| Mount Park Sutherland Road Ltd | Real estate | 2019 |
| Mount Urgull Partners Ltd | Financial services | 2018 |
| Mount Zion Ltd | Administrative & support | 2024 |
| Mountains From Molehills Ltd | Professional & scientific | 2023 |
| Mounthawk Properties Ltd | Real estate | 2021 |
| Mountview Inc Ltd | Education | 2019 |
| Mouvin Limited | Administrative & support | 2009 |
| Move One Limited | Transport & logistics | 2020 |
| Movein Property Co Limited | Real estate | 2025 |
| Movewell Properties Ltd | Real estate | 2021 |
| Movies in Motion Ltd | Transport & logistics | 2015 |
| Moving to UAE Events Ltd | Administrative & support | 2024 |
| Movlee Technologies Ltd | Information & communication | 2020 |
| Mowhawk Holdings Limited | Professional & scientific | 2003 |
| Moxa UK Limited | Professional & scientific | 2015 |
| Moxie Marketing Group Ltd | Administrative & support | 2022 |
| Mo’S Holding Ltd | Financial services | 2023 |
| Mo’S Stonex Ltd | Manufacturing | 2022 |
| MP Fast Brickwork Contractors Ltd | Administrative & support | 2025 |
| MP Samuels Limited | Financial services | 2014 |
| MPC Training Ltd | Professional & scientific | 2026 |
| Mpcs-It Limited | Information & communication | 2011 |
| MPG Group Consulting Limited | Professional & scientific | 2016 |
| MPG Quantity Surveyors Limited | Professional & scientific | 2010 |
| MPS Building Services Ltd | Construction | 2021 |
| MPS Property Investments Limited | Real estate | 2023 |
| MR Kater Ltd | Hospitality | 2024 |
| MR Potato and MRS Pizza Ltd | Hospitality | 2021 |
| MR Purple Limited | Wholesale & retail | 2018 |
| MR Scissors Ltd | Other services | 2024 |
| MR Smith ION Dumitrascu Ltd | Construction | 2015 |
| MR Whippy Watford Ltd | Wholesale & retail | 2026 |
| Mr.Body Limited | Wholesale & retail | 2013 |
| MRA (UK) Ltd | Administrative & support | 2014 |
| MRG Consultants Ltd | Professional & scientific | 2017 |
| MRJ and Co Trading AS Silverbirch Northwood Ltd | Professional & scientific | 2002 |
| MRJL4TP (IOW) Limited | Real estate | 2019 |
| MRP Sixty Ltd | Professional & scientific | 2017 |
| Mrsb Property Investments Limited | Real estate | 2015 |
| MRY Future Organisation Ltd | Health & social care | 2018 |
| MS & HS Services Ltd | Professional & scientific | 2022 |
| MS Apple Ltd | Arts & recreation | 2025 |
| MS Canvas & PVC Limited | Other services | 2002 |
| MS Fibre Service Ltd | Information & communication | 2023 |
| MS Growth Consulting Ltd | Professional & scientific | 2025 |
| MS Innovations Limited | Other services | 2014 |
| MS IT Practices Ltd | Information & communication | 2024 |
| MS Pharmacovigilance Ltd | Professional & scientific | 2024 |
| MS Property Management Limited | Real estate | 2024 |
| Ms&H Prime Ltd | Wholesale & retail | 2026 |
| MS88 Services Ltd | Administrative & support | 2016 |
| MSA Consultancy Limited | Professional & scientific | 2005 |
| Msbyb Properties Ltd | Administrative & support | 2023 |
| MSC IT Contracting Ltd | Information & communication | 2019 |
| Msfh Solutions Limited | Wholesale & retail | 2019 |
| Msha Global Investments Limited | Real estate | 2017 |
| MSI Integrated Services Limited | Administrative & support | 2021 |
| MSI London Ltd | Wholesale & retail | 2026 |
| MSK Accounting and Financial Consultancy Ltd | Professional & scientific | 2018 |
| MSK Wills and Estate Consultancy Ltd | Professional & scientific | 2019 |
| MSM Investment Group Limited | Professional & scientific | 2016 |
| MSN Imperial Gateway Ltd | Wholesale & retail | 2025 |
| Msnk Holdings Ltd | Financial services | 2022 |
| MSP Energy Consultant Limited | Administrative & support | 2008 |
| MSP Health Care Ltd | Wholesale & retail | 2021 |
| Msrh Ltd | Real estate | 2025 |
| MSS Infrastructure Limited | Administrative & support | 2011 |
| Mssi Group Limited | Administrative & support | 2016 |
| MST200 Limited | Professional & scientific | 2012 |
| MSZ Group Ltd | Wholesale & retail | 2024 |
| MT & MD Healthcare Ltd | Health & social care | 2022 |
| MT Painting Ltd | Construction | 2026 |
| MT Washington Ltd | Information & communication | 2017 |
| MTB Consulting Solutions Ltd | Professional & scientific | 2017 |
| MTB Marketing Ltd | Professional & scientific | 2026 |
| Mtbs Construction Ltd | Construction | 2017 |
| MTF General Trading Ltd | Wholesale & retail | 2025 |
| Mthara Ltd | Wholesale & retail | 2024 |
| MTI Aerospace Limited | Administrative & support | 2004 |
| Mtk-Food Ltd | Extraterritorial | 2021 |
| MTN IT Limited | Extraterritorial | 2011 |
| MTR Metals Ltd | Administrative & support | 2022 |
| Mtwise Ltd | Health & social care | 2021 |
| Much Solutions Ltd. | Information & communication | 2015 |
| Mucheco Limited | Information & communication | 2022 |
| Mudra Dance Academy Limited | Education | 2024 |
| MUH Rizw Ltd | Wholesale & retail | 2025 |
| Muir Financial Consulting Ltd | Professional & scientific | 2026 |
| Muirfields Homes Ltd | Construction | 2018 |
| MUK Logistics Ltd | Transport & logistics | 2024 |
| Mulkerrins Development UK Ltd | Construction | 2025 |
| Mullen EWI Limited | Construction | 2013 |
| Multi 'N' Food Limited | Wholesale & retail | 2010 |
| Multifaceted Web Services Ltd | Information & communication | 2011 |
| Multimension Ltd | Information & communication | 2010 |
| Multitrades Windows and Doors Limited | Manufacturing | 2012 |
| Multsec Ltd | Administrative & support | 2026 |
| Mumbai Fusion Catering Ltd | Hospitality | 2021 |
| Mumbai MIX & Partners LLP | | 2018 |
| MUMBAI49 Limited | Administrative & support | 2016 |