| A-Dekk Og Service AS | Wholesale & retail | 2022 |
| Abc Beverage AS | Wholesale & retail | 2025 |
| Accorto AS | Real estate | 2021 |
| Agea Media AS | Professional & scientific | 2023 |
| Akerholt Media AS | Professional & scientific | 2020 |
| Akf Holding AS | | 2021 |
| Aktiv Auto AS | Wholesale & retail | 2019 |
| Aktivitetshus Ormåsen AS | Arts & recreation | 2026 |
| Alfa Discs Sport AS | Manufacturing | 2020 |
| Alfsen Holding AS | | 2021 |
| Algabo Holding AS | | 2025 |
| Amorari Holding AS | | 2023 |
| Amygdala Coaching Og Veiledning AS | Education | 2020 |
| Anleggsgartneren Eiker AS | Administrative & support | 2019 |
| Annbjørn AS | Manufacturing | 2026 |
| Arneberggata Eiendom AS | Construction | 2021 |
| Artigiano AS | Real estate | 2020 |
| Asia Mat Egersund AS | Wholesale & retail | 2003 |
| Aulie Bygg Og Eiendom AS | Construction | 2019 |
| Bakke Ventures Holding AS | | 2026 |
| Beauty Blend AS | Other services | 2025 |
| Bekkenhelsespesialist AS | Health & social care | 2025 |
| Bekko Holding AS | | 2022 |
| Bemio AS | Construction | 2019 |
| Ber Holding AS | Real estate | 2025 |
| Bergsand AS | Construction | 2018 |
| Bermingrud Eiendomsservice AS | Construction | 2025 |
| Bermingrud Invest AS | Construction | 2021 |
| Bermingrud Production AS | Professional & scientific | 2024 |
| Bernhardsen Eiendom AS | Real estate | 2018 |
| Bess Invest AS | Wholesale & retail | 2005 |
| Bildusjen AS | Other services | 2020 |
| Blomsterperrongen AS | Wholesale & retail | 2019 |
| Brdr. Bringebøen Trevarefabrikk Ans | Real estate | 1995 |
| Brekkegruppen Holding AS | | 2026 |
| Brødrene Warloff AS | Construction | 2002 |
| Brødrene Yndesdal Transport Da | Transport & logistics | 2009 |
| BS Torgersen AS | Wholesale & retail | 1987 |
| Bte Consult AS | Professional & scientific | 2013 |
| Budak Capital AS | | 2025 |
| Budak Holding AS | Health & social care | 2022 |
| Buskerud Betong Bygg AS | Construction | 2012 |
| Buskerud Oppussing AS | Construction | 2017 |
| Bygg Og Fix AS | Construction | 2023 |
| Byggkontakt AS | Wholesale & retail | 2019 |
| Bærekraft AS | Financial services | 2011 |
| C. Wilhelmsen Holding AS | Professional & scientific | 2018 |
| Care Solutions AS | Transport & logistics | 2023 |
| Cash Management Security AS | Administrative & support | 1991 |
| Cecti Holding AS | | 2022 |
| Cera Varehandel AS | Wholesale & retail | 2014 |
| Charma AS | Wholesale & retail | 2013 |
| Compliance Consult AS | Professional & scientific | 2015 |
| CPJ Holding AS | | 2021 |
| Dahl-Sundal Ingeniørtjenester AS | Professional & scientific | 2012 |
| Dbpf AS | | 2022 |
| Den Blå Grotte Ans | Wholesale & retail | 1993 |
| Disruptit AS | Information & communication | 2025 |
| Dolphin Kurs Og Kompetanse AS | Education | 2017 |
| Duin AS | Construction | 2024 |
| Dyrehotell Pets Paradise AS | Agriculture & fishing | 2007 |
| Eiker Elektro AS | Construction | 2024 |
| Eiker Høstelag AS | Wholesale & retail | 2018 |
| Eiker Næringspark AS | Real estate | 1992 |
| Eiker Sportsinvest AS | | 2023 |
| Eikern Turisttrafikk AS | Transport & logistics | 2018 |
| Eiktec AS | Other services | 2025 |
| El-Kompetanse AS | Education | 2024 |
| El-Status AS | Professional & scientific | 2025 |
| Elan Norge AS Elektrodeler | Wholesale & retail | 1990 |
| Elba AS | Wholesale & retail | 1991 |
| Elba Holding AS | Wholesale & retail | 2005 |
| Elfo Tech AS | Professional & scientific | 2018 |
| Eliassen & Co Holding AS | | 2022 |
| Elkon AS | Professional & scientific | 2012 |
| Emberland Tekstiler AS | Wholesale & retail | 2018 |
| Emr Holding AS | Real estate | 2014 |
| Engelsted AS | Construction | 2019 |
| Entreprenør Kristian Eriksen AS | Construction | 2024 |
| Erik J. Stenshorne AS | Construction | 2012 |
| El & Messeservice AS | Administrative & support | 1988 |
| Famek Holding AS | | 2023 |
| Felle Eiendomsutvikling Tomt 4 AS | Real estate | 2023 |
| FG Paneler AS | Wholesale & retail | 2017 |
| Fide Regnskap AS | Professional & scientific | 2021 |
| Fiskum Kombibygg 4 AS | Real estate | 2022 |
| Fiskum Kombibygg 7 AS | Real estate | 2023 |
| Fiskum Kombibygg BT1 AS | Real estate | 2025 |
| Fiskum Kombibygg BT2-01 AS | Real estate | 2025 |
| Fiskum Kombibygg BT2-02 AS | Real estate | 2025 |
| Fiskum Kombibygg BT4 AS | Real estate | 2025 |
| Fiskum Næringsområde 11 AS | Real estate | 2021 |
| Fiskum Ved AS | Wholesale & retail | 2019 |
| Fiskumparken AS | Real estate | 2014 |
| Fiskumparken C1-8 AS | Real estate | 2024 |
| Flexi - Gruppen AS | Real estate | 1989 |
| Flexi Soft AS | Information & communication | 1991 |
| FMP Invest AS | | 2024 |
| Fossen Grill Og Pizza Da | Hospitality | 2005 |
| Fraktoppdrag AS | Transport & logistics | 2024 |