| Step Forward AS | Transport & logistics | 2006 |
| Sthg 73 AS | Real estate | 2021 |
| Storgata 13 Jevnaker AS | Real estate | 2022 |
| Strøm AS | Wholesale & retail | 1994 |
| Strømmen Industri AS | Real estate | 1995 |
| Subaru Norge AS | Wholesale & retail | 1971 |
| Sublime Wines AS | Wholesale & retail | 2022 |
| Summit Wines AS | Wholesale & retail | 2022 |
| Sundquist Bygg AS | Wholesale & retail | 2006 |
| Svenssons Kiropraktikk AS | Health & social care | 2013 |
| Symposium Wines AS | Wholesale & retail | 2009 |
| Søndre Strandbråtan Vann Og Avløp Drift SA | Water & waste | 2020 |
| Søran AS | Manufacturing | 1982 |
| T.A.A. Holding AS | | 2020 |
| Ta Larsen Invest AS | | 2025 |
| Takseringstjenester AS | Real estate | 2014 |
| Tandberg Thorvaldsen Invest AS | | 2026 |
| Tannlege Bård Pande AS | Health & social care | 2006 |
| Taxi Nittedal Romerike AS | Transport & logistics | 2024 |
| Tekn. Byggingeniør AS | Construction | 2023 |
| Teknisk Konsult AS | Real estate | 2015 |
| Tem Kapital AS | | 2022 |
| Terg Holding AS | | 2025 |
| The Gate AS | Real estate | 2018 |
| The Holmens Velvære AS | Other services | 2024 |
| The Norwegian Family AS | | 2022 |
| Thjelset Holding AS | | 2025 |
| Tidløse Øyeblikk AS | Professional & scientific | 2024 |
| Tipptopp AS | Construction | 2024 |
| Tobbe Banken Holding AS | | 2024 |
| Tomli AS | Manufacturing | 2024 |
| Torkildsen AS | Professional & scientific | 2023 |
| Torkildsen Holding AS | Professional & scientific | 2023 |
| Totru Holding AS | Manufacturing | 2003 |
| Tracinvent AS | Professional & scientific | 2020 |
| Trangerud AS | Wholesale & retail | 1996 |
| Tree of Pets AS | Wholesale & retail | 2019 |
| Trens AS | Other services | 2014 |
| Truck-Line AS | Wholesale & retail | 1995 |
| Tunap Norge AS | Wholesale & retail | 2004 |
| Ullerlien Holding AS | Real estate | 2021 |
| Unes AS | Information & communication | 2025 |
| Unibak AS | Wholesale & retail | 1990 |
| Unilamp Norden AS | Wholesale & retail | 2008 |
| Uniteam Project AS | Construction | 2022 |
| Unitech IT AS | Information & communication | 2013 |
| United Holding AS | Hospitality | 2019 |
| Utsikten Selskapslokale AS | Real estate | 2017 |
| Uvv 17 AS | Real estate | 2025 |
| Varde Fornyelse AS | Construction | 2026 |
| Varia Eiendom AS | Real estate | 2004 |
| Varia Holding AS | Manufacturing | 2005 |
| Varia Mek Verksted AS | Manufacturing | 1998 |
| Varme & Kuldeteknikk AS | Construction | 2016 |
| Vectura AS | Wholesale & retail | 1995 |
| Vektas Da | Administrative & support | 2012 |
| Velion AS | Hospitality | 2025 |
| Vendcomatic AS | Arts & recreation | 1978 |
| Ventilteknikk AS | Professional & scientific | 2017 |
| Venturenord AS | Administrative & support | 2025 |
| Vestand AS | Construction | 2024 |
| Veterinær Radiologene AS | Professional & scientific | 2021 |
| VFR Invest Nuf | | 2019 |
| Vikar Optikk AS | Administrative & support | 2006 |
| Viken Bilglass AS | Other services | 2023 |
| Vikingstrength AS | Wholesale & retail | 2018 |
| Vingruppen AS | Wholesale & retail | 2012 |
| Vinordia AS | Wholesale & retail | 2002 |
| Vinuniq AS | Wholesale & retail | 2007 |
| Vip Cars AS | Administrative & support | 2023 |
| Visionary Da | Wholesale & retail | 2018 |
| Vista Norge AS | Wholesale & retail | 2002 |
| Viva Sport AS | Professional & scientific | 2021 |
| VVS Finans AS | Professional & scientific | 1989 |
| Våge Kapital AS | | 2024 |
| Web Design AS | Information & communication | 1996 |
| Weber Machinery AS | Manufacturing | 2018 |
| Wilfa Danmark | Manufacturing | 2012 |
| Wilfa Sverige AB | Wholesale & retail | 2015 |
| Willersrud Holding AS | Real estate | 2006 |
| Willy Gjertsen AS | Wholesale & retail | 1967 |
| Wongraven Wines AS | Wholesale & retail | 2012 |
| Würth Modyf AS | Wholesale & retail | 1990 |
| Würth Norge AS | Wholesale & retail | 1973 |
| Yo-Business Group AS | Professional & scientific | 2023 |
| Øfn Holding AS | | 2024 |
| Ømf Nedre Romerike Oslo AS | Construction | 2015 |
| Ørpen Eiendom Invest AS | Real estate | 2013 |
| Øst Eiendomskapital AS | Real estate | 2025 |
| Øverbye Holding AS | Wholesale & retail | 2006 |
| Øverstad Handel AS | Wholesale & retail | 2025 |