| Tysk Bruktbil & Deler AS | Wholesale & retail | 2021 |
| Tømrer Kameratene Bygg AS | Construction | 2020 |
| Tømrerfirma Frivik Og Borgen AS | Construction | 2011 |
| Uab Nolt | Construction | 2020 |
| Uab Novega Nuf | Construction | 2009 |
| Uas AS | Construction | 2025 |
| Ullensaker Biloppretting AS | Other services | 2005 |
| Ullensaker Eiendomsutvikling AS | Construction | 2015 |
| Ullensaker Eiendomsutvikling Holding AS | Construction | 2014 |
| Ullensaker Renholdsteknikk AS | Administrative & support | 2010 |
| Umais Transport AS | Transport & logistics | 2025 |
| Unisot AS | Information & communication | 2017 |
| Unisot Holding AS | Information & communication | 2021 |
| Urban Motors AS | Wholesale & retail | 2026 |
| Vaaler Trening & Livsstil AS | Education | 2025 |
| Vantor Renhold AS | Administrative & support | 2017 |
| Vaskhunden AS | Other services | 2026 |
| Vendepunkt AS | Health & social care | 2026 |
| Vestkysten Bygg AS | Construction | 2016 |
| Veterinær Gunnar T Sekse AS | Professional & scientific | 2006 |
| Veterinær Henriette Eriksen AS | Professional & scientific | 2006 |
| VG Consult AS | Professional & scientific | 2021 |
| Viconsult AS | Professional & scientific | 2020 |
| Viken Marketing Da | Professional & scientific | 2023 |
| Viken Tømrer AS | Construction | 2024 |
| Villa Valhall Da | Hospitality | 2009 |
| Viva 4 You Nuf | Professional & scientific | 2021 |
| VPC AS | Wholesale & retail | 2016 |
| VVS Bad Og Bolig AS | Construction | 2024 |
| Wamo Holding AS | | 2023 |
| Wangensten Handel AS | Real estate | 2020 |
| Wanida & Sophit AS | Other services | 2025 |
| Wazza Holding AS | | 2026 |
| Westbye Regnskap Og Råd AS | Professional & scientific | 2021 |
| Wethal TR Logistikk AS | Transport & logistics | 2023 |
| Wethal Økonomi AS | Professional & scientific | 2020 |
| Wethalsøgard AS | Administrative & support | 2025 |
| Wevi AS | Real estate | 2012 |
| Wilberg Utleie AS | Real estate | 2020 |
| Willersrud Eiendom- Og Vaktmesterservice AS | Administrative & support | 2012 |
| Winge-Thorby Invest AS | | 2024 |
| Xenit Consulting AS | Information & communication | 2023 |
| Xenit Holding AS | Information & communication | 2023 |
| Z-Audio AS | Arts & recreation | 2005 |
| Zandi Invest AS | Health & social care | 2023 |
| Zebrafish AS | Hospitality | 2014 |
| Zebrafish Mip AS | Hospitality | 2023 |
| Zen Harmony Spa AS | Other services | 2024 |
| ZR Invest AS | | 2023 |
| Øbe AS | Construction | 2018 |
| Øtb Holding AS | | 2021 |
| Øvre Romerike Trafikkskole AS | Education | 2013 |
| Øyvind Foss Holding AS | Agriculture & fishing | 2023 |