| Ruglandsveien Barnehage SA | Education | 1995 |
| Russeartister AS | Information & communication | 2024 |
| Ruud Eiendom AS | Real estate | 1996 |
| Rønneberg Consulting AS | Information & communication | 2023 |
| Rønneberg Holding AS | | 2011 |
| Rørspesialisten AS | Construction | 2007 |
| Rørvik Eiendomsutvikling AS | Real estate | 2015 |
| Sae Invest AS | | 2020 |
| Saga Jost AS | | 2023 |
| Sagbraaten Holding AS | | 2021 |
| SALO1 Invest AS | Financial services | 2021 |
| Salpesto Invest AS | Financial services | 2017 |
| Sandwood Holding AS | | 2024 |
| Santa Invest AS | Real estate | 2014 |
| SAS Holding AS | Financial services | 2005 |
| Scandinavian Mountain Guides AS | Administrative & support | 2020 |
| Schiørn Invest AS | | 2026 |
| Schwantaks Ans | Construction | 1989 |
| Schäffergaarden AS | | 2021 |
| SE Folk AS | Education | 2022 |
| Seeland Invest AS | Financial services | 2014 |
| Sekkesaeter Shipping Ltd Nuf | | 2026 |
| Seliam Holding AS | | 2020 |
| Senegar AS | | 2024 |
| Seniorsupport Coco AS | Professional & scientific | 2022 |
| Sense of Direction AS | Other services | 2013 |
| Sepekto Eiendom AS | Real estate | 2009 |
| Sephi Invest AS | | 2025 |
| Seteviken AS | | 2024 |
| Seteviken Invest AS | Real estate | 2005 |
| Sez AS | Real estate | 2016 |
| Shecreate AS | | 2017 |
| Shed AS | Information & communication | 2019 |
| Shift AS | Education | 2019 |
| Shipvest AS | Transport & logistics | 2011 |
| Sho Invest AS | Financial services | 2005 |
| Signaturg AS | Information & communication | 2004 |
| Sigurd Beidel Invest AS | Financial services | 2017 |
| Sikaar Invest AS | Real estate | 2008 |
| Silje Ree Invest AS | Financial services | 2016 |
| Silva Gameiro AS | Financial services | 2018 |
| Silå AS | Education | 2010 |
| Singapore Invest AS | Financial services | 2012 |
| Sipcom Ltd Nuf | Information & communication | 2009 |
| Siriussenteret AS | Professional & scientific | 2016 |
| Sirkull AS | Manufacturing | 2024 |
| Siv Ing JP Dybdahl AS | Professional & scientific | 1993 |
| Siwra AS | Information & communication | 2016 |
| Sjø Og Li Holding AS | Professional & scientific | 2023 |
| Sjø Og Li Prosjektpartner AS | Professional & scientific | 2023 |
| Skagan Invest AS | Professional & scientific | 2020 |
| Skala Stillas AS | Administrative & support | 1995 |
| Skaldos AS | Information & communication | 2026 |
| Skansen Partners AS | Financial services | 2021 |
| Skarhus AS | Real estate | 2013 |
| Skattebo Holding AS | Financial services | 2015 |
| Skatteboeinvest AS | | 2022 |
| Skilvirk AS | Professional & scientific | 2013 |
| Skippergaten 8 Ans | Real estate | 1988 |
| Skipstadsand Brygge AS | Real estate | 2025 |
| Skjell Invest AS | Financial services | 2007 |
| Skogfaret AS | Real estate | 1997 |
| Skyline Consult AS | Information & communication | 2024 |
| Skytterdalen 5 AS | Real estate | 2013 |
| Small Film AS | Information & communication | 1997 |
| Smågahr AS | Real estate | 2021 |
| Smørskredtindane AS | Financial services | 2015 |
| Soco Invest AS | | 2018 |
| Sofela Eiendom AS | Real estate | 2017 |
| Software Integrated Governance Risk & Compliance AS | Information & communication | 2011 |
| Soja Holding AS | | 2025 |
| Solco Bygg AS | Construction | 1983 |
| Solhatt Consulting AS | Professional & scientific | 2020 |
| Soltun Racing AS | Agriculture & fishing | 2013 |
| Somaro Services AS | Information & communication | 2016 |
| Sorlie Solutions Holding AS | | 2025 |
| Sound Sector Gisle Tveito Da | Arts & recreation | 1989 |
| Spada AS | Professional & scientific | 2024 |
| Sparegris AS | Financial services | 2007 |
| Spildberg Inn Vest AS | | 2025 |
| Spor 14 AS | Arts & recreation | 2018 |
| Sports Branding AS | Wholesale & retail | 2018 |
| Sportscloud AS | Information & communication | 2013 |
| Spot on Invest AS | | 2016 |
| Springvalley AS | Real estate | 2005 |
| Stabekk Regnskapsservice AS | Professional & scientific | 1998 |
| Stall CBL AS | Real estate | 2014 |
| Starboy AS | Professional & scientific | 2017 |
| Starling AS | Professional & scientific | 2019 |
| Stauper Eiendom AS | Real estate | 2014 |
| Staxrud Holding AS | | 2019 |
| Stegg AS | | 2020 |
| Steinsholt Holding AS | Professional & scientific | 2023 |
| Stetind Holding AS | Wholesale & retail | 2020 |
| Stillastorget AS | Information & communication | 2022 |
| Stiller Norge AS | Information & communication | 2023 |
| Stinus AS | Professional & scientific | 2018 |
| Stinus Consulting AS | Professional & scientific | 2016 |
| Stiwi AS | Real estate | 2020 |
| Stoplight AS | Wholesale & retail | 1998 |