| Termo Swim Da | Slependen | 2004 |
| Ternevig Barnehage AS | Kristiansand S | 1987 |
| Terningen Arena Barnehage AS | Hamar | 2009 |
| Teroldego Tasting AS | Oslo | 2023 |
| Teroldego Trading AS | Oslo | 2023 |
| Terra Life AS | Skarnes | 2023 |
| Terra Magica Wilse & Wilse Da | Oslo | 1997 |
| Terrassen Barnehage Ans | Oslo | 1990 |
| Tertitten Barnehage Ans | Drøbak | 1996 |
| Tertnesparken Barnehage AS | Tertnes | 2005 |
| Tette Løsninger Norge AS | Oslo | 2015 |
| TF Kompetanse AS | Trondheim | 1992 |
| TFR AS | Knarrevik | 2001 |
| TFR Kurs AS | Oslo | 2016 |
| TG Service AS | Hell | 2024 |
| TGS Investa AS | Harstad | 2012 |
| The Actors Hub Oslo AS | Oslo | 2023 |
| The Art Collective AS | Oslo | 2019 |
| The Barber Academy AS | Tofte | 2023 |
| The Box Personlig Trening AS | Oslo | 2020 |
| The Brass Source-Messingkilden-Vestnorsk Trompetforum AS | Stord | 2023 |
| The British School of Oslo AS | Lysaker | 2023 |
| The Classical Ballet School of Oslo AS | Oslo | 2025 |
| The Consistency Project AS | Hakadal | 2026 |
| The Core Studio AS | Sandnes | 2019 |
| The E AS | Oslo | 2021 |
| The Folk Music Academy AS | Røros | 2020 |
| The Grit AS | Nøtterøy | 2018 |
| The Integrated Human AS | Voss | 2019 |
| The Learning Group AS | Oslo | 2014 |
| The Maritime Training Company AS | Ålesund | 2024 |
| The New You AS | Vigrestad | 2022 |
| The North Drum AS | Skien | 2017 |
| The Norwegian Combat Academy AS | Trondheim | 2024 |
| The Norwegian National Barbecue Team AS | Stavanger | 2011 |
| The Pilates School of Oslo AS | Oslo | 2023 |
| The Practice Space AS | Oslo | 2023 |
| The Room Bergen AS | Skien | 2025 |
| The Room Bærum AS | Bekkestua | 2026 |
| The Room Haugesund AS | Haugesund | 2025 |
| The Room Oslo AS | Oslo | 2004 |
| The Room Ski AS | Ski | 2025 |
| The Room Skien AS | Skien | 2017 |
| The Shift Collective AS | Asker | 2025 |
| The Stag AS | Førresfjorden | 2024 |
| The Theatre of Corruption AS | Oslo | 2015 |
| The We Effect AS | Bergen | 2020 |
| The Zone Dance Studio AS | Oslo | 2021 |
| Theas Bærum AS | Østerås | 1998 |
| Theas Holding AS | Østerås | 2017 |
| Theedge Da | Voss | 2008 |
| Thefri AS | Tønsberg | 2013 |
| Thelen AS | Gressvik | 2005 |
| Themyscira AS | Oslo | 2026 |
| Thereses Trafikkskole AS | Tromsø | 2018 |
| Theta Space AS | Oslo | 2026 |
| Think Trafikk AS | Kolbotn | 2002 |
| Thinkahead AS | Slependen | 2013 |
| Thinking Edge AS | Oslo | 2020 |
| This Is Trine Hansen AS | Tønsberg | 2024 |
| Thkittilsen AS | Lunde | 2024 |
| Thomas Hay AS | Tromsdalen | 2018 |
| Thomas International Norway AS | Ski | 1990 |
| Thomas Trafikkskole AS | Røyse | 2022 |
| Thomassen Undervisning Og Utleie AS | Straumsgrend | 2024 |
| Thomm AS | Mosjøen | 2025 |
| Thompson Management Consulting AS | Oslo | 2014 |
| Thomte Holding AS | Gjøvik | 2005 |
| Thorart - Thorkildsen Kunsformidling AS | Nesbyen | 2022 |
| Thorbjørnsens Kjøreskole AS | Tvedestrand | 1998 |
| Thore's Trafikkskole AS | Brumunddal | 2011 |
| Thorir AS | Kleppe | 2026 |
| Thorstein Finnerud AS | Drammen | 2017 |
| Thorstensen Trafikk-Komptanse AS | Frei | 2021 |
| Thorthor AS | Røros | 2020 |
| Thoru Holding AS | Førde | 2012 |
| Thorvaldsen Ans | Son | 2008 |
| Thoskogen Naturbarnehage AS | Otta | 2009 |
| Thrana HR AS | Nittedal | 2013 |
| Thrive Online AS | Oslo | 2017 |
| Thune Karci Sykkel Og Styrke Nuf | Oslo | 2011 |
| Thunø Holding AS | Hommersåk | 2023 |
| Tidsfri AS | Oslo | 2024 |
| Tifra AS | Nesttun | 2021 |
| Tiger Og Drage Da | Fagerstrand | 2010 |
| Tigergutt Familiebarnehage AS | Oslo | 2025 |
| Tigergutt Familiebarnehage Nuf | Oslo | 2008 |
| Tigir AS | Voll | 2016 |
| Tiki-Taka Norway AS | Vadsø | 1998 |
| Tilkomst Pro AS | Oslo | 2024 |
| Tilpassetopplaering.No Da | Fredrikstad | 2006 |
| Tiltrekning Datter AS | Oslo | 2026 |
| Tindfoten Fus Barnehage AS | Tomasjord | 2015 |
| Tine Engan AS | Oslo | 2026 |
| Tinn Montessoriskole SA | Tinn Austbygd | 2010 |
| Tinn Vikar AS | Tinn Austbygd | 2018 |
| Tinn Vinje Trafikkopplæring AS | Gransherad | 2015 |
| Tiny Studios AS | Oslo | 2022 |
| Tippen Barnehage SA | Porsgrunn | 1988 |
| Tips Trafikkskole AS | Hamar | 2025 |