| Hølandsveien 18 Ans | Real estate | 1997 |
| Hølandsveien 6 Ny AS | Real estate | 2018 |
| Indre Østfold Regnskapsbyrå SA | Professional & scientific | 1946 |
| Indre Østfold Takst AS | Professional & scientific | 2015 |
| Indresalong AS | Other services | 2021 |
| Industriteknikk 1 AS | Manufacturing | 2019 |
| Innovi AS | Health & social care | 1992 |
| Intern Utleie AS | Administrative & support | 2022 |
| Iselin Wedding AS | Financial services | 2005 |
| Itdok AS | Information & communication | 2024 |
| Iø Multisporthall Eiendom AS | Arts & recreation | 2020 |
| Jan FR. Bjerkenes Holding AS | Real estate | 2006 |
| JC Pukkdrift AS | Mining & quarrying | 2023 |
| Jern Og Metall AS | Real estate | 2014 |
| John Haugen AS | Wholesale & retail | 1977 |
| John Haugen Ny AS | Wholesale & retail | 2018 |
| Kadrian Translations AS | Professional & scientific | 2023 |
| Kallak Environmental Protection AS | Professional & scientific | 2013 |
| Kampenesfjellet AS | Mining & quarrying | 2025 |
| Kjartans Honning AS | Agriculture & fishing | 2020 |
| Kko Invest AS | Real estate | 2021 |
| Knut Aarum AS | Construction | 2024 |
| Koftami Da | Arts & recreation | 2018 |
| La Bemanning AS | Administrative & support | 2024 |
| La Moe Holding AS | Real estate | 2022 |
| Lag AS | Professional & scientific | 2015 |
| Langstad & Sønn AS | Transport & logistics | 2002 |
| Lbe AS | Construction | 2017 |
| Lbu AS | Construction | 2015 |
| Lidogroom AS | Other services | 2024 |
| Lille Busterud Ans | Agriculture & fishing | 2011 |
| Lucky 13 AS | Transport & logistics | 2025 |
| Lydsystemer AS | Arts & recreation | 2024 |
| Løvestad Holding & Invest AS | Administrative & support | 2014 |
| M.R Holding AS | Financial services | 2016 |
| Madisa Consulting AS | Professional & scientific | 2014 |
| Malthan Holding AS | Construction | 2024 |
| Mansrud Holding AS | Financial services | 2006 |
| Maurtuveien 6 AS | Real estate | 2016 |
| Menighetsbarnehagen I Trøgstad AS | Education | 2019 |
| Mflk Invest AS | Wholesale & retail | 2018 |
| Mikkelsbu AS | Real estate | 2023 |
| Minges Universal Service AS | Manufacturing | 2015 |
| Moda Agentur Ans | Wholesale & retail | 1998 |
| Moe Invest AS | | 2021 |
| Mors Produkter AS | Wholesale & retail | 1996 |
| Morten Wardenær Øien Transport AS | Transport & logistics | 2012 |
| Motorpark Indre Østfold AS | Administrative & support | 2014 |
| Myhrvold Eiendom AS | Real estate | 2018 |
| Myhrvold Holding AS | Real estate | 2017 |
| Mysen Port Og Gjerdeservice AS | Construction | 2021 |
| Next Level Prints AS | Professional & scientific | 2025 |
| Nordeng-Engebråten Holding AS | Manufacturing | 2017 |
| Nordic Auto Exchange Group AS | | 2025 |
| Nordic Vault AS | Wholesale & retail | 2026 |
| Norsk God Smak Da | Hospitality | 2025 |
| Norsk Urkorn AS | Manufacturing | 2013 |
| Nova Performance AS | Education | 2026 |
| NTT Bygg Service AS | Construction | 2018 |
| Nyengen Bygg Og Eiendom AS | Construction | 2010 |
| O N Montasje Og Service AS | Real estate | 1990 |
| O.M. Eiendom AS | Real estate | 2016 |
| Ole Mellegaard AS | Transport & logistics | 2000 |
| Onyx Byggeservice AS | Construction | 2025 |
| Oslo Snø & Vedlikehold AS | Administrative & support | 2012 |
| Per Haakaas AS | Hospitality | 2005 |
| PKR Holdings AS | Construction | 2014 |
| PKR Newco AS | Real estate | 2026 |
| Procurement AS | Construction | 2019 |
| Proffbuss AS | Administrative & support | 2021 |
| R-M Eiendom AS | Real estate | 2020 |
| R.Bygg AS | Construction | 2017 |
| R.Bygg Eiendom AS | Construction | 2017 |
| R.Bygg Holding AS | Construction | 2018 |
| R.O.D. Eiendom AS | | 2013 |
| Raasok Transport AS | Transport & logistics | 2006 |
| Rama Consulting Da | Information & communication | 2018 |
| Rawfor Norge AS | Manufacturing | 2023 |
| Rhinex Take Away Og Storkiosk Avd. Trøgstad AS | Wholesale & retail | 2021 |
| Ringstad T. Holding AS | | 2025 |
| Rm-Holding AS | Real estate | 1999 |
| Rm-Kutt AS | Manufacturing | 2015 |
| Roar Wedding AS | Hospitality | 2005 |
| Rohde Consulting AS | Professional & scientific | 2025 |
| Romerike Armering AS | Construction | 2009 |
| Rør Og Anleggsteknikk AS | Construction | 2026 |
| Rør Og Varmeteknikk AS | Construction | 2025 |
| Rørhus Bilmegling AS | Wholesale & retail | 2025 |
| Sagene Bad Utleie AS | Real estate | 2024 |
| Sagene Utvikling AS | Real estate | 2015 |
| Salong Strå Da | Other services | 2012 |
| Saltkjel AS | Transport & logistics | 2012 |
| Sandvik-Holding AS | Construction | 2021 |
| Sebesa AS | Transport & logistics | 2024 |
| Semtrade AS | Professional & scientific | 2018 |
| Serigrafiservice AS | Manufacturing | 1999 |
| SH Bygg & Eiendom AS | Real estate | 2021 |
| Siuta Sowa Holding AS | | 2024 |
| Skjønhaugenga AS | Real estate | 2018 |
| Skullerud AS | Construction | 1999 |