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| Maya Frigg AS | Oslo | 2024 |
| Maya Geological Service Limited | Bath Ba2 4Rb | 2014 |
| Maya Styling AS | Oslo | 2024 |
| Mayana AS | Tjodalyng | 2024 |
| Mayapapaya AS | Jar | 2019 |
| Maybente AS | Hafrsfjord | 2017 |
| Maycan AS | Melhus | 2022 |
| Maycroft Consulting Ltd | Ts24 7Dn Hartlepool | 2016 |
| Mayday Design Limited | Berkshire Rg42 1Uf | 2019 |
| Mayerling AS | Sandnessjøen | 2012 |
| Mayfair Consulting Group AS | Oslo | 2024 |
| Mayka AS | Nesodden | 2020 |
| Maymedia AS | Eiksmarka | 2020 |
| Mayor Holding AS | Hafrsfjord | 2023 |
| Mayor Solutions AS | Hafrsfjord | 2021 |
| Maytek AS | Kristiansand S | 2017 |
| Mayti AS | Lepsøy | 2023 |
| Maytimber AS | Tønsberg | 2017 |
| Mazars Accounting Int AB Nuf | Se-203 13 Malmö | 2023 |
| MB Barva Furmiture | Lt-92441 Klaipeda | 2021 |
| MB Business Development AS | Oslo | 2017 |
| MB Byggeledelse AS | Oslo | 2023 |
| MB DK Projects Nuf | Gjerdrum | 2025 |
| MB Group AS | Ålesund | 2025 |
| MB Henriksen Holding AS | Tønsberg | 2025 |
| MB Holding Norway Nuf | Lv-2164 Adazu Novads | 2020 |
| MB Holdings AS | Kolsås | 2022 |
| MB Hotellkonsult AS | Oslo | 2024 |
| MB Konserntjenester AS | Bergen | 2000 |
| MB Kursiu Projektas Nuf | Gjerdrum | 2026 |
| MB Mekas | Lt-01205 Vilnius | 2019 |
| MB Norway AS | Røyken | 2008 |
| MB Partner AS | Lillehammer | 2017 |
| MB Pro AS | Mosjøen | 2020 |
| MB Regnskap AS | Sørumsand | 2024 |
| MB Tolk AS | Siggerud | 2024 |
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| Mb:Ark AS | Oslo | 2008 |
| Mba Strategier AS | Oslo | 2026 |
| Mbat AS | Ørje | 2012 |
| Mbbredal AS | Sandefjord | 2026 |
| Mbellika AS | Alta | 2022 |
| Mbes - Moss Bygg Og Eiendomsservice AS | Moss | 2020 |
| Mbit AS | Sandvika | 2026 |
| MBM AS | Tønsberg | 2008 |
| Mbmultimedia AS | Stavanger | 2012 |
| Mbo Holding AS | Oslo | 2018 |
| Mbo Invest AS | Hafrsfjord | 2011 |
| MBR Regnskap AS | Svartskog | 2023 |
| MBS Consult AS | Bekkestua | 2009 |
| MBS Modeling AS | Hamar | 2019 |
| MC Wood Nuf | Lt-54431 Satiju K Lapes Kauno Raj. | 2024 |
| Mca Mercur Corporate Advisors AS | Trondheim | 2013 |
| Mcavoy International Pipeline Services Ltd | Gb Wrexham Ll11 4Ax | 2021 |
| Mcbain Subsea Services Ltd | Ab22 8Sa Aberdeen | 2018 |
| MCC Holding AS | Sande I Vestfold | 2020 |
| Mccardle Invest AS | Sandnes | 2025 |
| Mcclannan Ltd | Tyne And Wear Ne13 7Fh England | 2018 |
| Mcdonald Nitrogen Process Services Ltd | Ka24 5Dw Ayrshire | 2016 |
| MCG Professionals Limited | London Ec1V 9Ee | 2014 |
| Mcginley Systems International Limited | Herts Wd17 1Jw | 2015 |
| Mcgraine Marine Services Ltd | Glasgow G3 6Aa Scotland | 2015 |
| Mcguinness NDT Solutions Ltd | Caerphilly Df83 3Qa | 2014 |
| Mchb AS | Oslo | 2025 |
| Mcinerney Holding AS | Kristiansand S | 2021 |
| Mckendrick Consulting AS | Stavanger | 2019 |
| Mckendrick Engineering Limited | London Nw5 2Be England | 2015 |
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| Mckinsey & Company, Inc. Qatar | 19 808 Country Of New Castle | 2015 |
| Mclean Consulting AS | Nesøya | 2020 |
| Mclean Projects & Investments AS | Oslo | 2016 |
| Mcleod Geo Projects Limited | Aberdeen Ab15 9Ah | 2013 |
| Mcleod Offshore Tools AS | Hylkje | 2023 |
| MCM AS | Oslo | 2006 |
| MCM Holding AS | Os | 2010 |
| MCM Media Og Design AS | Songe | 2023 |
| Mcmurdo Associates Ltd | Kilwinning, Ayrshire Ka 13 6Uw | 2013 |
| Mcneill Projects AS | Kristiansand S | 2025 |
| Mco Gruppen AS | Oslo | 2024 |
| Mcofee Subsea Ltd | Ab51 6Aa Aberdeenshire | 2019 |
| Mconsulting AS | Oslo | 2020 |
| MCR AS | Forsand | 2019 |
| MCS Maskinering AS | Laksevåg | 2005 |
| MD Arkitekter AS | Elnesvågen | 2022 |
| MD I Mora AB | Se-746 96 Skokloster | 2011 |
| MD Interiørprosjekt AS | Bekkestua | 2007 |
| MD Wind | Lu-9991 Weiswampach | 2013 |
| Mdalen AS | Leinstrand | 2023 |
| Mdco Rådgivning AS | Oslo | 2008 |
| Mde Group AS | Stavanger | 2011 |
| MDH Arkitekter AS | Oslo | 2010 |
| MDH Invest AS | Borre | 2018 |
| MDL Consult AS | Oslo | 2017 |
| MDM Consultancy AS | Stavanger | 2022 |
| MDM Drilling Services S.R.L. | Ro-107535 Prahova County | 2021 |
| Mdmg AS | Oslo | 2016 |
| Mdo AS | Oslo | 2020 |
| Mdo Consulting AS | Oslo | 2023 |
| Mdsj AS | Fornebu | 2020 |