| Tømterud Holding AS | Real estate | 2007 |
| Uffe Byggare V/Ulf Eriksson | Construction | 2005 |
| Underholdningssjefen AS | Professional & scientific | 2023 |
| Uniflora AS | Financial services | 2016 |
| Uno Sætheråsen Invest AS | Financial services | 2013 |
| Urban Studios AS | Education | 2025 |
| Vakker Bolig AS | Wholesale & retail | 2023 |
| Valunor AS | Manufacturing | 2020 |
| Vannvettene AS | Education | 2023 |
| Vard Eiendom AS | Real estate | 2019 |
| Ve Utleie AS | Real estate | 2012 |
| Verksted Grossisten Kongsvinger AS | Wholesale & retail | 2024 |
| Veslelia Holding AS | Professional & scientific | 2019 |
| Vestad Eiendomsutvikling AS | Real estate | 2011 |
| Vestum Norway AS | Wholesale & retail | 2022 |
| Veterinær Bjørn Moen AS | Professional & scientific | 2005 |
| Viktori - Ivan Chotov | Transport & logistics | 2011 |
| Ving Partner AS | Wholesale & retail | 1934 |
| Vinger Barber Club AS | Other services | 2026 |
| Vinger Data AS | Wholesale & retail | 2022 |
| Vinger Drift AS | Hospitality | 2015 |
| Vinger Finnskog Bil Og Mek AS | Other services | 2026 |
| Vinger Flis Og Bad AS | Construction | 1970 |
| Vinger Lakk Og Karosseri AS | Other services | 2006 |
| Vinger Landhandel AS | Wholesale & retail | 2023 |
| Vinger Og Glåmdal Trykkeri AS | Manufacturing | 1998 |
| Vinger Pole Fitness AS | Arts & recreation | 2021 |
| Vinger Utmarkslag SA | Arts & recreation | 1994 |
| Vinger Vask AS | Other services | 2025 |
| Vingeriet AS | Hospitality | 2026 |
| Vito Kongsvinger AS | Real estate | 2011 |
| Vito Kongsvinger Datter AS | Real estate | 2020 |
| Volas AS | Construction | 2013 |
| VTB Vinger Takst Og Byggvurdering AS | Professional & scientific | 2005 |
| Vyron Ventures AS | Administrative & support | 2024 |
| Waalers AS | Administrative & support | 2017 |
| Wangen Regnskap AS | Professional & scientific | 2016 |
| Wangen Skogsdrift AS | Agriculture & fishing | 2019 |
| Waxhouse S&H AS | Other services | 2016 |
| Weis AS | Professional & scientific | 2020 |
| Wictek Eiendom AS | Real estate | 1996 |
| Wictek Holding AS | | 2005 |
| Wildflowermusic AS | Information & communication | 2025 |
| WRX Invest AS | | 2022 |
| Your Tech AS | Administrative & support | 2020 |
| Zummit AS | Administrative & support | 2015 |
| Ånerud Lakk Og Karosseri AS | Other services | 1988 |
| Ånestad Utvikling AS | Real estate | 2020 |
| Åretta Eiendom AS | Real estate | 2023 |
| Åsland Pukk AS | Mining & quarrying | 1992 |
| Ø M Fjeld Byggshop AS | Wholesale & retail | 1984 |
| Ø.M. Fjeld AS | Construction | 2022 |
| Øav Holding AS | Real estate | 2017 |
| Øiseth Holding AS | Construction | 2025 |
| Øiseth Invest AS | Real estate | 2000 |
| Øiseth Montasje AS | Construction | 2025 |
| Ømf Eiendom AS | Real estate | 2018 |
| Ømf Holding AS | Construction | 2005 |
| Ømf Invest Asker Ringerike AS | Construction | 2022 |
| Ømf Invest Evensen & Evensen AS | Construction | 2022 |
| Ømf Invest Hamar AS | Construction | 2022 |
| Ømf Invest Nedre Romerike Oslo AS | Construction | 2022 |
| Ømf Invest Romerike Kongsvinger AS | Construction | 2022 |
| Ømf Invest Wito AS | Construction | 2022 |
| Ømf Invest Østfold AS | Construction | 2022 |
| Ømf Prosjektservice AS | Construction | 2022 |
| Ømf Romerike Kongsvinger AS | Construction | 1965 |
| Øst Eiendom Digerudvegen 1 AS | Real estate | 2017 |
| Øst Eiendom Drift AS | Real estate | 2008 |
| Øst Eiendom Gågata 34 AS | Real estate | 2017 |
| Øst Eiendom Holding AS | Real estate | 2017 |
| Øst Eiendom Holding II AS | Real estate | 2011 |
| Øst Eiendom Jernbanegata 5 AS | Real estate | 2017 |
| Øst Eiendom Oslovegen 105 AS | Real estate | 2017 |
| Øst Eiendom Otervegen 11 AS | Real estate | 2017 |
| Øst Eiendom Otto Wengs Veg 2 AS | Real estate | 2017 |
| Øst Eiendom Otto Wengs Veg 3 AS | Real estate | 2017 |
| Øst Eiendom Sommeroveien 1 AS | Real estate | 2009 |
| Øst Gruppen Holding AS | | 2026 |
| Øst Logistikk AS | Transport & logistics | 2024 |
| Østcom AS | Construction | 2012 |
| Østerdalsporten AS | Real estate | 2006 |
| Østerdalsporten Handelspark AS | Real estate | 2025 |
| Østergaard Invest AS | Wholesale & retail | 2018 |
| Østlands Bygg AS | Construction | 2022 |
| Østlandske Flyttetransport Ans | Transport & logistics | 1999 |
| Østlandsweb AS | Information & communication | 2008 |
| Østre Hauger AS | | 2022 |
| Øve AS | Professional & scientific | 2024 |
| Øverste Søndre AS | Real estate | 2005 |
| Øvre Søndre AS | Real estate | 2001 |
| Øya Invest AS | Wholesale & retail | 2015 |