| Grimstad Glass AS | Construction | 2002 |
| Grimstad Hagesenter AS | Wholesale & retail | 2021 |
| Grimstad Hogst & Ved AS | Agriculture & fishing | 2011 |
| Grimstad Hostel AS | Real estate | 2016 |
| Grimstad Hudpleie Og Aromaterapi AS | Other services | 2012 |
| Grimstad Håndverksenter AS | Wholesale & retail | 2003 |
| Grimstad International School AS | Education | 2024 |
| Grimstad Invest AS | Real estate | 2007 |
| Grimstad Kattepensjonat AS | Agriculture & fishing | 2025 |
| Grimstad Kiosk AS | Hospitality | 2024 |
| Grimstad Kjøleservice AS | Real estate | 2010 |
| Grimstad Klinikken AS | Health & social care | 1990 |
| Grimstad Klokker Og Smykker AS | Wholesale & retail | 2025 |
| Grimstad Konsulentene AS | Administrative & support | 2025 |
| Grimstad Lagerhotel AS | Manufacturing | 2018 |
| Grimstad Legekontor AS | Health & social care | 2005 |
| Grimstad Legesenter AS | Health & social care | 2021 |
| Grimstad Lydservice Da | Administrative & support | 2003 |
| Grimstad Massasje Og Trines Bunadsøm AS | Other services | 2015 |
| Grimstad Min by AS | Professional & scientific | 1999 |
| Grimstad Pizza AS | Hospitality | 2020 |
| Grimstad Planteskole AS | Agriculture & fishing | 1990 |
| Grimstad Potetpakkeri, Eiendom Da | Real estate | 2004 |
| Grimstad Regnskap AS | Professional & scientific | 2023 |
| Grimstad Rør AS | Construction | 2006 |
| Grimstad Salg & Service AS | Wholesale & retail | 2025 |
| Grimstad Sand AS | Mining & quarrying | 1988 |
| Grimstad Servicenter AS | Wholesale & retail | 1982 |
| Grimstad Solutions Da | Professional & scientific | 2025 |
| Grimstad Sportsreiser AS | Administrative & support | 2021 |
| Grimstad Squashsenter AS | Real estate | 1993 |
| Grimstad Tannlegesenter AS | Health & social care | 2003 |
| Grimstad Transport AS | Transport & logistics | 2024 |
| Grimstad Treningssenter AS | Arts & recreation | 2008 |
| Grimstad Utvikling AS | Real estate | 2016 |
| Grimstad Ved AS | Agriculture & fishing | 2022 |
| Grimstad Veksthus AS | Agriculture & fishing | 1999 |
| Grimstad Vertshus AS | Hospitality | 1991 |
| Grimstadadvokatene AS | Professional & scientific | 2020 |
| Grimstaden AS | Real estate | 2022 |
| Grimstadgynekologen AS | Health & social care | 2022 |
| Grimstadhus AS | Professional & scientific | 1985 |
| Grimstadporten Næringspark AS | Construction | 2009 |
| Groheim AS | Real estate | 2006 |
| Groos AS | Professional & scientific | 2005 |
| Groos Bolig AS | Real estate | 2015 |
| Groosbygg AS | Real estate | 2007 |
| Grooseveien 17 AS | Wholesale & retail | 2013 |
| Grooseveien Drift AS | Real estate | 2015 |
| Grosvold Boat Production Management AS | Manufacturing | 2016 |
| Grændsen Invest AS | | 2024 |
| Gróa Eiendom AS | | 2023 |
| Grøm Autopark AS | Wholesale & retail | 2007 |
| Grøm Eiendom AS | Real estate | 2002 |
| Grøm Næringspark 19 AS | Real estate | 2023 |
| Grømtoppen AS | Real estate | 2007 |
| Grønn Vekst AS | Water & waste | 2000 |
| Grønn Vekst Rogaland AS | Wholesale & retail | 2011 |
| Grøsle Eiendom AS | Real estate | 2026 |
| Grøsle Rekvisita Ans | Wholesale & retail | 2014 |
| GS Eiendom AS | Real estate | 2020 |
| GS Elektro AS | Wholesale & retail | 2016 |
| GST Group AS | Transport & logistics | 2020 |
| GTS Eiendom AS | Real estate | 2018 |
| Guldmand Eiendom AS | Real estate | 2021 |
| Guldmand Holding AS | Real estate | 2021 |
| Gulestad Gård Ans | Wholesale & retail | 1999 |
| Gull Hudpleie AS | Other services | 2021 |
| Gullregnbukta AS | Real estate | 2005 |
| Gullsmed Unni Storm-Johannsen AS | Manufacturing | 2008 |
| Gunstveit Eiendom AS | Real estate | 2025 |
| Gunstveit Holding AS | Hospitality | 2023 |
| H Astrup Holding AS | | 2026 |
| H L Holding AS | Construction | 2018 |
| H2 House AS | Professional & scientific | 2021 |
| Habitlab AS | Professional & scientific | 2026 |
| Hagen På Frivoll AS | Agriculture & fishing | 2024 |
| Haglund Catering AS | Hospitality | 2026 |
| Haglund Ventures AS | | 2023 |
| Haifaiv AS | Financial services | 2016 |
| Hair 247 | Wholesale & retail | 2019 |
| Halimas TG AS | Hospitality | 2024 |
| Halvorsen Taxi AS | Transport & logistics | 2024 |
| Halwa AS | Real estate | 1975 |
| Hampen Invest AS | Real estate | 2007 |
| Handleriet Groosåsen Ans | Wholesale & retail | 1997 |
| Hans Følsgaard AS | Wholesale & retail | 1986 |
| Hansen Oppmåling AS | Professional & scientific | 2008 |
| Hansp AS | Real estate | 2005 |
| Happy Roll AS | Hospitality | 2019 |
| Happy Time AS | Hospitality | 2025 |
| Happy Time Drift AS | Hospitality | 2023 |
| Happy Time Eiendom AS | Real estate | 2015 |
| Happy Time Eiendoms AS | Real estate | 2022 |
| Happy Time Pizza AS | Hospitality | 2022 |
| Happy Time Pizzeria AS | Hospitality | 2012 |
| Har En Grøm AS | Wholesale & retail | 2019 |
| Harberg AS | Professional & scientific | 2023 |
| Hardebergs Tjenester AS | Transport & logistics | 2016 |
| Harding Eiendom AS | Professional & scientific | 2016 |