| Rinde Invest AS | Professional & scientific | 2021 |
| Rindegården AS | Real estate | 1992 |
| Rmatech AS | Information & communication | 2020 |
| Roalkvamhagen AS | Real estate | 2021 |
| Roheim Sag Og Trevirke AS | Manufacturing | 2001 |
| Roxy Kaffebar SA | Hospitality | 2021 |
| RTS (Rig Tech Solutions) AS | Other services | 2013 |
| Rulnes Invest AS | | 1999 |
| Rune Digranes Bøen AS | Wholesale & retail | 2024 |
| Ruttas AS | Financial services | 2005 |
| Rå Frisør AS | Other services | 2024 |
| Røa Holding AS | Real estate | 2007 |
| Rønningen Og Eek AS | Wholesale & retail | 2021 |
| Rønningsland Skogsdrift Da | Agriculture & fishing | 2022 |
| SA Kaasa Holding AS | Hospitality | 2005 |
| Sanda Camping Og Hytteutleie AS | Hospitality | 2001 |
| Sandavegen 15 Bø AS | Real estate | 2025 |
| Sandavegen 2 AS | Real estate | 2022 |
| Sandåkergården AS | Real estate | 1998 |
| Saxon Frisør AS | Other services | 2015 |
| Screen Graph AS | Manufacturing | 2015 |
| Seltveit Invest AS | Real estate | 2005 |
| Sentrum Vaskeri & Renhold AS | Administrative & support | 2005 |
| Sias Bygg AS | Real estate | 2009 |
| Simen Høgstad Maskinentreprenør AS | Construction | 2019 |
| Simonsen Mek AS | Manufacturing | 2018 |
| Simulatorgolf Bø AS | Administrative & support | 2022 |
| SJ Skilt Og Bildekor AS | Professional & scientific | 2026 |
| Skaltor AS | Professional & scientific | 2005 |
| Skinona AS | Health & social care | 2023 |
| Skrede Eiendom AS | Real estate | 2019 |
| Skrede Invest AS | Real estate | 2001 |
| Small Eigendom Og Vedlikehold AS | Real estate | 2023 |
| Smbf Holding AS | | 2023 |
| Smedstad Invest AS | | 2025 |
| Snurr Og Sprett Ans | Arts & recreation | 2001 |
| So Utleie AS | Other services | 2026 |
| Sot Holding AS | Real estate | 2014 |
| Spinning Wheels Band Da | Arts & recreation | 2017 |
| Sport 1 Glexe AS | Wholesale & retail | 2011 |
| SSM Holding AS | | 2022 |
| Standard Bio AS | Professional & scientific | 2010 |
| Stasjonsbua AS | Hospitality | 2019 |
| Stebi AS | Other services | 2017 |
| Steintøy Og Parfymeri AS | Wholesale & retail | 1962 |
| Stelu Holding AS | Hospitality | 2015 |
| Stenstad Holding AS | Wholesale & retail | 2021 |
| Stephan Eiendom AS | Real estate | 2018 |
| Sterk Entreprenør AS | Construction | 2021 |
| Sterk Gruppen AS | Construction | 2021 |
| Sterk Utleie AS | Administrative & support | 2021 |
| Strandgata 23 Restauranthus AS | Hospitality | 2009 |
| Strangetek Studio AS | Information & communication | 2026 |
| Stugumoen Eiendom AS | | 2018 |
| Stølan Eiendom AS | Construction | 2018 |
| Stølan Utvikling AS | Wholesale & retail | 2015 |
| Subcooler AS | Wholesale & retail | 2020 |
| Sum Yee Restaurant &Bar AS | Hospitality | 2017 |
| Sund Invest AS | Financial services | 2005 |
| Sunde Renovasjon & Gjenvinning AS | Water & waste | 1992 |
| Superbil AS | Transport & logistics | 2025 |
| Superbruker AS | Education | 2023 |
| Superlativ Media AS | Professional & scientific | 2011 |
| Svein Haugen AS | Real estate | 1984 |
| Sveinsson Invest AS | Real estate | 2016 |
| Sycompagniet Sissel | Wholesale & retail | 1999 |
| Syncmap AS | Information & communication | 2025 |
| Synthesis Interim AS | Professional & scientific | 2025 |
| Systemblokk AS | Manufacturing | 2014 |
| Sæther Og Bakås Eiendom Da | Real estate | 1989 |
| Sønstebø Drift AS | Wholesale & retail | 2012 |
| Sør-Øst Taksering AS | Professional & scientific | 2022 |
| T. Dorholt Maskin AS | Construction | 2022 |
| Tallknusing Og Baksidebygging AS | | 2019 |
| Tannlege Halvor I. Holtan AS | Health & social care | 2015 |
| Tauros AS | Professional & scientific | 2018 |
| TBH 10 Invest AS | | 2025 |
| Team Telemark Eiendom AS | Real estate | 2012 |
| Tegnekontoret G. Hagen AS | Professional & scientific | 2014 |
| Tele-Mat Lunde AS | Professional & scientific | 1986 |
| Telemark Alpin AS | Professional & scientific | 2012 |
| Telemark Betongpuss Og Forskaling AS | Construction | 1999 |
| Telemark Dagligvare AS | Real estate | 2014 |
| Telemark Dagligvare Edland AS | Wholesale & retail | 2014 |
| Telemark Dagligvare Åmot AS | Wholesale & retail | 2014 |
| Telemark Elektroservice AS | Other services | 2008 |
| Telemark Handel AS | Wholesale & retail | 2025 |
| Telemark Hyttevask AS | Administrative & support | 2019 |
| Telemark Kompetansebygg AS | Real estate | 1989 |
| Telemark Miljøsand AS | Wholesale & retail | 2010 |
| Telemark Sparebank | Financial services | 1935 |
| Telemark Trade AS | Wholesale & retail | 1994 |
| Telemark Traktor & Maskin AS | Wholesale & retail | 2003 |
| Telemarkspro AS | Construction | 2023 |
| Telemarksvindu AS | Construction | 2020 |
| Temm AS | Real estate | 2005 |
| Tengesdal Entreprenør AS | Construction | 2021 |
| The Bull Inn AS | Hospitality | 2010 |
| The Roots AS | Hospitality | 1990 |
| Thorv Holding AS | | 2025 |