| Tommy Pængvik Holding AS | | 2022 |
| Tomorrownext AS | Information & communication | 2019 |
| Tompet Games AS | Professional & scientific | 2018 |
| Tomset Utbygging AS | Real estate | 2006 |
| Tomteutvikling Holding AS | Real estate | 2019 |
| Ton 618 AS | Professional & scientific | 2023 |
| Tone Bathen Holding AS | | 2022 |
| Tone Lindgren AS | Health & social care | 2016 |
| Tone Reinertsen Holding AS | Real estate | 2019 |
| Tonen AS | | 2026 |
| Tones Holding AS | Professional & scientific | 2019 |
| Tonning VVS AS | Construction | 2024 |
| Tool Box AS | Professional & scientific | 1998 |
| Toolbox Systems AS | Information & communication | 2007 |
| Tooth Fairy Holding AS | Health & social care | 2026 |
| Topi AS | Professional & scientific | 2020 |
| Topp Kvalitet Renhold AS | Administrative & support | 2013 |
| Topp Lyd & Lys AS | Administrative & support | 2025 |
| Toppbygg AS | Real estate | 2023 |
| Toppen Catering AS | Hospitality | 2011 |
| Toppen Terrasse AS | Real estate | 2021 |
| Toppen Øst AS | Real estate | 2023 |
| Tor 020 Holding AS | | 2023 |
| Tor Arne Vinje AS | Health & social care | 1995 |
| Tor Båtservice AS | Manufacturing | 2014 |
| Tor Ivar Hals Holding AS | Education | 2019 |
| Tor Kvam AS | Education | 2015 |
| Tor Martin Hassel AS | Real estate | 2005 |
| Tor Steinar Schei AS | Financial services | 2005 |
| Tor-Erik Johnsen Invest AS | Real estate | 2013 |
| Torbjørn Bratts Veg Eiendom AS | Real estate | 2023 |
| Torbjørn Bratts Vei 11 AS | Real estate | 2017 |
| Torbjørn Bratts Vei 11 Eiendom AS | Real estate | 2018 |
| Torbjørn Grøntvedt AS | Real estate | 2007 |
| Torch Da | Professional & scientific | 2006 |
| Tordenskiold Helsetjenester AS | Health & social care | 2012 |
| Tordenskioldsgate 1 AS | Real estate | 2016 |
| Tore Granbo AS | Financial services | 2005 |
| Tore Lund Invest AS | | 2025 |
| Tore Strømøy AS | Professional & scientific | 1994 |
| Tore Tann AS | Health & social care | 2025 |
| Tore Wiger Sivilarkitekt AS | Professional & scientific | 2017 |
| Tore Øverås AS | Health & social care | 1998 |
| Torebb & Co AS | Professional & scientific | 2011 |
| Tores AS | Financial services | 2018 |
| Tores Eftf AS | Wholesale & retail | 2000 |
| Toresoft AS | Information & communication | 2026 |
| Torgardstrøa 5-7 AS | Real estate | 2008 |
| Torgardsvegen 12 AS | Real estate | 2008 |
| Torgardsvegen 7-9 AS | Real estate | 2007 |
| Torgeir Magnussen Holding AS | Wholesale & retail | 2018 |
| Torgersen Kapital AS | | 2026 |
| Torgersen Thieme AS | Information & communication | 2022 |
| Torget Ans | Real estate | 1993 |
| Torggata 22 AS | Real estate | 2023 |
| Torghandel Trøndelag AS | Wholesale & retail | 2023 |
| Torghatten AS | Transport & logistics | 1921 |
| Torghatten Midt AS | Transport & logistics | 2008 |
| Torgård Invest AS | Real estate | 2016 |
| Torgård Næringseiendom AS | Real estate | 2017 |
| Torgård Sør AS | Real estate | 2026 |
| Torgård Tomt 1 AS | | 2017 |
| Torgård Tomt 2 AS | Real estate | 2017 |
| Torgård Utvikling AS | | 2026 |
| Toril Agnes Design Limited Nuf | Professional & scientific | 2025 |
| Toringo Holding AS | | 2024 |
| Torjussen & Partnere AS | Financial services | 2017 |
| Torkel Schive AS | Wholesale & retail | 2005 |
| Tormd Holding AS | | 2021 |
| Tormods Drift AS | Financial services | 2014 |
| Tormods Eiendom AS | | 2020 |
| Tormods Gate 3 AS | Real estate | 2013 |
| Toro Invest AS | Real estate | 2014 |
| Torshaug Aktiv AS | Health & social care | 2025 |
| Torstein Krogstad AS | Real estate | 2008 |
| Torstykket Molde AS | Real estate | 2012 |
| Toru Holding AS | Hospitality | 2021 |
| Torunn Frigård Holding AS | | 2025 |
| Torvhågen Invest AS | | 2007 |
| Torvikdesign AS | Arts & recreation | 2025 |
| Torvsletten Eiendom AS | Real estate | 2018 |
| Tosa Eiendom AS | Information & communication | 2019 |
| Total Consult Holding AS | Professional & scientific | 2007 |
| Total Teknisk AS | Construction | 2012 |
| Totalctrl AS | Information & communication | 2017 |
| Totalitet AS | Professional & scientific | 2003 |
| Totalkart Ans | Professional & scientific | 1989 |
| Totalpro AS | Real estate | 2014 |
| Totalsikring Da | Wholesale & retail | 2001 |
| Totech Design AS | Professional & scientific | 2005 |
| Touch by Bes AS | Financial services | 2017 |
| Touchdown Music AS | Information & communication | 1996 |
| Touchdown Travel Solutions AS | Information & communication | 2023 |
| Touchnetix AS | Professional & scientific | 2016 |
| Tourrenc Holding AS | Financial services | 2017 |
| Tov AS | | 2026 |
| Tove Rem Fossum Holding AS | Real estate | 2015 |
| Tove's Holding AS | Real estate | 2013 |
| Tovo AS | | 2024 |
| Tovås Holding AS | | 2021 |