| Halsa Maskindrift AS | Halsa | 2025 |
| Halse Cavator AS | Svelgen | 2018 |
| Halset Entreprenørservice AS | Vik I Sogn | 2009 |
| Halsne & Bårdsen AS | Veavågen | 2016 |
| Halsnøy Hus Og Hage AS | Høylandsbygd | 2019 |
| Halsteinsentomta AS | Bud | 2021 |
| Halti Rør AS | Storslett | 2022 |
| Halton Foodservice GmbH | Oslo | 2011 |
| Haltuff Elektro AS | Oslo | 2013 |
| Halum Entreprenør AS | Andebu | 1994 |
| Halvar Skodje AS | Skodje | 2023 |
| Halvard Viken Foss Bygg AS | Sande I Sunnfjord | 2013 |
| Halvdan Salomonsen Anlegg AS | Åros | 1998 |
| Halvor Traktor Salg AS | Vinje | 2021 |
| Halvorsen & Jensvang Holding AS | Skedsmokorset | 2005 |
| Halvorsen Anlegg AS | Levanger | 2024 |
| Halvorsen Bygg AS | Bodø | 2018 |
| Halvorsen Bygg Og Eiendomsforvaltning AS | Andebu | 2025 |
| Halvorsen El & Eiendom AS | Holmestrand | 2017 |
| Halvorsen Elektriske AS | Åmli | 2006 |
| Halvorsen Entreprenør AS | Vestfossen | 2022 |
| Halvorsen Glass Og Service AS | Åmot | 2018 |
| Halvorsen Investering AS | Sandnes | 2005 |
| Halvorsen Maskin AS | Tomasjord | 2015 |
| Halvorsen Rør AS | Flekkefjord | 1995 |
| Halvorsen Rørservice AS | Kapp | 2020 |
| Halvorsens Bygg AS | Saltrød | 2015 |
| Halvorsens Drift & Bygg Vedlikehold AS | Ski | 2012 |
| Halvorsens Sprengningsservice Da | Fagerstrand | 2009 |
| Halvorsli Fjell Og Grunn AS | Porsgrunn | 1983 |
| Hama Nordic AS | Gardermoen | 2025 |
| Hama Rørleggerservice AS | Fredrikstad | 2019 |
| Hamajo Holding AS | Trøgstad | 2025 |
| Hamar & Vikeså Bygg AS | Moi | 2000 |
| Hamar Boligbygg AS | Hamar | 2014 |
| Hamar Brydderi AS | Hamar | 2023 |
| Hamar Bygg & Graving AS | Hamar | 2022 |
| Hamar Bygg & Renhold AS | Furnes | 2012 |
| Hamar Bygg AS | Hamar | 2008 |
| Hamar Byggmaster AS | Hamar | 2014 |
| Hamar Elektro AS | Ingeberg | 2013 |
| Hamar Glass AS | Hamar | 1982 |
| Hamar Graveservice AS | Ottestad | 2012 |
| Hamar Graveservice Og Transport AS | Ottestad | 2025 |
| Hamar Kulde- Og Klimateknikk AS | Hamar | 2024 |
| Hamar Maling Og Vedlikehold Da | Hamar | 2003 |
| Hamar Montering AS | Ottestad | 2017 |
| Hamar Rørleggerbedrift AS | Hamar | 2017 |
| Hamar Utleieboliger AS | Hamar | 1995 |
| Hamar Varmepumpeservice AS | Hamar | 2023 |
| Hamarøy Multiservice AS | Skutvik | 2023 |
| Hamborg's Snekkeri AS | Tønsberg | 2012 |
| Hambro Bygg AS | Røn | 2007 |
| Hamco Eiendom AS | Rossfjordstraumen | 2019 |
| Hamco Holding AS | Rossfjordstraumen | 2019 |
| Hamer Jaroslaw Jaloszynski | 87-800 Wloclawek | 2015 |
| Hamilton Germany GmbH Nuf | De-82166 Gräfelfing | 2026 |
| Hamlagrø Hytteservice AS | Voss | 1999 |
| Hammari AS | Alta | 2020 |
| Hammarö Stenforum AB Nuf | Se-663 41 Hammarö | 2011 |
| Hammer & Eliassen VVS AS | Stavanger | 2007 |
| Hammer Blikk AS | Mo I Rana | 2023 |
| Hammer Building & Trading AS | Tananger | 2018 |
| Hammer Bygg & Graveservice AS | Oslo | 2017 |
| Hammer Byggservice AS | Nybergsund | 2015 |
| Hammer Kraft AS | Stord | 2017 |
| Hammer Moen Holding AS | Innvik | 2017 |
| Hammer Og Rødland AS | Mandal | 2008 |
| Hammer Og Sag AS | Hvalstad | 2007 |
| Hammer Prosjekt AS | Langevåg | 2022 |
| Hammer- & Spikergutta AS | Bryne | 2011 |
| Hammer-Snekkerservice AS | Ås | 2023 |
| HAMMER1 AS | Vormsund | 2012 |
| Hammerbygg AS | Heggedal | 2020 |
| Hammerfall Invest AS | Sandnessjøen | 2010 |
| Hammerfest Bygg AS | Hammerfest | 2008 |
| Hammerfest Glasservice AS | Rypefjord | 2022 |
| Hammerfest Grave Og Brøyte Service AS | Hammerfest | 2021 |
| Hammerfjell AS | Trondheim | 2022 |
| Hammerfjell Elektro AS | Trondheim | 2022 |
| Hammerglass AS | Oslo | 2018 |
| Hammeriet AS | Fetsund | 2023 |
| Hammerkraft AS | Stord | 2024 |
| Hammerkraft Bygg AS | Stord | 2026 |
| Hammeron AS | Bodø | 2022 |
| Hammers Gate 38 AS | Egersund | 2013 |
| Hammersbøen Bygg AS | Vallavik | 2025 |
| Hammersbøen Elektro AS | Geilo | 2021 |
| Hammersbøen Holding AS | Geilo | 2022 |
| Hammersland AS | Øvre Ervik | 2018 |
| Hammersland Bygg AS | Øvre Ervik | 2026 |
| Hammersland Og Milde Murmesterforretning AS | Mathopen | 2014 |
| Hammerstad Bygg AS | Raufoss | 2025 |
| Hammerstad Eiendom AS | Oslo | 2017 |
| Hammerstad Maskin AS | Fredrikstad | 1998 |
| Hammertek AS | Bjugn | 2015 |
| Hammertime Bygg AS | Oslo | 2013 |
| Hammerø Bygg AS | Molde | 2005 |
| Hamming Elektro AS | Vikersund | 2001 |
| Hammond Design AS | Oslo | 2016 |