| Stårri AS | Professional & scientific | 2023 |
| Stø Technology AS | Professional & scientific | 2021 |
| Støle Investing AS | | 2023 |
| Stølen Development AS | Information & communication | 2026 |
| Subito AS | | 2018 |
| Subvin AS | Wholesale & retail | 2023 |
| Sula Entreprenør AS | Construction | 1996 |
| Sulebak-Haugen Holding AS | Real estate | 2015 |
| Sund Eiendomsselskap AS | Real estate | 2012 |
| Sund Entreprenør AS | Professional & scientific | 2026 |
| Sunde AS | Manufacturing | 1962 |
| Sunde Family Invest AS | | 2025 |
| Sunde Montering AS | Construction | 2015 |
| Sunde Property Trondheim AS | Real estate | 2005 |
| Sunde Trading AS | | 2026 |
| Sundegårdene AS | Real estate | 1969 |
| Sundolitt Hitra AS | Real estate | 2014 |
| Sundshine AS | Other services | 2024 |
| Sunncom AS | Wholesale & retail | 2016 |
| Sunniva B Eidset AS | Professional & scientific | 2026 |
| Sunnmøre Auto AS | Transport & logistics | 2019 |
| Sunnmøre Begravelsesbyrå AS | Other services | 1940 |
| Sunnmøre Dyreklinikk AS | Professional & scientific | 2012 |
| Sunnmøre Eiendomsmegling AS | Real estate | 2006 |
| Sunnmøre Engros AS | Wholesale & retail | 2003 |
| Sunnmøre Fiskeindustri AS | Manufacturing | 1991 |
| Sunnmøre Fiskeindustri Eiendom AS | Real estate | 2020 |
| Sunnmøre Fiskeindustri Holding AS | Manufacturing | 2018 |
| Sunnmøre Frossenfisk Da | Wholesale & retail | 1990 |
| Sunnmøre Gods Holding AS | Financial services | 1969 |
| Sunnmøre Kjøkken AS | Wholesale & retail | 1989 |
| Sunnmøre Live AS | Information & communication | 2013 |
| Sunnmøre Mat AS | Wholesale & retail | 2020 |
| Sunnmøre MR Klinikk AS | Health & social care | 1999 |
| Sunnmøre Næringsmegling AS | Real estate | 2016 |
| Sunnmøre Og Romsdal Fiskesalslag SA | Wholesale & retail | 1970 |
| Sunnmøre Padel AS | Arts & recreation | 2022 |
| Sunnmøre Parkering AS | Transport & logistics | 2006 |
| Sunnmøre Partners AS | Financial services | 2017 |
| Sunnmøre Romsdal Billag Anleggstransport AS | Transport & logistics | 2002 |
| Sunnmøre Sjåførutleie Og Invest AS | Transport & logistics | 2023 |
| Sunnmøre Transport AS | Water & waste | 1986 |
| Sunnmøre Visjonstøperi AS | Professional & scientific | 2017 |
| Sunnmørsalpar Eigedom AS | Real estate | 2016 |
| Sunnmørsmegleren AS | Real estate | 2019 |
| Sunnmørsmusea AS | Arts & recreation | 2026 |
| Sunnmørsposten AS | Information & communication | 1984 |
| Sunnmørstakst AS | Real estate | 2004 |
| Sunny Syd AS | | 2025 |
| Superkry AS | Information & communication | 2020 |
| Surnadal Industrivegen AS | Real estate | 2023 |
| Surveycon Ans | Professional & scientific | 1990 |
| Survitec Group Norway AS | Manufacturing | 2013 |
| Survitec Safety Solutions Norway AS | Manufacturing | 2015 |
| Suve Invest AS | Real estate | 2020 |
| SV Holding AS | Financial services | 2013 |
| Svabø Invest AS | Real estate | 2018 |
| Svadberg Holding AS | Construction | 2017 |
| Svai Sauna AS | Arts & recreation | 2020 |
| Svanshornet AS | | 2020 |
| Sveggis Holding AS | | 2025 |
| Sveggisx AS | Administrative & support | 2025 |
| Svein Arne Vatnehol AS | Wholesale & retail | 2011 |
| Svein Arne Vatnehol Holding AS | Wholesale & retail | 2011 |
| Sveiseverkstedet K. G. Karlsson AS | Manufacturing | 2015 |
| Sverre Eidsvik AS | Wholesale & retail | 1998 |
| Sverre Farstad & Co AS | Transport & logistics | 2019 |
| Sverrkau AS | | 2019 |
| Svidde AS | | 2020 |
| Svinø Drift AS | Real estate | 2025 |
| Svinø Eiendom 1 AS | Real estate | 2025 |
| Svinø Eiendom 2 AS | Real estate | 2025 |
| Svinø Eiendom AS | | 2025 |
| Svinø Entreprenør AS | Construction | 1989 |
| Svinø Vekst AS | Construction | 2005 |
| Svoren Lyd AS | Arts & recreation | 2026 |
| SVV Holding AS | Manufacturing | 2023 |
| Svømmehallen Fysioterapi AS | Health & social care | 2003 |
| Sydsether Eiendom AS | Real estate | 1992 |
| Sydsiden Bilutleie AS | Administrative & support | 1985 |
| Sydsæther Holding AS | Agriculture & fishing | 2013 |
| Sydsæther Regnskap AS | Professional & scientific | 2018 |
| Sydveggen AS | Financial services | 2005 |
| Sykkylven Eiendom AS | Real estate | 2010 |
| Sylfiden AS | | 2021 |
| Sylvkallen AS | Professional & scientific | 2005 |
| Symbio Consult AS | Professional & scientific | 2020 |
| Symbio Holding AS | Professional & scientific | 2020 |
| Symbiose Norge AS | Professional & scientific | 2006 |
| Symje AS | Professional & scientific | 2005 |
| Synnalandsneset AS | Real estate | 2014 |
| Synnatebøvel Holding AS | | 2026 |
| Synnes & Partners Venture Capital AS | Real estate | 2016 |
| Synnes Invest & Consulting AS | Professional & scientific | 2015 |
| Synnes Ventures AS | Real estate | 2007 |
| Syvdefjordvegen 518 AS | Real estate | 2021 |
| Stensønes Elektro AS | Professional & scientific | 1984 |
| Sæplast Norway AS | Wholesale & retail | 2004 |
| Sætremyr Eiendom AS | Real estate | 2003 |
| Sætres Consulting AS | Professional & scientific | 2016 |