| Tobo Torild Og Bo Høyer-Pedersen Ans | Wholesale & retail | 1990 |
| Tolvsrød Farve AS | Wholesale & retail | 1992 |
| Tolvsrød Graveservice AS | Construction | 2020 |
| Tommel Invest AS | Financial services | 2005 |
| Tomsbyggservice AS | Construction | 2025 |
| Torgeir Sørby Holding AS | | 2025 |
| Torget 3 Horten AS | Real estate | 2010 |
| Torget 4 Larvik AS | Real estate | 1928 |
| Torget 5 Horten AS | Real estate | 2010 |
| Torød Holding AS | Construction | 2024 |
| Total Drift & Vedlikehold AS | Administrative & support | 2024 |
| Trafikkland AS | Professional & scientific | 2018 |
| Trainingday AS | Education | 2023 |
| Transtek AS | Professional & scientific | 1985 |
| Transtema Sem AS | Construction | 1956 |
| Trethom AS | Real estate | 2015 |
| Trimo Holding AS | Real estate | 2006 |
| Trine Elverum AS | Health & social care | 2020 |
| Trollbo Eiendom AS | Real estate | 2006 |
| Tsjekt AS | Wholesale & retail | 2022 |
| TT Frakt AS | Transport & logistics | 2010 |
| Twi AS | | 2025 |
| Tømrer Glenn Løkeberg AS | Construction | 2022 |
| Tønsberg Design Group AS | Professional & scientific | 2013 |
| Tønsberg Holding AS | Real estate | 2008 |
| Tønsberg Pizza & Grill Tolvsrød AS | Hospitality | 2024 |
| Tønsberg Trefelling AS | Agriculture & fishing | 2025 |
| Ulvika Holding AS | Other services | 2017 |
| Ulvika Invest AS | Other services | 2017 |
| Ulviken Motorsenter AS | Manufacturing | 2009 |
| Unison Regnskap AS | Professional & scientific | 2021 |
| Unizon.No AS | Professional & scientific | 2005 |
| Upsahl Holding AS | Real estate | 2015 |
| Urbalance AS | Professional & scientific | 2015 |
| Utehjelperne AS | Administrative & support | 2025 |
| UTLEIE1 AS | Administrative & support | 2018 |
| Valhall Holding AS | Real estate | 2012 |
| Vallø Bowling AS | Arts & recreation | 2017 |
| Vallø Marina AS | Wholesale & retail | 1998 |
| Vallø Sveis AS | Manufacturing | 2023 |
| Valløveien 19 AS | Real estate | 2014 |
| Valor Capital AS | Real estate | 2025 |
| Valstad Investment Group AS | Real estate | 2020 |
| Varmepumper Og Inneklima AS | Construction | 1999 |
| Veba AS | Administrative & support | 2009 |
| Vedvik-Invest AS | Construction | 2016 |
| Vega Polaris AS | Health & social care | 2021 |
| Velleveien 60 AS | Real estate | 2019 |
| Vennerød-Holding AS | Financial services | 2017 |
| Verdi Consult AS | Real estate | 2009 |
| Vestfold Bygg & Betong Service AS | Construction | 2023 |
| Vestfold Byggservice AS | Construction | 2018 |
| Vestfold Gynekologi AS | Health & social care | 2019 |
| Vestfold Hud- Og Laserklinikk AS | Health & social care | 2018 |
| Vestfold Leie AS | Real estate | 2019 |
| Vestfold Taksering AS | Real estate | 2007 |
| VG Pharma AS | | 2025 |
| Vibmar AS | Education | 2023 |
| Viken Båtservice AS | Transport & logistics | 2011 |
| Vines Forretningsutvikling AS | Real estate | 1989 |
| Vital Drift & Invest AS | Wholesale & retail | 2026 |
| Vital E-Handel AS | Wholesale & retail | 2018 |
| Vital Gruppen Holding AS | Real estate | 2018 |
| Vital Norge AS | Wholesale & retail | 2018 |
| Vof Holding AS | Real estate | 2022 |
| Voltina AS | Professional & scientific | 2025 |
| VT Vaktmester AS | Administrative & support | 2020 |
| Våg Frisør AS | Other services | 2023 |
| Wai Carbon Solutions AS | Energy | 2022 |
| Wai Environmental Solutions AS | Professional & scientific | 2017 |
| Wai Holding AS | Professional & scientific | 2017 |
| Wang Invest II AS | | 2019 |
| Webplatform AS | Information & communication | 2013 |
| Wick Invest AS | | 2025 |
| Wigmore AS | Real estate | 2007 |
| Wilda Holding AS | | 2023 |
| Windingstad AS | Administrative & support | 1995 |
| Wollert-Nielsen Invest AS | Hospitality | 2005 |
| Workit AS | Administrative & support | 2025 |
| Wuwap AS | Administrative & support | 2023 |
| Yanagi Sushi AS | Hospitality | 2013 |
| Yedi Group AS | Information & communication | 2023 |
| Zecond Floor AS | Wholesale & retail | 2006 |
| Zenzor AS | Professional & scientific | 2006 |
| Zeromancer Da | Arts & recreation | 2007 |
| Åstrali Eiendom AS | Real estate | 2016 |
| Økostjerna AS | Wholesale & retail | 2016 |
| Øverland Tekstiler AS | Manufacturing | 2019 |
| Øystein Berg Agenturer AS | Wholesale & retail | 2004 |