| A M UK Holdings Limited | Financial services | 2020 |
| A M V Works Ltd | Information & communication | 2026 |
| A M Z Property Group Limited | Real estate | 2019 |
| A Made Mind Limited | Wholesale & retail | 2021 |
| A Mako Ltd | Construction | 2008 |
| A Mamma Holdings Limited | Financial services | 2025 |
| A MAN & a PEN Limited | Professional & scientific | 2022 |
| A MAN About a Dog Limited | Administrative & support | 2013 |
| A MAN and Van Limited | Transport & logistics | 2023 |
| A MAN Removal Services Ltd | Transport & logistics | 2025 |
| A MAN With a PAN Ltd | Hospitality | 2025 |
| A Mann Properties Limited | Real estate | 2020 |
| A Mano Products Ltd | Wholesale & retail | 2012 |
| A MAP of US Ltd | Information & communication | 2025 |
| A Maqbool & Co Limited | Professional & scientific | 2005 |
| A Margarita Limited | Construction | 2025 |
| A Marketing Agency Ltd | Professional & scientific | 2010 |
| A Marketing Genius Limited | Professional & scientific | 2018 |
| A Marketing Limited | Administrative & support | 2017 |
| A Marr & Associates Limited | Professional & scientific | 2013 |
| A Martini Ltd | Construction | 2021 |
| A Masood Holdings Ltd | Wholesale & retail | 2024 |
| A Matter of Ice and Breath Limited | Other services | 2024 |
| A Matter of Words Ltd | Information & communication | 2022 |
| A Mayfair Company Limited | Extraterritorial | 2012 |
| A Mcguinness Copy Ltd | Professional & scientific | 2015 |
| A Mcmillan Group Limited | Administrative & support | 2025 |
| A Meaningful Life Limited | Health & social care | 2026 |
| A Media Promotion Limited | Other services | 2016 |
| A Media Solutions Limited | Information & communication | 2012 |
| A Medida Limited | Administrative & support | 2009 |
| A Meet Point UK Ltd | Hospitality | 2025 |
| A Memoria D’Uomo Limited | Information & communication | 2025 |
| A Menace World Ltd | Hospitality | 2026 |
| A Mere Co. Limited | Wholesale & retail | 2015 |
| A Messing Co Ltd | Administrative & support | 2009 |
| A Method Ltd | Arts & recreation | 2018 |
| A Miao Miao Limited | Wholesale & retail | 2026 |
| A Miari Construction Limited | Construction | 2022 |
| A Mighty Stranger Limited | Information & communication | 2022 |
| A Mikey Idea Limited | Arts & recreation | 2025 |
| A Millar Consulting Ltd | Professional & scientific | 2009 |
| A Millet Limited | Wholesale & retail | 2023 |
| A Million ADS Holdings Limited | Professional & scientific | 2015 |
| A Million ADS Limited | Professional & scientific | 2016 |
| A Million Creations Ltd | Wholesale & retail | 2024 |
| A Million Days Production Ltd | Information & communication | 2021 |
| A Million Freds Productions Limited | Arts & recreation | 1998 |
| A Million MAN Construction Ltd | Construction | 2026 |
| A Million Realities Foundation | Other services | 2021 |
| A Million Years Ltd | Information & communication | 2025 |
| A Mindful Company Ltd | Wholesale & retail | 2025 |
| A Mindful Message Ltd | Education | 2022 |
| A Mindscape Consultancy Ltd | Extraterritorial | 2025 |
| A Mindtech Ltd | Administrative & support | 2024 |
| A Miracle Production Limited | Information & communication | 2025 |
| A Mizera Ltd | Administrative & support | 2016 |
| A Moloney Construction Limited | Construction | 2007 |
| A Moment to Remember Ltd | Other services | 2024 |
| A Moment's Peace Beautique Ltd | Other services | 2025 |
| A Monaghan Ltd Ltd | Transport & logistics | 2025 |
| A Mose Hold Co Limited | Energy | 2026 |
| A Most Unlikely Builder Limited | Professional & scientific | 2022 |
| A Most Wanted MAN Limited | Information & communication | 2012 |
| A Mother Place Limited | Information & communication | 2016 |
| A Mother Space CIC | Other services | 2026 |
| A Mother’S Touch CIC | Health & social care | 2022 |
| A Motion Studio Limited | Wholesale & retail | 2020 |
| A Motor Sport Limited | Arts & recreation | 2019 |
| A Move Removals Ltd | Transport & logistics | 2026 |
| A Movement Perspective Ltd | Education | 2020 |
| A MUG of Life Ltd | Wholesale & retail | 2025 |
| A Mukhtar Estates Ltd | Real estate | 2023 |
| A Mummy TOO Ltd | Professional & scientific | 2017 |
| A Musstt Ltd | Real estate | 2024 |
| A N 1 Consulting Limited | Administrative & support | 2018 |
| A N a Company Services Limited | Professional & scientific | 2009 |
| A N a Limited | Wholesale & retail | 2000 |
| A N a Supermarkets Ltd | Wholesale & retail | 2025 |
| A N a Suppliers Ltd | Wholesale & retail | 2019 |
| A N Advance Solutions Ltd | Professional & scientific | 2025 |
| A N ALL Services Ltd | Other services | 2025 |
| A N Building Services Limited | Construction | 2012 |
| A N Contractors Ltd | Other services | 2010 |
| A N D Building Ltd | Construction | 2016 |
| A N D Home Solutions Ltd | Construction | 2016 |
| A N Design Group Ltd | Construction | 2021 |
| A N E Developments Ltd | Real estate | 2020 |
| A N Fashion Design Limited | Professional & scientific | 2018 |
| A N Ford Surveyors Limited | Professional & scientific | 2012 |
| A N G Property Ltd | Real estate | 2023 |
| A N K Group Limited | Wholesale & retail | 2019 |
| A N M Builders Limited | Construction | 2015 |
| A N P Enterprise Ltd | Manufacturing | 2019 |
| A N S Valeting Ltd | Other services | 2025 |
| A N Tailoring Limited | Other services | 2018 |
| A N Tours Ltd | Administrative & support | 2021 |
| A N Y Limited | Hospitality | 2026 |
| A N Z Associates Limited | Administrative & support | 2005 |
| A Napleton Film Limited | Information & communication | 2023 |