| TLG Invest AS | Wholesale & retail | 2022 |
| TM & Co Invest AS | | 2026 |
| TNB Borg AS | Wholesale & retail | 2026 |
| Tobli Holding AS | Professional & scientific | 2018 |
| Tolketråd AS | Professional & scientific | 2024 |
| Tom Heine Bjercke Eiendom AS | Real estate | 1989 |
| Top Transport AS | Transport & logistics | 2026 |
| Torger Ådalen Holding AS | | 2023 |
| Torget Eiendom Og Invest AS | Real estate | 2016 |
| Torget Legesenter Sarpsborg AS | Health & social care | 2013 |
| Torget Tannhelse Sarpsborg AS | Health & social care | 2016 |
| Torggata 8 AS | Real estate | 2010 |
| Torggaten 3 AS | Real estate | 1957 |
| Torggt. 9 Eiendom AS | Real estate | 2008 |
| Torp Tekstil AS | Wholesale & retail | 2001 |
| Torvaldslyst 1 AS | Real estate | 2024 |
| Torvbanen 9 AS | Real estate | 2021 |
| TORVET-5 AS | Real estate | 2015 |
| Torvstikkeren 22 AS | Real estate | 2021 |
| Torø Invest AS | Real estate | 2019 |
| Total Konsept AS | Construction | 2017 |
| Totalbistand AS | Administrative & support | 2021 |
| Totalmedia AS | Professional & scientific | 2009 |
| Tourcompass | Administrative & support | 2025 |
| TPK Eiendom AS | Real estate | 2025 |
| Transitx AS | Transport & logistics | 2026 |
| Transport Solution AS | Transport & logistics | 2022 |
| Treasures AS | Arts & recreation | 2014 |
| Treasures Publishing AS | Professional & scientific | 2024 |
| Treelement Øst AS | Construction | 1997 |
| Trekanten Ans | Wholesale & retail | 1986 |
| Trondhjem Electronic Labels | Wholesale & retail | 1998 |
| Truestory AS | Arts & recreation | 2016 |
| Trygg AS | Professional & scientific | 2022 |
| Trygg-Eiendom AS | Professional & scientific | 2025 |
| Trygve Monstad AS | Wholesale & retail | 1980 |
| Tså Holding AS | Health & social care | 2023 |
| Tubus Barnehage AS | Education | 2022 |
| Tubus Barnehage Eiendom AS | Real estate | 2014 |
| Tui Wok AS | Hospitality | 2001 |
| Tune Apotek AS | Wholesale & retail | 2023 |
| Tune Bilservice AS | Other services | 1993 |
| Tune Byggservice AS | Construction | 2012 |
| Tune Eiendomsservice AS | Construction | 2012 |
| Tune Holding AS | Construction | 2012 |
| Tune Karosseri AS | Other services | 1978 |
| Tune Regnskaps Consult AS | Professional & scientific | 2004 |
| Tunebygg AS | Administrative & support | 2019 |
| Tunejordet Trening AS | Arts & recreation | 2026 |
| Tuneveien 10 AS | Real estate | 2015 |
| Tuneveien 100 AS | Real estate | 2010 |
| Tuneveien 29 AS | Real estate | 2008 |
| Tuneveien 4 AS | Real estate | 2019 |
| Tuneveien 8 AS | Real estate | 2022 |
| Tva Teknikk AS | Professional & scientific | 2016 |
| Tveterhytta Barnehage AS | Education | 2022 |
| Twinco AS | | 2020 |
| Tyler Olson AS | | 2015 |
| Tyreng's Spa Og Vaktmestertjenester AS | Real estate | 2016 |
| Tzatziki Pizzeria Da | Hospitality | 2009 |
| Ulf Martin Invest AS | | 2022 |
| Ulstensvei 2 AS | Real estate | 2007 |
| Unique Servicepartner AS | Other services | 2017 |
| Urmaker Torp AS | Other services | 2019 |
| Utne Elektro AS | Construction | 2018 |
| Utsikt Eiendom AS | Real estate | 1988 |
| V Dental AS | Health & social care | 2022 |
| Vacation Rentals AS | Hospitality | 2023 |
| Vaffelbua AS | Hospitality | 2020 |
| Vainu Norway AS | Information & communication | 2016 |
| Vaktiv Takst - Inneklima Og Sikkerhetsrådgivning AS | Professional & scientific | 1999 |
| Vaktmester Kenneth AS | Administrative & support | 2024 |
| Valaskjold Eiendom AS | Real estate | 2012 |
| Valestrand Holding AS | | 2026 |
| Vardeveien Handel AS | Real estate | 2020 |
| Vatvedt Næring AS | Real estate | 2020 |
| Vatvedtklinikken AS | Health & social care | 2011 |
| Vector Financial Systems AS | Professional & scientific | 1997 |
| Vecu AS | Other services | 2025 |
| Vedekspressen AS | Wholesale & retail | 2024 |
| Velstyrt AS | Construction | 2016 |
| Velvet Eiendom AS | Real estate | 2001 |
| Venner Sarpsborg AS | Other services | 2011 |
| Ventidue Eiendom AS | Real estate | 2020 |
| Verdi Media Norge AS | Information & communication | 2017 |
| Vesir AS | Professional & scientific | 2018 |
| Vestengveien Eiendomsutvikling AS | Real estate | 2005 |
| Vestre Vei Eiendom AS | Real estate | 2005 |
| Vestre Vei Takst AS | Professional & scientific | 2026 |
| Vetaberget AS | Real estate | 2018 |
| Vetaberget Utvikling AS | Real estate | 2019 |
| Viewing Security Systems Nuf | Construction | 2006 |
| Vig Holding AS | Real estate | 2012 |
| Vigeng AS | | 2024 |
| Vigre Invest AS | Financial services | 2014 |
| Vihi Invest AS | Administrative & support | 2003 |
| Viken Media AS | Information & communication | 2014 |
| Viken Våtrom Og Overflateteknikk AS | Construction | 2025 |
| Viking Filtration AS | Professional & scientific | 2011 |
| Viking Frisør AS | Other services | 2020 |