| Malt Court Limited | Hospitality | 2018 |
| Malta (U.K.) Limited | Real estate | 1993 |
| Maltavini Holdings Limited | Financial services | 2023 |
| Malthouse North Limited | Professional & scientific | 2023 |
| Maluch Express Ltd | Wholesale & retail | 2009 |
| Malum Investments LLP | | 2019 |
| Malus Investments Limited | Real estate | 1961 |
| Malvra Investments Limited | Real estate | 1958 |
| Malwa Investments Ltd | Real estate | 2018 |
| Malwa Limited | Other services | 2016 |
| Mam's Umbrella Ltd | Administrative & support | 2021 |
| Mama Delicious Ltd | Hospitality | 2013 |
| Mama K'S Limited | Wholesale & retail | 2011 |
| Maml Limited | Financial services | 2014 |
| Mamma V'S Ltd | Hospitality | 2015 |
| Mamozay Ltd | Hospitality | 2026 |
| Mamta Services Ltd | Professional & scientific | 2013 |
| Manage Home UK Ltd | Real estate | 2016 |
| Manage Limited | Administrative & support | 2000 |
| Manage My Practice Limited | Administrative & support | 2016 |
| Manage Your Accounts Ltd | Professional & scientific | 2021 |
| Management Hotels Ltd | Hospitality | 2023 |
| Managementuk Ltd | Real estate | 2017 |
| Managing Care Limited | Health & social care | 2009 |
| Manan Motors Ltd | Wholesale & retail | 2022 |
| Manandhar Property Ltd | Real estate | 2025 |
| Manchan Limited | Professional & scientific | 2012 |
| Manchester Surgery Ltd | Health & social care | 2021 |
| Manchesterhgc Limited | Health & social care | 2018 |
| Manda Pala Ltd | Information & communication | 2018 |
| Mandal Limited | Other services | 2025 |
| Mandalay Financial Limited | Financial services | 2007 |
| Mandalay Wealth Limited | Financial services | 2017 |
| Mandeeta Limited | Manufacturing | 2019 |
| Mandelstam Enterprises INT Ltd | Wholesale & retail | 2006 |
| Mandeville Dent Limited | Health & social care | 2024 |
| Mandeville Place (Freehold) Limited | Real estate | 1997 |
| Mandora by MD Ltd | Wholesale & retail | 2023 |
| Maneela Technology Ltd | Information & communication | 2016 |
| Manek Holdings Ltd | Real estate | 2018 |
| Manga Sekar Solutions Limited | Information & communication | 2019 |
| Mangher & Co Ltd | Administrative & support | 2017 |
| Mango and Mint PVT Ltd | Hospitality | 2023 |
| Mango and Peaches Limited | Information & communication | 2021 |
| Mango Junction Ltd | Real estate | 2025 |
| Mangwana Consultancy Ltd | Professional & scientific | 2023 |
| Manhar Wholesales Ltd | Wholesale & retail | 2009 |
| Manhir Enterprise Ltd | Transport & logistics | 2025 |
| Maniben Holdings Ltd | Financial services | 2024 |
| Manifest Cleaning Angels Ltd | Administrative & support | 2024 |
| Manimal Investments Limited | Administrative & support | 2017 |
| Manishayournutritionist Ltd | Wholesale & retail | 2022 |
| Manishree Logistics Limited | Wholesale & retail | 2015 |
| Maniza Care Ltd | Health & social care | 2025 |
| Manjusri Engineering Limited | Professional & scientific | 2016 |
| Manki Ltd | Wholesale & retail | 2017 |
| Manmade Handcrafted Furniture Limited | Other services | 2017 |
| Mann Investments London Limited | Real estate | 2006 |
| Manna Circle of Support UK Ltd | Health & social care | 2024 |
| Manna Properties Limited | Real estate | 1998 |
| Manna Seoul Limited | Hospitality | 2026 |
| Manor Court (Harrow) Residents Company Limited | Households | 1968 |
| Manor Enterprises Limited | Water & waste | 1981 |
| Manor Hall Property Limited | Real estate | 2017 |
| Manor Road House Management Company Limited | Administrative & support | 2001 |
| Manor Roofing & Guttering Ltd | Construction | 2019 |
| Manor Way Finance Ltd | Financial services | 2008 |
| Manorath Events Limited | Hospitality | 2025 |
| Manoshanti Ltd | Extraterritorial | 2014 |
| Manouri UK Ltd | Other services | 2021 |
| Manoush Express Limited | Hospitality | 2018 |
| Manpra Limited | Wholesale & retail | 2012 |
| Manpreet Direct Ltd | Wholesale & retail | 2022 |
| Manpt Property Investments Ltd | Real estate | 2022 |
| Manray Investment Ltd | Real estate | 2024 |
| Mans Media Sales Ltd | Professional & scientific | 2018 |
| Mansa Media Ltd | Information & communication | 2018 |
| Mansavi Foods Limited | Wholesale & retail | 2025 |
| Mansi Garden Centres Limited | Real estate | 1976 |
| MANSI07 Limited | Construction | 2025 |
| Mansila Property Ltd | Financial services | 2021 |
| Mansoor & Sons Limited | Transport & logistics | 2025 |
| Mansuk Contractor Ltd | Construction | 2024 |
| Mansv Limited | Households | 2010 |
| Mant Construction Ltd | Construction | 2017 |
| Manta Property Holdings Ltd | Real estate | 2024 |
| Mantra Holidays Limited | Administrative & support | 2021 |
| Mantrini Media Ltd | Professional & scientific | 2025 |
| Manty Studios Limited | Professional & scientific | 2021 |
| Manu & SAM Ltd | Construction | 2019 |
| Manu Design Limited | Professional & scientific | 2009 |
| Manu Haulage Ltd | Transport & logistics | 2018 |
| Manu Kumud Properties Limited | Real estate | 2022 |
| MANU101 Limited | Construction | 2017 |
| Manufacturers Supplies (Acton) Limited | Manufacturing | 1960 |
| Manufuture Ltd | Financial services | 2021 |
| MAP Accounting Limited | Professional & scientific | 2015 |
| MAP Investment Partners Limited | Real estate | 2020 |
| MAP Processing Systems Ltd | Transport & logistics | 2021 |
| MAP Property 1 Limited | Real estate | 2019 |