| Daniel Pocieznicki | Construction | 2007 |
| Dariusz Minga | Construction | 2007 |
| DC Sarpsborg AS | Information & communication | 2020 |
| De Flon Montasje AS | Construction | 2024 |
| Depend Norge AS | Wholesale & retail | 1993 |
| Designkupp AS | Wholesale & retail | 2005 |
| Dewbit AS | Information & communication | 2013 |
| Diedrichsen AS | Construction | 2016 |
| Diedrichsen Eiendom AS | | 2012 |
| Digify AS | Information & communication | 2015 |
| Dikeveien 16 AS | Real estate | 2023 |
| Dillingtoppen 19 AS | Real estate | 2025 |
| DN Holding AS | Real estate | 2008 |
| Doodle AS | Information & communication | 2026 |
| DT Byggservice AS | Construction | 2021 |
| Dyhre Invest AS | Financial services | 2016 |
| Dyrenettbutikken AS | Wholesale & retail | 2019 |
| E-Kvalheim Bilsalg AS | Wholesale & retail | 2021 |
| Eaada Invest AS | | 2015 |
| Ekebergveien & Greåkerveien AS | Real estate | 2025 |
| Electrix AS | Construction | 2020 |
| Electrix Industry AS | Construction | 2020 |
| Elma Frisør Og Velvære AS | Other services | 2022 |
| Engelsrud Eiendom AS | Real estate | 1987 |
| Entrep AS | Construction | 2020 |
| Entreprenør Kjell Mørk AS | Construction | 2004 |
| Espon Holding AS | | 2021 |
| Family Trening Sarpsborg AS | Arts & recreation | 2000 |
| Fantastiskt AS | Health & social care | 2019 |
| Feelgood Nedre Glomma AS | Arts & recreation | 2026 |
| Fernløf AS | Professional & scientific | 2013 |
| Finanzee Holding AS | | 2023 |
| Findity Norway AS | Information & communication | 2018 |
| Fjeldberg Invest AS | Wholesale & retail | 2019 |
| Fjeldberg Tech Holding AS | Information & communication | 2019 |
| Fjell & Betong AS | Construction | 2024 |
| Fjellberg Vann Og Avløp SA | Water & waste | 2008 |
| Flin Holding AS | Administrative & support | 2021 |
| Flogvit Holding AS | | 2026 |
| Flytackle Norway AS | Wholesale & retail | 2026 |
| Fraternitas Eiendom AS | Real estate | 2003 |
| Friends Holding AS | Real estate | 2005 |
| Fysiobemer AS | Health & social care | 2005 |
| G&M Transport | Wholesale & retail | 2020 |
| Galant Forsikring Øst AS | Financial services | 2024 |
| Gamle Kongevei Transport AS | Transport & logistics | 2024 |
| Geir Trygstad AS | Construction | 2019 |
| Gerisale Multi Trade AS | Wholesale & retail | 1994 |
| Ghost Rider AS | Transport & logistics | 2021 |
| Gloa AS | Real estate | 2020 |
| Godtfred Eiendom AS | Real estate | 1991 |
| Green Halden AS | Professional & scientific | 2022 |
| Gressvik Allé 3 AS | Real estate | 2022 |
| Greåkerveien 159 AS | Real estate | 2025 |
| Grindstad Lydersen Advokatfirma AS | Professional & scientific | 2005 |
| Grogu Holding AS | | 2025 |
| Grovcalibr AS | | 2024 |
| Grålum Bil AS | Wholesale & retail | 2024 |
| Grålum Bygg AS | Construction | 2019 |
| Grålum Grill 1 AS | Hospitality | 2019 |
| Grålum Terrasse AS | | 2017 |
| Grålum VVS AS | Construction | 2022 |
| Grålumveien 205 AS | Real estate | 1983 |
| Guldkorn SA | Other services | 2013 |
| Gunnar Høvik AS | Construction | 1993 |
| H.A.G Holding AS | | 2020 |
| H.H. Tretjenester AS | Manufacturing | 2005 |
| Haav AS | Construction | 2024 |
| Hans Company AS | Professional & scientific | 2019 |
| Haram Kraft AS | Energy | 2003 |
| Haugelihus AS | Construction | 1989 |
| Haugsten Butikkdrift Grålum AS | Wholesale & retail | 2022 |
| He Consult AS | Professional & scientific | 2021 |
| Helgebyveien Utvikling AS | Real estate | 2021 |
| Helgesen Holding AS | Wholesale & retail | 2023 |
| Herfjord Holding AS | Professional & scientific | 2017 |
| Heyo Heyo AS | Information & communication | 2025 |
| HGS Engineering Inc. Nuf | Professional & scientific | 2024 |
| Hir Eiendom AS | Real estate | 2024 |
| Holstad Våpen AS | Wholesale & retail | 2006 |
| Huggy AS | | 2021 |
| Hundebarnehagen I Østfold AS | Other services | 2017 |
| Husby Invest & Holding AS | Real estate | 2008 |
| Høvik Holding AS | Real estate | 2005 |
| Høysand Vann- Og Avløpslag SA | Water & waste | 2008 |
| I Am Sound Automotive AS | Wholesale & retail | 2009 |
| Img Invest AS | | 2019 |
| Infotjenester AS | Wholesale & retail | 2015 |
| Infraservice AS | Professional & scientific | 2014 |
| Inspiria Eiendom AS | Arts & recreation | 2005 |
| Inspiria Science Center AS | Arts & recreation | 2009 |
| Inspiria Utvikling AS | Real estate | 2010 |
| Integrera AS | Information & communication | 2020 |
| Intuvio AS | Information & communication | 1997 |
| Isea AS | Professional & scientific | 2013 |
| Isfritt AS | Wholesale & retail | 2007 |
| Isoenergi Øst AS | Construction | 2026 |
| Isy Da | Manufacturing | 2010 |
| J & J Eiendom AS | Real estate | 2012 |
| Jadidi Holding AS | | 2025 |