| Groven Og Karlsen AS | Construction | 2005 |
| Gründersen AS | Professional & scientific | 2012 |
| Gullbring Kulturanlegg AS | Arts & recreation | 1991 |
| Gullbring Trening AS | Arts & recreation | 2021 |
| Gullbringvegen 10 AS | Real estate | 2022 |
| Gullfisken Bø AS | Wholesale & retail | 2009 |
| Gunnar Bergskås Holding AS | Financial services | 2005 |
| Gunnar Kleppen AS | Financial services | 2005 |
| Gvarv Blomster AS | Administrative & support | 2023 |
| H. Strand Holding AS | Real estate | 2005 |
| Haugane Stasjonsdrift AS | Wholesale & retail | 2019 |
| Haugans Bil AS | Other services | 1993 |
| Haugen & Sønn AS | Wholesale & retail | 2016 |
| Haugen Og Verpe Utleiebygg Ans | Real estate | 2014 |
| Haugestøl VVS AS | Construction | 1999 |
| Haukeli-Invest AS | Real estate | 2014 |
| Havresekken AS | | 2026 |
| Heggen Service AS | | 2024 |
| Hegna Drift AS | Wholesale & retail | 2016 |
| Hegnaland Da | Hospitality | 1999 |
| Heidi's Hårstudio AS | Other services | 2024 |
| Helge Solberg Holding AS | Hospitality | 2016 |
| Hellebekk Invest AS | | 2025 |
| Hellestad Eiendom AS | Wholesale & retail | 2006 |
| Hellestad Sandtak AS | Manufacturing | 2004 |
| Herremo Pukk Og Grus AS | Mining & quarrying | 2013 |
| Hesthag Holding AS | | 2026 |
| HH Utvikling & Invest AS | | 2025 |
| HNS Consult AS | Information & communication | 2012 |
| Holidays AS | Real estate | 2022 |
| Holtan Klinikken AS | Health & social care | 2009 |
| Holtangården AS | Real estate | 1998 |
| Hovdestad Holding AS | | 2025 |
| HS Solberg Eiendom AS | Real estate | 2016 |
| Humbucker Rockband Da | Arts & recreation | 2018 |
| Husholding AS | Manufacturing | 2005 |
| Husly Kafé & Catering AS | Hospitality | 2016 |
| Hvilen IT Og Tjenester AS | Information & communication | 2026 |
| Hvitås Leiker AS | Wholesale & retail | 2013 |
| Hydrabox AS | Information & communication | 2026 |
| Hyllest AS | Manufacturing | 2017 |
| Hå Maskin AS | Construction | 2012 |
| Høgefjell Invest AS | Real estate | 2017 |
| Høgetveit Invest AS | | 2025 |
| Høgvoll AS | Real estate | 2018 |
| Hørte Eiendom AS | Real estate | 2006 |
| Høyt & Lavt Bø I Telemark AS | Arts & recreation | 2015 |
| IH1212 Invest AS | Real estate | 2005 |
| Imagemen Ans | Manufacturing | 2000 |
| Ingebjørg Almankås AS | Manufacturing | 1990 |
| Ingebjørg Og Per Oskar Strand Ans | Agriculture & fishing | 1982 |
| Innleggen Holding AS | Education | 2017 |
| Investeringer AS | Construction | 2021 |
| Islnd AS | | 2026 |
| Itv Bolig AS | Construction | 2018 |
| Itv Eiendomsutvikling AS | Professional & scientific | 2016 |
| Itv Gruppen AS | Real estate | 2005 |
| Itv Næringseiendom AS | Real estate | 2017 |
| Iyengar Yoga Telemark AS | Education | 2015 |
| Jab Maskin Og Motor AS | Manufacturing | 2020 |
| Jafs Midt Telemark AS | Hospitality | 2023 |
| Jan Espe Holding AS | Real estate | 2020 |
| Jan&Julians AS | Wholesale & retail | 2025 |
| Jo-In Holding AS | | 2021 |
| JTK AS | Construction | 2006 |
| Juntos AS | Construction | 2015 |
| K Eika AS | | 2019 |
| Kaasa & Rønningsland AS | Real estate | 2021 |
| Kaasa Boligtakst AS | Real estate | 2024 |
| Kaasa Invest AS | Construction | 2005 |
| Kaasa Kommunikasjon AS | Professional & scientific | 2024 |
| Kaasa Maskin AS | Construction | 1985 |
| Kasland Trafikkskole AS | Education | 1981 |
| Katamina Holding AS | Professional & scientific | 2017 |
| Kenneth Nilsen Transport AS | Transport & logistics | 2021 |
| KHT Eiendom AS | Real estate | 2021 |
| KHT Holding AS | Other services | 2021 |
| Kilen Eiendom AS | Real estate | 2000 |
| Kinck AS | Wholesale & retail | 2005 |
| Kjuketek AS | Professional & scientific | 2019 |
| KNB AS | Construction | 2007 |
| Knut Skrede AS Ur Og Optikk | Wholesale & retail | 1978 |
| Kodern AS | Information & communication | 2025 |
| Kristoffer Invest AS | Agriculture & fishing | 2020 |
| KRK AS | Real estate | 2005 |
| Kurompa Samdrift Da | Agriculture & fishing | 2008 |
| Langemyr Handel AS | Hospitality | 2023 |
| Langkås Transport AS | Transport & logistics | 1994 |
| LBH 08 Invest AS | | 2025 |
| Legedata Servicepartner AS | Wholesale & retail | 1994 |
| Lepperød Invest AS | Professional & scientific | 1975 |
| Liberty Now AS | Information & communication | 2018 |
| Licas Holding AS | | 2025 |
| Lifjell Eiendom AS | Real estate | 1999 |
| Lifjell Holding AS | Wholesale & retail | 2023 |
| Lifjell Hyttegrend AS | Real estate | 2024 |
| Lifjell Hyttetomter AS | Real estate | 2006 |
| Lifjell Service AS | Administrative & support | 2004 |
| Lifjell Skisenter AS | Arts & recreation | 1992 |
| Lifjell Utvikling AS | Real estate | 2001 |