| Heggland Holding AS | Construction | 2011 |
| Heggland Utvikling AS | Real estate | 2010 |
| Heimdal Chokolade AS | Manufacturing | 2022 |
| Helge Gustafson Transport AS | Transport & logistics | 2019 |
| Helle Næringsområde AS | Real estate | 2021 |
| Hellevik Invest AS | Financial services | 2015 |
| Helsekilden Fysioterapi AS | Health & social care | 2021 |
| Helseterapi AS | Wholesale & retail | 2006 |
| Helt Topp Bilvask & Bilpleie Da | Other services | 2010 |
| Henriksen Snekkeri AS | Manufacturing | 2000 |
| Hernis Scan Systems AS | Manufacturing | 1989 |
| Hetland & Sandås AS | Real estate | 2019 |
| Hetland Agder AS | Construction | 1993 |
| Higo AS | Professional & scientific | 2019 |
| Hilmar Holding AS | Real estate | 2012 |
| Hje Consulting AS | Professional & scientific | 2014 |
| Hjelbo Utleie Da | Hospitality | 2007 |
| Hjemmeoptikk.No AS | Health & social care | 2019 |
| Hjulius Arendal AS | Wholesale & retail | 2006 |
| Hla AS | Education | 2026 |
| HMS Hjelp AS | Wholesale & retail | 2019 |
| Hoa-Hong Sushi AS | Hospitality | 2023 |
| Hobby AS | Wholesale & retail | 1977 |
| Hoel VVS & Interiør AS | Construction | 2009 |
| Hoel VVS Holding AS | Real estate | 2015 |
| Holding Stilrent AS | | 2026 |
| Holvik Bowling AS | Real estate | 2007 |
| Hommelsgård AS | Professional & scientific | 2010 |
| Hong Kong Restaurant AS | Hospitality | 1996 |
| Horisontal Media AS | Information & communication | 2017 |
| Hovland Offshore Consult AS | Professional & scientific | 2023 |
| HR Auto AS | Wholesale & retail | 2023 |
| Hrvc Eiendom AS | Real estate | 2011 |
| Hrvc Snekker Og Håndverkstjenester AS | Construction | 2012 |
| HSH Entreprenør Arendal AS | Construction | 2019 |
| HTH Arendal AS | Wholesale & retail | 2023 |
| Hudlege Frode Kristiansen AS | Health & social care | 2013 |
| Hudpro by Selinas AS | Other services | 2018 |
| Hundehuset AS | Real estate | 1991 |
| Hundehuset Holding AS | | 2015 |
| Hybrid Holding AS | Professional & scientific | 1982 |
| Hydron AS | Construction | 2025 |
| Håkman AS | Health & social care | 2022 |
| Hårcompagniet Hairspa AS | Other services | 2019 |
| Hårkollektivet AS | Other services | 2020 |
| Hårkollektivet Kristiansand AS | Other services | 2020 |
| Hårmakeren AS | Wholesale & retail | 2020 |
| Høgseth Maskin & Utleie AS | Administrative & support | 2022 |
| Høst Helse AS | Health & social care | 2019 |
| Høyer Invest 2 AS | Wholesale & retail | 2022 |
| Høyergården AS | Real estate | 1966 |
| Høyåshei AS | Real estate | 2024 |
| Icecap Infosec AS | Information & communication | 2023 |
| Idea Group AS | Arts & recreation | 2014 |
| Ifocus Øyeklinikk Arendal AS | Health & social care | 2023 |
| Ildstedet Agder AS | Wholesale & retail | 2019 |
| Impact AI AS | Administrative & support | 2015 |
| Impact Hub Agder AS | Administrative & support | 2017 |
| Inbox Minilager AS | Real estate | 2022 |
| Indre Poll Eiendom AS | Real estate | 2024 |
| Industrisøm AS | Manufacturing | 1986 |
| Industritoppen 20 a AS | Real estate | 2020 |
| Industritoppen 22 AS | Real estate | 2009 |
| Industritoppen 32 AS | Real estate | 2024 |
| Industritoppen 5 Eiendom AS | Real estate | 2025 |
| Industriveien 8 AS | Real estate | 1993 |
| Industriveien 9 Grimstad AS | Real estate | 2013 |
| Ing. Trygve Jensen AS | Construction | 2011 |
| Inhouse Invest AS | Information & communication | 2014 |
| Inklusiv Agder AS | Professional & scientific | 2023 |
| Inkubator AS | Administrative & support | 2006 |
| Inkubator Resources AS | Hospitality | 2018 |
| Innoventi AS | Professional & scientific | 1997 |
| Innro AS | Health & social care | 2026 |
| Inon AS | Wholesale & retail | 2007 |
| Insideout AS | | 2014 |
| Integria AS | Education | 2025 |
| Invest Sør-Vest AS | Wholesale & retail | 2003 |
| Iphonemannen AS | Other services | 2018 |
| Irdesign AS | Manufacturing | 2012 |
| Isac Holding AS | Professional & scientific | 2014 |
| Isbar Jørgensen AS | Hospitality | 2025 |
| Isens AS | Manufacturing | 2015 |
| Italiakb AS | Wholesale & retail | 2021 |
| Itworks AS | Information & communication | 2017 |
| Ivre AS | Arts & recreation | 1983 |
| Ivre Sport Og Anlegg AS | Construction | 1999 |
| J E Pedersen & Co AS | Real estate | 1932 |
| J Knudsen & Co AS | Real estate | 1914 |
| J.I. Birkeland Holding AS | Real estate | 2005 |
| J.O. Holding AS | Real estate | 2017 |
| Ja Partners AS | Professional & scientific | 2019 |
| Jack Eiendom AS | Real estate | 1998 |
| Jackvi AS | Construction | 2021 |
| Jagro Invest AS | Real estate | 2017 |
| Jagro Ormetjern AS | Real estate | 2013 |
| Jagro Stoa AS | Real estate | 2013 |
| Jagro Stoaveien 16 AS | Real estate | 2017 |
| Jahre AS | | 2022 |
| Jakt & Friluft AS | Wholesale & retail | 2000 |