| Grenland Rail AS | Transport & logistics | 2022 |
| Grenland Rail Holding AS | Transport & logistics | 2022 |
| Grenland Rail Materiell AS | Administrative & support | 2023 |
| Grenland Regnskap AS | Professional & scientific | 2012 |
| Grenland Renhold AS | Administrative & support | 2023 |
| Grenland Sand & Grus AS | Mining & quarrying | 2019 |
| Grenland Spesialistsenter AS | Health & social care | 2021 |
| Grenland Sport AS | Wholesale & retail | 2008 |
| Grenland Sprengningsservice AS | Construction | 2000 |
| Grenland Steinlegging Og Hagearbeid AS | Construction | 2013 |
| Grenland Synssenter AS | Wholesale & retail | 2008 |
| Grenland Transport Og Hage AS | Transport & logistics | 2025 |
| Grenland Transportservice AS | Transport & logistics | 2020 |
| Grenland Trefelling AS | Agriculture & fishing | 2018 |
| Grenland Utleie AS | Wholesale & retail | 2016 |
| Grenland Utvendig Vask AS | Administrative & support | 2022 |
| Grenland Utvikling AS | Real estate | 2012 |
| Grenland Ønh Praksis Da | Health & social care | 2020 |
| Grenland Øyelegesenter AS | Health & social care | 2014 |
| Grenlands Gutta AS | Construction | 2026 |
| Grenlandsbingo 1 AS | Arts & recreation | 1993 |
| Grenrør AS | Construction | 2025 |
| Gri Capital AS | Real estate | 2022 |
| Grini 48 Invest AS | | 2021 |
| Grinitoppen Eiendom AS | Real estate | 2016 |
| Grivest AS | Construction | 2016 |
| Grohs Holding AS | Financial services | 2015 |
| Grounding AS | Wholesale & retail | 2023 |
| Grovet AS | | 2021 |
| GRS Invest AS | Real estate | 2017 |
| Gryn Invest AS | Real estate | 2007 |
| Gråtenmoen Trening AS | Arts & recreation | 2023 |
| Grått Og Grønt Holding AS | | 2016 |
| Grønland Holding AS | | 2019 |
| Grønli Og Sønner AS | Construction | 1998 |
| Grøntklima AS | Wholesale & retail | 2017 |
| GS Bygg AS | Construction | 2021 |
| GS Dagligvaredrift AS | Wholesale & retail | 2015 |
| GS Hogst Og Maskin AS | Agriculture & fishing | 2019 |
| GS Montasje AS | Construction | 2025 |
| GTK Auto AS | Wholesale & retail | 2021 |
| Guardtex - Norway AS | Construction | 2008 |
| Gudis Holding AS | Wholesale & retail | 2024 |
| Gullesen Holding AS | | 2026 |
| Gullferie AS | | 2020 |
| Gullik Agri AS | Professional & scientific | 2020 |
| Gulliksen Da | Professional & scientific | 1993 |
| Gulliksen Profil Og Event AS | Professional & scientific | 2018 |
| Gulliksen-Eiendom AS | Real estate | 2016 |
| Gulliksen-Holding AS | Construction | 2016 |
| Gullmannen Skien AS | Wholesale & retail | 2026 |
| Gullsmed H Christoffersen AS | Wholesale & retail | 1977 |
| Gulset Bilvask AS | Wholesale & retail | 2022 |
| Gulset Eiendomsinvest AS | Real estate | 1999 |
| Gulset Fades AS | Other services | 2021 |
| Gulset Grill Og Pizza AS | Hospitality | 2010 |
| Gulset Isenkram AS | Wholesale & retail | 1979 |
| Gulset Legekontor Da | Health & social care | 2016 |
| Gulset Optikk AS | Wholesale & retail | 2021 |
| Gulsetveien 80 AS | Real estate | 2018 |
| Gummigutt Holding AS | | 2022 |
| Gundersen Utvikling AS | Real estate | 2019 |
| Gunn Vintervold Trening Og Kosthold AS | Arts & recreation | 2020 |
| Gunnar Borgen Eiendom AS | Real estate | 1999 |
| Gunnar Knudsens Veg 144 AS | Real estate | 2024 |
| Gunnestad Invest AS | Professional & scientific | 2011 |
| Guntor Holding AS | Wholesale & retail | 2015 |
| Guntor Plastic AS | Wholesale & retail | 1994 |
| Guru Finans AS | Information & communication | 2025 |
| Gustavsen Bil AS | Other services | 2025 |
| Gvaala Holding AS | Real estate | 2005 |
| Gvarvgata 11 AS | Real estate | 2015 |
| Gvu AS | Administrative & support | 2022 |
| GWL Invest AS | | 2025 |
| Gydas Gate 9 AS | Real estate | 2021 |
| Gyllenlakk Gylne Tider AS | Wholesale & retail | 1994 |
| Gårdsons Containerutleie Ans | Water & waste | 1990 |
| Gåre AS | Administrative & support | 2005 |
| Gøyes Hundeklippotek AS | Other services | 2021 |
| H & Ro Da | Real estate | 2009 |
| H H Prosjektassistanse AS | Professional & scientific | 2006 |
| H H Rasmussen AS | Construction | 2005 |
| H&B Investment Group AS | Real estate | 2024 |
| H&C-Holding AS | Real estate | 2023 |
| H&G Tannhelse AS | Health & social care | 2017 |
| H&H Gruppen AS | Professional & scientific | 2022 |
| H-P Invest AS | Wholesale & retail | 2010 |
| H. Gonsholt AS | | 1966 |
| H2 Kapital AS | | 2026 |
| Haag AS | Real estate | 2024 |
| Habakken AS | Education | 2022 |
| Hadh Holding AS | | 2021 |
| Haf Grenland AS | Wholesale & retail | 2009 |
| Hageby Elektro AS | Construction | 2023 |
| Hagebyvegen 38 Invest AS | Real estate | 2019 |
| Hagebyveien 26 AS | Real estate | 1975 |
| Hagebyvn. 39 AS | Real estate | 2005 |
| Hagehuggern AS | Agriculture & fishing | 2013 |
| Hagelaget Finans Da | Financial services | 2008 |
| Haig AS | Information & communication | 2022 |