| Sinec Systems AS | Information & communication | 2020 |
| Sintef Nordvest AS | Professional & scientific | 2017 |
| Siolta AS | Wholesale & retail | 1992 |
| Sipo Holding AS | Professional & scientific | 2021 |
| Sipo Service AS | Professional & scientific | 2021 |
| Siri Godø AS | | 2024 |
| Siri Stoknes Holding AS | Financial services | 2015 |
| Siriknit AS | Manufacturing | 2011 |
| Sirius AS | Real estate | 2000 |
| Sirius D&I Holding AS | Professional & scientific | 2021 |
| Sirius Design & Integration AS | Professional & scientific | 2021 |
| Sirius Services AS | Wholesale & retail | 2022 |
| Sirø Holding AS | | 2019 |
| Sistranda Eiendom AS | Real estate | 2021 |
| Sivilingeniør Sam Lorgen AS | Professional & scientific | 1975 |
| Siviløkonom Asgeir Rotevatn AS | Professional & scientific | 1996 |
| Sjenstadberget AS | Real estate | 2016 |
| Sjgd AS | Information & communication | 2025 |
| Sjåstad Holding AS | | 1997 |
| Sjøbris Sauna AS | Arts & recreation | 2023 |
| Sjøbua Brunholmgata 1A AS | Real estate | 2016 |
| Sjøbua Ålesund AS | Hospitality | 2025 |
| Sjøholt Holding AS | Financial services | 2017 |
| Sjømannsveien 7 AS | Real estate | 2002 |
| Sjømannsveien Invest AS | Real estate | 1996 |
| Sjøsida Eiendom AS | Real estate | 2023 |
| Sjøsiden AS | Real estate | 2017 |
| Sjøtind Aalesund AS | | 2025 |
| Sjøtind AS | Transport & logistics | 2020 |
| Sjøtind Rederi AS | Administrative & support | 2021 |
| Sjøtind Shuttle AS | Transport & logistics | 2020 |
| Sjøvegen 4 AS | Real estate | 2022 |
| SK Kapital AS | Construction | 2021 |
| Sk-Eiendom AS | Real estate | 2022 |
| Sk-Utvikling AS | Construction | 2022 |
| Skaar Tekstil AS | Wholesale & retail | 1981 |
| Skadedyrkontrollen Nordvest AS | | 1995 |
| Skala Consult AS | | 2025 |
| Skalnord Med AS | Health & social care | 2026 |
| Skalér AS | Professional & scientific | 2012 |
| Skamek AS | Manufacturing | 1987 |
| Skamek Eiendom AS | Real estate | 2015 |
| Skamek Power AS | Wholesale & retail | 2010 |
| Skan El AS | Professional & scientific | 1987 |
| Skandinavisk Hus Og Hjem AS | Construction | 2023 |
| Skanse AS | Professional & scientific | 1986 |
| Skansekaia Utvikling AS | Real estate | 2009 |
| Skarbøvik Eiendom AS | Real estate | 2023 |
| Skarbøvik Enterprises AS | Real estate | 1987 |
| Skarbøvik Holding AS | Real estate | 2018 |
| Skarbøvika Apotek AS | Wholesale & retail | 2026 |
| Skarbøvika Industripark AS | Real estate | 2016 |
| Skarbøvika Tankanlegg AS | Wholesale & retail | 1989 |
| Skarbøvikgata 41 AS | Real estate | 2021 |
| Skaregata 10 AS | Real estate | 2014 |
| Skaro Invest AS | | 2021 |
| Skarsbygg AS | Construction | 2015 |
| Skarsbygg Utvikling AS | Real estate | 2023 |
| Skarsvåg Handel AS | Wholesale & retail | 2023 |
| Skarven Holding AS | Real estate | 2022 |
| Skateflua AS | Hospitality | 1999 |
| Skattekorthjelpen AS | Professional & scientific | 2026 |
| Skeidar Ålesund AS | Wholesale & retail | 1978 |
| SKF Holding AS | Financial services | 2017 |
| Ski and Sail Norway AS | Arts & recreation | 2021 |
| Skills Hairstudio & Barbershop AS | Other services | 2017 |
| Skin Tonic Ålesund AS | Wholesale & retail | 2022 |
| Skinsmarket AS | Information & communication | 2025 |
| Skip Intro AS | Information & communication | 2021 |
| Skipsteknisk AS | Professional & scientific | 1993 |
| Skipsteknisk Invest AS | Agriculture & fishing | 2002 |
| Skiri Invest AS | | 2019 |
| Skjervika AS | Construction | 2005 |
| Skjong Eiendom AS | Real estate | 2015 |
| Skjong Mechanical Service and Support AS | Manufacturing | 2025 |
| Skjongholmen III AS | Real estate | 2022 |
| Skjongholmen Invest AS | Real estate | 2018 |
| Skodje International Dental Holding AS | | 2022 |
| Skodje Kjøpesenter AS | Real estate | 2008 |
| Skodje Lagerbygg AS | Real estate | 1992 |
| Skodje Næringspark AS | Real estate | 1991 |
| Skogstad Holding AS | | 2021 |
| Skoledrift AS | Real estate | 1998 |
| Skomakeren Ans | Other services | 1994 |
| Skorpen Og Myren Antirust Ans | Other services | 1985 |
| Skriveportalen AS | | 2026 |
| Skråvika Byggefelt SA | Real estate | 1975 |
| SKS Netthandel AS | Wholesale & retail | 2020 |
| Sku Holding AS | | 2022 |
| Skuggen Holding AS | | 2024 |
| Skullis AS | | 2022 |
| Skum-Tex AS | Wholesale & retail | 1963 |
| Sky Studio AS | Professional & scientific | 2025 |
| Skye AS | Health & social care | 2021 |
| Skårbrevik Aut Trafikkskole AS | Education | 1980 |
| Skåthaugen Barnehage SA | Education | 2000 |
| Slamsug AS | Water & waste | 2020 |
| Slamsug Holding AS | Water & waste | 2020 |
| Sleipner Holding AS | Financial services | 2015 |
| Slettebakk AS | Professional & scientific | 2013 |