| Torunns Logopedtjeneste AS | Health & social care | 2023 |
| Torvet 10 AS | Real estate | 1996 |
| Torvet 2 AS | | 2024 |
| Torvet Holding 2 AS | | 2024 |
| Totonor Eiendom AS | Arts & recreation | 1997 |
| Trafikantproduksjon AS | Education | 2024 |
| Trafikk Eiendom AS | Real estate | 2007 |
| Trafikkskole Ans | Education | 2013 |
| Trafikkskolen Ans | Education | 2013 |
| Trafikkskolen Harstad AS | Education | 1995 |
| Trafikkskolen Moddy AS | Education | 2022 |
| Trafikkskolen.No Ans | Education | 2013 |
| Trafikkskolesenteret AS | Education | 1991 |
| Trainme AS | Education | 2024 |
| Trama Eiendom AS | Wholesale & retail | 1986 |
| Trama Harstad AS | Wholesale & retail | 2001 |
| Transportkjøl AS | Wholesale & retail | 2010 |
| Transportsentralen Harstad SA | Transport & logistics | 1978 |
| Trelto Holding AS | Real estate | 2023 |
| Trendy Bykuben AS | Professional & scientific | 2003 |
| Trio Rør AS | Construction | 2022 |
| Trivelig Hjem Bygg Og Eiendom AS | Real estate | 2025 |
| Trohagen Holding AS | Wholesale & retail | 2015 |
| Troms Kjøkken AS | Wholesale & retail | 2013 |
| Tromsbyggkontroll AS | Professional & scientific | 2025 |
| Tromsø Estate AS | Real estate | 2026 |
| Trond Nordmark AS | Construction | 1998 |
| Trondenes Maskin AS | Construction | 2020 |
| Trygg Varme AS | Administrative & support | 2024 |
| Trøkk 16 AS | Manufacturing | 2018 |
| Ts-Nn Holding AS | Real estate | 2022 |
| TSG8 AS | Real estate | 2025 |
| TSJ Trafikkskole AS | Education | 2021 |
| TT Eiendom AS | Wholesale & retail | 2017 |
| TT Leif-Magne Klæboe AS | | 2019 |
| Tummes Eiendom AS | Real estate | 2021 |
| Tunes Media AS | Information & communication | 2006 |
| Tunneset 8 AS | Real estate | 2004 |
| Tveter Holding AS | Wholesale & retail | 2019 |
| Tornerose AS | Wholesale & retail | 1987 |
| Tøco Holding AS | | 2026 |
| Tømrer Halvorsrud AS | Construction | 2018 |
| Tømrer Tore Erlandsen AS | Construction | 2021 |
| Umami Harstad AS | Hospitality | 2011 |
| Under Huden Medisinsk Hudklinikk AS | Health & social care | 2022 |
| Unibas AS | Manufacturing | 2022 |
| Urd Technologies AS | Information & communication | 2025 |
| Ut På Tur AS | Wholesale & retail | 2014 |
| Uttakleiv Holding AS | Hospitality | 2023 |
| V Kapital AS | | 2023 |
| V.A.S. Holding AS | Real estate | 2016 |
| Vait Holding AS | Manufacturing | 2019 |
| Vakre Vene AS | Wholesale & retail | 2024 |
| Valmed AS | Health & social care | 2018 |
| Vandema AS | | 2020 |
| Vangen Harstad AS | Construction | 2014 |
| Vangen Harstad Drift AS | Construction | 2021 |
| Vannvittig Nord Da | Wholesale & retail | 2025 |
| Vargmyra AS | Real estate | 2018 |
| Veb Harstad AS | Wholesale & retail | 2023 |
| Vebostad Holding AS | | 2026 |
| Vedant AS | Hospitality | 2023 |
| Vei Og Anleggsboring AS | Construction | 1992 |
| Verkstedveien 15 B AS | Real estate | 2016 |
| Verkstedveien Eiendom AS | Real estate | 1996 |
| Vesterålen AS | Real estate | 2006 |
| Vesterålen Invest & Drift AS | Real estate | 2020 |
| Vesterålsgata 134 AS | Real estate | 1994 |
| Vestre Grovfjord Grunneierlag SA | Agriculture & fishing | 1965 |
| Vet I Nord AS | Professional & scientific | 2023 |
| VETERINÆR1 AS | Professional & scientific | 2026 |
| Vidar Eilertsen AS | Construction | 2021 |
| Vidar Trane Trafikkskole AS | Education | 1990 |
| Vidkunsgt 3 a AS | Real estate | 1997 |
| Vikan Utleie AS | Administrative & support | 2019 |
| Vikhaug Kiropraktikk Og Helse AS | Health & social care | 2022 |
| Viking Easy Living AS | Hospitality | 2005 |
| Viking Golfsenter Da | Arts & recreation | 1997 |
| Viking Road Rentals AS | Administrative & support | 2025 |
| Viking Solutions AS | Hospitality | 2005 |
| Vil Mer AS | Real estate | 2008 |
| Vimat AS | Agriculture & fishing | 2024 |
| Vinda AS | Administrative & support | 2025 |
| Vinterbro Eiendom AS | Real estate | 2004 |
| Vip AS | Wholesale & retail | 2005 |
| Vip Eiendom AS | Wholesale & retail | 2008 |
| Vispiro AS | Health & social care | 2021 |
| Vitalisklinikken AS | Health & social care | 2010 |
| Vitalux Helse AS | Health & social care | 2014 |
| Vitkon AS | Information & communication | 1998 |
| VMR Holding AS | Real estate | 2023 |
| VMR Interiør AS | Professional & scientific | 2025 |
| Volt Bolig Harstad AS | Construction | 2020 |
| Volt Eiendom Harstad AS | Real estate | 1996 |
| Volt Eiendom Hålogaland AS | Real estate | 2025 |
| Volt Eiendom Narvik AS | Real estate | 2024 |
| Volt Elektro Harstad AS | Construction | 2004 |
| Volt Entreprenør AS | Construction | 2020 |
| Volt HKG Invest AS | Construction | 2010 |
| Volt Holding Drift AS | Construction | 1992 |