| Match UP Select Ltd | Arts & recreation | 2026 |
| Matchcraft Limited | Wholesale & retail | 1990 |
| Matchman Supplies Angling Centre Limited | Wholesale & retail | 2011 |
| Matchpoint Limited | Arts & recreation | 2025 |
| Matees Properties Limited | Hospitality | 2023 |
| Matelot Enterprise Ltd | Other services | 2017 |
| Material Blinds Ltd | Other services | 2023 |
| Materialink Ltd | Information & communication | 2025 |
| Materials Testing Group Labs Limited | Construction | 2011 |
| Materials Testing Group Limited | Construction | 2009 |
| Materials Testing Services Limited | Professional & scientific | 2024 |
| Maternal Minds CIC | Professional & scientific | 2025 |
| Matese Property Limited | Real estate | 2023 |
| Matfin Ltd | Professional & scientific | 2025 |
| Math Property Holdings Ltd | Real estate | 2024 |
| Mathafern Holdings Ltd | Financial services | 2020 |
| Matharus Properties Ltd | Real estate | 2024 |
| Mathematical Solutions Limited | Professional & scientific | 2017 |
| Mather & Mather Ltd | Real estate | 2022 |
| Mathoe Cleaning Service Ltd | Administrative & support | 2023 |
| Mathub Limited | Professional & scientific | 2016 |
| Matilda Developments Ltd | Real estate | 2017 |
| Matin Estates Limited | Real estate | 2026 |
| Matis Limited | Hospitality | 2019 |
| Matlock & Langley Limited | Wholesale & retail | 2024 |
| Matmroz Ltd | Transport & logistics | 2017 |
| Matoshi Holdings Ltd | Real estate | 2023 |
| Matoshi Properties Limited | Real estate | 2024 |
| Matra Ltd | Real estate | 2021 |
| Matrealm (Exports) Limited | | 1979 |
| Matri Group UK Limited | Wholesale & retail | 2025 |
| Matriarch Personnel Ltd | Administrative & support | 2025 |
| Matrix (Computer Support) Limited | Information & communication | 1989 |
| Matrix (Computers) Limited | Information & communication | 1984 |
| Matrix Build Limited | Construction | 2021 |
| Matrix IP Limited | Information & communication | 2000 |
| Matrix IP Management Limited | Information & communication | 2024 |
| Matrix NET Limited | Information & communication | 2000 |
| Matrix Supplies Ltd | Wholesale & retail | 2023 |
| Matrix Supported Living Ltd | Health & social care | 2023 |
| Matrixgrade Limited | Administrative & support | 2020 |
| Matro Ltd | Construction | 2006 |
| Mats Optics Ltd | Wholesale & retail | 2022 |
| Matt Davies-Adams Limited | Information & communication | 2020 |
| Matt James Home Improvements Limited | Construction | 2017 |
| Matt Rigby Heating Ltd | Construction | 2023 |
| Matt Rowntree Mortgage Solutions Ltd | Financial services | 2022 |
| Matt Smith Plastic Surgery Ltd | Health & social care | 2015 |
| Matt Walsh Construction Limited | Construction | 2018 |
| Matt Woods Performance and Wellness Limited | Other services | 2021 |
| Mattar Property Ltd | Real estate | 2018 |
| Mattayah Consulting Ltd. | Information & communication | 2025 |
| Mattdora Health & Social Care Limited | Public administration | 2024 |
| Matthew Footitt AV Limited | Arts & recreation | 2026 |
| Matthew Hird Freelance Design Limited | Professional & scientific | 2017 |
| Matthew Holland Independent Living Ltd | Manufacturing | 2024 |
| Matthew James Recruitment Ltd | Professional & scientific | 2023 |
| Matthew Macleod Web Development Ltd | Information & communication | 2018 |
| Matthew Page Logistics Ltd | Transport & logistics | 2026 |
| Matthew Sanders Architects Ltd | Professional & scientific | 2019 |
| Matthew's Lettings and Services Ltd | Real estate | 2021 |
| Matthews Group Limited | Professional & scientific | 2015 |
| Matthews Plumbing & Heating Limited | Construction | 2010 |
| Matthews Productions Ltd | Professional & scientific | 2020 |
| Matthyas Transport Ltd | Transport & logistics | 2025 |
| Mattis Properties Ltd | Real estate | 2017 |
| Mattmatt Enterprises Limited | Real estate | 2018 |
| Matty's Ltd | Wholesale & retail | 2019 |
| Maud & B Limited | Hospitality | 2009 |
| Maud Street Motors Ltd | Wholesale & retail | 2022 |
| Maulkins Lettings Ltd | Real estate | 2020 |
| Maun River Developments Limited | Construction | 2022 |
| Maun River Group Limited | Financial services | 2022 |
| Maungira Limited | Information & communication | 2015 |
| Mauro Casa Limited | Real estate | 2019 |
| Mausuk Ltd | Public administration | 2024 |
| Mauudhi Limited | Arts & recreation | 2025 |
| MAV Play Limited | Hospitality | 2017 |
| Mavambo Ltd | Health & social care | 2025 |
| Mavana Limited | Wholesale & retail | 2020 |
| Mavayah Living Ltd | Hospitality | 2021 |
| Maveli Store Ltd | Wholesale & retail | 2024 |
| Maven Analytica Ltd | Information & communication | 2020 |
| Maven Food Consultancy Ltd | Hospitality | 2020 |
| Maven Games Ltd | Wholesale & retail | 2012 |
| Mavenspan Limited | Professional & scientific | 2009 |
| Mavera.Ai Ltd | Information & communication | 2025 |
| Maverick Estates Limited | Real estate | 2020 |
| Maville Court Limited | Real estate | 2014 |
| Mawhood Ltd | Professional & scientific | 2022 |
| Mawson Builders Limited | Construction | 2016 |
| Mawuena Beauty Ltd | Other services | 2024 |
| MAX AV Ltd | Wholesale & retail | 2008 |
| MAX Bargain Ltd | Wholesale & retail | 2020 |
| MAX Business Solutions Limited | Administrative & support | 2015 |
| MAX Charles Limited | Wholesale & retail | 2019 |
| MAX Education Limited | Education | 2009 |
| MAX Holdings Limited | Financial services | 2016 |
| MAX IT Ltd | Information & communication | 1999 |
| MAX K Limited | Administrative & support | 2003 |