| Manage Fit Ltd | Information & communication | 2020 |
| Manage IT Change Ltd | Information & communication | 2013 |
| Managed HR Solutions Limited | Administrative & support | 2023 |
| MANAGED247 Ltd | Information & communication | 2009 |
| Management Bureau Limited | Professional & scientific | 2004 |
| Management Consulting Partners Ltd | Professional & scientific | 2005 |
| Management Ltd | Real estate | 2015 |
| MANAGER1 Limited | Wholesale & retail | 2025 |
| Manajoy Ltd | Public administration | 2023 |
| Manam Technologies Limited | Information & communication | 2024 |
| Manavisa Ltd | Real estate | 2023 |
| Manbat Solutions Limited | Administrative & support | 2026 |
| Manchester Academy of Procedural Skills Ltd | Education | 2025 |
| Manchester Hangar (UK) Limited | Real estate | 2020 |
| Mancini Sports Coaching Ltd | Education | 2013 |
| Mancroft Property Holdings Ltd | Real estate | 2025 |
| Manda Investments Ltd | Real estate | 2024 |
| Mandarin 180 Limited | Hospitality | 2025 |
| Mandatum Consultancy & Facilities Management Ltd | Professional & scientific | 2024 |
| Mandes Consulting Ltd | Information & communication | 2018 |
| Mandora ST. Clements Limited | Manufacturing | 1921 |
| Mandy Havens Ltd | Transport & logistics | 2025 |
| Manet Services Ltd | Information & communication | 2017 |
| Manex Cargo UK Ltd | Transport & logistics | 2018 |
| Mango Law Ltd | Information & communication | 2020 |
| Mango Sales Limited | Administrative & support | 2014 |
| Mangtech IT Services Ltd | Information & communication | 2019 |
| Manha Foods Limited | Wholesale & retail | 2021 |
| Manha Mini Market Ltd | Wholesale & retail | 2016 |
| Manifest Holdings Limited | Real estate | 2021 |
| Manigham Trading Ltd | Wholesale & retail | 2021 |
| Manihar Homes Ltd | Real estate | 2024 |
| Manipac 2 Ltd | Professional & scientific | 2019 |
| Manipac Ltd | Hospitality | 2016 |
| Mankala Ltd | Information & communication | 2013 |
| Manko Cleaning Service Ltd | Wholesale & retail | 2016 |
| Manland Limited | Administrative & support | 2004 |
| Manlaxm Limited | Information & communication | 2016 |
| Manmaru Limited | Information & communication | 2016 |
| Mann Hire Ltd | Administrative & support | 2025 |
| Mannat Realty Group Ltd | Real estate | 2024 |
| Mannava Technologies Limited | Information & communication | 2016 |
| Manneviv Ltd | Administrative & support | 2019 |
| Mannings Northern Limited | Construction | 2012 |
| Manny's Utilities Solutions Ltd | Construction | 2024 |
| Manolescu Limited | Transport & logistics | 2018 |
| Manor Farm (Milton Keynes) Ltd | Hospitality | 2015 |
| Manor Farm Developments (UK) Limited | Construction | 2001 |
| Manor Farm Garage Ltd | Wholesale & retail | 2019 |
| Manor Farm Management Co Ltd | Households | 2008 |
| Manor Roofing (Herts) Limited | Construction | 2003 |
| Manor Timepieces Ltd | Wholesale & retail | 2016 |
| Manorth Beauty Bar Ltd | Other services | 2022 |
| Manpa Solutions Limited | Information & communication | 2018 |
| Mansfield's & Sons Ltd | Real estate | 2024 |
| Mantec Engineering Limited | Manufacturing | 1995 |
| Manthanoia Limited | Professional & scientific | 2003 |
| Manthatron-Ip Limited | Information & communication | 2004 |
| Mantle Autocare Limited | Professional & scientific | 2016 |
| Mantr Consulting Limited | Information & communication | 2016 |
| Mantra Heating Ltd | Construction | 2013 |
| Manuel Engineering Ltd | Professional & scientific | 2018 |
| Manyara Irene Muyenziwa Foundation (MIM Foundation) Limited | Health & social care | 2022 |
| Man’S Barbers Ltd | Other services | 2020 |
| MAO Care Ltd | Health & social care | 2023 |
| Maomao Ltd | Health & social care | 2025 |
| MAP Electronics Limited | Professional & scientific | 2003 |
| MAP Letting Agents Ltd | Real estate | 2022 |
| MAP Patel Services (UK) Ltd | Health & social care | 2022 |
| Maphutse Care Services Ltd | Health & social care | 2020 |
| Mapicare Limited | Manufacturing | 2022 |
| Maple (183) Limited | Households | 2003 |
| Maple Bidco Limited | Financial services | 2017 |
| Maple Executive Cars Limited | Transport & logistics | 2014 |
| Maple Leaf 65 Limited | Households | 2005 |
| Maple Stone Care Ltd | Health & social care | 2019 |
| Maple Strategy Limited | Professional & scientific | 2019 |
| Maplestar Limited | Real estate | 1998 |
| Mapleys (Newport Pagnell) Limited | Real estate | 1960 |
| Mappa Global Ltd | Hospitality | 2024 |
| MAR MAC Build Ltd | Construction | 2021 |
| Mar-Hom Logistic Ltd | Transport & logistics | 2025 |
| Mara House Limited | Real estate | 2025 |
| Mara Telecom Consulting Limited | Information & communication | 2018 |
| Marabu (U.K.) Limited | Wholesale & retail | 1987 |
| Maradi Transport Limited | Transport & logistics | 2024 |
| Marali Limited | Real estate | 2023 |
| Marangytcg Ltd | Wholesale & retail | 2021 |
| Marask 3BS Ltd | Information & communication | 2019 |
| Maravilla Arabians LLP | | 2009 |
| Marbel Plumbing & Heating Ltd | Construction | 2018 |
| Marble CC Limited | Other services | 2015 |
| Marble Commercial Contracting Ltd | Professional & scientific | 2010 |
| Marble Endeavour Ltd | Professional & scientific | 2020 |
| Marblestone Properties Limited | Real estate | 2024 |
| Marc Plumbing Limited | Construction | 2025 |
| Marc-Alex Ltd | Health & social care | 2021 |
| Marcel Investment Group Limited | Financial services | 2020 |
| Marcel Property Investments Limited | Real estate | 2021 |
| Marcello House Limited Partnership | | 2006 |