| STORGATA10A AS | Real estate | 2025 |
| Storgaten 14 AS | Real estate | 1963 |
| Storgaten 16 AS | Real estate | 1948 |
| Storgaten 18 Sandefjord AS | Real estate | 1999 |
| Storgaten 4 Sandefjord AS | Real estate | 2008 |
| Storgaten 6 Sandefjord AS | Real estate | 2001 |
| Storm Betong AS | Construction | 2021 |
| Storm Entreprenør AS | Construction | 2021 |
| Storm Halvorsen AS | Wholesale & retail | 1988 |
| Storm Håndverk AS | Construction | 2024 |
| Storm Prismerking AS | Manufacturing | 1983 |
| Storm Stål AS | Construction | 2024 |
| Stormgruppen AS | Real estate | 2023 |
| Stram Vaier AS | Arts & recreation | 2022 |
| Strand Byggpartner AS | Construction | 2019 |
| Strand Byggrådgivning AS | Construction | 2021 |
| Strand Fasade AS | Construction | 2016 |
| Strand Gartneri AS | Agriculture & fishing | 2005 |
| Strand Group AS | Real estate | 1993 |
| Strand Nordre Vann- Og Avløp SA | Water & waste | 2021 |
| Strand Støyskjerming AS | Construction | 2018 |
| Strand Utvikling AS | Real estate | 2019 |
| Strandberg Bygg & Vedlikehold AS | Construction | 2025 |
| Strandgat AS | Real estate | 2013 |
| Stratum Holding AS | | 2026 |
| Strax Norway AS | Wholesale & retail | 2011 |
| Stream Side Service Andersen & Kristoffersen | Wholesale & retail | 1985 |
| Street Food Norway AS | Hospitality | 2020 |
| Strekenholding AS | | 2023 |
| Strikkebua Sandefjord AS | Wholesale & retail | 2016 |
| Stromo Invest AS | Financial services | 2017 |
| Structor Vestfold AS | Professional & scientific | 2017 |
| Strøm-Normann Helse AS | Health & social care | 2016 |
| Strømøy Racing AS | Arts & recreation | 2013 |
| Stub Brygger AS | Arts & recreation | 2005 |
| Stub Eiendom AS | Real estate | 1982 |
| Studio 3 Ans | Arts & recreation | 2003 |
| Studio L Larvik AS | Other services | 2025 |
| Studio L Sandefjord AS | Other services | 2018 |
| Studio Lille Sandefjord AS | Education | 2025 |
| Stusab Norge AS | Real estate | 2021 |
| Style by Isabelle AS | Professional & scientific | 2018 |
| Ståleriet AS | Manufacturing | 2020 |
| Stålis AS | Real estate | 2023 |
| Sublease AS | Real estate | 2018 |
| Summertime AS | | 2023 |
| Sun Management Invest AS | Information & communication | 2007 |
| Sundby Helse Invest AS | Health & social care | 2005 |
| Sunde Maritime Consulting AS | Professional & scientific | 2024 |
| Sunn Fornuft Holding AS | Information & communication | 2019 |
| Sunnic Norge AS | Real estate | 2000 |
| Supervisuell AS | Information & communication | 2014 |
| Susnic AS | Real estate | 2013 |
| Sustequity AS | | 2019 |
| Suwerte AS | Real estate | 2005 |
| Svanelaboratoriet AS | Manufacturing | 1998 |
| Svanåsbakken Holding AS | | 2025 |
| Svarttrost Smie AS | Manufacturing | 2020 |
| Svein Halvdan Aashammer AS | Transport & logistics | 2022 |
| Svein Johansen AS | Wholesale & retail | 1991 |
| Svein Sørensen Invest AS | Other services | 2005 |
| Sven Erik Sandnes AS | Real estate | 2013 |
| Svendsen & Henriksen Da | Arts & recreation | 2026 |
| Svenner Bidco AS | Wholesale & retail | 2023 |
| Svensen Eiendom AS | Real estate | 1979 |
| Svenssen Esg AS | Professional & scientific | 2017 |
| Sverdstad Renhold AS | Administrative & support | 2018 |
| Sverstad Barnehage AS | Education | 2006 |
| Svkm Holding AS | | 2022 |
| Swan Invest AS | Real estate | 2010 |
| Swan Spa AS | Other services | 2025 |
| Swell Holding AS | Real estate | 2016 |
| Switchback Consulting AS | Information & communication | 2026 |
| Sydbygg AS | Construction | 2025 |
| Sydenbooking AS | Real estate | 2020 |
| Sykkel Og Motor AS | Other services | 2026 |
| Sylskarp Sandefjord AS | Other services | 2020 |
| Syningen T21 AS | Construction | 2020 |
| Synkløft AS | Construction | 2017 |
| Syrr Eigedom Invest AS | Real estate | 1997 |
| Sølvknuten Næring AS | Real estate | 2005 |
| Søndersrød AS | Real estate | 2018 |
| Søndre Bygg AS | Real estate | 1984 |
| Søndre Drift AS | Real estate | 2010 |
| Søndre Eiendom 1 AS | Real estate | 1998 |
| Søndre Eiendom 10 AS | Real estate | 2007 |
| Søndre Eiendom 11 AS | Real estate | 2005 |
| Søndre Eiendom 12 AS | Real estate | 2022 |
| Søndre Eiendom 2 AS | Real estate | 1985 |
| Søndre Eiendom 3 AS | Real estate | 2005 |
| Søndre Eiendom 5 AS | Real estate | 2007 |
| Søndre Eiendom 7 AS | Real estate | 2008 |
| Søndre Eiendom 8 AS | Real estate | 2010 |
| Søndre Eiendom 9 AS | Real estate | 2003 |
| Søndre Eiendom AS | Real estate | 2005 |
| Søndre Kullerød 1 AS | Real estate | 2003 |
| Søndre Kullerød 6 AS | Real estate | 2003 |
| Søndre Mefjordveien Avløpslag SA | Water & waste | 2026 |
| Sønnafjells AS | Real estate | 2012 |
| Sør Maskin AS | Construction | 2009 |