| Teho Holding AS | | 2019 |
| Tek Holding Mo AS | | 2024 |
| Teks AS | Real estate | 2009 |
| Telemix AS | Information & communication | 1987 |
| Temm Holding AS | Transport & logistics | 2021 |
| Temporary Space Mo I Rana AS | Real estate | 2021 |
| Terapibygg Mo AS | Real estate | 1999 |
| Tergo Eiendom AS | Real estate | 2011 |
| TGD Holding AS | | 2025 |
| TGJ Eiendom AS | Real estate | 2014 |
| TGJ Management AS | Manufacturing | 2009 |
| TH Blikk AS | Construction | 2013 |
| TH Blikk Eiendom AS | Construction | 2005 |
| TH Blikk Holding AS | Construction | 2013 |
| TH Eiendom Rana AS | Real estate | 2013 |
| Thamul AS | Professional & scientific | 2021 |
| The B Mo I Rana AS | Hospitality | 2022 |
| The Coring Company AS | Professional & scientific | 2019 |
| THN Holding AS | Professional & scientific | 2012 |
| Thomas Von Westensgate 10 AS | Real estate | 2018 |
| Thomas Von Westensgate 3 AS | Real estate | 2019 |
| Thora AS | Real estate | 2013 |
| Tiba AS | | 2021 |
| Tilkomstteknikk AS | Construction | 2015 |
| Timo AS | Professional & scientific | 1974 |
| Titus Eiendom AS | Real estate | 2012 |
| Tive Tag Norway AS | Professional & scientific | 2022 |
| Tjårnes Transport AS | Transport & logistics | 1995 |
| TK Maskinentreprenør AS | Construction | 2020 |
| TL Consulting AS | Financial services | 2016 |
| TLM Holding AS | Education | 2012 |
| Tmi AS | | 2005 |
| TMM Invest AS | | 2020 |
| TNB Mo AS | Wholesale & retail | 2016 |
| Tocara Liv & Røre Ans | Administrative & support | 1996 |
| Toel Holding AS | Professional & scientific | 2015 |
| Toft Arkitekter AS | Real estate | 1997 |
| Tom Sandberg AS | | 2014 |
| Tomi CJ Holding AS | Real estate | 2020 |
| Tool Holding AS | Information & communication | 2020 |
| Tooti Asia Butikk AS | Wholesale & retail | 2020 |
| Toppen Tannlegesenter AS | Health & social care | 2016 |
| Toppen Utleie AS | Real estate | 1999 |
| Toppen Utleie Holding AS | Real estate | 2025 |
| Topx AS | Professional & scientific | 2018 |
| Tora Klær AS | Wholesale & retail | 2005 |
| Tore Lundbakk Holding AS | Financial services | 2016 |
| Torgeir Nerdal Kiropraktikk AS | Health & social care | 2020 |
| Torget Eiendom AS | Real estate | 1946 |
| Torggata 7 AS | Real estate | 2023 |
| TORGGATA6 AS | Real estate | 2023 |
| Total Industriservice AS | Manufacturing | 2021 |
| Total Utleie AS | Administrative & support | 2015 |
| Totaltransport AS | Transport & logistics | 1993 |
| TP Transport AS | Transport & logistics | 2014 |
| Transfer Pricing Consult Norway AS | Professional & scientific | 2023 |
| Transportsentralen Rana SA | Transport & logistics | 1992 |
| Trb-Tronic Da | Wholesale & retail | 1997 |
| Tre Og Betong AS | Construction | 1984 |
| Treningsverksted Ba | Health & social care | 1989 |
| Trine Dahlmo AS | Health & social care | 2019 |
| Trine Dahlmo-Klinikken AS | Health & social care | 2023 |
| Troma Invest AS | | 2024 |
| Trond Johnsen Holding AS | Real estate | 2007 |
| Trym Paulsen AS | Health & social care | 2025 |
| Turisttomta AS | Real estate | 2013 |
| Tusenbein Barnehage SA | Education | 1989 |
| TV Klipp AS | Information & communication | 2015 |
| Tverråga Eiendom AS | Professional & scientific | 1991 |
| Tverrånes Eiendom AS | Wholesale & retail | 2010 |
| Tverråsveien 7 AS | Real estate | 2018 |
| Tøf Servering AS | Hospitality | 2015 |
| Tømrer Jan Inge Rødahl AS | Construction | 2014 |
| Tømrer Molvik AS | Construction | 2025 |
| Tømrer Ørjan Dilkestad AS | Construction | 2024 |
| Tømrermester Selsøyvoll AS | Construction | 1994 |
| Tønne Eiendom AS | Real estate | 1998 |
| Ugelstad Mekaniske AS | Other services | 2024 |
| Umbukta Fjellstue AS | Hospitality | 2000 |
| Umitech AS | Real estate | 2022 |
| Ums AS | Real estate | 2021 |
| Underlysten AS | | 2021 |
| Unik Frisør Mo AS | Other services | 2015 |
| Unikt Ad Da | Wholesale & retail | 2006 |
| Unimaskin AS | Construction | 1976 |
| Ut I Fjorden AS | Real estate | 2021 |
| Uteliv AS | Hospitality | 2011 |
| Utskarpen Bil Og Maskin AS | Transport & logistics | 2006 |
| V-Tech AS | Professional & scientific | 2022 |
| V.A Holding AS | Information & communication | 2022 |
| Vaajmoe AS | Professional & scientific | 2020 |
| Vacker Död Stad AS | Administrative & support | 2016 |
| Valle Eie AS | Professional & scientific | 2015 |
| Vard AS | Wholesale & retail | 1996 |
| VARDE24 AS | Information & communication | 2026 |
| Vatna Invest AS | Professional & scientific | 2015 |
| VBG AS | Real estate | 2022 |
| VBL AS | | 2026 |
| Vegard Nerdal AS | | 2021 |
| Vege Eiendom AS | Real estate | 1991 |