| Lucia Projects 2025 Ltd | Construction | 2025 |
| Luck Star International Industrial Ltd | Manufacturing | 2021 |
| Lucky Base International Ltd. | Extraterritorial | 2024 |
| Lucky Dragon Gillingham Ltd | Hospitality | 2018 |
| Lucky Gillingham Ltd | Hospitality | 2023 |
| Lucy's Dog Grooming Ltd | Other services | 2019 |
| Luka Property Holdings Ltd | Real estate | 2026 |
| Lumen People Solutions Limited | Professional & scientific | 2026 |
| Luminae Crystals Ltd | Wholesale & retail | 2026 |
| Luminara Ventures Ltd | Wholesale & retail | 2025 |
| Luminary Capital Ltd | Real estate | 2021 |
| Luminita Constructions Ltd | Construction | 2023 |
| Lumos Aesthetics Limited | Other services | 2024 |
| Lumysis Ltd | Professional & scientific | 2025 |
| Lund & Francis Creative Limited | Professional & scientific | 2019 |
| Lurbrook Health Ltd | Manufacturing | 2025 |
| Lush & Pure Ltd | Wholesale & retail | 2025 |
| Lushland Limited | Agriculture & fishing | 2001 |
| Lusinski Limited | Real estate | 2018 |
| Lutiumplus Ltd | Wholesale & retail | 2018 |
| LUX Education Ltd | Education | 2017 |
| Luxe Asia Limited | Professional & scientific | 2023 |
| Luxe Events & Hire Ltd | Hospitality | 2022 |
| Luxe Oils Ltd | Manufacturing | 2024 |
| Luxury Apple Lettings Ltd | Real estate | 2023 |
| Luxury Nails 44 Ltd | Other services | 2023 |
| LVL UP Driver Services Ltd | Transport & logistics | 2026 |
| Lvss Ltd | Professional & scientific | 2026 |
| LXD Group (Holdings) Limited | Manufacturing | 2024 |
| LY Capital Properties Ltd | Real estate | 2025 |
| Lydford Farm Limited | Real estate | 2010 |
| LYM Consulting Limited | Professional & scientific | 2025 |
| LYNCH4 Capital Holdings Ltd | Financial services | 2026 |
| LYNCH4 Care Services Limited | Health & social care | 2018 |
| Lynxen Enterprises Ltd | Professional & scientific | 2024 |
| M & S Traffic Limited | Professional & scientific | 2008 |
| M Chapmans Surfacing Limited | Construction | 2018 |
| M J Equine Ltd | Wholesale & retail | 2010 |
| M J O Mechanicals Ltd | Construction | 2010 |
| M Tewes Trading AS MT Electrical Limited | Construction | 2018 |
| M&Ch Ltd | Construction | 2025 |
| M&D Tailoring Ltd | Other services | 2026 |
| M&J Fire Solutions Ltd | Construction | 2025 |
| M-Tech (Dorset) Limited | Wholesale & retail | 2014 |
| M. Ayling & Sons Limited | Construction | 2003 |
| M.E.W Supplies Limited | Extraterritorial | 2008 |
| M3 Transport Services Ltd | Transport & logistics | 2026 |
| M3PROPERTIESMEDWAY Ltd | Real estate | 2025 |
| M4 Security Services Limited | Administrative & support | 2021 |
| Maaz Estore Limited | Wholesale & retail | 2025 |
| MAB Structural Engineers Ltd | Professional & scientific | 2021 |
| Mackenzie & Sons Automotive Ltd | Wholesale & retail | 2025 |
| Mackey & Co Limited | Professional & scientific | 2012 |
| Maco Solutions Ltd | Construction | 2018 |
| Maddan Developments Limited | Financial services | 2025 |
| Maddan One One Ltd | Financial services | 2025 |
| Maddan One Two Ltd | Real estate | 2026 |
| Madjeston Animal Park Limited | Arts & recreation | 2025 |
| Madjeston Roofing Limited | Construction | 2011 |
| Madrid Investments Ltd | Wholesale & retail | 2020 |
| Mafhh Security Limited | Administrative & support | 2021 |
| Magic Blade Barbers Ltd | Other services | 2025 |
| Maid on a Mission Cleaning Services Ltd | Administrative & support | 2024 |
| Maie Aesthetics Limited | Other services | 2023 |
| Maie Ultrasound Ltd | Health & social care | 2023 |
| Maigew Trading Co., Ltd | Manufacturing | 2023 |
| Maintenance and Development Solutions Ltd | Construction | 2014 |
| Maison Primrose Property Ltd | Real estate | 2025 |
| Maitreyfull Ltd | Wholesale & retail | 2023 |
| Majic (South East) LLP | | 2005 |
| Major Crew Call Ltd | Arts & recreation | 2025 |
| MAK Foods LDN Ltd | Hospitality | 2023 |
| Make One UP Ltd | Other services | 2017 |
| Maks Pharmacy Limited | Wholesale & retail | 2003 |
| Maksville Limited | Construction | 2020 |
| Malleson Farming Limited | Agriculture & fishing | 2014 |
| Malvern Freight Management Ltd | Transport & logistics | 2024 |
| Mammoth Studios Ltd | Information & communication | 2025 |
| Mamo Music Limited | Arts & recreation | 2025 |
| Management Over Matter Ltd | Professional & scientific | 2017 |
| Mancanoy Limited | Wholesale & retail | 2025 |
| Manderson Electrical Services Limited | Construction | 2017 |
| Manivannan Properties Ltd | Real estate | 2017 |
| Mannerings Brickwork Limited | Construction | 2010 |
| Manor Apartments CT20 Limited | Real estate | 2020 |
| Manor Farm Super Hand Car Wash Ltd | Administrative & support | 2025 |
| Manor Farm West Stour Limited | Households | 2004 |
| Manostore Ltd | Wholesale & retail | 2025 |
| Manston Homes 2017 Limited | Households | 2017 |
| Mantiis Limited | Wholesale & retail | 2018 |
| Mantlet Secure Ltd | Other services | 2021 |
| Manzlinks Ltd | Health & social care | 2021 |
| Maple Wood Management Company (Maidstone) Limited | Households | 2003 |
| Maplerock Property Solutions Limited | Other services | 2019 |
| Marc Three Accountancy Limited | Professional & scientific | 2017 |
| Marc Three Limited | Professional & scientific | 2009 |
| Marcin Mroczko Limited | Transport & logistics | 2023 |
| Marco Santos Ltd | Administrative & support | 2016 |
| Mardean Mechanical Services Limited | Manufacturing | 2013 |
| Maria Sent BON Ltd | Manufacturing | 2026 |