| Lynx Training Academy Limited | Education | 2025 |
| Lyon and Feather Ltd | Wholesale & retail | 2026 |
| Lyon Engineering Company Limited | Real estate | 1968 |
| Lyon Property Holdings Limited | Real estate | 2020 |
| Lyonhurst Life Limited | Financial services | 2017 |
| Lyonhurst Mortgages Ltd | Other services | 2019 |
| Lyonhurst Wealth Limited | Financial services | 2021 |
| Lyons Choice Ltd | Transport & logistics | 2024 |
| Lyonz DEN Ltd | Administrative & support | 2017 |
| Lyonz DEN Neng Ltd | Hospitality | 2025 |
| Lyric House Studios Limited | Information & communication | 2019 |
| Lysmand Limited | Professional & scientific | 2015 |
| Lysmed Academy CIC | Health & social care | 2025 |
| Lysmed Consulting Limited | Real estate | 2019 |
| Lysna Ltd | Professional & scientific | 2018 |
| LYT Tattoo Ltd | Other services | 2024 |
| Lytchgates Solutions Limited | Professional & scientific | 2020 |
| Lythgoe Holdings Limited | Real estate | 2019 |
| LYX Evergreen Limited | Wholesale & retail | 2025 |
| LZ AI Evolution Ltd | Information & communication | 2025 |
| M & a Bolger Limited | Real estate | 2014 |
| M & a Leisure Ltd | Hospitality | 2017 |
| M & a Metals Ltd | Other services | 2011 |
| M & C Group Limited | Manufacturing | 2016 |
| M & G Haulage Ltd | Transport & logistics | 2011 |
| M & H Groundworks Ltd | Construction | 2013 |
| M & J Engineering Special Alloy Machining Ltd | Manufacturing | 2013 |
| M & J Healthcare Limited | Health & social care | 2014 |
| M & M Blinds Limited | Manufacturing | 2018 |
| M & M Builders (Yorkshire) Ltd | Construction | 2015 |
| M & M Decorating Services Ltd | Construction | 2012 |
| M & M Property (Yorkshire) Limited | Real estate | 2022 |
| M & M Property Ventures LLP | | 2014 |
| M & N Landscapes Limited | Administrative & support | 2010 |
| M & N Project Consultants Ltd | Construction | 2025 |
| M & S Commercial Property Services Limited | Real estate | 2026 |
| M & T Metals Limited | Manufacturing | 1992 |
| M & T Trade Cars Limited | Wholesale & retail | 2022 |
| M &S Motors Ltd | Wholesale & retail | 2023 |
| M a and N Properties Limited | Real estate | 2015 |
| M a B Charitable Trust | Professional & scientific | 2012 |
| M a Batty Building and Civil Engineering Limited | Construction | 2021 |
| M a S Advisory Limited | Professional & scientific | 2017 |
| M a White Limited | Other services | 2010 |
| M and a Products Ltd | Wholesale & retail | 2020 |
| M and H Inns Ltd | Hospitality | 2018 |
| M and S Convenience Shop Ltd | Wholesale & retail | 2021 |
| M Anees Sellers Ltd | Wholesale & retail | 2025 |
| M ARC Investments Limited | Wholesale & retail | 2022 |
| M B Advertising and Marketing Ltd | Professional & scientific | 1989 |
| M B Business Associates Ltd | Information & communication | 2010 |
| M B Earthmoving Ltd | Construction | 2016 |
| M Beauty Salon Ltd | Other services | 2020 |
| M C Building & Civil Engineering Ltd | Construction | 2023 |
| M C Ceiling & Partitions Limited | Construction | 2004 |
| M Clayton Cladding Limited | Construction | 2022 |
| M Connelly Engineering Limited | Manufacturing | 2013 |
| M D Building & Roofing Limited | Construction | 2019 |
| M D Consultants (UK) Limited | Education | 2005 |
| M D D Properties Ltd | Real estate | 2013 |
| M D Magee Ltd | Wholesale & retail | 2025 |
| M D Tiling & Interiors Ltd | Construction | 2018 |
| M D Wright Machinery Removals Limited | Transport & logistics | 2002 |
| M Dhdt Ltd | Health & social care | 2025 |
| M Downs & Associates Limited | Professional & scientific | 2012 |
| M East Logisitics Limited | Transport & logistics | 2025 |
| M Eldabe Holdings Limited | Professional & scientific | 2024 |
| M G Data Limited | Other services | 2003 |
| M G Mathias Hospitality Ltd | Hospitality | 2025 |
| M Gibson Consultancy Ltd | Professional & scientific | 2026 |
| M Gibson Property Limited | Real estate | 2018 |
| M H Geotechnical Ltd | Construction | 2022 |
| M Hall Motors Ltd | Wholesale & retail | 2023 |
| M Harte Haulage & Hire Ltd | Transport & logistics | 2015 |
| M Howe Electrical Services Ltd | Construction | 2011 |
| M Hussain Fastfood Ltd | Hospitality | 2025 |
| M I Mosley & Co LP | | 2023 |
| M Idrees Healthcare Ltd | Health & social care | 2023 |
| M J Motor Trade Ltd | Manufacturing | 2026 |
| M J Caine & Sons Limited | Agriculture & fishing | 2008 |
| M J Gleeson (International) Limited | Extraterritorial | 1969 |
| M J Gleeson Group Limited | Financial services | 1950 |
| M J Holdsworth Ltd | Wholesale & retail | 2019 |
| M J Hughes Limited | Administrative & support | 2002 |
| M J Resource Limited | Administrative & support | 2026 |
| M J Squire Limited | Professional & scientific | 2018 |
| M L Shepherd Haulage Limited | Transport & logistics | 2019 |
| M M N Development Ltd | Real estate | 2026 |
| M Metwally Ltd | Health & social care | 2014 |
| M Monfredi Builders Limited | Construction | 2002 |
| M Nazir Limited | Professional & scientific | 2015 |
| M Orliaklis Management Limited | Administrative & support | 2025 |
| M Orliaklis Property Limited | Real estate | 2025 |
| M P Loxley Limited | Professional & scientific | 2021 |
| M Quigley Ltd | Information & communication | 2021 |
| M Radley Plastering Ltd | Construction | 2025 |
| M Raees Ltd | Wholesale & retail | 2026 |
| M S S Maintenance Services Ltd | Construction | 2022 |
| M Saad's Limited | Wholesale & retail | 2019 |
| M Shaw Engraving Limited | Manufacturing | 2003 |