| Svein Hågensen Holding AS | | 2023 |
| Svein Roar Wistven AS | Construction | 2001 |
| Svein Thomassen AS | Construction | 2018 |
| Svejo Holding AS | Financial services | 2012 |
| Swisma AS | Professional & scientific | 2023 |
| Swisma Eiendom AS | Real estate | 2024 |
| Swo Multiservice AS | Construction | 2023 |
| Sylskarp AS | Other services | 2022 |
| Sysalta AS | Information & communication | 2019 |
| Sámi Stories AS | Professional & scientific | 2017 |
| Sángon AS | Health & social care | 2011 |
| Søderholm Invest AS | | 2025 |
| Sønvisen Helse AS | Health & social care | 2016 |
| Sønvisuals AS | Administrative & support | 2024 |
| Sør-Varanger Utbygging AS | Real estate | 2020 |
| T Johansen Drift AS | Real estate | 2005 |
| T L Regnskap AS | Professional & scientific | 1990 |
| T M Nilsen Invest AS | Real estate | 2016 |
| T-J Bygg AS | Agriculture & fishing | 2021 |
| T-N Eiendom AS | Real estate | 2024 |
| T-N Holding AS | Real estate | 2024 |
| T. Gustavsen Holding AS | | 2017 |
| T. Moe Drift AS | Transport & logistics | 2026 |
| T. Ramberg Holding AS | | 2020 |
| T.A.Kristensen Holding AS | | 2021 |
| T.A.T. Bygg AS | Construction | 2021 |
| T.E Eiendom AS | Administrative & support | 2025 |
| T.E Holding AS | Real estate | 2016 |
| T.Mannsverk Holding AS | | 2021 |
| T.Rasmussen Holding AS | | 2024 |
| Takeflight AS | Information & communication | 2023 |
| Takmontering AS | Construction | 2024 |
| Takst Og Tilstand AS | Real estate | 2020 |
| Tannlege Bjarne Thomassen AS | Health & social care | 2000 |
| Tannlege Ivar Nielsen AS | Health & social care | 2000 |
| Tannlege Stig Antonsen AS | Health & social care | 2017 |
| Tannpleier Laila Kolpus AS | Health & social care | 2012 |
| Tarø Holding AS | | 2017 |
| TB Nord Eiendom AS | Real estate | 2011 |
| TBK Holding AS | Arts & recreation | 2021 |
| TBP Invest AS | | 2019 |
| Tde Eiendom AS | Real estate | 2006 |
| Te Opgård Holding AS | Administrative & support | 2025 |
| Tecto AS | Real estate | 2010 |
| Tecto Utbygging AS | Real estate | 2012 |
| Teh Holdning AS | | 2025 |
| Tekzine Røsberg AS | Wholesale & retail | 2025 |
| Ten Utvikling AS | | 2005 |
| Teo Holding AS | | 2010 |
| Tep AS | Real estate | 2022 |
| Terma FMB AS | Hospitality | 2022 |
| Tfj-Holding AS | | 2021 |
| TFT Eiendom Alta AS | Real estate | 2023 |
| TFT Holding AS | Transport & logistics | 2023 |
| TGR Eiendom AS | Real estate | 2011 |
| TH Byggfirma AS | Construction | 2007 |
| TH Fisk AS | Agriculture & fishing | 2023 |
| TH Solheim AS | Real estate | 2022 |
| The Norwegian Creedence Da | Arts & recreation | 2016 |
| The Shock Factor AS | Wholesale & retail | 2021 |
| Thelma Holding AS | Construction | 2021 |
| Thermoglass AS | Construction | 2021 |
| Thomas F. Thomassen AS | Transport & logistics | 2016 |
| Thomas F. Thomassen Eiendom AS | Real estate | 2021 |
| Thomasbakkveien 9 AS | Real estate | 2022 |
| Thomashøyden 16 AS | Real estate | 2023 |
| Thomashøyden 16 Holding AS | Real estate | 2024 |
| Thomassen & Berg Music Da | Arts & recreation | 2018 |
| Thomassen Anlegg AS | Construction | 2017 |
| Thomassen Bygg & Maskin AS | Construction | 2017 |
| Thomassen Eiendom AS | Real estate | 2017 |
| Thomassen Eiendomsselskap AS | Real estate | 2018 |
| Thomassen Holding AS | Real estate | 2017 |
| Thomassen Kystfiske AS | Agriculture & fishing | 2025 |
| Thomassen Maskin AS | Construction | 2007 |
| Thomassen Transport AS | Transport & logistics | 1989 |
| Thomassen's Elektriske AS | Construction | 2023 |
| Thunder Holding AS | Real estate | 2005 |
| Tid Estetiq AS | Other services | 2025 |
| Tiku AS | Health & social care | 2005 |
| Tima Press Snowmobile | Information & communication | 1995 |
| Tind Elektro AS | Professional & scientific | 2023 |
| Tirpitz Museum AS | Arts & recreation | 2017 |
| Tiurberget AS | | 2019 |
| TJ Eiendom Og Invest AS | Professional & scientific | 2019 |
| TJ Holding Og Invest AS | Real estate | 2013 |
| Tmo Eiendom AS | Real estate | 2020 |
| TMT Holding AS | | 2021 |
| TN Holding Alta AS | | 2018 |
| TNB Alta AS | Wholesale & retail | 2003 |
| To Halve-En Hel AS | Manufacturing | 2024 |
| Tokri Eiendom AS | Real estate | 2026 |
| Tokri Eiendom AS | Real estate | 2007 |
| Tokri Holding AS | | 2025 |
| Tokri Maskinutleie AS | Administrative & support | 2025 |
| Tollevikbergan Utbygging AS | Real estate | 2026 |
| Tom Agnalt Dagligvare AS | Wholesale & retail | 2016 |
| Tom Erik Nilsen Invest AS | | 2023 |
| Tom H. Thomassen Holding AS | Financial services | 2011 |
| Tomorrowtoo AS | Information & communication | 2019 |