| Mankiewicz UK LLP | | 2011 |
| Mankiewicz UK Management Limited | Financial services | 2017 |
| Mankirat Construction Limited | Construction | 2020 |
| Manku Bros Pizza Co Ltd. | Hospitality | 2018 |
| Manley Electrical Solutions Ltd | Construction | 2025 |
| Manley Watts Electrical Limited | Construction | 2025 |
| Manluck Ltd | Hospitality | 2021 |
| Manly Company Limited | Construction | 1995 |
| Manmai Properties Ltd | Real estate | 2026 |
| Manmit Transport Limited | Transport & logistics | 2025 |
| Mann Electrical Construction Ltd | Construction | 2023 |
| Mann Food & Wine Limited | Extraterritorial | 2016 |
| Mann Motors Limited | Wholesale & retail | 2012 |
| Mann Transport Services Ltd | Transport & logistics | 2016 |
| Mannat Transport Ltd | Transport & logistics | 2018 |
| Mannaya Consulting Ltd | Administrative & support | 2011 |
| Mannaya Ltd | Professional & scientific | 2011 |
| Manne Design Limited | Professional & scientific | 2025 |
| Mannie Limited | Administrative & support | 2017 |
| Mannix Brothers Storage & Piano Moves Ltd | Transport & logistics | 2023 |
| Manny Brard Ltd | Professional & scientific | 2022 |
| Manny's Performing Arts Ltd | Information & communication | 2025 |
| Mannydegun Ltd | Health & social care | 2018 |
| Manor & Sons Investments Ltd | Financial services | 2019 |
| Manor & Sons Properties Limited | Real estate | 2021 |
| Manor Car Solutions Ltd. | Wholesale & retail | 2014 |
| Manor Carpentry Services Ltd | Extraterritorial | 2020 |
| Manor Farm (Leicester) Limited | Construction | 2019 |
| Manor Farm AD Ltd | Agriculture & fishing | 2016 |
| Manor Farm Mews Management Company Limited | Households | 2017 |
| Manor Farm Titchwell Management Company Ltd | Households | 2025 |
| Manor Homes (Rutland) Ltd | Construction | 2021 |
| Manor House (Oadby) Ltd | Real estate | 2025 |
| Manor Opticals Ltd | Health & social care | 2025 |
| Manor Park Medical Practice Limited | Health & social care | 2022 |
| Manor Paving & Landscapes Ltd | Administrative & support | 2022 |
| Manor Pharmaceuticals Ltd | Wholesale & retail | 2025 |
| Manor Sporting Ltd | Arts & recreation | 2025 |
| Manor Work Health Ltd | Professional & scientific | 2011 |
| Manov Logistics Ltd | Construction | 2021 |
| Manpreet Singh Mandair Limited | Construction | 2025 |
| Manprit Transport Ltd | Transport & logistics | 2023 |
| Manroj Fish Bar Ltd | Hospitality | 2026 |
| Mansa Barber Leicester Ltd | Other services | 2025 |
| Mansah Ltd | Financial services | 2022 |
| Mansan Limited | Health & social care | 2015 |
| Mansfield Road Hand Carwash Ltd | Wholesale & retail | 2019 |
| Mansfield Road Tyre Services Ltd | Wholesale & retail | 2020 |
| Mansha Dance School Limited | Other services | 2017 |
| Mansiprim Limited | Real estate | 2019 |
| Mansuri Contractors Ltd | Construction | 2018 |
| Mansuri Group Ltd | Wholesale & retail | 2025 |
| Manta 400 Parts Ltd | Manufacturing | 2020 |
| Mantas and SON Transport Ltd | Transport & logistics | 2014 |
| Mantiks Ltd | Financial services | 2021 |
| Mantis Records Ltd | Arts & recreation | 2025 |
| Mantix Ltd | Construction | 2016 |
| Mantle House (Broughton Astley) Management Company Limited | Households | 2021 |
| Mantra Logistics Limited | Transport & logistics | 2020 |
| Mantrish Ltd | Wholesale & retail | 2025 |
| Manu Parivar Limited | Real estate | 2021 |
| Manufacturing & Material Innovation Ltd | Professional & scientific | 2024 |
| Manvolve Consulting Ltd | Information & communication | 2024 |
| Many Motors UK Limited | Wholesale & retail | 2023 |
| Manzanilla Nine Limited | Administrative & support | 2005 |
| Manzil One Properties Ltd | Real estate | 2026 |
| MAP Investments (Leic) Ltd | Real estate | 2024 |
| MAP Management Limited | Professional & scientific | 2016 |
| MAP Pharma Ltd | Wholesale & retail | 2019 |
| MAP Property Investments Limited | Real estate | 2011 |
| Mapa (Leicester) Ltd | Professional & scientific | 2023 |
| Mapalo Lupunga Ltd | Transport & logistics | 2024 |
| Maphin Ltd | Health & social care | 2023 |
| Mapindu Limited | Health & social care | 2014 |
| Maple ARK (Holdings) Ltd | Construction | 2020 |
| Maple ARK Limited | Construction | 2011 |
| Maple Distribution Ltd | Wholesale & retail | 2025 |
| Maple Event Management Ltd | Hospitality | 2013 |
| Maple Solutions Ltd | Extraterritorial | 2009 |
| Maple Trees Studio Ltd | Manufacturing | 2019 |
| Mapleshell Limited | Arts & recreation | 1990 |
| Maplewell Estates Limited | Real estate | 2015 |
| Maplewell Investments Limited | Real estate | 2022 |
| Maplley Services Ltd | Transport & logistics | 2015 |
| Mapp Engineering Ltd | Administrative & support | 2024 |
| Mapperley Estates Ltd | Real estate | 2026 |
| Mapperley Park Limited | Real estate | 2024 |
| Mappers Fowler Ltd | Wholesale & retail | 2025 |
| Mappin & Webb Limited | Wholesale & retail | 1897 |
| Maps & Co Property Investment Limited | Real estate | 2024 |
| Maps Care and Supported Living Limited | Health & social care | 2025 |
| Maps Cash and Carry Ltd | Wholesale & retail | 2011 |
| Maps U.K Holdings Limited | Financial services | 2025 |
| MAQ53 Limited | Health & social care | 2021 |
| Maqam AL Baraka Tourism Ltd | Administrative & support | 2025 |
| MAR Enterprise Limited | Wholesale & retail | 2019 |
| MAR Parts Limited | Wholesale & retail | 1964 |
| Mar-Max Ltd | Transport & logistics | 2016 |
| Mar-O-Mar Investments Limited | Real estate | 2012 |
| Mara Corporation Ltd | Wholesale & retail | 2017 |