| Fremst AS | Professional & scientific | 2019 |
| Frisør Marianne AS | Other services | 2013 |
| Frostad & Høibraaten Consulting Da | Information & communication | 2003 |
| FSK VVS AS | Construction | 2022 |
| Fuhretech Invest AS | | 2025 |
| Funksport AS | Wholesale & retail | 2012 |
| Fyrhuset Solberg Spinderi AS | Real estate | 2008 |
| Fyrie-Dahl Holding AS | Wholesale & retail | 2025 |
| Fysiosenteret Mjøndalen AS | Health & social care | 1988 |
| Gabrielsen Invest AS | Professional & scientific | 2005 |
| Gami Eiendom AS | Real estate | 2023 |
| Gamita Holding AS | Real estate | 2023 |
| GKV9 AS | Real estate | 2017 |
| Greisen AS | Professional & scientific | 2015 |
| Grensesprengerne AS | Education | 2016 |
| Gros Kiosk Og Matbar AS | Real estate | 1986 |
| Gråbein Holding AS | Transport & logistics | 2009 |
| Gulv Under Føttene AS | Real estate | 2021 |
| Gundersen Medical AS | Health & social care | 2021 |
| Gusk Invest AS | | 2023 |
| Gustavsen AS | Wholesale & retail | 2004 |
| H&G Frisør AS | Other services | 2020 |
| Haarcompaniet Mjøndalen AS | Other services | 1997 |
| Hagness AS | | 2020 |
| Hagtjernveien 31 AS | Real estate | 2022 |
| Hairstudio AS | Other services | 2022 |
| Halvorsen Service AS | Other services | 2017 |
| Hansen & Larsen Tømrerfirma Ans | Construction | 1990 |
| Hansen-Johnsen Da | Education | 2026 |
| Harald Engerud AS | Transport & logistics | 2017 |
| Haust Invest AS | Professional & scientific | 2024 |
| Heab Holding AS | | 2018 |
| Heerb AS | Real estate | 2024 |
| Hel Prosjekt AS | Professional & scientific | 2021 |
| Helsehuset Legekontor Mjøndalen AS | Health & social care | 2020 |
| Henkimur AS | Construction | 2020 |
| HHR Holding AS | Construction | 2023 |
| HJ Elkontroll AS | Professional & scientific | 2020 |
| Hjelp Til Deg AS | Wholesale & retail | 2014 |
| HJT Impresario & Produksjon AS | Professional & scientific | 2019 |
| Hmla AS | Construction | 2026 |
| Horizonte Holding AS | Manufacturing | 2005 |
| Hsa Holding AS | | 2018 |
| Hte Eiendom AS | Real estate | 2011 |
| Hte Holding AS | Education | 2014 |
| Hte Montasje AS | Construction | 2012 |
| HW Handel AS | Wholesale & retail | 2023 |
| Hydropower AS | | 2022 |
| Håvard Gevelt Holding AS | Real estate | 2005 |
| Hære Autoservice AS | Other services | 2019 |
| Høiback Eiendom AS | Real estate | 2018 |
| Høiback Holding AS | Real estate | 2005 |
| Indian Kitchen & Bar AS | Hospitality | 2023 |
| Industrimotor AS | Wholesale & retail | 1992 |
| Intelliglass AS | Construction | 2026 |
| Intercreative AS | Administrative & support | 2013 |
| Investo-Consult Nuf | Information & communication | 2005 |
| Iog Partner AS | Professional & scientific | 2015 |
| Ipas Holding AS | Financial services | 2005 |
| Isaan AS | Other services | 2019 |
| Issa Holding AS | | 2026 |
| Iversen Media AS | Professional & scientific | 2025 |
| Jadefo Holding AS | Construction | 2010 |
| Jaw Holding AS | Financial services | 2016 |
| Jelpify AS | Information & communication | 2026 |
| Jho Holding AS | | 2021 |
| Jo Holth Invest AS | | 2023 |
| Jo Vestly Produksjon Ans | Information & communication | 1991 |
| Jo Vestly Produksjon AS | Information & communication | 1995 |
| Johnny Steen Holding AS | Real estate | 2008 |
| Johnsen-Service Da | | 2026 |
| JSK Eiendom AS | Real estate | 2005 |
| JTB Holding Nuf | Professional & scientific | 2009 |
| Kafe Kraft AS | Hospitality | 2019 |
| Kalbakken Kjøtt AS | Manufacturing | 2003 |
| Kamille Eiendom AS | | 2024 |
| Kartar AS | Real estate | 2018 |
| Katfoss Eiendomsdrift AS | Real estate | 2025 |
| Ki Bedriften AS | Information & communication | 2025 |
| Kids Outdoor Adventure Company AS | Wholesale & retail | 2019 |
| Kirketorget AS | Wholesale & retail | 1998 |
| Kjøkkenmontør Rolf Berg AS | Construction | 2004 |
| KK Komplett AS | Construction | 2024 |
| Kler Eiendom AS | Real estate | 1987 |
| Knipzet Arena AS | Real estate | 2026 |
| Knipzet AS | Professional & scientific | 2020 |
| Knipzet Holding AS | | 2025 |
| Koa Eiendom AS | Real estate | 2020 |
| Kobelco Welding of Europe AS | Wholesale & retail | 2022 |
| Koloss Entreprenørtjenester AS | Construction | 1991 |
| Koloss Produkter AS | Wholesale & retail | 2020 |
| Kompetansepartner Øst AS | Education | 2005 |
| Korpeveien Legeklinikk AS | Health & social care | 2020 |
| Korstevoll Gruppen AS | Wholesale & retail | 2011 |
| Krei Invest AS | | 2022 |
| Krok AS | | 2025 |
| Kunan Jas Eiendom AS | Hospitality | 2017 |
| Lagånd AS | Real estate | 2012 |
| Langum Holding AS | | 2021 |
| Laru Holding AS | | 2013 |