| Tjøme El-Installasjon AS | Construction | 2001 |
| Tjøme Formidling AS | Wholesale & retail | 2023 |
| Tjøme Gravedrift AS | Construction | 2017 |
| Tjøme Helseklinikk Da | Health & social care | 2016 |
| Tjøme Hest Og Helse AS | Education | 2023 |
| Tjøme Holding AS | Real estate | 2021 |
| Tjøme Invest AS | Real estate | 2016 |
| Tjøme Kolonial AS | Wholesale & retail | 2016 |
| Tjøme Maskin AS | Administrative & support | 2016 |
| Tjøme Taxi AS | Transport & logistics | 2019 |
| Tjøme Utvikling AS | Real estate | 2022 |
| Tjøme Varme AS | Construction | 2023 |
| Tjøme Video Ans | | 1990 |
| Tjøme Vingård Da | Manufacturing | 2021 |
| TLC AS | Real estate | 2021 |
| TLK Holding AS | | 2024 |
| Toms & Tordis Ans | Wholesale & retail | 1990 |
| Tor Oskar Holding AS | Professional & scientific | 2024 |
| Tor's Hammer AS | Administrative & support | 2015 |
| Toråsveien Vann- Og Avløpsanlegg SA | Water & waste | 2014 |
| Træleborgveien 9 AS | Real estate | 1980 |
| Tur & Fritid AS | Wholesale & retail | 2019 |
| Turskr AS | | 2020 |
| Tveitens Invest AS | | 2025 |
| Tønsberg Torvgate AS | Real estate | 2023 |
| Uleholmen Invest AS | Manufacturing | 1990 |
| Undhjem Media AS | Professional & scientific | 2009 |
| Upfront QRM AS | Health & social care | 2014 |
| Vangen Investment AS | Real estate | 1979 |
| Vangen Utvikling AS | Real estate | 2014 |
| VDM International AS | Professional & scientific | 2012 |
| Vec Holding AS | Hospitality | 2020 |
| Veifellesskapet Rødnes, Langestrand Og Skautangen SA | Real estate | 2018 |
| Velvære Klinikken Tjøme AS | Other services | 1983 |
| Verdens Ende AS | Real estate | 1998 |
| Verdens Ende Camping AS | Hospitality | 2014 |
| Verdens Ende Eiendom AS | Real estate | 2024 |
| Verdens Ende Spiseriet AS | Wholesale & retail | 2001 |
| Vestfold Gassteknikk Og Rør AS | Construction | 2022 |
| Vestfold Konsernet AS | Construction | 2022 |
| Vestveien 303 AS | | 2011 |
| Veterinær Løvheim AS | Professional & scientific | 2025 |
| Villa Havna Tjøme AS | Hospitality | 2022 |
| Villa Søby AS | Real estate | 2006 |
| Villstrå Vinmakeri SA | Agriculture & fishing | 2022 |
| Voc Energy Trading AS | Wholesale & retail | 2021 |
| Vrengen Maritime AS | Manufacturing | 1997 |
| Vrengen Maritime Tjenester 1 AS | Professional & scientific | 2026 |
| Vrengen Maritime Tjenester 2 AS | Professional & scientific | 2026 |
| Vrengen Maritime Tjenester 3 AS | Professional & scientific | 2026 |
| Vrengen Maritime Tjenester 4 AS | Professional & scientific | 2026 |
| Vrengen Maritime Tjenester 5 AS | Professional & scientific | 2026 |
| Vulkaniseringen AS | Real estate | 1968 |
| Welike.No AS | Wholesale & retail | 2020 |
| Woodwork AS | Manufacturing | 2020 |
| Xle.No AS | Wholesale & retail | 2012 |
| Yoga Vital AS | Wholesale & retail | 2019 |
| Øde Invest AS | | 2018 |
| Ødekjære Vann Og Avløp AS | Water & waste | 2016 |
| Økonomiavdelingen Ans | Professional & scientific | 1996 |
| Ølda Holding AS | Construction | 2005 |
| Østbygda Fiberlag AS | Information & communication | 2017 |
| Østveien 529 AS | Real estate | 1987 |
| Østveien 532 AS | Other services | 2025 |
| Østveien 533 AS | Real estate | 2015 |
| Øyene Rørservice AS | Construction | 2026 |
| Øyene Rørservice Invest AS | Construction | 2020 |