| SF Awareness Da | Oslo | 2008 |
| Sfo-Idrettsakademi AS | Røyse | 2012 |
| SFR Barnehager AS | Haugesund | 1986 |
| SFR Holding AS | Haugesund | 2014 |
| SG Management Group AS | Oslo | 2017 |
| SG Trafikkskole AS | Jaren | 2025 |
| SGD Holding AS | Kråkerøy | 2015 |
| Shaiva Tantra AS | Moss | 2025 |
| Shanson - Art of Living AS | Moss | 2013 |
| Shanti Yoga Studio AS | Gressvik | 2026 |
| Shaper AS | Øvre Årdal | 2016 |
| Shapeshifters AS | Ulset | 2023 |
| SHB Trafikkopplæring AS | Ås | 2026 |
| She AS | Bergen | 2018 |
| She Community AS | Lysaker | 2015 |
| She Global Invest Nuf | Gjettum | 2004 |
| Shemjakin Art Academy AS | Fjellhamar | 2022 |
| Sherli AS | Salhus | 2014 |
| Shestainability AS | Hundvåg | 2020 |
| SHF AS | Ålgård | 2024 |
| Shift AS | Jar | 2019 |
| Shigan Holding AS | Oslo | 2024 |
| Shining Light AS | Nordre Frogn | 2024 |
| Short Travel Education AS | Skien | 2026 |
| Shotokan Karate AS | Sandnes | 2014 |
| Show Heart AS | Godvik | 2022 |
| Showakademiet AS | Hafrsfjord | 2021 |
| Showbie Nordics AS | Måløy | 2021 |
| Showskolen AS | Hønefoss | 2012 |
| Siddis Barnehage SA | Stavanger | 2005 |
| Siddis Hundeskole AS | Røyneberg | 2011 |
| Siddis Taxiskole Da | Stavanger | 2023 |
| Sideout AS | Bekkestua | 2022 |
| Sideprosjekt AS | Otta | 2009 |
| Siderdama AS | Nordfjordeid | 2014 |
| Sidesporet Elverhøy AS | Andebu | 2023 |
| Siemens Healthcare GB | Surrey, Gu15 3Yl England | 2025 |
| Siewind AB Nuf | Tromsø | 2024 |
| Signatur Psykologtjenester AS | Bergen | 2026 |
| Signo Grunn- Og Videregående Skole AS | Andebu | 2012 |
| Sigrids Figurforming AS | Oslo | 2007 |
| Sigurdsgate Familiebarnehage AS | Oslo | 2018 |
| Sikker Trafikkopplæring AS | Skjetten | 2012 |
| Sikker Trafikkopplæring Vesterålen AS | Sortland | 2007 |
| Sikker Transport AS | Sortland | 2012 |
| Sikkerhetsakademiet AS | Oslo | 2007 |
| Sikkerhetsopplæring AS | Larvik | 2023 |
| Sikkerhetsrådgiver Eriksen AS | Verdal | 2021 |
| Sikkerhetssenteret Rørvik AS | Rørvik | 2012 |
| Sila Invest AS | Olsvik | 2016 |
| Silje Thorstensen AS | Fornebu | 2016 |
| Siljes Trafikkskole AS | Bodø | 2020 |
| Silverwing Market AS | Ålesund | 2026 |
| Silå AS | Jar | 2010 |
| Simitu AS | Tønsberg | 2021 |
| Simonsen Elektro AS | Ågotnes | 2026 |
| Simple Coaching AS | Kristiansand S | 2025 |
| Simsa AS | Trondheim | 2015 |
| Simsea Real Operations AS | Haugesund | 2017 |
| Sinapse Play AS | Drammen | 2025 |
| Sindre Borgli AS | Grålum | 2020 |
| Sindre Tveråmo Trafikkskole AS | Krokelvdalen | 2018 |
| Sinius AS | Haslum | 1992 |
| Sinnatreneren AS | Rakkestad | 2022 |
| Sinsen Fus Barnehage AS | Oslo | 2010 |
| Sioc - Study in Another Country AS | Stord | 2008 |
| Siri Dalsmo Berge Holding AS | Froland | 2023 |
| Siri Jensen AS | Fjellhamar | 2025 |
| Siril Helljesen Dressage AS | Råde | 2013 |
| Sirious:Business Limited Nuf | Stavanger | 2006 |
| Sirius Act AS | Oslo | 2018 |
| Sirius Familiebarnehage AS | Porsgrunn | 2012 |
| Sirius Naturterapeutisk Skole AS | Haugesund | 2012 |
| Sirlihaugen Barnehage SA | Fosnavåg | 1991 |
| Sis Sportssenter AS | Stavanger | 2005 |
| Sissel Juliana AS | Brattholmen | 2023 |
| Sisu Coaching AS | Oslo | 2013 |
| Sit Dragvoll Studentbarnehage AS | Trondheim | 2022 |
| Sit Moholt Studentbarnehage AS | Trondheim | 2022 |
| Sit Soppen Studentbarnehage AS | Gjøvik | 2022 |
| Sits Holding AS | Stavanger | 2012 |
| Sivilingeniør Per Kristian Ubøe AS | Sarpsborg | 1987 |
| Sivuna AS | Sandefjord | 2009 |
| Sjakktrening AS | Oslo | 2020 |
| Sjussa AS | Bergen | 2022 |
| Sjåførskulen AS | Voss | 2025 |
| Sjøakademiet AS | Sandvika | 2019 |
| Sjøhagen Fus Barnehage AS | Moss | 2018 |
| Sjøholt Folkehøgskole AS | Ørskog | 2019 |
| Sjøkanten Barnehage AS | Leknes | 2011 |
| Sjøkompetanse AS | Stord | 2022 |
| Sjølappen AS | Oslo | 2026 |
| Sjøliv Fus Barnehage AS | Torangsvåg | 2018 |
| Sjølyst Fus Barnehage AS | Saksvik | 2018 |
| Sjømatambassadøren AS | Hauglandshella | 1985 |
| Sjøsikker AS | Namsos | 2024 |
| Sjøsikker E-Læring AS | Namsos | 2025 |
| Sjøskogbekken Fus Barnehage AS | Ranheim | 2018 |
| Sjøstjerna Familiebarnehage Ans | Kvaløya | 2004 |
| SK - Lifestyle Nuf | Godvik | 2009 |