| Haig Hodling AS | Information & communication | 2018 |
| Haksol Holding AS | Financial services | 2017 |
| Halil Serdar Sunay AS | Construction | 2019 |
| Hallbjønn AS | Real estate | 2007 |
| Hallingstad Capital Holding AS | Real estate | 2022 |
| Halls Holding AS | | 2020 |
| Hallvardsson AS | Wholesale & retail | 2024 |
| Halvarpåsen AS | Real estate | 2020 |
| Halvorsen Eiendom AS | Real estate | 1998 |
| Hamani Holding AS | | 2018 |
| Hamsdokka Invest AS | Real estate | 1997 |
| Handelskompaniet AS | Wholesale & retail | 1920 |
| Handelskompaniet AS | Wholesale & retail | 1989 |
| Handelstorget Tannlegesenter Da | Health & social care | 2005 |
| Handicraft Plant, Sheet- Metal and Roofwork Serwice M. Niemczyk | Construction | 2004 |
| Handlekraft Holding AS | Real estate | 2005 |
| Hanes AS | Construction | 2018 |
| Hanes Eiendom AS | Real estate | 2018 |
| Hanes Mat AS | Wholesale & retail | 2023 |
| Hanman Holding AS | | 2024 |
| Hanna Kern Dental AS | Health & social care | 2012 |
| Hanne Eikland Holding AS | Wholesale & retail | 2017 |
| Hanne Rosenvold Invest AS | | 2018 |
| Hanne Sørensen AS | Other services | 2025 |
| Hans Houens Gate 2D AS | Real estate | 2024 |
| Hansen & Henriksen Da | Real estate | 2005 |
| Hansen Maskin AS | Construction | 2023 |
| Hansen/Randow Da | Arts & recreation | 2007 |
| Hansh AS | Wholesale & retail | 2018 |
| Happy Girl and Awesome Man AS | Wholesale & retail | 2014 |
| Happy Time Skien AS | Hospitality | 2025 |
| Harald Meier Nilsen AS | Financial services | 2005 |
| Haraldseth Holding AS | | 2023 |
| Hardline AS | Wholesale & retail | 2026 |
| Harlun Holding AS | Professional & scientific | 2021 |
| Harmonisk Business AS | Professional & scientific | 2025 |
| Hartvig Larsen Holding AS | Real estate | 2019 |
| Haska Eiendom AS | Real estate | 2018 |
| Hasseldesign Da | Information & communication | 2002 |
| Hattavarre Holding AS | Health & social care | 2017 |
| Haugen & Grubbe Da | Transport & logistics | 1997 |
| Haugen & Svendsen Invest AS | Construction | 2003 |
| Haugen AS | Professional & scientific | 1990 |
| Haugerød & Nilsen AS | Financial services | 2018 |
| Hauk AS | Real estate | 2025 |
| Hauk Bygg AS | Real estate | 2012 |
| Hauk Holding AS | Real estate | 2005 |
| Hauk Motors AS | Wholesale & retail | 2005 |
| Hauk Sveinsson AS | Construction | 1996 |
| Hauk Sveinsson Gruppen AS | Construction | 2020 |
| Hauk Sveinsson Utvikling AS | Real estate | 2020 |
| Haukstad AS | Real estate | 2024 |
| Haukvik AS | Real estate | 1968 |
| Haust Consulting Da | Professional & scientific | 2017 |
| Hava Skien AS | Hospitality | 2013 |
| Havgul Clean Energy AS | Professional & scientific | 2007 |
| Havnevegen 42 AS | Real estate | 2023 |
| Hax Holding AS | | 2005 |
| HBG 7 AS | Real estate | 1998 |
| Hbgt AS | Real estate | 2016 |
| HC Skien AS | Other services | 2024 |
| He-Kjelleveien AS | Real estate | 2005 |
| Hece Holding AS | | 2023 |
| Hefa Holding AS | Wholesale & retail | 2005 |
| Hegna AS | Professional & scientific | 2005 |
| Heha Invest AS | Real estate | 2021 |
| Heia! AS | Arts & recreation | 1996 |
| Heibø Holding AS | | 2025 |
| Heiden Invest AS | Financial services | 2005 |
| Heidenreich-Riis Og Lillefjære AS | Real estate | 2011 |
| Heidi Og Eigil Johannessen Ans | Administrative & support | 1999 |
| Heimberg Holding AS | Real estate | 2017 |
| Heimberg Invest AS | Real estate | 2023 |
| Heimdall Eiendom AS | Real estate | 2019 |
| Heimon Holding AS | | 2023 |
| Hein Bæra Eiendom AS | Real estate | 2012 |
| Heistad Eiendom AS | Real estate | 2005 |
| Heistad Utvikling AS | Real estate | 2019 |
| Heistaddalen Boligutvikling AS | Real estate | 2021 |
| Heivannet Utvikling AS | Real estate | 2020 |
| Hel Heim Arkitektur AS | Professional & scientific | 2019 |
| Helas Holding AS | | 2023 |
| Helberg Bygg Og Maling AS | Construction | 2011 |
| Helders Eiendom Ans | Real estate | 2008 |
| Helders Malerforretning AS | Construction | 2014 |
| Helge Aasen AS | Construction | 2015 |
| Helgerud Holding AS | Real estate | 2007 |
| Helhjerta AS | Other services | 2020 |
| Helland Musikksenter AS | Wholesale & retail | 1993 |
| Hellstrøm Multimedia AS | Financial services | 2013 |
| Hellums Holding AS | | 2026 |
| Helse Og Beauty Skien Da | Wholesale & retail | 2007 |
| Helt AS | Health & social care | 2013 |
| Helt Elektrisk AS | Real estate | 2021 |
| Helt Ok Holding AS | | 2023 |
| Heltefabrikken AS | Arts & recreation | 1996 |
| Hen Invest AS | Professional & scientific | 2017 |
| Henab Holding AS | Wholesale & retail | 2005 |
| Henast Eiendom AS | Real estate | 2024 |
| Henning Borge AS | Real estate | 2018 |