| Ohr Eiendom AS | Real estate | 2021 |
| Ohr Invest AS | Real estate | 2017 |
| Oj Gruppen AS | Wholesale & retail | 2026 |
| Olav Fossen AS | Construction | 2005 |
| Oll Invest AS | Financial services | 2005 |
| Onwater AS | Wholesale & retail | 2018 |
| Oppturen AS | | 2025 |
| Os-Service AS | Construction | 2017 |
| Partybeat AS | Administrative & support | 2013 |
| Pascal Transport AS | Transport & logistics | 2025 |
| Peismontøren AS | Construction | 2017 |
| Petors AS | Administrative & support | 2005 |
| Petors Estate AS | Real estate | 2021 |
| Pih Eiendom AS | Real estate | 2008 |
| Playing With Wires AS | Manufacturing | 2026 |
| Presso AS | | 2018 |
| Profauto Detailing AS | Other services | 2025 |
| Progotix AS | Information & communication | 2013 |
| Promur AS | Construction | 2025 |
| Puffin Hub AS | Information & communication | 2026 |
| R.C. Marthinsen AS | Real estate | 2021 |
| R.C. Marthinsen Bolig AS | Real estate | 2022 |
| Raketta Holding AS | Education | 2014 |
| Raudåsflata 7 AS | Real estate | 2022 |
| Ravi Investering AS | Real estate | 2005 |
| Red Carpet International Film Festival SA | Information & communication | 2011 |
| Renanger Eiendom AS | | 2007 |
| Robon AS | | 2024 |
| Rstokk Holding AS | Other services | 2025 |
| Rusten Invest AS | | 2025 |
| Råvill Næring AS | Professional & scientific | 2026 |
| RØREKSPERT-1 AS | Construction | 2024 |
| Sandø Consulting AS | Information & communication | 2015 |
| Sensogate AS | Construction | 2019 |
| SHN Tomt 1 AS | Real estate | 2018 |
| SHN Tomt 11 AS | Real estate | 2018 |
| SHN Tomt 12 AS | Real estate | 2018 |
| SHN Tomt 13-3 AS | Real estate | 2019 |
| SHN Tomt 16 AS | Real estate | 2019 |
| SHN Tomt 17-5 AS | Real estate | 2020 |
| SHN Tomt 5 AS | Real estate | 2018 |
| SHN Tomt 6 AS | Real estate | 2018 |
| Sjand AS | Professional & scientific | 2025 |
| Skain Hansen AS | Other services | 2026 |
| Skrubbhaugen Veiforetak SA | Transport & logistics | 2017 |
| SM Bjerkli AS | Construction | 2022 |
| Smis Holding AS | | 2025 |
| Sofa Invest AS | | 2020 |
| Sofa Invest II AS | | 2022 |
| Sol Invest AS | Construction | 2020 |
| Solid Innredning AS | Manufacturing | 1987 |
| Spabutikken Polarbad AS | Wholesale & retail | 2012 |
| Spor HR AS | Health & social care | 2009 |
| Spotlight AS | Wholesale & retail | 2017 |
| Stav Handel Og Næringspark AS | Real estate | 2017 |
| Stav Holding AS | | 2019 |
| Stav Næringspark AS | Real estate | 2015 |
| Stavs Eiendom AS | Real estate | 2015 |
| Stavsjø Invest AS | Manufacturing | 1988 |
| Stavsjøveien 4 AS | Real estate | 2014 |
| Stavsjøveien 6 AS | Real estate | 2014 |
| Steinar Leirvik AS | Wholesale & retail | 2005 |
| Stellander AS | Wholesale & retail | 2026 |
| Strømheim AS | Real estate | 2008 |
| Sturen AS | | 2021 |
| Sunset Invest AS | Wholesale & retail | 2021 |
| Supermokkis Invest AS | Professional & scientific | 2021 |
| Sutra Dybvad AS | Transport & logistics | 2005 |
| Sutra Sandvik AS | Transport & logistics | 1993 |
| Svane Holding AS | | 2015 |
| Sveberg AS | | 2021 |
| Sveberg Barnehage SA | Education | 2001 |
| Sveberg Dyrehospital AS | Professional & scientific | 2017 |
| Sveberg Gård AS | Real estate | 2018 |
| Sveberg Næringstomt 6 AS | Real estate | 2022 |
| Sveberg Storbilvask AS | Other services | 2020 |
| Svebergtunet 20 AS | Real estate | 2023 |
| Svebergtunet 8-10 AS | Real estate | 2013 |
| Svebergtunet Tomter AS | Real estate | 2023 |
| T-Olsen Holding AS | Financial services | 2016 |
| Talklet AS | Information & communication | 2025 |
| Tap Holding AS | | 2021 |
| Terax Transportservice AS | Transport & logistics | 2014 |
| Tesmon AS | Transport & logistics | 2020 |
| Tij Invest AS | Real estate | 2015 |
| Til Fjells AS | Professional & scientific | 2019 |
| Tirik Invest AS | | 2024 |
| Tono Asset Management AS | | 2023 |
| Tor Arne Lia AS | | 2018 |
| Torion Labs AS | | 2026 |
| Torvik Maskin AS | Construction | 2019 |
| Total Bolig Service AS | Construction | 2025 |
| Towertech AS | Construction | 2014 |
| TR. Rishaug Invest AS | Real estate | 2017 |
| TRD Rørservice AS | Construction | 2023 |
| Trio Eiendom AS | Real estate | 1981 |
| Trondheim Taiji Senter - Relax and Retreat AS | Education | 2018 |
| Tryg Bolig AS | Real estate | 2017 |
| Trøndelag Bildeler AS | Wholesale & retail | 2019 |
| TT Mat AS | Hospitality | 2009 |