| Pedersenholding AS | | 2024 |
| Pia & Anna International Da | Wholesale & retail | 2001 |
| Platinium Networks AS | Information & communication | 1990 |
| Pukka Da | Manufacturing | 2004 |
| Qualis Utvikling AS | Real estate | 2014 |
| Raggsokk Holding AS | | 2025 |
| Raumartoppen AS | Agriculture & fishing | 2004 |
| Raumartoppen Holding AS | Real estate | 2015 |
| Re Varmepumper AS | Wholesale & retail | 2011 |
| Redecor AS | Construction | 2020 |
| Reierstad Maskin AS | Construction | 2019 |
| Reikvam Rådgivning AS | Professional & scientific | 2010 |
| Romerike Energi AS | Construction | 1977 |
| Romerike Grønt SA | Wholesale & retail | 2015 |
| Ruud & Ruud Bygg Ans | Construction | 2003 |
| Ruud IT AS | Information & communication | 2017 |
| Select Car AS | Wholesale & retail | 2022 |
| Sentral AS | Professional & scientific | 2025 |
| Skogbunn Mikromusheri AS | Agriculture & fishing | 2025 |
| Skreiva Invest AS | Real estate | 2024 |
| Sletholen Eiendom AS | Real estate | 2006 |
| Slowboy AS | Information & communication | 2023 |
| Smakfulle Rom AS | Hospitality | 2015 |
| Smartways AS | Transport & logistics | 2018 |
| Smedsrud Alpakkagård AS | Arts & recreation | 2020 |
| Solkaffe AS | Wholesale & retail | 2021 |
| Solli Holding & Invest AS | | 2023 |
| Styrk Profil AS | Professional & scientific | 2021 |
| Suderheim Lager AS | Transport & logistics | 2024 |
| Sudrheim Eiendom Da | Real estate | 2010 |
| Sudrheim Samdrift Da | Agriculture & fishing | 2010 |
| Sulerud AS | Administrative & support | 2013 |
| SV Service AS | Transport & logistics | 2023 |
| Sørli Maskinlag AS | Agriculture & fishing | 2020 |
| Sørum Aktivitetspark AS | Arts & recreation | 2015 |
| Sørum Bil Og Maskinrekvisita AS | Wholesale & retail | 1952 |
| Sørum Dekksenter AS | Wholesale & retail | 2009 |
| Sørum Landbruksdrenering AS | Construction | 2023 |
| Sørum Rør Og Bad AS | Construction | 2012 |
| Sørum Transport Og Håndverkertjenester AS | Transport & logistics | 2020 |
| Sørum Utleie AS | Administrative & support | 2025 |
| T&B Hansen Eiendom AS | Real estate | 2024 |
| T&B Hansen Holding AS | Construction | 2024 |
| T&B Hansen Installasjon AS | Construction | 2024 |
| Talåsen AS | | 2019 |
| TDB Holding AS | Construction | 2024 |
| Teknisk Energi AS | Professional & scientific | 2024 |
| TH Eiendomsservice AS | Administrative & support | 2023 |
| Tove Kirsebom Regnskapsservice A/S | Professional & scientific | 1987 |
| TR Samdrift Da | Agriculture & fishing | 2000 |
| Tuv Krankontroll AS | Professional & scientific | 2016 |
| Tveit Og Hansen AS | | 2025 |
| Tynning Og Hogst AS | Agriculture & fishing | 2021 |
| TZ Anlegg AS | Construction | 2023 |
| Tømrermester T-E Fladeby AS | Construction | 2026 |
| Ullsokk Holding AS | | 2025 |
| Utetjenester AS | Construction | 2024 |
| Vatterud Boliger AS | Construction | 2008 |
| Veid AS | Wholesale & retail | 2005 |
| Verdis Environment Midco AS | | 2023 |
| Verdis Nordic AS | Water & waste | 2018 |
| Veridi AS | Professional & scientific | 2019 |
| Viken Bygdeservice AS | Administrative & support | 2022 |
| Vip House AS | Construction | 2020 |
| Vivangmyra AS | Financial services | 2005 |
| VLD Norge AS | Construction | 2006 |
| Wankel Service AS | Other services | 2022 |
| Øivind Dahl Holding AS | Real estate | 2000 |