| Aim Pyro AS | Arts & recreation | 2019 |
| Alajab Holding AS | | 2023 |
| Ametyst Frisør Og Velvære AS | Other services | 2019 |
| Anita Valleraune AS | Real estate | 2014 |
| Ankano AS | Information & communication | 2019 |
| Artell Invest AS | Professional & scientific | 2006 |
| Asbjørn M Skoglund AS | Manufacturing | 1969 |
| Bardun Holding AS | Health & social care | 2019 |
| BKR AS | Administrative & support | 2020 |
| BNG Asset Management AS | Real estate | 2024 |
| Bolig-Prosjekt AS | Construction | 2010 |
| Borg Opplevelser Da | Arts & recreation | 2000 |
| Borg Trykk AS | Manufacturing | 1987 |
| Borge Industri & Service AS | Manufacturing | 2012 |
| BRM 1 AS | Professional & scientific | 2013 |
| BRT Caravan Kjøkken Da | Wholesale & retail | 2006 |
| Bråtveit AS | Professional & scientific | 2006 |
| Brødrene Gundersen Invest AS | Real estate | 2012 |
| Burandt Eiendom AS | Real estate | 2015 |
| Bussevika Vann- Og Avløpslag SA | Water & waste | 2008 |
| Byggmester Arild Arvesen AS | Construction | 1991 |
| Bøhaugen Eiendom AS | Wholesale & retail | 1998 |
| Christiansen Eiendom AS | Real estate | 2020 |
| Come on AS | Wholesale & retail | 2015 |
| Counted Labs AS | Information & communication | 2025 |
| Dazed & Confused Da | Arts & recreation | 1997 |
| Downtown Pub AS | Hospitality | 2022 |
| Drager Holding AS | | 2026 |
| Eben Holding AS | | 2026 |
| Ekhaugen Transport AS | Transport & logistics | 2022 |
| Endeavours & Co. AS | Professional & scientific | 2025 |
| Erak Holding AS | | 2018 |
| Flavoris AS | Wholesale & retail | 2025 |
| Flowify Pro AS | Professional & scientific | 2026 |
| Focus Engros AS | Wholesale & retail | 2021 |
| Focus Multiservice AS | Administrative & support | 2020 |
| Foss Byggservice AS | Construction | 2019 |
| Freddy Mathisen AS | Construction | 1998 |
| Fredriksen Legetjenester AS | Health & social care | 2024 |
| G Strand Holding AS | | 2024 |
| G. Strand Eiendom AS | Real estate | 2025 |
| GCS Holding AS | | 2023 |
| Grandahl Bolig AS | Real estate | 2025 |
| Gravehjelpen Runar Walther AS | Construction | 2020 |
| Green Racing AS | Manufacturing | 2020 |
| Gruner Maskin AS | Administrative & support | 2026 |
| Gullsmed Eliassen AS | Wholesale & retail | 2026 |
| Gulo Holding AS | Administrative & support | 2010 |
| Gundersen Eiendom AS | Real estate | 1982 |
| Gundersen Galvano AS | Manufacturing | 2020 |
| Hafslund Transport AS | Transport & logistics | 2025 |
| Hafslundsøy Legesenter AS | Health & social care | 2019 |
| Hagby Holding AS | | 2026 |
| Hasle Barnehage AS | Education | 2022 |
| Hasle Trafo 35 AS | Real estate | 2018 |
| Hassel Arnesen Holding AS | Financial services | 2014 |
| Haugeneset Holding AS | | 2021 |
| Helgeby Anlegg AS | Construction | 2024 |
| Helgeby Eiendom AS | Real estate | 2005 |
| Helse Nilsen AS | Health & social care | 2006 |
| Henriksen Multiservice AS | Administrative & support | 2021 |
| Herol AS | | 2015 |
| Hindklefjell AS | Real estate | 2024 |
| HMB Holding AS | Financial services | 2017 |
| Hybelhus AS | Real estate | 2020 |
| Hæren Blåseisolering AS | Construction | 2023 |
| Intercel Logistics AS | Transport & logistics | 2024 |
| Jellestadveien 33 AS | Real estate | 2025 |
| JWJ Holding AS | Wholesale & retail | 2024 |
| Kampenesmosen 23 AS | Real estate | 2021 |
| Koverik AS | Information & communication | 2023 |
| Kristoffer Brenne AS | | 2021 |
| Kultorp Bilservice AS | Other services | 2019 |
| Kultorp Holding AS | Real estate | 2007 |
| Lars Erik Lunde AS | Construction | 2025 |
| Lel Eiendom AS | Real estate | 2020 |
| Lel Forvaltning AS | Construction | 2013 |
| Liverbirds Sarpsborg | Other services | 2012 |
| M.A. Beauty Clinic AS | Health & social care | 2025 |
| M.R Sulten AS | Hospitality | 2021 |
| Madam Arnesensvei 43 AS | Real estate | 2006 |
| Malerfirmaet Gåserød AS | Construction | 2020 |
| Martin Foss Holding AS | Construction | 2019 |
| Maruwa Anlegg & Eiendom AS | Administrative & support | 2006 |
| Maruwa Holding AS | Construction | 1999 |
| Mcwere Helsetjenester AS | Health & social care | 2008 |
| Mesterbygg Sarpsborg AS | Construction | 2004 |
| Mesterbygg Utleie AS | Administrative & support | 2024 |
| Mestermur Sarpsborg AS | Construction | 2011 |
| Mette's Interiør AS | Wholesale & retail | 2002 |
| Minilokaler AS | Real estate | 2024 |
| Minimaskiner AS | Administrative & support | 2010 |
| Mito Import Da | Wholesale & retail | 2007 |
| MM Snekker AS | Construction | 2024 |
| Mobråten Medispa AS | Health & social care | 2023 |
| Motorsport Event AS | Administrative & support | 2013 |
| Multipluss AS | Education | 2025 |
| Naturlige Såper Da | Other services | 2006 |
| Nielleve AS | Other services | 2018 |
| Nordbyveien 151 AS | Real estate | 2025 |