| Thor Bergseng & Co AS | Real estate | 1931 |
| Thorsrud Wood AS | Professional & scientific | 2020 |
| Thorstadgården AS | Real estate | 1989 |
| Thunder & Lightning Invest AS | Construction | 2019 |
| Thune Produkter Raufoss AS | Manufacturing | 2018 |
| THV Mjelde AS | Professional & scientific | 2018 |
| Thyli Holding AS | Arts & recreation | 2018 |
| Thyli Skiteam AS | Arts & recreation | 2020 |
| Tidevann Holding AS | | 2021 |
| Tiensuu AS | | 2024 |
| Tierra Sayo AS | Hospitality | 2020 |
| Tinde Økonomi Lillehammer AS | Professional & scientific | 2025 |
| Tiurtoppen Hytter AS | Real estate | 2008 |
| Tjennet AS | Real estate | 2006 |
| TK Eldrift AS | Construction | 2023 |
| TLL Invest AS | Real estate | 2010 |
| To M&M AS | Administrative & support | 2021 |
| Toas AS | Real estate | 2006 |
| Toge AS | Hospitality | 2005 |
| Toget Pub Ans | Hospitality | 1996 |
| Tokva Holding AS | | 2026 |
| Tokyopixel Artstudio Da | Professional & scientific | 2005 |
| Tom Malme Gundersen Invest AS | | 2023 |
| Tommeliten Barneklær AS | Wholesale & retail | 2023 |
| Tommytapet AS | Construction | 2008 |
| Toppen Legesenter AS | Health & social care | 1994 |
| Toppsletta Holding AS | | 2019 |
| Tor Kolden Holding AS | Financial services | 2005 |
| Tor Westerdahl AS | Health & social care | 2017 |
| Torbjørn Seielstad Holding AS | Wholesale & retail | 2005 |
| Tord Holberg AS | Wholesale & retail | 2017 |
| Tore Thorsplass Holding AS | | 2022 |
| Torgersens Tak & Blikkenslagerservice AS | Construction | 2018 |
| Total Production AS | Administrative & support | 2015 |
| Touch Frisører AS | Other services | 2007 |
| Toyota Sulland Lillehammer AS | Wholesale & retail | 1997 |
| TPG Holding AS | | 2012 |
| Tradewpower AS | Professional & scientific | 2017 |
| Trafikkskolen Dahlsveen & Olsen AS | Education | 2004 |
| Tran Holding AS | Financial services | 2005 |
| Transfe:R Forlag AS | Information & communication | 2018 |
| Transport- Og Logistikkrådgivning AS | Professional & scientific | 2026 |
| Transporthuset AS | Transport & logistics | 2012 |
| Tre Boligutleie AS | Real estate | 2021 |
| Trekon AS | Real estate | 1975 |
| Trend Z AS | Other services | 2001 |
| Trespor AS | Construction | 2025 |
| Tretanker AS | Real estate | 2023 |
| Trofé AS | Professional & scientific | 2020 |
| Trofé Holding AS | Wholesale & retail | 1980 |
| Trym Engø Holding AS | | 2026 |
| TSL Holding AS | | 2023 |
| TTH Bygg AS | Construction | 2020 |
| Tub Da | Health & social care | 2007 |
| Tuft Bygg AS | Construction | 2019 |
| Tungen Bil AS | Wholesale & retail | 1991 |
| Tungen Holding AS | Wholesale & retail | 2018 |
| Tur.Digital AS | Professional & scientific | 2021 |
| Turistforum a. Johannessen Eft. AS | Wholesale & retail | 2012 |
| Turthaugvegen SA | Real estate | 1962 |
| Tuva Holding AS | Transport & logistics | 2016 |
| Tyn AS | Financial services | 2017 |
| Tyrili Klatresystemer AS | Arts & recreation | 2001 |
| Tyrom AS | | 2022 |
| Tølløfsrud Holding AS | | 2020 |
| Tømmerberg Consulting AS | Professional & scientific | 2022 |
| Tømrer'N Lillehammer AS | Construction | 2020 |
| Uldvaren AS | Wholesale & retail | 1999 |
| Ulf's Holding AS | Construction | 2010 |
| Ullsokk Invest AS | | 2022 |
| Ulvenfilm AS | Information & communication | 2017 |
| Under Puta AS | Financial services | 2005 |
| Unparallel Nordic AS | Wholesale & retail | 2018 |
| Utleie AS | | 2006 |
| V-Holding AS | Real estate | 2007 |
| Vaktmestertjenesten Lillehammer AS | Administrative & support | 2012 |
| Valentor Revisjon AS | Professional & scientific | 2011 |
| Valtjammer AS | | 2023 |
| Vanaheim Security AS | Information & communication | 2026 |
| Vandreskoen AS | Wholesale & retail | 2014 |
| Vangsveien 001 AS | Real estate | 1993 |
| Vargstad Invest Ans | | 1999 |
| Vaskerikompetanse Magne Fjørtoft AS | Professional & scientific | 2020 |
| Veb AS | Professional & scientific | 2024 |
| Vebjørn Karlsen Holding AS | | 2023 |
| Veganske Greier AS | Wholesale & retail | 2023 |
| Vegselskapet Nordseter - Melsjøn Og Snultra SA | Real estate | 1974 |
| Vend AS | Real estate | 2014 |
| Veragu AS | | 2020 |
| Verbeek Foods AS | Professional & scientific | 2022 |
| Verdensmester AS | Hospitality | 2023 |
| Verksted Innlandet Ans | Arts & recreation | 2020 |
| Vestaker Invest AS | Administrative & support | 2014 |
| Vestringsvegen 1 AS | Real estate | 2011 |
| Vestringsvegen 12 AS | Real estate | 2022 |
| Vetcap AS | Professional & scientific | 2020 |
| Vi Tre AS | | 2020 |
| Vicsi AS | Professional & scientific | 2026 |
| Vidars Vaktmestertjenester AS | Administrative & support | 2024 |
| Vilde Ravnsborg Gurigard AS | Health & social care | 2020 |