| MMN Trading Ltd | Wholesale & retail | 2026 |
| MMO & Partners Ltd. | Professional & scientific | 2020 |
| MMR C Solutions Ltd | Information & communication | 2020 |
| MMS Eco Grants Service Ltd | Information & communication | 2020 |
| MMS Sales and Letting Ltd | Real estate | 2021 |
| MMS Security Ltd | Administrative & support | 2023 |
| MMS Services Ltd | Construction | 2026 |
| Mmshmk Limited | Real estate | 2025 |
| MMT Property Group Ltd | Households | 2024 |
| Mmtajar Ltd | Wholesale & retail | 2023 |
| MMV Services Ltd | Construction | 2021 |
| Mmym Limited | Other services | 2025 |
| MN Executive Properties Ltd | Real estate | 2025 |
| MN Services Luton Limited | Financial services | 2020 |
| MNA Buildings Limited | Real estate | 2019 |
| Mnazha Holdings Ltd | Financial services | 2022 |
| MND Transport Limited | Transport & logistics | 2014 |
| MNF Law Ltd | Other services | 2025 |
| MNH Bazaar Ltd | Wholesale & retail | 2024 |
| Mnib UK Ltd | Transport & logistics | 2021 |
| MNK Intl UK Limited | Wholesale & retail | 2025 |
| MNL 88 Ltd | Hospitality | 2017 |
| MNM Smiles Ltd | Health & social care | 2026 |
| MNS Investments Limited | Real estate | 2024 |
| MNS Prosperity Ltd | Health & social care | 2026 |
| MNS Services Luton Limited | Wholesale & retail | 2020 |
| MNT Northampton Ltd | Real estate | 2022 |
| MO Bargains Limited | Wholesale & retail | 2026 |
| Mo's Peri Peri and Pizza Limited | Hospitality | 2023 |
| Mo-Tintin Limited | Professional & scientific | 2011 |
| Mo:Dus Systems Limited | Information & communication | 2019 |
| Moado Limited | Construction | 2022 |
| MOB Boss Cleaning Services Limited | Administrative & support | 2025 |
| Mobal Solutions Ltd | Wholesale & retail | 2013 |
| Mobd Limited | Construction | 2025 |
| Mobetolas Ltd | Wholesale & retail | 2025 |
| Mobia Properties Ltd | Real estate | 2025 |
| Mobicad Limited | Professional & scientific | 2015 |
| Mobicoms Electronics Ltd | Wholesale & retail | 2019 |
| Mobile Finance Experts LLP | | 2015 |
| Mobile Fleet Care Ltd | Wholesale & retail | 2026 |
| Mobile Fleet Support Ltd | Wholesale & retail | 2006 |
| Mobile Food Shack Ltd | Hospitality | 2024 |
| Mobile Partner Enterprises Ltd | Wholesale & retail | 2014 |
| Mocare Limited | Health & social care | 2019 |
| Moczulski Logistics Ltd | Transport & logistics | 2015 |
| MOD Surveying & Civils Ltd | Construction | 2025 |
| Moda Affair Ltd | Other services | 2026 |
| Moda Mven Co Limited | Wholesale & retail | 2025 |
| Modal Innovation Limited | Wholesale & retail | 2016 |
| Model Investment Ltd | Real estate | 2024 |
| Modelling for Advantage Ltd | Wholesale & retail | 2021 |
| Modern Muse Aesthetics Ltd | Other services | 2026 |
| Moderneer Limited | Information & communication | 2025 |
| Moderno Living Ltd | Wholesale & retail | 2019 |
| Modest Street Limited | Professional & scientific | 2020 |
| Modestly Yours Ltd | Wholesale & retail | 2025 |
| Modesty Allied Services Limited | Wholesale & retail | 2016 |
| Modre International Trading Ltd | Transport & logistics | 2023 |
| Modular Housing Solutions Limited | Manufacturing | 2017 |
| Modus Body Repairs Limited | Wholesale & retail | 2016 |
| Modus Global Limited | Wholesale & retail | 2024 |
| Modxhome Limited | Information & communication | 2025 |
| Moeen Enterprises Ltd | Wholesale & retail | 2023 |
| Moeez Imran & Co Limited | Professional & scientific | 2015 |
| Moeid Trading UK Ltd | Administrative & support | 2025 |
| Moems Technologies Ltd | Wholesale & retail | 2026 |
| Mohammed Abdur Rahman Services Ltd | Transport & logistics | 2022 |
| Mohammed Ahad Ltd | Transport & logistics | 2022 |
| Mohammed Property Limited | Real estate | 2025 |
| Mohan'Z FIN Nest Limited | Wholesale & retail | 2015 |
| Mohyuddin Consultancy Limited | Health & social care | 2025 |
| Mohyuddin Properties Ltd | Real estate | 2026 |
| Moise Transport Limited | Transport & logistics | 2025 |
| Moist Loaf Ltd | Manufacturing | 2026 |
| MOJ Jewellery & Fashion Ltd | Wholesale & retail | 2025 |
| Mojnu Cleaning Ltd | Administrative & support | 2024 |
| Mojo Tech Services Ltd | Information & communication | 2018 |
| Mojos Properties Ltd | Real estate | 2024 |
| Mold Ltd | Construction | 2025 |
| Moldovaluton Limited | Wholesale & retail | 2020 |
| Moldovan Constructions Ltd | Construction | 2020 |
| Molla&Co UK Ltd | Hospitality | 2019 |
| Molvi Properties Limited | Real estate | 2016 |
| Moma Estate UK Ltd | Real estate | 2023 |
| Momento 2024 Limited | Hospitality | 2024 |
| Momento London Limited | Wholesale & retail | 2017 |
| Momentous Logistics Limited | Other services | 2016 |
| Momentum Construction Management Limited | Construction | 2024 |
| Momentum Energy Solutions Limited | Real estate | 2017 |
| Momnaz Ltd | Wholesale & retail | 2025 |
| Mona Accountants Ltd | Professional & scientific | 2018 |
| Monaghan Decorators Ltd | Construction | 2026 |
| Monal Foods Ltd | Hospitality | 2024 |
| Mondi Private Construction Ltd | Construction | 2014 |
| Moneyway Group Limited | Real estate | 2019 |
| Monfredex Ltd | Real estate | 2025 |
| Mongia Autocare Ltd | Wholesale & retail | 2025 |
| Monks Meadow LOC Limited | Construction | 2025 |
| Monodromy Ltd | Information & communication | 2026 |