| Manuellterapeut Marianne Storberget AS | Ridabu | 2024 |
| Manuellterapeut Marit Klokset- Fysioterapi Og Treningsveiledning AS | Oppdal | 2020 |
| Manuellterapeut Mathilde Bakke AS | Otta | 2020 |
| Manuellterapeut Og Fysioterapeut Iversen AS | Randaberg | 2026 |
| Manuellterapeut Og Fysioterapeut Kristin Sjo-Nilsen AS | Heggedal | 2018 |
| Manuellterapeut Rune Holmgren AS | Nordfjordeid | 2015 |
| Manuellterapeut Ørjan Tveit AS | Kvernaland | 2025 |
| Manuellterapi AS | Heimdal | 2016 |
| Manuellterapi Og Ultralyd AS | Vestfossen | 2015 |
| Manuellterapi Svolvær AS | Svolvær | 2014 |
| Manuellterapiklinikken Brynseng SA | Oslo | 2008 |
| Maol Logopedi AS | Voss | 2023 |
| Mappeløs AS | Oslo | 2018 |
| Marco Pohl Fjord Dent AS | Etne | 2008 |
| Marcos AS | Steinkjer | 1995 |
| Mare Holding AS | Arendal | 2005 |
| Maren Kvalvaag AS | Kolbotn | 2023 |
| Maren Ladstein AS | Randaberg | 2022 |
| Maren Smedseng AS | Oslo | 2024 |
| Maren Tollagsen AS | Stavanger | 2025 |
| Maresante Mental Helse AS | Oslo | 2024 |
| Margareth Sandnes Holding AS | Vollen | 2024 |
| Margit Åkre Reite AS | Skien | 2022 |
| Margrete Solvang AS | Trondheim | 2026 |
| Mari Fiskvik Legekontor AS | Steinkjer | 2014 |
| Mari Køber Fysioterapi AS | Kristiansand S | 2021 |
| Mari Ruud AS | Flesberg | 2018 |
| Maria Helse Klinikk AS | Florø | 2019 |
| Mariadasan AS | Strømmen | 2012 |
| Marianker AS | Harstad | 2010 |
| Marianker Eiendom AS | Harstad | 2012 |
| Marianne Harling AS | Stavanger | 2021 |
| Marianne Ruud AS | Oslo | 2022 |
| Marianne's Fotterapi AS | Valderøya | 2026 |
| Maria`S Hud Og Fotterapi AS | Voss | 2026 |
| Marienlyst Legesenter Da | Oslo | 2013 |
| Marihen AS | Rådal | 2017 |
| Marihøne Protetikk AS | Erdal | 2026 |
| Marilyn Paula Therapy AS | Kleppe | 2021 |
| Marine & Safety Innovations Limited | Aberdeenshire Ab52 6Ra | 2014 |
| Marinor AS | Rypefjord | 1970 |
| Marion Reith AS | Aurskog | 2015 |
| Marit Aune AS | Fevik | 2020 |
| Marit Garberg Andvig AS | Oslo | 2015 |
| Marit Rekve AS | Rådal | 2018 |
| Marit Slåtten Fysio AS | Voss | 2025 |
| Marita Drift AS | Oslo | 1995 |
| Marita Mo Risøy Kiropraktikk, Helse Og Bevegelse AS | Trondheim | 2017 |
| Mariteam Helse AS | Follese | 2013 |
| Marits Fotterapi AS | Tromsø | 2015 |
| Marits Logopedtjenester AS | Ridabu | 2015 |
| Marius Eng AS | Moelv | 2025 |
| Markadoktorn AS | Oslo | 2012 |
| Markedet Legesenter Administrasjon AS | Haugesund | 2014 |
| Markeveien Fysioterapi Ans | Bergen | 2003 |
| Markku Karma AS | Oslo | 2013 |
| Markveien Helseklinikk AS | Oslo | 2022 |
| Markveien Legesenter AS | Oslo | 1996 |
| Marlene Karlsen Fysioterapi AS | Sandnessjøen | 2025 |
| Marlenes Fotklinikk AS | Herre | 2014 |
| Marnardal Legesenter Da | Marnardal | 2012 |
| Marstein Manuellterapi AS | Valderøya | 2025 |
| Marstein Psykologklinikk AS | Oslo | 2026 |
| Marstin AS | Holmestrand | 2024 |
| Marte Fønnebø Fysioterapi AS | Tromsø | 2023 |
| Martel Kompetanse AS | Strømmen | 2024 |
| Martes Fotterapi AS | Melhus | 2022 |
| Martin Fremstad AS | Porsgrunn | 2013 |
| Martin Lønning Invest AS | Mosterhamn | 2005 |
| Martine Riis Lindahl AS | Skallestad | 2022 |
| MARTINS1 Eiendom AS | Bøstad | 2019 |
| Martinsen Safe AS | Vollen | 2019 |
| Marzena Cicha Praktyka Lekarska | Pl-03-256 Warszawa | 2018 |
| Marøy Østensen Holding AS | Heimdal | 2025 |
| Mas Helse AS | Drammen | 2026 |
| Masa AS | Hamar | 2005 |
| Masala Milkshake AS | Drammen | 2013 |
| Massasje- Og Muskelterapeut Marion R Egenes AS | Kvinesdal | 2021 |
| Massasjeterapeut Trysil AS | Jordet | 2025 |
| Massørklinikken AS | Tønsberg | 2015 |
| Masterklinikken Norge AS | Oslo | 2014 |
| Mastermind Holding AS | Oslo | 2017 |
| Masterpoint Akupunktur Buvarp AS | Tønsberg | 2000 |
| Matador AS | Sandefjord | 2005 |
| Matenso AS | Oslo | 2021 |
| Mathesongården Legesenter AS | Trondheim | 2024 |
| Mathias Olaf Nome Thorvaldsen AS | Larvik | 2026 |
| Mathis Borthen AS | Oslo | 2021 |
| Mathisen Legetjenester AS | Halden | 2023 |
| Matic AS | Oslo | 2024 |
| Matro AS | Bergen | 2025 |
| Mats Pettersson Ortopedkonsult AB | Se-112 30 Stockholm | 2016 |
| Maturigo AS | Jar | 2012 |
| Maudbukta Legekontor AS | Vollen | 2013 |
| Maura Legesenter AS | Maura | 2016 |
| Mavima AS | Åsgårdstrand | 2015 |
| Max Fysio AS | Norddyrøy | 2021 |
| Max Venture AS | Hafrsfjord | 2005 |
| Maxi Fysioterapi AS | Sandnes | 2018 |
| Maxi Tannhelse AS | Sandnes | 2017 |