| Haiko AS | Årnes | 2025 |
| Hajala AS | Gjøvik | 2024 |
| Hajonor AS | Lesja | 2015 |
| Hak Holding AS | Drammen | 2010 |
| Hak Invest AS | Paradis | 2008 |
| Hakadal Regnskapsbyrå AS | Oslo | 2022 |
| Hakarl AS | Stavanger | 2016 |
| Hakestad Holding AS | Oslo | 2021 |
| Haki AS | Bryne | 1996 |
| Hakketi AS | Oslo | 1986 |
| Hakon Lærum Consulting AS | Lier | 2014 |
| Hakø Invest AS | Oslo | 2014 |
| Hal Arkitekter AS | Oslo | 2007 |
| Halal Certification Services Nordic AS | Algarheim | 2026 |
| Halbjørhus AS | Hemsedal | 2002 |
| Halbjørhus Elektro Og Takst AS | Hemsedal | 2024 |
| Halda AS | Oslo | 2023 |
| Halda Invest AS | Oslo | 2021 |
| Haldane Oilfield Services Ltd | Edinburgh Ef10 4Fd Scotland | 2018 |
| Haldde Arkitekter AS | Alta | 2010 |
| Halden Arkitektkontor AS | Halden | 1996 |
| Halden Byutvikling AS | Halden | 1999 |
| Halden Kjernekraft AS | Halden | 2023 |
| Halden Regnskap AS | Halden | 2018 |
| Halden Reklame Og Profilering AS | Halden | 2024 |
| Halden Revisjonsbyrå AS | Halden | 2008 |
| Halfdan Nitter AS | Nesbru | 2006 |
| Halfrid Gruppen AS | Oslo | 2019 |
| Halfspring AS | Oslo | 2018 |
| Halfwave (UK) Ltd | Portland Dt5 1Dx | 2017 |
| Halger Fjellvik Regnskapskontor AS | Steinkjer | 1993 |
| Halhjem Invest AS | Os | 2008 |
| Halia Ocean Services Ltd | Ie-Sligo F26 Hx23 | 2023 |
| Halibut Arctic Capital AS | Tromsø | 2020 |
| Halinor AS | Vanse | 2025 |
| Halk AS | Oslo | 2020 |
| Hall Invest II AS | Torvastad | 2011 |
| Hall Strandli Ans | Torød | 2009 |
| Halland Design AS | Oslo | 2022 |
| Halland Gruppen AS | Oslo | 2023 |
| Hallandvik Prosjekt AS | Søgne | 2007 |
| Hallao AS | Risør | 2026 |
| Hallar AS | Oslo | 1981 |
| Hallaråker Invest AS | Mosterhamn | 2014 |
| Hallarøy AS | Smøla | 2002 |
| Hallberg Og Mull AS | Nesttun | 2024 |
| Halle & Halle AS | Oslo | 2005 |
| Halleland AS | Sveio | 2023 |
| Halleland Geoconsulting AS | Vestre Åmøy | 2024 |
| Halleland Holding AS | Sveio | 2011 |
| Hallenbau GBR | 17094 Colpin | 2010 |
| Hallerud Consulting AS | Oslo | 2024 |
| Hallerud Investment AS | Oslo | 2024 |
| Hallgeir Haugland Holding AS | Os | 2026 |
| Hallgren & Hallgren AS | Oslo | 1992 |
| Hallgren Finansforvaltning Haff AS | Oslo | 1961 |
| Hallgren Kostveit AS | Rolvsøy | 2012 |
| Halliburton BV | Stavanger | 1998 |
| Halliburton Denmark | 6715 Esbjerg | 1998 |
| Halliburton Energy Services Inc | Stavanger | 2010 |
| Halliburton Group Canada Inc | Stavanger | 2010 |
| Halliburton Manufacturing and Services Ltd | Stavanger | 1995 |
| Halling Vakt AS | Gol | 2016 |
| Hallingcast AS | Torpo | 2023 |
| Hallingdal Bedriftsrådgivning AS | Geilo | 2006 |
| Hallingdal Konstruksjoner AS | Torpo | 2024 |
| Hallingdal Næringshage AS | Torpo | 1991 |
| Hallingdal Reklame AS | Hemsedal | 2014 |
| Hallingdal Revisjonsselskap AS | Geilo | 1999 |
| Hallingdal Økonomiservice AS | Gol | 1998 |
| Hallingfrakt AS | Kongsberg | 2013 |
| Hallingkonsult AS | Flå | 1990 |
| Hallinglos AS | Hemsedal | 2012 |
| Hallingstad Hesteklinikk AS | Borre | 2018 |
| Hallingtech AS | Nesbyen | 2021 |
| Hallo Consulting AS | Hvalstad | 2025 |
| Hallstein AS | Oslo | 2016 |
| Halltech AS | Lysaker | 2023 |
| Halluca AS | Kvaløysletta | 2009 |
| Hallvard Nordskog AS | Flatdal | 1998 |
| Hallén Holding AS | Oslo | 2012 |
| Halo Consult AS | Fredrikstad | 2022 |
| Halo Invest AS | Oslo | 2005 |
| Halo Solar Holding AS | Oslo | 2016 |
| Halo Vind Da | Hamar | 2025 |
| HALO1 AS | Andebu | 2017 |
| Halodyne AS | Oslo | 2025 |
| Haloludvigsen AS | Oslo | 2015 |
| Halsco AS | Bodø | 2021 |
| Halsco Bidco 2024-1 AS | Bodø | 2021 |
| Halse Holding AS | Kristiansand S | 2008 |
| Halsen AS | Oslo | 2023 |
| Halsne Consulting AS | Ræge | 2010 |
| Halsnøy Kontroll Limited Nuf | Herøysundet | 2009 |
| Halsnøy Rekneskapskontor AS | Sæbøvik | 2005 |
| Halsteinrud Rådgivning Ans | Hønefoss | 2009 |
| Halsteinslid AS | Stryn | 2020 |
| Halstensen Consult & Trading AS | Vettre | 2024 |
| Halstensen Management AS | Bekkjarvik | 2015 |
| Haltek Holding AS | Sola | 2017 |