| Storgata 23 Larvik AS | Real estate | 2020 |
| Storgata 43 Larvik AS | Real estate | 2019 |
| Storgata 46 Larvik AS | Real estate | 2012 |
| Storgata 48 Larvik AS | Real estate | 2008 |
| Storgata 65 Notodden AS | Real estate | 2026 |
| Storgata 9-11 Larvik AS | Real estate | 2018 |
| Storgata Pub AS | Hospitality | 2017 |
| Storgaten 13 AS | Real estate | 2016 |
| Storhaug Maskinentreprenør AS | Construction | 2014 |
| Storviken Tak Og Bygg AS | Construction | 2020 |
| STR Maritim Invest AS | Wholesale & retail | 2015 |
| Strand Boligbygg AS | Real estate | 2010 |
| Strandinga Invest AS | Real estate | 2020 |
| Strandsitter AS | | 2019 |
| Strandstua AS | Hospitality | 1977 |
| Stridsklev Eiendom AS | Real estate | 1994 |
| Strike Invest AS | Arts & recreation | 2011 |
| Stril Invest AS | Professional & scientific | 2022 |
| Structured Business and Management AS | Administrative & support | 2023 |
| STS Invest AS | Financial services | 2005 |
| Stubberød Eiendom AS | Real estate | 1999 |
| Studio Frisør AS | Other services | 2016 |
| Studio S Larvik AS | Wholesale & retail | 2026 |
| Studio Skala AS | Professional & scientific | 2019 |
| Style Frisør & Velvære AS | Other services | 2016 |
| Styrvold Eiendom AS | Real estate | 2021 |
| Styrvold Holding AS | Real estate | 2021 |
| Stål Og Fasademontasje AS | Construction | 1991 |
| Støtvig & Co AS | Construction | 2026 |
| Støvland AS | Professional & scientific | 2020 |
| Støvland Eiendom AS | Construction | 2023 |
| Støvland Holding AS | Professional & scientific | 2015 |
| Subtech Da | Construction | 2003 |
| Sukkertoppen-Consult AS | Professional & scientific | 2017 |
| Sundland Næringspark AS | Real estate | 1998 |
| Suntaq Solutions AS | Information & communication | 2020 |
| Suzanne Holding AS | | 2019 |
| SV50 Invest AS | | 2025 |
| Svanen Renhold AS | Administrative & support | 2018 |
| Svean Design AS | Professional & scientific | 2008 |
| Sveberg Assistanse AS | Professional & scientific | 2004 |
| Svein Haugen Transport AS | Transport & logistics | 1996 |
| Sveitserhus AS | Construction | 2025 |
| Svend Hoyer AS | Wholesale & retail | 1997 |
| Svenner Eiendomsinvest AS | Real estate | 2022 |
| Svenner-Eiendom AS | Real estate | 2021 |
| Svenner-Holding AS | Construction | 2021 |
| Sverre TH Gutterød Gartneri AS | Agriculture & fishing | 1996 |
| Svindal Larsen Holding AS | Administrative & support | 2015 |
| Svinesundparken AS | Real estate | 2017 |
| Sylskarp Barber Salong Larvik AS | Other services | 2016 |
| Synergica AS | Information & communication | 2012 |
| Synkonie AS | Real estate | 2005 |
| Søb AS | Professional & scientific | 2016 |
| Sølvhandel AS | Wholesale & retail | 2022 |
| Sølyst Rådgiving AS | Professional & scientific | 2019 |
| Søndeled Prosjekt AS | Real estate | 2025 |
| Søndersrød Holding VBH AS | Real estate | 2016 |
| Søndre Gjernes Eiendomsutvikling AS | Real estate | 2022 |
| Søndre Lunde Rør & Utleie AS | Construction | 2019 |
| Søndre Viken AS | Real estate | 1996 |
| Sønsebergveien 1-7 Helgeroa AS | Real estate | 2019 |
| Sørbølfjell Utvikling AS | Construction | 2017 |
| Sørenco AS | Real estate | 2004 |
| Sørlandske Div AS | Hospitality | 2015 |
| Sørlandsstigen AS | Manufacturing | 2001 |
| Sørum Eiendom AS | Real estate | 1988 |
| Sørum Trevare AS | Wholesale & retail | 1994 |
| Søt Produkter AS | Agriculture & fishing | 2015 |
| T & B Eiendom AS | Real estate | 2007 |
| T & T Sakura Sushi AS | Hospitality | 2019 |
| T Andersen Billakkering AS | Other services | 1998 |
| T E Transport AS | Transport & logistics | 2006 |
| T Era AS | Real estate | 1998 |
| T Sandvik Holding AS | | 2019 |
| T Simonsen AS | Wholesale & retail | 1988 |
| T-C Invest AS | Transport & logistics | 2021 |
| T. Thorstensen Eiendom AS | Real estate | 2020 |
| T. Thorstensen Holding AS | Real estate | 2020 |
| T.A Holding AS | | 2022 |
| T.A.I. Holding AS | | 2026 |
| Ta Investco AS | | 2022 |
| Ta Takst Og Eiendom AS | Professional & scientific | 2020 |
| Taide AS | Professional & scientific | 2013 |
| Taka Holding AS | Professional & scientific | 2023 |
| Tams Invest AS | Construction | 2005 |
| Tandberg AS | Professional & scientific | 2023 |
| Tandberg Engineering AS | Professional & scientific | 2018 |
| Tandberg Invest AS | Manufacturing | 2014 |
| Tandbergs Bildeler AS | Wholesale & retail | 1992 |
| Tanja Stålaker Fysioterapi AS | Health & social care | 2014 |
| Tann & Kjeveklinikken AS | Real estate | 1993 |
| Tannklinikken Nansetgata AS | Health & social care | 2019 |
| Tannlege Fagerbakke Holding AS | Health & social care | 2016 |
| Tannlege Henning Myhre AS | Health & social care | 1994 |
| Tannlege Jon Eriksen AS | Health & social care | 2015 |
| Tannlege Nikolov AS | Health & social care | 2020 |
| Tannlege Silje Eikre AS | Health & social care | 2013 |
| Tannlegegården Nansetgata AS | Real estate | 2018 |
| Tannlegene Rustad AS | Health & social care | 2021 |