| A Til Å Bygg AS | Construction | 2014 |
| A. Ekeberg Invest AS | | 2021 |
| Aat AS | Wholesale & retail | 2017 |
| Abea AS | Real estate | 2019 |
| Abea Eiendom AS | Real estate | 2020 |
| Abea Holding AS | Real estate | 2021 |
| Abec Holding AS | | 2019 |
| Ahea Holding AS | | 2019 |
| Aletta AS | | 2026 |
| Anestesitjeneste AS | Health & social care | 2020 |
| Arena for Folk AS | Professional & scientific | 2024 |
| Arnesen Maling & Interiør AS | Construction | 2013 |
| Arnesen Prosjektering & Drift AS | Real estate | 2025 |
| Auto Performance AS | Wholesale & retail | 2019 |
| Autostrada Kongsberg AS | Wholesale & retail | 2022 |
| Avaris AS | Professional & scientific | 2019 |
| B-A-S Eiendom AS | Real estate | 2006 |
| Bagstevold Holding AS | Wholesale & retail | 2005 |
| Bauda Klargjøringssenter AS | Other services | 2024 |
| Bemoto Eiendom AS | Real estate | 2020 |
| BM Ocean AS | Professional & scientific | 2023 |
| Braxo AS | Administrative & support | 2025 |
| Buskerud Byggservice AS | Real estate | 1999 |
| Byggtekniker Bogen AS | Professional & scientific | 2014 |
| Damåsen Pukkverk AS | Mining & quarrying | 2009 |
| E134 Damåsen AS | Construction | 2000 |
| Ebela Holding AS | | 2026 |
| Ecojet AS | Administrative & support | 2023 |
| Eiker Kran Og Utleie AS | Administrative & support | 2026 |
| Eiker Markiser AS | Wholesale & retail | 2012 |
| Eiker Media AS | Information & communication | 2021 |
| Eiker-Sko AS | Wholesale & retail | 1950 |
| Ekeberg Eiendomsselskap Ans | Real estate | 2005 |
| Elbio AS | Energy | 2019 |
| Eriksen VVS AS | Construction | 2022 |
| Erling Darbo AS | Other services | 2023 |
| Eta Norge AS | Construction | 2013 |
| Ethea Holding AS | Construction | 2021 |
| Evida Rør AS | Construction | 2021 |
| Expandia Eiendom AS | Real estate | 2020 |
| Expandia Moduler AS | Administrative & support | 2010 |
| FG Granitt & Hagemiljø AS | Construction | 2020 |
| Fida Eiendom AS | Real estate | 1909 |
| Fiskum Eiendom AS | Real estate | 2016 |
| Fiskum Fruktpresseri AS | Manufacturing | 2012 |
| Fiskum Holding AS | Administrative & support | 2005 |
| Fiskum Kombibygg 1 AS | Real estate | 2022 |
| Fiskum Kombibygg 5 AS | Real estate | 2023 |
| Fiskum Kombibygg 6 AS | Real estate | 2023 |
| Fiskum Kombibygg BT2-03 AS | Real estate | 2025 |
| Fiskum Mat AS | Wholesale & retail | 2014 |
| Fiskum Plate- & Sveiseverksted AS | Manufacturing | 2002 |
| Fiskumparken B1.2 AS | Real estate | 2020 |
| Flattum Auto AS | Wholesale & retail | 2025 |
| FPS Kranservice AS | Administrative & support | 2018 |
| Fiskum Bygg A/S | Wholesale & retail | 1988 |
| Færder Design & Produksjon AS | Manufacturing | 2020 |
| Gjerden Investering AS | | 2025 |
| Godalsveien SA | Real estate | 1975 |
| Godik AS | Administrative & support | 2019 |
| Gulden AS | Professional & scientific | 2026 |
| Halgrim AS | Wholesale & retail | 2011 |
| Halgrim Brum AS | Real estate | 2021 |
| Hals Sigrid Og Ingrid Ans | Agriculture & fishing | 1974 |
| Harpe AS | Real estate | 2020 |
| Hauser AS | Real estate | 2021 |
| Heijon AS | Wholesale & retail | 2021 |
| Hesshoen AS | Professional & scientific | 2025 |
| Hove Transport AS | Construction | 2021 |
| Hsho AS | | 2019 |
| Huseby Entreprenør AS | Construction | 2000 |
| Inspirasjoner AS | | 2014 |
| JM Eiendom AS | Real estate | 2002 |
| Katvik Eiendom AS | Administrative & support | 2006 |
| Kjeto AS | Real estate | 2017 |
| Kolsrud Holding AS | Real estate | 2014 |
| Kronson Invest AS | | 2024 |
| Laras Invest AS | | 2022 |
| Leander Eiendom AS | Real estate | 2023 |
| Leander Holding AS | Manufacturing | 2019 |
| Leret AS | Construction | 2013 |
| Leseglede Ans | Wholesale & retail | 2003 |
| Levante Innredninger AS | Construction | 2004 |
| Lumena Omsorg AS | Health & social care | 2018 |
| Lydglede AS | Wholesale & retail | 2019 |
| Mask Consulting AS | Information & communication | 2022 |
| Mastebogen Skogselskap Da | Agriculture & fishing | 1995 |
| Mestervarme Green Energy AS | Wholesale & retail | 2018 |
| Mha Eiendom AS | Real estate | 2025 |
| Myraløkka AS | Real estate | 2020 |
| O Thorrud AS | Real estate | 2014 |
| Olav L Strøm AS | Real estate | 2014 |
| Ovnsmontering AS | Construction | 2024 |
| Pa Hoen Holding AS | Financial services | 2015 |
| Parlock AS | Wholesale & retail | 2021 |
| PB Drift AS | Real estate | 1992 |
| Pedersen Kran Og Transport AS | Transport & logistics | 2018 |
| Prestebråtan 27 AS | Real estate | 2017 |
| Raaen-Hassel Skogsbilvei SA | Real estate | 1968 |
| Raaenseterveien Skogsbilvei SA | Agriculture & fishing | 1950 |