| 1798 Invest AS | Real estate | 2021 |
| A. Holth Invest AS | Wholesale & retail | 2012 |
| Aarbu Va SA | Water & waste | 2011 |
| Anni Logistikk AS | Transport & logistics | 2011 |
| Ans Halden Kalkservice | Wholesale & retail | 1990 |
| Ara Eiendomsdrift AS | Real estate | 2014 |
| Ara Maskin AS | Wholesale & retail | 2010 |
| Arasjø Holding AS | Agriculture & fishing | 2017 |
| Aremark Eiendom AS | Hospitality | 2014 |
| Aremark Investering Og Næringsutvikling AS | Arts & recreation | 1997 |
| Aremark Senter AS | Wholesale & retail | 2014 |
| Aremark Servicesenter AS | Wholesale & retail | 2012 |
| Arestad Invest AS | Real estate | 2020 |
| Arethusa AS | Wholesale & retail | 1989 |
| AS Ijati | Real estate | 1980 |
| Bergstrøm Skogsdrift AS | Agriculture & fishing | 2019 |
| Bjørkebekk Sveis & Rep AS | Manufacturing | 2020 |
| Bjørkhaga AS | Professional & scientific | 2007 |
| Brødr. Haugen AS | Transport & logistics | 2012 |
| Brødrene Haugen Ans | Transport & logistics | 1986 |
| Buer Gård AS | Real estate | 2006 |
| Buer Va Drift SA | Water & waste | 2021 |
| Byggmester Ole Henrik Lagerholt AS | Construction | 2022 |
| Bøensætre AS | Education | 2012 |
| Chalit AS | Financial services | 2009 |
| Dagfinn Due Tømrerservice AS | Construction | 2023 |
| Eidos Ans | Education | 2000 |
| Elvegata 7 Halden AS | Real estate | 2016 |
| Espelund Invest AS | | 2020 |
| Ess Engineering AS | Manufacturing | 2016 |
| Ess Performance Products AS | Manufacturing | 2000 |
| Ev Motor AS | Manufacturing | 2018 |
| Fladeby Invest AS | Professional & scientific | 2013 |
| Foodstore AS | Hospitality | 2014 |
| Fosdaltunet AS | Real estate | 2020 |
| Frode Nordgaard AS | Construction | 2019 |
| G-Optikk AS | Wholesale & retail | 1981 |
| Gcom AS | Wholesale & retail | 2021 |
| Glenn Golden AS | Information & communication | 2025 |
| Grenseland AS | Professional & scientific | 2016 |
| Haugeby Oljeservice AS | Wholesale & retail | 1988 |
| Hett Invest AS | Real estate | 2006 |
| Holth Agro AS | Wholesale & retail | 1998 |
| Holth Transport AS | Transport & logistics | 2014 |
| Iee Invest AS | | 2024 |
| Ingebrigtsen & Kirkerød Eiendom AS | | 2013 |
| Isetra Holding AS | | 2022 |
| J. Bergstrøm AS | Real estate | 2026 |
| K & F Holding AS | Hospitality | 2014 |
| Kicki Holding AS | | 2021 |
| Kirkeng Camping Ans | Hospitality | 2003 |
| Kristiania Eiendomsforvaltning AS | Real estate | 2004 |
| Lagerholt & Lagerholt Da | Agriculture & fishing | 2005 |
| Lambas Transport Og Eiendom AS | Real estate | 2020 |
| Lattix AS | | 2020 |
| Lervik Utmarkslag SA | Real estate | 2024 |
| Lillemørk Invest AS | Real estate | 2006 |
| Løkkeberg Gård Og Skog AS | Agriculture & fishing | 2023 |
| Løvtrespesialisten Fange Sag Og Høvleri AS | Manufacturing | 2006 |
| Maria Og Mammas Mat AS | Hospitality | 2023 |
| MB Trefelling AS | Agriculture & fishing | 2026 |
| MLL AS | Wholesale & retail | 2014 |
| Natta Invest AS | Financial services | 2018 |
| Nio Invest AS | | 2021 |
| Nohr Eiendomsservice AS | Administrative & support | 2022 |
| Nordgaard Da | Agriculture & fishing | 2004 |
| Norek AS | Agriculture & fishing | 2025 |
| Norra Dals Brunnsborrning AB | Construction | 1995 |
| Ny Giv AS | Education | 2014 |
| Ny Plast AS | Manufacturing | 2006 |
| Orroz Eiendom AS | Construction | 2012 |
| Primtable AS | Manufacturing | 2014 |
| Running Fast AS | Professional & scientific | 2026 |
| Sandtorp Prosjekt AS | Real estate | 2005 |
| Skjulstad Va SA | Water & waste | 2018 |
| Skodsberg Invest AS | Real estate | 2006 |
| Skodsberg Søndre Da | Agriculture & fishing | 2020 |
| Skogstrandveien 5 AS | Real estate | 2020 |
| Skolleborg Mølle AS | Manufacturing | 2001 |
| Skolleborg Skogservice AS | Agriculture & fishing | 2024 |
| Skotsbergåsen Vel Og Vannlag SA | Water & waste | 2020 |
| Slorer Invest AS | Real estate | 2012 |
| Snusy.No AS | Wholesale & retail | 2021 |
| Spir Gjødsel Da | Wholesale & retail | 1998 |
| Spot Development AS | Professional & scientific | 2014 |
| Techsolution AS | Professional & scientific | 2006 |
| Toasten AS | Hospitality | 2026 |
| Tømrerfirma J.R. Prang AS | Construction | 2016 |
| Verksted Gruppen AS | Professional & scientific | 2023 |
| Vestfjella Utmarkslag SA | Arts & recreation | 2020 |
| Vestfjellaveien SA | Agriculture & fishing | 1981 |
| Villandebo Eiendom AS | Real estate | 2025 |
| Villandebo Holding AS | | 2025 |