| 3H Holding AS | Real estate | 2005 |
| Alver Utvikling & Utleie AS | Water & waste | 2023 |
| Anders Duesund AS | Wholesale & retail | 2016 |
| Bergen Ekspertisesenter AS | Professional & scientific | 2007 |
| Bøvågen Service AS | Real estate | 1996 |
| CCB Mongstad AS | Transport & logistics | 1991 |
| Consensus Holding AS | Real estate | 2010 |
| DVS Vandteknik | Water & waste | 2011 |
| Equinor Refining Norway AS | Manufacturing | 2016 |
| Falck Agency AS | Transport & logistics | 1999 |
| Fonnestunet AS | Real estate | 2000 |
| Idp Mongstad AS | Water & waste | 2025 |
| Invicta Holding AS | | 2022 |
| Jernbro Industrial Services A/S Nuf | Construction | 1995 |
| Jernbro Industrial Services AS | Construction | 2011 |
| K/S Rafinor A/S | Real estate | 1971 |
| Kalandstunet 168 AS | Real estate | 2008 |
| Lindås Sjøbad AS | Other services | 2024 |
| Litlås Industribygg AS | Real estate | 1985 |
| Magne Hope AS Entreprenørforretning | Construction | 1975 |
| Mongstad Auto Marine AS | Other services | 2016 |
| Mongstad Bil & Dekk AS | Other services | 2021 |
| Mongstad Industribygg AS | Real estate | 2007 |
| Mongstad Service AS | Manufacturing | 2001 |
| Mongstad Tavleteknikk AS | Manufacturing | 2008 |
| Mongstad Terminal Da | Mining & quarrying | 2001 |
| Mongstad Utleie AS | Administrative & support | 2001 |
| Mongstadkrysset AS | Real estate | 2021 |
| Nomaco Services AS | Administrative & support | 1994 |
| Norbo Invest AS | Real estate | 2007 |
| Nordhordland Grunn Og Betong AS | Construction | 2006 |
| Nordhordland Grunn Og Betong Invest AS | | 2019 |
| Norshapes AS | Professional & scientific | 2020 |
| Northheat Services AS | Manufacturing | 2023 |
| Nstc AS | Wholesale & retail | 2015 |
| Nstc Holding AS | Wholesale & retail | 2020 |
| O a Snekkevik AS | Wholesale & retail | 1956 |
| Ocean Recruitment & Competence AS | Education | 2017 |
| Parishola Utbygging AS | Real estate | 2011 |
| PSW Solutions AS | Mining & quarrying | 2012 |
| PSW Technology AS | Mining & quarrying | 2006 |
| Raugstad Eiendom AS | Real estate | 2006 |
| Raugstad Eiendom Invest AS | | 2019 |
| Raugstad Holding AS | | 2006 |
| RS Dekk AS | Wholesale & retail | 2010 |
| RV Eiendom AS | Real estate | 2009 |
| RV Invest AS | Administrative & support | 2009 |
| RV Service AS | Administrative & support | 2007 |
| Rafinor AS | Real estate | 1971 |
| Saybolt Norway AS | Professional & scientific | 2003 |
| Svein Invest AS | Wholesale & retail | 2005 |
| Technology Centre Mongstad Da | Professional & scientific | 2017 |
| Torque Engineering AS | Professional & scientific | 2025 |
| Torque Holding AS | | 2025 |
| W. Raugstad AS | | 2020 |
| West Asset Management AS | Mining & quarrying | 2023 |
| West Piping AS | Manufacturing | 2014 |