| Slettedals Agentur AS | Wholesale & retail | 1983 |
| Slettvoll Ålesund AS | Wholesale & retail | 2008 |
| Slinning Gastro AS | Health & social care | 2020 |
| Slinningen Barnehage SA | Education | 2002 |
| Slinningen Eiendom AS | Real estate | 1995 |
| Slinningen Invest AS | Real estate | 2020 |
| Slogen AS | Real estate | 2005 |
| Slogen Eiendom AS | Real estate | 2013 |
| Slyngstad Aamlid Arkitekter AS | Professional & scientific | 1994 |
| SM Fysioterapi AS | Health & social care | 2019 |
| SM Rørservice AS | Construction | 2013 |
| Smak Holding AS | Financial services | 2011 |
| Smartstay AS | Real estate | 2023 |
| Smee AS | Real estate | 2014 |
| Smehl Boligutvikling AS | Real estate | 2020 |
| Smibakken 3 AS | Real estate | 2006 |
| Smibekk Eiendom AS | Real estate | 2007 |
| Smoe Holding AS | | 2026 |
| Smola Holding AS | | 2026 |
| Smutthullet Eiendom AS | Real estate | 2019 |
| Smutthullet Holding AS | Hospitality | 2019 |
| Smutthullet Pub AS | Hospitality | 1996 |
| Snadderbua Da | Hospitality | 2006 |
| Snah Invest AS | | 2019 |
| Snauskriu Invest AS | | 2003 |
| Snekkerservice Strømsheim AS | Construction | 2020 |
| Snikkerbo AS | Real estate | 2016 |
| Snos Moa AS | Wholesale & retail | 2013 |
| Softeria AS | Information & communication | 2023 |
| Soi One Ålesund AS | Hospitality | 2023 |
| Sok Invest AS | | 2019 |
| Sol Bac Export AS | Wholesale & retail | 1995 |
| Sol Trafikkskule AS | Education | 2009 |
| Solbac Import AS | Wholesale & retail | 2020 |
| Solbac Invest AS | Real estate | 2020 |
| Solbak Rønstad Matsenter AS | Wholesale & retail | 1978 |
| Solbraa Invest Pro AS | | 2024 |
| Solibakke Invest AS | | 2016 |
| Solid Parkett AS | Construction | 2021 |
| Solinn AS | Real estate | 2005 |
| Sollees AS | Wholesale & retail | 2025 |
| Solnør Eiendom AS | Real estate | 2016 |
| Solsiden Strandafjellet AS | Real estate | 2016 |
| Solskjær AS | Agriculture & fishing | 1985 |
| Solstrandvegen 40/42 AS | Real estate | 2022 |
| Solstrålen Familiebarnehage AS | Education | 2019 |
| Solsvingen AS | Hospitality | 2022 |
| Solvang Bygg AS | Construction | 2022 |
| Solveig Risbakk AS | Financial services | 2005 |
| Solwr Group AS | Administrative & support | 2022 |
| Solwr Robotics AS | Manufacturing | 2016 |
| Solwr Software AS | Information & communication | 1982 |
| Soma Studio AS | Arts & recreation | 2026 |
| Somaro AS | | 2017 |
| Somen AS | Information & communication | 2025 |
| Sonic Waste Da | Arts & recreation | 2023 |
| Soran Montering AS | Construction | 2025 |
| Sorentio AS | Professional & scientific | 2010 |
| Sorthe Holding AS | Wholesale & retail | 2022 |
| Sosi Holding AS | Professional & scientific | 2018 |
| Soundfence AS | Professional & scientific | 2025 |
| Soundtrip AS | Information & communication | 2022 |
| Sp-System Norge AS | Wholesale & retail | 2007 |
| Sparebank 1 Factoring AS | Financial services | 1988 |
| Sparebankeiendom AS | Real estate | 1982 |
| Sparebanken Møre | Financial services | 1985 |
| SPD Invest AS | | 2025 |
| Speiderhytta I Solnørdalen SA | Real estate | 2018 |
| Speidernes Hus Ålesund SA | | 1955 |
| Sperre Executive Search AS | Professional & scientific | 2023 |
| Sperre Invest AS | Financial services | 2018 |
| Spesialistbedriften AS | Information & communication | 2014 |
| Spiaggia Invest AS | | 2022 |
| Spiker AS | Wholesale & retail | 2017 |
| Spikra AS | Construction | 2023 |
| Spilcom AS | Manufacturing | 2022 |
| Spilka AS | Real estate | 2005 |
| Spilka Building Solutions AS | Wholesale & retail | 2020 |
| Spilka Eiendom AS | Real estate | 2006 |
| Spilka Inpuls AS | Real estate | 2006 |
| Spinbean AS | Professional & scientific | 2020 |
| Spir AS | Professional & scientific | 2023 |
| Spirea Holding AS | | 2020 |
| Spitzmeer AS | | 2025 |
| Spjelkavik Boutvikling AS | Real estate | 1997 |
| Spjelkavik Hotelldrift AS | Hospitality | 1998 |
| Spjelkavik Mat AS | Wholesale & retail | 2010 |
| Spjelkavik Panorama AS | Administrative & support | 2017 |
| Spjelkavik Tannlegesenter AS | Health & social care | 2020 |
| Spjelkavikruten Eiendom AS | Real estate | 1982 |
| Splitt Frisør AS | Other services | 2007 |
| Spocon AS | Real estate | 2007 |
| Sponland Foto AS | Wholesale & retail | 2004 |
| Sportsparken Vegsund AS | Arts & recreation | 2016 |
| Språkservice AS | Professional & scientific | 2004 |
| SPS Eiendom AS | Real estate | 2020 |
| SRD Holding AS | Financial services | 2005 |
| Stabjo AS | Real estate | 2005 |
| Stack Consulting AS | Information & communication | 2019 |
| Stad Holding AS | Financial services | 2018 |