| MAX Grunewald RB Ltd | Information & communication | 2025 |
| MAX Legend Ltd | Wholesale & retail | 2024 |
| MAX LOAD7 Ltd | Wholesale & retail | 2025 |
| MAX Sprint& Co Limited | Manufacturing | 2025 |
| MAX Vibe Ltd | Wholesale & retail | 2025 |
| MAX Warner Ltd | Administrative & support | 2019 |
| MAX1M Limited | Professional & scientific | 2019 |
| Maxbrand Hub Ltd | Wholesale & retail | 2025 |
| Maxemise Ltd | Other services | 2019 |
| Maxg Construction Ltd | Construction | 2019 |
| Maxi Marketing Ltd | Other services | 2025 |
| Maxilord Partners L.P. | | 2017 |
| Maximos Zachariadis Ltd | Manufacturing | 2018 |
| Maximum Global Collections Ltd | Professional & scientific | 2018 |
| Maximum Respect Limited | Information & communication | 2013 |
| Maximum Respect Property Ltd | Other services | 2016 |
| Maximus Accountants Ltd | Professional & scientific | 2015 |
| Maximus Car Dealers Ltd | Wholesale & retail | 2025 |
| Maximus Energy Ltd | Information & communication | 2025 |
| Maximus Property Development Ltd | Real estate | 2024 |
| Maxinler Limited | Wholesale & retail | 2025 |
| Maxloz Capital Global Limited | Financial services | 2021 |
| Maxmaker Limited | Wholesale & retail | 2025 |
| Maxoorra Ltd | Wholesale & retail | 2025 |
| Maxpandy Ltd | Hospitality | 2019 |
| Maxreach Fulfilment Ltd | Wholesale & retail | 2025 |
| Maxroc Investments Limited | Real estate | 2025 |
| Maxstrong Ltd | Construction | 2019 |
| Maxum Trade Limited | Wholesale & retail | 2009 |
| Maxwell and Mcdonough Limited | Other services | 2022 |
| Maxwell and Sons LLP | | 2019 |
| Maxwell Cleaning Solutions Ltd | Administrative & support | 2018 |
| Maxx Bullion Ltd | Other services | 2016 |
| Maxx Catering Limited | Hospitality | 2026 |
| Maxx Consortium Limited | Real estate | 2019 |
| Maxx FX Limited | Information & communication | 2025 |
| Maxx Securities Ltd | Professional & scientific | 2015 |
| Maxxcompetitions Limited | Other services | 2020 |
| Maxxi Retail Ltd | Wholesale & retail | 2020 |
| Maxxim Residential Design Limited | Professional & scientific | 2008 |
| Maxxon Consulting Ltd | Professional & scientific | 2017 |
| Maxxwear Limited | Wholesale & retail | 2024 |
| MAY Juice Food Ltd | Wholesale & retail | 2024 |
| MAY Rose Devon Limited | Manufacturing | 2024 |
| Maya General Trading Ltd | Real estate | 2019 |
| Maya Marketing Limited | Administrative & support | 2011 |
| Mayaco Ltd | Professional & scientific | 2019 |
| Maybe L&S Entertainment Limited | Information & communication | 2025 |
| Maybell Fibre Limited | Construction | 2023 |
| Maybon Clothing Limited | Wholesale & retail | 2025 |
| Maybury Communications Ltd | Professional & scientific | 2017 |
| Mayellie UK Ltd | Wholesale & retail | 2020 |
| Mayellie UK Property Ltd | Real estate | 2026 |
| Mayfair Crown Group Limited | Wholesale & retail | 2022 |
| Mayfair Executive Travel Limited | Administrative & support | 2017 |
| Mayfair Global Consulting Ltd | Administrative & support | 2017 |
| Mayfair Occasions Limited | Hospitality | 2020 |
| Mayfair Protection Group Ltd | Administrative & support | 2023 |
| Mayfair Realty Limited | Real estate | 2019 |
| Mayfair Recruitment Partnership Solutions Ltd | Professional & scientific | 2017 |
| Mayfair Supplies Ltd | Wholesale & retail | 2019 |
| Mayfair Ventures Technology Ltd | Information & communication | 2015 |
| Mayfield Practice Sales Ltd | Professional & scientific | 2020 |
| Mayflower Escorts UK Ltd | Other services | 2025 |
| Mayflower House RTM Company Limited | Households | 2025 |
| Mayflower Vehicle Systems PLC | Manufacturing | 1991 |
| Mayfly Containers Limited | Manufacturing | 1983 |
| Maygo Limited | Information & communication | 2021 |
| Mayin Management, Ltd | Extraterritorial | 2019 |
| Mayo Farm Systems Ltd | Agriculture & fishing | 2026 |
| Mayor Consultants Limited | Professional & scientific | 2012 |
| Maypole HP Consulting Limited | Administrative & support | 2019 |
| Mays Al-Azzawi Ltd | Health & social care | 2022 |
| Mays PGS Limited | Construction | 2016 |
| Mayshome Limited | Real estate | 2024 |
| Maystone Property Ltd | Real estate | 2017 |
| Maystreet Ltd | Professional & scientific | 2018 |
| Maytel Limited | | 1985 |
| Mayza Ltd | Wholesale & retail | 2023 |
| MAZ Estates Limited | Real estate | 2025 |
| MAZ Self Enhancement Ltd | Health & social care | 2015 |
| Mazhar.Usman Ltd | Wholesale & retail | 2025 |
| Maziah Ltd | Wholesale & retail | 2024 |
| Mazmousa Ltd | Information & communication | 2025 |
| Mazt Consultancy Ltd | Administrative & support | 2018 |
| Mazza Eatz Ltd | Hospitality | 2021 |
| Mazza Treatz Ltd | Wholesale & retail | 2020 |
| Mazzeria Ltd | Wholesale & retail | 2021 |
| MB Beauty Ltd | Wholesale & retail | 2023 |
| MB Care Services Ltd | Wholesale & retail | 2018 |
| MB Commercial Consultancy Ltd | Wholesale & retail | 2019 |
| MB Consultancy & Projects Limited | Professional & scientific | 2014 |
| MB Consultations Ltd | Professional & scientific | 2024 |
| MB Dentistry Limited | Health & social care | 2026 |
| MB Easylife Ltd | Transport & logistics | 2025 |
| MB Game Studio Ltd | Financial services | 2025 |
| MB Inverness Ltd | Wholesale & retail | 2019 |
| MB Jobservice Ltd | Real estate | 2018 |
| MB Laser Welding Limited | Professional & scientific | 2014 |
| MB Private Investment Limited | Financial services | 2016 |