| TRUCK1 Utleie AS | Tomasjord | 2024 |
| Trucktech Utleie AS | Gamle Fredrikstad | 2018 |
| True Invest AS | Sandnes | 2014 |
| True North - Arctic Guide Service Ekeblad AS | Longyearbyen | 2022 |
| True North Adventures AS | Skaland | 2021 |
| True Vertical Aviation Limited Nuf | Mt-1914 Floariana, Frn | 2025 |
| Truecare AS | Søreidgrend | 2018 |
| Trulavi Invest AS | Skedsmokorset | 2005 |
| Trumpet of Salvation to Israel | Dsfsdf | 2009 |
| Trust Cleaning AS | Bergen | 1997 |
| Trust Personal GmbH | At-4470 Enns | 2018 |
| Trust Security AS | Oslo | 2021 |
| Try Norway AS | Drammen | 1998 |
| Try Tromso AS | Tromsdalen | 2024 |
| Trye AS | Son | 2019 |
| Tryg Elektro AS | Trondheim | 2022 |
| Tryg Holding AS | Trondheim | 2024 |
| Trygg Bemanning AS | Hauglandshella | 2010 |
| Trygg Drift AS | Barkåker | 2023 |
| Trygg Eiendoms Forvaltning AS | Slependen | 2026 |
| Trygg Eiendomsdrift AS | Oslo | 2024 |
| Trygg Eiendomsservice AS | Geithus | 2025 |
| Trygg Holding AS | Oslo | 1982 |
| Trygg Maskinutleie AS | Løken | 2024 |
| Trygg Oslo AS | Oslo | 2018 |
| Trygg Personell Da | Ålesund | 2011 |
| Trygg Renhold AS | Jessheim | 2017 |
| Trygg Renhold AS Stor-Oslo | Oslo | 1978 |
| Trygg Sikkerhet AS | Oslo | 2022 |
| Trygg Utleie & Transport AS | Svelvik | 2015 |
| Trygg Varme AS | Harstad | 2024 |
| Trygghet I Fokus AS | Maura | 2012 |
| Tryggvask AS | Oslo | 2025 |
| Trygt Hjem AS | Oslo | 2015 |
| Trygve Løvås AS | Kongsberg | 2003 |
| Tryland Drift AS | Kristiansand S | 2022 |
| Trysil Bil & Motor Ans | Trysil | 2007 |
| Trysil Fjellbooking AS | Trysil | 2017 |
| Trysil Konsult AS | Hamar | 2016 |
| Trysil Liftutleie AS | Trysil | 2016 |
| Trysil Løpet AS | Trysil | 2024 |
| Trysil Renholds-Service AS | Trysil | 2021 |
| Trysil Restaurantgruppe SA | Trysil | 2011 |
| Trysil Skishop Eiendom AS | Trysil | 1999 |
| Trysil Ventilasjonsrengjøring AS | Trysil | 2025 |
| Trysil-Knuts Fjellverden, Eltdalen Nordre Ans | Jordet | 2005 |
| Tryvann-Oslo Studentfestival AS | Fredrikstad | 2025 |
| Træna Renhold AS | Træna | 2024 |
| Trænen AS | Haugesund | 2023 |
| Trøen Service AS | Bosberg | 2013 |
| Trøndelag Lyd Og Lys AS | Steinkjer | 2017 |
| Trøndelag Merservice AS | Meråker | 2020 |
| Trøndelag Outfitters AS | Mosvik | 2020 |
| Trøndelag Reiseliv AS | Trondheim | 1991 |
| Trøndelag Sjåførutleie AS | Fevåg | 2021 |
| Trøndelag Utleieservice AS | Steinkjer | 2020 |
| Trøndelag Vaktmesterservice AS | Trondheim | 2021 |
| Trønder Renhold AS | Melhus | 2017 |
| Trønder Økonomi AS | Jakobsli | 2000 |
| Trønderdrift AS | Kopperå | 2025 |
| Trønderfly AS | Frosta | 2021 |
| Trøndergrønt AS | Levanger | 2000 |
| Trøndermobil AS | Trondheim | 2024 |
| Trøndersk Landbruk AS | Stjørdal | 2001 |
| Trøndertekno AS | Trondheim | 2025 |
| Trøndervask AS | Heimdal | 2011 |
| Trøym Drift AS | Hemsedal | 2022 |
| TS Eiendomsservice AS | Stokkøy | 2013 |
| TS Finans AS | Skien | 2005 |
| TS Group AS | Porsgrunn | 2005 |
| TS Langeid AS | Bygland | 2023 |
| TS Rådgivning Og Rekruttering AS | Lillestrøm | 2017 |
| TS Servicetjenester AS | Sørskogbygda | 2020 |
| TS Utemiljø AS | Brandbu | 2018 |
| TSB AS | Skien | 2015 |
| Tschudi Marine Services AS | Skjervøy | 2006 |
| Tse Event AS | Tromsø | 2020 |
| TSG Marine | Hebburn Ne31 2Eq | 2019 |
| Tsgg Atlantic AS | Oslo | 2015 |
| Tsig Record 19 Ltd Nuf | N146Qh, London, Southgate | 2009 |
| TSK Maskin AS | Ingeberg | 2020 |
| TSM Offshore (Phils) Inc | 1235 Makati | 2019 |
| TSR Maskinutleie AS | Lora | 2026 |
| TSS Travel Service Scandinavia AS | Vøyenenga | 2012 |
| TT Byggdrift AS | Sandnes | 2020 |
| TT Dalen AS | Drammen | 2015 |
| TT Direkt AS | Lørenskog | 2022 |
| TT Eiendom Og Utleie Sortland AS | Risøyhamn | 2011 |
| TT Eiendomsdrift AS | Stavanger | 2022 |
| TT Kontorservice AS | Nøtterøy | 2017 |
| TT NDT Nuf | Wc2A 2Jr London | 2022 |
| TT Photography Tomas Tvrdy Nuf | Cz-739 34 Senov | 2026 |
| TT Renhold Og Bemanning AS | Båtsfjord | 2025 |
| Tt&S Limited | Pc 1095 Nicosia | 2011 |
| Tta Utleie AS | Sandefjord | 2026 |
| TTD Invest AS | Jøkelfjord | 2022 |
| TTF Brøyt Og Anlegg Da | Kristiansand S | 2011 |
| Ttmc AS | Orkanger | 2019 |
| TTR Invest AS | Tromsø | 2022 |
| TTS Norge AS | Trondheim | 2005 |