| VMF Holding AS | Professional & scientific | 2025 |
| Voga Production AS | Professional & scientific | 2024 |
| Voldengen Invest AS | Real estate | 2007 |
| Volt Design AS | Professional & scientific | 2019 |
| Vormstuguskiftet AS | Real estate | 2025 |
| Vt-Holding AS | Construction | 2018 |
| VTV Finans AS | Real estate | 2018 |
| Vårstien Utvikling AS | Real estate | 2010 |
| Waha Invest AS | Information & communication | 2021 |
| Wakeup Living AS | Wholesale & retail | 2010 |
| Walheim AS | Construction | 2007 |
| Wallin & Karlsson Holding AS | Manufacturing | 2025 |
| Wallin Photo AS | Professional & scientific | 2025 |
| Wang Eiendom Gjøvik Da | Real estate | 2013 |
| Wang Karosseri Og Antirust AS | Other services | 2013 |
| Waso Ventures AS | | 2025 |
| Wau I/O AS | Information & communication | 2015 |
| Webdesign AS | Information & communication | 2012 |
| Welhavensgt. 1 AS | Real estate | 2009 |
| Wergelandsgate 9 AS | Real estate | 2001 |
| Westlie Dental Holding AS | Health & social care | 2011 |
| White Swan Interactive AS | Information & communication | 2026 |
| Wima Future AS | Real estate | 2020 |
| Wima Holding AS | Financial services | 2018 |
| Wine Eazy AS | Wholesale & retail | 2012 |
| Witpro Holdings AS | Professional & scientific | 2020 |
| Wobbes AS | | 2025 |
| Workapy Da | Information & communication | 2009 |
| Workly AS | Information & communication | 2026 |
| Wpty AS | Real estate | 2020 |
| XT Mjøsa AS | Arts & recreation | 2012 |
| Ygg Holding AS | Real estate | 2021 |
| Zabin AS | Real estate | 2023 |
| Zipper AS | Professional & scientific | 2019 |
| Zipto AS | | 2023 |
| Åker Utvikling a AS | Real estate | 2018 |
| Åker Utvikling B AS | Real estate | 2018 |
| Åker Utvikling C AS | Real estate | 2018 |
| Åker Utvikling D AS | Real estate | 2018 |
| Åker Utvikling E AS | Real estate | 2018 |
| Åker Utvikling F AS | Real estate | 2018 |
| Åker Utvikling G AS | Real estate | 2018 |
| Åker Utvikling H AS | Real estate | 2018 |
| Åker Utvikling I AS | Real estate | 2024 |
| Åse Brennbakken AS | Financial services | 2005 |
| Ø. Totenv. 128 AS | Real estate | 2013 |
| Ø. Totenv. 130 AS | Real estate | 2006 |
| Ørja.No AS | | 2025 |
| Øst-Tek Østlandske Byggeteknikk AS | Professional & scientific | 2014 |
| Østby Gård AS | Real estate | 2021 |
| Østby Gårdsbarnehage AS | Education | 2022 |
| Østeng Consulting AS | | 2026 |
| Østlandet Eiendomsmegling AS | Real estate | 2019 |
| Østlandet Trefiberisolering AS | Construction | 2021 |
| Østlandske Kolonialagenturer AS | Wholesale & retail | 1991 |
| Øtv Holding AS | | 2020 |
| Øv Holding AS | | 2025 |
| Øveraasen AS | Manufacturing | 2003 |
| Øveraasen Holding AS | Manufacturing | 2005 |
| Øverbygdsvegen Eiendom AS | Real estate | 2002 |
| Øverli Butikkdrift AS | Wholesale & retail | 2025 |
| Øvermarka 16 Furnes AS | Real estate | 2007 |
| Øvre Torvgata 7/9 Gjøvik AS | Real estate | 2017 |
| Øvre Torvgate 24 B AS | Real estate | 2000 |
| Øvre Torvgate 3 Gjøvik AS | Real estate | 2021 |
| Øvre Torvgt 30 Holding AS | Real estate | 2024 |
| Øyer Eiendom AS | Real estate | 1998 |
| Øyhus Holding AS | Financial services | 2005 |