| Livewire TSG Ltd | Energy | 2025 |
| Living Ayurveda Limited | Wholesale & retail | 2013 |
| Living Ayurveda Products Holdings Limited | Other services | 2018 |
| Living Ayurveda Yoga Centre Limited | Other services | 2019 |
| Living Veda Resources Limited | Administrative & support | 2021 |
| LJ Morrissey Properties Ltd | Real estate | 2020 |
| LJS Healthcare Services Ltd | Health & social care | 2020 |
| Lkmb Ltd | Transport & logistics | 2024 |
| LMD Telecom Ltd | Information & communication | 2020 |
| Lockhurst Holdings Limited | Professional & scientific | 1987 |
| Logico Solutions Limited | Transport & logistics | 2024 |
| London EYE Technologies Ltd | Administrative & support | 2022 |
| London Fresh Food and Grocery Limited | Wholesale & retail | 2018 |
| Loramark Ltd | Other services | 2026 |
| Louise Rigby Limited | Wholesale & retail | 2025 |
| Loveable Clothing Limited | Wholesale & retail | 2020 |
| LS Creative Services Limited | Real estate | 2024 |
| LT Construction NW Ltd | Administrative & support | 2016 |
| Lucas Property Limited | Real estate | 2025 |
| Luer Limited | Wholesale & retail | 2024 |
| Lumara Capital Ltd | Construction | 2025 |
| Lusso Clothing Ltd | Wholesale & retail | 2023 |
| LUX Generation Limited | Other services | 2023 |
| Luxur Fashion Limited | Wholesale & retail | 2024 |
| Lynbrook Managed Services Limited | Information & communication | 1978 |
| Lynch Wealth Management Ltd | Financial services | 2021 |
| M and E Insulation Services Limited | Construction | 2026 |
| M C Electrical (NW) Ltd | Construction | 2021 |
| M Carter Law Limited | Professional & scientific | 2017 |
| M Chisa Ltd | Health & social care | 2022 |
| M D Electrical Skelmersdale Ltd | Construction | 2014 |
| M Jones Building Services Ltd | Construction | 2013 |
| M&D Kelly Group Ltd | Wholesale & retail | 2026 |
| M&J Haulage Limited | Construction | 2023 |
| M.Edwards Installations Limited | Construction | 2024 |
| M.O. RIG Services Limited | Mining & quarrying | 2024 |
| M.Z.K Trans. Ltd. | Transport & logistics | 2014 |
| M.Z.K. Logistics Limited | Transport & logistics | 2025 |
| Maas Assets Ltd | Real estate | 2025 |
| Maas Capital Ltd | Real estate | 2017 |
| Maas Group Ltd | Real estate | 2024 |
| Maas Management Limited | Real estate | 2020 |
| Maas Property Group Limited | Real estate | 2020 |
| Maas Real Estates Ltd | Real estate | 2026 |
| Machineium Limited | Information & communication | 2024 |
| Macovei Expert Delivery Ltd | Transport & logistics | 2025 |
| Made in WN8 C.I.C. | Wholesale & retail | 2020 |
| Made Properties & Investments Limited | Real estate | 2024 |
| Magic of ME Ltd | Information & communication | 2026 |
| Magic-Trans Ltd | Transport & logistics | 2014 |
| Magikal Movements CIC | Health & social care | 2026 |
| Maharishi Peace Programme | Other services | 2015 |
| Maher Refrigeration Limited | Manufacturing | 2005 |
| Mahtab Pizza Ltd | Hospitality | 2025 |
| Mainline Records Limited | Arts & recreation | 2016 |
| Majestick Stickers Ltd | Manufacturing | 2023 |
| Makha Medical Ltd | Health & social care | 2025 |
| Makwan Food Ltd | Hospitality | 2024 |
| MANGO13.COM Limited | Information & communication | 2009 |
| Maplewood Rail Limited | Construction | 2009 |
| Marsdens Chimney Sweeps & Stove Installations Ltd | Administrative & support | 2024 |
| Marshgate Service Centre Ltd | Wholesale & retail | 2012 |
| Mascott Homes NW Limited | Real estate | 2026 |
| Massive Creative Ltd | Information & communication | 2020 |
| Matrix Health Ltd | Wholesale & retail | 2021 |
| Matt FOX Physiotherapy Limited | Health & social care | 2015 |
| Matthew Valentine Decorating Services Limited | Construction | 2013 |
| Matyas Care Ltd | Health & social care | 2023 |
| Maurice Rigby Limited | Transport & logistics | 1963 |
| MAY Lettings & Developments Ltd | Real estate | 2019 |
| Mayne Security Limited | Administrative & support | 2022 |
| Mayoki Limited | Transport & logistics | 2025 |
| Maypole Development Ltd | Construction | 2019 |
| MBL Leaflet Distribution Limited | Administrative & support | 2015 |
| MC Integrated Services Ltd | Manufacturing | 2018 |
| Mccoy Housing (Skelmersdale) Ltd | Real estate | 2024 |
| Mcmullen Construction Ltd | Construction | 2024 |
| Mcnally & SON Construction Limited | Construction | 2023 |
| MCR 2022 Limited | Professional & scientific | 2022 |
| MCR Property Solutions Limited | Construction | 2023 |
| MCR Rental Solutions Limited | Real estate | 2024 |
| Meadow Spaces Ltd. | Arts & recreation | 2017 |
| Mechan Controls Limited | Manufacturing | 2017 |
| Medpro Solutions Limited | Health & social care | 2012 |
| Medusa's Menagerie Ltd | Agriculture & fishing | 2025 |
| MEE Constructions Ltd | Construction | 2026 |
| Meerkat Removals & Storage Cambridge Ltd | Transport & logistics | 2021 |
| Meganona Limited | Transport & logistics | 2016 |
| Megasun UK Ltd | Extraterritorial | 2014 |
| Mellors Catering Services Limited | Hospitality | 2011 |
| Mellors Consolidated Limited | Financial services | 2018 |
| Menduk Limited | Administrative & support | 2014 |
| Menelor Ltd | Information & communication | 2026 |
| Meni Ltd | Transport & logistics | 2015 |
| Merdchan Limited | Construction | 2024 |
| Merebrow Gundogs Ltd | Other services | 2016 |
| Meridian App Limited | Information & communication | 2026 |
| Merit Engineering Resources Limited | Administrative & support | 2012 |
| Mert Yilmaz Limited | Administrative & support | 2020 |
| Messenger Express Limited | Transport & logistics | 2010 |