| Stålhallen Treningssenter AS | Arts & recreation | 2024 |
| Sveen Holding AS | Real estate | 2012 |
| Sveens Eiendommer AS | Real estate | 2013 |
| Svenstad Holding AS | | 2026 |
| Synnfjell Aktiv Da | Real estate | 2007 |
| Synnfjell Dokksfløy Utmarkslag SA | Administrative & support | 2004 |
| Synnfjell Grustak AS | Mining & quarrying | 2016 |
| Synnfjell Invest AS | | 2024 |
| Synnfjell Massetak AS | Mining & quarrying | 2019 |
| Sønderby Sko AS | Wholesale & retail | 1974 |
| Søreng Drift AS | Construction | 2025 |
| Takseria AS | Professional & scientific | 2025 |
| Takst Innlandet AS | Real estate | 2013 |
| Tanngarden Dokka AS | Health & social care | 2008 |
| Tannlege Jost AS | Health & social care | 2017 |
| Tannlege Ragnhild Sæteren Thorvaldsen AS | Health & social care | 2021 |
| Tenten Holding AS | | 2025 |
| Thagen Holding AS | Financial services | 1991 |
| Thomas Sirirud Drift AS | Professional & scientific | 2023 |
| Thomas Sirirud Holding AS | Professional & scientific | 2023 |
| Thomlevold AS | Manufacturing | 2017 |
| Thor Skogen Transport AS | Transport & logistics | 2007 |
| Timon Renhold AS | Administrative & support | 2021 |
| TL Maskin AS | Wholesale & retail | 2009 |
| Tmcs Holding AS | Construction | 2022 |
| Torvil Trading AS | Transport & logistics | 2025 |
| TP Elektro AS | Construction | 2007 |
| Transportpartner Gods AS | Transport & logistics | 2017 |
| Triangel Utvikling AS | Real estate | 2004 |
| Trim-Mix Fitness AS | Arts & recreation | 2015 |
| Trio Mix Da | Arts & recreation | 1997 |
| TV Bærum AS | Information & communication | 1991 |
| Tverrvassvegen Ba | Real estate | 1951 |
| Tåje Håndverkerservice AS | Construction | 2022 |
| Tåje Invest AS | Construction | 2022 |
| Ulimoen Invest AS | | 2025 |
| Ullsaker Panorama AS | Hospitality | 2019 |
| Ulsaker & Gjeile Bygg AS | Construction | 2013 |
| Ulsakerhaugen Bygg Og Anlegg AS | Construction | 2022 |
| Vaager Innovasjon AS | Professional & scientific | 2000 |
| VBS Maskin AS | Administrative & support | 2020 |
| Vedesbygg AS | Construction | 2015 |
| Vegard Sevilhaug Fysikalske Institutt AS | Health & social care | 2009 |
| Vegen Mæhlum-Aksjøen SA | Real estate | 2023 |
| Veglaget Damhaugen - Bråtåbekken SA | Real estate | 2023 |
| Veglaget Skiaker-Myrbråten SA | Real estate | 1976 |
| Verktøybilen AS | Wholesale & retail | 2013 |
| Vest Torpa Gårds Og Viltkjøtt AS | Manufacturing | 2019 |
| Vest-Torpa Grunneierlag SA | Arts & recreation | 1987 |
| Vest-Torpa Løypelag SA | Arts & recreation | 2015 |
| Vestoppland Byggservice AS | Construction | 2017 |
| Vestoppland Kjøleservice AS | Construction | 2021 |
| Veståsen Holding AS | | 2015 |
| Veståsen Løypelag SA | Arts & recreation | 2007 |
| Veterinær Oddvar Enerstvedt AS | Professional & scientific | 2018 |
| Vidar Eiendom AS | Real estate | 1996 |
| Villmarksbua Dokka Ans | Wholesale & retail | 1999 |
| Vinjarmoen Eiendom AS | Manufacturing | 1986 |
| Vokks AS | Energy | 1998 |
| Vokks Installasjon AS | Construction | 1996 |
| Vokks Kraft AS | Energy | 1996 |
| VVS Installasjon Innlandet AS | Construction | 2022 |
| Våpensmia AS | Manufacturing | 2021 |
| Våpensmia Eiendom AS | Real estate | 2020 |
| Weldcore Nordic AS | Professional & scientific | 2026 |
| Wien Bygg AS | Construction | 2017 |
| Willa Holding AS | Manufacturing | 2017 |
| Würth Industri Norge AS | Wholesale & retail | 2014 |
| Zoobutikken AS | Wholesale & retail | 2024 |
| Øsb Eiendom AS | Real estate | 2013 |
| Østborg Holding AS | Wholesale & retail | 2019 |
| Østdahl Eiendom AS | Real estate | 1990 |
| Østsinnilinna 25 AS | Real estate | 1994 |
| Østsinniåsen Grunneierlag SA | Real estate | 1986 |
| Øystein Ovesen Eiendom AS | Real estate | 2018 |
| Øyvind Hasvold AS | Construction | 2008 |
| Øøø Maskindrift AS | Construction | 2024 |