| Harestad Elektriske Holding AS | Randaberg | 2016 |
| Harestad Invest AS | Rennesøy | 2005 |
| Harestad Maskin AS | Mosterøy | 1998 |
| Harestua Bygg AS | Harestua | 2019 |
| Harkand Iss | Gb - Ab11 5Bs Aberdeen | 2014 |
| Harkestad Entreprenør AS | Tjeldstø | 2008 |
| Harlem Bygg AS | Tiller | 2020 |
| Harlem Rør AS | Borgenhaugen | 2025 |
| Harmet Modular Building | 76614 Harjumaa | 2018 |
| Harmet Oü Nuf | Ee-76505 Saue | 2009 |
| Harmony Bad AS | Drammen | 2024 |
| Haro Eiendom AS | Råkvåg | 2005 |
| Harpefoss Bygg AS | Vinstra | 2016 |
| Harper Bygg AS | Haslum | 2011 |
| Harry Aarli AS | Tveit | 2019 |
| Harry Martinsen AS | Oslo | 1960 |
| Harrysson Entreprenad AB | Se-694 31 Hallsberg | 2024 |
| Harstad Drift & Servicepartner AS | Harstad | 2013 |
| Harstad Elektro AS | Harstad | 1988 |
| Harstad Elektro Holding AS | Harstad | 2002 |
| Harstad Maskin AS | Harstad | 2014 |
| Harstad Maskin Eiendom AS | Harstad | 2015 |
| Harstad Maskin Holding AS | Harstad | 2014 |
| Harstad Rør AS | Harstad | 1995 |
| Harstad Stålmontasje Drift AS | Harstad | 2010 |
| Harstadbygg Entreprenør AS | Harstad | 2006 |
| Harstadhamn Blikkenslagerverksted AS | Harstad | 2012 |
| HARSTADMESTER1 AS | Harstad | 2019 |
| HARSTADTEKKER1 AS | Harstad | 2021 |
| Harsvik Maskin AS | Revsnes | 2018 |
| Hartleb AS | Nesna | 2019 |
| Hartleb Snekkerservice AS | Nesna | 2023 |
| Hartnet AS | Oslo | 2018 |
| Hartvedt Anleggservice AS | Frekhaug | 2025 |
| Hartz Entreprenør AS | Vikersund | 2004 |
| Haru Bygg AS | Sagstua | 2022 |
| Haru Elektro AS | Larvik | 2022 |
| Harveland AS | Klepp Stasjon | 1987 |
| Harveland Asfaltering AS | Klepp Stasjon | 2006 |
| Harveland Maskin AS | Klepp Stasjon | 2018 |
| Harviken Bygg AS | Elverum | 2021 |
| Harviken Maskin AS | Hernes | 2024 |
| Has Byggservice | Horten | 1997 |
| Has Holding AS | Melhus | 2017 |
| Has Holding II AS | Melhus | 2021 |
| Hasa AS | Ål | 1990 |
| Haslestad Maskin & Eiendom AS | Holmestrand | 2013 |
| Haslestad Maskin AS | Holmestrand | 2023 |
| Haslien Maling Og Tapetsering Ans | Skjeberg | 1995 |
| Haso Holding AS | Kyrksæterøra | 2007 |
| Hass Holding AS | Tromsø | 2021 |
| Hass Invest AS | Fana | 2005 |
| Hasse Nygren | Se-68592 Torsby | 2008 |
| Hasse Pettersen AS | Eidsvoll | 2020 |
| Hasse's Montage AS | Årnes | 2018 |
| Hassel Anlegg AS | Vestfossen | 2019 |
| Hassem AS | Skui | 2020 |
| Hassingen Bygg AS | Fredrikstad | 2020 |
| Hasslund Automasjon AS | Meisingset | 2024 |
| Hast Automasjon AS | Ørskog | 2003 |
| Hath Invest AS | Flekkefjord | 2008 |
| Hatlebrekke Holdingselskap AS | Sande I Sunnfjord | 2022 |
| Hatledal AS | Stryn | 2021 |
| Hatledal Holding AS | Stryn | 2021 |
| Hatlem Bygg AS | Bergen | 2019 |
| Hatlem Holding AS | Bergen | 2019 |
| Hatlen Bygg Service AS | Aurskog | 2024 |
| Hatlevik Rør AS | Fitjar | 1998 |
| Hatlevoll Bygg Og Montering AS | Sogndal | 2007 |
| Hato Holding AS | Skånevik | 2005 |
| Hattarvågen AS | Torvastad | 2010 |
| Hatteland Elektriske AS | Kleppe | 1997 |
| Hatteland Maskinstasjon AS | Bryne | 2015 |
| Hatten Treindustri AS | Oteren | 2026 |
| Hattfjelldal Maskin AS | Hattfjelldal | 2007 |
| Hattrem Maskin AS | Elverum | 2024 |
| Hattvika Brygge AS | Ballstad | 2009 |
| Hau-Co AS | Helgeroa | 2006 |
| Hauan Bygg AS | Kvinesdal | 2019 |
| Hauen Holding AS | Avaldsnes | 2019 |
| Hauer & Kjeve AS | Trøgstad | 2015 |
| Haug & Dagestad Ans | Voss | 1993 |
| Haug Anlegg AS | Rud | 2025 |
| Haug Bygg & Takst AS | Oslo | 2023 |
| Haug Bygg AS | Etne | 2019 |
| Haug Byggteknikk AS | Haugesund | 2017 |
| Haug El Aps | 5000 Odense C | 2014 |
| Haug Entreprenørservice AS | Nesoddtangen | 1990 |
| Haug Maskin AS | Hundvåg | 1983 |
| Haug Miljøpark AS | Ås | 2024 |
| Haug Mur Og Betong AS | Tyristrand | 2023 |
| Haug Og Ruud AS | Lillehammer | 2013 |
| Haug Og Ruud VVS AS | Lillehammer | 2014 |
| Haug Tømrerservice AS | Langhus | 2013 |
| Haug&Lysaker Håndverk AS | Solbergelva | 2023 |
| Haugaas Bygg AS | Froland | 2013 |
| Haugaland Antenneservice AS | Åkrehamn | 2012 |
| Haugaland Asfalt AS | Kopervik | 2019 |
| Haugaland Bygg & Industri AS | Åkrehamn | 2023 |
| Haugaland Bygg & Malerservice AS | Haugesund | 2024 |