| Nærøysund Gartnerservice AS | Agriculture & fishing | 2014 |
| Nærøysund Kranservice AS | Construction | 2016 |
| Nærøysund Maskinsenter AS | Wholesale & retail | 2008 |
| Nærøysund Rorbuer AS | Real estate | 2018 |
| O M Nergård Holding AS | Real estate | 2017 |
| Odd Fellow Huset Ofstad SA | Real estate | 2018 |
| Ofstad Kystfiske AS | Agriculture & fishing | 2022 |
| Ofstad Maskin AS | Construction | 2016 |
| Okan Bygg AS | Construction | 2026 |
| Olav Myhre AS | Agriculture & fishing | 2021 |
| Oppdretternes Miljøservice AS | Agriculture & fishing | 2010 |
| Opplæringskontoret for Fiskerifag Nord I Trøndelag SA | Education | 1994 |
| Ottersøy Eiendom AS | Real estate | 2024 |
| Overfarten Café AS | Hospitality | 2021 |
| Ox Gym AS | Arts & recreation | 2023 |
| Parken AS | Real estate | 2024 |
| Paulsen & Williksen AS | Real estate | 2010 |
| Paulsen Maskin AS | Construction | 1983 |
| Per Gunnar Kongensøy AS | Construction | 2012 |
| Pharmaciagården AS | Real estate | 2023 |
| Pko Holding AS | Financial services | 2018 |
| Pkom AS | Information & communication | 1996 |
| PM a Holding AS | Real estate | 2011 |
| PM M Holding AS | Real estate | 2011 |
| Po-Multitjenester AS | Construction | 2020 |
| Prohav 1 AS | Administrative & support | 2026 |
| Prohav 2 AS | Administrative & support | 2026 |
| Prohav AS | Professional & scientific | 2024 |
| Prohav Management AS | | 2025 |
| Prohav Rederi AS | Transport & logistics | 2025 |
| Protek AS | Manufacturing | 2025 |
| Protek IP AS | | 2025 |
| PTG Rørvik Kulde AS | Construction | 2005 |
| PW Marina AS | Real estate | 2023 |
| Ramstadlandet Brygger AS | Real estate | 2017 |
| Rasken Holding AS | Agriculture & fishing | 2021 |
| RHS Maskin AS | Construction | 2024 |
| Ril Anlegg AS | Administrative & support | 2014 |
| Ril Barnehage AS | Education | 2024 |
| Rinvest AS | Financial services | 2022 |
| Roen AS | | 2021 |
| Roen Invest AS | | 2021 |
| Ruteq AS | Construction | 2014 |
| Ryem Eiendom AS | Real estate | 2020 |
| Røed Dagligvare AS | Wholesale & retail | 2026 |
| Røff CNC AS | Manufacturing | 2020 |
| Rørteq AS | Construction | 2022 |
| Rørvik Bil- & Havneservice AS | Wholesale & retail | 1988 |
| Rørvik Bok AS | Wholesale & retail | 2007 |
| Rørvik Eiendom AS | Real estate | 1997 |
| Rørvik Farge & Interiør AS | Wholesale & retail | 2018 |
| Rørvik Fisk AS | Manufacturing | 2001 |
| Rørvik Fisk Kystmiljø AS | Agriculture & fishing | 2018 |
| Rørvik Fiskemat AS | Manufacturing | 2001 |
| Rørvik Hangar AS | Transport & logistics | 2022 |
| Rørvik Kai AS | Real estate | 2023 |
| Rørvik Marina AS | Manufacturing | 1992 |
| Rørvik Olje AS | Transport & logistics | 2010 |
| Rørvik Rorbuer AS | Real estate | 2020 |
| Rørvik Samfunnshus SA | Real estate | 1962 |
| Rørvik Tak Og Blikk AS | Construction | 2020 |
| Rørvik Torg AS | Real estate | 2002 |
| Rørvikbutikk Al NSR AS | Wholesale & retail | 2024 |
| Rørvikfly AS | Administrative & support | 2016 |
| Saga Nor AS | Professional & scientific | 2022 |
| Salong Picasso AS | Other services | 2001 |
| Salten Holding AS | | 2021 |
| Sandnes Transport Og Terminal AS | Transport & logistics | 2005 |
| Sauøya Villsaulag SA | Agriculture & fishing | 2003 |
| Savoir AS | Education | 2025 |
| SB Rørvik AS | Construction | 2025 |
| Sealink AS | Transport & logistics | 2026 |
| Sentrumsgata 4 AS | Real estate | 2024 |
| Settnøy AS | Administrative & support | 2012 |
| Settnøy JR. AS | Agriculture & fishing | 2022 |
| Sevi AS | | 2022 |
| Sikkerhetssenteret Rørvik AS | Education | 2012 |
| Sincos Software AS | Information & communication | 2011 |
| Sink AS | | 2020 |
| Sinkaberg AS | Manufacturing | 2025 |
| Sinkaberg Drift AS | Agriculture & fishing | 1996 |
| Sinkaberg Emilsen Akvamiljø AS | Administrative & support | 2017 |
| Sinkaberg Havbruk AS | Agriculture & fishing | 2021 |
| Sinkaberg Invest AS | Manufacturing | 2021 |
| Sinkaberg Johnsen Invest AS | | 2020 |
| Sinkaberg NT145 AS | Manufacturing | 2023 |
| Sinkaduce Invest AS | | 2024 |
| Sir AS | Transport & logistics | 2018 |
| Sisire Retail AS | Wholesale & retail | 2013 |
| SJ Drift AS | Other services | 2013 |
| SJ Eiendom AS | Real estate | 2005 |
| SJ INVEST08 AS | | 2025 |
| SJ INVEST11 AS | | 2025 |
| Sjøsterk AS | Agriculture & fishing | 2017 |
| Skage Eiendom AS | Real estate | 2005 |
| Skage Invest AS | Wholesale & retail | 2005 |
| Skaugstad Holding AS | | 2020 |
| Skippergata 24 AS | Professional & scientific | 2014 |
| Smakformidling AS | Hospitality | 2026 |
| Soe Invest AS | | 2022 |