| MR Bubbles KP Ltd | Other services | 2026 |
| MR Clever Clean Peterborough Ltd | Administrative & support | 2018 |
| MR CNC Group Ltd | Professional & scientific | 2026 |
| MR Hyde Ltd | Administrative & support | 2017 |
| MR London Shopping Cart Ltd | Wholesale & retail | 2025 |
| MR Motorz Limited | Wholesale & retail | 2016 |
| MR Moverz Ltd | Transport & logistics | 2019 |
| MR Pizza 1 Limited | Hospitality | 2019 |
| MR Screen Ltd | Wholesale & retail | 2026 |
| MR Shine Ltd | Administrative & support | 2025 |
| MR Sparky Ltd | Construction | 2018 |
| MR W'S LAB Limited | Information & communication | 2016 |
| MR Whippy Soft Icecream Limited | Administrative & support | 2017 |
| MRH Holdings Limited | Health & social care | 2019 |
| Mrk-Ecom Ltd | Wholesale & retail | 2025 |
| MRL Consult Ltd | Information & communication | 2023 |
| MRR Consultants Ltd | Professional & scientific | 2025 |
| MRT IT Solutions Ltd | Information & communication | 2022 |
| MRT Retail Ltd | Wholesale & retail | 2021 |
| Mry.Transport Limited | Transport & logistics | 2024 |
| MS Autosales Ltd | Wholesale & retail | 2026 |
| MS Blue Edge Ltd | Wholesale & retail | 2025 |
| MS Blue Ltd | Professional & scientific | 2019 |
| MS Cars (Peterborough) Ltd | Wholesale & retail | 2023 |
| MS Design & Consultancy Ltd | Professional & scientific | 2018 |
| MS Divania Ltd | Manufacturing | 2025 |
| MS Family Ltd | Real estate | 2020 |
| MS Gorny Ltd | Transport & logistics | 2014 |
| MS Learning Academy Ltd | Education | 2025 |
| MS Logistics Cambs Ltd | Transport & logistics | 2021 |
| MS Optics Ltd | Health & social care | 2022 |
| MS Profit Ltd | Transport & logistics | 2017 |
| MS Raunds Limited | Real estate | 2018 |
| MS Swift Recovery & Transport Ltd | Transport & logistics | 2025 |
| MS UK Investments Ltd | Real estate | 2020 |
| MS Visas and Immigration Ltd | Professional & scientific | 2021 |
| Mscoachingeducation Ltd | Education | 2026 |
| MSI Cooling Ltd | Construction | 2015 |
| MSK72 Ltd | Real estate | 2002 |
| MSM Trans Ltd | Transport & logistics | 2017 |
| MSO Electricals Ltd | Construction | 2025 |
| Msons Trading Ltd | Wholesale & retail | 2025 |
| MSR Detailing Ltd | Administrative & support | 2021 |
| Msrs Property Ltd | Real estate | 2020 |
| MST Family Limited | Wholesale & retail | 2022 |
| MST Pathways Ltd | Education | 2025 |
| Mstav Ltd | Wholesale & retail | 2026 |
| Mstg Transport Ltd | Transport & logistics | 2021 |
| Msydee Limited | Hospitality | 2018 |
| MT Capital Management Limited | Financial services | 2012 |
| MT Flooring Ltd | Construction | 2011 |
| MT Hussain Properties Ltd | Real estate | 2016 |
| MT Interim Services Ltd | Professional & scientific | 2022 |
| MT Marco Ltd | Education | 2019 |
| MT Motors Ltd | Wholesale & retail | 2024 |
| MTE Bakes Ltd | Manufacturing | 2024 |
| Mth&Drs Ltd | Transport & logistics | 2025 |
| MTO Group Limited | Administrative & support | 2016 |
| MTX Trading Capital Investments Ltd | Financial services | 2025 |
| MU Fusion Ltd | Real estate | 2024 |
| MUA 786 Limited | Professional & scientific | 2015 |
| Mubaawara .Co Limited | Transport & logistics | 2024 |
| Mubarwe Limited | Public administration | 2024 |
| Muchii Homes Group Limited | Real estate | 2025 |
| Mudiwac Ltd | Health & social care | 2019 |
| Mughal Metal Fabrications Ltd. | Manufacturing | 2017 |
| MUH Investors Ltd | Real estate | 2024 |
| Muhammad Muneer Ltd | Wholesale & retail | 2025 |
| Muir Logitec Ltd | Wholesale & retail | 2025 |
| Mukoti Limited | Health & social care | 2016 |
| Mukthasolutions Limited | Information & communication | 2013 |
| Mulberry Builders Ltd | Construction | 2013 |
| Mulberry Gardens Management Company Limited | Households | 2001 |
| Mulliner Capital LLP | | 2024 |
| Multi FAB Metals Engineering EOT Trustees Limited | Manufacturing | 2025 |
| Multi Investments Limited | Extraterritorial | 2004 |
| Multi-Building Solutions Limited | Construction | 2010 |
| Multi-Tech Integrated Solutions UK Limited | Information & communication | 2012 |
| Multiclicks Solutions Limited | Wholesale & retail | 2019 |
| Multifab Metals Engineering Limited | Manufacturing | 2003 |
| Multilines Enterprises Ltd | Professional & scientific | 2025 |
| Multimoon Limited | Agriculture & fishing | 2000 |
| Multisea Limited | Hospitality | 2026 |
| Multisense Solutions Limited | Manufacturing | 2011 |
| Mumby Landscapes Limited | Construction | 2004 |
| Mumby Machinery Limited | Manufacturing | 2012 |
| Mums Sensations Ltd. | Hospitality | 2019 |
| Mumsy Ltd | Health & social care | 2023 |
| Mumtaz H Limited | Hospitality | 2019 |
| Muna Enterprises Ltd | Health & social care | 2012 |
| Munahid Properties Ltd | Real estate | 2021 |
| Munaz Limited | Wholesale & retail | 2021 |
| Munchbox W Ltd | Hospitality | 2021 |
| Mundra Solutions Limited | Wholesale & retail | 2009 |
| Munix Analytics Ltd | Information & communication | 2025 |
| Munk Management Limited | Professional & scientific | 2014 |
| Munny LK Property Services Ltd | Real estate | 2025 |
| Muntaz Foods Ltd | Hospitality | 2025 |
| Muraliswetha Properties Ltd | Real estate | 2023 |
| Murality Limited | Manufacturing | 2026 |