| Orklahus AS | Construction | 2012 |
| Orkland Arkitektkontor AS | Professional & scientific | 2016 |
| Orkland Bowling AS | Arts & recreation | 2019 |
| Orkland Brikett AS | Water & waste | 2021 |
| Orkland Bygg & Eiendom AS | Real estate | 2019 |
| Orkland Eiendomsteknikk AS | Administrative & support | 2024 |
| Orkland Handelspark AS | Real estate | 2021 |
| Orkland Husservice AS | Administrative & support | 2021 |
| Orkland Industriservice AS | Manufacturing | 2020 |
| Orkland Næringspark AS | Real estate | 2008 |
| Orkland Oppussing AS | Construction | 2020 |
| Orkland Pizza & Grill House AS | Hospitality | 2025 |
| Orkland Taxi AS | Transport & logistics | 1980 |
| Orklapøbben AS | Hospitality | 2008 |
| Orklareiser AS | Administrative & support | 2005 |
| Osteopatiklinikken Midt-Norge AS | Health & social care | 2016 |
| Oti Storkjøkken ANS | | 1988 |
| PEARL2 AS | Real estate | 1983 |
| Pepperkakehuset AS | Real estate | 2019 |
| Polaris Trykk Orkanger AS | Manufacturing | 2007 |
| Postgården Orkanger AS | Real estate | 2007 |
| Prebo Bygg AS | Construction | 2024 |
| Prodtech AS | Wholesale & retail | 2021 |
| Pål Selvnes Holding AS | Real estate | 2022 |
| R-M Holding AS | Manufacturing | 2020 |
| R.Nygård Holding AS | | 2021 |
| Raido Campers AS | Wholesale & retail | 2022 |
| Raido Holding AS | | 2022 |
| Ramberghaug Holding AS | | 2025 |
| Ramp Dekor AS | Professional & scientific | 2024 |
| Reit AS | Information & communication | 2008 |
| Reitan Drift AS | Hospitality | 2017 |
| Reme-Gården AS | Real estate | 2014 |
| Remidt Næring AS | Water & waste | 2019 |
| Remidt Næringseiendom AS | Real estate | 2019 |
| Retura Midt AS | Water & waste | 2001 |
| Rockshirt Nuf | Wholesale & retail | 2017 |
| Roma Invest AS | Professional & scientific | 2019 |
| Romstad Drift AS | Manufacturing | 2020 |
| Roro Utvikling AS | Real estate | 2010 |
| Rosenvik AS | Health & social care | 1962 |
| Rosenvik Eiendom AS | Real estate | 2021 |
| Rosenvik Holding AS | Health & social care | 2018 |
| Rosenvik Kompetanse AS | Health & social care | 2018 |
| Rosenvikveien 17 AS | Real estate | 2022 |
| Rostad Møbler AS | Wholesale & retail | 1985 |
| Rømmetunet AS | Real estate | 2017 |
| Rømmetunet Næring AS | Real estate | 2018 |
| RØNNING3 Og Hus AS | Construction | 2015 |
| Røsand Eiendom Bruhagen AS | Real estate | 2007 |
| Røåsvegen AS | Real estate | 2023 |
| S&T Aktiv Fritid AS | Wholesale & retail | 2022 |
| S&T Utvikling AS | Real estate | 2018 |
| Sabrura Orkanger AS | Hospitality | 2020 |
| Sagberg Eiendom AS | Real estate | 2005 |
| Sakshaug Sport Orkanger AS | Wholesale & retail | 2015 |
| Salcom Eiendom AS | Professional & scientific | 2001 |
| Salvesen & Thams AS | Wholesale & retail | 2012 |
| Salvesen & Thams Eiendom AS | Real estate | 2014 |
| Salvesen & Thams Historiske Eiendommer AS | Real estate | 2025 |
| Salvesen & Thams Invest AS | Wholesale & retail | 2014 |
| Selvnes Bolig AS | Real estate | 2026 |
| Selvnes Bygg AS | Construction | 2014 |
| Selvnes Eiendom AS | Real estate | 2022 |
| Selvnes Holding AS | | 2022 |
| Selvnes Utvikling AS | Real estate | 2023 |
| Servion AS | Construction | 2026 |
| Shawcor Norway AS | Manufacturing | 1992 |
| Shawcor UK Limited Norway | Administrative & support | 2016 |
| Sithco Da | | 1992 |
| Sjøgata Holding AS | Construction | 2005 |
| Skadebesiktigelse AS | Professional & scientific | 1997 |
| Skarbo Holding AS | | 2025 |
| Skeidar Orkanger AS | Wholesale & retail | 2016 |
| Skjetne Design AS | Professional & scientific | 2014 |
| Skjølberg Eiendom AS | Real estate | 1990 |
| Skjølberg Holding AS | Real estate | 2017 |
| Skuls AS | | 2012 |
| SL Equities AS | Professional & scientific | 2023 |
| Slettås Vann- Og Avløpsteknikk AS | Water & waste | 2014 |
| Slush Norge AS | Administrative & support | 1998 |
| Snorre Nygård AS | Real estate | 2010 |
| Solem Eiendom AS | Construction | 2004 |
| Solfang AS | Real estate | 2019 |
| Solgt Holding AS | Wholesale & retail | 2020 |
| Solligård AS | Construction | 1991 |
| Speztools AS | Wholesale & retail | 2015 |
| Spider AS | Transport & logistics | 2023 |
| Spikern AS | Construction | 2022 |
| Ssu Eiendom AS | Real estate | 2020 |
| Staveli Fysioterapi AS | Health & social care | 2026 |
| Steinshaug AS | | 2025 |
| Stenseth Maskin AS | Construction | 2016 |
| Ster Frisør AS | Other services | 2022 |
| Stig Morten Holding AS | Real estate | 2016 |
| Storheil Invest AS | | 2025 |
| Stormyr Holding AS | Manufacturing | 2005 |
| Stratega AS | Real estate | 2002 |
| Studiesenteret Trøndelag Sørvest AS | Education | 2025 |
| Størseth Optikk AS | Wholesale & retail | 1990 |