| Såkornfrø AS | Financial services | 2016 |
| Sømsveien 5 AS | Real estate | 2017 |
| Sør Mur & Bygg AS | Construction | 2006 |
| T Marcussen Holding AS | Real estate | 2006 |
| T. Aalrud Holding AS | | 2020 |
| T. Risdal Consulting AS | Professional & scientific | 2018 |
| T. Risdal Holding AS | Professional & scientific | 2008 |
| T1 Eiendom AS | Real estate | 2018 |
| T18 Eiendom AS | Real estate | 2023 |
| T6 Eiendom AS | Real estate | 2025 |
| Ta Anlegg AS | Construction | 2022 |
| Tannlege Johnny Bjørnsen AS | Health & social care | 2003 |
| Taule Båtbyggeri AS | Real estate | 1981 |
| Tecenda AS | Professional & scientific | 2010 |
| Tegk Invest AS | Financial services | 2017 |
| Teknisk Hobby AS | Wholesale & retail | 1993 |
| Tell-It Solutions Da | Information & communication | 2003 |
| Temse Holding AS | Real estate | 2025 |
| Thomas Børud Music AS | Arts & recreation | 2006 |
| Thorvald Hansen AS | Construction | 2010 |
| Thorvald Hansen Eiendom AS | Real estate | 2019 |
| Tobias Invest AS | Real estate | 2011 |
| Tom Landås AS | Construction | 2026 |
| TOPP1 AS | Real estate | 2024 |
| Toppen Medical AS | Health & social care | 2022 |
| Tound Invest AS | Professional & scientific | 2014 |
| Traalum Invest AS | Financial services | 2005 |
| Treehugger AS | Wholesale & retail | 2025 |
| Tshk Accounting AS | Professional & scientific | 2023 |
| TW Consulting AS | Professional & scientific | 2016 |
| Tykkåsen Barnehage AS | Education | 2003 |
| Tøffel AS | | 2025 |
| Tønnesen Eiendom Ou AS | Real estate | 2014 |
| Uhd AS | Information & communication | 2021 |
| Umbrella AS | Real estate | 2011 |
| Utleiehus AS | Real estate | 1993 |
| Vaktmesterkompaniet Sør AS | Administrative & support | 2025 |
| Value Invest AS | Professional & scientific | 1997 |
| Valø Fisk AS | Agriculture & fishing | 2019 |
| Valø Holding AS | Agriculture & fishing | 2019 |
| Valøyene Holding AS | | 2025 |
| Varx AS | Other services | 2026 |
| Vecta AS | | 2025 |
| Vessøyneset Øst Vann Og Avløpslag SA | Water & waste | 2009 |
| Villa Trillo AS | Real estate | 2021 |
| Vindholmen Invest AS | | 2023 |
| Vinterly Holding AS | | 2025 |
| Wimme Holding AS | | 2021 |
| Yam Meditasjon AS | Education | 2025 |
| Yono AS | Real estate | 2022 |
| Ærlig-Talt AS | Professional & scientific | 2025 |
| Øksenberg Invest AS | Professional & scientific | 1997 |
| Østereng Invest AS | Real estate | 2004 |
| Øye-Holding AS | | 2015 |