| Match My MUM Ltd | Wholesale & retail | 2018 |
| Matchbill Limited | Administrative & support | 1998 |
| Matchday Ready Ltd | Wholesale & retail | 2026 |
| Matchingham Games Limited | Information & communication | 2020 |
| Matchou Dream Ltd | Professional & scientific | 2020 |
| Mateen Properties Ltd | Real estate | 2022 |
| Matele Logistics Ltd | Transport & logistics | 2024 |
| Maternal Matriarch Limited | Administrative & support | 2024 |
| Mateusz Sawicki Ltd | Transport & logistics | 2019 |
| Matharu Builders Limited | Construction | 2022 |
| Matheo Ltd | Information & communication | 2025 |
| Mathlete Ltd | Education | 2024 |
| Matica Enterprise Ltd | Health & social care | 2025 |
| Maticar Ltd | Wholesale & retail | 2018 |
| Matin Prime Limited | Other services | 2016 |
| Matjd Limited | Health & social care | 2023 |
| Matloob & Sons (Investments) Ltd | Real estate | 2020 |
| Matlotlo 3 Limited | Real estate | 2018 |
| Matlotlo 7 Limited | Real estate | 2018 |
| Matlotlo 786 Limited | Real estate | 2022 |
| Matlotlo Holdings Ltd | Real estate | 2023 |
| Matlotlo UK Limited | Real estate | 2019 |
| Matp Consulting Limited | Administrative & support | 2025 |
| Matrix Accountants Ltd | Professional & scientific | 2022 |
| Matrix Alliance Ltd | Administrative & support | 2023 |
| Matrix Doors and Windows Ltd | Construction | 2026 |
| Matrix Mortgages Ltd | Financial services | 2021 |
| Matrix Travels (Leic) Ltd | Transport & logistics | 2018 |
| MATRIX-180 Ltd | Manufacturing | 2024 |
| MATRIX93 Ltd | Professional & scientific | 2025 |
| Matrixweb Ltd | Information & communication | 2023 |
| Matsam Limited | Transport & logistics | 2000 |
| Matson Bespoke Limited | Construction | 2026 |
| Matsons Ltd | Construction | 2006 |
| Matsuda Healthcare Ltd | Health & social care | 2009 |
| Matt Allman Ltd | Transport & logistics | 2014 |
| Matt Builders Limited | Construction | 2019 |
| Matt Elliott Ltd | Professional & scientific | 2018 |
| Matt Folwell Limited | Administrative & support | 2015 |
| Matt Gavin Plumbing & Heating Ltd | Construction | 2012 |
| Matt Hall Electrics Ltd | Manufacturing | 2022 |
| Matt Lumsden Ltd | Manufacturing | 2026 |
| Matt Pickering Ltd | Health & social care | 2014 |
| Matt Wayne Electrical Services Ltd | Construction | 2024 |
| Matt Worthington Brickwork Ltd | Construction | 2018 |
| Matteo Holdings Ltd | Financial services | 2025 |
| Matthew & Pritchard Limited | Professional & scientific | 2007 |
| Matthew D Vice Limited | Professional & scientific | 2017 |
| Matthew Hyde Transport Ltd | Transport & logistics | 2014 |
| Matthew Lavery Ltd | Administrative & support | 2024 |
| Matthew Maria Limited | Professional & scientific | 2018 |
| Matthew Stokes Education Limited | Education | 2017 |
| Matthewnpotts Limited | Real estate | 2025 |
| Matthews Properties Nottingham Limited | Real estate | 2015 |
| Matthias Stokes Associates Ltd | Professional & scientific | 2020 |
| Mattioli Woods (New Walk) Limited | Construction | 2015 |
| Mattioli Woods Limited | Administrative & support | 1995 |
| Matts Properties Ltd | Real estate | 2022 |
| Mattu Commercial Ltd | Real estate | 2024 |
| Mattu Developments Limited | Real estate | 2017 |
| Mattu Investments Ltd | Real estate | 2024 |
| Mattu Properties Limited | Real estate | 2017 |
| Mattyas Cleaning Services Ltd | Administrative & support | 2025 |
| Mattyuk Logistics Limited | Transport & logistics | 2023 |
| Matu Textile Ltd | Manufacturing | 2021 |
| Matumbu Ltd | Transport & logistics | 2026 |
| Maug Trading Ltd | Professional & scientific | 2025 |
| Maurco Ltd | Information & communication | 2010 |
| Mauricare (AS) Limited | Health & social care | 2009 |
| Mauricare (Coventry) Ltd | Health & social care | 2007 |
| Mauricare (Dewsbury) Limited | Health & social care | 2014 |
| Mauricare (London Road) Ltd | Health & social care | 1997 |
| Mauricare (Nottingham) Limited | Health & social care | 2014 |
| Mauricare (Rearsby) Ltd | Health & social care | 2019 |
| Mauricare (Rotherham) Limited | Health & social care | 2012 |
| Mauricare (Wakefield) Ltd | Health & social care | 2011 |
| Mauricare (Worksop) Ltd | Health & social care | 2007 |
| Mauricare Ascot Care Limited | Health & social care | 2012 |
| Mauricare Limited | Health & social care | 2005 |
| Maurice Dibbs Financial Solutions Limited | Financial services | 2007 |
| Maurizio's Restaurant Ltd | Hospitality | 2020 |
| Maurya Structural Engineers Limited | Construction | 2016 |
| Mautby Reliable Ltd | Wholesale & retail | 2014 |
| Mauva Events Ltd | Arts & recreation | 2026 |
| MAV Commercial Investments Ltd | Real estate | 2025 |
| MAV Solutions Ltd | Professional & scientific | 2015 |
| Maven Capital Partners UK LLP | | 2008 |
| Maven Cognition Limited | Financial services | 2016 |
| Maven Corporation Ltd | Financial services | 2024 |
| Maven Hub Ltd | Other services | 2020 |
| Maverick Casinos Limited | Arts & recreation | 2007 |
| Maverick Professional Resources Limited | Education | 2023 |
| Maverik Global Ltd | Wholesale & retail | 2025 |
| Maverikc Videography Limited | Information & communication | 2023 |
| Mavern Care Limited | Health & social care | 2001 |
| Maverns Technologies Limited | Information & communication | 2023 |
| Mavhub Media Ltd | Information & communication | 2026 |
| Mavice Clothing Ltd | Wholesale & retail | 2025 |
| Mavis House Management Limited | Real estate | 2004 |
| Mavrek Limited | Administrative & support | 2020 |