| Sogn Grønt AS | Vangsnes | 2020 |
| Sogn Og Fjordane Avistrykk AS | Førde | 2005 |
| Sogn Trafikk AS | Vik I Sogn | 2025 |
| Sognasaumen Dame- Og Herrebunad AS | Hafslo | 2023 |
| Sognatre AS | Sogndal | 2008 |
| Sognefjord Kaffibrenneri AS | Sogndal | 2017 |
| Sognefjord Naturkjøkken Drift AS | Solvorn | 2021 |
| Soh Invest AS | Verdal | 2005 |
| Soknedal Bakeri Og Konditori AS | Soknedal | 2008 |
| Sol Blubio AS | Flekkefjord | 2017 |
| Sola Betong AS | Tananger | 1994 |
| Sola Trykkeri & Kopi AS | Tananger | 2006 |
| Solabakeren AS | Røyneberg | 1996 |
| Solar Semi Engineering Ltd | Cambridgeshire Cb3 9Nb | 2011 |
| Solaris Bus & Coach SP. Z.O.O. | 62-005 Owinska | 2016 |
| Solbakken Automasjon AS | Vågstranda | 2008 |
| Solberg & Hansen AS | Oslo | 1946 |
| Solberg Industri AS | Fredrikstad | 1966 |
| Solberg Industri Holding AS | Fredrikstad | 1979 |
| Solberg Industriservice AS | Meråker | 2008 |
| Solberg Landbruksservice AS | Heradsbygd | 2018 |
| Solberg Pettersen AS | Kvaløya | 1987 |
| Solberg Sagbruk Da | Lonevåg | 2004 |
| Solberg Stål Og Tre AS | Kragerø | 2025 |
| Solblomst Innovasjion AS | Stavanger | 2024 |
| Sole AS | Eggedal | 1971 |
| Solem Sag AS | Øvre Surnadal | 2007 |
| Solem Skoservice AS | Ingeberg | 2022 |
| Solems Rosetter AS | Klæbu | 2026 |
| Solenis Norway AS | Oslo | 2014 |
| Solens Forlag AS | Fredrikstad | 2012 |
| Solevia AS | Sandnes | 2025 |
| Solfjeld AS | Tvedestrand | 1998 |
| Solfjeld Eiendom AS | Tvedestrand | 2008 |
| Solheim Kjøtt AS | Bergen | 1971 |
| Solheim Service AS | Halden | 2019 |
| Solheim Trevare AS | Bagn | 2013 |
| Solheim Trevarer AS | Bagn | 2023 |
| Solheimslien 56 AS | Bergen | 2012 |
| Solhjell AS | Oslo | 1994 |
| Solhjell Service AS | Molde | 2015 |
| Solhåve Eiendom AS | Otta | 2003 |
| Solhøi Cider AS | Oslo | 2020 |
| Solhøi Mekaniske AS | Steinkjer | 1995 |
| Solid Betong AS | Mo I Rana | 2018 |
| Solid Innredning AS | Hommelvik | 1987 |
| Solid Sjøservice AS | Eidsnes | 1996 |
| Solidenergy AS | Ågotnes | 1989 |
| Solidtec AS | Kokstad | 2014 |
| Sollerud Båtbyggeri & Slipp AS | Oslo | 2011 |
| Solli Trappefabrikk AS | Silsand | 1993 |
| Sollia Allmennings Og Bygdesag SA | Atna | 1999 |
| Sollia Bygg Mesterbedrift AS | Atna | 2012 |
| Sollia Ysteri AS | Sollia | 2024 |
| Solliaysteriet SA | Sollia | 2015 |
| Sollid Maskinering AS | Skjåk | 2022 |
| Sollid Mek Verksted AS | Surnadal | 1982 |
| Sollie Development AS | Son | 2016 |
| Sollihøgda Portservice AS | Sollihøgda | 2021 |
| Sollihøgda Trevarefabrikk AS | Minnesund | 1984 |
| Solliwood AS | Bardu | 2022 |
| Solmo Holding AS | Aurskog | 2020 |
| Solpumpa AS | Tønsberg | 2017 |
| Solserv Solutions & Services Europe AB | Se-232 37 Arlöv | 2014 |
| Solsiden Holding AS | Oslo | 2005 |
| Solskifer AS | Jømna | 2021 |
| Solskinnen AS | Eidsvågneset | 2025 |
| Solskjermingsgruppen Ringfoss AS | Oslo | 1994 |
| Solsletta Holding AS | Lillesand | 2013 |
| Solsmie AS | Dovre | 2025 |
| Solstrand Verft AS | Tomrefjord | 2008 |
| Solum Produkter AS | Bjørkelangen | 1992 |
| Solund Båtbyggeri AS | Hardbakke | 2018 |
| Solund Verft AS | Hardbakke | 2003 |
| Solution Sign AS | Stokke | 2008 |
| Solvoll Invest AS | Ulsteinvik | 2005 |
| Solvtech AS | Skjeberg | 2006 |
| Solwr Robotics AS | Ålesund | 2016 |
| Solystic SAS | Fr-26300 Alixan | 2000 |
| Solås Auto AS | Åsvang | 2023 |
| Solør Bioenergi Varme AS | Brumunddal | 2000 |
| Solør Industriservice AS | Flisa | 1989 |
| Solør Mekaniske Verksted AS | Flisa | 2010 |
| Somamed AS | Nesoddtangen | 2002 |
| Somic Verpackungsmaschinen GmbH & Co. KG | De-83123 Amerang | 2022 |
| Sommarøy Fryseanlegg AS | Sommarøya | 2019 |
| Sommer Og Fritid Midt Norge Da | Meldal | 2003 |
| Sommerborg AS | Høvik | 2018 |
| Sommerfryd Eplesider AS | Oslo | 2026 |
| Son Apoteklab AS | Son | 2015 |
| Son Plast AS | Son | 2024 |
| Son Venin AS | Oslo | 2016 |
| Sondres Båt & Motorservice AS | Stavanger | 2023 |
| Songe Mekaniske Verksted AS | Arendal | 2009 |
| Songe Sag Ans | Froland | 1983 |
| Songe Træsliperi AS | Songe | 1981 |
| Sonofit AS | Trondheim | 2024 |
| Soon Snekkerverksted AS | Son | 1990 |
| Sophia Brand Jewellery AS | Sandvika | 2015 |
| Sophies Minde Ortopedi AS | Oslo | 2003 |