| Fiveland Marine AS | Professional & scientific | 2006 |
| Fjordgløtt Terrasse AS | Real estate | 2017 |
| Flex Stathelle AS | Arts & recreation | 2026 |
| Flogstad Elektro AS | Construction | 2022 |
| Flom Kjetting AS | Wholesale & retail | 1985 |
| Fløtningsstrand Bruk AS | Real estate | 2015 |
| FN Holding AS | Real estate | 2007 |
| FN Invest AS | Real estate | 2006 |
| Folkvang Consulting AS | Professional & scientific | 2013 |
| Freelance Living AS | Real estate | 2020 |
| Freelance Projects AS | Professional & scientific | 2020 |
| Frema AS | Health & social care | 2016 |
| Frez AS | Administrative & support | 2025 |
| Frier Byggservice AS | Construction | 2017 |
| Frier Eiendom AS | Real estate | 2018 |
| Frier Eiendomsutvikling AS | Real estate | 2014 |
| Frier HRT AS | Professional & scientific | 2017 |
| Frode Kilen AS | | 2022 |
| Frode Og Bjørn Betongpumping Da | Construction | 2003 |
| Frode Oterholt Holding AS | | 2021 |
| Fru Jensen AS | Wholesale & retail | 2005 |
| Funbox AS | Administrative & support | 2024 |
| Furuveien 8 AS | Real estate | 2020 |
| G.M Holding AS | | 2019 |
| G7 Consulting AS | Information & communication | 2020 |
| Gac AS | Real estate | 2020 |
| Galleri Grindbakken AS | Manufacturing | 2019 |
| Gammo Holding AS | Wholesale & retail | 2024 |
| Garstad Invest AS | Wholesale & retail | 2022 |
| Gaupe AS | Construction | 2025 |
| GBB Grenland Bilbehandeling Ans | Other services | 1999 |
| Geir Stokke Holding AS | | 2018 |
| Geissberg AS | | 2026 |
| GH4S Holding AS | Wholesale & retail | 2021 |
| GJ Consult AS | Professional & scientific | 2024 |
| GK Design AS | Professional & scientific | 2016 |
| GK Gass AS | Wholesale & retail | 2019 |
| Glynitveien 28 AS | Real estate | 2020 |
| God Markedsføring AS | Information & communication | 2026 |
| Gossip AS | Wholesale & retail | 2001 |
| Gowe Holding AS | | 2025 |
| Grashoppa Barnehage AS | Education | 2012 |
| Grasmyr Bil Og MC Service AS | Other services | 2010 |
| Grasmyr Næringspark AS | Real estate | 2024 |
| Grasmyrtunet AS | Real estate | 2012 |
| Gravr AS | Construction | 2024 |
| Grenland Bakeri & Conditori AS | Manufacturing | 2003 |
| Grenland Brass Kvartett Da | Arts & recreation | 2024 |
| Grenland Containerservice AS | Water & waste | 2012 |
| Grenland Eiendomsmegling AS | Real estate | 2005 |
| Grenland Konferansesenter AS | Real estate | 2011 |
| Grenland Minilager AS | Real estate | 2007 |
| Grenland Vaktmesterkompani AS | Administrative & support | 2006 |
| Grillkafen AS | Hospitality | 2025 |
| Grimsrud Investments AS | Real estate | 2017 |
| Growthiogen Invest AS | Professional & scientific | 2019 |
| Grunnsundveien Va-Lag SA | Transport & logistics | 2007 |
| Gusfre Holding AS | Professional & scientific | 2020 |
| Guttetur AS | Administrative & support | 2026 |
| GVK Maskin AS | Administrative & support | 2018 |
| H.Gjerseth Holding AS | Real estate | 2018 |
| H100 Technology AS | Education | 2016 |
| H2-ARCTIC AS | Professional & scientific | 2022 |
| Hab Holding AS | Financial services | 2005 |
| Hafsund Ans | Real estate | 2015 |
| Hafsund Feriehytter AS | Hospitality | 2014 |
| Hafsund-Grundsund-Klokkertangen Vann Og Avløp SA | Water & waste | 2008 |
| Hagane Holding AS | | 2022 |
| Halvorsen Elektro Invest | | 2014 |
| Hamtech Da | Manufacturing | 2025 |
| Hansen & Arntzen Co AS | Manufacturing | 1981 |
| Haro Holding AS | | 2026 |
| Haugen Bygg AS | Construction | 2006 |
| Havparadiset AS | Real estate | 2017 |
| Havsten AS | Wholesale & retail | 2013 |
| Hegna Blikk AS | Construction | 2003 |
| Hegna Maskin AS | Wholesale & retail | 1995 |
| Hella Invest AS | Wholesale & retail | 2005 |
| Hella Maskin AS | Wholesale & retail | 1994 |
| Hella Utleie AS | Administrative & support | 2022 |
| Helmax Olsen AS | | 2020 |
| Helsehuset Strandgaten 20 AS | Real estate | 2017 |
| Helsekost Stathelle AS | Wholesale & retail | 2021 |
| Hercher Invest AS | | 2023 |
| Hermansen VVS & Vedlikehold AS | Construction | 2025 |
| Herre Kraftstasjon AS | Energy | 2008 |
| Herre/Vold Holding AS | | 2020 |
| HG Service AS | Administrative & support | 2026 |
| High Proof Da | Arts & recreation | 2025 |
| Hillsveg 21 AS | Real estate | 2026 |
| HJ Hestad Prosjekt AS | Professional & scientific | 2012 |
| HM Din Holding AS | | 2026 |
| HR Mekanisk AS | Manufacturing | 2021 |
| Hr-Eiendom AS | Real estate | 2018 |
| HS Consulting AS | Professional & scientific | 2007 |
| HSX Maskinutvikling AS | Professional & scientific | 2002 |
| HY4MAR AS | Professional & scientific | 2024 |
| Hågen.No AS | Wholesale & retail | 2026 |
| Høgenhei Eiendom AS | Real estate | 2009 |
| Høier Kompetanse AS | Professional & scientific | 2011 |