| Sluppan Dagligvare AS | Wholesale & retail | 1995 |
| SMT Holding AS | | 2019 |
| Smørfabrikken AS | Real estate | 2019 |
| Snøaas - Braaten AS | Transport & logistics | 2018 |
| Solberg Stål Og Tre AS | Manufacturing | 2025 |
| Solen Eiendom AS | Real estate | 2015 |
| Solend Haugholt Holding AS | Administrative & support | 2023 |
| Solåsen 1 H AS | Real estate | 2023 |
| Somnomedics Nordics AS | Wholesale & retail | 2017 |
| Sondre Olsen Holding AS | | 2022 |
| Speaker Holding AS | Manufacturing | 1983 |
| Spilloppene Agenturer AS | Wholesale & retail | 2013 |
| Spillorama Kragerø AS | Arts & recreation | 1995 |
| Spirit by Stephanie AS | Health & social care | 2020 |
| Splint AS | Education | 2006 |
| Sport 1 Kragerø AS | Wholesale & retail | 2001 |
| Sports Group Norway AS | Wholesale & retail | 2018 |
| Sports Group Norway Holding AS | Wholesale & retail | 2022 |
| SSB Invest AS | | 2023 |
| Stavelin Kragerø Sentrum AS | Hospitality | 2020 |
| Stein På Stein Holding AS | Professional & scientific | 2021 |
| Stilk Drift AS | Wholesale & retail | 2025 |
| Stilk Eiendom AS | Real estate | 2024 |
| Stilk Holding AS | Real estate | 2024 |
| Stokkevannveien 17 AS | Real estate | 2006 |
| Stopp En Halv AS | Hospitality | 1996 |
| Storgata 13 Kragerø AS | Real estate | 2013 |
| Storgata 21A AS | Real estate | 2024 |
| Strandsveien 4 AS | Real estate | 1997 |
| Strings and Skins AS | Administrative & support | 2024 |
| Strå AS | Other services | 2024 |
| Strå Holding AS | Real estate | 2010 |
| Strå Hudklinikk AS | Other services | 2025 |
| Støperiet Drift AS | Hospitality | 2025 |
| Støperiet Eiendom AS | Real estate | 2022 |
| Sum-It AS | Financial services | 2011 |
| Sydama AS | Manufacturing | 2016 |
| Systems Resource Lab AS | Professional & scientific | 2023 |
| Taca AS | Financial services | 2013 |
| Tak Holding AS | Real estate | 2008 |
| Tangent Artist AS | Information & communication | 2019 |
| Tannlege Kristin T. Hegdahl AS | Health & social care | 2015 |
| Tannlegene Ask AS | Health & social care | 2014 |
| Taros Eiendom AS | Real estate | 2006 |
| Tasty Eiendom Kragerø AS | Real estate | 2014 |
| Tasty Kragerø AS | Hospitality | 2010 |
| Tegneriet Bygg Og Interiørdesign AS | Professional & scientific | 2013 |
| Telemark Meglerinvest AS | Real estate | 2020 |
| Telemarksmegleren AS | Real estate | 2003 |
| Tema Invest AS | Wholesale & retail | 1995 |
| Terba Holding AS | Real estate | 2014 |
| Terkri AS | | 2020 |
| Thai Street Food Take Away AS | Hospitality | 2024 |
| Theonor AS | Real estate | 2005 |
| Thermex Global AS | Manufacturing | 2012 |
| Thjo AS | Construction | 2019 |
| Thmo Holding AS | | 2026 |
| Thoresen Bygg AS | Construction | 2021 |
| Tinas Wok AS | Hospitality | 1999 |
| Tiwa Eiendom AS | Real estate | 2015 |
| Tjernvegen 4 AS | Real estate | 2014 |
| Tollboden Eiendomsselskap AS | Real estate | 1987 |
| Tom Carlsen AS | Construction | 2010 |
| Tor Jevne Service AS | Arts & recreation | 2021 |
| Torvgata 3-5 AS | Real estate | 2020 |
| Torvgata 6 Eiendom AS | Real estate | 2022 |
| Torvgata Eiendom AS | Real estate | 2006 |
| Toti AS | Real estate | 2026 |
| Trening Er Medisin AS | Health & social care | 2013 |
| Trikotasjen Eiendom AS | Real estate | 1986 |
| Trimhuset Da | Arts & recreation | 1996 |
| Trinse AS | Information & communication | 2015 |
| Trondheimsveien 43 I AS | Real estate | 2021 |
| Tullas Catering AS | Hospitality | 2025 |
| Tåtøy Eiendom AS | Real estate | 2006 |
| Tåtøy Hovedgård AS | Real estate | 2014 |
| Tømrermester Andreas Risøy AS | Construction | 2018 |
| Uroskolen Sør Norge AS | Education | 2020 |
| Vadfoss Eiendom AS | Construction | 1980 |
| Vadfoss Transport & Maskin AS | Construction | 1981 |
| Vafos Pulp AS | Manufacturing | 2012 |
| Vaktmester Andresen AS | Administrative & support | 2021 |
| Vestmar Holding AS | Wholesale & retail | 2015 |
| Vestmar Nett AS | Energy | 1997 |
| Vestmar Rør AS | Construction | 2003 |
| Vestmar Stillas AS | Administrative & support | 2024 |
| Vestøl Herre Og Ungdomsklær AS | Wholesale & retail | 2005 |
| VIA2 AS | | 2018 |
| Viatann AS | Professional & scientific | 2004 |
| Vibo Invest AS | Wholesale & retail | 2005 |
| Victoria Hotel Kragerø AS | Hospitality | 2021 |
| Vilene Invest AS | Real estate | 2011 |
| Volum Frisør AS | Other services | 2010 |
| Vra AS | Administrative & support | 2022 |
| Vrimle AS | Education | 2021 |
| WDC Invest AS | Financial services | 2022 |
| Wifo Eiendom AS | Real estate | 2019 |
| Wiik Fysio AS | Health & social care | 2016 |
| Wilma AS | Real estate | 2016 |
| Ytre Strandvei 1-3 AS | Real estate | 2020 |