| LP SD Twenty Four Limited | Wholesale & retail | 2023 |
| LP SD Twenty Nine Limited | Wholesale & retail | 2023 |
| LP SD Twenty Two Limited | Wholesale & retail | 2023 |
| LPM Structural Engineering Ltd | Professional & scientific | 2017 |
| LRC Window Cleaning Services Ltd | Administrative & support | 2026 |
| LS Holdings (NW) Limited | Professional & scientific | 2016 |
| LSL Block Management Ltd | Real estate | 2019 |
| LT2008 Trading Ltd | Wholesale & retail | 2026 |
| Ltgnat Properties Ltd | Real estate | 2024 |
| LTH Supplies Ltd | Wholesale & retail | 2026 |
| LTP Services Ltd | Construction | 2019 |
| Luca Consultancy Limited | Health & social care | 2023 |
| Lucam Consultancy Limited | Administrative & support | 2012 |
| Lucam Lives Limited | Health & social care | 2017 |
| Lucam Retreats CIC | Public administration | 2019 |
| Luccabeau Ltd | Professional & scientific | 2026 |
| Luccio Official Ltd | Wholesale & retail | 2025 |
| Ludosanul Ltd | Transport & logistics | 2022 |
| Luke K. Aldred Ltd | Information & communication | 2019 |
| Luma Storytelling Limited | Professional & scientific | 2019 |
| Lumi's Services Ltd | Administrative & support | 2019 |
| Lumine Health Limited | Health & social care | 2026 |
| Luminescent Grace Ltd | Other services | 2025 |
| LUX Entertainments Ltd | Arts & recreation | 2018 |
| LUX Photography Ltd | Professional & scientific | 2020 |
| Luxe Housing Ltd | Real estate | 2025 |
| Luxre Limited | Manufacturing | 2020 |
| Luxury Advertising Ltd | Transport & logistics | 2023 |
| Luxury Designer Jewellers Ltd | Wholesale & retail | 2025 |
| Luxury Nails & Spa WA10 Ltd | Other services | 2025 |
| LV Nails Limited | Other services | 2020 |
| LVB Associates Ltd | Professional & scientific | 2011 |
| LVE Joinery Limited | Construction | 2018 |
| LW Commercial Ltd | Financial services | 2026 |
| LWD & AD Properties Ltd | Real estate | 2024 |
| LY Properties Ltd | Real estate | 2020 |
| Lymewood Physiotherapy Ltd | Health & social care | 2017 |
| Lynas Clinical Safety Limited | Health & social care | 2024 |
| Lyne UK Limited | Hospitality | 2021 |
| M & a Zaki Ltd | Wholesale & retail | 2018 |
| M &S Homes Limited | Real estate | 2019 |
| M Bibby and SON Ltd | Wholesale & retail | 2025 |
| M Burke Enterprise Ltd | Wholesale & retail | 2012 |
| M D BUS & Coach Limited | Transport & logistics | 2014 |
| M J Cook Holdings Ltd | Other services | 2021 |
| M J Scaffolding NW Limited | Construction | 2015 |
| M J Stephayne Aesthetic Health & Beauty Ltd | Health & social care | 2023 |
| M Slater Consultancy Limited | Health & social care | 2016 |
| M&B Roofing and Cladding (NW) Limited | Construction | 2018 |
| M&D Services Ltd | Hospitality | 2022 |
| M&M North West Properties Ltd | Real estate | 2017 |
| M&Z Trans Ltd | Transport & logistics | 2016 |
| M-Croft Property Ltd | Real estate | 2025 |
| M. a. Retailers Limited | Wholesale & retail | 2016 |
| M. Rodgers Joinery Ltd | Construction | 2025 |
| M.&C.T. Ltd | Manufacturing | 2002 |
| M.I.L.E Property Maintenance Ltd | Construction | 2023 |
| M.J.D Engineering Limited | Professional & scientific | 1999 |
| M6 Motorhome Hire Ltd | Administrative & support | 2025 |
| M6 Truck & Trailer Limited | Wholesale & retail | 2020 |
| MA Smith & Co. (Warrington) Limited | Other services | 2000 |
| MAC Roofing & Building Maintenance Ltd | Construction | 2025 |
| MAC UK Services Ltd | Construction | 2018 |
| Macdonald Chips Limited | Wholesale & retail | 2025 |
| Macs Power Engineering Ltd | Energy | 2016 |
| Mademoiselle Najwa Sings Ltd | Information & communication | 2025 |
| Magart Ltd | Transport & logistics | 2026 |
| Magic Sound Production Ltd | Information & communication | 2016 |
| Magniframe Music Limited | Information & communication | 2025 |
| Magnum Motorsport Composites Ltd | Manufacturing | 2025 |
| Maha & Kvpe Ltd | Wholesale & retail | 2025 |
| MAI HO Limited | Hospitality | 2025 |
| Main Engineering & Maintenance Ltd | Manufacturing | 2023 |
| Mainlink Holdings Limited | Administrative & support | 2001 |
| Mainlink Maintenance Limited | Construction | 2001 |
| Maison Forme Ltd | Manufacturing | 2026 |
| Majas Switchgear Limited | Professional & scientific | 2016 |
| Major Brigg Building Company Ltd | Construction | 1998 |
| Makerfield Motors Limited | Transport & logistics | 2025 |
| Makin Mighty Ltd | Professional & scientific | 2025 |
| Malahide Developments Limited | Construction | 2023 |
| Malfabrige Homes Ltd | Real estate | 2024 |
| Malik Trading Solution Ltd | Wholesale & retail | 2026 |
| Mall Construction Commercial Services Ltd | Professional & scientific | 2019 |
| Malvik Property Limited | Real estate | 2018 |
| Mama Doners Ltd | Hospitality | 2020 |
| Mama Fast Food Ltd | Hospitality | 2017 |
| Mama Kebab WA9 Ltd | Hospitality | 2026 |
| Manatec Industrial Services Ltd | Professional & scientific | 2024 |
| Manchester Short Stays Ltd | Real estate | 2018 |
| MANGO-5 Maintenance Limited | Construction | 2012 |
| Manzanilla Four Limited | Administrative & support | 2005 |
| Manzoku Limited | Hospitality | 2019 |
| Manzoku Mobile Ltd | Hospitality | 2024 |
| Manzoku ST Helens Ltd | Hospitality | 2025 |
| Maple Bespoke Interiors Limited | Manufacturing | 2021 |
| Mapmoon&Magic Limited | Wholesale & retail | 2024 |
| Marad Limited | Professional & scientific | 2005 |
| Marb Global Ltd | Wholesale & retail | 2018 |
| Marchio Diretto Ltd | Wholesale & retail | 2019 |