| Murray Hill Developments Limited | Real estate | 2004 |
| Murton Fabrics-York Limited | Wholesale & retail | 2021 |
| Murton Grange Limited | Agriculture & fishing | 1997 |
| Murton Holdings Limited | Financial services | 2026 |
| Murton Midco Limited | Financial services | 2026 |
| Muse York Ltd | Professional & scientific | 2024 |
| Museum Street Consultancy Limited | Construction | 2018 |
| Mushroom Producer Organisation Limited | Agriculture & fishing | 2016 |
| Music and Sound Design Limited | Information & communication | 2009 |
| Music Box (York) Ltd | Information & communication | 2024 |
| Music for Sport Limited | Information & communication | 2012 |
| Music in Every Room Ltd | Wholesale & retail | 2006 |
| Musical Memories CIC | Arts & recreation | 2016 |
| Musnom Limited | Professional & scientific | 2004 |
| Mustard Pizza Limited | Hospitality | 2026 |
| Mutex Ltd. | Manufacturing | 1998 |
| Mutual Consultants Limited | Professional & scientific | 1991 |
| Muves Ltd | Construction | 2015 |
| Muzer Ltd | Information & communication | 2025 |
| MVC Consultants Limited | Financial services | 2021 |
| MVC Property Holdings Limited | Real estate | 2022 |
| MVG Yorkshire Limited | Financial services | 2025 |
| MVM Bank Limited | Professional & scientific | 2005 |
| Mvno Partners Limited | Information & communication | 2005 |
| MVP Travel Limited | Administrative & support | 2016 |
| MW Digital Yorkshire Ltd | Professional & scientific | 2018 |
| MW Electrical Services Limited | Construction | 2001 |
| MW Engineering Solutions Limited | Professional & scientific | 2013 |
| MW Fitness Centre Ltd | Arts & recreation | 2023 |
| MW Garage JPN Ltd | Wholesale & retail | 2025 |
| MW Garage JPN NY Ltd | Wholesale & retail | 2026 |
| MW Motive Limited | Wholesale & retail | 2025 |
| MW Prestige Imports Ltd | Wholesale & retail | 2023 |
| MW Scarborough Limited | Real estate | 2023 |
| MW Seven Spices Ltd | Hospitality | 2026 |
| Mwallwork Ltd | Hospitality | 2025 |
| MWM Limited | Financial services | 2009 |
| Mwmp Sports Limited | Arts & recreation | 2023 |
| MWW Consulting Limited | Professional & scientific | 2018 |
| Mwwtrg&Dev Ltd | Other services | 2006 |
| Mxtalent Ltd | Administrative & support | 2026 |
| My Bright Moves Limited | Administrative & support | 2020 |
| My Fitness and Martial Arts Ltd | Arts & recreation | 2018 |
| My Four Wheels Ltd | Administrative & support | 2017 |
| My Holistic Bliss Ltd | Other services | 2017 |
| My Home Entertainment Ltd | Wholesale & retail | 2015 |
| My House Removals Limited | Transport & logistics | 2023 |
| My HSE Manager Ltd | Information & communication | 2020 |
| My Jewellery Story Ltd | Wholesale & retail | 2019 |
| My Life BUT Greener Limited | Manufacturing | 2013 |
| My Mirchiz Limited | Hospitality | 2023 |
| My Pixel Paint Ltd | Information & communication | 2024 |
| My Yoga Journey Ltd | Arts & recreation | 2016 |
| My-Bathrooms Yorkshire.Co.Uk Limited | Construction | 2012 |
| MYA Consultation Limited | Health & social care | 2025 |
| Mycospace Limited | Administrative & support | 2019 |
| Mycruisegame Ltd | Information & communication | 2025 |
| Myers Hastings Limited | Manufacturing | 2024 |
| Myerscough Farm Vets Limited | Extraterritorial | 2009 |
| Mygeo Limited | Information & communication | 2019 |
| Myknowledgemap Limited | Information & communication | 2000 |
| Myprop Ltd | Real estate | 2017 |
| Myrtle House Investments Limited | Real estate | 2017 |
| Myse Hovingham Limited | Hospitality | 2016 |
| Mythophonic Limited | Professional & scientific | 2006 |
| Mythos Enterprises Limited | Financial services | 2016 |
| Myton Hall Farms Limited | Agriculture & fishing | 2017 |
| Mytoolexpert Limited | Wholesale & retail | 2021 |
| Mytrophyroom Limited | Arts & recreation | 2025 |
| MZ Private Limited | Wholesale & retail | 2023 |
| N & H Whieldon Limited | Professional & scientific | 2011 |
| N & J Wraith Holdings Limited | Financial services | 2024 |
| N & PB Construction Ltd | Construction | 2019 |
| N & R Engineering Ltd | Wholesale & retail | 2014 |
| N Baker Holdings Limited | Financial services | 2026 |
| N Colours Limited | Wholesale & retail | 2024 |
| N G Plant Hire Ltd | Construction | 2009 |
| N H Consultants Ltd | Professional & scientific | 2015 |
| N Jagger Limited | Construction | 2015 |
| N M Atton Ltd | Professional & scientific | 2005 |
| N R Shortland Consulting Limited | Professional & scientific | 2011 |
| N Smith Holdings Limited | Financial services | 2014 |
| N Watson Developments Limited | Construction | 2001 |
| N&B Livestock Ltd | Wholesale & retail | 2026 |
| N&L Consult Ltd | Mining & quarrying | 2025 |
| N. Minikin & Sons Limited | Manufacturing | 1978 |
| N.A. Hunter Limited | Real estate | 2015 |
| N.B Tech Ltd | Wholesale & retail | 2025 |
| N.B.A. H.R. Services Limited | Administrative & support | 2004 |
| N.H.J Developments Ltd | Real estate | 2023 |
| N.Hashimi Ltd | Professional & scientific | 2025 |
| N.M. Smiles Ltd | Health & social care | 2022 |
| NA Signalling Limited | Professional & scientific | 2018 |
| Naburn Caravan Park Limited | Hospitality | 2019 |
| Naburn Grange SKI Club Limited | Arts & recreation | 2019 |
| Naburn Moor Limited | Agriculture & fishing | 2016 |
| Nadine Murrell Travel Ltd | Administrative & support | 2025 |
| Nail Bar One Limited | Other services | 2000 |
| Naish Estate Agents Limited | Real estate | 2021 |
| Names Technical Services Limited | Information & communication | 2015 |