| Strømmen Trend Jewellery & Watches AS | Wholesale & retail | 2019 |
| Svartdahl Eiendom AS | Real estate | 2026 |
| Svenner Invest AS | | 2010 |
| Svenner Maritim AS | Wholesale & retail | 2026 |
| Synergi Eiendomsutvikling AS | Real estate | 2025 |
| Synergi Elektro AS | Construction | 2012 |
| Synergi Holding AS | | 2023 |
| Skreppestadveien 9 ANS | Real estate | 1988 |
| T. Olsen-Nalum AS | Education | 2021 |
| Tanggaard AS | Construction | 2011 |
| Tanggård Vann- Og Avløpslag SA | Water & waste | 2012 |
| Tannlege Johannessen Holding AS | Health & social care | 2016 |
| Tannlege Stavern AS | Health & social care | 2020 |
| Tarven Invest AS | Financial services | 2005 |
| Teb Invest AS | | 2025 |
| Tema Havfiske Ans | Transport & logistics | 2000 |
| Terje Edvardsen AS | Real estate | 1998 |
| Termografi Og Måleteknikk AS | Professional & scientific | 1988 |
| TH Bil AS | Other services | 2014 |
| TH Johansen Holding AS | Real estate | 2022 |
| The Grill Pit AS | Hospitality | 2017 |
| The Grill Pit Holding AS | Hospitality | 2022 |
| Timatuthe Holding AS | Financial services | 2005 |
| Timla AS | Information & communication | 2025 |
| Tinky AS | Real estate | 2014 |
| Tisler AS | | 2023 |
| Tjøllingveien 520 AS | Real estate | 2022 |
| TMC Holding AS | Real estate | 2005 |
| Tolstrupveien 9 AS | Real estate | 2020 |
| Trae AS | Professional & scientific | 2019 |
| Trio Helse Og Trening AS | Arts & recreation | 2016 |
| Tvetene Holding AS | | 2020 |
| Tømrer Blomquist AS | Construction | 2014 |
| Uglehus Holding AS | | 2026 |
| Ulåsveien 6 AS | Real estate | 2021 |
| Unda Redang AS | Professional & scientific | 2024 |
| Unmanned Holding AS | | 2023 |
| Urkilden AS | Information & communication | 1989 |
| Utopia Eiendom AS | Real estate | 2015 |
| Utvitek AS | Professional & scientific | 1994 |
| Vardaas AS | Transport & logistics | 1998 |
| Vardesvingen 13 AS | Real estate | 2026 |
| Vardeveien 15 AS | Real estate | 1990 |
| Vassfarsameien Ans | Agriculture & fishing | 1995 |
| Vemo Invest AS | | 2021 |
| Veranto AS | Professional & scientific | 2012 |
| Vess Vestfold Service-Senter AS | | 1980 |
| Vestfold Rør & Gass AS | Construction | 2015 |
| Vestre Naverfjorden Vann- Og Avløpslag SA | Water & waste | 2015 |
| Vinkooperativet AS | Wholesale & retail | 2021 |
| Vitality Innovation AS | Wholesale & retail | 2004 |
| Vårodden Holding AS | | 2023 |
| Waale Holding AS | Construction | 2024 |
| Wanna Thai Takeaway AS | Hospitality | 2017 |
| Wassilioff Eiendom AS | Real estate | 2006 |
| Wassilioff Hotel AS | Hospitality | 2012 |
| Wigør Elektro AS | Construction | 2025 |
| Wilson Holding AS | | 2019 |
| Wionetic AS | Manufacturing | 2018 |
| X2 Works AS | Information & communication | 2012 |
| Xo Climatech AS | Construction | 2018 |
| Ørneblikk AS | Wholesale & retail | 2015 |
| Østre Neset AS | Real estate | 2017 |
| Øy 3 Bygg C AS | Construction | 2022 |