| Stødig Grunn AS | Real estate | 2020 |
| Sundberg Innvest AS | Real estate | 1987 |
| Sundet Legesenter AS | Health & social care | 2017 |
| Sundet Optikk AS | Wholesale & retail | 2002 |
| Sundgata 11 AS | Real estate | 2019 |
| Svale Analytics AS | Information & communication | 2026 |
| Sverre Hoelsæter AS | Manufacturing | 1987 |
| Svindlandgårdene AS | Real estate | 2009 |
| Søberg Consulting AS | | 2023 |
| Søndre Hestdalsvegen SA | Real estate | 1962 |
| T.Freitag Holding AS | | 2021 |
| Tannlege Vemund Jenssen AS | Health & social care | 2011 |
| Tannperlen AS | Health & social care | 2026 |
| TB Fallet Holding AS | Professional & scientific | 2019 |
| Team Bussreiser AS | Transport & logistics | 2017 |
| Teamtømrer AS | Construction | 2020 |
| Titan Gulv AS | Construction | 2023 |
| Tkb-Bygg AS | Construction | 2020 |
| Tone Tann AS | Health & social care | 2007 |
| Torgan AS | Wholesale & retail | 1989 |
| Trimmen Fysioterapi & Trening AS | Health & social care | 2010 |
| Trond Gobakken Invest AS | | 2021 |
| Truls Holm AS Maskinentreprenør | Construction | 1988 |
| Trygg Barndom AS | Health & social care | 2024 |
| Trygg Brannvern AS | Wholesale & retail | 2025 |
| Trygg Partner AS | Wholesale & retail | 2014 |
| Tømrer Martinsen AS | Construction | 2015 |
| Ugnesi Transport AS | Transport & logistics | 2026 |
| Ulverud Mur Og Flis AS | Construction | 2017 |
| Urmaker Sindsen AS | Wholesale & retail | 2024 |
| V F 17 Eiendom AS | Real estate | 2019 |
| Valentra Media AS | Professional & scientific | 2026 |
| Varig Bolig AS | Real estate | 2021 |
| Varnaveien 33 Eiendom AS | Real estate | 2014 |
| Vegard Itland Holding AS | | 2024 |
| Vemovent AS | Construction | 2026 |
| Venger Fysioterapi AS | Health & social care | 2014 |
| Veronica Fløtten AS | Wholesale & retail | 2022 |
| Veterinær Gulbrandsen Gruben AS | Professional & scientific | 2025 |
| Viktoria Renhold AS | Administrative & support | 2018 |
| Vilberg Legesenter Da | Health & social care | 2010 |
| Vilthagen AS | Wholesale & retail | 2020 |
| Vincompaniet AS | Wholesale & retail | 2014 |
| Vip Transport AS | Transport & logistics | 2024 |
| Vision Technology Grid AS | Information & communication | 2003 |
| VNP Holding AS | Information & communication | 2019 |
| Vorma Eiendom AS | Real estate | 2015 |
| Vorma Varme AS | Other services | 2025 |
| Vormavegen Eiendom AS | Real estate | 2016 |
| Vormen AS | | 2021 |
| Walsowork AS | Professional & scientific | 2014 |
| Webvibe AS | Professional & scientific | 2025 |
| Wergelandshaugen AS | Real estate | 2017 |
| Wergelandskvartalet AS | Real estate | 2016 |
| Westmark Holding AS | Real estate | 2020 |
| Wolfram AS | Agriculture & fishing | 2014 |
| Worthforce AS | Health & social care | 2019 |
| Wunjo AS | Real estate | 2018 |
| Xl-Bygg Eidsvoll AS | Wholesale & retail | 2020 |
| Xl-Bygg Eidsvoll Da | Wholesale & retail | 2020 |
| Y.Co.Ai AS | Professional & scientific | 2026 |
| Yako Bygg AS | Construction | 2026 |
| Zeze Artistry AS | Arts & recreation | 2025 |
| Økonomi Consult Ans | Professional & scientific | 1985 |
| Økonomi Consult AS | Professional & scientific | 1993 |
| Ønr Drift AS | Real estate | 2017 |
| Østberg Eiendom Og Handel AS | Administrative & support | 1994 |
| Øvre Romerike Holding AS | Real estate | 2011 |
| Øvre Romerike Rekruttering AS | Administrative & support | 2026 |
| Øgaard & Wilhelmsen A/S | Other services | 1988 |