| Teder Oü | 67002 Kuri, Sangaste Vald | 2009 |
| Tednor | Ee-68221 Valga Maakond | 2018 |
| Teem Combustions Group Asb Nuf | 523 38 Ulricehamn | 2013 |
| Teep AS | Nervei | 2016 |
| Tefelen Preissinger GmbH | De-94 149 Breitebgul Bach | 2016 |
| Tefire Group Oü | Ee-71503 Viljandi Maakond | 2023 |
| Teft Ballstad AS | Leknes | 2005 |
| Teft Entreprenør AS | Leknes | 2002 |
| Teft Gruppen AS | Leknes | 1989 |
| Teft Industrigulv AS | Porsgrunn | 2014 |
| Teg AS | Opphaug | 2024 |
| Tegan Entreprenør AS | Oslo | 2024 |
| Tegan Membran Og Taksikring AS | Oslo | 2025 |
| Tegl & Betong AS | Kristiansand S | 1996 |
| Tegl & Murerfirma Strømberg AS | Sæbøvågen | 2022 |
| Tegometall International Sales GmbH | Ch-8574 Lengwill | 2012 |
| Tehnoair AS | Langhus | 2022 |
| Teie Elektro AS | Nøtterøy | 2016 |
| Teien Rørservice AS | Asker | 2005 |
| Teige Nes Bygg AS | Tysse | 2019 |
| Teigen & Buen Entreprenør AS | Flesberg | 2024 |
| Teigland Vedlikehold AS | Erdal | 2022 |
| Teio AS | Brennåsen | 2009 |
| Teira Norway AS | Oslo | 2025 |
| Tejn Smedeforretning | 37700 Allinge | 2011 |
| Tek Miljø AS | Rasta | 2023 |
| Tek Multitjenester AS | Bjerkvik | 2011 |
| Tek Tomtegraving AS | Gjerdrum | 2017 |
| Teka Bygg AS | Blomsterdalen | 1995 |
| Teka Holding AS | Rådal | 2005 |
| Tekam AS | Trondheim | 2013 |
| Tekam Invest AS | Ranheim | 2017 |
| Tekam Telecom Og Elektro AS | Trondheim | 2015 |
| Tekdrift AS | Oslo | 2023 |
| Tekforvalt AS | Tana | 2012 |
| Tekk AS | Porsgrunn | 2001 |
| Tekkern AS | Sykkylven | 2022 |
| Tekn. Byggingeniør AS | Hagan | 2023 |
| Teknel AS | Tromsø | 2017 |
| Tekni AS | Stavanger | 2011 |
| Teknika AS | Molde | 2011 |
| Teknikk Bygg Og Tømrerfirma AS | Bærums Verk | 2014 |
| Teknikk Partner AS | Frogner | 2019 |
| Teknikkproff. AS | Frogner | 2022 |
| Teknikksupport AS | Egersund | 2006 |
| Teknikon AS | Nesttun | 2026 |
| Tekninor AS | Drammen | 2021 |
| Teknisk AS | Sola | 2013 |
| Teknisk Drift Og Eiendom AS | Fjellhamar | 2020 |
| Teknisk Gulv AS | Slemmestad | 2020 |
| Teknisk Hylle AS | Arendal | 2020 |
| Teknisk Installasjon AS | Vettre | 2024 |
| Teknisk Installasjon Holding AS | Vettre | 2024 |
| Teknisk Invest AS | Hafrsfjord | 2005 |
| Teknisk Isolasjon AS | Drammen | 2014 |
| Teknisk Isolatør AS | Gan | 2018 |
| Teknisk Netthandel AS | Brennåsen | 2005 |
| Teknisk Rørkontroll AS | Fetsund | 2022 |
| Teknisk Rørservice AS | Oslo | 2018 |
| Teknisk Service & Assistanse AS | Jevnaker | 2024 |
| Teknisk Servicepartner AS | Fjerdingby | 2024 |
| Teknisk Sprinkler AS | Notodden | 2021 |
| Teknisk Ventilasjon AS | Heimdal | 1998 |
| Teknisk Ventilasjon AS | Hafrsfjord | 1999 |
| Teknisk VVS AS | Kvernaland | 2018 |
| Teknisk VVS Entreprise AS | Oslo | 2025 |
| Tekniskbureau AS | Stavanger | 2022 |
| Teknoform Ans | Straumgjerde | 1990 |
| Teknor System AS | Steinkjer | 1990 |
| Tekoda Elektro AS | Kløfta | 2012 |
| Tekoda Norway AS | Auli | 2011 |
| Tekplan Rør AS | Gran | 2017 |
| Tekrom AS | Kolsås | 2021 |
| Teksle & Tveito Elektro AS | Lampeland | 2024 |
| Tekton AS | Stavanger | 2025 |
| Tekton Entreprenør AS | Kvål | 2025 |
| Tele Blikk AS | Notodden | 2020 |
| Tele Og Datainstallasjon A/S | Oslo | 1988 |
| Tele- Og Dataservice AS | Dilling | 2015 |
| Tele-Land Service AS | Trondheim | 2014 |
| TELE2TAL AS | Hylkje | 2023 |
| Telebygg Bratsberg AS | Hjartdal | 2013 |
| Telecompaniet AS | Oslo | 2014 |
| Telefonmannen AS | Oslo | 2009 |
| Teleklima AS | Porsgrunn | 2006 |
| Telekom Ekspert AS | Porsgrunn | 2024 |
| TELELARS1 AS | Larvik | 2022 |
| Telemark Avløpsrensing AS | Skien | 2013 |
| Telemark Betongpuss Og Forskaling AS | Bø I Telemark | 1999 |
| Telemark Blåseisolering AS | Gvarv | 2022 |
| Telemark Bygg Nuf | Skien | 2005 |
| Telemark Byggdrift AS | Porsgrunn | 2022 |
| Telemark Byggentreprenør AS | Gvarv | 2016 |
| Telemark Byggentreprenør Holding AS | Gvarv | 2019 |
| Telemark Byggteam AS | Porsgrunn | 2013 |
| Telemark Eiendomsservice AS | Langesund | 2017 |
| Telemark Elektro Og Montasje AS | Åmdals Verk | 2021 |
| Telemark Elektrotekniske Tjenester AS | Porsgrunn | 2022 |
| Telemark Energispar AS | Skien | 2002 |
| Telemark Entreprenør Holding AS | Porsgrunn | 2022 |