| Transtech AS | Wholesale & retail | 1979 |
| Transtech. Holding AS | Wholesale & retail | 1988 |
| Traumepsykologen AS | Health & social care | 2023 |
| Tredata AS | Professional & scientific | 2025 |
| Treschow-Fritzøe Holding 2K AS | Financial services | 2018 |
| Treschow-Fritzøe Holding AS | Wholesale & retail | 2018 |
| Treschows Gate AS | | 2024 |
| TRETOPP1 AS | Administrative & support | 2016 |
| Tretoppen Service AS | Administrative & support | 2022 |
| Trimakk Ans | Wholesale & retail | 1988 |
| Trimakk Sør Ans | Wholesale & retail | 1988 |
| Troja AS | Real estate | 2000 |
| Troja Investment AS | Professional & scientific | 2005 |
| Troll Elementer AS | Manufacturing | 2024 |
| Troll Vindufabrikk AS | Wholesale & retail | 2022 |
| Trollborg Eiendom AS | Real estate | 2022 |
| Trollborg Eiendom Vestfold AS | Real estate | 1997 |
| Trollborg Invest AS | Real estate | 2004 |
| Trollsteinen Barnehage SA | Education | 1989 |
| Trollsås Holding AS | | 2024 |
| Trollsås Og Solberg Ans | Construction | 2001 |
| Trollåsveien 21 AS | Real estate | 2009 |
| Trond Bjerke AS | Professional & scientific | 2012 |
| Trusten AS | Real estate | 2017 |
| TRW Bygg AS | Construction | 2025 |
| Trygg Seilas AS | Transport & logistics | 2020 |
| Trygg Takst AS | Real estate | 2013 |
| Trytei Holding AS | | 2021 |
| Trøst Eiendom AS | Real estate | 2000 |
| TS Gruppen AS | Manufacturing | 2016 |
| Turbo Invest AS | Real estate | 1988 |
| Turik Animasjon AS | Information & communication | 1988 |
| Turngutt AS | | 2023 |
| Tuul Holding AS | Manufacturing | 2020 |
| Tveråen Holding AS | | 2026 |
| Tvetene Blomst AS | Wholesale & retail | 2005 |
| Tvetene Blomster Senter AS | Wholesale & retail | 1993 |
| Tvetene Gartneri AS | Agriculture & fishing | 1993 |
| Tvetene Gård AS | Agriculture & fishing | 2005 |
| Tveter & Lund AS | Construction | 1985 |
| Tveter & Lund Holding AS | Construction | 2020 |
| Tveter Eiendom AS | Real estate | 2008 |
| Twin Sandwich AS | Information & communication | 2025 |
| Tyme AS | Real estate | 2005 |
| Tyrdal Holding AS | | 2021 |
| Treschow-Fritzøe AS | Wholesale & retail | 1986 |
| Tømmeråsen Eiendom AS | Real estate | 2025 |
| Tømrer Aksel B. Lindhjem AS | Construction | 2025 |
| Tømrer Simen Skinmo AS | Real estate | 2014 |
| Tømrerfirma Dac Van Duong AS | Construction | 2020 |
| Tømrersvenn Anders Hagtvedt AS | Construction | 2016 |
| Tønderveien 2 AS | Real estate | 2021 |
| Tønsberg Granit AS | Mining & quarrying | 1970 |
| Uab Good House | Real estate | 2016 |
| Ubiquitous AS | Information & communication | 2017 |
| Ugle Holding AS | Wholesale & retail | 2005 |
| Ulefossenteret AS | Real estate | 2002 |
| Ullern Bygg Vestfold AS | Construction | 2023 |
| Ullinveien AS | Real estate | 1994 |
| Ungumrah AS | Administrative & support | 2024 |
| Unite Performance Larvik AS | Arts & recreation | 2014 |
| Universal Exports VWP AS | Wholesale & retail | 2017 |
| Unsaco AS | Wholesale & retail | 2004 |
| Up to Date - Larvik Ans | Manufacturing | 1989 |
| Upit AS | | 2022 |
| Utd AS | Professional & scientific | 2008 |
| Uteparadis AS | Wholesale & retail | 2023 |
| Uthavn Holding AS | Financial services | 2014 |
| Utstyrspesialisten AS | Wholesale & retail | 2021 |
| Vadskjæret AS | Real estate | 1999 |
| Vadskjæret Hypnoseterapi AS | Health & social care | 2021 |
| Vaktmester Per AS | Administrative & support | 2021 |
| Valberggrenda 20 Stokke AS | Real estate | 2018 |
| Valhall AS | Real estate | 2010 |
| Valhalla Sport AS | Wholesale & retail | 2018 |
| Valorem AS | | 2018 |
| Valutec AB Nuf | Wholesale & retail | 2010 |
| Van Delay AS | | 2021 |
| Var Invest AS | Financial services | 2002 |
| Vardeveien 14 AS | Real estate | 2017 |
| Varetransport Express AS | Transport & logistics | 2023 |
| Vaskeservice Larvik AS | Administrative & support | 2019 |
| Vatakeråsen Tomteselskap AS | Real estate | 2018 |
| Vatne Sjømat AS | Manufacturing | 2018 |
| VDS Flis Og Byggservice AS | Construction | 2026 |
| Vebergsgate 4 AS | Real estate | 2022 |
| Ved Varming AS | Agriculture & fishing | 2023 |
| Vedå Bygg AS | Construction | 2019 |
| Veggen Invest AS | Transport & logistics | 2005 |
| Vei Og Trafikksikring AS | Transport & logistics | 2023 |
| Veidekke Logistikkbygg AS | Construction | 1994 |
| Vekt Eiendom AS | Real estate | 2007 |
| Venemyr Holding AS | | 2026 |
| Vepa AS | Construction | 1993 |
| Verdiprosjekt AS | | 2018 |
| Verkstedgrossisten Larvik AS | Wholesale & retail | 2025 |
| Verningen Bygg Og Utleie AS | Real estate | 2016 |
| Verningen Eiendom AS | Real estate | 2015 |
| Vertorama AS | Real estate | 2019 |
| Vestervik AS | Real estate | 2018 |