| Morespace Construction Group Ltd | Construction | 2024 |
| Morespace Garage Conversions Ltd | Construction | 2010 |
| Morestore Storage Ltd | Extraterritorial | 2011 |
| Morgan & Bradshaw Ltd | Wholesale & retail | 2025 |
| Morgan Peter Homes Ltd | Real estate | 2024 |
| Morgan's Global Marketplace Ltd | Wholesale & retail | 2024 |
| Morgan-Jenkins Limited | Health & social care | 2008 |
| Morgan’S Legacy Investments Ltd | Financial services | 2024 |
| Morgan’S Trade Network Ltd | Other services | 2024 |
| Morgarten Solutions Ltd | Professional & scientific | 2020 |
| Moriarty Property Services Ltd | Construction | 2022 |
| Morley Way Limited | Wholesale & retail | 2018 |
| Mormovement Ltd | Health & social care | 2024 |
| Morning Star Property Investments Ltd | Real estate | 2024 |
| Morningstar Medical Services Ltd | Health & social care | 2025 |
| Morris Interim Management Limited | Administrative & support | 2004 |
| Morris Media Ltd | Professional & scientific | 2024 |
| Morris Street Peterborough Ltd | Real estate | 2025 |
| Morsafe Limited | Administrative & support | 2004 |
| Morsim Ltd | Transport & logistics | 2018 |
| Mortal Saga Ltd | Wholesale & retail | 2026 |
| Mortar Construction Limited | Construction | 2025 |
| Mortgage With Jess Ltd | Financial services | 2025 |
| Mortimer A&T Limited | Manufacturing | 2020 |
| Morton-Scott Associates Limited | Extraterritorial | 2011 |
| Morza Construction Ltd | Construction | 2013 |
| MOS Trading Ltd | Wholesale & retail | 2017 |
| Mosaic Heaven Ltd | Wholesale & retail | 2009 |
| Mosaic People Ltd | Professional & scientific | 2016 |
| Moss-Off Ltd | Administrative & support | 2025 |
| Mossop Business Services Limited | Professional & scientific | 2017 |
| Mostert JAN Constructions Limited | Construction | 2026 |
| Mostyn Road Bushey Residents Company Limited | Households | 2011 |
| Mota & Sons Accountancy Ltd | Professional & scientific | 2017 |
| Mota & Sons Business and Tax Advisors Ltd | Professional & scientific | 2023 |
| Mota & Sons Consultancy Ltd | Professional & scientific | 2021 |
| Mothermary Limited | Health & social care | 2019 |
| Mothership Marine Limited | Manufacturing | 2016 |
| Motio Limited | Wholesale & retail | 2023 |
| Motion Active Sports Limited | Wholesale & retail | 2014 |
| Motion Autoworks Ltd. | Wholesale & retail | 2020 |
| Motiv Property Enterprise Ltd | Real estate | 2025 |
| Moto Broking Limited | Financial services | 2015 |
| Motor Bidco Limited | Financial services | 2025 |
| Motor Direct Peterborough Ltd | Wholesale & retail | 2025 |
| Motor Express (Peterborough) Ltd | Wholesale & retail | 2019 |
| Motor Giant (Peterborough) Ltd | Wholesale & retail | 2023 |
| Motor HUT Ltd | Wholesale & retail | 2016 |
| Motor Kingdom Limited | Wholesale & retail | 2024 |
| Motor Magnet Ltd | Wholesale & retail | 2023 |
| Motor Topco Limited | Financial services | 2025 |
| Motorbike Search Engine Limited | Wholesale & retail | 2007 |
| Motorbyj Ltd | Construction | 2023 |
| Motorchoice Ltd | Wholesale & retail | 2019 |
| Motorcrew Fengate Ltd | Wholesale & retail | 2020 |
| Motorworxuk Ltd | Wholesale & retail | 2023 |
| Motoryacht Services Limited | Manufacturing | 2008 |
| Moulton Land and Planning Ltd | Administrative & support | 2017 |
| Mount Gerizim Trust | Education | 2003 |
| Mount Moriah Tours Ltd | Administrative & support | 2025 |
| Mountain Office Solutions Ltd | Administrative & support | 2023 |
| Movad Housing Ltd | Real estate | 2022 |
| Move-On Care Limited | Health & social care | 2023 |
| Movi Financial Services Limited | Financial services | 2026 |
| Moviemy Ltd | Information & communication | 2024 |
| Movolytics Group Holdings Limited | Information & communication | 2021 |
| Movolytics Holdings Ltd | Financial services | 2016 |
| Movolytics Ltd | Information & communication | 2016 |
| MOW Medical Ltd | Health & social care | 2025 |
| Mowbray Indigo 157 Limited | Real estate | 2009 |
| Mowbray Indigo Limited | Health & social care | 2008 |
| MOY Maintenance Ltd | Construction | 2024 |
| Moynan Holdings Limited | Financial services | 2023 |
| Moyses Holdings Limited | Financial services | 2020 |
| Moznu UK Ltd | Real estate | 2020 |
| Mozopay Limited | Information & communication | 2026 |
| MP Engineering Site Management Limited | Manufacturing | 2025 |
| MP HCW Ltd | Other services | 2026 |
| MP Property Services Ltd | Construction | 2021 |
| MP Solar Solutions Ltd | Construction | 2026 |
| MP Window Cleaners Commercial Limited | Administrative & support | 2015 |
| Mp-Trans Ltd | Transport & logistics | 2019 |
| MPA Composites Ltd | Manufacturing | 2025 |
| MPA Transport Ltd | Transport & logistics | 2018 |
| MPF Engineering Services Ltd | Professional & scientific | 2018 |
| MPH Automotive Ltd | Wholesale & retail | 2013 |
| MPL Driving School Limited | Education | 2022 |
| MPP Animal Health Limited | Professional & scientific | 2025 |
| MPP Construction Services Ltd | Construction | 2018 |
| Mprutvi Limited | Hospitality | 2026 |
| MPS (DSJ) Ltd | Hospitality | 2019 |
| MPS (East Midlands) Limited | Real estate | 2006 |
| MPS Trans Limited | Administrative & support | 2017 |
| Mpsk Limited | Arts & recreation | 2010 |
| MPX Courier Ltd | Transport & logistics | 2020 |
| MQ EAT Ltd | Hospitality | 2025 |
| MQ Lounge Ltd | Hospitality | 2016 |
| MQ Nail Design Ltd | Other services | 2016 |
| MQ Products Ltd | Wholesale & retail | 2018 |
| MR Barrand & MR Barrand Ltd | Real estate | 2025 |