| Mortgage Force (UK) Ltd | Financial services | 2015 |
| Mortgage Force Limited | Financial services | 2000 |
| Mortgage Guru Ltd | Financial services | 2013 |
| Mortgage Rapport Limited | Financial services | 2004 |
| Mortgage Social Pro Limited | Information & communication | 2005 |
| Mortgage Talk (Partnership) Limited | Extraterritorial | 2010 |
| Mortgage Talk Ltd. | Financial services | 1998 |
| Morwood Properties Limited | Financial services | 2021 |
| Morwood Property Solutions Ltd | Real estate | 2017 |
| MOS Incorporated Limited | Real estate | 2015 |
| MOS Parmos Ltd | Hospitality | 2026 |
| Moseley Services Ltd | Construction | 2023 |
| Mosh Derby Ltd | Hospitality | 2006 |
| Mosley Mode Ltd | Wholesale & retail | 2026 |
| Moss Matters Ltd | Wholesale & retail | 2026 |
| Mostearn Limited | Information & communication | 1990 |
| Mostyn Trading Limited | Wholesale & retail | 2024 |
| MOT Excellence Ltd | Wholesale & retail | 2026 |
| Motek Derby Ltd | Wholesale & retail | 2009 |
| Motevalli Financials Ltd | Financial services | 2026 |
| Motherson Transport Limited | Transport & logistics | 2025 |
| Motion Digital Limited | Wholesale & retail | 2003 |
| Motion Framework Derby Ltd | Information & communication | 2013 |
| Motion Intelligence Limited | Professional & scientific | 2024 |
| Motivational Athlete Ltd | Arts & recreation | 2023 |
| Motivational Interviewing and Safeguarding Training Limited | Education | 2024 |
| Motivus Consulting Limited | Professional & scientific | 2013 |
| Motoloko Limited | Manufacturing | 2019 |
| Motoloko Trading Ltd | Wholesale & retail | 2022 |
| Motor Solutions Sales Ltd | Wholesale & retail | 2016 |
| Motor Sorted Limited | Wholesale & retail | 2025 |
| Motor Summit Ltd | Wholesale & retail | 2025 |
| Motor Wurks Ltd | Wholesale & retail | 2018 |
| Motorbay Limited | Wholesale & retail | 2025 |
| Motordrive Derby Limited | Wholesale & retail | 2024 |
| Motorluxe Styling Ltd | Wholesale & retail | 2024 |
| Motorpoint Group PLC | Wholesale & retail | 2016 |
| Motorpoint Limited | Wholesale & retail | 1997 |
| Motorraya Ltd | Wholesale & retail | 2026 |
| Motors Lane Ltd | Wholesale & retail | 2025 |
| Motorsource Trade Limited | Wholesale & retail | 2021 |
| Motorsport Events Solutions Limited | Arts & recreation | 2018 |
| Motorsport Metallic Components (MMC) Ltd | Professional & scientific | 2025 |
| Motorvated Ltd | Wholesale & retail | 2020 |
| Motorzoo Ltd | Wholesale & retail | 2024 |
| Mottishaw Construction Safety Training Limited | Education | 2002 |
| Mount Cook Activity Limited | Health & social care | 2014 |
| Mount Cook Property Limited | Financial services | 2014 |
| Mount Pleasant Garden Rooms Ltd | Construction | 2025 |
| Mount Pleasant Natural Pools Ltd | Construction | 2025 |
| Mountberry Properties Ltd | Real estate | 2025 |
| Mountfield Financial Services Limited | Financial services | 2008 |
| Mountney Property Services Ltd | Construction | 2024 |
| Moure Logistics Ltd | Transport & logistics | 2026 |
| Moussa Trading Ltd | Hospitality | 2024 |
| Moussatogroup Ltd | Construction | 2025 |
| Move for Wellbeing Ltd | Health & social care | 2023 |
| Move Right Holdings Ltd | Financial services | 2020 |
| Move Right Housing Ltd | Real estate | 2020 |
| Move Right Therapies Ltd | Health & social care | 2020 |
| MOVE2AGILE Limited | Information & communication | 2016 |
| Movement-Iq Ltd | Professional & scientific | 2019 |
| Movi Limited | Health & social care | 2010 |
| Movie Concession UK Limited | Transport & logistics | 2003 |
| Moviemaze Limited | Information & communication | 2013 |
| Moxntxis Ltd | Transport & logistics | 2026 |
| Moxon Properties Ltd | Real estate | 2025 |
| Mozu Ltd | Real estate | 2024 |
| Mo’S Barber (Derby) Limited | Other services | 2022 |
| MP Agricultural Ltd | Manufacturing | 2024 |
| MP Recycling Group Limited | Wholesale & retail | 2024 |
| MP Recycling Limited | Wholesale & retail | 2020 |
| MP Scientific and Technical Limited | Professional & scientific | 2018 |
| MP Venture Properties Limited | Real estate | 2017 |
| MPC Group LLP | | 2021 |
| MPG Group Holdings Limited | Financial services | 2026 |
| MPG Hire Ltd | Administrative & support | 2023 |
| Mpowerd Solutions Limited | Professional & scientific | 2017 |
| Mprc Limited | Wholesale & retail | 2018 |
| MPS Group Services Ltd | Construction | 2022 |
| MPS Tech Services Ltd | Construction | 2020 |
| Mps-Multiple Prime Solutions Ltd | Information & communication | 2019 |
| Mptheatricals Ltd | Arts & recreation | 2020 |
| MPW Management Services Limited | Information & communication | 2017 |
| MPW Property Management Limited | Real estate | 2019 |
| MQ Optical Ltd | Health & social care | 2026 |
| Mqac Ltd | Transport & logistics | 2026 |
| MR 46 Ltd | Financial services | 2023 |
| MR AJ Limited | Wholesale & retail | 2025 |
| MR and MRS Property Ltd | Hospitality | 2023 |
| MR and MRS Smith Holdings Limited | Financial services | 2023 |
| MR and MRS Smith Investments Ltd | Real estate | 2024 |
| MR and MRS Smith Properties Ltd | Real estate | 2019 |
| MR Blackharry Limited | Hospitality | 2018 |
| MR Booze Derby Ltd | Wholesale & retail | 2024 |
| MR Booze Express Limited | Wholesale & retail | 2017 |
| MR Booze Midlands Limited | Wholesale & retail | 2022 |
| MR Christmas Tree Limited | Wholesale & retail | 2013 |
| MR Corporate Services Ltd | Construction | 2024 |
| MR H Cornishman Limited | Hospitality | 2017 |