| Sitting Scandinavia AS | Wholesale & retail | 2013 |
| Siv Ing Braathen-Sømme AS | Professional & scientific | 2014 |
| Siv. Ing. Stener Sørensen AS | Professional & scientific | 2014 |
| Siveco Invest AS | Financial services | 1997 |
| Sivi Invest AS | | 2026 |
| Sivilarkitekt Mnal Peder Blindheim AS | Professional & scientific | 2006 |
| Sivilingeniør Kolloen AS | Professional & scientific | 2024 |
| Sivilingeniør Olaf Rømcke AS | Professional & scientific | 2022 |
| Sivilingeniør Will Arentz AS | Professional & scientific | 2002 |
| Siviløkonom Nils Sverreson AS | Professional & scientific | 2026 |
| Siviløkonom Per Øyvind Trydal AS | Professional & scientific | 2005 |
| Siwar AS | Transport & logistics | 2026 |
| Sjakkbutikken AS | Wholesale & retail | 2023 |
| Sjetne-Låg Invest AS | Financial services | 2015 |
| Sjømatbilen AS | Wholesale & retail | 2019 |
| SK Pluss AS | Financial services | 2005 |
| Skalleknarpen Invest AS | | 2020 |
| Skalpe Eiendom AS | Real estate | 2019 |
| Skalpe Holding AS | Real estate | 1997 |
| Skalstadskogen 1 Utvikling AS | Real estate | 2017 |
| Skalstadskogen 2 Utvikling AS | Real estate | 2017 |
| Skanpol AS | Administrative & support | 2026 |
| Skanrise AS | | 2018 |
| Skapet Av M Forlag Og Organiseringskonsulenter AS | Information & communication | 2019 |
| Skardstind AS | Financial services | 2016 |
| Skarra Holding AS | Real estate | 2012 |
| Skarra Takst AS | Professional & scientific | 2015 |
| Skattekisten Barnehage SA | Education | 2001 |
| Skeidar Drammen AS | Wholesale & retail | 1998 |
| Skeide AS | Professional & scientific | 2022 |
| SKG Emballasje AS | Wholesale & retail | 2008 |
| Skigard Invest AS | Real estate | 2017 |
| Skiheis Holding AS | | 2025 |
| Skilt Design AS | Manufacturing | 1989 |
| Skimten AS | | 2023 |
| Skin Cosmetic AS | Health & social care | 2011 |
| Skin Well AS | Other services | 2018 |
| Skinbyyou AS | Other services | 2019 |
| Skinclinic Drammen AS | Other services | 2022 |
| Skindeep AS | Other services | 2014 |
| Skippervik AS | Real estate | 2004 |
| Skjelderumskogen Da | Agriculture & fishing | 1994 |
| Skjelsbæk Invest AS | Manufacturing | 2005 |
| Skjenkestua AS | Hospitality | 2011 |
| Skjennum Holding AS | Real estate | 2023 |
| Skjæret 1 AS | Construction | 2016 |
| Skogavakse AS | Real estate | 2020 |
| Skoger Brøyteservice AS | Administrative & support | 2018 |
| Skoger Samdrift AS | Agriculture & fishing | 2024 |
| Skoger Utemiljø AS | Administrative & support | 2012 |
| Skoger Vann Og Avløp AS | Construction | 2002 |
| Skogholt Eiendomsselskap AS | Real estate | 2022 |
| Skogholt Hanskefabrikk AS | Wholesale & retail | 2022 |
| Skogholt Yrkesbekledning AS | Wholesale & retail | 2022 |
| Skoglyklinikken AS | Health & social care | 2012 |
| Skogshorn Holding AS | Information & communication | 2005 |
| Skogvold-Knutsen Holding AS | Real estate | 2017 |
| Skollenborg Kraftverk Da | Energy | 1978 |
| Skop Bygg AS | Real estate | 2020 |
| Skousen Drammen AS | Wholesale & retail | 2015 |
| Skram Boligservice AS | Administrative & support | 2021 |
| Skramstadcorp AS | Arts & recreation | 2026 |
| Skriveakademiet AS | Education | 2022 |
| Skur 7 AS | Real estate | 2021 |
| Sky Fitness Drammen AS | Arts & recreation | 2017 |
| Skyagro AS | Professional & scientific | 2026 |
| Skybasert Regnskap AS | Professional & scientific | 2019 |
| Skydent AS | Health & social care | 2020 |
| Skynovation AS | Information & communication | 2021 |
| Skytesport AS | Wholesale & retail | 2006 |
| Skytesport Holding AS | Wholesale & retail | 2005 |
| Skålin Invest AS | Real estate | 2015 |
| Slagenveien 16 AS | Real estate | 2020 |
| Slettvoll Drammen AS | Wholesale & retail | 1969 |
| Slice of Norge AS | Hospitality | 2024 |
| Slotsvig Invest AS | | 2023 |
| SLV Holding AS | Financial services | 2005 |
| Smak Gatekjøkken AS | Hospitality | 2013 |
| Smak Invest AS | Real estate | 2009 |
| Smaken Fra Havet AS | Wholesale & retail | 2019 |
| Smakslykke CC Drammen AS | Wholesale & retail | 2022 |
| Smakslykke.No AS | Wholesale & retail | 2021 |
| Smart Ekspress Monter AS | Construction | 2026 |
| Smart Levering AS | Professional & scientific | 2016 |
| Smart Shop AS | | 1945 |
| Smarte Hjem Drammen AS | Real estate | 2019 |
| Smarte Løsninger AS | Wholesale & retail | 2017 |
| Smartins Holding AS | | 2019 |
| Smartregnskap AS | Professional & scientific | 2008 |
| SMARTRENS1 AS | Other services | 2021 |
| Smashville AS | Hospitality | 2022 |
| SMD Media AS | Professional & scientific | 2024 |
| Sme Consulting AS | Professional & scientific | 2020 |
| Smedaas AS | Real estate | 2011 |
| Smedaas Rådgivning AS | Administrative & support | 2021 |
| Smedbo Holding AS | | 2020 |
| Smertefri AS | Information & communication | 2025 |
| Smetbak Holding AS | Financial services | 2015 |
| Smi Snow Makers AS | Wholesale & retail | 2000 |
| Smidig Utvikling AS | Information & communication | 2025 |