| Moore Commercial Services Ltd | Wholesale & retail | 2024 |
| Moore of York Limited | Wholesale & retail | 2013 |
| Moore's Property Solutions Ltd | Real estate | 2021 |
| Moores Quarter (Sittingbourne) Resident Management Company Limited | Households | 2025 |
| Moorfields (Dane Hill, Bradford) Management Company Limited | Households | 1998 |
| Moorgate View Management Company Limited | Real estate | 2018 |
| Moorland Paws Ltd | Agriculture & fishing | 2025 |
| Moorlands Walk (Sherburn) Management Company Limited | Real estate | 2019 |
| Moors Computer Services Limited | Information & communication | 2012 |
| Moors Cottages (NYM) Ltd | Real estate | 2023 |
| Moorside Developments Limited | Construction | 1997 |
| Moorside Farm Residential Management Company Limited | Real estate | 1996 |
| Moorside Holidays Ltd | Hospitality | 2021 |
| Moorside Mushrooms Ltd | Agriculture & fishing | 2023 |
| Moorsoft Ltd | Professional & scientific | 2007 |
| Moortech Ltd | Manufacturing | 2023 |
| Moorview Rescue Limited | Agriculture & fishing | 2012 |
| Moorwave Consulting Ltd | Professional & scientific | 2025 |
| Moorworth Hall Limited | Extraterritorial | 2026 |
| Moose Electricial Contractors Limited | Construction | 2024 |
| Mooza Ltd | Real estate | 2021 |
| Mora Kitchen Ltd | Hospitality | 2026 |
| Morasha Limited | Administrative & support | 2025 |
| Morbid MEL Limited | Health & social care | 2021 |
| More and Better Ltd | Professional & scientific | 2023 |
| Moreby Grange Farm Estates Limited | Hospitality | 2022 |
| Moretone Fitness LLP | | 2023 |
| Morf-Bio Ltd | Professional & scientific | 2025 |
| Morgan Bilton Associates Limited | Real estate | 2006 |
| Morgan Family Holdings Limited | Financial services | 2023 |
| Morgan Medley Limited | Construction | 2015 |
| Morgan Property Group UK Ltd | Construction | 2017 |
| Morki Gear Limited | Wholesale & retail | 2025 |
| Morlas Investments Limited | Extraterritorial | 2022 |
| Morley Colling Associates Limited | Professional & scientific | 2003 |
| Morning Coffee Afternoon Tea Limited | Hospitality | 2020 |
| Morning People Ltd | Manufacturing | 2025 |
| Morrell & Wilson Motors Ltd | Wholesale & retail | 2003 |
| Morrell Middleton Ltd | Professional & scientific | 2002 |
| Morrice and Company Limited | Professional & scientific | 1987 |
| Morris Group York Limited | Transport & logistics | 2024 |
| Morris-Lea Design Partnership Limited | Professional & scientific | 2004 |
| Morrison & Associates Legal Limited | Professional & scientific | 2025 |
| Morrison Legal Services Limited | Professional & scientific | 2025 |
| Mortec Developments Ltd | Construction | 2025 |
| Mortgage Gym Solutions Ltd. | Information & communication | 2020 |
| Mortgage Hall Limited | Financial services | 2012 |
| Mortie Limited | Professional & scientific | 2026 |
| Mortimer Engineering Services Limited | Professional & scientific | 2022 |
| Morton Lane Holdings Limited | Financial services | 2019 |
| Morton Lane One Limited | Real estate | 2019 |
| Morton Lane Three Limited | Real estate | 2019 |
| Morton Lane Two Limited | Real estate | 2019 |
| Morton Legal Limited | Professional & scientific | 2011 |
| Morton Legal Services Limited | Professional & scientific | 2016 |
| Morton Properties Limited | Construction | 2018 |
| Morton Training Limited | Education | 2016 |
| Morven Gray Ltd | Information & communication | 2026 |
| Morwick Green (Leeds) Management Company Limited | Households | 2025 |
| Mosaic Events Ltd | Administrative & support | 2003 |
| Mosaic Fulfilment Solutions Limited | Administrative & support | 2009 |
| Mosaic Specialist Manufacturing Limited | Professional & scientific | 2004 |
| Moshu Ltd | Arts & recreation | 2014 |
| Moss Properties Limited | Real estate | 2025 |
| Moss Tyres (Wetherby) Ltd | Wholesale & retail | 2019 |
| Moss Tyres (York) Limited | Wholesale & retail | 2011 |
| Moss Tyres Limited | Wholesale & retail | 1961 |
| Mossy Oaks LLP | | 2022 |
| Mossylane Property Limited | Real estate | 2017 |
| Most Developments Limited | Construction | 1987 |
| Most Wanted Event Solutions Limited | Construction | 2016 |
| Mostly Goose Limited | Wholesale & retail | 2020 |
| Mostyn Properties Ltd | Real estate | 2022 |
| MOT & Service Centre Tockwith Ltd | Wholesale & retail | 2010 |
| Motivational Therapy Ltd | Health & social care | 2012 |
| Motive Control Ltd | Information & communication | 2020 |
| Moto Shack Limited | Wholesale & retail | 2014 |
| Motoplex Ltd | Wholesale & retail | 2018 |
| Motor Trader Limited | Extraterritorial | 2009 |
| Motorbike.Co.Uk Ltd. | Information & communication | 2012 |
| Motorflex Ltd | Transport & logistics | 2021 |
| Motorhead-Aditud Ltd | Administrative & support | 2016 |
| Motto Pizza & Grill Ltd | Hospitality | 2023 |
| Mottosushi Ltd | Hospitality | 2024 |
| Moulsons Estates Ltd | Real estate | 2021 |
| Mount Court Management Company Limited | Households | 2002 |
| Mount Mews Limited | Real estate | 2025 |
| Mount Parade Limited | Construction | 2023 |
| Mount ROW Finance Limited | Extraterritorial | 1963 |
| Mount ROW Securities Limited | Extraterritorial | 1960 |
| Mount School York Development Limited | Real estate | 2024 |
| Mount Vale Management Company Limited | Households | 2017 |
| Mount Vale Venture LLP | | 2015 |
| Mountain Path Limited | Real estate | 2005 |
| Mountcroft Projects Ltd | Construction | 2024 |
| Move Fit Club Ltd | Arts & recreation | 2024 |
| Move OR Remove Limited | Transport & logistics | 2014 |
| Moventone Ltd | Health & social care | 2025 |
| Moverley Demolition & Skip Hire Limited | Construction | 2006 |
| Moving Events Ltd | Hospitality | 2016 |