| Alk Nor AS | Wholesale & retail | 1997 |
| Allum Transport AS | Transport & logistics | 1990 |
| Aurum Invest AS | Real estate | 1999 |
| Auto'N Eiendom AS | Real estate | 2021 |
| Auto'N Holding AS | Wholesale & retail | 2019 |
| Barnas Antikvariat Og Bokhandel Da | Wholesale & retail | 1995 |
| Bimfront AS | Professional & scientific | 2021 |
| Blücher Norway AS | Wholesale & retail | 1992 |
| Bo Og Leie AS | Real estate | 2015 |
| Borgersen Dagligvare AS | Wholesale & retail | 2017 |
| Borgersen Design AS | Wholesale & retail | 2024 |
| Borgersen Holding AS | | 2021 |
| Brennemo Eiendom AS | Real estate | 2014 |
| Briskelund Holding AS | | 2025 |
| Brunost Vintage Holding AS | Wholesale & retail | 2022 |
| Brunost Vintage Skien AS | Wholesale & retail | 2022 |
| BT Salg & Montasje AS | Wholesale & retail | 2017 |
| BV32 Invest AS | | 2021 |
| Bygg Faktum AS | Construction | 2019 |
| Bygg Faktum Øst AS | Construction | 2022 |
| Byggmester.Hagen AS | Construction | 2021 |
| CB International AS | Financial services | 2006 |
| Communicationflow AS | Professional & scientific | 2017 |
| E. Refsdal Holding AS | | 2023 |
| Ekeberg Auto AS | Wholesale & retail | 2019 |
| Ekli Betongservice AS | Construction | 2026 |
| Elektrogruppen Invest Da | Financial services | 2003 |
| Elite Auto AS | Real estate | 2008 |
| Falkum Invest AS | Real estate | 1994 |
| Flatins Bakeri AS | Manufacturing | 1985 |
| Flex Siljan AS | Arts & recreation | 2018 |
| Foodie Ventures AS | Hospitality | 2019 |
| Fritzøe Skoger AS | Agriculture & fishing | 2022 |
| Grindrud Holding AS | | 2025 |
| Gurholt AS | Professional & scientific | 2005 |
| Hellestvedt Bruk AS | Agriculture & fishing | 1916 |
| HJELPER1 AS | Wholesale & retail | 2015 |
| Hogstad Holding AS | | 2026 |
| Holte Vekst AS | Real estate | 2021 |
| Holtesletta Eiendom AS | Real estate | 2010 |
| I. Øverbø Holding AS | | 2019 |
| Industrivegen Siljan AS | Real estate | 2019 |
| Jakobsen Consult AS | Professional & scientific | 2011 |
| Kha Maskin AS | Construction | 2017 |
| Kiste AS | Wholesale & retail | 2021 |
| Kjell Olav Høiseth Transport AS | Transport & logistics | 2014 |
| Koobe AS | Education | 2021 |
| Krogseth Holding AS | Real estate | 2021 |
| Kronhjort AS | Agriculture & fishing | 2013 |
| Larsen Maskintjenester Holding AS | Administrative & support | 2025 |
| Lett Media AS | Professional & scientific | 2026 |
| Lindland Holding AS | Construction | 2019 |
| Luggen Holding AS | | 2025 |
| Lund - I Landskapets Tjeneste Ans | Professional & scientific | 2009 |
| Lunder Holding AS | Real estate | 2005 |
| Maxmaling AS | Construction | 2024 |
| Mesterbygg Grenland AS | Construction | 2021 |
| Mobaek Holding AS | | 2024 |
| Mobaek Invest AS | | 2024 |
| Molid & Kristensen Holding AS | | 2022 |
| Naturconsult Larsson AS | Professional & scientific | 2014 |
| Nicro AS | Manufacturing | 1973 |
| Opplev Siljan AS | Wholesale & retail | 2026 |
| Overnic Invest AS | Financial services | 2017 |
| Pit Stop Lunde AS | Wholesale & retail | 2014 |
| Popjazzonline.Com AS | Education | 2015 |
| Prestejordet AS | Financial services | 2014 |
| Raph Holding AS | | 2024 |
| Siljan Nødslakt Service AS | Manufacturing | 2007 |
| Siljanhjort AS | Agriculture & fishing | 2004 |
| Silverfir Invest AS | Real estate | 2013 |
| Skilbred Mur AS | Construction | 2025 |
| Skogservice AS | Wholesale & retail | 1992 |
| Snurråsen Familiebarnehage Ans | Education | 1995 |
| Stensrød Invest AS | | 2025 |
| Strømme Media AS | Professional & scientific | 2025 |
| Svartangen Maskin AS | Construction | 2015 |
| SW Service AS | Professional & scientific | 2024 |
| T. Aspheim Holding AS | | 2023 |
| Team Rustfritt AS | Real estate | 1997 |
| Telemark Regnskap AS | Professional & scientific | 2022 |
| Telemark Rørservice AS | Construction | 2024 |
| Telemark Trepleie AS | Agriculture & fishing | 2006 |
| Terje Jahnsen Holding AS | | 2020 |
| Thomas Jakobsen AS | Transport & logistics | 2000 |
| Togs Holding AS | | 2026 |
| Top Gear Auto Ans | Wholesale & retail | 2005 |
| Torgeir Tysnes AS | | 2026 |
| Trafikkpartner AS | Education | 2026 |
| Tudal Eiendom AS | Real estate | 2016 |
| Tudal Maskin AS | Wholesale & retail | 2020 |
| Tømrer Halvor L. Gurholt AS | Construction | 2020 |
| Ulf Solbakken Invest AS | | 2020 |
| Vassfaret Eiendom AS | Wholesale & retail | 2005 |
| Vassfaret Holding AS | Wholesale & retail | 2005 |
| Veterinær Anja a. Steinsholt AS | Professional & scientific | 2023 |
| Vold & Nenset Brug AS | Agriculture & fishing | 1916 |
| Wierød AS | Real estate | 2015 |
| Wiktorsen Invest AS | | 2024 |
| Wrapcity AS | Professional & scientific | 2024 |