| Tromsøya Legesenter AS | Tromsø | 2024 |
| Trond B. Kristoffersen AS | Tromsø | 2016 |
| Trond Sigurdsen AS | Oslo | 2016 |
| Trondheim Flylegesenter AS | Trondheim | 2023 |
| Trondheim Fotklinikk AS | Trondheim | 2023 |
| Trondheim Fysikalske Institutt AS | Trondheim | 2014 |
| Trondheim Helse - Og Utviklingssenter Da | Trondheim | 2010 |
| Trondheim Hjertesenter AS | Trondheim | 1996 |
| Trondheim Hudlegesenter AS | Trondheim | 2000 |
| Trondheim Hørsel Klinikk AS | Trondheim | 2018 |
| Trondheim Idrettsklinikk AS | Trondheim | 2013 |
| Trondheim Lungelegesenter AS | Trondheim | 2008 |
| Trondheim Mage- Og Tarmsenter AS | Trondheim | 2021 |
| Trondheim Manuell Terapi AS | Trondheim | 2005 |
| Trondheim Naprapati AS | Heimdal | 2019 |
| Trondheim Performance AS | Filtvet | 2018 |
| Trondheim Private Legekontor AS | Trondheim | 2014 |
| Trondheim Private Omsorgstjeneste AS | Trondheim | 2007 |
| Trondheim Psykologsenter AS | Trondheim | 2021 |
| Trondheim Tannlegesenter AS | Charlottenlund | 2015 |
| Trondheim Tannlegesenter AS | Charlottenlund | 2016 |
| Trondheim Tannregulering AS | Trondheim | 2013 |
| Trondheim Vaksinasjons Og Reisemedisinske Klinikk AS | Tiller | 2000 |
| Trondheim Øre-Nese-Hals AS | Jakobsli | 2019 |
| Trondheim Øyelegesenter AS | Trondheim | 1990 |
| Trondheimsgynekologene AS | Trondheim | 2023 |
| Trondheimstannlegene AS | Trondheim | 2019 |
| Trondhjems Fotterapi AS | Trondheim | 2020 |
| Trones Fysioterapi AS | Bodø | 2021 |
| Trop Øyehelse AS | Østerås | 2022 |
| Trovåg AS | Bergen | 2006 |
| TRP AS | Bergen | 2015 |
| Trude Staalesen AS | Vollen | 2021 |
| Truemark AS | Søreidgrend | 2018 |
| Trumstedt Care AS | Oppdal | 2025 |
| Trygg 24 AS | Årdalstangen | 2015 |
| Trygg Barndom AS | Eidsvoll | 2024 |
| Trygg Base AS | Stavanger | 2012 |
| Trygg Bo Og Behandlingssenter AS | Oslo | 2020 |
| Trygg Grunn AS | Oslo | 2012 |
| Trygg Helse Legesenter AS | Oslo | 2013 |
| Trygg Helse Legesenter Da | Oslo | 2015 |
| Trygg Helseklinikk AS | Sandefjord | 2026 |
| Trygg Hverdag Tjenester AS | Hønefoss | 2026 |
| Trygg Oppfølging AS | Lørenskog | 2026 |
| Trygg Start AS | Oslo | 2010 |
| Trygg Start Helse Og Omsorg AS | Oslo | 2017 |
| Trygg Utvikling Norge AS | Morvik | 2018 |
| Trygg-Grunn AS | Bergen | 2017 |
| Tryggbo AS | Trondheim | 2000 |
| Trygge AS | Oslo | 2021 |
| Trygge Sammen AS | Oslo | 2024 |
| Tryggere Hjem AS | Hamar | 2007 |
| Tryggmed Psykiatri AS | Lillestrøm | 2026 |
| Tryggmestring AS | Skreia | 2026 |
| Trygt AS | Stathelle | 2022 |
| Trygve Mjelde Fysioterapi AS | Rådal | 2022 |
| Trygvekontoret AS | Saksvik | 2023 |
| Trym Paulsen AS | Mo I Rana | 2025 |
| Trysil Fysioterapi AS | Trysil | 2006 |
| Trysil Private Omsorgstjeneste AS | Trysil | 2009 |
| Trysil Vask Og Rens AS | Trysil | 1986 |
| Trysiltannlegene AS | Trysil | 2020 |
| Trøgstad Tannlegesenter AS | Trøgstad | 2022 |
| Trøndelag Omsorgssenter AS | Steinkjer | 2015 |
| Trøndelag Ortopediske Verksted AS | Trondheim | 2004 |
| Trøndersk Kompetanse AS | Lensvik | 2013 |
| Trønnes Medical AS | Notodden | 2020 |
| TS Helse AS | Lillestrøm | 2026 |
| Tsaa AS | Sandnes | 2024 |
| Tsar AS | Trondheim | 2021 |
| TSC Holding AS | Oslo | 2023 |
| TSC Medical AS | Oslo | 2023 |
| Tse A/S | Askim | 1988 |
| TSL Estetisk AS | Hamresanden | 2021 |
| Tså Holding AS | Sarpsborg | 2023 |
| TT Fysio AS | Sandnes | 2024 |
| TT Legetjenester AS | Grimstad | 2024 |
| TT Oculus Medicus AS | Moss | 2020 |
| TTR AS | Sandnes | 2017 |
| Ttødegaard AS | Oslo | 2020 |
| Tub Da | Lillehammer | 2007 |
| Tuengen Allè 1 B AS | Oslo | 2011 |
| Tumen AS | Brønnøysund | 2005 |
| Tune Fysioterapi Da | Grålum | 2011 |
| Tune Gård AS | Ål | 2023 |
| Tune Legesenter AS | Grålum | 2013 |
| Tunestveit AS | Ål | 2005 |
| Tunet Arbeid & Karriere AS | Elverum | 2017 |
| Tuneto AS | Halden | 2023 |
| Tunge Holding AS | Stavanger | 2011 |
| Tunge Tannregulering AS | Stavanger | 2017 |
| Turid Hulbaklien AS | Oslo | 2015 |
| Turretur AS | Vettre | 2026 |
| Turretur Asker AS | Vettre | 2023 |
| Tusenhjemmet Bodø AS | Bodø | 2012 |
| Tuseth Kardio AS | Bergen | 2018 |
| Tutela AS | Heggedal | 2018 |
| Tutti Frutti Ventures AS | Oslo | 1997 |
| Tuven Tannklinikk AS | Horten | 2021 |