | Construction | 2019 |
| Braathen Landskapsentreprenør AS | Administrative & support | 1999 |
| Brede Østvaag AS | Construction | 2021 |
| Brenden & Co Stillasutleie AS | Construction | 1998 |
| Bruktbil Oslo Og Akershus AS | Wholesale & retail | 2020 |
| BSG Holding AS | Real estate | 2014 |
| Bygg & Frakt AS | Construction | 2023 |
| Bygg Og Tømmermester Per-Erik Østlie AS | Construction | 1982 |
| Byggkompass AS | Professional & scientific | 2026 |
| Ca Drilling | Construction | 2016 |
| Cacas AS | Wholesale & retail | 1993 |
| Carl Permin AS | Wholesale & retail | 1953 |
| Carnivora Norwegia AS | Education | 2025 |
| CF Glass & Railing AS | Construction | 2025 |
| Chipspesialisten AS | Other services | 2019 |
| Christine Lund Invest AS | | 2021 |
| Coin-It AS | Wholesale & retail | 2015 |
| Construction Supply AS | Wholesale & retail | 2018 |
| Consultrade AS | Wholesale & retail | 2001 |
| Credo Norge AS | Construction | 2023 |
| CT Consult AS | Professional & scientific | 2020 |
| Daggebygg AS | Arts & recreation | 2012 |
| Dansk Sprinkler Teknik | Construction | 2013 |
| Decon Mobility AS | Wholesale & retail | 2025 |
| Dekortext Ans | | 1988 |
| Din Investor AS | Professional & scientific | 2021 |
| Dinesen Norge AS | Wholesale & retail | 2008 |
| Dinp AS | Professional & scientific | 2024 |
| DKD Holding AS | Real estate | 2024 |
| Duonord AS | Information & communication | 2026 |
| E.T Holding AS | Real estate | 2022 |
| Earthy Minds AS | Wholesale & retail | 2021 |
| Easytablebooking Danmark Aps | Administrative & support | 2021 |
| Eias Eiendom AS | Real estate | 2008 |
| Eiendomsdrift Øst AS | Real estate | 2020 |
| Einar Braathen Oslo AS | Real estate | 2005 |
| Eirkraft AS | Health & social care | 2024 |
| Elite Bad Og Bolig AS | Construction | 2020 |
| Emisof AS | Real estate | 2022 |
| Enebakk Auto AS | Wholesale & retail | 2024 |
| Enebakk Bygg Og Vedlikehold AS | Construction | 1994 |
| Enebakk Byggevare AS | Construction | 2013 |
| Enebakk Dyrebutikk AS | Wholesale & retail | 2017 |
| Enebakk Og Viken Takst AS | Professional & scientific | 2016 |
| Enebakk Pro AS | Construction | 1994 |
| Enebakk Prosjekt Og Logistikk AS | Wholesale & retail | 2022 |
| Enebakk PT Studio AS | Education | 2026 |
| Enebakk Rør AS | Construction | 2022 |