| Håvard Engebretsen Holding AS | Moelv | 2024 |
| Håvard Rognerud AS | Asker | 2006 |
| Håvard Østerås AS | Trondheim | 2008 |
| Hægland Helseinvest AS | Nesttun | 2021 |
| Høeg Urologi AS | Oslo | 1999 |
| Høgenipa AS | Oslo | 2005 |
| Høgquist AS | Frekhaug | 2015 |
| Høigaard AS | Vestby | 2002 |
| Høivik Invest AS | Skammestein | 2021 |
| Højs Fysioterapi Og Ultralyddiagnostikk AS | Løten | 2019 |
| Høllen Tre AS | Søgne | 2007 |
| Hønefoss Hudlegekontor AS | Hønefoss | 2019 |
| Hønefoss Øyelegesenter AS | Hønefoss | 2005 |
| Hørsel Og Tinnitusklinikken AS | Oslo | 2023 |
| Hørsel-Senteret AS | Elverum | 2002 |
| Hørselsklinikken Namdal AS | Namsos | 2012 |
| Hørselsrehabilitering AS | Oslo | 2012 |
| Hørselssenteret AS | Levanger | 2015 |
| Høst AS | Straumsbukta | 1990 |
| Høst Helse AS | Arendal | 2019 |
| Høst Helse Åmli AS | Åmli | 2021 |
| Høvdinggården Legekontor AS | Steinkjer | 2010 |
| Høvik Bo Og Aktivitetssenter AS | Høvik | 2013 |
| Høvik Fysioterapi AS | Høvik | 2016 |
| Høvik Legesenter Da | Høvik | 2004 |
| Høvik Psykisk Helse AS | Høvik | 2022 |
| Høvik Tannlegesenter AS | Høvik | 2026 |
| Høyangs-Håland Gard AS | Høyanger | 2019 |
| Høybråten Fysikalske Institutt AS | Oslo | 2004 |
| Høybråten Legekontor Da | Oslo | 2015 |
| Høybråten Tannklinikk AS | Oslo | 2012 |
| Høyden Osteopatiklinikk AS | Sarpsborg | 2017 |
| Høyenhall Helse Og Rehabilitering AS | Røyse | 2013 |
| Høyer Investering AS | Stavanger | 2005 |
| Høyland-Lund Fysioterapi AS | Lyngdal | 2013 |
| I All Enkelhet Formidling AS | Moss | 2018 |
| I Bedrift AS | Asker | 2019 |
| I Belive 24/7 AS | Kolbu | 2023 |
| I Berteig AS | Oslo | 2023 |
| I Care AS | Haslum | 2014 |
| I Gode Hender Tannklinikk AS | Oslo | 2025 |
| I Presens AS | Borgen | 2014 |
| I. L. Hvalby Holding AS | Gjøvik | 2021 |
| I.Am.Mona AS | Stavanger | 2026 |
| Iaap AS | Lier | 2013 |
| Iak AS | Kristiansand S | 2023 |
| Ibalanse Naturmedisinske AS | Nøtterøy | 2020 |
| Ibanez Holding AS | Kristiansand S | 2009 |
| Ibe Holding AS | Trondheim | 2015 |
| Ibedring AS | Bodø | 2006 |
| Ibsen Iris AS | Gjøvik | 2025 |
| Ibsen Tannlegesenter AS | Skien | 2014 |
| Ibsensykehusene AS | Jessheim | 1998 |
| Icon Skin Clinic AS | Rådal | 2022 |
| ICU2 Nuf | Kongsberg | 2011 |
| Ida Aasen Konsulenttjenester AS | Hurdal | 2025 |
| Ida Koll-Frafjord AS | Randaberg | 2016 |
| Ida Mossin Olesen AS | Oslo | 2024 |
| Idd Holding AS | Hommelvik | 2025 |
| Ide Hus AS | Nærbø | 1990 |
| Ide Maling Og Arbeidssenter Da | Skien | 1997 |
| Idea Kompetanse Arbeid Og Inkludering AS | Notodden | 2020 |
| Idea Kompetanse AS | Notodden | 1991 |
| Idea Kompetanse Jobb Og Utvikling AS | Notodden | 2020 |
| Idea Mekanisk AS | Notodden | 2020 |
| Ideanova AS | Stavanger | 2013 |
| Ideell Omsorg AS | Skogbygda | 2018 |
| Ideelle Tiltak AS | Rømskog | 2022 |
| Iden Medical AS | Bergen | 2023 |
| Iden Medical Holding AS | Bergen | 2023 |
| Idlandia AS | Oslo | 2022 |
| Idrettens Helsesenter AS | Oslo | 2009 |
| Idretts- Og Helseklinikken AS | Nesttun | 2020 |
| Idungården Fotklinikk AS | Trondheim | 2013 |
| Idungården Legesenter Da | Trondheim | 2001 |
| Ieva AS | Oslo | 2025 |
| Ifjobb AS | Leksvik | 1987 |
| Ifjobb Holding AS | Rissa | 2024 |
| Iflyt AS | Lillesand | 2026 |
| Ifocus Øyeklinikk Arendal AS | Arendal | 2023 |
| Ifocus Øyeklinikk Haugesund AS | Haugesund | 2012 |
| Ifocus Øyeklinikk Stavanger AS | Stavanger | 2020 |
| Ifokus AS | Larvik | 2016 |
| Ihlhaug Holding AS | Horten | 2023 |
| Ihud AS | Sandefjord | 2018 |
| Ihys AS | Bergen | 2024 |
| Ijj Tjenester Ans | Rasta | 2006 |
| Iklinikk AS | Oslo | 2020 |
| Ikya Clinic AS | Oslo | 2016 |
| Il Veiledning Og Terapi AS | Hell | 2022 |
| Ila Legesenter Da | Trondheim | 2013 |
| Ila Legetjenester AS | Trondheim | 2022 |
| Ileana AS | Bergen | 2026 |
| Ilegene Da | Rælingen | 2023 |
| Ilevollen Fysioterapi Og Trening AS | Trondheim | 2019 |
| Ilåven AS | Skollenborg | 2018 |
| Imaginary Imaging AB | Se-216 13 Limhamn | 2024 |
| Imagine Birthworks AS | Nesoddtangen | 2018 |
| Ime Verksted AS | Mandal | 1990 |
| Imed AS | Skien | 2013 |