| Snø Invest AS | Tromsø | 2021 |
| Snøball AS | Oslo | 2024 |
| Snøball Design AS | Nesoddtangen | 2014 |
| Snøgg Økonomi AS | Ål | 2022 |
| Snøhetta AS | Oslo | 2012 |
| Snøhetta Design AS | Oslo | 2010 |
| Snøhetta Oslo AS | Oslo | 2010 |
| Snøhetta Overseas Architecture AS | Oslo | 2011 |
| Snøhetta Regnskap Alvdal Folldal AS | Alvdal | 2021 |
| Snøhetta Regnskap AS | Dovre | 2000 |
| Snøhetta Regnskap Fron AS | Vinstra | 2004 |
| Snøhetta Regnskap Molde AS | Molde | 2024 |
| Snøhetta Regnskap Oppdal AS | Oppdal | 2015 |
| Snøhetta Regnskap Otta Vågå AS | Vågå | 2015 |
| Snøhetta Regnskap Ringebu AS | Ringebu | 2014 |
| Snøhetta Regnskap Åndalsnes AS | Åndalsnes | 2022 |
| Snøhetta Regnskap Øyer AS | Øyer | 2013 |
| Snøkraft AS | Sandvika | 2026 |
| Snølys Design AS | Bergen | 2017 |
| Snøløs AS | Oslo | 2018 |
| Snøtind Invest AS | Bodø | 2019 |
| Snøugle AS | Gjøvik | 2022 |
| So Far So Good AS | Bergen | 2018 |
| So Gjersdal AS | Hellvik | 2015 |
| Soa AS | Oslo | 2022 |
| Soa Holding AS | Heggedal | 2014 |
| Soaa Holding AS | Asker | 2022 |
| Soad AS | Langhus | 2012 |
| Sobio Energi AS | Spongdal | 2020 |
| Sobona AS | Oslo | 1998 |
| Sobrax AS | Stavanger | 2016 |
| Socentral AS | Oslo | 2012 |
| Social Ads Management AS | Oslo | 2025 |
| Social Club AS | Oslo | 2023 |
| Social Impact Institute AS | Bergen | 2024 |
| Social Link AS | Sandefjord | 2026 |
| Socialyou AS | Vennesla | 2018 |
| Societe Cooperative Artisanale De Prestations De Services (Socaps) | Fr-76000 Rouen | 2023 |
| Societec AS | Voss | 2017 |
| Society of Petroleum Engineers Europe, Norwegian Branch Nuf | Sw1P 3Jt London | 2023 |
| Sociometri AS | Tananger | 2024 |
| Socius Direkte AS | Oslo | 2005 |
| Socius Invest AS | Kattem | 2019 |
| Sockpuppet Media Ltd | Somerset Ta6 3Nr | 2017 |
| Socomec U.K. Limited | Cirencester Gl7 5Xl | 2017 |
| Sodo AS | Oslo | 2016 |
| Soer Holding AS | Kristiansand S | 2006 |
| Sofica AS | Bergen | 2019 |
| Sofie Nilsen AS | Tomasjord | 2019 |
| Sofigate Norway AS | Lysaker | 2023 |
| Sofinvest AS | Lier | 2007 |
| Sofira Maritime Innovation AS | Haugesund | 2025 |
| Sofix AS | Aldra | 2016 |
| Sofratec | 72160 Thorigne Sur Due | 2012 |
| Soft and Complex Matter Lab International AS | Oslo | 2026 |
| Soft Design AS | Oslo | 2021 |
| Soft One AS | Oslo | 1999 |
| Soft Sertifisering AS | Bergen | 2010 |
| Softmoney AS | Stavanger | 2020 |
| Softox Defense Solutions AS | Lysaker | 2021 |
| Softox Solutions AS | Lysaker | 2012 |
| Softox Wound & Skin Care AS | Lysaker | 2018 |
| Software Engineering Gøteborg AB | Fredrikstad | 1995 |
| Sogaard.Net Invest AS | Oslo | 2015 |
| Sogara AS | Oslo | 2007 |
| Sogn Aqua Solutions AS | Haugesund | 2013 |
| Sogn Dyreklinikk AS | Lærdal | 2016 |
| Sogn Fjord Restaurering AS | Leikanger | 2026 |
| Sogn Industri AS | Førde | 2015 |
| Sogn Kompetanse AS | Øvre Årdal | 2021 |
| Sogn Naturforvalting AS | Fresvik | 2017 |
| Sogn Næring AS | Sogndal | 2007 |
| Sogn Oppmåling AS | Oslo | 2025 |
| Sogn Utvikling AS | Vik I Sogn | 2020 |
| Sogn Vegteneste Consult AS | Sogndal | 2018 |
| Sognefjord AS | Bjordal | 2018 |
| Sognefjord Net AS | Veitastrond | 1999 |
| Sognlab AS | Sogndal | 2003 |
| Sognli AS | Oksvoll | 2018 |
| Sogol AS | Oslo | 2017 |
| Sogs Design AS | Oslo | 2023 |
| Sogul Invest AS | Oslo | 2016 |
| Sohlberg & Toftenes AS | Lysaker | 1991 |
| Sohltoft Holding AS | Lysaker | 2023 |
| Sohn Group AS | Jessheim | 2024 |
| Soho Group AS | Oslo | 2020 |
| Sohu Consulting AS | Oslo | 2024 |
| Soil Steam International AS | Stokke | 2016 |
| Soilman AS | Heimdal | 2018 |
| Soilmate AS | Sande I Vestfold | 2019 |
| Soilvation AS | Skien | 2025 |
| Soilzero AS | Sandefjord | 2021 |
| Soin AS | Løken | 2003 |
| Soino AS | Vollen | 2026 |
| Soj Solutions Ltd | London Wc2H 9Jq England | 2021 |
| Soki Consulting AS | Kolbotn | 2023 |
| Sokkel Engineering AS | Blaker | 2013 |
| Sokker Og Tepper Manufaktur Da | Stabekk | 2000 |
| Sokrates AS | Oslo | 2000 |
| Sol & Maane Glow AS | Flekkerøy | 2024 |