| Morar Gravesend Ltd | Health & social care | 2024 |
| Morar Hatfield Limited | Health & social care | 2016 |
| Morar Pagham Ltd | Health & social care | 2024 |
| Morar Preston Ltd | Health & social care | 2020 |
| Morar Preston PH2 Ltd | Real estate | 2023 |
| Morar Soham Ltd | Construction | 2019 |
| Morar Stowmarket Ltd | Health & social care | 2014 |
| Morar Uxbridge Ltd | Health & social care | 2024 |
| Morar Wimborne Ltd | Health & social care | 2025 |
| Moravia Europe Ltd | Wholesale & retail | 2015 |
| More Architecture Ltd | Professional & scientific | 2003 |
| More Bees Please Ltd | Manufacturing | 2019 |
| More Than Bricks Ltd | Real estate | 2022 |
| More Than Care Ltd | Health & social care | 2025 |
| More Than ED Ltd | Education | 2018 |
| Morefun Trading Ltd | Wholesale & retail | 2023 |
| Morenix Services Ltd | Administrative & support | 2025 |
| Moresburg Ltd | Professional & scientific | 2023 |
| Morethanacv Limited | Administrative & support | 2025 |
| Morfitt Smith Ltd | Real estate | 2013 |
| Morgan Hill Developments Limited | Real estate | 2000 |
| Morgan Hill Properties Limited | Real estate | 1996 |
| Morgan Lambert Electrical Limited | Professional & scientific | 2014 |
| Morgan Lambert Limited | Professional & scientific | 1997 |
| Morgan Wills & Estates Ltd | Professional & scientific | 2025 |
| Morgan's Wood-Fired Catering Ltd | Hospitality | 2018 |
| Morgs Online Limited | Health & social care | 2022 |
| Morgs Property Ltd | Real estate | 2024 |
| Morgz Ltd | Information & communication | 2016 |
| Morgzmum Ltd | Information & communication | 2018 |
| Morley Estates Limited | Real estate | 2017 |
| Morley Goulding VET Ltd | Professional & scientific | 2026 |
| Morley Power Investments Ltd | Financial services | 2025 |
| Morley Toxicology Ltd | Professional & scientific | 2018 |
| Morley Tree Maintenance Ltd | Administrative & support | 2026 |
| Morley's Fisheries Ltd | Wholesale & retail | 2010 |
| Morleys Meats Limited | Wholesale & retail | 2002 |
| Morning BAO Ltd | Hospitality | 2026 |
| Morning Delight Limited | Hospitality | 2024 |
| Moroccan Heritage Tours Ltd | Hospitality | 2024 |
| Morpeth II Limited | Real estate | 2005 |
| Morpheus IT Limited | Information & communication | 2016 |
| Morphing Strategies Limited | Professional & scientific | 2015 |
| Morri Consult Limited | Professional & scientific | 2005 |
| Morris & Daughters Limited | Manufacturing | 2010 |
| Morris & Morris Enterprises Limited | Real estate | 2008 |
| Morris 3 Productions Limited | Arts & recreation | 2024 |
| Morris Gardens Health Care Limited | Health & social care | 2025 |
| Morritone Ltd | Transport & logistics | 1999 |
| Morset Ltd | Information & communication | 2025 |
| Mortar Music Limited | Education | 2012 |
| Mortgage Advice Hub Ltd | Financial services | 2017 |
| Mortgage Base Limited | Financial services | 2016 |
| Mortgage Broker Directory Limited | Administrative & support | 2024 |
| Mortgage Clarity Ltd | Financial services | 2025 |
| Mortgage Results Limited | Financial services | 2005 |
| Mortgage Solutions (Wakefield) Ltd | Financial services | 2007 |
| Mortgageline Services UK Limited | Financial services | 2016 |
| Mortgagepa Ltd | Financial services | 2018 |
| Mortiman & Co Ltd | Households | 2021 |
| Mortomley Hall Property Management Limited | Households | 1985 |
| Mortomley Ltd | Households | 2023 |
| Morton Bradley Limited | Professional & scientific | 2016 |
| Morton Business Solutions Ltd | Information & communication | 2013 |
| Morton Works RTM Company Limited | Real estate | 2025 |
| MOS Aesthetics Ltd | Health & social care | 2024 |
| Mosborough Block Paving Limited | Construction | 2005 |
| Mosborough Construction Ltd | Construction | 2022 |
| Mosborough Construction Residential Limited | Construction | 2025 |
| Mosborough Healthcare Ltd | Wholesale & retail | 2019 |
| Mosborough Limited | Professional & scientific | 2011 |
| Mosborough Miners' Welfare Social Club Limited | Hospitality | 1998 |
| Mosborough Premier Build Limited | Construction | 2021 |
| Moscar Counselling Ltd | Health & social care | 2022 |
| Mosdorfer Rail Limited | Manufacturing | 2005 |
| Moses Eadon & Sons Ltd | Real estate | 2026 |
| Moseysf Ltd | Real estate | 2017 |
| Moshb Limited | Professional & scientific | 2023 |
| Mosley & Scott Ltd | Information & communication | 2026 |
| Mosley Holdings Limited | Professional & scientific | 2019 |
| Moss Hospitality Limited | Hospitality | 2025 |
| Moss House Court Management Company Limited | Professional & scientific | 2007 |
| Moss House Developments Ltd | Construction | 2006 |
| Moss Matrix Ltd | Wholesale & retail | 2023 |
| Moss Medical Limited | Health & social care | 2010 |
| Moss Valley Firewood Limited | Wholesale & retail | 2016 |
| Moss Valley Heating Ltd | Construction | 2021 |
| Mosshaus Ltd | Financial services | 2023 |
| Mostly Creative Ltd | Administrative & support | 2010 |
| MOT Medics Ltd | Wholesale & retail | 2023 |
| Motaryli Ltd | Transport & logistics | 2021 |
| Mother City Limited | Arts & recreation | 2003 |
| Mother of Pubs Ltd | Hospitality | 2024 |
| Mother Superior Ltd | Arts & recreation | 2012 |
| Motion Exercise CIC | Health & social care | 2022 |
| Motion Health Ltd | Health & social care | 2023 |
| Motionmusik Limited | Information & communication | 2024 |
| Motley SET Ltd | Construction | 2018 |
| Moto Motors Ltd | Wholesale & retail | 2024 |
| Moto-Trek Limited | Manufacturing | 2011 |