| K-Elektro AS | Construction | 2023 |
| K-Food Service AS | Hospitality | 2022 |
| K-H Service AS | Wholesale & retail | 1982 |
| K-Invest AS | | 1985 |
| K-J Invest AS | | 2025 |
| K-Konsult AS | Professional & scientific | 1982 |
| K-Løw Consulting AS | | 2023 |
| K-Nation AS | Arts & recreation | 2015 |
| K-Næss AS | Professional & scientific | 2010 |
| K-O Invest AS | | 2023 |
| K-Rent AS | Administrative & support | 2026 |
| K-Town Capital 1 AS | | 2026 |
| K. Askeland Holding AS | | 2022 |
| K. Aspelund AS | Arts & recreation | 2010 |
| K. Bull AS | Construction | 2013 |
| K. E. Solum AS | Real estate | 2005 |
| K. Ekrheim AS | Wholesale & retail | 1976 |
| K. Engdal Holding AS | | 2024 |
| K. Hagen Holding AS | | 2021 |
| K. Hagen Invest AS | Real estate | 2016 |
| K. Hansen Dagligvare AS | Wholesale & retail | 2018 |
| K. Hole Investments AS | Professional & scientific | 2013 |
| K. Jordal Holding AS | | 2024 |
| K. Kanu AS | Transport & logistics | 2026 |
| K. Karimi Holding AS | | 2026 |
| K. Kjærstad Holding AS | Professional & scientific | 2026 |
| K. Matheson Holding AS | | 2022 |
| K. Myrdahl Holding AS | | 2026 |
| K. Rex Holding AS | Wholesale & retail | 2013 |
| K. Telle AS | Professional & scientific | 2016 |
| K.A. Fem AS | Real estate | 1993 |
| K.Ariansen AS | Other services | 2014 |
| K.B.S AS | Construction | 2013 |
| K.C Invest AS | | 2022 |
| K.D. Holding AS | Professional & scientific | 2021 |
| K.E Myrvold AS | Professional & scientific | 2018 |
| K.E. Hjelle Holding AS | Real estate | 2020 |
| K.E.G Holding AS | Professional & scientific | 2022 |
| K.F. Transportservice AS | Transport & logistics | 2020 |
| K.H.R AS | | 2020 |
| K.I.S Cosmetics AS | | 2024 |
| K.I.S Holdings AS | | 2024 |
| K.Jacobsen Invest AS | Real estate | 2002 |
| K.L.O Holding AS | | 2021 |
| K.N Holding AS | | 2024 |
| K.O Rørservice AS | Construction | 2025 |
| K.P Capital Partners AS | Professional & scientific | 2024 |
| K.R. Håndverk Service AS | Construction | 2025 |
| K.R. Telle AS | Financial services | 2017 |
| K.S Bygg AS | Construction | 2004 |
| K.T. Blikk AS | Construction | 2020 |
| K.U.S Stockholm Sweden AB | Wholesale & retail | 2012 |
| K/F Eiendom AS | Real estate | 2007 |
| K/S Rør AS | Construction | 2004 |
| K1 Delikatesse AS | Hospitality | 2020 |
| K10 Bolig AS | Real estate | 2022 |
| K10 Parkering AS | Real estate | 2022 |
| K100JACK Holding Limited | | 2024 |
| K102 Eiendom AS | Real estate | 2021 |
| K11 Bolig AS | Real estate | 2021 |
| K12 Arkitekter AS | Professional & scientific | 2006 |
| K12 Holding AS | Real estate | 2019 |
| K12 Transportservice AS | Transport & logistics | 2024 |
| K14 Utvikling AS | Real estate | 2026 |
| K16 Eiendom AS | Real estate | 2019 |
| K2 Bar & Restaurant Drift AS | Hospitality | 2012 |
| K2 BIDCO1 AS | | 2025 |
| K2 Bygg & Eiendom AS | Construction | 2019 |
| K2 Capital Group AS | | 2026 |
| K2 Eiendom AS | Real estate | 2009 |
| K2 Elektro AS | Construction | 2013 |
| K2 Entreprenør AS | Construction | 2024 |
| K2 Equity AS | Information & communication | 2006 |
| K2 Equity AS | | 2026 |
| K2 Fastfood AS | Hospitality | 2018 |
| K2 Kapital AS | | 2021 |
| K2 Mi AS | | 2023 |
| K2 Property AS | Real estate | 2016 |
| K2 Prosjekt AS | Real estate | 2015 |
| K2 Trafikkskole AS | Education | 2022 |
| K2-EIENDOM Ans | Real estate | 2010 |
| K23-33 Boligutleie AS | Real estate | 2022 |
| K2H Consulting AS | Professional & scientific | 2014 |
| K2VL Vest Holding AS | | 2020 |
| K3 Montasje AS | Construction | 2017 |
| K3 Ventures AS | Wholesale & retail | 2025 |
| K30 Eiendom Limited | Real estate | 2007 |
| K33 Holding AS | Information & communication | 2020 |
| K33 Markets AS | Financial services | 2017 |
| K33 Operations AS | Information & communication | 2009 |
| K35 Kitchen AS | Hospitality | 2007 |
| K5-13 Boligutleie AS | Real estate | 2022 |
| K59 Blokk AS | Information & communication | 2024 |
| K8 Industridesign AS | Professional & scientific | 1998 |
| K8 Invest AS | | 2019 |
| K8 Og K9 Holding AS | Real estate | 2020 |
| K88 Bolig AS | Real estate | 2017 |
| K94L Holding AS | | 2016 |
| Ka 6 Eiendom AS | Real estate | 1996 |
| Ka Company AS | Wholesale & retail | 2024 |