| Sanna Holding AS | | 2019 |
| Sars Invest AS | Wholesale & retail | 2014 |
| Scandic Express AS | Transport & logistics | 2018 |
| Scandinaviansail AS | Wholesale & retail | 2025 |
| Schwantrans AS | Transport & logistics | 2007 |
| SD Utvikling AS | Real estate | 2015 |
| Seljeveien 2 AS | Real estate | 2020 |
| Seniorbank Utvikling Ans | Administrative & support | 2003 |
| Sentrum Vest AS | Real estate | 2007 |
| Serviceveien 1 AS | Real estate | 2006 |
| Serviceveien 6 AS | Real estate | 2015 |
| Serviceveien 8 AS | Real estate | 2018 |
| Sether AS | Wholesale & retail | 2024 |
| Sether Eiendom AS | Real estate | 2007 |
| Setskog Eiendom AS | Real estate | 1996 |
| Setten Hyttepark SA | Real estate | 2024 |
| SH Maskin Og Eiendom AS | | 2024 |
| SH Rogne AS | | 2023 |
| Shanghai House Bjørkelangen AS | Hospitality | 2015 |
| Sia SK Events Nuf | Professional & scientific | 2026 |
| Sigma Holdings AS | Real estate | 2005 |
| Sigma Regnskap AS | Professional & scientific | 1998 |
| Sikker Jobb Service AS | Administrative & support | 2021 |
| Skjermo AS | Wholesale & retail | 1987 |
| Skjønhaug Bygg AS | Construction | 2025 |
| Skjønhaug Eiendom AS | Real estate | 2017 |
| Skjønhaug Holding AS | Real estate | 2017 |
| Skjønhaug Transport AS | Transport & logistics | 2025 |
| Skrepstad Holding AS | | 2024 |
| Slitu 1 AS | Real estate | 2020 |
| SM Berger Eiendom AS | Real estate | 2022 |
| Smestadtoppen Bolig Og Utleie AS | Real estate | 2019 |
| Smico AS | Information & communication | 2017 |
| Solholmen Øst AS | Real estate | 2016 |
| Solident AS | Health & social care | 1988 |
| Solsiden Terrasse AS | Real estate | 2025 |
| Solum Produkter AS | Manufacturing | 1992 |
| Spar Consult AS | Professional & scientific | 2020 |
| ST Elektro AS | Construction | 2003 |
| Stang Skog Da | Agriculture & fishing | 2008 |
| Stasjonsveien 31 AS | Real estate | 2017 |
| Stefi AS | Real estate | 2013 |
| Stenbæk Invest AS | Financial services | 2005 |
| Sterkr Elektro AS | Construction | 2024 |
| Stian M. Berger AS | | 2025 |
| Sval Consult AS | Professional & scientific | 2025 |
| Svewe Akk & Ved AS | Manufacturing | 2022 |
| Sørhaug Service AS | Other services | 2014 |
| Tab Gruppen AS | Real estate | 2012 |
| Tab Hytteutvikling AS | Real estate | 2021 |
| Tab Næringseiendom AS | Real estate | 2013 |
| Tab Næringsutleie AS | Real estate | 2013 |
| Tannlege Siri Mette Herrem AS | Health & social care | 2025 |
| Tenk Regnskap AS | Professional & scientific | 2024 |
| Terje Bjøranger AS | Education | 2025 |
| Tertitten Elektro AS | Wholesale & retail | 2010 |
| Tertitten Holding AS | Wholesale & retail | 2018 |
| Testamenthjelp AS | Professional & scientific | 2022 |
| Timo Klær AS | Wholesale & retail | 2016 |
| Tinius Bilsenter AS | Wholesale & retail | 2022 |
| Tinius Bilsenter Bjørkelangen AS | Wholesale & retail | 2024 |
| Tinius Gruppen AS | Wholesale & retail | 2018 |
| Tippehjørnet Bjørkelangen AS | Arts & recreation | 2020 |
| To K AS | Real estate | 2024 |
| Tom Holger Litzheim Holding AS | Real estate | 2018 |
| Tommy Og Rune's Renhold Ans | Administrative & support | 2003 |
| Torand AS | Real estate | 2026 |
| Torggata 43 Holding AS | | 2026 |
| Torggt. 43 AS | Real estate | 2022 |
| Torvveien Syd AS | Real estate | 2024 |
| Trivsel Invest AS | Wholesale & retail | 2012 |
| Tsunami Sushi AS | Hospitality | 2019 |
| Turssons Bygg AS | Construction | 2014 |
| Vam Lunde Holding AS | Construction | 2020 |
| Vargtass AS | Real estate | 2005 |
| Vendel Auto AS | Wholesale & retail | 2022 |
| Vestby B4 AS | Real estate | 2022 |
| Vestby B5 AS | Real estate | 2022 |
| Vestreng Eiendom AS | Construction | 2023 |
| Via Rør AS | Construction | 2025 |
| Vårli Invest AS | | 2025 |
| Wanax Forlag Da | Information & communication | 2023 |
| We-Ma Eiendom AS | Real estate | 2017 |
| Wepe Regnskap AS | Professional & scientific | 1996 |
| Westreng Holding AS | Real estate | 2013 |
| Westreng Maskinsenter AS | Administrative & support | 2026 |
| Wito Øst AS | Professional & scientific | 2012 |
| Yrc AS | Wholesale & retail | 2019 |
| Zolu Invest AS | Professional & scientific | 2020 |
| Åsheim Consulting Invest AS | Agriculture & fishing | 2021 |
| Øfv Invest AS | | 2025 |
| Østervallskogs Allteknik AB | Construction | 2002 |
| Østre Blixrudvei 1 AS | Real estate | 2017 |
| Øyvind Kongtorp Lier Holding AS | | 2020 |