| Trio Barnehager AS | Rørvik | 2023 |
| Trio Trafikk Holding AS | Kristiansand S | 2020 |
| Trio Trafikkskole Alta AS | Alta | 2013 |
| Trio Trafikkskole AS | Kristiansand S | 2020 |
| Trio Trafikkskole Roar Hætta AS | Alta | 2013 |
| Triplet Musikk AS | Hundvåg | 2024 |
| Tripp-Trapp-Tresko AS | Høvåg | 2012 |
| Trivsel Trim AS | Oslo | 2021 |
| Trivselsleder AS | Lillestrøm | 2010 |
| TRK Group AS | Oslo | 2006 |
| Troens Liv Barnehage AS | Skien | 2022 |
| Trojaco Kurs Og Konferanser Ans | Gjøvik | 2004 |
| Troll AS | Bryne | 2018 |
| Troll Consult Ans | Malvik | 2021 |
| Troll Lia Barnehage AS | Bølandet | 2023 |
| Troll Lia Eiendom AS | Bølandet | 2023 |
| Troll Lia Holding AS | Bølandet | 2023 |
| Troll-Myra Barnehage AS | Fosnavåg | 2005 |
| Troll-Myra Eiendom AS | Bølandet | 2023 |
| Trollhaugen Barnehage AS | Ålesund | 2007 |
| Trollhaugen Barnehage Holding AS | Ålesund | 2017 |
| Trollhaugen Barnehage Stranda SA | Stranda | 1992 |
| Trollhaugen Foreldrelagsbarnehage SA | Hommersåk | 2002 |
| Trollheimen Trafikkskole AS | Surnadal | 2024 |
| Trollhuset AS | Trollåsen | 2022 |
| Trolljeger AS | Sandnes | 2016 |
| Trollklubben Barnehage AS | Torp | 2004 |
| Trollklubben Torp AS | Torp | 2022 |
| Trollknausen Barnehage AS | Stamsund | 2008 |
| Trollmyra Barnehage AS | Bodø | 1998 |
| Trollskogen Barnehage Bjørndal SA | Oslo | 1992 |
| Trollskogen Barnehage Ikenberget SA | Alversund | 2000 |
| Trollskogen Barnehage SA | Måløy | 2000 |
| Trollskogen Barnehage SA | Raufoss | 2002 |
| Trollskogen Barnehage SA | Myre | 2003 |
| Trollskogen Barnehage Storsteinnes SA | Storsteinnes | 1994 |
| Trollskogen Naturbarnehage SA | Moss | 2002 |
| Trollsletta Barnehage Ans | Oslo | 1990 |
| Trollsteinen Barnehage SA | Larvik | 1989 |
| Trollstua Barnehage Boen AS | Tveit | 2012 |
| Trollstua Barnehage SA | Fiskum | 1989 |
| Trollstua, Frelsesarmeens Barnehage I Asker AS | Asker | 2022 |
| Trollstubben Barnehage AS | Staubø | 2006 |
| Trollstubben Barnehage Da | Staubø | 2002 |
| Trolltangen Naturbarnehage AS | Halden | 2022 |
| Trollungene Familiebarnehage AS | Oslo | 2016 |
| Trommekurs No AS | Oslo | 2022 |
| Trommer & Bass AS | Oslo | 2026 |
| Troms Kompetanse AS | Storslett | 2012 |
| Tromsø Trafikkompetanse AS | Skibotn | 2015 |
| Tromsø Trafikkopplæring AS | Tomasjord | 2012 |
| Tromsø Trafikkskolesenter AS | Tromsø | 1994 |
| Tromsø Tungbilopplæring AS | Tomasjord | 2015 |
| Trond Harald Håland AS | Stavanger | 2026 |
| Trond Haugsgjerd Invest AS | Stavanger | 2005 |
| Trond Haukedal AS | Bergen | 1994 |
| Trond Hegseth AS | Hønefoss | 2015 |
| Trond Rønbeck Consulting AS | Drøbak | 2014 |
| Trond Tveiten Trafikkskole AS | Arendal | 2022 |
| Trondalen Barnehage AS | Gressvik | 2022 |
| Trondheim Hestesenter AS | Heimdal | 2017 |
| Trondheim Idrettsungdomsskole AS | Trondheim | 2014 |
| Trondheim Livssynshumanistiske Ungdomsskole AS | Ålesund | 2025 |
| Trondheim Musikalske Institutt Da | Trondheim | 2006 |
| Trondheim Musikkpark Da | Trondheim | 2010 |
| Trondheim Private Musikkskole AS | Trondheim | 2011 |
| Trondheim Ridesenter AS | Trondheim | 2026 |
| Trondheim Taiji Senter - Relax and Retreat AS | Hommelvik | 2018 |
| Trondheim Trafikkskole AS | Trondheim | 2012 |
| Trondheim Videregående Steinerskole AS | Trondheim | 2024 |
| Trong Trafikkskole AS | Haugesund | 2018 |
| Tronvik Gårdsbarnehage AS | Moss | 2007 |
| TRT Safety AS | Sandnes | 2023 |
| Trtc AS | Bjørnevatn | 2023 |
| Truenorth Coaching AS | Oslo | 2025 |
| Trulserudenga Barnehage SA | Jaren | 2001 |
| Truppen Og Lillekor Da | Oslo | 2007 |
| Trustme - Ed A/S | Tranby | 2016 |
| Trygg I Matematikk AS | Oslo | 2026 |
| Trygg I Tjenesten Da | Bodø | 2025 |
| Trygg Kompetanse HMS AS | Oslo | 2017 |
| Trygg Sammen AS | Sæbøvik | 2026 |
| Trygg Sjø AS | Arendal | 2025 |
| Trygg Trafikkopplæring AS | Bergen | 2013 |
| Trygg Trafikkskole AS Avd Romerike | Lillestrøm | 2018 |
| Trygg Økonomi AS | Sandefjord | 1998 |
| Trygge Barn 2.0 AS | Bodø | 2019 |
| Tryggestad Trafikkskole AS | Ålesund | 2012 |
| Tryggheim Skular AS | Nærbø | 2005 |
| Tryggheim Strand AS | Tau | 2013 |
| Trygve Trafikkskole AS | Haugesund | 2007 |
| Tryllefløyten Musikkbarnehage AS | Rissa | 2012 |
| Tryllefløyten Steinerbarnehage SA | Paradis | 2004 |
| Trysil Montessoriskole SA | Plassen | 2010 |
| Trysil Race Academy AS | Trysil | 2019 |
| Trysil Race Elite AS | Trysil | 2020 |
| Tryvann Event AS | Oslo | 2008 |
| Trøngsla Eiendom AS | Flekkefjord | 2001 |
| Trøste Og Bære Barnehage Nuf | Oslo | 2006 |
| TSJ Trafikkskole AS | Harstad | 2021 |