| Trefelling Innlandet AS | Agriculture & fishing | 2021 |
| Trigo Tech AS | Health & social care | 2018 |
| Trsoftware AS | Information & communication | 2012 |
| Trura AS | Wholesale & retail | 2005 |
| Trylletein Da | Professional & scientific | 2013 |
| Trysil Bilpleie Da | Other services | 2008 |
| Trysilvegen 256 AS | Real estate | 2002 |
| TS Consulting AS | Professional & scientific | 2022 |
| TS Diamond Invest AS | | 2020 |
| Tt's Mur Og Flis Innlandet AS | Construction | 2023 |
| Tunet Arbeid & Karriere AS | Health & social care | 2017 |
| Tunet Elverum AS | Professional & scientific | 1991 |
| Tunet Utvikling AS | Professional & scientific | 2017 |
| Tyro Bidco AS | Administrative & support | 2022 |
| Tyro Midco AS | Administrative & support | 2022 |
| Tyro Topco AS | Administrative & support | 2022 |
| Tømrermester Schulstad AS | Construction | 2026 |
| Tømte Holding AS | Hospitality | 2005 |
| Ulvebne AS | | 2023 |
| Universal Renhold AS | Administrative & support | 2016 |
| Uno Marine AS | Manufacturing | 2013 |
| Uno Marine Eiendom AS | Real estate | 2020 |
| Uno Marine Holding AS | Manufacturing | 2020 |
| Uroderma AB Nuf | Health & social care | 2015 |
| Uslugi Remontowo-Budowlane Marek Grosch Nuf | Construction | 2009 |
| Uteng Eiendom AS | Real estate | 2012 |
| Uthushagen Plan AS | Professional & scientific | 2014 |
| Utsikten 360 AS | Real estate | 2020 |
| V.Bårdseng Rettesøm - Galleri AS | Manufacturing | 2022 |
| Vaktmesterservice Innlandet AS | Administrative & support | 2014 |
| Vaktmesterservice Innlandet SA | Administrative & support | 1992 |
| Vangen Og Tofte Da | Other services | 1994 |
| Vare-Taxi Elverum AS | Transport & logistics | 1988 |
| Varmepumpe . AS | Construction | 2023 |
| Varmepumpe AS | Construction | 2023 |
| Varmepumpe H AS | Construction | 2023 |
| Vedlikehold Innlandet AS | Real estate | 2025 |
| Vedvik Holm Invest AS | | 2024 |
| Veksthuset Holding AS | Professional & scientific | 2023 |
| Vestad Handelspark AS | Real estate | 2020 |
| Vestad Næringseiendom AS | Manufacturing | 2017 |
| Vestin AS | Wholesale & retail | 1986 |
| Vestmo Eiendom AS | Real estate | 2009 |
| Veterinærhuset AS | Professional & scientific | 2011 |
| Via Invest AS | Financial services | 2021 |
| Vikingbygg AS | Construction | 1994 |
| Vindheia Bygg AS | Construction | 2015 |
| Vingelsgaard Invest AS | Financial services | 2017 |
| Vipp AS | Health & social care | 2023 |
| Virkestransport Øst AS | Transport & logistics | 1988 |
| Vises AS | Hospitality | 2022 |
| Vitamin Torg Ans | Wholesale & retail | 2002 |
| VK Bygg Innlandet AS | Construction | 2025 |
| VVS Øst AS | Construction | 2021 |
| VVS Øst Eiendom AS | Real estate | 2018 |
| Vyer Eiendom AS | Real estate | 2019 |
| Winsents VVS AS | Construction | 2017 |
| Wood Holding AS | Wholesale & retail | 2014 |
| Wood Shop AS | Wholesale & retail | 2014 |
| Yc Amundrud AS | Construction | 2020 |
| Yc Eiendom AS | Real estate | 2016 |
| Yc Holding AS | Real estate | 2016 |
| Yc Invest AS | | 2022 |
| Ydalir Eiendom AS | Mining & quarrying | 1990 |
| Ydalirtunet AS | Real estate | 2021 |
| Yes! Holding AS | Education | 2020 |
| Yildiz AS | Hospitality | 2022 |
| Yngven's Servicetjenester AS | Construction | 2022 |
| ZOO-1 Norge AS | Wholesale & retail | 2017 |
| Åsgarden AS | Real estate | 1999 |
| Åsheim Eiendomsutvikling AS | Real estate | 2018 |
| Åsto AS | | 2005 |
| Éndre AS | Wholesale & retail | 2023 |
| Øbv-Holding AS | Real estate | 2019 |
| Øien Eiendom AS | Real estate | 2002 |
| Øk Nomi AS | Professional & scientific | 2025 |
| Økoråd Elverum & Rena AS | Professional & scientific | 1987 |
| Østbye Eiendom AS | Manufacturing | 1987 |
| Østerdal Eiendom Da | Real estate | 2000 |
| Østerdalen Invest AS | Financial services | 2005 |
| Østhagen Miljøtransport AS | Transport & logistics | 2018 |
| Østlandske Blikkenslagerverksted AS | Construction | 2019 |
| Østlandske Byggservice AS | Construction | 2002 |
| Østlandske Lettmetall AS | Manufacturing | 1979 |
| Østlandske Montasje AS | Construction | 2017 |
| Østli AS | Other services | 2009 |
| Østmoehjørnet AS | Hospitality | 2025 |
| Østre Grundset AS | Real estate | 2021 |
| Øverbys Regnskapskontor AS | Professional & scientific | 2001 |
| Øyvind Østbye Holding AS | | 2023 |