| Heimdall's Eiendom AS | Real estate | 2019 |
| Heine Aardalen Holding AS | Real estate | 2014 |
| Heitmann Utvikling AS | Professional & scientific | 2019 |
| Helfred Holding AS | | 2025 |
| Helge & Terjes Gulvlegging Ans | Construction | 2000 |
| Helgesen Engros AS | Wholesale & retail | 2007 |
| Hellstrøm Auto AS | Wholesale & retail | 2014 |
| Hellstrøm Eiendom AS | Real estate | 2016 |
| Helping Hands AS | Real estate | 2021 |
| Helseholding AS | | 2019 |
| Helsenøkkelen AS | Other services | 2024 |
| Henning Simonsen AS | Education | 2018 |
| Henning Søstrand AS | Real estate | 2025 |
| Henriette Slorer Kunstproduksjon AS | Education | 2017 |
| Henrik Akselsen Holding AS | | 2022 |
| Henriksen AS | Real estate | 1947 |
| Herlov Langgård AS | Real estate | 1984 |
| Herregårdsmur AS | Construction | 2009 |
| Hes AS | Professional & scientific | 2017 |
| Hexagon Geosystems Services Norway AS | Professional & scientific | 2020 |
| HF Holding AS | Professional & scientific | 2024 |
| Hf-Entreprenør AS | Construction | 2016 |
| HGR Holding AS | | 2023 |
| Hirsch AS | Information & communication | 2017 |
| HJ Prosjekt AS | | 2024 |
| Hjelle Capital AS | | 2022 |
| Hma Holding AS | Financial services | 2013 |
| HMS Magnus AS | Health & social care | 1998 |
| Hmsundt AS | Health & social care | 2013 |
| Hoff-Hansen Eiendom AS | Real estate | 2018 |
| Hola Holding AS | Professional & scientific | 2024 |
| Holdem AS | Construction | 2005 |
| Holding Priapismus AS | Real estate | 2016 |
| Holdingselskapet Vårt AS | Information & communication | 2021 |
| Holen Bygg Og Vedlikehold AS | Construction | 2020 |
| Holmskau Tre Og Betong AS | Construction | 2024 |
| Holt Obrien AS | Professional & scientific | 2018 |
| Hotel Fredrikstad AS | Hospitality | 2004 |
| Hoti Holding AS | | 2020 |
| Hovedhuset Veum Hageby AS | Real estate | 2021 |
| Hovig & Kvernes Arkitektkontor AS | Professional & scientific | 1972 |
| Hoyer Holding AS | Financial services | 2015 |
| Hoyer Industrier AS | Wholesale & retail | 1995 |
| HSL Investeringsselskap AS | | 2024 |
| Hubzero AS | Information & communication | 2024 |
| Hudlege Hans Petter Valnes Jørgensen AS | Health & social care | 1996 |
| Hulaas Invest AS | | 2018 |
| Husaria Trader AS | Wholesale & retail | 2019 |
| Huseby Sag AS | Real estate | 2014 |
| Huthsgate 5 AS | Real estate | 2021 |
| Hvíla AS | Education | 2024 |
| Hydrolift AS | Manufacturing | 2002 |
| HYF02 AS | Professional & scientific | 2025 |
| HYF03 AS | | 2025 |
| HYF05 AS | Professional & scientific | 2025 |
| HYF07 AS | Professional & scientific | 2025 |
| HYF10 AS | Professional & scientific | 2025 |
| Hyldmo Bygg AS | Construction | 2025 |
| Hyldmo Invest AS | Information & communication | 2019 |
| Hyllemester AS | Professional & scientific | 2022 |
| Håndverksmur AS | Professional & scientific | 2005 |
| Håpets Katedral AS | Administrative & support | 2018 |
| Høiax AS | Manufacturing | 1984 |
| Høidahl Happy Holding AS | Wholesale & retail | 2022 |
| Høidahls AS | | 2025 |
| Høkern AS | Arts & recreation | 2022 |
| Høyer Fredrikstad Sentrum AS | Wholesale & retail | 2019 |
| Høyfjell Charolais AS | Wholesale & retail | 2008 |
| Høytrykk Compagniet AS | Construction | 2019 |
| Høyum Invest AS | | 2019 |
| Høyum Qualitas AS | Real estate | 2009 |
| Idm Norgeinvest AS | | 2026 |
| Idyll Festivalen AS | Arts & recreation | 2015 |
| If Bygg AS | Construction | 2019 |
| Ilaveien 97 AS | Real estate | 1970 |
| Ilebys Blomster AS | Wholesale & retail | 1988 |
| Ilebys Gartneri AS | Agriculture & fishing | 1982 |
| Iljos AS | Wholesale & retail | 2026 |
| Illebra-Catering AS | Hospitality | 2019 |
| Imc Holding AS | Real estate | 2013 |
| Importpris.No AS | Wholesale & retail | 2024 |
| Impro AS | Wholesale & retail | 1995 |
| Inbalance AS | Education | 2018 |
| Inbeauty AS | Wholesale & retail | 2021 |
| Industri-Hydraulikk AS | Wholesale & retail | 2016 |
| Industriveien 3 Eiendom AS | Wholesale & retail | 2008 |
| Industriveien 5-11 AS | Real estate | 1992 |
| Infigent AS | Real estate | 2012 |
| Info-Media AS | Professional & scientific | 1998 |
| Ing. Hansen AS | Professional & scientific | 2025 |
| Ingeniør Håvard Hansen AS | Professional & scientific | 2014 |
| Inger-Anne-Kultur AS | Professional & scientific | 2021 |
| Ingulstad Feltet Nord AS | Real estate | 2019 |
| Inip AS | | 2019 |
| Initas AS | Real estate | 1985 |
| Inkludering Og Mestring AS | Health & social care | 2025 |
| Innoarte AS | Information & communication | 1985 |
| Innofiber AS | Manufacturing | 2021 |
| Innofiber Holding AS | Manufacturing | 2022 |
| Installatøren Holding AS | | 2013 |