| Mogal Trade Express Limited | Wholesale & retail | 2023 |
| Mohammad Consultancy Ltd | Information & communication | 2018 |
| Mohan Uppal Limited | Construction | 2026 |
| Mohanty Services Limited | Administrative & support | 2021 |
| Mohar Food & Wine Ltd | Wholesale & retail | 2024 |
| Mohasa Limited | Financial services | 2026 |
| Mohem Construction Ltd | Construction | 2024 |
| Mohsum Ltd | Wholesale & retail | 2023 |
| Moinia Limited | Wholesale & retail | 2025 |
| Mointech Ltd | Information & communication | 2026 |
| Moira Ltd | Professional & scientific | 2022 |
| Moiz BIN Asif Ltd | Wholesale & retail | 2026 |
| Mojja Bargains Ltd | Wholesale & retail | 2025 |
| Mojo Partners Ltd | Real estate | 2026 |
| Mojoe Coaching 110 Ltd | Administrative & support | 2024 |
| Momi Brothers Ltd | Construction | 2026 |
| Momo Camden Ltd | Real estate | 2025 |
| Momo's Farrington Ltd | Real estate | 2025 |
| Momoo Services Ltd | Information & communication | 2024 |
| Momos Camden Limited | Hospitality | 2025 |
| Monaka London Ltd | Wholesale & retail | 2025 |
| Monde Supertech Ltd | Wholesale & retail | 2024 |
| Mondido Care Limited | Health & social care | 2020 |
| Mondopay Ltd | Professional & scientific | 2021 |
| Money Save Mortgage Ltd | Financial services | 2023 |
| Moneypal Finance Limited | Financial services | 2015 |
| Monica J Ltd | Other services | 2017 |
| Monisha London Ltd. | Wholesale & retail | 2008 |
| Monschic Limited | Real estate | 2015 |
| Monster Remit Ltd | Financial services | 2018 |
| Montanna Development Group Ltd | Construction | 2017 |
| Monzi Mendhi Ltd | Other services | 2024 |
| Mooge Limited | Transport & logistics | 2014 |
| Moon Cart Ltd | Wholesale & retail | 2026 |
| Moon Safe Development Ltd | Information & communication | 2025 |
| Moon Stars Constructions Ltd | Construction | 2024 |
| Moondustfactory Limited | Professional & scientific | 2024 |
| Moonlight Haulage Ltd | Transport & logistics | 2021 |
| Moonlight House Ltd | Hospitality | 2023 |
| Moonlight Travel & Tourism Ltd | Transport & logistics | 2026 |
| Moonstone Transports Ltd | Transport & logistics | 2025 |
| Morden Design Kitchen & Bedrooms Limited | Manufacturing | 2024 |
| Morgan Company London Ltd | Administrative & support | 2025 |
| Morgans Traders Ltd | Other services | 2025 |
| Morika Ltd | Wholesale & retail | 2011 |
| Morlear Limited | Information & communication | 2026 |
| Morphware Ltd | Professional & scientific | 2024 |
| Mortgages and More Limited | Financial services | 2000 |
| Morvello Limited | Wholesale & retail | 2026 |
| Morvex Home Limited | Wholesale & retail | 2026 |
| Mosawi Ltd | Administrative & support | 2024 |
| Moss Gate Ltd | Real estate | 2026 |
| Most Wanted Properties Limited | Hospitality | 2025 |
| Motherline Distribution Ltd | Transport & logistics | 2025 |
| Mothers United Ltd | Other services | 2019 |
| Moto Tempo London Ltd | Wholesale & retail | 2016 |
| Motobex Limited | Wholesale & retail | 2010 |
| Motor Masters (Hayes) Limited | Wholesale & retail | 2013 |
| Motor on Road Ltd | Wholesale & retail | 2026 |
| Motor Service Centre Ltd | Wholesale & retail | 1979 |
| Motoro Digital Ltd | Wholesale & retail | 2026 |
| Mountbatten Developments Ltd | Real estate | 2023 |
| Mountview (Ealing) Limited | Households | 1984 |
| MOV1NG Ltd | Transport & logistics | 2025 |
| Movables & Suites Services Ltd | Wholesale & retail | 2018 |
| Move Reality Limited | Real estate | 2025 |
| Movo Designers Ltd | Manufacturing | 2019 |
| Moyo Healthcare Ltd | Health & social care | 2021 |
| Mploid Ltd | Administrative & support | 2023 |
| Mpvd Limited | Health & social care | 2021 |
| MR NAV Ltd | Wholesale & retail | 2023 |
| MR Rory Kinsella Ltd | Transport & logistics | 2007 |
| MR ROY Jerk Chicken Limited | Hospitality | 2022 |
| MR Singh Enterprise Ltd | Wholesale & retail | 2023 |
| MR Singh Properties Ltd | Real estate | 2018 |
| MR Singh Stores Ltd | Wholesale & retail | 2015 |
| MR Singh Transport Ltd | Transport & logistics | 2024 |
| MR Singh's Carpet London Limited | Wholesale & retail | 2021 |
| MR Telecom UK Ltd | Administrative & support | 2017 |
| MR Thali Limited | Hospitality | 2025 |
| MR. Ayaz Signature Ltd | Wholesale & retail | 2024 |
| MRN Trader Limited | Wholesale & retail | 2019 |
| MRS P K Dhillon Ltd | Professional & scientific | 2025 |
| MS 1 Tyres UK Ltd | Wholesale & retail | 2022 |
| MS Buildwell Limited | Construction | 2023 |
| MS Commercial Dwellings Ltd | Real estate | 2025 |
| MS Construtction Limited | Construction | 2016 |
| MS Dhanoa Limited | Construction | 2026 |
| MS Dwellings Ltd | Real estate | 2021 |
| MS GUL Limited | Wholesale & retail | 2025 |
| MS Josan Construction Ltd | Construction | 2023 |
| MS Soni Ltd | Wholesale & retail | 2026 |
| MS Thind Limited | Construction | 2018 |
| MS Trade Group Ltd | Wholesale & retail | 2026 |
| MS17 Ltd | Hospitality | 2025 |
| MSB Taxation Services Ltd | Professional & scientific | 2014 |
| MSC Asset Management Limited | Real estate | 2021 |
| MSC Legal Services Limited | Professional & scientific | 2017 |
| MSE Capital Ltd | Professional & scientific | 2025 |
| Mshd Ltd | Professional & scientific | 2012 |